Adding upstream version 115.7.0esr.upstream/115.7.0esrupstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 8666 insertions, 0 deletions

diff --git a/gfx/angle/checkout/src/libANGLE/validationES.cpp b/gfx/angle/checkout/src/libANGLE/validationES.cpp
new file mode 100644
index 0000000000..ddc586b1ad
--- /dev/null
+++ b/gfx/angle/checkout/src/libANGLE/validationES.cpp
@@ -0,0 +1,8666 @@
+//
+// Copyright 2013 The ANGLE Project Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+//
+
+// validationES.h: Validation functions for generic OpenGL ES entry point parameters
+
+#include "libANGLE/validationES.h"
+
+#include "libANGLE/Context.h"
+#include "libANGLE/Display.h"
+#include "libANGLE/ErrorStrings.h"
+#include "libANGLE/Framebuffer.h"
+#include "libANGLE/FramebufferAttachment.h"
+#include "libANGLE/Image.h"
+#include "libANGLE/Program.h"
+#include "libANGLE/Query.h"
+#include "libANGLE/Texture.h"
+#include "libANGLE/TransformFeedback.h"
+#include "libANGLE/angletypes.h"
+#include "libANGLE/formatutils.h"
+#include "libANGLE/queryconversions.h"
+#include "libANGLE/queryutils.h"
+#include "libANGLE/validationES2.h"
+#include "libANGLE/validationES3.h"
+
+#include "common/mathutil.h"
+#include "common/utilities.h"
+
+using namespace angle;
+
+namespace gl
+{
+using namespace err;
+
+namespace
+{
+bool CompressedTextureFormatRequiresExactSize(GLenum internalFormat)
+{
+    // List of compressed format that require that the texture size is smaller than or a multiple of
+    // the compressed block size.
+    switch (internalFormat)
+    {
+        case GL_COMPRESSED_RGB_S3TC_DXT1_EXT:
+        case GL_COMPRESSED_RGBA_S3TC_DXT1_EXT:
+        case GL_COMPRESSED_RGBA_S3TC_DXT3_ANGLE:
+        case GL_COMPRESSED_RGBA_S3TC_DXT5_ANGLE:
+        case GL_COMPRESSED_SRGB_S3TC_DXT1_EXT:
+        case GL_COMPRESSED_SRGB_ALPHA_S3TC_DXT1_EXT:
+        case GL_COMPRESSED_SRGB_ALPHA_S3TC_DXT3_EXT:
+        case GL_COMPRESSED_SRGB_ALPHA_S3TC_DXT5_EXT:
+        case GL_ETC1_RGB8_LOSSY_DECODE_ANGLE:
+        case GL_COMPRESSED_RGB8_LOSSY_DECODE_ETC2_ANGLE:
+        case GL_COMPRESSED_SRGB8_LOSSY_DECODE_ETC2_ANGLE:
+        case GL_COMPRESSED_RGB8_PUNCHTHROUGH_ALPHA1_LOSSY_DECODE_ETC2_ANGLE:
+        case GL_COMPRESSED_SRGB8_PUNCHTHROUGH_ALPHA1_LOSSY_DECODE_ETC2_ANGLE:
+        case GL_COMPRESSED_RGBA8_LOSSY_DECODE_ETC2_EAC_ANGLE:
+        case GL_COMPRESSED_SRGB8_ALPHA8_LOSSY_DECODE_ETC2_EAC_ANGLE:
+        case GL_COMPRESSED_RED_RGTC1_EXT:
+        case GL_COMPRESSED_SIGNED_RED_RGTC1_EXT:
+        case GL_COMPRESSED_RED_GREEN_RGTC2_EXT:
+        case GL_COMPRESSED_SIGNED_RED_GREEN_RGTC2_EXT:
+        case GL_COMPRESSED_RGBA_BPTC_UNORM_EXT:
+        case GL_COMPRESSED_SRGB_ALPHA_BPTC_UNORM_EXT:
+        case GL_COMPRESSED_RGB_BPTC_SIGNED_FLOAT_EXT:
+        case GL_COMPRESSED_RGB_BPTC_UNSIGNED_FLOAT_EXT:
+            return true;
+
+        default:
+            return false;
+    }
+}
+bool CompressedSubTextureFormatRequiresExactSize(GLenum internalFormat)
+{
+    // Compressed sub textures have additional formats that requires exact size.
+    // ES 3.1, Section 8.7, Page 171
+    return CompressedTextureFormatRequiresExactSize(internalFormat) ||
+           IsETC2EACFormat(internalFormat) || IsASTC2DFormat(internalFormat);
+}
+
+bool DifferenceCanOverflow(GLint a, GLint b)
+{
+    CheckedNumeric<GLint> checkedA(a);
+    checkedA -= b;
+    // Use negation to make sure that the difference can't overflow regardless of the order.
+    checkedA = -checkedA;
+    return !checkedA.IsValid();
+}
+
+bool ValidReadPixelsTypeEnum(const Context *context, GLenum type)
+{
+    switch (type)
+    {
+        // Types referenced in Table 3.4 of the ES 2.0.25 spec
+        case GL_UNSIGNED_BYTE:
+        case GL_UNSIGNED_SHORT_4_4_4_4:
+        case GL_UNSIGNED_SHORT_5_5_5_1:
+        case GL_UNSIGNED_SHORT_5_6_5:
+            return context->getClientVersion() >= ES_2_0;
+
+        // Types referenced in Table 3.2 of the ES 3.0.5 spec (Except depth stencil)
+        case GL_BYTE:
+        case GL_INT:
+        case GL_SHORT:
+        case GL_UNSIGNED_INT:
+        case GL_UNSIGNED_INT_10F_11F_11F_REV:
+        case GL_UNSIGNED_INT_2_10_10_10_REV:
+        case GL_UNSIGNED_INT_5_9_9_9_REV:
+        case GL_UNSIGNED_SHORT:
+        case GL_UNSIGNED_SHORT_1_5_5_5_REV_EXT:
+        case GL_UNSIGNED_SHORT_4_4_4_4_REV_EXT:
+            return context->getClientVersion() >= ES_3_0;
+
+        case GL_FLOAT:
+            return context->getClientVersion() >= ES_3_0 ||
+                   context->getExtensions().textureFloatOES ||
+                   context->getExtensions().colorBufferHalfFloatEXT;
+
+        case GL_HALF_FLOAT:
+            return context->getClientVersion() >= ES_3_0 ||
+                   context->getExtensions().textureHalfFloatOES;
+
+        case GL_HALF_FLOAT_OES:
+            return context->getExtensions().colorBufferHalfFloatEXT;
+
+        default:
+            return false;
+    }
+}
+
+bool ValidReadPixelsFormatEnum(const Context *context, GLenum format)
+{
+    switch (format)
+    {
+        // Formats referenced in Table 3.4 of the ES 2.0.25 spec (Except luminance)
+        case GL_RGBA:
+        case GL_RGB:
+        case GL_ALPHA:
+            return context->getClientVersion() >= ES_2_0;
+
+        // Formats referenced in Table 3.2 of the ES 3.0.5 spec
+        case GL_RG:
+        case GL_RED:
+        case GL_RGBA_INTEGER:
+        case GL_RGB_INTEGER:
+        case GL_RG_INTEGER:
+        case GL_RED_INTEGER:
+            return context->getClientVersion() >= ES_3_0;
+
+        case GL_SRGB_ALPHA_EXT:
+        case GL_SRGB_EXT:
+            return context->getExtensions().sRGBEXT;
+
+        case GL_BGRA_EXT:
+            return context->getExtensions().readFormatBgraEXT;
+
+        case GL_RGBX8_ANGLE:
+            return context->getExtensions().rgbxInternalFormatANGLE;
+
+        default:
+            return false;
+    }
+}
+
+bool ValidReadPixelsUnsignedNormalizedDepthType(const Context *context,
+                                                const gl::InternalFormat *info,
+                                                GLenum type)
+{
+    bool supportsReadDepthNV = context->getExtensions().readDepthNV && (info->depthBits > 0);
+    switch (type)
+    {
+        case GL_UNSIGNED_SHORT:
+        case GL_UNSIGNED_INT:
+        case GL_UNSIGNED_INT_24_8:
+            return supportsReadDepthNV;
+        default:
+            return false;
+    }
+}
+
+bool ValidReadPixelsFloatDepthType(const Context *context,
+                                   const gl::InternalFormat *info,
+                                   GLenum type)
+{
+    return context->getExtensions().readDepthNV && (type == GL_FLOAT) &&
+           context->getExtensions().depthBufferFloat2NV;
+}
+
+bool ValidReadPixelsFormatType(const Context *context,
+                               const gl::InternalFormat *info,
+                               GLenum format,
+                               GLenum type)
+{
+    switch (info->componentType)
+    {
+        case GL_UNSIGNED_NORMALIZED:
+            // TODO(geofflang): Don't accept BGRA here.  Some chrome internals appear to try to use
+            // ReadPixels with BGRA even if the extension is not present
+            switch (format)
+            {
+                case GL_RGBA:
+                    return ((type == GL_UNSIGNED_BYTE) && info->pixelBytes >= 1) ||
+                           (context->getExtensions().textureNorm16EXT &&
+                            (type == GL_UNSIGNED_SHORT) && info->pixelBytes >= 2);
+                case GL_BGRA_EXT:
+                    return context->getExtensions().readFormatBgraEXT && (type == GL_UNSIGNED_BYTE);
+                case GL_STENCIL_INDEX_OES:
+                    return context->getExtensions().readStencilNV && (type == GL_UNSIGNED_BYTE);
+                case GL_DEPTH_COMPONENT:
+                    return ValidReadPixelsUnsignedNormalizedDepthType(context, info, type);
+                case GL_DEPTH_STENCIL_OES:
+                    return context->getExtensions().readDepthStencilNV &&
+                           (type == GL_UNSIGNED_INT_24_8_OES) && info->stencilBits > 0;
+                case GL_RGBX8_ANGLE:
+                    return context->getExtensions().rgbxInternalFormatANGLE &&
+                           (type == GL_UNSIGNED_BYTE);
+                default:
+                    return false;
+            }
+        case GL_SIGNED_NORMALIZED:
+            return (format == GL_RGBA && type == GL_BYTE && info->pixelBytes >= 1) ||
+                   (context->getExtensions().textureNorm16EXT && format == GL_RGBA &&
+                    type == GL_UNSIGNED_SHORT && info->pixelBytes >= 2);
+
+        case GL_INT:
+            return (format == GL_RGBA_INTEGER && type == GL_INT);
+
+        case GL_UNSIGNED_INT:
+            return (format == GL_RGBA_INTEGER && type == GL_UNSIGNED_INT);
+
+        case GL_FLOAT:
+            switch (format)
+            {
+                case GL_RGBA:
+                    return (type == GL_FLOAT);
+                case GL_DEPTH_COMPONENT:
+                    return ValidReadPixelsFloatDepthType(context, info, type);
+                case GL_DEPTH_STENCIL_OES:
+                    return context->getExtensions().readDepthStencilNV &&
+                           type == GL_FLOAT_32_UNSIGNED_INT_24_8_REV && info->stencilBits > 0;
+                default:
+                    return false;
+            }
+        default:
+            UNREACHABLE();
+            return false;
+    }
+}
+
+template <typename ParamType>
+bool ValidateTextureWrapModeValue(const Context *context,
+                                  angle::EntryPoint entryPoint,
+                                  const ParamType *params,
+                                  bool restrictedWrapModes)
+{
+    switch (ConvertToGLenum(params[0]))
+    {
+        case GL_CLAMP_TO_EDGE:
+            break;
+
+        case GL_CLAMP_TO_BORDER:
+            if (!context->getExtensions().textureBorderClampAny() &&
+                context->getClientVersion() < ES_3_2)
+            {
+                context->validationError(entryPoint, GL_INVALID_ENUM, kExtensionNotEnabled);
+                return false;
+            }
+            break;
+
+        case GL_REPEAT:
+        case GL_MIRRORED_REPEAT:
+            if (restrictedWrapModes)
+            {
+                // OES_EGL_image_external and ANGLE_texture_rectangle specifies this error.
+                context->validationError(entryPoint, GL_INVALID_ENUM, kInvalidWrapModeTexture);
+                return false;
+            }
+            break;
+
+        default:
+            context->validationError(entryPoint, GL_INVALID_ENUM, kInvalidTextureWrap);
+            return false;
+    }
+
+    return true;
+}
+
+template <typename ParamType>
+bool ValidateTextureMinFilterValue(const Context *context,
+                                   angle::EntryPoint entryPoint,
+                                   const ParamType *params,
+                                   bool restrictedMinFilter)
+{
+    switch (ConvertToGLenum(params[0]))
+    {
+        case GL_NEAREST:
+        case GL_LINEAR:
+            break;
+
+        case GL_NEAREST_MIPMAP_NEAREST:
+        case GL_LINEAR_MIPMAP_NEAREST:
+        case GL_NEAREST_MIPMAP_LINEAR:
+        case GL_LINEAR_MIPMAP_LINEAR:
+            if (restrictedMinFilter)
+            {
+                // OES_EGL_image_external specifies this error.
+                context->validationError(entryPoint, GL_INVALID_ENUM, kInvalidFilterTexture);
+                return false;
+            }
+            break;
+
+        default:
+            context->validationError(entryPoint, GL_INVALID_ENUM, kInvalidTextureFilterParam);
+            return false;
+    }
+
+    return true;
+}
+
+template <typename ParamType>
+bool ValidateTextureMagFilterValue(const Context *context,
+                                   angle::EntryPoint entryPoint,
+                                   const ParamType *params)
+{
+    switch (ConvertToGLenum(params[0]))
+    {
+        case GL_NEAREST:
+        case GL_LINEAR:
+            break;
+
+        default:
+            context->validationError(entryPoint, GL_INVALID_ENUM, kInvalidTextureFilterParam);
+            return false;
+    }
+
+    return true;
+}
+
+template <typename ParamType>
+bool ValidateTextureCompareModeValue(const Context *context,
+                                     angle::EntryPoint entryPoint,
+                                     const ParamType *params)
+{
+    // Acceptable mode parameters from GLES 3.0.2 spec, table 3.17
+    switch (ConvertToGLenum(params[0]))
+    {
+        case GL_NONE:
+        case GL_COMPARE_REF_TO_TEXTURE:
+            break;
+
+        default:
+            context->validationError(entryPoint, GL_INVALID_ENUM, kUnknownParameter);
+            return false;
+    }
+
+    return true;
+}
+
+template <typename ParamType>
+bool ValidateTextureCompareFuncValue(const Context *context,
+                                     angle::EntryPoint entryPoint,
+                                     const ParamType *params)
+{
+    // Acceptable function parameters from GLES 3.0.2 spec, table 3.17
+    switch (ConvertToGLenum(params[0]))
+    {
+        case GL_LEQUAL:
+        case GL_GEQUAL:
+        case GL_LESS:
+        case GL_GREATER:
+        case GL_EQUAL:
+        case GL_NOTEQUAL:
+        case GL_ALWAYS:
+        case GL_NEVER:
+            break;
+
+        default:
+            context->validationError(entryPoint, GL_INVALID_ENUM, kUnknownParameter);
+            return false;
+    }
+
+    return true;
+}
+
+template <typename ParamType>
+bool ValidateTextureSRGBDecodeValue(const Context *context,
+                                    angle::EntryPoint entryPoint,
+                                    const ParamType *params)
+{
+    if (!context->getExtensions().textureSRGBDecodeEXT)
+    {
+        context->validationError(entryPoint, GL_INVALID_ENUM, kExtensionNotEnabled);
+        return false;
+    }
+
+    switch (ConvertToGLenum(params[0]))
+    {
+        case GL_DECODE_EXT:
+        case GL_SKIP_DECODE_EXT:
+            break;
+
+        default:
+            context->validationError(entryPoint, GL_INVALID_ENUM, kUnknownParameter);
+            return false;
+    }
+
+    return true;
+}
+
+template <typename ParamType>
+bool ValidateTextureSRGBOverrideValue(const Context *context,
+                                      angle::EntryPoint entryPoint,
+                                      const ParamType *params)
+{
+    if (!context->getExtensions().textureFormatSRGBOverrideEXT)
+    {
+        context->validationError(entryPoint, GL_INVALID_ENUM, kExtensionNotEnabled);
+        return false;
+    }
+
+    switch (ConvertToGLenum(params[0]))
+    {
+        case GL_SRGB:
+        case GL_NONE:
+            break;
+
+        default:
+            context->validationError(entryPoint, GL_INVALID_ENUM, kUnknownParameter);
+            return false;
+    }
+
+    return true;
+}
+
+bool ValidateTextureMaxAnisotropyExtensionEnabled(const Context *context,
+                                                  angle::EntryPoint entryPoint)
+{
+    if (!context->getExtensions().textureFilterAnisotropicEXT)
+    {
+        context->validationError(entryPoint, GL_INVALID_ENUM, kExtensionNotEnabled);
+        return false;
+    }
+
+    return true;
+}
+
+bool ValidateTextureMaxAnisotropyValue(const Context *context,
+                                       angle::EntryPoint entryPoint,
+                                       GLfloat paramValue)
+{
+    if (!ValidateTextureMaxAnisotropyExtensionEnabled(context, entryPoint))
+    {
+        return false;
+    }
+
+    GLfloat largest = context->getCaps().maxTextureAnisotropy;
+
+    if (paramValue < 1 || paramValue > largest)
+    {
+        context->validationError(entryPoint, GL_INVALID_VALUE, kOutsideOfBounds);
+        return false;
+    }
+
+    return true;
+}
+
+bool ValidateFragmentShaderColorBufferMaskMatch(const Context *context)
+{
+    const auto &glState            = context->getState();
+    const Program *program         = context->getActiveLinkedProgram();
+    const Framebuffer *framebuffer = glState.getDrawFramebuffer();
+
+    auto drawBufferMask =
+        framebuffer->getDrawBufferMask() & glState.getBlendStateExt().compareColorMask(0);
+    auto fragmentOutputMask = program->getExecutable().getActiveOutputVariablesMask();
+
+    return drawBufferMask == (drawBufferMask & fragmentOutputMask);
+}
+
+bool ValidateFragmentShaderColorBufferTypeMatch(const Context *context)
+{
+    const ProgramExecutable *executable = context->getState().getLinkedProgramExecutable(context);
+    const Framebuffer *framebuffer      = context->getState().getDrawFramebuffer();
+
+    return ValidateComponentTypeMasks(executable->getFragmentOutputsTypeMask().to_ulong(),
+                                      framebuffer->getDrawBufferTypeMask().to_ulong(),
+                                      executable->getActiveOutputVariablesMask().to_ulong(),
+                                      framebuffer->getDrawBufferMask().to_ulong());
+}
+
+bool ValidateVertexShaderAttributeTypeMatch(const Context *context)
+{
+    const auto &glState    = context->getState();
+    const Program *program = context->getActiveLinkedProgram();
+    const VertexArray *vao = context->getState().getVertexArray();
+
+    if (!program)
+    {
+        return false;
+    }
+
+    unsigned long stateCurrentValuesTypeBits = glState.getCurrentValuesTypeMask().to_ulong();
+    unsigned long vaoAttribTypeBits          = vao->getAttributesTypeMask().to_ulong();
+    unsigned long vaoAttribEnabledMask       = vao->getAttributesMask().to_ulong();
+
+    vaoAttribEnabledMask |= vaoAttribEnabledMask << kMaxComponentTypeMaskIndex;
+    vaoAttribTypeBits = (vaoAttribEnabledMask & vaoAttribTypeBits);
+    vaoAttribTypeBits |= (~vaoAttribEnabledMask & stateCurrentValuesTypeBits);
+
+    const ProgramExecutable &executable = program->getExecutable();
+    return ValidateComponentTypeMasks(executable.getAttributesTypeMask().to_ulong(),
+                                      vaoAttribTypeBits, executable.getAttributesMask().to_ulong(),
+                                      0xFFFF);
+}
+
+bool IsCompatibleDrawModeWithGeometryShader(PrimitiveMode drawMode,
+                                            PrimitiveMode geometryShaderInputPrimitiveType)
+{
+    // [EXT_geometry_shader] Section 11.1gs.1, Geometry Shader Input Primitives
+    switch (drawMode)
+    {
+        case PrimitiveMode::Points:
+            return geometryShaderInputPrimitiveType == PrimitiveMode::Points;
+        case PrimitiveMode::Lines:
+        case PrimitiveMode::LineStrip:
+        case PrimitiveMode::LineLoop:
+            return geometryShaderInputPrimitiveType == PrimitiveMode::Lines;
+        case PrimitiveMode::LinesAdjacency:
+        case PrimitiveMode::LineStripAdjacency:
+            return geometryShaderInputPrimitiveType == PrimitiveMode::LinesAdjacency;
+        case PrimitiveMode::Triangles:
+        case PrimitiveMode::TriangleFan:
+        case PrimitiveMode::TriangleStrip:
+            return geometryShaderInputPrimitiveType == PrimitiveMode::Triangles;
+        case PrimitiveMode::TrianglesAdjacency:
+        case PrimitiveMode::TriangleStripAdjacency:
+            return geometryShaderInputPrimitiveType == PrimitiveMode::TrianglesAdjacency;
+        default:
+            UNREACHABLE();
+            return false;
+    }
+}
+
+// GLES1 texture parameters are a small subset of the others
+bool IsValidGLES1TextureParameter(GLenum pname)
+{
+    switch (pname)
+    {
+        case GL_TEXTURE_MAG_FILTER:
+        case GL_TEXTURE_MIN_FILTER:
+        case GL_TEXTURE_WRAP_S:
+        case GL_TEXTURE_WRAP_T:
+        case GL_TEXTURE_WRAP_R:
+        case GL_GENERATE_MIPMAP:
+        case GL_TEXTURE_CROP_RECT_OES:
+            return true;
+        default:
+            return false;
+    }
+}
+
+unsigned int GetSamplerParameterCount(GLenum pname)
+{
+    return pname == GL_TEXTURE_BORDER_COLOR ? 4 : 1;
+}
+
+const char *ValidateProgramDrawAdvancedBlendState(const Context *context, Program *program)
+{
+    const State &state = context->getState();
+    const BlendEquationBitSet &supportedBlendEquations =
+        program->getExecutable().getAdvancedBlendEquations();
+    const DrawBufferMask &enabledDrawBufferMask = state.getBlendStateExt().getEnabledMask();
+
+    for (size_t blendEnabledBufferIndex : enabledDrawBufferMask)
+    {
+        const gl::BlendEquationType &enabledBlendEquation = gl::FromGLenum<gl::BlendEquationType>(
+            state.getBlendStateExt().getEquationColorIndexed(blendEnabledBufferIndex));
+
+        if (enabledBlendEquation < gl::BlendEquationType::Multiply ||
+            enabledBlendEquation > gl::BlendEquationType::HslLuminosity)
+        {
+            continue;
+        }
+
+        if (!supportedBlendEquations.test(enabledBlendEquation))
+        {
+            return gl::err::kBlendEquationNotEnabled;
+        }
+    }
+
+    return nullptr;
+}
+
+ANGLE_INLINE const char *ValidateProgramDrawStates(const Context *context,
+                                                   const Extensions &extensions,
+                                                   Program *program)
+{
+    const State &state = context->getState();
+    if (extensions.multiviewOVR || extensions.multiview2OVR)
+    {
+        const int programNumViews     = program->usesMultiview() ? program->getNumViews() : 1;
+        Framebuffer *framebuffer      = state.getDrawFramebuffer();
+        const int framebufferNumViews = framebuffer->getNumViews();
+
+        if (framebufferNumViews != programNumViews)
+        {
+            return gl::err::kMultiviewMismatch;
+        }
+
+        if (state.isTransformFeedbackActiveUnpaused() && framebufferNumViews > 1)
+        {
+            return gl::err::kMultiviewTransformFeedback;
+        }
+
+        if (extensions.disjointTimerQueryEXT && framebufferNumViews > 1 &&
+            state.isQueryActive(QueryType::TimeElapsed))
+        {
+            return gl::err::kMultiviewTimerQuery;
+        }
+    }
+
+    // Uniform buffer validation
+    for (unsigned int uniformBlockIndex = 0;
+         uniformBlockIndex < program->getActiveUniformBlockCount(); uniformBlockIndex++)
+    {
+        const InterfaceBlock &uniformBlock = program->getUniformBlockByIndex(uniformBlockIndex);
+        GLuint blockBinding                = program->getUniformBlockBinding(uniformBlockIndex);
+        const OffsetBindingPointer<Buffer> &uniformBuffer =
+            state.getIndexedUniformBuffer(blockBinding);
+
+        if (uniformBuffer.get() == nullptr && context->isWebGL())
+        {
+            // undefined behaviour
+            return gl::err::kUniformBufferUnbound;
+        }
+
+        size_t uniformBufferSize = GetBoundBufferAvailableSize(uniformBuffer);
+        if (uniformBufferSize < uniformBlock.dataSize &&
+            (context->isWebGL() || context->isBufferAccessValidationEnabled()))
+        {
+            // undefined behaviour
+            return gl::err::kUniformBufferTooSmall;
+        }
+
+        if (uniformBuffer->hasWebGLXFBBindingConflict(context->isWebGL()))
+        {
+            return gl::err::kUniformBufferBoundForTransformFeedback;
+        }
+    }
+
+    // Enabled blend equation validation
+    const char *errorString = nullptr;
+
+    if (extensions.blendEquationAdvancedKHR)
+    {
+        errorString = ValidateProgramDrawAdvancedBlendState(context, program);
+    }
+
+    return errorString;
+}
+}  // anonymous namespace
+
+void SetRobustLengthParam(const GLsizei *length, GLsizei value)
+{
+    if (length)
+    {
+        // Currently we modify robust length parameters in the validation layer. We should be only
+        // doing this in the Context instead.
+        // TODO(http://anglebug.com/4406): Remove when possible.
+        *const_cast<GLsizei *>(length) = value;
+    }
+}
+
+bool ValidTextureTarget(const Context *context, TextureType type)
+{
+    switch (type)
+    {
+        case TextureType::_2D:
+        case TextureType::CubeMap:
+            return true;
+
+        case TextureType::Rectangle:
+            return context->getExtensions().textureRectangleANGLE;
+
+        case TextureType::_3D:
+            return ((context->getClientMajorVersion() >= 3) ||
+                    context->getExtensions().texture3DOES);
+
+        case TextureType::_2DArray:
+            return (context->getClientMajorVersion() >= 3);
+
+        case TextureType::_2DMultisample:
+            return (context->getClientVersion() >= Version(3, 1) ||
+                    context->getExtensions().textureMultisampleANGLE);
+        case TextureType::_2DMultisampleArray:
+            return context->getExtensions().textureStorageMultisample2dArrayOES;
+
+        case TextureType::CubeMapArray:
+            return (context->getClientVersion() >= Version(3, 2) ||
+                    context->getExtensions().textureCubeMapArrayAny());
+
+        case TextureType::VideoImage:
+            return context->getExtensions().videoTextureWEBGL;
+
+        case TextureType::Buffer:
+            return (context->getClientVersion() >= Version(3, 2) ||
+                    context->getExtensions().textureBufferAny());
+
+        default:
+            return false;
+    }
+}
+
+bool ValidTexture2DTarget(const Context *context, TextureType type)
+{
+    switch (type)
+    {
+        case TextureType::_2D:
+        case TextureType::CubeMap:
+            return true;
+
+        case TextureType::Rectangle:
+            return context->getExtensions().textureRectangleANGLE;
+
+        default:
+            return false;
+    }
+}
+
+bool ValidTexture3DTarget(const Context *context, TextureType target)
+{
+    switch (target)
+    {
+        case TextureType::_3D:
+        case TextureType::_2DArray:
+            return (context->getClientMajorVersion() >= 3);
+
+        case TextureType::CubeMapArray:
+            return (context->getClientVersion() >= Version(3, 2) ||
+                    context->getExtensions().textureCubeMapArrayAny());
+
+        default:
+            return false;
+    }
+}
+
+// Most texture GL calls are not compatible with external textures, so we have a separate validation
+// function for use in the GL calls that do
+bool ValidTextureExternalTarget(const Context *context, TextureType target)
+{
+    return (target == TextureType::External) &&
+           (context->getExtensions().EGLImageExternalOES ||
+            context->getExtensions().EGLStreamConsumerExternalNV);
+}
+
+bool ValidTextureExternalTarget(const Context *context, TextureTarget target)
+{
+    return (target == TextureTarget::External) &&
+           ValidTextureExternalTarget(context, TextureType::External);
+}
+
+// This function differs from ValidTextureTarget in that the target must be
+// usable as the destination of a 2D operation-- so a cube face is valid, but
+// GL_TEXTURE_CUBE_MAP is not.
+// Note: duplicate of IsInternalTextureTarget
+bool ValidTexture2DDestinationTarget(const Context *context, TextureTarget target)
+{
+    switch (target)
+    {
+        case TextureTarget::_2D:
+        case TextureTarget::CubeMapNegativeX:
+        case TextureTarget::CubeMapNegativeY:
+        case TextureTarget::CubeMapNegativeZ:
+        case TextureTarget::CubeMapPositiveX:
+        case TextureTarget::CubeMapPositiveY:
+        case TextureTarget::CubeMapPositiveZ:
+            return true;
+        case TextureTarget::Rectangle:
+            return context->getExtensions().textureRectangleANGLE;
+        case TextureTarget::VideoImage:
+            return context->getExtensions().videoTextureWEBGL;
+        default:
+            return false;
+    }
+}
+
+bool ValidateTransformFeedbackPrimitiveMode(const Context *context,
+                                            angle::EntryPoint entryPoint,
+                                            PrimitiveMode transformFeedbackPrimitiveMode,
+                                            PrimitiveMode renderPrimitiveMode)
+{
+    ASSERT(context);
+
+    if ((!context->getExtensions().geometryShaderAny() ||
+         !context->getExtensions().tessellationShaderEXT) &&
+        context->getClientVersion() < ES_3_2)
+    {
+        // It is an invalid operation to call DrawArrays or DrawArraysInstanced with a draw mode
+        // that does not match the current transform feedback object's draw mode (if transform
+        // feedback is active), (3.0.2, section 2.14, pg 86)
+        return transformFeedbackPrimitiveMode == renderPrimitiveMode;
+    }
+
+    const ProgramExecutable *executable = context->getState().getLinkedProgramExecutable(context);
+    ASSERT(executable);
+    if (executable->hasLinkedShaderStage(ShaderType::Geometry))
+    {
+        // If geometry shader is active, transform feedback mode must match what is output from this
+        // stage.
+        renderPrimitiveMode = executable->getGeometryShaderOutputPrimitiveType();
+    }
+    else if (executable->hasLinkedShaderStage(ShaderType::TessEvaluation))
+    {
+        // Similarly with tessellation shaders, but only if no geometry shader is present.  With
+        // tessellation shaders, only triangles are possibly output.
+        return transformFeedbackPrimitiveMode == PrimitiveMode::Triangles &&
+               executable->getTessGenMode() == GL_TRIANGLES;
+    }
+
+    // [GL_EXT_geometry_shader] Table 12.1gs
+    switch (renderPrimitiveMode)
+    {
+        case PrimitiveMode::Points:
+            return transformFeedbackPrimitiveMode == PrimitiveMode::Points;
+        case PrimitiveMode::Lines:
+        case PrimitiveMode::LineStrip:
+        case PrimitiveMode::LineLoop:
+            return transformFeedbackPrimitiveMode == PrimitiveMode::Lines;
+        case PrimitiveMode::Triangles:
+        case PrimitiveMode::TriangleFan:
+        case PrimitiveMode::TriangleStrip:
+            return transformFeedbackPrimitiveMode == PrimitiveMode::Triangles;
+        case PrimitiveMode::Patches:
+            return transformFeedbackPrimitiveMode == PrimitiveMode::Patches;
+        default:
+            UNREACHABLE();
+            return false;
+    }
+}
+
+bool ValidateDrawElementsInstancedBase(const Context *context,
+                                       angle::EntryPoint entryPoint,
+                                       PrimitiveMode mode,
+                                       GLsizei count,
+                                       DrawElementsType type,
+                                       const void *indices,
+                                       GLsizei primcount)
+{
+    if (primcount <= 0)
+    {
+        if (primcount < 0)
+        {
+            context->validationError(entryPoint, GL_INVALID_VALUE, kNegativePrimcount);
+            return false;
+        }
+
+        // Early exit.
+        return ValidateDrawElementsCommon(context, entryPoint, mode, count, type, indices,
+                                          primcount);
+    }
+
+    if (!ValidateDrawElementsCommon(context, entryPoint, mode, count, type, indices, primcount))
+    {
+        return false;
+    }
+
+    if (count == 0)
+    {
+        // Early exit.
+        return true;
+    }
+
+    return ValidateDrawInstancedAttribs(context, entryPoint, primcount);
+}
+
+bool ValidateDrawArraysInstancedBase(const Context *context,
+                                     angle::EntryPoint entryPoint,
+                                     PrimitiveMode mode,
+                                     GLint first,
+                                     GLsizei count,
+                                     GLsizei primcount)
+{
+    if (primcount <= 0)
+    {
+        if (primcount < 0)
+        {
+            context->validationError(entryPoint, GL_INVALID_VALUE, kNegativePrimcount);
+            return false;
+        }
+
+        // Early exit.
+        return ValidateDrawArraysCommon(context, entryPoint, mode, first, count, primcount);
+    }
+
+    if (!ValidateDrawArraysCommon(context, entryPoint, mode, first, count, primcount))
+    {
+        return false;
+    }
+
+    if (count == 0)
+    {
+        // Early exit.
+        return true;
+    }
+
+    return ValidateDrawInstancedAttribs(context, entryPoint, primcount);
+}
+
+bool ValidateDrawInstancedANGLE(const Context *context, angle::EntryPoint entryPoint)
+{
+    // Verify there is at least one active attribute with a divisor of zero
+    const State &state                  = context->getState();
+    const ProgramExecutable *executable = state.getLinkedProgramExecutable(context);
+
+    if (!executable)
+    {
+        // No executable means there is no Program/PPO bound, which is undefined behavior, but isn't
+        // an error.
+        context->getState().getDebug().insertMessage(
+            GL_DEBUG_SOURCE_API, GL_DEBUG_TYPE_UNDEFINED_BEHAVIOR, 0, GL_DEBUG_SEVERITY_HIGH,
+            std::string("Attempting to draw without a program"), gl::LOG_WARN, entryPoint);
+        return true;
+    }
+
+    const auto &attribs  = state.getVertexArray()->getVertexAttributes();
+    const auto &bindings = state.getVertexArray()->getVertexBindings();
+    for (size_t attributeIndex = 0; attributeIndex < attribs.size(); attributeIndex++)
+    {
+        const VertexAttribute &attrib = attribs[attributeIndex];
+        const VertexBinding &binding  = bindings[attrib.bindingIndex];
+        if (executable->isAttribLocationActive(attributeIndex) && binding.getDivisor() == 0)
+        {
+            return true;
+        }
+    }
+
+    context->validationError(entryPoint, GL_INVALID_OPERATION, kNoZeroDivisor);
+    return false;
+}
+
+bool ValidTexture3DDestinationTarget(const Context *context, TextureTarget target)
+{
+    switch (target)
+    {
+        case TextureTarget::_3D:
+        case TextureTarget::_2DArray:
+            return true;
+        case TextureTarget::CubeMapArray:
+            return (context->getClientVersion() >= Version(3, 2) ||
+                    context->getExtensions().textureCubeMapArrayAny());
+        default:
+            return false;
+    }
+}
+
+bool ValidTexLevelDestinationTarget(const Context *context, TextureType type)
+{
+    switch (type)
+    {
+        case TextureType::_2D:
+        case TextureType::_2DArray:
+        case TextureType::_2DMultisample:
+        case TextureType::CubeMap:
+        case TextureType::_3D:
+            return true;
+        case TextureType::CubeMapArray:
+            return (context->getClientVersion() >= Version(3, 2) ||
+                    context->getExtensions().textureCubeMapArrayAny());
+        case TextureType::Rectangle:
+            return context->getExtensions().textureRectangleANGLE;
+        case TextureType::_2DMultisampleArray:
+            return context->getExtensions().textureStorageMultisample2dArrayOES;
+        case TextureType::Buffer:
+            return (context->getClientVersion() >= Version(3, 2) ||
+                    context->getExtensions().textureBufferAny());
+        default:
+            return false;
+    }
+}
+
+bool ValidFramebufferTarget(const Context *context, GLenum target)
+{
+    static_assert(GL_DRAW_FRAMEBUFFER_ANGLE == GL_DRAW_FRAMEBUFFER &&
+                      GL_READ_FRAMEBUFFER_ANGLE == GL_READ_FRAMEBUFFER,
+                  "ANGLE framebuffer enums must equal the ES3 framebuffer enums.");
+
+    switch (target)
+    {
+        case GL_FRAMEBUFFER:
+            return true;
+
+        case GL_READ_FRAMEBUFFER:
+        case GL_DRAW_FRAMEBUFFER:
+            return (context->getExtensions().framebufferBlitAny() ||
+                    context->getClientMajorVersion() >= 3);
+
+        default:
+            return false;
+    }
+}
+
+bool ValidMipLevel(const Context *context, TextureType type, GLint level)
+{
+    const auto &caps = context->getCaps();
+    int maxDimension = 0;
+    switch (type)
+    {
+        case TextureType::_2D:
+        case TextureType::_2DArray:
+        case TextureType::_2DMultisample:
+        case TextureType::_2DMultisampleArray:
+            // TODO(http://anglebug.com/2775): It's a bit unclear what the "maximum allowable
+            // level-of-detail" for multisample textures should be. Could maybe make it zero.
+            maxDimension = caps.max2DTextureSize;
+            break;
+
+        case TextureType::CubeMap:
+        case TextureType::CubeMapArray:
+            maxDimension = caps.maxCubeMapTextureSize;
+            break;
+
+        case TextureType::External:
+        case TextureType::Rectangle:
+        case TextureType::VideoImage:
+        case TextureType::Buffer:
+            return level == 0;
+
+        case TextureType::_3D:
+            maxDimension = caps.max3DTextureSize;
+            break;
+
+        default:
+            UNREACHABLE();
+    }
+
+    return level <= log2(maxDimension) && level >= 0;
+}
+
+bool ValidImageSizeParameters(const Context *context,
+                              angle::EntryPoint entryPoint,
+                              TextureType target,
+                              GLint level,
+                              GLsizei width,
+                              GLsizei height,
+                              GLsizei depth,
+                              bool isSubImage)
+{
+    if (width < 0 || height < 0 || depth < 0)
+    {
+        context->validationError(entryPoint, GL_INVALID_VALUE, kNegativeSize);
+        return false;
+    }
+    // TexSubImage parameters can be NPOT without textureNPOT extension,
+    // as long as the destination texture is POT.
+    bool hasNPOTSupport =
+        context->getExtensions().textureNpotOES || context->getClientVersion() >= Version(3, 0);
+    if (!isSubImage && !hasNPOTSupport &&
+        (level != 0 && (!isPow2(width) || !isPow2(height) || !isPow2(depth))))
+    {
+        context->validationError(entryPoint, GL_INVALID_VALUE, kTextureNotPow2);
+        return false;
+    }
+
+    if (!ValidMipLevel(context, target, level))
+    {
+        context->validationError(entryPoint, GL_INVALID_VALUE, kInvalidMipLevel);
+        return false;
+    }
+
+    return true;
+}
+
+bool ValidCompressedBaseLevel(GLsizei size, GLuint blockSize, GLint level)
+{
+    // Already checked in ValidMipLevel.
+    ASSERT(level < 32);
+    // This function is used only for 4x4 BC formats.
+    ASSERT(blockSize == 4);
+    // Use the constant value to avoid division.
+    return ((size << level) % 4) == 0;
+}
+
+bool ValidCompressedImageSize(const Context *context,
+                              GLenum internalFormat,
+                              GLint level,
+                              GLsizei width,
+                              GLsizei height,
+                              GLsizei depth)
+{
+    if (width < 0 || height < 0)
+    {
+        return false;
+    }
+
+    const InternalFormat &formatInfo = GetSizedInternalFormatInfo(internalFormat);
+
+    if (!formatInfo.compressed && !formatInfo.paletted)
+    {
+        return false;
+    }
+
+    // A texture format can not be both block-compressed and paletted
+    ASSERT(!(formatInfo.compressed && formatInfo.paletted));
+
+    if (formatInfo.compressed)
+    {
+        // Only PVRTC1 requires dimensions to be powers of two
+        if (IsPVRTC1Format(internalFormat))
+        {
+            if (!isPow2(width) || !isPow2(height))
+            {
+                return false;
+            }
+
+            if (context->getLimitations().squarePvrtc1)
+            {
+                if (width != height)
+                {
+                    return false;
+                }
+            }
+        }
+
+        if (CompressedTextureFormatRequiresExactSize(internalFormat))
+        {
+            // In WebGL compatibility mode and D3D, enforce that the base level implied
+            // by the compressed texture's mip level would conform to the block
+            // size.
+            if (context->isWebGL() ||
+                context->getLimitations().compressedBaseMipLevelMultipleOfFour)
+            {
+                // This check is performed only for BC formats.
+                ASSERT(formatInfo.compressedBlockDepth == 1);
+                if (!ValidCompressedBaseLevel(width, formatInfo.compressedBlockWidth, level) ||
+                    !ValidCompressedBaseLevel(height, formatInfo.compressedBlockHeight, level))
+                {
+                    return false;
+                }
+            }
+            // non-WebGL and non-D3D check is not necessary for the following formats
+            // From EXT_texture_compression_s3tc specification:
+            // If the width or height is not a multiple of four, there will be 4x4 blocks at the
+            // edge of the image that contain "extra" texels that are not part of the image. From
+            // EXT_texture_compression_bptc & EXT_texture_compression_rgtc specification: If an
+            // RGTC/BPTC image has a width or height that is not a multiple of four, the data
+            // corresponding to texels outside the image are irrelevant and undefined.
+        }
+    }
+
+    if (formatInfo.paletted)
+    {
+        // TODO(http://anglebug.com/7688): multi-level paletted images
+        if (level != 0)
+        {
+            return false;
+        }
+
+        if (!isPow2(width) || !isPow2(height))
+        {
+            return false;
+        }
+    }
+
+    return true;
+}
+
+bool ValidCompressedSubImageSize(const Context *context,
+                                 GLenum internalFormat,
+                                 GLint xoffset,
+                                 GLint yoffset,
+                                 GLint zoffset,
+                                 GLsizei width,
+                                 GLsizei height,
+                                 GLsizei depth,
+                                 size_t textureWidth,
+                                 size_t textureHeight,
+                                 size_t textureDepth)
+{
+    const InternalFormat &formatInfo = GetSizedInternalFormatInfo(internalFormat);
+    if (!formatInfo.compressed)
+    {
+        return false;
+    }
+
+    if (xoffset < 0 || yoffset < 0 || zoffset < 0 || width < 0 || height < 0 || depth < 0)
+    {
+        return false;
+    }
+
+    // ANGLE does not support compressed 3D blocks (provided exclusively by ASTC 3D formats), so
+    // there is no need to check the depth here. Only width and height determine whether a 2D array
+    // element or a 2D slice of a sliced 3D texture fill the entire level.
+    bool fillsEntireMip = xoffset == 0 && yoffset == 0 &&
+                          static_cast<size_t>(width) == textureWidth &&
+                          static_cast<size_t>(height) == textureHeight;
+
+    if (CompressedFormatRequiresWholeImage(internalFormat))
+    {
+        return fillsEntireMip;
+    }
+
+    if (CompressedSubTextureFormatRequiresExactSize(internalFormat))
+    {
+        if (xoffset % formatInfo.compressedBlockWidth != 0 ||
+            yoffset % formatInfo.compressedBlockHeight != 0 ||
+            zoffset % formatInfo.compressedBlockDepth != 0)
+        {
+            return false;
+        }
+
+        // Allowed to either have data that is a multiple of block size or is smaller than the block
+        // size but fills the entire mip
+        bool sizeMultipleOfBlockSize = (width % formatInfo.compressedBlockWidth) == 0 &&
+                                       (height % formatInfo.compressedBlockHeight) == 0 &&
+                                       (depth % formatInfo.compressedBlockDepth) == 0;
+        if (!sizeMultipleOfBlockSize && !fillsEntireMip)
+        {
+            return false;
+        }
+    }
+
+    return true;
+}
+
+bool ValidImageDataSize(const Context *context,
+                        angle::EntryPoint entryPoint,
+                        TextureType texType,
+                        GLsizei width,
+                        GLsizei height,
+                        GLsizei depth,
+                        GLenum format,
+                        GLenum type,
+                        const void *pixels,
+                        GLsizei imageSize)
+{
+    Buffer *pixelUnpackBuffer = context->getState().getTargetBuffer(BufferBinding::PixelUnpack);
+    if (pixelUnpackBuffer == nullptr && imageSize < 0)
+    {
+        // Checks are not required
+        return true;
+    }
+
+    // ...the data would be unpacked from the buffer object such that the memory reads required
+    // would exceed the data store size.
+    const InternalFormat &formatInfo = GetInternalFormatInfo(format, type);
+    ASSERT(formatInfo.internalFormat != GL_NONE);
+    const Extents size(width, height, depth);
+    const auto &unpack = context->getState().getUnpackState();
+
+    bool targetIs3D = texType == TextureType::_3D || texType == TextureType::_2DArray;
+    GLuint endByte  = 0;
+    if (!formatInfo.computePackUnpackEndByte(type, size, unpack, targetIs3D, &endByte))
+    {
+        context->validationError(entryPoint, GL_INVALID_OPERATION, kIntegerOverflow);
+        return false;
+    }
+
+    if (pixelUnpackBuffer)
+    {
+        CheckedNumeric<size_t> checkedEndByte(endByte);
+        CheckedNumeric<size_t> checkedOffset(reinterpret_cast<size_t>(pixels));
+        checkedEndByte += checkedOffset;
+
+        if (!checkedEndByte.IsValid() ||
+            (checkedEndByte.ValueOrDie() > static_cast<size_t>(pixelUnpackBuffer->getSize())))
+        {
+            // Overflow past the end of the buffer
+            context->validationError(entryPoint, GL_INVALID_OPERATION, kIntegerOverflow);
+            return false;
+        }
+        if (pixelUnpackBuffer->hasWebGLXFBBindingConflict(context->isWebGL()))
+        {
+            context->validationError(entryPoint, GL_INVALID_OPERATION,
+                                     kPixelUnpackBufferBoundForTransformFeedback);
+            return false;
+        }
+    }
+    else
+    {
+        ASSERT(imageSize >= 0);
+        if (pixels == nullptr && imageSize != 0)
+        {
+            context->validationError(entryPoint, GL_INVALID_OPERATION, kImageSizeMustBeZero);
+            return false;
+        }
+
+        if (pixels != nullptr && endByte > static_cast<GLuint>(imageSize))
+        {
+            context->validationError(entryPoint, GL_INVALID_OPERATION, kImageSizeTooSmall);
+            return false;
+        }
+    }
+
+    return true;
+}
+
+bool ValidQueryType(const Context *context, QueryType queryType)
+{
+    switch (queryType)
+    {
+        case QueryType::AnySamples:
+        case QueryType::AnySamplesConservative:
+            return context->getClientMajorVersion() >= 3 ||
+                   context->getExtensions().occlusionQueryBooleanEXT;
+        case QueryType::TransformFeedbackPrimitivesWritten:
+            return (context->getClientMajorVersion() >= 3);
+        case QueryType::TimeElapsed:
+            return context->getExtensions().disjointTimerQueryEXT;
+        case QueryType::CommandsCompleted:
+            return context->getExtensions().syncQueryCHROMIUM;
+        case QueryType::PrimitivesGenerated:
+            return context->getClientVersion() >= ES_3_2 ||
+                   context->getExtensions().geometryShaderAny();
+        default:
+            return false;
+    }
+}
+
+bool ValidateWebGLVertexAttribPointer(const Context *context,
+                                      angle::EntryPoint entryPoint,
+                                      VertexAttribType type,
+                                      GLboolean normalized,
+                                      GLsizei stride,
+                                      const void *ptr,
+                                      bool pureInteger)
+{
+    ASSERT(context->isWebGL());
+    // WebGL 1.0 [Section 6.11] Vertex Attribute Data Stride
+    // The WebGL API supports vertex attribute data strides up to 255 bytes. A call to
+    // vertexAttribPointer will generate an INVALID_VALUE error if the value for the stride
+    // parameter exceeds 255.
+    constexpr GLsizei kMaxWebGLStride = 255;
+    if (stride > kMaxWebGLStride)
+    {
+        context->validationError(entryPoint, GL_INVALID_VALUE, kStrideExceedsWebGLLimit);
+        return false;
+    }
+
+    // WebGL 1.0 [Section 6.4] Buffer Offset and Stride Requirements
+    // The offset arguments to drawElements and vertexAttribPointer, and the stride argument to
+    // vertexAttribPointer, must be a multiple of the size of the data type passed to the call,
+    // or an INVALID_OPERATION error is generated.
+    angle::FormatID internalType = GetVertexFormatID(type, normalized, 1, pureInteger);
+    size_t typeSize              = GetVertexFormatSize(internalType);
+
+    ASSERT(isPow2(typeSize) && typeSize > 0);
+    size_t sizeMask = (typeSize - 1);
+    if ((reinterpret_cast<intptr_t>(ptr) & sizeMask) != 0)
+    {
+        context->validationError(entryPoint, GL_INVALID_OPERATION, kOffsetMustBeMultipleOfType);
+        return false;
+    }
+
+    if ((stride & sizeMask) != 0)
+    {
+        context->validationError(entryPoint, GL_INVALID_OPERATION, kStrideMustBeMultipleOfType);
+        return false;
+    }
+
+    return true;
+}
+
+Program *GetValidProgramNoResolve(const Context *context,
+                                  angle::EntryPoint entryPoint,
+                                  ShaderProgramID id)
+{
+    // ES3 spec (section 2.11.1) -- "Commands that accept shader or program object names will
+    // generate the error INVALID_VALUE if the provided name is not the name of either a shader
+    // or program object and INVALID_OPERATION if the provided name identifies an object
+    // that is not the expected type."
+
+    Program *validProgram = context->getProgramNoResolveLink(id);
+
+    if (!validProgram)
+    {
+        if (context->getShader(id))
+        {
+            context->validationError(entryPoint, GL_INVALID_OPERATION, kExpectedProgramName);
+        }
+        else
+        {
+            context->validationError(entryPoint, GL_INVALID_VALUE, kInvalidProgramName);
+        }
+    }
+
+    return validProgram;
+}
+
+Program *GetValidProgram(const Context *context, angle::EntryPoint entryPoint, ShaderProgramID id)
+{
+    Program *program = GetValidProgramNoResolve(context, entryPoint, id);
+    if (program)
+    {
+        program->resolveLink(context);
+    }
+    return program;
+}
+
+Shader *GetValidShader(const Context *context, angle::EntryPoint entryPoint, ShaderProgramID id)
+{
+    // See ValidProgram for spec details.
+
+    Shader *validShader = context->getShader(id);
+
+    if (!validShader)
+    {
+        if (context->getProgramNoResolveLink(id))
+        {
+            context->validationError(entryPoint, GL_INVALID_OPERATION, kExpectedShaderName);
+        }
+        else
+        {
+            context->validationError(entryPoint, GL_INVALID_VALUE, kInvalidShaderName);
+        }
+    }
+
+    return validShader;
+}
+
+bool ValidateAttachmentTarget(const Context *context,
+                              angle::EntryPoint entryPoint,
+                              GLenum attachment)
+{
+    if (attachment >= GL_COLOR_ATTACHMENT1_EXT && attachment <= GL_COLOR_ATTACHMENT15_EXT)
+    {
+        if (context->getClientMajorVersion() < 3 && !context->getExtensions().drawBuffersEXT)
+        {
+            context->validationError(entryPoint, GL_INVALID_ENUM, kInvalidAttachment);
+            return false;
+        }
+
+        // Color attachment 0 is validated below because it is always valid
+        const int colorAttachment = (attachment - GL_COLOR_ATTACHMENT0_EXT);
+        if (colorAttachment >= context->getCaps().maxColorAttachments)
+        {
+            context->validationError(entryPoint, GL_INVALID_OPERATION, kInvalidAttachment);
+            return false;
+        }
+    }
+    else
+    {
+        switch (attachment)
+        {
+            case GL_COLOR_ATTACHMENT0:
+            case GL_DEPTH_ATTACHMENT:
+            case GL_STENCIL_ATTACHMENT:
+                break;
+
+            case GL_DEPTH_STENCIL_ATTACHMENT:
+                if (!context->isWebGL() && context->getClientMajorVersion() < 3)
+                {
+                    context->validationError(entryPoint, GL_INVALID_ENUM, kInvalidAttachment);
+                    return false;
+                }
+                break;
+
+            default:
+                context->validationError(entryPoint, GL_INVALID_ENUM, kInvalidAttachment);
+                return false;
+        }
+    }
+
+    return true;
+}
+
+bool ValidateRenderbufferStorageParametersBase(const Context *context,
+                                               angle::EntryPoint entryPoint,
+                                               GLenum target,
+                                               GLsizei samples,
+                                               GLenum internalformat,
+                                               GLsizei width,
+                                               GLsizei height)
+{
+    switch (target)
+    {
+        case GL_RENDERBUFFER:
+            break;
+        default:
+            context->validationError(entryPoint, GL_INVALID_ENUM, kInvalidRenderbufferTarget);
+            return false;
+    }
+
+    if (width < 0 || height < 0 || samples < 0)
+    {
+        context->validationError(entryPoint, GL_INVALID_VALUE, kInvalidRenderbufferWidthHeight);
+        return false;
+    }
+
+    // Hack for the special WebGL 1 "DEPTH_STENCIL" internal format.
+    GLenum convertedInternalFormat = context->getConvertedRenderbufferFormat(internalformat);
+
+    const TextureCaps &formatCaps = context->getTextureCaps().get(convertedInternalFormat);
+    if (!formatCaps.renderbuffer)
+    {
+        context->validationError(entryPoint, GL_INVALID_ENUM, kInvalidRenderbufferInternalFormat);
+        return false;
+    }
+
+    // ANGLE_framebuffer_multisample does not explicitly state that the internal format must be
+    // sized but it does state that the format must be in the ES2.0 spec table 4.5 which contains
+    // only sized internal formats.
+    const InternalFormat &formatInfo = GetSizedInternalFormatInfo(convertedInternalFormat);
+    if (formatInfo.internalFormat == GL_NONE)
+    {
+        context->validationError(entryPoint, GL_INVALID_ENUM, kInvalidRenderbufferInternalFormat);
+        return false;
+    }
+
+    if (std::max(width, height) > context->getCaps().maxRenderbufferSize)
+    {
+        context->validationError(entryPoint, GL_INVALID_VALUE, kResourceMaxRenderbufferSize);
+        return false;
+    }
+
+    RenderbufferID id = context->getState().getRenderbufferId();
+    if (id.value == 0)
+    {
+        context->validationError(entryPoint, GL_INVALID_OPERATION, kInvalidRenderbufferTarget);
+        return false;
+    }
+
+    return true;
+}
+
+bool ValidateBlitFramebufferParameters(const Context *context,
+                                       angle::EntryPoint entryPoint,
+                                       GLint srcX0,
+                                       GLint srcY0,
+                                       GLint srcX1,
+                                       GLint srcY1,
+                                       GLint dstX0,
+                                       GLint dstY0,
+                                       GLint dstX1,
+                                       GLint dstY1,
+                                       GLbitfield mask,
+                                       GLenum filter)
+{
+    switch (filter)
+    {
+        case GL_NEAREST:
+            break;
+        case GL_LINEAR:
+            break;
+        default:
+            context->validationError(entryPoint, GL_INVALID_ENUM, kBlitInvalidFilter);
+            return false;
+    }
+
+    if ((mask & ~(GL_COLOR_BUFFER_BIT | GL_STENCIL_BUFFER_BIT | GL_DEPTH_BUFFER_BIT)) != 0)
+    {
+        context->validationError(entryPoint, GL_INVALID_VALUE, kBlitInvalidMask);
+        return false;
+    }
+
+    // ES3.0 spec, section 4.3.2 states that linear filtering is only available for the
+    // color buffer, leaving only nearest being unfiltered from above
+    if ((mask & ~GL_COLOR_BUFFER_BIT) != 0 && filter != GL_NEAREST)
+    {
+        context->validationError(entryPoint, GL_INVALID_OPERATION, kBlitOnlyNearestForNonColor);
+        return false;
+    }
+
+    const auto &glState          = context->getState();
+    Framebuffer *readFramebuffer = glState.getReadFramebuffer();
+    Framebuffer *drawFramebuffer = glState.getDrawFramebuffer();
+
+    if (!readFramebuffer || !drawFramebuffer)
+    {
+        context->validationError(entryPoint, GL_INVALID_FRAMEBUFFER_OPERATION,
+                                 kBlitFramebufferMissing);
+        return false;
+    }
+
+    if (!ValidateFramebufferComplete(context, entryPoint, readFramebuffer))
+    {
+        return false;
+    }
+
+    if (!ValidateFramebufferComplete(context, entryPoint, drawFramebuffer))
+    {
+        return false;
+    }
+
+    // EXT_YUV_target disallows blitting to or from a YUV framebuffer
+    if ((mask & GL_COLOR_BUFFER_BIT) != 0 &&
+        (readFramebuffer->hasYUVAttachment() || drawFramebuffer->hasYUVAttachment()))
+    {
+        context->validationError(entryPoint, GL_INVALID_OPERATION, kBlitYUVFramebuffer);
+        return false;
+    }
+
+    // The draw and read framebuffers can only match if:
+    // - They are the default framebuffer AND
+    // - The read/draw surfaces are different
+    if ((readFramebuffer->id() == drawFramebuffer->id()) &&
+        ((drawFramebuffer->id() != Framebuffer::kDefaultDrawFramebufferHandle) ||
+         (context->getCurrentDrawSurface() == context->getCurrentReadSurface())))
+    {
+        context->validationError(entryPoint, GL_INVALID_OPERATION, kBlitFeedbackLoop);
+        return false;
+    }
+
+    // Not allow blitting to MS buffers, therefore if renderToTextureSamples exist,
+    // consider it MS. checkReadBufferResourceSamples = false
+    if (!ValidateFramebufferNotMultisampled(context, entryPoint, drawFramebuffer, false))
+    {
+        return false;
+    }
+
+    // This validation is specified in the WebGL 2.0 spec and not in the GLES 3.0.5 spec, but we
+    // always run it in order to avoid triggering driver bugs.
+    if (DifferenceCanOverflow(srcX0, srcX1) || DifferenceCanOverflow(srcY0, srcY1) ||
+        DifferenceCanOverflow(dstX0, dstX1) || DifferenceCanOverflow(dstY0, dstY1))
+    {
+        context->validationError(entryPoint, GL_INVALID_VALUE, kBlitDimensionsOutOfRange);
+        return false;
+    }
+
+    bool sameBounds = srcX0 == dstX0 && srcY0 == dstY0 && srcX1 == dstX1 && srcY1 == dstY1;
+
+    if (mask & GL_COLOR_BUFFER_BIT)
+    {
+        const FramebufferAttachment *readColorBuffer = readFramebuffer->getReadColorAttachment();
+        const Extensions &extensions                 = context->getExtensions();
+
+        if (readColorBuffer)
+        {
+            const Format &readFormat = readColorBuffer->getFormat();
+
+            for (size_t drawbufferIdx = 0;
+                 drawbufferIdx < drawFramebuffer->getDrawbufferStateCount(); ++drawbufferIdx)
+            {
+                const FramebufferAttachment *attachment =
+                    drawFramebuffer->getDrawBuffer(drawbufferIdx);
+                if (attachment)
+                {
+                    const Format &drawFormat = attachment->getFormat();
+
+                    // The GL ES 3.0.2 spec (pg 193) states that:
+                    // 1) If the read buffer is fixed point format, the draw buffer must be as well
+                    // 2) If the read buffer is an unsigned integer format, the draw buffer must be
+                    // as well
+                    // 3) If the read buffer is a signed integer format, the draw buffer must be as
+                    // well
+                    // Changes with EXT_color_buffer_float:
+                    // Case 1) is changed to fixed point OR floating point
+                    GLenum readComponentType = readFormat.info->componentType;
+                    GLenum drawComponentType = drawFormat.info->componentType;
+                    bool readFixedPoint      = (readComponentType == GL_UNSIGNED_NORMALIZED ||
+                                           readComponentType == GL_SIGNED_NORMALIZED);
+                    bool drawFixedPoint      = (drawComponentType == GL_UNSIGNED_NORMALIZED ||
+                                           drawComponentType == GL_SIGNED_NORMALIZED);
+
+                    if (extensions.colorBufferFloatEXT)
+                    {
+                        bool readFixedOrFloat = (readFixedPoint || readComponentType == GL_FLOAT);
+                        bool drawFixedOrFloat = (drawFixedPoint || drawComponentType == GL_FLOAT);
+
+                        if (readFixedOrFloat != drawFixedOrFloat)
+                        {
+                            context->validationError(entryPoint, GL_INVALID_OPERATION,
+                                                     kBlitTypeMismatchFixedOrFloat);
+                            return false;
+                        }
+                    }
+                    else if (readFixedPoint != drawFixedPoint)
+                    {
+                        context->validationError(entryPoint, GL_INVALID_OPERATION,
+                                                 kBlitTypeMismatchFixedPoint);
+                        return false;
+                    }
+
+                    if (readComponentType == GL_UNSIGNED_INT &&
+                        drawComponentType != GL_UNSIGNED_INT)
+                    {
+                        context->validationError(entryPoint, GL_INVALID_OPERATION,
+                                                 kBlitTypeMismatchUnsignedInteger);
+                        return false;
+                    }
+
+                    if (readComponentType == GL_INT && drawComponentType != GL_INT)
+                    {
+                        context->validationError(entryPoint, GL_INVALID_OPERATION,
+                                                 kBlitTypeMismatchSignedInteger);
+                        return false;
+                    }
+
+                    if (readColorBuffer->getResourceSamples() > 0 &&
+                        (!Format::EquivalentForBlit(readFormat, drawFormat) || !sameBounds))
+                    {
+                        context->validationError(entryPoint, GL_INVALID_OPERATION,
+                                                 kBlitMultisampledFormatOrBoundsMismatch);
+                        return false;
+                    }
+
+                    if (context->isWebGL() && *readColorBuffer == *attachment)
+                    {
+                        context->validationError(entryPoint, GL_INVALID_OPERATION,
+                                                 kBlitSameImageColor);
+                        return false;
+                    }
+                }
+            }
+
+            if (readFormat.info->isInt() && filter == GL_LINEAR)
+            {
+                context->validationError(entryPoint, GL_INVALID_OPERATION,
+                                         kBlitIntegerWithLinearFilter);
+                return false;
+            }
+        }
+        // WebGL 2.0 BlitFramebuffer when blitting from a missing attachment
+        // In OpenGL ES it is undefined what happens when an operation tries to blit from a missing
+        // attachment and WebGL defines it to be an error. We do the check unconditionally as the
+        // situation is an application error that would lead to a crash in ANGLE.
+        else if (drawFramebuffer->hasEnabledDrawBuffer())
+        {
+            context->validationError(entryPoint, GL_INVALID_OPERATION, kBlitMissingColor);
+            return false;
+        }
+    }
+
+    GLenum masks[]       = {GL_DEPTH_BUFFER_BIT, GL_STENCIL_BUFFER_BIT};
+    GLenum attachments[] = {GL_DEPTH_ATTACHMENT, GL_STENCIL_ATTACHMENT};
+    for (size_t i = 0; i < 2; i++)
+    {
+        if (mask & masks[i])
+        {
+            const FramebufferAttachment *readBuffer =
+                readFramebuffer->getAttachment(context, attachments[i]);
+            const FramebufferAttachment *drawBuffer =
+                drawFramebuffer->getAttachment(context, attachments[i]);
+
+            if (readBuffer && drawBuffer)
+            {
+                if (!Format::EquivalentForBlit(readBuffer->getFormat(), drawBuffer->getFormat()))
+                {
+                    context->validationError(entryPoint, GL_INVALID_OPERATION,
+                                             kBlitDepthOrStencilFormatMismatch);
+                    return false;
+                }
+
+                if (readBuffer->getResourceSamples() > 0 && !sameBounds)
+                {
+                    context->validationError(entryPoint, GL_INVALID_OPERATION,
+                                             kBlitMultisampledBoundsMismatch);
+                    return false;
+                }
+
+                if (context->isWebGL() && *readBuffer == *drawBuffer)
+                {
+                    context->validationError(entryPoint, GL_INVALID_OPERATION,
+                                             kBlitSameImageDepthOrStencil);
+                    return false;
+                }
+            }
+            // WebGL 2.0 BlitFramebuffer when blitting from a missing attachment
+            else if (drawBuffer)
+            {
+                context->validationError(entryPoint, GL_INVALID_OPERATION,
+                                         kBlitMissingDepthOrStencil);
+                return false;
+            }
+        }
+    }
+
+    // OVR_multiview2:
+    // Calling BlitFramebuffer will result in an INVALID_FRAMEBUFFER_OPERATION error if the
+    // current draw framebuffer isMultiview() or the number of
+    // views in the current read framebuffer is more than one.
+    if (readFramebuffer->readDisallowedByMultiview())
+    {
+        context->validationError(entryPoint, GL_INVALID_FRAMEBUFFER_OPERATION, kBlitFromMultiview);
+        return false;
+    }
+    if (drawFramebuffer->isMultiview())
+    {
+        context->validationError(entryPoint, GL_INVALID_FRAMEBUFFER_OPERATION, kBlitToMultiview);
+        return false;
+    }
+
+    return true;
+}
+
+bool ValidateBindFramebufferBase(const Context *context,
+                                 angle::EntryPoint entryPoint,
+                                 GLenum target,
+                                 FramebufferID framebuffer)
+{
+    if (!ValidFramebufferTarget(context, target))
+    {
+        context->validationError(entryPoint, GL_INVALID_ENUM, kInvalidFramebufferTarget);
+        return false;
+    }
+
+    if (!context->getState().isBindGeneratesResourceEnabled() &&
+        !context->isFramebufferGenerated(framebuffer))
+    {
+        context->validationError(entryPoint, GL_INVALID_OPERATION, kObjectNotGenerated);
+        return false;
+    }
+
+    return true;
+}
+
+bool ValidateBindRenderbufferBase(const Context *context,
+                                  angle::EntryPoint entryPoint,
+                                  GLenum target,
+                                  RenderbufferID renderbuffer)
+{
+    if (target != GL_RENDERBUFFER)
+    {
+        context->validationError(entryPoint, GL_INVALID_ENUM, kInvalidRenderbufferTarget);
+        return false;
+    }
+
+    if (!context->getState().isBindGeneratesResourceEnabled() &&
+        !context->isRenderbufferGenerated(renderbuffer))
+    {
+        context->validationError(entryPoint, GL_INVALID_OPERATION, kObjectNotGenerated);
+        return false;
+    }
+
+    return true;
+}
+
+bool ValidateFramebufferParameteriBase(const Context *context,
+                                       angle::EntryPoint entryPoint,
+                                       GLenum target,
+                                       GLenum pname,
+                                       GLint param)
+{
+    if (!ValidFramebufferTarget(context, target))
+    {
+        context->validationError(entryPoint, GL_INVALID_ENUM, kInvalidFramebufferTarget);
+        return false;
+    }
+
+    switch (pname)
+    {
+        case GL_FRAMEBUFFER_DEFAULT_WIDTH:
+        {
+            GLint maxWidth = context->getCaps().maxFramebufferWidth;
+            if (param < 0 || param > maxWidth)
+            {
+                context->validationError(entryPoint, GL_INVALID_VALUE, kExceedsFramebufferWidth);
+                return false;
+            }
+            break;
+        }
+        case GL_FRAMEBUFFER_DEFAULT_HEIGHT:
+        {
+            GLint maxHeight = context->getCaps().maxFramebufferHeight;
+            if (param < 0 || param > maxHeight)
+            {
+                context->validationError(entryPoint, GL_INVALID_VALUE, kExceedsFramebufferHeight);
+                return false;
+            }
+            break;
+        }
+        case GL_FRAMEBUFFER_DEFAULT_SAMPLES:
+        {
+            GLint maxSamples = context->getCaps().maxFramebufferSamples;
+            if (param < 0 || param > maxSamples)
+            {
+                context->validationError(entryPoint, GL_INVALID_VALUE, kExceedsFramebufferSamples);
+                return false;
+            }
+            break;
+        }
+        case GL_FRAMEBUFFER_DEFAULT_FIXED_SAMPLE_LOCATIONS:
+        {
+            break;
+        }
+        case GL_FRAMEBUFFER_DEFAULT_LAYERS_EXT:
+        {
+            if (!context->getExtensions().geometryShaderAny() &&
+                context->getClientVersion() < ES_3_2)
+            {
+                context->validationError(entryPoint, GL_INVALID_ENUM,
+                                         kGeometryShaderExtensionNotEnabled);
+                return false;
+            }
+            GLint maxLayers = context->getCaps().maxFramebufferLayers;
+            if (param < 0 || param > maxLayers)
+            {
+                context->validationError(entryPoint, GL_INVALID_VALUE, kInvalidFramebufferLayer);
+                return false;
+            }
+            break;
+        }
+        case GL_FRAMEBUFFER_FLIP_Y_MESA:
+        {
+            if (!context->getExtensions().framebufferFlipYMESA)
+            {
+                context->validationError(entryPoint, GL_INVALID_ENUM, kInvalidPname);
+                return false;
+            }
+            break;
+        }
+        default:
+        {
+            context->validationError(entryPoint, GL_INVALID_ENUM, kInvalidPname);
+            return false;
+        }
+    }
+
+    const Framebuffer *framebuffer = context->getState().getTargetFramebuffer(target);
+    ASSERT(framebuffer);
+    if (framebuffer->isDefault())
+    {
+        context->validationError(entryPoint, GL_INVALID_OPERATION, kDefaultFramebuffer);
+        return false;
+    }
+    return true;
+}
+
+bool ValidateFramebufferRenderbufferBase(const Context *context,
+                                         angle::EntryPoint entryPoint,
+                                         GLenum target,
+                                         GLenum attachment,
+                                         GLenum renderbuffertarget,
+                                         RenderbufferID renderbuffer)
+{
+    if (!ValidFramebufferTarget(context, target))
+    {
+        context->validationError(entryPoint, GL_INVALID_ENUM, kInvalidFramebufferTarget);
+        return false;
+    }
+
+    if (renderbuffertarget != GL_RENDERBUFFER)
+    {
+        context->validationError(entryPoint, GL_INVALID_ENUM, kInvalidRenderbufferTarget);
+        return false;
+    }
+
+    Framebuffer *framebuffer = context->getState().getTargetFramebuffer(target);
+
+    ASSERT(framebuffer);
+    if (framebuffer->isDefault())
+    {
+        context->validationError(entryPoint, GL_INVALID_OPERATION, kDefaultFramebufferTarget);
+        return false;
+    }
+
+    if (!ValidateAttachmentTarget(context, entryPoint, attachment))
+    {
+        return false;
+    }
+
+    // [OpenGL ES 2.0.25] Section 4.4.3 page 112
+    // [OpenGL ES 3.0.2] Section 4.4.2 page 201
+    // 'renderbuffer' must be either zero or the name of an existing renderbuffer object of
+    // type 'renderbuffertarget', otherwise an INVALID_OPERATION error is generated.
+    if (renderbuffer.value != 0)
+    {
+        if (!context->getRenderbuffer(renderbuffer))
+        {
+            context->validationError(entryPoint, GL_INVALID_OPERATION, kInvalidRenderbufferTarget);
+            return false;
+        }
+    }
+
+    return true;
+}
+
+bool ValidateFramebufferTextureBase(const Context *context,
+                                    angle::EntryPoint entryPoint,
+                                    GLenum target,
+                                    GLenum attachment,
+                                    TextureID texture,
+                                    GLint level)
+{
+    if (!ValidFramebufferTarget(context, target))
+    {
+        context->validationError(entryPoint, GL_INVALID_ENUM, kInvalidFramebufferTarget);
+        return false;
+    }
+
+    if (!ValidateAttachmentTarget(context, entryPoint, attachment))
+    {
+        return false;
+    }
+
+    if (texture.value != 0)
+    {
+        Texture *tex = context->getTexture(texture);
+
+        if (tex == nullptr)
+        {
+            context->validationError(entryPoint, GL_INVALID_OPERATION, kMissingTexture);
+            return false;
+        }
+
+        if (level < 0)
+        {
+            context->validationError(entryPoint, GL_INVALID_VALUE, kInvalidMipLevel);
+            return false;
+        }
+
+        // GLES spec 3.1, Section 9.2.8 "Attaching Texture Images to a Framebuffer"
+        // An INVALID_VALUE error is generated if texture is not zero and level is
+        // not a supported texture level for textarget
+
+        // Common criteria for not supported texture levels(other criteria are handled case by case
+        // in non base functions): If texture refers to an immutable-format texture, level must be
+        // greater than or equal to zero and smaller than the value of TEXTURE_IMMUTABLE_LEVELS for
+        // texture.
+        if (tex->getImmutableFormat() && context->getClientVersion() >= ES_3_1)
+        {
+            if (level >= static_cast<GLint>(tex->getImmutableLevels()))
+            {
+                context->validationError(entryPoint, GL_INVALID_VALUE, kInvalidMipLevel);
+                return false;
+            }
+        }
+
+        // GLES spec 3.2, Section 9.2.8 "Attaching Texture Images to a Framebuffer"
+        // An INVALID_OPERATION error is generated if <texture> is the name of a buffer texture.
+        if ((context->getClientVersion() >= ES_3_2 ||
+             context->getExtensions().textureBufferAny()) &&
+            tex->getType() == TextureType::Buffer)
+        {
+            context->validationError(entryPoint, GL_INVALID_OPERATION, kInvalidTextureTarget);
+            return false;
+        }
+
+        if (tex->getState().hasProtectedContent() != context->getState().hasProtectedContent())
+        {
+            context->validationError(
+                entryPoint, GL_INVALID_OPERATION,
+                "Mismatch between Texture and Context Protected Content state");
+            return false;
+        }
+    }
+
+    const Framebuffer *framebuffer = context->getState().getTargetFramebuffer(target);
+    ASSERT(framebuffer);
+
+    if (framebuffer->isDefault())
+    {
+        context->validationError(entryPoint, GL_INVALID_OPERATION, kDefaultFramebufferTarget);
+        return false;
+    }
+
+    return true;
+}
+
+bool ValidateGenerateMipmapBase(const Context *context,
+                                angle::EntryPoint entryPoint,
+                                TextureType target)
+{
+    if (!ValidTextureTarget(context, target))
+    {
+        context->validationError(entryPoint, GL_INVALID_ENUM, kInvalidTextureTarget);
+        return false;
+    }
+
+    Texture *texture = context->getTextureByType(target);
+
+    if (texture == nullptr)
+    {
+        context->validationError(entryPoint, GL_INVALID_OPERATION, kTextureNotBound);
+        return false;
+    }
+
+    const GLuint effectiveBaseLevel = texture->getTextureState().getEffectiveBaseLevel();
+
+    // This error isn't spelled out in the spec in a very explicit way, but we interpret the spec so
+    // that out-of-range base level has a non-color-renderable / non-texture-filterable format.
+    if (effectiveBaseLevel >= IMPLEMENTATION_MAX_TEXTURE_LEVELS)
+    {
+        context->validationError(entryPoint, GL_INVALID_OPERATION, kBaseLevelOutOfRange);
+        return false;
+    }
+
+    TextureTarget baseTarget = (target == TextureType::CubeMap)
+                                   ? TextureTarget::CubeMapPositiveX
+                                   : NonCubeTextureTypeToTarget(target);
+    const auto &format       = *(texture->getFormat(baseTarget, effectiveBaseLevel).info);
+    if (format.sizedInternalFormat == GL_NONE || format.compressed || format.depthBits > 0 ||
+        format.stencilBits > 0)
+    {
+        context->validationError(entryPoint, GL_INVALID_OPERATION, kGenerateMipmapNotAllowed);
+        return false;
+    }
+
+    // GenerateMipmap accepts formats that are unsized or both color renderable and filterable.
+    bool formatUnsized = !format.sized;
+    bool formatColorRenderableAndFilterable =
+        format.filterSupport(context->getClientVersion(), context->getExtensions()) &&
+        format.textureAttachmentSupport(context->getClientVersion(), context->getExtensions());
+    if (!formatUnsized && !formatColorRenderableAndFilterable)
+    {
+        context->validationError(entryPoint, GL_INVALID_OPERATION, kGenerateMipmapNotAllowed);
+        return false;
+    }
+
+    // GL_EXT_sRGB adds an unsized SRGB (no alpha) format which has explicitly disabled mipmap
+    // generation
+    if (format.colorEncoding == GL_SRGB && format.format == GL_RGB)
+    {
+        context->validationError(entryPoint, GL_INVALID_OPERATION, kGenerateMipmapNotAllowed);
+        return false;
+    }
+
+    // According to the OpenGL extension spec EXT_sRGB.txt, EXT_SRGB is based on ES 2.0 and
+    // generateMipmap is not allowed if texture format is SRGB_EXT or SRGB_ALPHA_EXT.
+    if (context->getClientVersion() < Version(3, 0) && format.colorEncoding == GL_SRGB)
+    {
+        context->validationError(entryPoint, GL_INVALID_OPERATION, kGenerateMipmapNotAllowed);
+        return false;
+    }
+
+    // Non-power of 2 ES2 check
+    if (context->getClientVersion() < Version(3, 0) && !context->getExtensions().textureNpotOES &&
+        (!isPow2(static_cast<int>(texture->getWidth(baseTarget, 0))) ||
+         !isPow2(static_cast<int>(texture->getHeight(baseTarget, 0)))))
+    {
+        ASSERT(target == TextureType::_2D || target == TextureType::Rectangle ||
+               target == TextureType::CubeMap);
+        context->validationError(entryPoint, GL_INVALID_OPERATION, kTextureNotPow2);
+        return false;
+    }
+
+    // Cube completeness check
+    if (target == TextureType::CubeMap && !texture->getTextureState().isCubeComplete())
+    {
+        context->validationError(entryPoint, GL_INVALID_OPERATION, kCubemapIncomplete);
+        return false;
+    }
+
+    if (context->isWebGL() && (texture->getWidth(baseTarget, effectiveBaseLevel) == 0 ||
+                               texture->getHeight(baseTarget, effectiveBaseLevel) == 0))
+    {
+        context->validationError(entryPoint, GL_INVALID_OPERATION, kGenerateMipmapZeroSize);
+        return false;
+    }
+
+    return true;
+}
+
+bool ValidateReadPixelsRobustANGLE(const Context *context,
+                                   angle::EntryPoint entryPoint,
+                                   GLint x,
+                                   GLint y,
+                                   GLsizei width,
+                                   GLsizei height,
+                                   GLenum format,
+                                   GLenum type,
+                                   GLsizei bufSize,
+                                   const GLsizei *length,
+                                   const GLsizei *columns,
+                                   const GLsizei *rows,
+                                   const void *pixels)
+{
+    if (!ValidateRobustEntryPoint(context, entryPoint, bufSize))
+    {
+        return false;
+    }
+
+    GLsizei writeLength  = 0;
+    GLsizei writeColumns = 0;
+    GLsizei writeRows    = 0;
+
+    if (!ValidateReadPixelsBase(context, entryPoint, x, y, width, height, format, type, bufSize,
+                                &writeLength, &writeColumns, &writeRows, pixels))
+    {
+        return false;
+    }
+
+    if (!ValidateRobustBufferSize(context, entryPoint, bufSize, writeLength))
+    {
+        return false;
+    }
+
+    SetRobustLengthParam(length, writeLength);
+    SetRobustLengthParam(columns, writeColumns);
+    SetRobustLengthParam(rows, writeRows);
+
+    return true;
+}
+
+bool ValidateReadnPixelsEXT(const Context *context,
+                            angle::EntryPoint entryPoint,
+                            GLint x,
+                            GLint y,
+                            GLsizei width,
+                            GLsizei height,
+                            GLenum format,
+                            GLenum type,
+                            GLsizei bufSize,
+                            const void *pixels)
+{
+    if (bufSize < 0)
+    {
+        context->validationError(entryPoint, GL_INVALID_VALUE, kNegativeBufferSize);
+        return false;
+    }
+
+    return ValidateReadPixelsBase(context, entryPoint, x, y, width, height, format, type, bufSize,
+                                  nullptr, nullptr, nullptr, pixels);
+}
+
+bool ValidateReadnPixelsRobustANGLE(const Context *context,
+                                    angle::EntryPoint entryPoint,
+                                    GLint x,
+                                    GLint y,
+                                    GLsizei width,
+                                    GLsizei height,
+                                    GLenum format,
+                                    GLenum type,
+                                    GLsizei bufSize,
+                                    const GLsizei *length,
+                                    const GLsizei *columns,
+                                    const GLsizei *rows,
+                                    const void *data)
+{
+    GLsizei writeLength  = 0;
+    GLsizei writeColumns = 0;
+    GLsizei writeRows    = 0;
+
+    if (!ValidateRobustEntryPoint(context, entryPoint, bufSize))
+    {
+        return false;
+    }
+
+    if (!ValidateReadPixelsBase(context, entryPoint, x, y, width, height, format, type, bufSize,
+                                &writeLength, &writeColumns, &writeRows, data))
+    {
+        return false;
+    }
+
+    if (!ValidateRobustBufferSize(context, entryPoint, bufSize, writeLength))
+    {
+        return false;
+    }
+
+    SetRobustLengthParam(length, writeLength);
+    SetRobustLengthParam(columns, writeColumns);
+    SetRobustLengthParam(rows, writeRows);
+
+    return true;
+}
+
+bool ValidateGenQueriesEXT(const Context *context,
+                           angle::EntryPoint entryPoint,
+                           GLsizei n,
+                           const QueryID *ids)
+{
+    if (!context->getExtensions().occlusionQueryBooleanEXT &&
+        !context->getExtensions().disjointTimerQueryEXT)
+    {
+        context->validationError(entryPoint, GL_INVALID_OPERATION, kQueryExtensionNotEnabled);
+        return false;
+    }
+
+    return ValidateGenOrDelete(context, entryPoint, n);
+}
+
+bool ValidateDeleteQueriesEXT(const Context *context,
+                              angle::EntryPoint entryPoint,
+                              GLsizei n,
+                              const QueryID *ids)
+{
+    if (!context->getExtensions().occlusionQueryBooleanEXT &&
+        !context->getExtensions().disjointTimerQueryEXT)
+    {
+        context->validationError(entryPoint, GL_INVALID_OPERATION, kQueryExtensionNotEnabled);
+        return false;
+    }
+
+    return ValidateGenOrDelete(context, entryPoint, n);
+}
+
+bool ValidateIsQueryEXT(const Context *context, angle::EntryPoint entryPoint, QueryID id)
+{
+    if (!context->getExtensions().occlusionQueryBooleanEXT &&
+        !context->getExtensions().disjointTimerQueryEXT)
+    {
+        context->validationError(entryPoint, GL_INVALID_OPERATION, kQueryExtensionNotEnabled);
+        return false;
+    }
+
+    return true;
+}
+
+bool ValidateBeginQueryBase(const Context *context,
+                            angle::EntryPoint entryPoint,
+                            QueryType target,
+                            QueryID id)
+{
+    if (!ValidQueryType(context, target))
+    {
+        context->validationError(entryPoint, GL_INVALID_ENUM, kInvalidQueryType);
+        return false;
+    }
+
+    if (id.value == 0)
+    {
+        context->validationError(entryPoint, GL_INVALID_OPERATION, kInvalidQueryId);
+        return false;
+    }
+
+    // From EXT_occlusion_query_boolean: If BeginQueryEXT is called with an <id>
+    // of zero, if the active query object name for <target> is non-zero (for the
+    // targets ANY_SAMPLES_PASSED_EXT and ANY_SAMPLES_PASSED_CONSERVATIVE_EXT, if
+    // the active query for either target is non-zero), if <id> is the name of an
+    // existing query object whose type does not match <target>, or if <id> is the
+    // active query object name for any query type, the error INVALID_OPERATION is
+    // generated.
+
+    // Ensure no other queries are active
+    // NOTE: If other queries than occlusion are supported, we will need to check
+    // separately that:
+    //    a) The query ID passed is not the current active query for any target/type
+    //    b) There are no active queries for the requested target (and in the case
+    //       of GL_ANY_SAMPLES_PASSED_EXT and GL_ANY_SAMPLES_PASSED_CONSERVATIVE_EXT,
+    //       no query may be active for either if glBeginQuery targets either.
+
+    if (context->getState().isQueryActive(target))
+    {
+        context->validationError(entryPoint, GL_INVALID_OPERATION, kOtherQueryActive);
+        return false;
+    }
+
+    // check that name was obtained with glGenQueries
+    if (!context->isQueryGenerated(id))
+    {
+        context->validationError(entryPoint, GL_INVALID_OPERATION, kInvalidQueryId);
+        return false;
+    }
+
+    // Check for type mismatch. If query is not yet started we're good to go.
+    Query *queryObject = context->getQuery(id);
+    if (queryObject && queryObject->getType() != target)
+    {
+        context->validationError(entryPoint, GL_INVALID_OPERATION, kQueryTargetMismatch);
+        return false;
+    }
+
+    return true;
+}
+
+bool ValidateBeginQueryEXT(const Context *context,
+                           angle::EntryPoint entryPoint,
+                           QueryType target,
+                           QueryID id)
+{
+    if (!context->getExtensions().occlusionQueryBooleanEXT &&
+        !context->getExtensions().disjointTimerQueryEXT &&
+        !context->getExtensions().syncQueryCHROMIUM)
+    {
+        context->validationError(entryPoint, GL_INVALID_OPERATION, kQueryExtensionNotEnabled);
+        return false;
+    }
+
+    return ValidateBeginQueryBase(context, entryPoint, target, id);
+}
+
+bool ValidateEndQueryBase(const Context *context, angle::EntryPoint entryPoint, QueryType target)
+{
+    if (!ValidQueryType(context, target))
+    {
+        context->validationError(entryPoint, GL_INVALID_ENUM, kInvalidQueryType);
+        return false;
+    }
+
+    const Query *queryObject = context->getState().getActiveQuery(target);
+
+    if (queryObject == nullptr)
+    {
+        context->validationError(entryPoint, GL_INVALID_OPERATION, kQueryInactive);
+        return false;
+    }
+
+    return true;
+}
+
+bool ValidateEndQueryEXT(const Context *context, angle::EntryPoint entryPoint, QueryType target)
+{
+    if (!context->getExtensions().occlusionQueryBooleanEXT &&
+        !context->getExtensions().disjointTimerQueryEXT &&
+        !context->getExtensions().syncQueryCHROMIUM)
+    {
+        context->validationError(entryPoint, GL_INVALID_OPERATION, kQueryExtensionNotEnabled);
+        return false;
+    }
+
+    return ValidateEndQueryBase(context, entryPoint, target);
+}
+
+bool ValidateQueryCounterEXT(const Context *context,
+                             angle::EntryPoint entryPoint,
+                             QueryID id,
+                             QueryType target)
+{
+    if (!context->getExtensions().disjointTimerQueryEXT)
+    {
+        context->validationError(entryPoint, GL_INVALID_OPERATION, kExtensionNotEnabled);
+        return false;
+    }
+
+    if (target != QueryType::Timestamp)
+    {
+        context->validationError(entryPoint, GL_INVALID_ENUM, kInvalidQueryTarget);
+        return false;
+    }
+
+    if (!context->isQueryGenerated(id))
+    {
+        context->validationError(entryPoint, GL_INVALID_OPERATION, kInvalidQueryId);
+        return false;
+    }
+
+    // If query object is not started, that's fine.
+    Query *queryObject = context->getQuery(id);
+    if (queryObject && context->getState().isQueryActive(queryObject))
+    {
+        context->validationError(entryPoint, GL_INVALID_OPERATION, kQueryActive);
+        return false;
+    }
+
+    return true;
+}
+
+bool ValidateGetQueryivBase(const Context *context,
+                            angle::EntryPoint entryPoint,
+                            QueryType target,
+                            GLenum pname,
+                            GLsizei *numParams)
+{
+    if (numParams)
+    {
+        *numParams = 0;
+    }
+
+    if (!ValidQueryType(context, target) && target != QueryType::Timestamp)
+    {
+        context->validationError(entryPoint, GL_INVALID_ENUM, kInvalidQueryType);
+        return false;
+    }
+
+    switch (pname)
+    {
+        case GL_CURRENT_QUERY_EXT:
+            if (target == QueryType::Timestamp)
+            {
+                context->validationError(entryPoint, GL_INVALID_ENUM, kInvalidQueryTarget);
+                return false;
+            }
+            break;
+        case GL_QUERY_COUNTER_BITS_EXT:
+            if (!context->getExtensions().disjointTimerQueryEXT ||
+                (target != QueryType::Timestamp && target != QueryType::TimeElapsed))
+            {
+                context->validationError(entryPoint, GL_INVALID_ENUM, kInvalidPname);
+                return false;
+            }
+            break;
+        default:
+            context->validationError(entryPoint, GL_INVALID_ENUM, kInvalidPname);
+            return false;
+    }
+
+    if (numParams)
+    {
+        // All queries return only one value
+        *numParams = 1;
+    }
+
+    return true;
+}
+
+bool ValidateGetQueryivEXT(const Context *context,
+                           angle::EntryPoint entryPoint,
+                           QueryType target,
+                           GLenum pname,
+                           const GLint *params)
+{
+    if (!context->getExtensions().occlusionQueryBooleanEXT &&
+        !context->getExtensions().disjointTimerQueryEXT &&
+        !context->getExtensions().syncQueryCHROMIUM)
+    {
+        context->validationError(entryPoint, GL_INVALID_OPERATION, kExtensionNotEnabled);
+        return false;
+    }
+
+    return ValidateGetQueryivBase(context, entryPoint, target, pname, nullptr);
+}
+
+bool ValidateGetQueryivRobustANGLE(const Context *context,
+                                   angle::EntryPoint entryPoint,
+                                   QueryType target,
+                                   GLenum pname,
+                                   GLsizei bufSize,
+                                   const GLsizei *length,
+                                   const GLint *params)
+{
+    if (!ValidateRobustEntryPoint(context, entryPoint, bufSize))
+    {
+        return false;
+    }
+
+    GLsizei numParams = 0;
+
+    if (!ValidateGetQueryivBase(context, entryPoint, target, pname, &numParams))
+    {
+        return false;
+    }
+
+    if (!ValidateRobustBufferSize(context, entryPoint, bufSize, numParams))
+    {
+        return false;
+    }
+
+    SetRobustLengthParam(length, numParams);
+
+    return true;
+}
+
+bool ValidateGetQueryObjectValueBase(const Context *context,
+                                     angle::EntryPoint entryPoint,
+                                     QueryID id,
+                                     GLenum pname,
+                                     GLsizei *numParams)
+{
+    if (numParams)
+    {
+        *numParams = 1;
+    }
+
+    if (context->isContextLost())
+    {
+        context->validationError(entryPoint, GL_CONTEXT_LOST, kContextLost);
+
+        if (pname == GL_QUERY_RESULT_AVAILABLE_EXT)
+        {
+            // Generate an error but still return true, the context still needs to return a
+            // value in this case.
+            return true;
+        }
+        else
+        {
+            return false;
+        }
+    }
+
+    Query *queryObject = context->getQuery(id);
+
+    if (!queryObject)
+    {
+        context->validationError(entryPoint, GL_INVALID_OPERATION, kInvalidQueryId);
+        return false;
+    }
+
+    if (context->getState().isQueryActive(queryObject))
+    {
+        context->validationError(entryPoint, GL_INVALID_OPERATION, kQueryActive);
+        return false;
+    }
+
+    switch (pname)
+    {
+        case GL_QUERY_RESULT_EXT:
+        case GL_QUERY_RESULT_AVAILABLE_EXT:
+            break;
+
+        default:
+            context->validationErrorF(entryPoint, GL_INVALID_ENUM, kEnumNotSupported, pname);
+            return false;
+    }
+
+    return true;
+}
+
+bool ValidateGetQueryObjectivEXT(const Context *context,
+                                 angle::EntryPoint entryPoint,
+                                 QueryID id,
+                                 GLenum pname,
+                                 const GLint *params)
+{
+    if (!context->getExtensions().disjointTimerQueryEXT)
+    {
+        context->validationError(entryPoint, GL_INVALID_OPERATION, kExtensionNotEnabled);
+        return false;
+    }
+    return ValidateGetQueryObjectValueBase(context, entryPoint, id, pname, nullptr);
+}
+
+bool ValidateGetQueryObjectivRobustANGLE(const Context *context,
+                                         angle::EntryPoint entryPoint,
+                                         QueryID id,
+                                         GLenum pname,
+                                         GLsizei bufSize,
+                                         const GLsizei *length,
+                                         const GLint *params)
+{
+    if (!context->getExtensions().disjointTimerQueryEXT)
+    {
+        context->validationError(entryPoint, GL_INVALID_OPERATION, kExtensionNotEnabled);
+        return false;
+    }
+
+    if (!ValidateRobustEntryPoint(context, entryPoint, bufSize))
+    {
+        return false;
+    }
+
+    GLsizei numParams = 0;
+
+    if (!ValidateGetQueryObjectValueBase(context, entryPoint, id, pname, &numParams))
+    {
+        return false;
+    }
+
+    if (!ValidateRobustBufferSize(context, entryPoint, bufSize, numParams))
+    {
+        return false;
+    }
+
+    SetRobustLengthParam(length, numParams);
+
+    return true;
+}
+
+bool ValidateGetQueryObjectuivEXT(const Context *context,
+                                  angle::EntryPoint entryPoint,
+                                  QueryID id,
+                                  GLenum pname,
+                                  const GLuint *params)
+{
+    if (!context->getExtensions().disjointTimerQueryEXT &&
+        !context->getExtensions().occlusionQueryBooleanEXT &&
+        !context->getExtensions().syncQueryCHROMIUM)
+    {
+        context->validationError(entryPoint, GL_INVALID_OPERATION, kExtensionNotEnabled);
+        return false;
+    }
+    return ValidateGetQueryObjectValueBase(context, entryPoint, id, pname, nullptr);
+}
+
+bool ValidateGetQueryObjectuivRobustANGLE(const Context *context,
+                                          angle::EntryPoint entryPoint,
+                                          QueryID id,
+                                          GLenum pname,
+                                          GLsizei bufSize,
+                                          const GLsizei *length,
+                                          const GLuint *params)
+{
+    if (!context->getExtensions().disjointTimerQueryEXT &&
+        !context->getExtensions().occlusionQueryBooleanEXT &&
+        !context->getExtensions().syncQueryCHROMIUM)
+    {
+        context->validationError(entryPoint, GL_INVALID_OPERATION, kExtensionNotEnabled);
+        return false;
+    }
+
+    if (!ValidateRobustEntryPoint(context, entryPoint, bufSize))
+    {
+        return false;
+    }
+
+    GLsizei numParams = 0;
+
+    if (!ValidateGetQueryObjectValueBase(context, entryPoint, id, pname, &numParams))
+    {
+        return false;
+    }
+
+    if (!ValidateRobustBufferSize(context, entryPoint, bufSize, numParams))
+    {
+        return false;
+    }
+
+    SetRobustLengthParam(length, numParams);
+
+    return true;
+}
+
+bool ValidateGetQueryObjecti64vEXT(const Context *context,
+                                   angle::EntryPoint entryPoint,
+                                   QueryID id,
+                                   GLenum pname,
+                                   GLint64 *params)
+{
+    if (!context->getExtensions().disjointTimerQueryEXT)
+    {
+        context->validationError(entryPoint, GL_INVALID_OPERATION, kExtensionNotEnabled);
+        return false;
+    }
+    return ValidateGetQueryObjectValueBase(context, entryPoint, id, pname, nullptr);
+}
+
+bool ValidateGetQueryObjecti64vRobustANGLE(const Context *context,
+                                           angle::EntryPoint entryPoint,
+                                           QueryID id,
+                                           GLenum pname,
+                                           GLsizei bufSize,
+                                           const GLsizei *length,
+                                           GLint64 *params)
+{
+    if (!context->getExtensions().disjointTimerQueryEXT)
+    {
+        context->validationError(entryPoint, GL_INVALID_OPERATION, kExtensionNotEnabled);
+        return false;
+    }
+
+    if (!ValidateRobustEntryPoint(context, entryPoint, bufSize))
+    {
+        return false;
+    }
+
+    GLsizei numParams = 0;
+
+    if (!ValidateGetQueryObjectValueBase(context, entryPoint, id, pname, &numParams))
+    {
+        return false;
+    }
+
+    if (!ValidateRobustBufferSize(context, entryPoint, bufSize, numParams))
+    {
+        return false;
+    }
+
+    SetRobustLengthParam(length, numParams);
+
+    return true;
+}
+
+bool ValidateGetQueryObjectui64vEXT(const Context *context,
+                                    angle::EntryPoint entryPoint,
+                                    QueryID id,
+                                    GLenum pname,
+                                    GLuint64 *params)
+{
+    if (!context->getExtensions().disjointTimerQueryEXT)
+    {
+        context->validationError(entryPoint, GL_INVALID_OPERATION, kExtensionNotEnabled);
+        return false;
+    }
+    return ValidateGetQueryObjectValueBase(context, entryPoint, id, pname, nullptr);
+}
+
+bool ValidateGetQueryObjectui64vRobustANGLE(const Context *context,
+                                            angle::EntryPoint entryPoint,
+                                            QueryID id,
+                                            GLenum pname,
+                                            GLsizei bufSize,
+                                            const GLsizei *length,
+                                            GLuint64 *params)
+{
+    if (!context->getExtensions().disjointTimerQueryEXT)
+    {
+        context->validationError(entryPoint, GL_INVALID_OPERATION, kExtensionNotEnabled);
+        return false;
+    }
+
+    if (!ValidateRobustEntryPoint(context, entryPoint, bufSize))
+    {
+        return false;
+    }
+
+    GLsizei numParams = 0;
+
+    if (!ValidateGetQueryObjectValueBase(context, entryPoint, id, pname, &numParams))
+    {
+        return false;
+    }
+
+    if (!ValidateRobustBufferSize(context, entryPoint, bufSize, numParams))
+    {
+        return false;
+    }
+
+    SetRobustLengthParam(length, numParams);
+
+    return true;
+}
+
+bool ValidateUniformCommonBase(const Context *context,
+                               angle::EntryPoint entryPoint,
+                               const Program *program,
+                               UniformLocation location,
+                               GLsizei count,
+                               const LinkedUniform **uniformOut)
+{
+    // TODO(Jiajia): Add image uniform check in future.
+    if (count < 0)
+    {
+        context->validationError(entryPoint, GL_INVALID_VALUE, kNegativeCount);
+        return false;
+    }
+
+    if (!program)
+    {
+        context->validationError(entryPoint, GL_INVALID_OPERATION, kInvalidProgramName);
+        return false;
+    }
+
+    if (!program->isLinked())
+    {
+        context->validationError(entryPoint, GL_INVALID_OPERATION, kProgramNotLinked);
+        return false;
+    }
+
+    if (location.value == -1)
+    {
+        // Silently ignore the uniform command
+        return false;
+    }
+
+    const auto &uniformLocations = program->getUniformLocations();
+    size_t castedLocation        = static_cast<size_t>(location.value);
+    if (castedLocation >= uniformLocations.size())
+    {
+        context->validationError(entryPoint, GL_INVALID_OPERATION, kInvalidUniformLocation);
+        return false;
+    }
+
+    const auto &uniformLocation = uniformLocations[castedLocation];
+    if (uniformLocation.ignored)
+    {
+        // Silently ignore the uniform command
+        return false;
+    }
+
+    if (!uniformLocation.used())
+    {
+        context->validationError(entryPoint, GL_INVALID_OPERATION, kInvalidUniformLocation);
+        return false;
+    }
+
+    const auto &uniform = program->getUniformByIndex(uniformLocation.index);
+
+    // attempting to write an array to a non-array uniform is an INVALID_OPERATION
+    if (count > 1 && !uniform.isArray())
+    {
+        context->validationError(entryPoint, GL_INVALID_OPERATION, kInvalidUniformCount);
+        return false;
+    }
+
+    *uniformOut = &uniform;
+    return true;
+}
+
+bool ValidateUniform1ivValue(const Context *context,
+                             angle::EntryPoint entryPoint,
+                             GLenum uniformType,
+                             GLsizei count,
+                             const GLint *value)
+{
+    // Value type is GL_INT, because we only get here from glUniform1i{v}.
+    // It is compatible with INT or BOOL.
+    // Do these cheap tests first, for a little extra speed.
+    if (GL_INT == uniformType || GL_BOOL == uniformType)
+    {
+        return true;
+    }
+
+    if (IsSamplerType(uniformType))
+    {
+        // Check that the values are in range.
+        const GLint max = context->getCaps().maxCombinedTextureImageUnits;
+        for (GLsizei i = 0; i < count; ++i)
+        {
+            if (value[i] < 0 || value[i] >= max)
+            {
+                context->validationError(entryPoint, GL_INVALID_VALUE,
+                                         kSamplerUniformValueOutOfRange);
+                return false;
+            }
+        }
+        return true;
+    }
+
+    context->validationError(entryPoint, GL_INVALID_OPERATION, kUniformTypeMismatch);
+    return false;
+}
+
+bool ValidateUniformMatrixValue(const Context *context,
+                                angle::EntryPoint entryPoint,
+                                GLenum valueType,
+                                GLenum uniformType)
+{
+    // Check that the value type is compatible with uniform type.
+    if (valueType == uniformType)
+    {
+        return true;
+    }
+
+    context->validationError(entryPoint, GL_INVALID_OPERATION, kUniformTypeMismatch);
+    return false;
+}
+
+bool ValidateUniform(const Context *context,
+                     angle::EntryPoint entryPoint,
+                     GLenum valueType,
+                     UniformLocation location,
+                     GLsizei count)
+{
+    const LinkedUniform *uniform = nullptr;
+    Program *programObject       = context->getActiveLinkedProgram();
+    return ValidateUniformCommonBase(context, entryPoint, programObject, location, count,
+                                     &uniform) &&
+           ValidateUniformValue(context, entryPoint, valueType, uniform->type);
+}
+
+bool ValidateUniform1iv(const Context *context,
+                        angle::EntryPoint entryPoint,
+                        UniformLocation location,
+                        GLsizei count,
+                        const GLint *value)
+{
+    const LinkedUniform *uniform = nullptr;
+    Program *programObject       = context->getActiveLinkedProgram();
+    return ValidateUniformCommonBase(context, entryPoint, programObject, location, count,
+                                     &uniform) &&
+           ValidateUniform1ivValue(context, entryPoint, uniform->type, count, value);
+}
+
+bool ValidateUniformMatrix(const Context *context,
+                           angle::EntryPoint entryPoint,
+                           GLenum valueType,
+                           UniformLocation location,
+                           GLsizei count,
+                           GLboolean transpose)
+{
+    if (ConvertToBool(transpose) && context->getClientMajorVersion() < 3)
+    {
+        context->validationError(entryPoint, GL_INVALID_VALUE, kES3Required);
+        return false;
+    }
+
+    const LinkedUniform *uniform = nullptr;
+    Program *programObject       = context->getActiveLinkedProgram();
+    return ValidateUniformCommonBase(context, entryPoint, programObject, location, count,
+                                     &uniform) &&
+           ValidateUniformMatrixValue(context, entryPoint, valueType, uniform->type);
+}
+
+bool ValidateStateQuery(const Context *context,
+                        angle::EntryPoint entryPoint,
+                        GLenum pname,
+                        GLenum *nativeType,
+                        unsigned int *numParams)
+{
+    if (!context->getQueryParameterInfo(pname, nativeType, numParams))
+    {
+        context->validationError(entryPoint, GL_INVALID_ENUM, kInvalidPname);
+        return false;
+    }
+
+    const Caps &caps = context->getCaps();
+
+    if (pname >= GL_DRAW_BUFFER0 && pname <= GL_DRAW_BUFFER15)
+    {
+        int colorAttachment = (pname - GL_DRAW_BUFFER0);
+
+        if (colorAttachment >= caps.maxDrawBuffers)
+        {
+            context->validationError(entryPoint, GL_INVALID_OPERATION, kIndexExceedsMaxDrawBuffer);
+            return false;
+        }
+    }
+
+    switch (pname)
+    {
+        case GL_TEXTURE_BINDING_2D:
+        case GL_TEXTURE_BINDING_CUBE_MAP:
+        case GL_TEXTURE_BINDING_3D:
+        case GL_TEXTURE_BINDING_2D_ARRAY:
+        case GL_TEXTURE_BINDING_2D_MULTISAMPLE:
+            break;
+        case GL_TEXTURE_BINDING_2D_MULTISAMPLE_ARRAY:
+            if (!context->getExtensions().textureStorageMultisample2dArrayOES)
+            {
+                context->validationError(entryPoint, GL_INVALID_ENUM,
+                                         kMultisampleArrayExtensionRequired);
+                return false;
+            }
+            break;
+        case GL_TEXTURE_BINDING_RECTANGLE_ANGLE:
+            if (!context->getExtensions().textureRectangleANGLE)
+            {
+                context->validationErrorF(entryPoint, GL_INVALID_ENUM, kEnumNotSupported, pname);
+                return false;
+            }
+            break;
+        case GL_TEXTURE_BINDING_EXTERNAL_OES:
+            if (!context->getExtensions().EGLStreamConsumerExternalNV &&
+                !context->getExtensions().EGLImageExternalOES)
+            {
+                context->validationErrorF(entryPoint, GL_INVALID_ENUM, kEnumNotSupported, pname);
+                return false;
+            }
+            break;
+        case GL_TEXTURE_BUFFER_BINDING:
+        case GL_TEXTURE_BINDING_BUFFER:
+        case GL_TEXTURE_BUFFER_OFFSET_ALIGNMENT:
+        case GL_MAX_TEXTURE_BUFFER_SIZE:
+            if (context->getClientVersion() < Version(3, 2) &&
+                !context->getExtensions().textureBufferAny())
+            {
+                context->validationError(entryPoint, GL_INVALID_ENUM,
+                                         kTextureBufferExtensionNotAvailable);
+                return false;
+            }
+            break;
+
+        case GL_IMPLEMENTATION_COLOR_READ_TYPE:
+        case GL_IMPLEMENTATION_COLOR_READ_FORMAT:
+        {
+            Framebuffer *readFramebuffer = context->getState().getReadFramebuffer();
+            ASSERT(readFramebuffer);
+
+            if (!ValidateFramebufferComplete<GL_INVALID_OPERATION>(context, entryPoint,
+                                                                   readFramebuffer))
+            {
+                return false;
+            }
+
+            if (readFramebuffer->getReadBufferState() == GL_NONE)
+            {
+                context->validationError(entryPoint, GL_INVALID_OPERATION, kReadBufferNone);
+                return false;
+            }
+
+            const FramebufferAttachment *attachment = readFramebuffer->getReadColorAttachment();
+            if (!attachment)
+            {
+                context->validationError(entryPoint, GL_INVALID_OPERATION, kReadBufferNotAttached);
+                return false;
+            }
+        }
+        break;
+
+        case GL_PRIMITIVE_BOUNDING_BOX:
+            if (!context->getExtensions().primitiveBoundingBoxAny())
+            {
+                context->validationError(entryPoint, GL_INVALID_ENUM, kExtensionNotEnabled);
+                return false;
+            }
+            break;
+
+        case GL_SHADING_RATE_QCOM:
+            if (!context->getExtensions().shadingRateQCOM)
+            {
+                context->validationError(entryPoint, GL_INVALID_ENUM, kExtensionNotEnabled);
+                return false;
+            }
+            break;
+
+        default:
+            break;
+    }
+
+    // pname is valid, but there are no parameters to return
+    if (*numParams == 0)
+    {
+        return false;
+    }
+
+    return true;
+}
+
+bool ValidateGetBooleanvRobustANGLE(const Context *context,
+                                    angle::EntryPoint entryPoint,
+                                    GLenum pname,
+                                    GLsizei bufSize,
+                                    const GLsizei *length,
+                                    const GLboolean *params)
+{
+    GLenum nativeType;
+    unsigned int numParams = 0;
+
+    if (!ValidateRobustStateQuery(context, entryPoint, pname, bufSize, &nativeType, &numParams))
+    {
+        return false;
+    }
+
+    SetRobustLengthParam(length, numParams);
+
+    return true;
+}
+
+bool ValidateGetFloatvRobustANGLE(const Context *context,
+                                  angle::EntryPoint entryPoint,
+                                  GLenum pname,
+                                  GLsizei bufSize,
+                                  const GLsizei *length,
+                                  const GLfloat *params)
+{
+    GLenum nativeType;
+    unsigned int numParams = 0;
+
+    if (!ValidateRobustStateQuery(context, entryPoint, pname, bufSize, &nativeType, &numParams))
+    {
+        return false;
+    }
+
+    SetRobustLengthParam(length, numParams);
+
+    return true;
+}
+
+bool ValidateGetIntegervRobustANGLE(const Context *context,
+                                    angle::EntryPoint entryPoint,
+                                    GLenum pname,
+                                    GLsizei bufSize,
+                                    const GLsizei *length,
+                                    const GLint *data)
+{
+    GLenum nativeType;
+    unsigned int numParams = 0;
+
+    if (!ValidateRobustStateQuery(context, entryPoint, pname, bufSize, &nativeType, &numParams))
+    {
+        return false;
+    }
+
+    SetRobustLengthParam(length, numParams);
+
+    return true;
+}
+
+bool ValidateGetInteger64vRobustANGLE(const Context *context,
+                                      angle::EntryPoint entryPoint,
+                                      GLenum pname,
+                                      GLsizei bufSize,
+                                      const GLsizei *length,
+                                      GLint64 *data)
+{
+    GLenum nativeType;
+    unsigned int numParams = 0;
+
+    if (!ValidateRobustStateQuery(context, entryPoint, pname, bufSize, &nativeType, &numParams))
+    {
+        return false;
+    }
+
+    if (nativeType == GL_INT_64_ANGLEX)
+    {
+        CastStateValues(context, nativeType, pname, numParams, data);
+        return false;
+    }
+
+    SetRobustLengthParam(length, numParams);
+    return true;
+}
+
+bool ValidateRobustStateQuery(const Context *context,
+                              angle::EntryPoint entryPoint,
+                              GLenum pname,
+                              GLsizei bufSize,
+                              GLenum *nativeType,
+                              unsigned int *numParams)
+{
+    if (!ValidateRobustEntryPoint(context, entryPoint, bufSize))
+    {
+        return false;
+    }
+
+    if (!ValidateStateQuery(context, entryPoint, pname, nativeType, numParams))
+    {
+        return false;
+    }
+
+    if (!ValidateRobustBufferSize(context, entryPoint, bufSize, *numParams))
+    {
+        return false;
+    }
+
+    return true;
+}
+
+bool ValidateCopyImageSubDataTarget(const Context *context,
+                                    angle::EntryPoint entryPoint,
+                                    GLuint name,
+                                    GLenum target)
+{
+    // From EXT_copy_image: INVALID_ENUM is generated if either <srcTarget> or <dstTarget> is not
+    // RENDERBUFFER or a valid non - proxy texture target, is TEXTURE_BUFFER, or is one of the
+    // cubemap face selectors described in table 3.17, or if the target does not match the type of
+    // the object. INVALID_VALUE is generated if either <srcName> or <dstName> does not correspond
+    // to a valid renderbuffer or texture object according to the corresponding target parameter.
+    switch (target)
+    {
+        case GL_RENDERBUFFER:
+        {
+            RenderbufferID renderbuffer = PackParam<RenderbufferID>(name);
+            if (!context->isRenderbuffer(renderbuffer))
+            {
+                context->validationError(entryPoint, GL_INVALID_VALUE, kInvalidRenderbufferName);
+                return false;
+            }
+            break;
+        }
+        case GL_TEXTURE_2D:
+        case GL_TEXTURE_3D:
+        case GL_TEXTURE_2D_ARRAY:
+        case GL_TEXTURE_CUBE_MAP:
+        case GL_TEXTURE_CUBE_MAP_ARRAY_EXT:
+        {
+            TextureID texture = PackParam<TextureID>(name);
+            if (!context->isTexture(texture))
+            {
+                context->validationError(entryPoint, GL_INVALID_VALUE, kInvalidTextureName);
+                return false;
+            }
+
+            Texture *textureObject = context->getTexture(texture);
+            if (textureObject && textureObject->getType() != PackParam<TextureType>(target))
+            {
+                context->validationError(entryPoint, GL_INVALID_ENUM, err::kTextureTypeMismatch);
+                return false;
+            }
+            break;
+        }
+        default:
+            context->validationError(entryPoint, GL_INVALID_ENUM, kInvalidTarget);
+            return false;
+    }
+
+    return true;
+}
+
+bool ValidateCopyImageSubDataLevel(const Context *context,
+                                   angle::EntryPoint entryPoint,
+                                   GLenum target,
+                                   GLint level)
+{
+    switch (target)
+    {
+        case GL_RENDERBUFFER:
+        {
+            if (level != 0)
+            {
+                context->validationError(entryPoint, GL_INVALID_VALUE, kInvalidMipLevel);
+                return false;
+            }
+            break;
+        }
+        case GL_TEXTURE_2D:
+        case GL_TEXTURE_3D:
+        case GL_TEXTURE_2D_ARRAY:
+        case GL_TEXTURE_CUBE_MAP:
+        case GL_TEXTURE_CUBE_MAP_ARRAY_EXT:
+        {
+            if (!ValidMipLevel(context, PackParam<TextureType>(target), level))
+            {
+                context->validationError(entryPoint, GL_INVALID_VALUE, kInvalidMipLevel);
+                return false;
+            }
+            break;
+        }
+        default:
+            context->validationError(entryPoint, GL_INVALID_ENUM, kInvalidTarget);
+            return false;
+    }
+
+    return true;
+}
+
+bool ValidateCopyImageSubDataTargetRegion(const Context *context,
+                                          angle::EntryPoint entryPoint,
+                                          GLuint name,
+                                          GLenum target,
+                                          GLint level,
+                                          GLint offsetX,
+                                          GLint offsetY,
+                                          GLint offsetZ,
+                                          GLsizei width,
+                                          GLsizei height,
+                                          GLsizei *samples)
+{
+    // INVALID_VALUE is generated if the dimensions of the either subregion exceeds the boundaries
+    // of the corresponding image object.
+    if (offsetX < 0 || offsetY < 0 || offsetZ < 0)
+    {
+        context->validationError(entryPoint, GL_INVALID_VALUE, kNegativeOffset);
+        return false;
+    }
+
+    if (target == GL_RENDERBUFFER)
+    {
+        // INVALID_VALUE is generated if the dimensions of the either subregion exceeds the
+        // boundaries of the corresponding image object
+        Renderbuffer *buffer = context->getRenderbuffer(PackParam<RenderbufferID>(name));
+        if ((buffer->getWidth() - offsetX < width) || (buffer->getHeight() - offsetY < height))
+        {
+            context->validationError(entryPoint, GL_INVALID_VALUE, kSourceTextureTooSmall);
+            return false;
+        }
+    }
+    else
+    {
+        Texture *texture = context->getTexture(PackParam<TextureID>(name));
+
+        // INVALID_OPERATION is generated if either object is a texture and the texture is not
+        // complete
+        // This will handle the texture completeness check. Note that this ignores format-based
+        // compleness rules.
+        if (!texture->isSamplerCompleteForCopyImage(context, nullptr))
+        {
+            context->validationError(entryPoint, GL_INVALID_OPERATION, kNotTextureComplete);
+            return false;
+        }
+
+        GLenum textureTargetToUse = target;
+        if (target == GL_TEXTURE_CUBE_MAP)
+        {
+            // Use GL_TEXTURE_CUBE_MAP_POSITIVE_X to properly gather the textureWidth/textureHeight
+            textureTargetToUse = GL_TEXTURE_CUBE_MAP_POSITIVE_X;
+        }
+
+        const GLsizei textureWidth = static_cast<GLsizei>(
+            texture->getWidth(PackParam<TextureTarget>(textureTargetToUse), level));
+        const GLsizei textureHeight = static_cast<GLsizei>(
+            texture->getHeight(PackParam<TextureTarget>(textureTargetToUse), level));
+
+        // INVALID_VALUE is generated if the dimensions of the either subregion exceeds the
+        // boundaries of the corresponding image object
+        if ((textureWidth - offsetX < width) || (textureHeight - offsetY < height))
+        {
+            context->validationError(entryPoint, GL_INVALID_VALUE, kSourceTextureTooSmall);
+            return false;
+        }
+
+        *samples = texture->getSamples(PackParam<TextureTarget>(textureTargetToUse), level);
+        *samples = (*samples == 0) ? 1 : *samples;
+    }
+
+    return true;
+}
+
+bool ValidateCompressedRegion(const Context *context,
+                              angle::EntryPoint entryPoint,
+                              const InternalFormat &formatInfo,
+                              GLsizei width,
+                              GLsizei height)
+{
+    ASSERT(formatInfo.compressed);
+
+    // INVALID_VALUE is generated if the image format is compressed and the dimensions of the
+    // subregion fail to meet the alignment constraints of the format.
+    if ((width % formatInfo.compressedBlockWidth != 0) ||
+        (height % formatInfo.compressedBlockHeight != 0))
+    {
+        context->validationError(entryPoint, GL_INVALID_VALUE, kInvalidCompressedRegionSize);
+        return false;
+    }
+
+    return true;
+}
+
+const InternalFormat &GetTargetFormatInfo(const Context *context,
+                                          angle::EntryPoint entryPoint,
+                                          GLuint name,
+                                          GLenum target,
+                                          GLint level)
+{
+    static const InternalFormat defaultInternalFormat;
+
+    switch (target)
+    {
+        case GL_RENDERBUFFER:
+        {
+            Renderbuffer *buffer = context->getRenderbuffer(PackParam<RenderbufferID>(name));
+            return *buffer->getFormat().info;
+        }
+        case GL_TEXTURE_2D:
+        case GL_TEXTURE_3D:
+        case GL_TEXTURE_2D_ARRAY:
+        case GL_TEXTURE_CUBE_MAP:
+        case GL_TEXTURE_CUBE_MAP_ARRAY_EXT:
+        {
+            Texture *texture          = context->getTexture(PackParam<TextureID>(name));
+            GLenum textureTargetToUse = target;
+
+            if (target == GL_TEXTURE_CUBE_MAP)
+            {
+                // Use GL_TEXTURE_CUBE_MAP_POSITIVE_X to properly gather the
+                // textureWidth/textureHeight
+                textureTargetToUse = GL_TEXTURE_CUBE_MAP_POSITIVE_X;
+            }
+            return *texture->getFormat(PackParam<TextureTarget>(textureTargetToUse), level).info;
+        }
+        default:
+            context->validationError(entryPoint, GL_INVALID_ENUM, kInvalidTarget);
+            return defaultInternalFormat;
+    }
+}
+
+bool ValidateCopyMixedFormatCompatible(GLenum uncompressedFormat, GLenum compressedFormat)
+{
+    // Validates mixed format compatibility (uncompressed and compressed) from Table 4.X.1 of the
+    // EXT_copy_image spec.
+    switch (compressedFormat)
+    {
+        case GL_COMPRESSED_RGBA_S3TC_DXT3_EXT:
+        case GL_COMPRESSED_SRGB_ALPHA_S3TC_DXT3_EXT:
+        case GL_COMPRESSED_RGBA_S3TC_DXT5_EXT:
+        case GL_COMPRESSED_SRGB_ALPHA_S3TC_DXT5_EXT:
+        case GL_COMPRESSED_RED_GREEN_RGTC2_EXT:
+        case GL_COMPRESSED_SIGNED_RED_GREEN_RGTC2_EXT:
+        case GL_COMPRESSED_RGBA_BPTC_UNORM_EXT:
+        case GL_COMPRESSED_SRGB_ALPHA_BPTC_UNORM_EXT:
+        case GL_COMPRESSED_RGB_BPTC_SIGNED_FLOAT_EXT:
+        case GL_COMPRESSED_RGB_BPTC_UNSIGNED_FLOAT_EXT:
+        case GL_COMPRESSED_RGBA8_ETC2_EAC:
+        case GL_COMPRESSED_SRGB8_ALPHA8_ETC2_EAC:
+        case GL_COMPRESSED_RG11_EAC:
+        case GL_COMPRESSED_SIGNED_RG11_EAC:
+        case GL_COMPRESSED_RGBA_ASTC_4x4_KHR:
+        case GL_COMPRESSED_RGBA_ASTC_5x4_KHR:
+        case GL_COMPRESSED_RGBA_ASTC_5x5_KHR:
+        case GL_COMPRESSED_RGBA_ASTC_6x5_KHR:
+        case GL_COMPRESSED_RGBA_ASTC_6x6_KHR:
+        case GL_COMPRESSED_RGBA_ASTC_8x5_KHR:
+        case GL_COMPRESSED_RGBA_ASTC_8x6_KHR:
+        case GL_COMPRESSED_RGBA_ASTC_8x8_KHR:
+        case GL_COMPRESSED_RGBA_ASTC_10x5_KHR:
+        case GL_COMPRESSED_RGBA_ASTC_10x6_KHR:
+        case GL_COMPRESSED_RGBA_ASTC_10x8_KHR:
+        case GL_COMPRESSED_RGBA_ASTC_10x10_KHR:
+        case GL_COMPRESSED_RGBA_ASTC_12x10_KHR:
+        case GL_COMPRESSED_RGBA_ASTC_12x12_KHR:
+        case GL_COMPRESSED_SRGB8_ALPHA8_ASTC_4x4_KHR:
+        case GL_COMPRESSED_SRGB8_ALPHA8_ASTC_5x4_KHR:
+        case GL_COMPRESSED_SRGB8_ALPHA8_ASTC_5x5_KHR:
+        case GL_COMPRESSED_SRGB8_ALPHA8_ASTC_6x5_KHR:
+        case GL_COMPRESSED_SRGB8_ALPHA8_ASTC_6x6_KHR:
+        case GL_COMPRESSED_SRGB8_ALPHA8_ASTC_8x5_KHR:
+        case GL_COMPRESSED_SRGB8_ALPHA8_ASTC_8x6_KHR:
+        case GL_COMPRESSED_SRGB8_ALPHA8_ASTC_8x8_KHR:
+        case GL_COMPRESSED_SRGB8_ALPHA8_ASTC_10x5_KHR:
+        case GL_COMPRESSED_SRGB8_ALPHA8_ASTC_10x6_KHR:
+        case GL_COMPRESSED_SRGB8_ALPHA8_ASTC_10x8_KHR:
+        case GL_COMPRESSED_SRGB8_ALPHA8_ASTC_10x10_KHR:
+        case GL_COMPRESSED_SRGB8_ALPHA8_ASTC_12x10_KHR:
+        case GL_COMPRESSED_SRGB8_ALPHA8_ASTC_12x12_KHR:
+        case GL_COMPRESSED_RGBA_ASTC_3x3x3_OES:
+        case GL_COMPRESSED_RGBA_ASTC_4x3x3_OES:
+        case GL_COMPRESSED_RGBA_ASTC_4x4x3_OES:
+        case GL_COMPRESSED_RGBA_ASTC_4x4x4_OES:
+        case GL_COMPRESSED_RGBA_ASTC_5x4x4_OES:
+        case GL_COMPRESSED_RGBA_ASTC_5x5x4_OES:
+        case GL_COMPRESSED_RGBA_ASTC_5x5x5_OES:
+        case GL_COMPRESSED_RGBA_ASTC_6x5x5_OES:
+        case GL_COMPRESSED_RGBA_ASTC_6x6x5_OES:
+        case GL_COMPRESSED_RGBA_ASTC_6x6x6_OES:
+        case GL_COMPRESSED_SRGB8_ALPHA8_ASTC_3x3x3_OES:
+        case GL_COMPRESSED_SRGB8_ALPHA8_ASTC_4x3x3_OES:
+        case GL_COMPRESSED_SRGB8_ALPHA8_ASTC_4x4x3_OES:
+        case GL_COMPRESSED_SRGB8_ALPHA8_ASTC_4x4x4_OES:
+        case GL_COMPRESSED_SRGB8_ALPHA8_ASTC_5x4x4_OES:
+        case GL_COMPRESSED_SRGB8_ALPHA8_ASTC_5x5x4_OES:
+        case GL_COMPRESSED_SRGB8_ALPHA8_ASTC_5x5x5_OES:
+        case GL_COMPRESSED_SRGB8_ALPHA8_ASTC_6x5x5_OES:
+        case GL_COMPRESSED_SRGB8_ALPHA8_ASTC_6x6x5_OES:
+        case GL_COMPRESSED_SRGB8_ALPHA8_ASTC_6x6x6_OES:
+        {
+            switch (uncompressedFormat)
+            {
+                case GL_RGBA32UI:
+                case GL_RGBA32I:
+                case GL_RGBA32F:
+                    return true;
+                default:
+                    return false;
+            }
+        }
+        case GL_COMPRESSED_RGB_S3TC_DXT1_EXT:
+        case GL_COMPRESSED_SRGB_S3TC_DXT1_EXT:
+        case GL_COMPRESSED_RGBA_S3TC_DXT1_EXT:
+        case GL_COMPRESSED_SRGB_ALPHA_S3TC_DXT1_EXT:
+        case GL_COMPRESSED_RED_RGTC1_EXT:
+        case GL_COMPRESSED_SIGNED_RED_RGTC1_EXT:
+        case GL_COMPRESSED_RGB8_ETC2:
+        case GL_COMPRESSED_SRGB8_ETC2:
+        case GL_COMPRESSED_R11_EAC:
+        case GL_COMPRESSED_SIGNED_R11_EAC:
+        case GL_COMPRESSED_RGB8_PUNCHTHROUGH_ALPHA1_ETC2:
+        case GL_COMPRESSED_SRGB8_PUNCHTHROUGH_ALPHA1_ETC2:
+        {
+            switch (uncompressedFormat)
+            {
+                case GL_RGBA16UI:
+                case GL_RGBA16I:
+                case GL_RGBA16F:
+                case GL_RG32UI:
+                case GL_RG32I:
+                case GL_RG32F:
+                    return true;
+                default:
+                    return false;
+            }
+        }
+        default:
+            break;
+    }
+
+    return false;
+}
+
+bool ValidateCopyCompressedFormatCompatible(const InternalFormat &srcFormatInfo,
+                                            const InternalFormat &dstFormatInfo)
+{
+    // Validates compressed format compatibility from Table 4.X.2 of the EXT_copy_image spec.
+
+    ASSERT(srcFormatInfo.internalFormat != dstFormatInfo.internalFormat);
+
+    const GLenum srcFormat = srcFormatInfo.internalFormat;
+    const GLenum dstFormat = dstFormatInfo.internalFormat;
+
+    switch (srcFormat)
+    {
+        case GL_COMPRESSED_RED_RGTC1_EXT:
+            return (dstFormat == GL_COMPRESSED_SIGNED_RED_RGTC1_EXT);
+        case GL_COMPRESSED_SIGNED_RED_RGTC1_EXT:
+            return (dstFormat == GL_COMPRESSED_RED_RGTC1_EXT);
+        case GL_COMPRESSED_RED_GREEN_RGTC2_EXT:
+            return (dstFormat == GL_COMPRESSED_SIGNED_RED_GREEN_RGTC2_EXT);
+        case GL_COMPRESSED_SIGNED_RED_GREEN_RGTC2_EXT:
+            return (dstFormat == GL_COMPRESSED_RED_GREEN_RGTC2_EXT);
+        case GL_COMPRESSED_RGB_BPTC_SIGNED_FLOAT_EXT:
+            return (dstFormat == GL_COMPRESSED_RGB_BPTC_UNSIGNED_FLOAT_EXT);
+        case GL_COMPRESSED_RGB_BPTC_UNSIGNED_FLOAT_EXT:
+            return (dstFormat == GL_COMPRESSED_RGB_BPTC_SIGNED_FLOAT_EXT);
+        case GL_COMPRESSED_R11_EAC:
+            return (dstFormat == GL_COMPRESSED_SIGNED_R11_EAC);
+        case GL_COMPRESSED_SIGNED_R11_EAC:
+            return (dstFormat == GL_COMPRESSED_R11_EAC);
+        case GL_COMPRESSED_RG11_EAC:
+            return (dstFormat == GL_COMPRESSED_SIGNED_RG11_EAC);
+        case GL_COMPRESSED_SIGNED_RG11_EAC:
+            return (dstFormat == GL_COMPRESSED_RG11_EAC);
+        default:
+            break;
+    }
+
+    // Since they can't be the same format and are both compressed formats, one must be linear and
+    // the other nonlinear.
+    if (srcFormatInfo.colorEncoding == dstFormatInfo.colorEncoding)
+    {
+        return false;
+    }
+
+    const GLenum linearFormat = (srcFormatInfo.colorEncoding == GL_LINEAR) ? srcFormat : dstFormat;
+    const GLenum nonLinearFormat =
+        (srcFormatInfo.colorEncoding != GL_LINEAR) ? srcFormat : dstFormat;
+
+    switch (linearFormat)
+    {
+        case GL_COMPRESSED_RGBA_BPTC_UNORM_EXT:
+            return (nonLinearFormat == GL_COMPRESSED_SRGB_ALPHA_BPTC_UNORM_EXT);
+        case GL_COMPRESSED_RGB_S3TC_DXT1_EXT:
+            return (nonLinearFormat == GL_COMPRESSED_SRGB_S3TC_DXT1_EXT);
+        case GL_COMPRESSED_RGBA_S3TC_DXT1_EXT:
+            return (nonLinearFormat == GL_COMPRESSED_SRGB_ALPHA_S3TC_DXT1_EXT);
+        case GL_COMPRESSED_RGBA_S3TC_DXT3_EXT:
+            return (nonLinearFormat == GL_COMPRESSED_SRGB_ALPHA_S3TC_DXT3_EXT);
+        case GL_COMPRESSED_RGBA_S3TC_DXT5_EXT:
+            return (nonLinearFormat == GL_COMPRESSED_SRGB_ALPHA_S3TC_DXT5_EXT);
+        case GL_COMPRESSED_RGB8_ETC2:
+            return (nonLinearFormat == GL_COMPRESSED_SRGB8_ETC2);
+        case GL_COMPRESSED_RGB8_PUNCHTHROUGH_ALPHA1_ETC2:
+            return (nonLinearFormat == GL_COMPRESSED_SRGB8_PUNCHTHROUGH_ALPHA1_ETC2);
+        case GL_COMPRESSED_RGBA8_ETC2_EAC:
+            return (nonLinearFormat == GL_COMPRESSED_SRGB8_ALPHA8_ETC2_EAC);
+        case GL_COMPRESSED_RGBA_ASTC_4x4_KHR:
+            return (nonLinearFormat == GL_COMPRESSED_SRGB8_ALPHA8_ASTC_4x4_KHR);
+        case GL_COMPRESSED_RGBA_ASTC_5x4_KHR:
+            return (nonLinearFormat == GL_COMPRESSED_SRGB8_ALPHA8_ASTC_5x4_KHR);
+        case GL_COMPRESSED_RGBA_ASTC_5x5_KHR:
+            return (nonLinearFormat == GL_COMPRESSED_SRGB8_ALPHA8_ASTC_5x5_KHR);
+        case GL_COMPRESSED_RGBA_ASTC_6x5_KHR:
+            return (nonLinearFormat == GL_COMPRESSED_SRGB8_ALPHA8_ASTC_6x5_KHR);
+        case GL_COMPRESSED_RGBA_ASTC_6x6_KHR:
+            return (nonLinearFormat == GL_COMPRESSED_SRGB8_ALPHA8_ASTC_6x6_KHR);
+        case GL_COMPRESSED_RGBA_ASTC_8x5_KHR:
+            return (nonLinearFormat == GL_COMPRESSED_SRGB8_ALPHA8_ASTC_8x5_KHR);
+        case GL_COMPRESSED_RGBA_ASTC_8x6_KHR:
+            return (nonLinearFormat == GL_COMPRESSED_SRGB8_ALPHA8_ASTC_8x6_KHR);
+        case GL_COMPRESSED_RGBA_ASTC_8x8_KHR:
+            return (nonLinearFormat == GL_COMPRESSED_SRGB8_ALPHA8_ASTC_8x8_KHR);
+        case GL_COMPRESSED_RGBA_ASTC_10x5_KHR:
+            return (nonLinearFormat == GL_COMPRESSED_SRGB8_ALPHA8_ASTC_10x5_KHR);
+        case GL_COMPRESSED_RGBA_ASTC_10x6_KHR:
+            return (nonLinearFormat == GL_COMPRESSED_SRGB8_ALPHA8_ASTC_10x6_KHR);
+        case GL_COMPRESSED_RGBA_ASTC_10x8_KHR:
+            return (nonLinearFormat == GL_COMPRESSED_SRGB8_ALPHA8_ASTC_10x8_KHR);
+        case GL_COMPRESSED_RGBA_ASTC_10x10_KHR:
+            return (nonLinearFormat == GL_COMPRESSED_SRGB8_ALPHA8_ASTC_10x10_KHR);
+        case GL_COMPRESSED_RGBA_ASTC_12x10_KHR:
+            return (nonLinearFormat == GL_COMPRESSED_SRGB8_ALPHA8_ASTC_12x10_KHR);
+        case GL_COMPRESSED_RGBA_ASTC_12x12_KHR:
+            return (nonLinearFormat == GL_COMPRESSED_SRGB8_ALPHA8_ASTC_12x12_KHR);
+        case GL_COMPRESSED_RGBA_ASTC_3x3x3_OES:
+            return (nonLinearFormat == GL_COMPRESSED_SRGB8_ALPHA8_ASTC_3x3x3_OES);
+        case GL_COMPRESSED_RGBA_ASTC_4x3x3_OES:
+            return (nonLinearFormat == GL_COMPRESSED_SRGB8_ALPHA8_ASTC_4x3x3_OES);
+        case GL_COMPRESSED_RGBA_ASTC_4x4x3_OES:
+            return (nonLinearFormat == GL_COMPRESSED_SRGB8_ALPHA8_ASTC_4x4x3_OES);
+        case GL_COMPRESSED_RGBA_ASTC_4x4x4_OES:
+            return (nonLinearFormat == GL_COMPRESSED_SRGB8_ALPHA8_ASTC_4x4x4_OES);
+        case GL_COMPRESSED_RGBA_ASTC_5x4x4_OES:
+            return (nonLinearFormat == GL_COMPRESSED_SRGB8_ALPHA8_ASTC_5x4x4_OES);
+        case GL_COMPRESSED_RGBA_ASTC_5x5x4_OES:
+            return (nonLinearFormat == GL_COMPRESSED_SRGB8_ALPHA8_ASTC_5x5x4_OES);
+        case GL_COMPRESSED_RGBA_ASTC_5x5x5_OES:
+            return (nonLinearFormat == GL_COMPRESSED_SRGB8_ALPHA8_ASTC_5x5x5_OES);
+        case GL_COMPRESSED_RGBA_ASTC_6x5x5_OES:
+            return (nonLinearFormat == GL_COMPRESSED_SRGB8_ALPHA8_ASTC_6x5x5_OES);
+        case GL_COMPRESSED_RGBA_ASTC_6x6x5_OES:
+            return (nonLinearFormat == GL_COMPRESSED_SRGB8_ALPHA8_ASTC_6x6x5_OES);
+        case GL_COMPRESSED_RGBA_ASTC_6x6x6_OES:
+            return (nonLinearFormat == GL_COMPRESSED_SRGB8_ALPHA8_ASTC_6x6x6_OES);
+        default:
+            break;
+    }
+
+    return false;
+}
+
+bool ValidateCopyFormatCompatible(const InternalFormat &srcFormatInfo,
+                                  const InternalFormat &dstFormatInfo)
+{
+    // Matching source and destination formats are compatible.
+    if (srcFormatInfo.internalFormat == dstFormatInfo.internalFormat)
+    {
+        return true;
+    }
+
+    if (srcFormatInfo.compressed != dstFormatInfo.compressed)
+    {
+        GLenum uncompressedFormat = (!srcFormatInfo.compressed) ? srcFormatInfo.internalFormat
+                                                                : dstFormatInfo.internalFormat;
+        GLenum compressedFormat   = (srcFormatInfo.compressed) ? srcFormatInfo.internalFormat
+                                                               : dstFormatInfo.internalFormat;
+
+        return ValidateCopyMixedFormatCompatible(uncompressedFormat, compressedFormat);
+    }
+
+    if (!srcFormatInfo.compressed)
+    {
+        // Source and destination are uncompressed formats.
+        return (srcFormatInfo.pixelBytes == dstFormatInfo.pixelBytes);
+    }
+
+    return ValidateCopyCompressedFormatCompatible(srcFormatInfo, dstFormatInfo);
+}
+
+bool ValidateCopyImageSubDataBase(const Context *context,
+                                  angle::EntryPoint entryPoint,
+                                  GLuint srcName,
+                                  GLenum srcTarget,
+                                  GLint srcLevel,
+                                  GLint srcX,
+                                  GLint srcY,
+                                  GLint srcZ,
+                                  GLuint dstName,
+                                  GLenum dstTarget,
+                                  GLint dstLevel,
+                                  GLint dstX,
+                                  GLint dstY,
+                                  GLint dstZ,
+                                  GLsizei srcWidth,
+                                  GLsizei srcHeight,
+                                  GLsizei srcDepth)
+{
+    // INVALID_VALUE is generated if the dimensions of the either subregion exceeds the boundaries
+    // of the corresponding image object
+    if ((srcWidth < 0) || (srcHeight < 0) || (srcDepth < 0))
+    {
+        context->validationError(entryPoint, GL_INVALID_VALUE, kNegativeSize);
+        return false;
+    }
+
+    if (!ValidateCopyImageSubDataTarget(context, entryPoint, srcName, srcTarget))
+    {
+        return false;
+    }
+    if (!ValidateCopyImageSubDataTarget(context, entryPoint, dstName, dstTarget))
+    {
+        return false;
+    }
+
+    if (!ValidateCopyImageSubDataLevel(context, entryPoint, srcTarget, srcLevel))
+    {
+        return false;
+    }
+    if (!ValidateCopyImageSubDataLevel(context, entryPoint, dstTarget, dstLevel))
+    {
+        return false;
+    }
+
+    const InternalFormat &srcFormatInfo =
+        GetTargetFormatInfo(context, entryPoint, srcName, srcTarget, srcLevel);
+    const InternalFormat &dstFormatInfo =
+        GetTargetFormatInfo(context, entryPoint, dstName, dstTarget, dstLevel);
+    GLsizei dstWidth   = srcWidth;
+    GLsizei dstHeight  = srcHeight;
+    GLsizei srcSamples = 1;
+    GLsizei dstSamples = 1;
+
+    if (srcFormatInfo.internalFormat == GL_NONE || dstFormatInfo.internalFormat == GL_NONE)
+    {
+        context->validationError(entryPoint, GL_INVALID_VALUE, kInvalidTextureLevel);
+        return false;
+    }
+
+    if (!ValidateCopyImageSubDataTargetRegion(context, entryPoint, srcName, srcTarget, srcLevel,
+                                              srcX, srcY, srcZ, srcWidth, srcHeight, &srcSamples))
+    {
+        return false;
+    }
+
+    // When copying from a compressed image to an uncompressed image the image texel dimensions
+    // written to the uncompressed image will be source extent divided by the compressed texel block
+    // dimensions.
+    if ((srcFormatInfo.compressed) && (!dstFormatInfo.compressed))
+    {
+        ASSERT(srcFormatInfo.compressedBlockWidth != 0);
+        ASSERT(srcFormatInfo.compressedBlockHeight != 0);
+
+        dstWidth /= srcFormatInfo.compressedBlockWidth;
+        dstHeight /= srcFormatInfo.compressedBlockHeight;
+    }
+    // When copying from an uncompressed image to a compressed image the image texel dimensions
+    // written to the compressed image will be the source extent multiplied by the compressed texel
+    // block dimensions.
+    else if ((!srcFormatInfo.compressed) && (dstFormatInfo.compressed))
+    {
+        dstWidth *= dstFormatInfo.compressedBlockWidth;
+        dstHeight *= dstFormatInfo.compressedBlockHeight;
+    }
+
+    if (!ValidateCopyImageSubDataTargetRegion(context, entryPoint, dstName, dstTarget, dstLevel,
+                                              dstX, dstY, dstZ, dstWidth, dstHeight, &dstSamples))
+    {
+        return false;
+    }
+
+    bool fillsEntireMip               = false;
+    gl::Texture *dstTexture           = context->getTexture({dstName});
+    gl::TextureTarget dstTargetPacked = gl::PackParam<gl::TextureTarget>(dstTarget);
+    // TODO(http://anglebug.com/5643): Some targets (e.g., GL_TEXTURE_CUBE_MAP, GL_RENDERBUFFER) are
+    // unsupported when used with compressed formats due to gl::PackParam() returning
+    // TextureTarget::InvalidEnum.
+    if (dstTargetPacked != gl::TextureTarget::InvalidEnum)
+    {
+        const gl::Extents &dstExtents = dstTexture->getExtents(dstTargetPacked, dstLevel);
+        fillsEntireMip = dstX == 0 && dstY == 0 && dstZ == 0 && srcWidth == dstExtents.width &&
+                         srcHeight == dstExtents.height && srcDepth == dstExtents.depth;
+    }
+
+    if (srcFormatInfo.compressed && !fillsEntireMip &&
+        !ValidateCompressedRegion(context, entryPoint, srcFormatInfo, srcWidth, srcHeight))
+    {
+        return false;
+    }
+
+    if (dstFormatInfo.compressed && !fillsEntireMip &&
+        !ValidateCompressedRegion(context, entryPoint, dstFormatInfo, dstWidth, dstHeight))
+    {
+        return false;
+    }
+
+    // From EXT_copy_image: INVALID_OPERATION is generated if the source and destination formats
+    // are not compatible, if one image is compressed and the other is uncompressed and the block
+    // size of compressed image is not equal to the texel size of the compressed image.
+    if (!ValidateCopyFormatCompatible(srcFormatInfo, dstFormatInfo))
+    {
+        context->validationError(entryPoint, GL_INVALID_OPERATION, kIncompatibleTextures);
+        return false;
+    }
+
+    // INVALID_OPERATION is generated if the source and destination number of samples do not match
+    if (srcSamples != dstSamples)
+    {
+        context->validationError(entryPoint, GL_INVALID_OPERATION, kSamplesOutOfRange);
+        return false;
+    }
+
+    return true;
+}
+
+bool ValidateCopyTexImageParametersBase(const Context *context,
+                                        angle::EntryPoint entryPoint,
+                                        TextureTarget target,
+                                        GLint level,
+                                        GLenum internalformat,
+                                        bool isSubImage,
+                                        GLint xoffset,
+                                        GLint yoffset,
+                                        GLint zoffset,
+                                        GLint x,
+                                        GLint y,
+                                        GLsizei width,
+                                        GLsizei height,
+                                        GLint border,
+                                        Format *textureFormatOut)
+{
+    TextureType texType = TextureTargetToType(target);
+
+    if (xoffset < 0 || yoffset < 0 || zoffset < 0)
+    {
+        context->validationError(entryPoint, GL_INVALID_VALUE, kNegativeOffset);
+        return false;
+    }
+
+    if (width < 0 || height < 0)
+    {
+        context->validationError(entryPoint, GL_INVALID_VALUE, kNegativeSize);
+        return false;
+    }
+
+    if (std::numeric_limits<GLsizei>::max() - xoffset < width ||
+        std::numeric_limits<GLsizei>::max() - yoffset < height)
+    {
+        context->validationError(entryPoint, GL_INVALID_VALUE, kOffsetOverflow);
+        return false;
+    }
+
+    if (std::numeric_limits<GLint>::max() - width < x ||
+        std::numeric_limits<GLint>::max() - height < y)
+    {
+        context->validationError(entryPoint, GL_INVALID_VALUE, kIntegerOverflow);
+        return false;
+    }
+
+    if (border != 0)
+    {
+        context->validationError(entryPoint, GL_INVALID_VALUE, kInvalidBorder);
+        return false;
+    }
+
+    if (!ValidMipLevel(context, texType, level))
+    {
+        context->validationError(entryPoint, GL_INVALID_VALUE, kInvalidMipLevel);
+        return false;
+    }
+
+    const State &state           = context->getState();
+    Framebuffer *readFramebuffer = state.getReadFramebuffer();
+    if (!ValidateFramebufferComplete(context, entryPoint, readFramebuffer))
+    {
+        return false;
+    }
+
+    // checkReadBufferResourceSamples = true. Treat renderToTexture textures as single sample since
+    // they will be resolved before copying.
+    if (!readFramebuffer->isDefault() &&
+        !ValidateFramebufferNotMultisampled(context, entryPoint, readFramebuffer, true))
+    {
+        return false;
+    }
+
+    if (readFramebuffer->getReadBufferState() == GL_NONE)
+    {
+        context->validationError(entryPoint, GL_INVALID_OPERATION, kReadBufferNone);
+        return false;
+    }
+
+    // WebGL 1.0 [Section 6.26] Reading From a Missing Attachment
+    // In OpenGL ES it is undefined what happens when an operation tries to read from a missing
+    // attachment and WebGL defines it to be an error. We do the check unconditionally as the
+    // situation is an application error that would lead to a crash in ANGLE.
+    const FramebufferAttachment *source = readFramebuffer->getReadColorAttachment();
+    if (source == nullptr)
+    {
+        context->validationError(entryPoint, GL_INVALID_OPERATION, kMissingReadAttachment);
+        return false;
+    }
+
+    if (source->isYUV())
+    {
+        context->validationError(entryPoint, GL_INVALID_OPERATION, kCopyFromYUVFramebuffer);
+        return false;
+    }
+
+    // ANGLE_multiview spec, Revision 1:
+    // Calling CopyTexSubImage3D, CopyTexImage2D, or CopyTexSubImage2D will result in an
+    // INVALID_FRAMEBUFFER_OPERATION error if the multi-view layout of the current read framebuffer
+    // is FRAMEBUFFER_MULTIVIEW_SIDE_BY_SIDE_ANGLE or the number of views in the current read
+    // framebuffer is more than one.
+    if (readFramebuffer->readDisallowedByMultiview())
+    {
+        context->validationError(entryPoint, GL_INVALID_FRAMEBUFFER_OPERATION,
+                                 kMultiviewReadFramebuffer);
+        return false;
+    }
+
+    const Caps &caps = context->getCaps();
+
+    GLint maxDimension = 0;
+    switch (texType)
+    {
+        case TextureType::_2D:
+            maxDimension = caps.max2DTextureSize;
+            break;
+
+        case TextureType::CubeMap:
+        case TextureType::CubeMapArray:
+            maxDimension = caps.maxCubeMapTextureSize;
+            break;
+
+        case TextureType::Rectangle:
+            maxDimension = caps.maxRectangleTextureSize;
+            break;
+
+        case TextureType::_2DArray:
+            maxDimension = caps.max2DTextureSize;
+            break;
+
+        case TextureType::_3D:
+            maxDimension = caps.max3DTextureSize;
+            break;
+
+        default:
+            context->validationError(entryPoint, GL_INVALID_ENUM, kInvalidTextureTarget);
+            return false;
+    }
+
+    Texture *texture = state.getTargetTexture(texType);
+    if (!texture)
+    {
+        context->validationError(entryPoint, GL_INVALID_OPERATION, kTextureNotBound);
+        return false;
+    }
+
+    if (texture->getImmutableFormat() && !isSubImage)
+    {
+        context->validationError(entryPoint, GL_INVALID_OPERATION, kTextureIsImmutable);
+        return false;
+    }
+
+    const InternalFormat &formatInfo =
+        isSubImage ? *texture->getFormat(target, level).info
+                   : GetInternalFormatInfo(internalformat, GL_UNSIGNED_BYTE);
+
+    if (formatInfo.depthBits > 0 || formatInfo.compressed)
+    {
+        context->validationError(entryPoint, GL_INVALID_OPERATION, kInvalidFormat);
+        return false;
+    }
+
+    if (isSubImage)
+    {
+        if (static_cast<size_t>(xoffset + width) > texture->getWidth(target, level) ||
+            static_cast<size_t>(yoffset + height) > texture->getHeight(target, level) ||
+            static_cast<size_t>(zoffset) >= texture->getDepth(target, level))
+        {
+            context->validationError(entryPoint, GL_INVALID_VALUE, kOffsetOverflow);
+            return false;
+        }
+    }
+    else
+    {
+        if ((texType == TextureType::CubeMap || texType == TextureType::CubeMapArray) &&
+            width != height)
+        {
+            context->validationError(entryPoint, GL_INVALID_VALUE, kCubemapIncomplete);
+            return false;
+        }
+
+        if (!formatInfo.textureSupport(context->getClientVersion(), context->getExtensions()))
+        {
+            context->validationErrorF(entryPoint, GL_INVALID_ENUM, kEnumNotSupported,
+                                      internalformat);
+            return false;
+        }
+
+        int maxLevelDimension = (maxDimension >> level);
+        if (static_cast<int>(width) > maxLevelDimension ||
+            static_cast<int>(height) > maxLevelDimension)
+        {
+            context->validationError(entryPoint, GL_INVALID_VALUE, kResourceMaxTextureSize);
+            return false;
+        }
+    }
+
+    // Do not leak the previous texture format for non-subImage case.
+    if (textureFormatOut && isSubImage)
+    {
+        *textureFormatOut = texture->getFormat(target, level);
+    }
+
+    // Detect texture copying feedback loops for WebGL.
+    if (context->isWebGL())
+    {
+        if (readFramebuffer->formsCopyingFeedbackLoopWith(texture->id(), level, zoffset))
+        {
+            context->validationError(entryPoint, GL_INVALID_OPERATION, kFeedbackLoop);
+            return false;
+        }
+    }
+
+    return true;
+}
+
+const char *ValidateProgramPipelineDrawStates(const Context *context,
+                                              const Extensions &extensions,
+                                              ProgramPipeline *programPipeline)
+{
+    for (const ShaderType shaderType : gl::AllShaderTypes())
+    {
+        Program *program = programPipeline->getShaderProgram(shaderType);
+        if (program)
+        {
+            const char *errorMsg = ValidateProgramDrawStates(context, extensions, program);
+            if (errorMsg)
+            {
+                return errorMsg;
+            }
+        }
+    }
+
+    return nullptr;
+}
+
+const char *ValidateProgramPipelineAttachedPrograms(ProgramPipeline *programPipeline)
+{
+    // An INVALID_OPERATION error is generated by any command that transfers vertices to the
+    // GL or launches compute work if the current set of active
+    // program objects cannot be executed, for reasons including:
+    // - There is no current program object specified by UseProgram, there is a current program
+    //    pipeline object, and that object is empty (no executable code is installed for any stage).
+    // - A program object is active for at least one, but not all of the shader
+    // stages that were present when the program was linked.
+    if (!programPipeline->getExecutable().getLinkedShaderStages().any())
+    {
+        return gl::err::kNoExecutableCodeInstalled;
+    }
+    for (const ShaderType shaderType : gl::AllShaderTypes())
+    {
+        Program *shaderProgram = programPipeline->getShaderProgram(shaderType);
+        if (shaderProgram)
+        {
+            ProgramExecutable &executable = shaderProgram->getExecutable();
+            for (const ShaderType programShaderType : executable.getLinkedShaderStages())
+            {
+                if (shaderProgram != programPipeline->getShaderProgram(programShaderType))
+                {
+                    return gl::err::kNotAllStagesOfSeparableProgramUsed;
+                }
+            }
+        }
+    }
+
+    // [EXT_geometry_shader] Section 11.1.gs Geometry Shaders
+    // A non-separable program object or program pipeline object that includes
+    // a geometry shader must also include a vertex shader.
+    // An INVALID_OPERATION error is generated by any command that transfers
+    // vertices to the GL if the current program state has a geometry shader
+    // but no vertex shader.
+    if (!programPipeline->getShaderProgram(ShaderType::Vertex) &&
+        programPipeline->getShaderProgram(ShaderType::Geometry))
+    {
+        return gl::err::kNoActiveGraphicsShaderStage;
+    }
+
+    return nullptr;
+}
+
+// Note all errors returned from this function are INVALID_OPERATION except for the draw framebuffer
+// completeness check.
+const char *ValidateDrawStates(const Context *context)
+{
+    const Extensions &extensions = context->getExtensions();
+    const State &state           = context->getState();
+
+    // WebGL buffers cannot be mapped/unmapped because the MapBufferRange, FlushMappedBufferRange,
+    // and UnmapBuffer entry points are removed from the WebGL 2.0 API.
+    // https://www.khronos.org/registry/webgl/specs/latest/2.0/#5.14
+    VertexArray *vertexArray = state.getVertexArray();
+    ASSERT(vertexArray);
+
+    if (!extensions.webglCompatibilityANGLE && vertexArray->hasInvalidMappedArrayBuffer())
+    {
+        return kBufferMapped;
+    }
+
+    // Note: these separate values are not supported in WebGL, due to D3D's limitations. See
+    // Section 6.10 of the WebGL 1.0 spec.
+    Framebuffer *framebuffer = state.getDrawFramebuffer();
+    ASSERT(framebuffer);
+
+    if (context->getLimitations().noSeparateStencilRefsAndMasks ||
+        extensions.webglCompatibilityANGLE)
+    {
+        ASSERT(framebuffer);
+        const FramebufferAttachment *dsAttachment =
+            framebuffer->getStencilOrDepthStencilAttachment();
+        const GLuint stencilBits = dsAttachment ? dsAttachment->getStencilSize() : 0;
+        ASSERT(stencilBits <= 8);
+
+        const DepthStencilState &depthStencilState = state.getDepthStencilState();
+        if (depthStencilState.stencilTest && stencilBits > 0)
+        {
+            GLuint maxStencilValue = (1 << stencilBits) - 1;
+
+            bool differentRefs =
+                clamp(state.getStencilRef(), 0, static_cast<GLint>(maxStencilValue)) !=
+                clamp(state.getStencilBackRef(), 0, static_cast<GLint>(maxStencilValue));
+            bool differentWritemasks = (depthStencilState.stencilWritemask & maxStencilValue) !=
+                                       (depthStencilState.stencilBackWritemask & maxStencilValue);
+            bool differentMasks = (depthStencilState.stencilMask & maxStencilValue) !=
+                                  (depthStencilState.stencilBackMask & maxStencilValue);
+
+            if (differentRefs || differentWritemasks || differentMasks)
+            {
+                if (!extensions.webglCompatibilityANGLE)
+                {
+                    WARN() << "This ANGLE implementation does not support separate front/back "
+                              "stencil writemasks, reference values, or stencil mask values.";
+                }
+                return kStencilReferenceMaskOrMismatch;
+            }
+        }
+    }
+
+    if (!extensions.floatBlendEXT)
+    {
+        const DrawBufferMask blendEnabledActiveFloat32ColorAttachmentDrawBufferMask =
+            state.getBlendEnabledDrawBufferMask() &
+            framebuffer->getActiveFloat32ColorAttachmentDrawBufferMask();
+        if (blendEnabledActiveFloat32ColorAttachmentDrawBufferMask.any())
+        {
+            return kUnsupportedFloatBlending;
+        }
+    }
+
+    if (context->getLimitations().noSimultaneousConstantColorAndAlphaBlendFunc ||
+        extensions.webglCompatibilityANGLE)
+    {
+        if (state.hasSimultaneousConstantColorAndAlphaBlendFunc())
+        {
+            if (extensions.webglCompatibilityANGLE)
+            {
+                return kInvalidConstantColor;
+            }
+
+            WARN() << kConstantColorAlphaLimitation;
+            return kConstantColorAlphaLimitation;
+        }
+    }
+
+    if (!framebuffer->isComplete(context))
+    {
+        // Note: this error should be generated as INVALID_FRAMEBUFFER_OPERATION.
+        return kDrawFramebufferIncomplete;
+    }
+
+    bool framebufferIsYUV = framebuffer->hasYUVAttachment();
+    if (framebufferIsYUV)
+    {
+        const BlendState &blendState = state.getBlendState();
+        if (!blendState.colorMaskRed || !blendState.colorMaskGreen || !blendState.colorMaskBlue)
+        {
+            // When rendering into a YUV framebuffer, the color mask must have r g and b set to
+            // true.
+            return kInvalidColorMaskForYUV;
+        }
+
+        if (blendState.blend)
+        {
+            // When rendering into a YUV framebuffer, blending must be disabled.
+            return kInvalidBlendStateForYUV;
+        }
+    }
+    else
+    {
+        if (framebuffer->hasExternalTextureAttachment())
+        {
+            // It is an error to render into an external texture that is not YUV.
+            return kExternalTextureAttachmentNotYUV;
+        }
+    }
+
+    // Advanced blend equation can only be enabled for a single render target.
+    const BlendStateExt &blendStateExt = state.getBlendStateExt();
+    if (blendStateExt.getUsesAdvancedBlendEquationMask().any())
+    {
+        const size_t drawBufferCount            = framebuffer->getDrawbufferStateCount();
+        uint32_t advancedBlendRenderTargetCount = 0;
+
+        for (size_t drawBufferIndex : blendStateExt.getUsesAdvancedBlendEquationMask())
+        {
+            if (drawBufferIndex < drawBufferCount &&
+                framebuffer->getDrawBufferState(drawBufferIndex) != GL_NONE &&
+                blendStateExt.getEnabledMask().test(drawBufferIndex) &&
+                blendStateExt.getUsesAdvancedBlendEquationMask().test(drawBufferIndex))
+            {
+                ++advancedBlendRenderTargetCount;
+            }
+        }
+
+        if (advancedBlendRenderTargetCount > 1)
+        {
+            return kAdvancedBlendEquationWithMRT;
+        }
+    }
+
+    if (context->getStateCache().hasAnyEnabledClientAttrib())
+    {
+        if (extensions.webglCompatibilityANGLE || !state.areClientArraysEnabled())
+        {
+            // [WebGL 1.0] Section 6.5 Enabled Vertex Attributes and Range Checking
+            // If a vertex attribute is enabled as an array via enableVertexAttribArray but no
+            // buffer is bound to that attribute via bindBuffer and vertexAttribPointer, then calls
+            // to drawArrays or drawElements will generate an INVALID_OPERATION error.
+            return kVertexArrayNoBuffer;
+        }
+
+        if (state.getVertexArray()->hasEnabledNullPointerClientArray())
+        {
+            // This is an application error that would normally result in a crash, but we catch it
+            // and return an error
+            return kVertexArrayNoBufferPointer;
+        }
+    }
+
+    // If we are running GLES1, there is no current program.
+    if (context->getClientVersion() >= Version(2, 0))
+    {
+        Program *program                    = state.getLinkedProgram(context);
+        ProgramPipeline *programPipeline    = state.getLinkedProgramPipeline(context);
+        const ProgramExecutable *executable = state.getProgramExecutable();
+
+        bool programIsYUVOutput = false;
+
+        if (program)
+        {
+            const char *errorMsg = ValidateProgramDrawStates(context, extensions, program);
+            if (errorMsg)
+            {
+                return errorMsg;
+            }
+
+            programIsYUVOutput = executable->isYUVOutput();
+        }
+        else if (programPipeline)
+        {
+            const char *errorMsg = ValidateProgramPipelineAttachedPrograms(programPipeline);
+            if (errorMsg)
+            {
+                return errorMsg;
+            }
+
+            errorMsg = ValidateProgramPipelineDrawStates(context, extensions, programPipeline);
+            if (errorMsg)
+            {
+                return errorMsg;
+            }
+
+            if (!programPipeline->isLinked())
+            {
+                return kProgramPipelineLinkFailed;
+            }
+
+            programIsYUVOutput = executable->isYUVOutput();
+        }
+
+        if (executable)
+        {
+            if (!executable->validateSamplers(nullptr, context->getCaps()))
+            {
+                return kTextureTypeConflict;
+            }
+
+            if (executable->hasLinkedTessellationShader())
+            {
+                if (!executable->hasLinkedShaderStage(ShaderType::Vertex))
+                {
+                    return kTessellationShaderRequiresVertexShader;
+                }
+
+                if (!executable->hasLinkedShaderStage(ShaderType::TessControl) ||
+                    !executable->hasLinkedShaderStage(ShaderType::TessEvaluation))
+                {
+                    return kTessellationShaderRequiresBothControlAndEvaluation;
+                }
+            }
+
+            if (state.isTransformFeedbackActive())
+            {
+                if (!ValidateProgramExecutableXFBBuffersPresent(context, executable))
+                {
+                    return kTransformFeedbackBufferMissing;
+                }
+            }
+        }
+
+        if (programIsYUVOutput != framebufferIsYUV)
+        {
+            // Both the program and framebuffer must match in YUV output state.
+            return kYUVOutputMissmatch;
+        }
+
+        if (!state.validateSamplerFormats())
+        {
+            return kSamplerFormatMismatch;
+        }
+
+        // Do some additional WebGL-specific validation
+        if (extensions.webglCompatibilityANGLE)
+        {
+            const TransformFeedback *transformFeedbackObject = state.getCurrentTransformFeedback();
+            if (state.isTransformFeedbackActive() &&
+                transformFeedbackObject->buffersBoundForOtherUseInWebGL())
+            {
+                return kTransformFeedbackBufferDoubleBound;
+            }
+
+            // Detect rendering feedback loops for WebGL.
+            if (framebuffer->formsRenderingFeedbackLoopWith(context))
+            {
+                return kFeedbackLoop;
+            }
+
+            // Detect that the vertex shader input types match the attribute types
+            if (!ValidateVertexShaderAttributeTypeMatch(context))
+            {
+                return kVertexShaderTypeMismatch;
+            }
+
+            if (!context->getState().getRasterizerState().rasterizerDiscard &&
+                !context->getState().allActiveDrawBufferChannelsMasked())
+            {
+                // Detect that if there's active color buffer without fragment shader output
+                if (!ValidateFragmentShaderColorBufferMaskMatch(context))
+                {
+                    return kDrawBufferMaskMismatch;
+                }
+
+                // Detect that the color buffer types match the fragment shader output types
+                if (!ValidateFragmentShaderColorBufferTypeMatch(context))
+                {
+                    return kDrawBufferTypeMismatch;
+                }
+            }
+
+            const VertexArray *vao = context->getState().getVertexArray();
+            if (vao->hasTransformFeedbackBindingConflict(context))
+            {
+                return kVertexBufferBoundForTransformFeedback;
+            }
+
+            // Validate that we are rendering with a linked program.
+            if (!program->isLinked())
+            {
+                return kProgramNotLinked;
+            }
+        }
+    }
+
+    return nullptr;
+}
+
+const char *ValidateProgramPipeline(const Context *context)
+{
+    const State &state = context->getState();
+    // If we are running GLES1, there is no current program.
+    if (context->getClientVersion() >= Version(2, 0))
+    {
+        ProgramPipeline *programPipeline = state.getProgramPipeline();
+        if (programPipeline)
+        {
+            const char *errorMsg = ValidateProgramPipelineAttachedPrograms(programPipeline);
+            if (errorMsg)
+            {
+                return errorMsg;
+            }
+        }
+    }
+    return nullptr;
+}
+
+void RecordDrawModeError(const Context *context, angle::EntryPoint entryPoint, PrimitiveMode mode)
+{
+    const State &state                      = context->getState();
+    TransformFeedback *curTransformFeedback = state.getCurrentTransformFeedback();
+    if (state.isTransformFeedbackActiveUnpaused())
+    {
+        if (!ValidateTransformFeedbackPrimitiveMode(context, entryPoint,
+                                                    curTransformFeedback->getPrimitiveMode(), mode))
+        {
+            context->validationError(entryPoint, GL_INVALID_OPERATION,
+                                     kInvalidDrawModeTransformFeedback);
+            return;
+        }
+    }
+
+    const Extensions &extensions = context->getExtensions();
+
+    switch (mode)
+    {
+        case PrimitiveMode::Points:
+        case PrimitiveMode::Lines:
+        case PrimitiveMode::LineLoop:
+        case PrimitiveMode::LineStrip:
+        case PrimitiveMode::Triangles:
+        case PrimitiveMode::TriangleStrip:
+        case PrimitiveMode::TriangleFan:
+            break;
+
+        case PrimitiveMode::LinesAdjacency:
+        case PrimitiveMode::LineStripAdjacency:
+        case PrimitiveMode::TrianglesAdjacency:
+        case PrimitiveMode::TriangleStripAdjacency:
+            if (!extensions.geometryShaderAny() && context->getClientVersion() < ES_3_2)
+            {
+                context->validationError(entryPoint, GL_INVALID_ENUM,
+                                         kGeometryShaderExtensionNotEnabled);
+                return;
+            }
+            break;
+
+        case PrimitiveMode::Patches:
+            if (!extensions.tessellationShaderEXT && context->getClientVersion() < ES_3_2)
+            {
+                context->validationError(entryPoint, GL_INVALID_ENUM,
+                                         kTessellationShaderExtensionNotEnabled);
+                return;
+            }
+            break;
+
+        default:
+            context->validationError(entryPoint, GL_INVALID_ENUM, kInvalidDrawMode);
+            return;
+    }
+
+    // If we are running GLES1, there is no current program.
+    if (context->getClientVersion() >= Version(2, 0))
+    {
+        const ProgramExecutable *executable = state.getProgramExecutable();
+        ASSERT(executable);
+
+        // Do geometry shader specific validations
+        if (executable->hasLinkedShaderStage(ShaderType::Geometry))
+        {
+            if (!IsCompatibleDrawModeWithGeometryShader(
+                    mode, executable->getGeometryShaderInputPrimitiveType()))
+            {
+                context->validationError(entryPoint, GL_INVALID_OPERATION,
+                                         kIncompatibleDrawModeAgainstGeometryShader);
+                return;
+            }
+        }
+
+        if (executable->hasLinkedTessellationShader() && mode != PrimitiveMode::Patches)
+        {
+            context->validationError(entryPoint, GL_INVALID_OPERATION,
+                                     kIncompatibleDrawModeWithTessellationShader);
+            return;
+        }
+
+        if (!executable->hasLinkedTessellationShader() && mode == PrimitiveMode::Patches)
+        {
+            context->validationError(entryPoint, GL_INVALID_OPERATION,
+                                     kIncompatibleDrawModeWithoutTessellationShader);
+            return;
+        }
+    }
+
+    // An error should be recorded.
+    UNREACHABLE();
+}
+
+bool ValidateDrawArraysInstancedANGLE(const Context *context,
+                                      angle::EntryPoint entryPoint,
+                                      PrimitiveMode mode,
+                                      GLint first,
+                                      GLsizei count,
+                                      GLsizei primcount)
+{
+    if (!context->getExtensions().instancedArraysANGLE)
+    {
+        context->validationError(entryPoint, GL_INVALID_OPERATION, kExtensionNotEnabled);
+        return false;
+    }
+
+    if (!ValidateDrawArraysInstancedBase(context, entryPoint, mode, first, count, primcount))
+    {
+        return false;
+    }
+
+    return ValidateDrawInstancedANGLE(context, entryPoint);
+}
+
+bool ValidateDrawArraysInstancedEXT(const Context *context,
+                                    angle::EntryPoint entryPoint,
+                                    PrimitiveMode mode,
+                                    GLint first,
+                                    GLsizei count,
+                                    GLsizei primcount)
+{
+    if (!context->getExtensions().instancedArraysEXT)
+    {
+        context->validationError(entryPoint, GL_INVALID_OPERATION, kExtensionNotEnabled);
+        return false;
+    }
+
+    if (!ValidateDrawArraysInstancedBase(context, entryPoint, mode, first, count, primcount))
+    {
+        return false;
+    }
+
+    return true;
+}
+
+const char *ValidateDrawElementsStates(const Context *context)
+{
+    const State &state = context->getState();
+
+    if (context->getStateCache().isTransformFeedbackActiveUnpaused())
+    {
+        // EXT_geometry_shader allows transform feedback to work with all draw commands.
+        // [EXT_geometry_shader] Section 12.1, "Transform Feedback"
+        if (!context->getExtensions().geometryShaderAny() && context->getClientVersion() < ES_3_2)
+        {
+            // It is an invalid operation to call DrawElements, DrawRangeElements or
+            // DrawElementsInstanced while transform feedback is active, (3.0.2, section 2.14, pg
+            // 86)
+            return kUnsupportedDrawModeForTransformFeedback;
+        }
+    }
+
+    const VertexArray *vao     = state.getVertexArray();
+    Buffer *elementArrayBuffer = vao->getElementArrayBuffer();
+
+    if (elementArrayBuffer)
+    {
+        if (elementArrayBuffer->hasWebGLXFBBindingConflict(context->isWebGL()))
+        {
+            return kElementArrayBufferBoundForTransformFeedback;
+        }
+        if (elementArrayBuffer->isMapped() &&
+            (!elementArrayBuffer->isImmutable() ||
+             (elementArrayBuffer->getAccessFlags() & GL_MAP_PERSISTENT_BIT_EXT) == 0))
+        {
+            return kBufferMapped;
+        }
+    }
+    else
+    {
+        // [WebGL 1.0] Section 6.2 No Client Side Arrays
+        // If an indexed draw command (drawElements) is called and no WebGLBuffer is bound to
+        // the ELEMENT_ARRAY_BUFFER binding point, an INVALID_OPERATION error is generated.
+        if (!context->getState().areClientArraysEnabled() || context->isWebGL())
+        {
+            return kMustHaveElementArrayBinding;
+        }
+    }
+
+    return nullptr;
+}
+
+bool ValidateDrawElementsInstancedANGLE(const Context *context,
+                                        angle::EntryPoint entryPoint,
+                                        PrimitiveMode mode,
+                                        GLsizei count,
+                                        DrawElementsType type,
+                                        const void *indices,
+                                        GLsizei primcount)
+{
+    if (!context->getExtensions().instancedArraysANGLE)
+    {
+        context->validationError(entryPoint, GL_INVALID_OPERATION, kExtensionNotEnabled);
+        return false;
+    }
+
+    if (!ValidateDrawElementsInstancedBase(context, entryPoint, mode, count, type, indices,
+                                           primcount))
+    {
+        return false;
+    }
+
+    return ValidateDrawInstancedANGLE(context, entryPoint);
+}
+
+bool ValidateDrawElementsInstancedEXT(const Context *context,
+                                      angle::EntryPoint entryPoint,
+                                      PrimitiveMode mode,
+                                      GLsizei count,
+                                      DrawElementsType type,
+                                      const void *indices,
+                                      GLsizei primcount)
+{
+    if (!context->getExtensions().instancedArraysEXT)
+    {
+        context->validationError(entryPoint, GL_INVALID_OPERATION, kExtensionNotEnabled);
+        return false;
+    }
+
+    if (!ValidateDrawElementsInstancedBase(context, entryPoint, mode, count, type, indices,
+                                           primcount))
+    {
+        return false;
+    }
+
+    return true;
+}
+
+bool ValidateGetUniformBase(const Context *context,
+                            angle::EntryPoint entryPoint,
+                            ShaderProgramID program,
+                            UniformLocation location)
+{
+    if (program.value == 0)
+    {
+        context->validationError(entryPoint, GL_INVALID_VALUE, kProgramDoesNotExist);
+        return false;
+    }
+
+    Program *programObject = GetValidProgram(context, entryPoint, program);
+    if (!programObject)
+    {
+        return false;
+    }
+
+    if (!programObject || !programObject->isLinked())
+    {
+        context->validationError(entryPoint, GL_INVALID_OPERATION, kProgramNotLinked);
+        return false;
+    }
+
+    if (!programObject->isValidUniformLocation(location))
+    {
+        context->validationError(entryPoint, GL_INVALID_OPERATION, kInvalidUniformLocation);
+        return false;
+    }
+
+    return true;
+}
+
+bool ValidateSizedGetUniform(const Context *context,
+                             angle::EntryPoint entryPoint,
+                             ShaderProgramID program,
+                             UniformLocation location,
+                             GLsizei bufSize,
+                             GLsizei *length)
+{
+    if (length)
+    {
+        *length = 0;
+    }
+
+    if (!ValidateGetUniformBase(context, entryPoint, program, location))
+    {
+        return false;
+    }
+
+    if (bufSize < 0)
+    {
+        context->validationError(entryPoint, GL_INVALID_OPERATION, kNegativeBufferSize);
+        return false;
+    }
+
+    Program *programObject = context->getProgramResolveLink(program);
+    ASSERT(programObject);
+
+    // sized queries -- ensure the provided buffer is large enough
+    const LinkedUniform &uniform = programObject->getUniformByLocation(location);
+    size_t requiredBytes         = VariableExternalSize(uniform.type);
+    if (static_cast<size_t>(bufSize) < requiredBytes)
+    {
+        context->validationError(entryPoint, GL_INVALID_OPERATION, kInsufficientBufferSize);
+        return false;
+    }
+
+    if (length)
+    {
+        *length = VariableComponentCount(uniform.type);
+    }
+    return true;
+}
+
+bool ValidateGetnUniformfvEXT(const Context *context,
+                              angle::EntryPoint entryPoint,
+                              ShaderProgramID program,
+                              UniformLocation location,
+                              GLsizei bufSize,
+                              const GLfloat *params)
+{
+    return ValidateSizedGetUniform(context, entryPoint, program, location, bufSize, nullptr);
+}
+
+bool ValidateGetnUniformfvRobustANGLE(const Context *context,
+                                      angle::EntryPoint entryPoint,
+                                      ShaderProgramID program,
+                                      UniformLocation location,
+                                      GLsizei bufSize,
+                                      const GLsizei *length,
+                                      const GLfloat *params)
+{
+    UNIMPLEMENTED();
+    return false;
+}
+
+bool ValidateGetnUniformivEXT(const Context *context,
+                              angle::EntryPoint entryPoint,
+                              ShaderProgramID program,
+                              UniformLocation location,
+                              GLsizei bufSize,
+                              const GLint *params)
+{
+    return ValidateSizedGetUniform(context, entryPoint, program, location, bufSize, nullptr);
+}
+
+bool ValidateGetnUniformivRobustANGLE(const Context *context,
+                                      angle::EntryPoint entryPoint,
+                                      ShaderProgramID program,
+                                      UniformLocation location,
+                                      GLsizei bufSize,
+                                      const GLsizei *length,
+                                      const GLint *params)
+{
+    UNIMPLEMENTED();
+    return false;
+}
+
+bool ValidateGetnUniformuivRobustANGLE(const Context *context,
+                                       angle::EntryPoint entryPoint,
+                                       ShaderProgramID program,
+                                       UniformLocation location,
+                                       GLsizei bufSize,
+                                       const GLsizei *length,
+                                       const GLuint *params)
+{
+    UNIMPLEMENTED();
+    return false;
+}
+
+bool ValidateGetUniformfvRobustANGLE(const Context *context,
+                                     angle::EntryPoint entryPoint,
+                                     ShaderProgramID program,
+                                     UniformLocation location,
+                                     GLsizei bufSize,
+                                     const GLsizei *length,
+                                     const GLfloat *params)
+{
+    if (!ValidateRobustEntryPoint(context, entryPoint, bufSize))
+    {
+        return false;
+    }
+
+    GLsizei writeLength = 0;
+
+    // bufSize is validated in ValidateSizedGetUniform
+    if (!ValidateSizedGetUniform(context, entryPoint, program, location, bufSize, &writeLength))
+    {
+        return false;
+    }
+
+    SetRobustLengthParam(length, writeLength);
+
+    return true;
+}
+
+bool ValidateGetUniformivRobustANGLE(const Context *context,
+                                     angle::EntryPoint entryPoint,
+                                     ShaderProgramID program,
+                                     UniformLocation location,
+                                     GLsizei bufSize,
+                                     const GLsizei *length,
+                                     const GLint *params)
+{
+    if (!ValidateRobustEntryPoint(context, entryPoint, bufSize))
+    {
+        return false;
+    }
+
+    GLsizei writeLength = 0;
+
+    // bufSize is validated in ValidateSizedGetUniform
+    if (!ValidateSizedGetUniform(context, entryPoint, program, location, bufSize, &writeLength))
+    {
+        return false;
+    }
+
+    SetRobustLengthParam(length, writeLength);
+
+    return true;
+}
+
+bool ValidateGetUniformuivRobustANGLE(const Context *context,
+                                      angle::EntryPoint entryPoint,
+                                      ShaderProgramID program,
+                                      UniformLocation location,
+                                      GLsizei bufSize,
+                                      const GLsizei *length,
+                                      const GLuint *params)
+{
+    if (!ValidateRobustEntryPoint(context, entryPoint, bufSize))
+    {
+        return false;
+    }
+
+    if (context->getClientMajorVersion() < 3)
+    {
+        context->validationError(entryPoint, GL_INVALID_OPERATION, kES3Required);
+        return false;
+    }
+
+    GLsizei writeLength = 0;
+
+    // bufSize is validated in ValidateSizedGetUniform
+    if (!ValidateSizedGetUniform(context, entryPoint, program, location, bufSize, &writeLength))
+    {
+        return false;
+    }
+
+    SetRobustLengthParam(length, writeLength);
+
+    return true;
+}
+
+bool ValidateDiscardFramebufferBase(const Context *context,
+                                    angle::EntryPoint entryPoint,
+                                    GLenum target,
+                                    GLsizei numAttachments,
+                                    const GLenum *attachments,
+                                    bool defaultFramebuffer)
+{
+    if (numAttachments < 0)
+    {
+        context->validationError(entryPoint, GL_INVALID_VALUE, kNegativeAttachments);
+        return false;
+    }
+
+    for (GLsizei i = 0; i < numAttachments; ++i)
+    {
+        if (attachments[i] >= GL_COLOR_ATTACHMENT0 && attachments[i] <= GL_COLOR_ATTACHMENT31)
+        {
+            if (defaultFramebuffer)
+            {
+                context->validationError(entryPoint, GL_INVALID_ENUM,
+                                         kDefaultFramebufferInvalidAttachment);
+                return false;
+            }
+
+            if (attachments[i] >=
+                GL_COLOR_ATTACHMENT0 + static_cast<GLuint>(context->getCaps().maxColorAttachments))
+            {
+                context->validationError(entryPoint, GL_INVALID_OPERATION,
+                                         kExceedsMaxColorAttachments);
+                return false;
+            }
+        }
+        else
+        {
+            switch (attachments[i])
+            {
+                case GL_DEPTH_ATTACHMENT:
+                case GL_STENCIL_ATTACHMENT:
+                case GL_DEPTH_STENCIL_ATTACHMENT:
+                    if (defaultFramebuffer)
+                    {
+                        context->validationError(entryPoint, GL_INVALID_ENUM,
+                                                 kDefaultFramebufferInvalidAttachment);
+                        return false;
+                    }
+                    break;
+                case GL_COLOR:
+                case GL_DEPTH:
+                case GL_STENCIL:
+                    if (!defaultFramebuffer)
+                    {
+                        context->validationError(entryPoint, GL_INVALID_ENUM,
+                                                 kDefaultFramebufferAttachmentOnUserFBO);
+                        return false;
+                    }
+                    break;
+                default:
+                    context->validationError(entryPoint, GL_INVALID_ENUM, kInvalidAttachment);
+                    return false;
+            }
+        }
+    }
+
+    return true;
+}
+
+bool ValidateInsertEventMarkerEXT(const Context *context,
+                                  angle::EntryPoint entryPoint,
+                                  GLsizei length,
+                                  const char *marker)
+{
+    if (!context->getExtensions().debugMarkerEXT)
+    {
+        // The debug marker calls should not set error state
+        // However, it seems reasonable to set an error state if the extension is not enabled
+        context->validationError(entryPoint, GL_INVALID_OPERATION, kExtensionNotEnabled);
+        return false;
+    }
+
+    // Note that debug marker calls must not set error state
+    if (length < 0)
+    {
+        return false;
+    }
+
+    if (marker == nullptr)
+    {
+        return false;
+    }
+
+    return true;
+}
+
+bool ValidatePushGroupMarkerEXT(const Context *context,
+                                angle::EntryPoint entryPoint,
+                                GLsizei length,
+                                const char *marker)
+{
+    if (!context->getExtensions().debugMarkerEXT)
+    {
+        // The debug marker calls should not set error state
+        // However, it seems reasonable to set an error state if the extension is not enabled
+        context->validationError(entryPoint, GL_INVALID_OPERATION, kExtensionNotEnabled);
+        return false;
+    }
+
+    // Note that debug marker calls must not set error state
+    if (length < 0)
+    {
+        return false;
+    }
+
+    if (length > 0 && marker == nullptr)
+    {
+        return false;
+    }
+
+    return true;
+}
+
+bool ValidateEGLImageObject(const Context *context,
+                            angle::EntryPoint entryPoint,
+                            TextureType type,
+                            GLeglImageOES image)
+{
+    egl::Image *imageObject = static_cast<egl::Image *>(image);
+
+    ASSERT(context->getDisplay());
+    if (!context->getDisplay()->isValidImage(imageObject))
+    {
+        context->validationError(entryPoint, GL_INVALID_VALUE, kInvalidEGLImage);
+        return false;
+    }
+
+    if (imageObject->getSamples() > 0)
+    {
+        context->validationError(entryPoint, GL_INVALID_OPERATION,
+                                 kEGLImageCannotCreate2DMultisampled);
+        return false;
+    }
+
+    if (!imageObject->isTexturable(context))
+    {
+        context->validationError(entryPoint, GL_INVALID_OPERATION,
+                                 kEGLImageTextureFormatNotSupported);
+        return false;
+    }
+
+    // Validate source egl image and target texture are compatible
+    size_t depth = static_cast<size_t>(imageObject->getExtents().depth);
+    if (imageObject->isYUV() && type != TextureType::External)
+    {
+        context->validationError(entryPoint, GL_INVALID_OPERATION,
+                                 "Image is YUV, target must be TEXTURE_EXTERNAL_OES");
+        return false;
+    }
+
+    if (depth > 1 && type != TextureType::_2DArray && type != TextureType::CubeMap &&
+        type != TextureType::CubeMapArray && type != TextureType::_3D)
+    {
+        context->validationError(entryPoint, GL_INVALID_OPERATION, kEGLImageTextureTargetMismatch);
+        return false;
+    }
+
+    if (imageObject->isCubeMap() && type != TextureType::CubeMapArray &&
+        (type != TextureType::CubeMap || depth > gl::kCubeFaceCount))
+    {
+        context->validationError(entryPoint, GL_INVALID_OPERATION, kEGLImageTextureTargetMismatch);
+        return false;
+    }
+
+    if (imageObject->getLevelCount() > 1 && type == TextureType::External)
+    {
+        context->validationError(entryPoint, GL_INVALID_OPERATION, kEGLImageTextureTargetMismatch);
+        return false;
+    }
+
+    // 3d EGLImages are currently not supported
+    if (type == TextureType::_3D)
+    {
+        context->validationError(entryPoint, GL_INVALID_OPERATION, kEGLImageTextureTargetMismatch);
+        return false;
+    }
+
+    if (imageObject->hasProtectedContent() && !context->getState().hasProtectedContent())
+    {
+        context->validationError(entryPoint, GL_INVALID_OPERATION,
+                                 "Mismatch between Image and Context Protected Content state");
+        return false;
+    }
+
+    return true;
+}
+
+bool ValidateEGLImageTargetTexture2DOES(const Context *context,
+                                        angle::EntryPoint entryPoint,
+                                        TextureType type,
+                                        GLeglImageOES image)
+{
+    if (!context->getExtensions().EGLImageOES && !context->getExtensions().EGLImageExternalOES)
+    {
+        context->validationError(entryPoint, GL_INVALID_OPERATION, kExtensionNotEnabled);
+        return false;
+    }
+
+    switch (type)
+    {
+        case TextureType::_2D:
+            if (!context->getExtensions().EGLImageOES)
+            {
+                context->validationErrorF(entryPoint, GL_INVALID_ENUM, kEnumNotSupported,
+                                          ToGLenum(type));
+            }
+            break;
+
+        case TextureType::_2DArray:
+            if (!context->getExtensions().EGLImageArrayEXT)
+            {
+                context->validationErrorF(entryPoint, GL_INVALID_ENUM, kEnumNotSupported,
+                                          ToGLenum(type));
+            }
+            break;
+
+        case TextureType::External:
+            if (!context->getExtensions().EGLImageExternalOES)
+            {
+                context->validationErrorF(entryPoint, GL_INVALID_ENUM, kEnumNotSupported,
+                                          ToGLenum(type));
+            }
+            break;
+
+        default:
+            context->validationError(entryPoint, GL_INVALID_ENUM, kInvalidTextureTarget);
+            return false;
+    }
+
+    return ValidateEGLImageObject(context, entryPoint, type, image);
+}
+
+bool ValidateEGLImageTargetRenderbufferStorageOES(const Context *context,
+                                                  angle::EntryPoint entryPoint,
+                                                  GLenum target,
+                                                  GLeglImageOES image)
+{
+    if (!context->getExtensions().EGLImageOES)
+    {
+        context->validationError(entryPoint, GL_INVALID_OPERATION, kExtensionNotEnabled);
+        return false;
+    }
+
+    switch (target)
+    {
+        case GL_RENDERBUFFER:
+            break;
+
+        default:
+            context->validationError(entryPoint, GL_INVALID_ENUM, kInvalidRenderbufferTarget);
+            return false;
+    }
+
+    egl::Image *imageObject = static_cast<egl::Image *>(image);
+
+    ASSERT(context->getDisplay());
+    if (!context->getDisplay()->isValidImage(imageObject))
+    {
+        context->validationError(entryPoint, GL_INVALID_VALUE, kInvalidEGLImage);
+        return false;
+    }
+
+    if (!imageObject->isRenderable(context))
+    {
+        context->validationError(entryPoint, GL_INVALID_OPERATION,
+                                 kEGLImageRenderbufferFormatNotSupported);
+        return false;
+    }
+
+    if (imageObject->hasProtectedContent() != context->getState().hasProtectedContent())
+    {
+        context->validationError(entryPoint, GL_INVALID_OPERATION,
+                                 "Mismatch between Image and Context Protected Content state");
+        return false;
+    }
+
+    return true;
+}
+
+bool ValidateProgramBinaryBase(const Context *context,
+                               angle::EntryPoint entryPoint,
+                               ShaderProgramID program,
+                               GLenum binaryFormat,
+                               const void *binary,
+                               GLint length)
+{
+    Program *programObject = GetValidProgram(context, entryPoint, program);
+    if (programObject == nullptr)
+    {
+        return false;
+    }
+
+    const std::vector<GLenum> &programBinaryFormats = context->getCaps().programBinaryFormats;
+    if (std::find(programBinaryFormats.begin(), programBinaryFormats.end(), binaryFormat) ==
+        programBinaryFormats.end())
+    {
+        context->validationError(entryPoint, GL_INVALID_ENUM, kInvalidProgramBinaryFormat);
+        return false;
+    }
+
+    if (context->hasActiveTransformFeedback(program))
+    {
+        // ES 3.0.4 section 2.15 page 91
+        context->validationError(entryPoint, GL_INVALID_OPERATION, kTransformFeedbackProgramBinary);
+        return false;
+    }
+
+    return true;
+}
+
+bool ValidateGetProgramBinaryBase(const Context *context,
+                                  angle::EntryPoint entryPoint,
+                                  ShaderProgramID program,
+                                  GLsizei bufSize,
+                                  const GLsizei *length,
+                                  const GLenum *binaryFormat,
+                                  const void *binary)
+{
+    Program *programObject = GetValidProgram(context, entryPoint, program);
+    if (programObject == nullptr)
+    {
+        return false;
+    }
+
+    if (!programObject->isLinked())
+    {
+        context->validationError(entryPoint, GL_INVALID_OPERATION, kProgramNotLinked);
+        return false;
+    }
+
+    if (context->getCaps().programBinaryFormats.empty())
+    {
+        context->validationError(entryPoint, GL_INVALID_OPERATION, kNoProgramBinaryFormats);
+        return false;
+    }
+
+    return true;
+}
+
+bool ValidateDrawBuffersBase(const Context *context,
+                             angle::EntryPoint entryPoint,
+                             GLsizei n,
+                             const GLenum *bufs)
+{
+    // INVALID_VALUE is generated if n is negative or greater than value of MAX_DRAW_BUFFERS
+    if (n < 0)
+    {
+        context->validationError(entryPoint, GL_INVALID_VALUE, kNegativeCount);
+        return false;
+    }
+    if (n > context->getCaps().maxDrawBuffers)
+    {
+        context->validationError(entryPoint, GL_INVALID_VALUE, kIndexExceedsMaxDrawBuffer);
+        return false;
+    }
+
+    ASSERT(context->getState().getDrawFramebuffer());
+    FramebufferID frameBufferId = context->getState().getDrawFramebuffer()->id();
+    GLuint maxColorAttachment   = GL_COLOR_ATTACHMENT0_EXT + context->getCaps().maxColorAttachments;
+
+    // This should come first before the check for the default frame buffer
+    // because when we switch to ES3.1+, invalid enums will return INVALID_ENUM
+    // rather than INVALID_OPERATION
+    for (int colorAttachment = 0; colorAttachment < n; colorAttachment++)
+    {
+        const GLenum attachment = GL_COLOR_ATTACHMENT0_EXT + colorAttachment;
+
+        if (bufs[colorAttachment] != GL_NONE && bufs[colorAttachment] != GL_BACK &&
+            (bufs[colorAttachment] < GL_COLOR_ATTACHMENT0 ||
+             bufs[colorAttachment] > GL_COLOR_ATTACHMENT31))
+        {
+            // Value in bufs is not NONE, BACK, or GL_COLOR_ATTACHMENTi
+            // The 3.0.4 spec says to generate GL_INVALID_OPERATION here, but this
+            // was changed to GL_INVALID_ENUM in 3.1, which dEQP also expects.
+            // 3.1 is still a bit ambiguous about the error, but future specs are
+            // expected to clarify that GL_INVALID_ENUM is the correct error.
+            context->validationError(entryPoint, GL_INVALID_ENUM, kInvalidDrawBuffer);
+            return false;
+        }
+        else if (bufs[colorAttachment] >= maxColorAttachment)
+        {
+            context->validationError(entryPoint, GL_INVALID_OPERATION, kExceedsMaxColorAttachments);
+            return false;
+        }
+        else if (bufs[colorAttachment] != GL_NONE && bufs[colorAttachment] != attachment &&
+                 frameBufferId.value != 0)
+        {
+            // INVALID_OPERATION-GL is bound to buffer and ith argument
+            // is not COLOR_ATTACHMENTi or NONE
+            context->validationError(entryPoint, GL_INVALID_OPERATION, kInvalidDrawBufferValue);
+            return false;
+        }
+    }
+
+    // INVALID_OPERATION is generated if GL is bound to the default framebuffer
+    // and n is not 1 or bufs is bound to value other than BACK and NONE
+    if (frameBufferId.value == 0)
+    {
+        if (n != 1)
+        {
+            context->validationError(entryPoint, GL_INVALID_OPERATION,
+                                     kInvalidDrawBufferCountForDefault);
+            return false;
+        }
+
+        if (bufs[0] != GL_NONE && bufs[0] != GL_BACK)
+        {
+            context->validationError(entryPoint, GL_INVALID_OPERATION,
+                                     kDefaultFramebufferInvalidDrawBuffer);
+            return false;
+        }
+    }
+
+    return true;
+}
+
+bool ValidateGetBufferPointervBase(const Context *context,
+                                   angle::EntryPoint entryPoint,
+                                   BufferBinding target,
+                                   GLenum pname,
+                                   GLsizei *length,
+                                   void *const *params)
+{
+    if (length)
+    {
+        *length = 0;
+    }
+
+    if (!context->isValidBufferBinding(target))
+    {
+        context->validationError(entryPoint, GL_INVALID_ENUM, kInvalidBufferTypes);
+        return false;
+    }
+
+    switch (pname)
+    {
+        case GL_BUFFER_MAP_POINTER:
+            break;
+
+        default:
+            context->validationErrorF(entryPoint, GL_INVALID_ENUM, kEnumNotSupported, pname);
+            return false;
+    }
+
+    // GLES 3.0 section 2.10.1: "Attempts to attempts to modify or query buffer object state for a
+    // target bound to zero generate an INVALID_OPERATION error."
+    // GLES 3.1 section 6.6 explicitly specifies this error.
+    if (context->getState().getTargetBuffer(target) == nullptr)
+    {
+        context->validationError(entryPoint, GL_INVALID_OPERATION, kBufferPointerNotAvailable);
+        return false;
+    }
+
+    if (length)
+    {
+        *length = 1;
+    }
+
+    return true;
+}
+
+bool ValidateUnmapBufferBase(const Context *context,
+                             angle::EntryPoint entryPoint,
+                             BufferBinding target)
+{
+    if (!context->isValidBufferBinding(target))
+    {
+        context->validationError(entryPoint, GL_INVALID_ENUM, kInvalidBufferTypes);
+        return false;
+    }
+
+    Buffer *buffer = context->getState().getTargetBuffer(target);
+
+    if (buffer == nullptr || !buffer->isMapped())
+    {
+        context->validationError(entryPoint, GL_INVALID_OPERATION, kBufferNotMapped);
+        return false;
+    }
+
+    return true;
+}
+
+bool ValidateMapBufferRangeBase(const Context *context,
+                                angle::EntryPoint entryPoint,
+                                BufferBinding target,
+                                GLintptr offset,
+                                GLsizeiptr length,
+                                GLbitfield access)
+{
+    if (!context->isValidBufferBinding(target))
+    {
+        context->validationError(entryPoint, GL_INVALID_ENUM, kInvalidBufferTypes);
+        return false;
+    }
+
+    if (offset < 0)
+    {
+        context->validationError(entryPoint, GL_INVALID_VALUE, kNegativeOffset);
+        return false;
+    }
+
+    if (length < 0)
+    {
+        context->validationError(entryPoint, GL_INVALID_VALUE, kNegativeLength);
+        return false;
+    }
+
+    Buffer *buffer = context->getState().getTargetBuffer(target);
+
+    if (!buffer)
+    {
+        context->validationError(entryPoint, GL_INVALID_OPERATION, kBufferNotMappable);
+        return false;
+    }
+
+    // Check for buffer overflow
+    CheckedNumeric<size_t> checkedOffset(offset);
+    auto checkedSize = checkedOffset + length;
+
+    if (!checkedSize.IsValid() || checkedSize.ValueOrDie() > static_cast<size_t>(buffer->getSize()))
+    {
+        context->validationError(entryPoint, GL_INVALID_VALUE, kMapOutOfRange);
+        return false;
+    }
+
+    // Check for invalid bits in the mask
+    constexpr GLbitfield kAllAccessBits =
+        GL_MAP_READ_BIT | GL_MAP_WRITE_BIT | GL_MAP_INVALIDATE_RANGE_BIT |
+        GL_MAP_INVALIDATE_BUFFER_BIT | GL_MAP_FLUSH_EXPLICIT_BIT | GL_MAP_UNSYNCHRONIZED_BIT;
+
+    if (buffer->isImmutable())
+    {
+        // GL_EXT_buffer_storage's additions to glMapBufferRange
+        constexpr GLbitfield kBufferStorageAccessBits =
+            kAllAccessBits | GL_MAP_PERSISTENT_BIT_EXT | GL_MAP_COHERENT_BIT_EXT;
+
+        if ((access & ~kBufferStorageAccessBits) != 0)
+        {
+            context->validationError(entryPoint, GL_INVALID_VALUE, kInvalidAccessBits);
+            return false;
+        }
+
+        // It is invalid if any of bufferStorageMatchedAccessBits bits are included in access,
+        // but the same bits are not included in the buffer's storage flags
+        constexpr GLbitfield kBufferStorageMatchedAccessBits = GL_MAP_READ_BIT | GL_MAP_WRITE_BIT |
+                                                               GL_MAP_PERSISTENT_BIT_EXT |
+                                                               GL_MAP_COHERENT_BIT_EXT;
+        GLbitfield accessFlags = access & kBufferStorageMatchedAccessBits;
+        if ((accessFlags & buffer->getStorageExtUsageFlags()) != accessFlags)
+        {
+            context->validationError(entryPoint, GL_INVALID_OPERATION, kInvalidAccessBits);
+            return false;
+        }
+    }
+    else if ((access & ~kAllAccessBits) != 0)
+    {
+        context->validationError(entryPoint, GL_INVALID_VALUE, kInvalidAccessBits);
+        return false;
+    }
+
+    if (length == 0)
+    {
+        context->validationError(entryPoint, GL_INVALID_OPERATION, kLengthZero);
+        return false;
+    }
+
+    if (buffer->isMapped())
+    {
+        context->validationError(entryPoint, GL_INVALID_OPERATION, kBufferAlreadyMapped);
+        return false;
+    }
+
+    // Check for invalid bit combinations
+    if ((access & (GL_MAP_READ_BIT | GL_MAP_WRITE_BIT)) == 0)
+    {
+        context->validationError(entryPoint, GL_INVALID_OPERATION, kInvalidAccessBitsReadWrite);
+        return false;
+    }
+
+    GLbitfield writeOnlyBits =
+        GL_MAP_INVALIDATE_RANGE_BIT | GL_MAP_INVALIDATE_BUFFER_BIT | GL_MAP_UNSYNCHRONIZED_BIT;
+
+    if ((access & GL_MAP_READ_BIT) != 0 && (access & writeOnlyBits) != 0)
+    {
+        context->validationError(entryPoint, GL_INVALID_OPERATION, kInvalidAccessBitsRead);
+        return false;
+    }
+
+    if ((access & GL_MAP_WRITE_BIT) == 0 && (access & GL_MAP_FLUSH_EXPLICIT_BIT) != 0)
+    {
+        context->validationError(entryPoint, GL_INVALID_OPERATION, kInvalidAccessBitsFlush);
+        return false;
+    }
+
+    return ValidateMapBufferBase(context, entryPoint, target);
+}
+
+bool ValidateFlushMappedBufferRangeBase(const Context *context,
+                                        angle::EntryPoint entryPoint,
+                                        BufferBinding target,
+                                        GLintptr offset,
+                                        GLsizeiptr length)
+{
+    if (offset < 0)
+    {
+        context->validationError(entryPoint, GL_INVALID_VALUE, kNegativeOffset);
+        return false;
+    }
+
+    if (length < 0)
+    {
+        context->validationError(entryPoint, GL_INVALID_VALUE, kNegativeLength);
+        return false;
+    }
+
+    if (!context->isValidBufferBinding(target))
+    {
+        context->validationError(entryPoint, GL_INVALID_ENUM, kInvalidBufferTypes);
+        return false;
+    }
+
+    Buffer *buffer = context->getState().getTargetBuffer(target);
+
+    if (buffer == nullptr)
+    {
+        context->validationError(entryPoint, GL_INVALID_OPERATION, kInvalidFlushZero);
+        return false;
+    }
+
+    if (!buffer->isMapped() || (buffer->getAccessFlags() & GL_MAP_FLUSH_EXPLICIT_BIT) == 0)
+    {
+        context->validationError(entryPoint, GL_INVALID_OPERATION, kInvalidFlushTarget);
+        return false;
+    }
+
+    // Check for buffer overflow
+    CheckedNumeric<size_t> checkedOffset(offset);
+    auto checkedSize = checkedOffset + length;
+
+    if (!checkedSize.IsValid() ||
+        checkedSize.ValueOrDie() > static_cast<size_t>(buffer->getMapLength()))
+    {
+        context->validationError(entryPoint, GL_INVALID_VALUE, kInvalidFlushOutOfRange);
+        return false;
+    }
+
+    return true;
+}
+
+bool ValidateGenOrDelete(const Context *context, angle::EntryPoint entryPoint, GLint n)
+{
+    if (n < 0)
+    {
+        context->validationError(entryPoint, GL_INVALID_VALUE, kNegativeCount);
+        return false;
+    }
+    return true;
+}
+
+bool ValidateRobustEntryPoint(const Context *context, angle::EntryPoint entryPoint, GLsizei bufSize)
+{
+    if (!context->getExtensions().robustClientMemoryANGLE)
+    {
+        context->validationError(entryPoint, GL_INVALID_OPERATION, kExtensionNotEnabled);
+        return false;
+    }
+
+    if (bufSize < 0)
+    {
+        context->validationError(entryPoint, GL_INVALID_VALUE, kNegativeBufferSize);
+        return false;
+    }
+
+    return true;
+}
+
+bool ValidateRobustBufferSize(const Context *context,
+                              angle::EntryPoint entryPoint,
+                              GLsizei bufSize,
+                              GLsizei numParams)
+{
+    if (bufSize < numParams)
+    {
+        context->validationError(entryPoint, GL_INVALID_OPERATION, kInsufficientParams);
+        return false;
+    }
+
+    return true;
+}
+
+bool ValidateGetFramebufferAttachmentParameterivBase(const Context *context,
+                                                     angle::EntryPoint entryPoint,
+                                                     GLenum target,
+                                                     GLenum attachment,
+                                                     GLenum pname,
+                                                     GLsizei *numParams)
+{
+    if (!ValidFramebufferTarget(context, target))
+    {
+        context->validationError(entryPoint, GL_INVALID_ENUM, kInvalidFramebufferTarget);
+        return false;
+    }
+
+    int clientVersion = context->getClientMajorVersion();
+
+    switch (pname)
+    {
+        case GL_FRAMEBUFFER_ATTACHMENT_OBJECT_TYPE:
+        case GL_FRAMEBUFFER_ATTACHMENT_OBJECT_NAME:
+        case GL_FRAMEBUFFER_ATTACHMENT_TEXTURE_LEVEL:
+        case GL_FRAMEBUFFER_ATTACHMENT_TEXTURE_CUBE_MAP_FACE:
+            break;
+
+        case GL_FRAMEBUFFER_ATTACHMENT_TEXTURE_NUM_VIEWS_OVR:
+        case GL_FRAMEBUFFER_ATTACHMENT_TEXTURE_BASE_VIEW_INDEX_OVR:
+            if (clientVersion < 3 ||
+                !(context->getExtensions().multiviewOVR || context->getExtensions().multiview2OVR))
+            {
+                context->validationErrorF(entryPoint, GL_INVALID_ENUM, kEnumNotSupported, pname);
+                return false;
+            }
+            break;
+
+        case GL_FRAMEBUFFER_ATTACHMENT_TEXTURE_SAMPLES_EXT:
+            if (!context->getExtensions().multisampledRenderToTextureEXT)
+            {
+                context->validationErrorF(entryPoint, GL_INVALID_ENUM, kEnumNotSupported, pname);
+                return false;
+            }
+            break;
+
+        case GL_FRAMEBUFFER_ATTACHMENT_COLOR_ENCODING:
+            if (clientVersion < 3 && !context->getExtensions().sRGBEXT)
+            {
+                context->validationErrorF(entryPoint, GL_INVALID_ENUM, kEnumNotSupported, pname);
+                return false;
+            }
+            break;
+
+        case GL_FRAMEBUFFER_ATTACHMENT_RED_SIZE:
+        case GL_FRAMEBUFFER_ATTACHMENT_GREEN_SIZE:
+        case GL_FRAMEBUFFER_ATTACHMENT_BLUE_SIZE:
+        case GL_FRAMEBUFFER_ATTACHMENT_ALPHA_SIZE:
+        case GL_FRAMEBUFFER_ATTACHMENT_DEPTH_SIZE:
+        case GL_FRAMEBUFFER_ATTACHMENT_STENCIL_SIZE:
+        case GL_FRAMEBUFFER_ATTACHMENT_COMPONENT_TYPE:
+        case GL_FRAMEBUFFER_ATTACHMENT_TEXTURE_LAYER:
+            if (clientVersion < 3)
+            {
+                context->validationError(entryPoint, GL_INVALID_ENUM, kES3Required);
+                return false;
+            }
+            break;
+
+        case GL_FRAMEBUFFER_ATTACHMENT_LAYERED_EXT:
+            if (!context->getExtensions().geometryShaderAny() &&
+                context->getClientVersion() < ES_3_2)
+            {
+                context->validationError(entryPoint, GL_INVALID_ENUM,
+                                         kGeometryShaderExtensionNotEnabled);
+                return false;
+            }
+            break;
+
+        default:
+            context->validationError(entryPoint, GL_INVALID_ENUM, kInvalidPname);
+            return false;
+    }
+
+    // Determine if the attachment is a valid enum
+    switch (attachment)
+    {
+        case GL_BACK:
+        case GL_DEPTH:
+        case GL_STENCIL:
+            if (clientVersion < 3)
+            {
+                context->validationError(entryPoint, GL_INVALID_ENUM, kInvalidAttachment);
+                return false;
+            }
+            break;
+
+        case GL_DEPTH_STENCIL_ATTACHMENT:
+            if (clientVersion < 3 && !context->isWebGL1())
+            {
+                context->validationError(entryPoint, GL_INVALID_ENUM, kInvalidAttachment);
+                return false;
+            }
+            break;
+
+        case GL_COLOR_ATTACHMENT0:
+        case GL_DEPTH_ATTACHMENT:
+        case GL_STENCIL_ATTACHMENT:
+            break;
+
+        default:
+            if ((clientVersion < 3 && !context->getExtensions().drawBuffersEXT) ||
+                attachment < GL_COLOR_ATTACHMENT0_EXT ||
+                (attachment - GL_COLOR_ATTACHMENT0_EXT) >=
+                    static_cast<GLuint>(context->getCaps().maxColorAttachments))
+            {
+                context->validationError(entryPoint, GL_INVALID_ENUM, kInvalidAttachment);
+                return false;
+            }
+            break;
+    }
+
+    const Framebuffer *framebuffer = context->getState().getTargetFramebuffer(target);
+    ASSERT(framebuffer);
+
+    if (framebuffer->isDefault())
+    {
+        if (clientVersion < 3)
+        {
+            context->validationError(entryPoint, GL_INVALID_OPERATION, kDefaultFramebufferTarget);
+            return false;
+        }
+
+        switch (attachment)
+        {
+            case GL_BACK:
+            case GL_DEPTH:
+            case GL_STENCIL:
+                break;
+
+            default:
+                context->validationError(entryPoint, GL_INVALID_OPERATION, kInvalidAttachment);
+                return false;
+        }
+    }
+    else
+    {
+        if (attachment >= GL_COLOR_ATTACHMENT0_EXT && attachment <= GL_COLOR_ATTACHMENT15_EXT)
+        {
+            // Valid attachment query
+        }
+        else
+        {
+            switch (attachment)
+            {
+                case GL_DEPTH_ATTACHMENT:
+                case GL_STENCIL_ATTACHMENT:
+                    break;
+
+                case GL_DEPTH_STENCIL_ATTACHMENT:
+                    if (!framebuffer->hasValidDepthStencil() && !context->isWebGL1())
+                    {
+                        context->validationError(entryPoint, GL_INVALID_OPERATION,
+                                                 kInvalidAttachment);
+                        return false;
+                    }
+                    break;
+
+                default:
+                    context->validationError(entryPoint, GL_INVALID_OPERATION, kInvalidAttachment);
+                    return false;
+            }
+        }
+    }
+
+    const FramebufferAttachment *attachmentObject = framebuffer->getAttachment(context, attachment);
+    if (attachmentObject)
+    {
+        ASSERT(attachmentObject->type() == GL_RENDERBUFFER ||
+               attachmentObject->type() == GL_TEXTURE ||
+               attachmentObject->type() == GL_FRAMEBUFFER_DEFAULT);
+
+        switch (pname)
+        {
+            case GL_FRAMEBUFFER_ATTACHMENT_OBJECT_NAME:
+                if (attachmentObject->type() != GL_RENDERBUFFER &&
+                    attachmentObject->type() != GL_TEXTURE)
+                {
+                    context->validationError(entryPoint, GL_INVALID_ENUM,
+                                             kFramebufferIncompleteAttachment);
+                    return false;
+                }
+                break;
+
+            case GL_FRAMEBUFFER_ATTACHMENT_TEXTURE_LEVEL:
+                if (attachmentObject->type() != GL_TEXTURE)
+                {
+                    context->validationError(entryPoint, GL_INVALID_ENUM,
+                                             kFramebufferIncompleteAttachment);
+                    return false;
+                }
+                break;
+
+            case GL_FRAMEBUFFER_ATTACHMENT_TEXTURE_CUBE_MAP_FACE:
+                if (attachmentObject->type() != GL_TEXTURE)
+                {
+                    context->validationError(entryPoint, GL_INVALID_ENUM,
+                                             kFramebufferIncompleteAttachment);
+                    return false;
+                }
+                break;
+
+            case GL_FRAMEBUFFER_ATTACHMENT_COMPONENT_TYPE:
+                if (attachment == GL_DEPTH_STENCIL_ATTACHMENT)
+                {
+                    context->validationError(entryPoint, GL_INVALID_OPERATION, kInvalidAttachment);
+                    return false;
+                }
+                break;
+
+            case GL_FRAMEBUFFER_ATTACHMENT_TEXTURE_LAYER:
+                if (attachmentObject->type() != GL_TEXTURE)
+                {
+                    context->validationError(entryPoint, GL_INVALID_ENUM,
+                                             kFramebufferIncompleteAttachment);
+                    return false;
+                }
+                break;
+
+            default:
+                break;
+        }
+    }
+    else
+    {
+        // ES 2.0.25 spec pg 127 states that if the value of FRAMEBUFFER_ATTACHMENT_OBJECT_TYPE
+        // is NONE, then querying any other pname will generate INVALID_ENUM.
+
+        // ES 3.0.2 spec pg 235 states that if the attachment type is none,
+        // GL_FRAMEBUFFER_ATTACHMENT_OBJECT_NAME will return zero and be an
+        // INVALID_OPERATION for all other pnames
+
+        switch (pname)
+        {
+            case GL_FRAMEBUFFER_ATTACHMENT_OBJECT_TYPE:
+                break;
+
+            case GL_FRAMEBUFFER_ATTACHMENT_OBJECT_NAME:
+                if (clientVersion < 3)
+                {
+                    context->validationError(entryPoint, GL_INVALID_ENUM,
+                                             kInvalidFramebufferAttachmentParameter);
+                    return false;
+                }
+                break;
+
+            default:
+                if (clientVersion < 3)
+                {
+                    context->validationError(entryPoint, GL_INVALID_ENUM,
+                                             kInvalidFramebufferAttachmentParameter);
+                    return false;
+                }
+                else
+                {
+                    context->validationError(entryPoint, GL_INVALID_OPERATION,
+                                             kInvalidFramebufferAttachmentParameter);
+                    return false;
+                }
+        }
+    }
+
+    if (numParams)
+    {
+        *numParams = 1;
+    }
+
+    return true;
+}
+
+bool ValidateGetFramebufferParameterivBase(const Context *context,
+                                           angle::EntryPoint entryPoint,
+                                           GLenum target,
+                                           GLenum pname,
+                                           const GLint *params)
+{
+    if (!ValidFramebufferTarget(context, target))
+    {
+        context->validationError(entryPoint, GL_INVALID_ENUM, kInvalidFramebufferTarget);
+        return false;
+    }
+
+    switch (pname)
+    {
+        case GL_FRAMEBUFFER_DEFAULT_WIDTH:
+        case GL_FRAMEBUFFER_DEFAULT_HEIGHT:
+        case GL_FRAMEBUFFER_DEFAULT_SAMPLES:
+        case GL_FRAMEBUFFER_DEFAULT_FIXED_SAMPLE_LOCATIONS:
+            break;
+        case GL_FRAMEBUFFER_DEFAULT_LAYERS_EXT:
+            if (!context->getExtensions().geometryShaderAny() &&
+                context->getClientVersion() < ES_3_2)
+            {
+                context->validationError(entryPoint, GL_INVALID_ENUM,
+                                         kGeometryShaderExtensionNotEnabled);
+                return false;
+            }
+            break;
+        case GL_FRAMEBUFFER_FLIP_Y_MESA:
+            if (!context->getExtensions().framebufferFlipYMESA)
+            {
+                context->validationError(entryPoint, GL_INVALID_ENUM, kInvalidPname);
+                return false;
+            }
+            break;
+        default:
+            context->validationError(entryPoint, GL_INVALID_ENUM, kInvalidPname);
+            return false;
+    }
+
+    const Framebuffer *framebuffer = context->getState().getTargetFramebuffer(target);
+    ASSERT(framebuffer);
+
+    if (framebuffer->isDefault())
+    {
+        context->validationError(entryPoint, GL_INVALID_OPERATION, kDefaultFramebuffer);
+        return false;
+    }
+    return true;
+}
+
+bool ValidateGetFramebufferAttachmentParameterivRobustANGLE(const Context *context,
+                                                            angle::EntryPoint entryPoint,
+                                                            GLenum target,
+                                                            GLenum attachment,
+                                                            GLenum pname,
+                                                            GLsizei bufSize,
+                                                            const GLsizei *length,
+                                                            const GLint *params)
+{
+    if (!ValidateRobustEntryPoint(context, entryPoint, bufSize))
+    {
+        return false;
+    }
+
+    GLsizei numParams = 0;
+    if (!ValidateGetFramebufferAttachmentParameterivBase(context, entryPoint, target, attachment,
+                                                         pname, &numParams))
+    {
+        return false;
+    }
+
+    if (!ValidateRobustBufferSize(context, entryPoint, bufSize, numParams))
+    {
+        return false;
+    }
+
+    SetRobustLengthParam(length, numParams);
+
+    return true;
+}
+
+bool ValidateGetBufferParameterivRobustANGLE(const Context *context,
+                                             angle::EntryPoint entryPoint,
+                                             BufferBinding target,
+                                             GLenum pname,
+                                             GLsizei bufSize,
+                                             const GLsizei *length,
+                                             const GLint *params)
+{
+    if (!ValidateRobustEntryPoint(context, entryPoint, bufSize))
+    {
+        return false;
+    }
+
+    GLsizei numParams = 0;
+
+    if (!ValidateGetBufferParameterBase(context, entryPoint, target, pname, false, &numParams))
+    {
+        return false;
+    }
+
+    if (!ValidateRobustBufferSize(context, entryPoint, bufSize, numParams))
+    {
+        return false;
+    }
+
+    SetRobustLengthParam(length, numParams);
+    return true;
+}
+
+bool ValidateGetBufferParameteri64vRobustANGLE(const Context *context,
+                                               angle::EntryPoint entryPoint,
+                                               BufferBinding target,
+                                               GLenum pname,
+                                               GLsizei bufSize,
+                                               const GLsizei *length,
+                                               const GLint64 *params)
+{
+    GLsizei numParams = 0;
+
+    if (!ValidateRobustEntryPoint(context, entryPoint, bufSize))
+    {
+        return false;
+    }
+
+    if (!ValidateGetBufferParameterBase(context, entryPoint, target, pname, false, &numParams))
+    {
+        return false;
+    }
+
+    if (!ValidateRobustBufferSize(context, entryPoint, bufSize, numParams))
+    {
+        return false;
+    }
+
+    SetRobustLengthParam(length, numParams);
+
+    return true;
+}
+
+bool ValidateGetProgramivBase(const Context *context,
+                              angle::EntryPoint entryPoint,
+                              ShaderProgramID program,
+                              GLenum pname,
+                              GLsizei *numParams)
+{
+    // Currently, all GetProgramiv queries return 1 parameter
+    if (numParams)
+    {
+        *numParams = 1;
+    }
+
+    if (context->isContextLost())
+    {
+        context->validationError(entryPoint, GL_CONTEXT_LOST, kContextLost);
+
+        if (context->getExtensions().parallelShaderCompileKHR && pname == GL_COMPLETION_STATUS_KHR)
+        {
+            // Generate an error but still return true, the context still needs to return a
+            // value in this case.
+            return true;
+        }
+        else
+        {
+            return false;
+        }
+    }
+
+    // Special case for GL_COMPLETION_STATUS_KHR: don't resolve the link. Otherwise resolve it now.
+    Program *programObject = (pname == GL_COMPLETION_STATUS_KHR)
+                                 ? GetValidProgramNoResolve(context, entryPoint, program)
+                                 : GetValidProgram(context, entryPoint, program);
+    if (!programObject)
+    {
+        return false;
+    }
+
+    switch (pname)
+    {
+        case GL_DELETE_STATUS:
+        case GL_LINK_STATUS:
+        case GL_VALIDATE_STATUS:
+        case GL_INFO_LOG_LENGTH:
+        case GL_ATTACHED_SHADERS:
+        case GL_ACTIVE_ATTRIBUTES:
+        case GL_ACTIVE_ATTRIBUTE_MAX_LENGTH:
+        case GL_ACTIVE_UNIFORMS:
+        case GL_ACTIVE_UNIFORM_MAX_LENGTH:
+            break;
+
+        case GL_PROGRAM_BINARY_LENGTH:
+            if (context->getClientMajorVersion() < 3 &&
+                !context->getExtensions().getProgramBinaryOES)
+            {
+                context->validationErrorF(entryPoint, GL_INVALID_ENUM, kEnumNotSupported, pname);
+                return false;
+            }
+            break;
+
+        case GL_ACTIVE_UNIFORM_BLOCKS:
+        case GL_ACTIVE_UNIFORM_BLOCK_MAX_NAME_LENGTH:
+        case GL_TRANSFORM_FEEDBACK_BUFFER_MODE:
+        case GL_TRANSFORM_FEEDBACK_VARYINGS:
+        case GL_TRANSFORM_FEEDBACK_VARYING_MAX_LENGTH:
+        case GL_PROGRAM_BINARY_RETRIEVABLE_HINT:
+            if (context->getClientMajorVersion() < 3)
+            {
+                context->validationError(entryPoint, GL_INVALID_ENUM, kEnumRequiresGLES30);
+                return false;
+            }
+            break;
+
+        case GL_PROGRAM_SEPARABLE:
+        case GL_ACTIVE_ATOMIC_COUNTER_BUFFERS:
+            if (context->getClientVersion() < Version(3, 1))
+            {
+                context->validationError(entryPoint, GL_INVALID_ENUM, kEnumRequiresGLES31);
+                return false;
+            }
+            break;
+
+        case GL_COMPUTE_WORK_GROUP_SIZE:
+            if (context->getClientVersion() < Version(3, 1))
+            {
+                context->validationError(entryPoint, GL_INVALID_ENUM, kEnumRequiresGLES31);
+                return false;
+            }
+
+            // [OpenGL ES 3.1] Chapter 7.12 Page 122
+            // An INVALID_OPERATION error is generated if COMPUTE_WORK_GROUP_SIZE is queried for a
+            // program which has not been linked successfully, or which does not contain objects to
+            // form a compute shader.
+            if (!programObject->isLinked())
+            {
+                context->validationError(entryPoint, GL_INVALID_OPERATION, kProgramNotLinked);
+                return false;
+            }
+            if (!programObject->getExecutable().hasLinkedShaderStage(ShaderType::Compute))
+            {
+                context->validationError(entryPoint, GL_INVALID_OPERATION,
+                                         kNoActiveComputeShaderStage);
+                return false;
+            }
+            break;
+
+        case GL_GEOMETRY_LINKED_INPUT_TYPE_EXT:
+        case GL_GEOMETRY_LINKED_OUTPUT_TYPE_EXT:
+        case GL_GEOMETRY_LINKED_VERTICES_OUT_EXT:
+        case GL_GEOMETRY_SHADER_INVOCATIONS_EXT:
+            if (!context->getExtensions().geometryShaderAny() &&
+                context->getClientVersion() < ES_3_2)
+            {
+                context->validationError(entryPoint, GL_INVALID_ENUM,
+                                         kGeometryShaderExtensionNotEnabled);
+                return false;
+            }
+
+            // [EXT_geometry_shader] Chapter 7.12
+            // An INVALID_OPERATION error is generated if GEOMETRY_LINKED_VERTICES_OUT_EXT,
+            // GEOMETRY_LINKED_INPUT_TYPE_EXT, GEOMETRY_LINKED_OUTPUT_TYPE_EXT, or
+            // GEOMETRY_SHADER_INVOCATIONS_EXT are queried for a program which has not been linked
+            // successfully, or which does not contain objects to form a geometry shader.
+            if (!programObject->isLinked())
+            {
+                context->validationError(entryPoint, GL_INVALID_OPERATION, kProgramNotLinked);
+                return false;
+            }
+            if (!programObject->getExecutable().hasLinkedShaderStage(ShaderType::Geometry))
+            {
+                context->validationError(entryPoint, GL_INVALID_OPERATION,
+                                         kNoActiveGeometryShaderStage);
+                return false;
+            }
+            break;
+
+        case GL_COMPLETION_STATUS_KHR:
+            if (!context->getExtensions().parallelShaderCompileKHR)
+            {
+                context->validationError(entryPoint, GL_INVALID_OPERATION, kExtensionNotEnabled);
+                return false;
+            }
+            break;
+        case GL_TESS_CONTROL_OUTPUT_VERTICES_EXT:
+        case GL_TESS_GEN_MODE_EXT:
+        case GL_TESS_GEN_SPACING_EXT:
+        case GL_TESS_GEN_VERTEX_ORDER_EXT:
+        case GL_TESS_GEN_POINT_MODE_EXT:
+            if (!context->getExtensions().tessellationShaderEXT &&
+                context->getClientVersion() < ES_3_2)
+            {
+                context->validationError(entryPoint, GL_INVALID_ENUM,
+                                         kTessellationShaderExtensionNotEnabled);
+                return false;
+            }
+            if (!programObject->isLinked())
+            {
+                context->validationError(entryPoint, GL_INVALID_OPERATION, kProgramNotLinked);
+                return false;
+            }
+            break;
+        default:
+            context->validationErrorF(entryPoint, GL_INVALID_ENUM, kEnumNotSupported, pname);
+            return false;
+    }
+
+    return true;
+}
+
+bool ValidateGetProgramivRobustANGLE(const Context *context,
+                                     angle::EntryPoint entryPoint,
+                                     ShaderProgramID program,
+                                     GLenum pname,
+                                     GLsizei bufSize,
+                                     const GLsizei *length,
+                                     const GLint *params)
+{
+    if (!ValidateRobustEntryPoint(context, entryPoint, bufSize))
+    {
+        return false;
+    }
+
+    GLsizei numParams = 0;
+
+    if (!ValidateGetProgramivBase(context, entryPoint, program, pname, &numParams))
+    {
+        return false;
+    }
+
+    if (!ValidateRobustBufferSize(context, entryPoint, bufSize, numParams))
+    {
+        return false;
+    }
+
+    SetRobustLengthParam(length, numParams);
+
+    return true;
+}
+
+bool ValidateGetRenderbufferParameterivRobustANGLE(const Context *context,
+                                                   angle::EntryPoint entryPoint,
+                                                   GLenum target,
+                                                   GLenum pname,
+                                                   GLsizei bufSize,
+                                                   const GLsizei *length,
+                                                   const GLint *params)
+{
+    if (!ValidateRobustEntryPoint(context, entryPoint, bufSize))
+    {
+        return false;
+    }
+
+    GLsizei numParams = 0;
+
+    if (!ValidateGetRenderbufferParameterivBase(context, entryPoint, target, pname, &numParams))
+    {
+        return false;
+    }
+
+    if (!ValidateRobustBufferSize(context, entryPoint, bufSize, numParams))
+    {
+        return false;
+    }
+
+    SetRobustLengthParam(length, numParams);
+
+    return true;
+}
+
+bool ValidateGetShaderivRobustANGLE(const Context *context,
+                                    angle::EntryPoint entryPoint,
+                                    ShaderProgramID shader,
+                                    GLenum pname,
+                                    GLsizei bufSize,
+                                    const GLsizei *length,
+                                    const GLint *params)
+{
+    if (!ValidateRobustEntryPoint(context, entryPoint, bufSize))
+    {
+        return false;
+    }
+
+    GLsizei numParams = 0;
+
+    if (!ValidateGetShaderivBase(context, entryPoint, shader, pname, &numParams))
+    {
+        return false;
+    }
+
+    if (!ValidateRobustBufferSize(context, entryPoint, bufSize, numParams))
+    {
+        return false;
+    }
+
+    SetRobustLengthParam(length, numParams);
+
+    return true;
+}
+
+bool ValidateGetTexParameterfvRobustANGLE(const Context *context,
+                                          angle::EntryPoint entryPoint,
+                                          TextureType target,
+                                          GLenum pname,
+                                          GLsizei bufSize,
+                                          const GLsizei *length,
+                                          const GLfloat *params)
+{
+    if (!ValidateRobustEntryPoint(context, entryPoint, bufSize))
+    {
+        return false;
+    }
+
+    GLsizei numParams = 0;
+
+    if (!ValidateGetTexParameterBase(context, entryPoint, target, pname, &numParams))
+    {
+        return false;
+    }
+
+    if (!ValidateRobustBufferSize(context, entryPoint, bufSize, numParams))
+    {
+        return false;
+    }
+
+    SetRobustLengthParam(length, numParams);
+
+    return true;
+}
+
+bool ValidateGetTexParameterivRobustANGLE(const Context *context,
+                                          angle::EntryPoint entryPoint,
+                                          TextureType target,
+                                          GLenum pname,
+                                          GLsizei bufSize,
+                                          const GLsizei *length,
+                                          const GLint *params)
+{
+
+    if (!ValidateRobustEntryPoint(context, entryPoint, bufSize))
+    {
+        return false;
+    }
+    GLsizei numParams = 0;
+    if (!ValidateGetTexParameterBase(context, entryPoint, target, pname, &numParams))
+    {
+        return false;
+    }
+
+    if (!ValidateRobustBufferSize(context, entryPoint, bufSize, numParams))
+    {
+        return false;
+    }
+
+    SetRobustLengthParam(length, numParams);
+    return true;
+}
+
+bool ValidateGetTexParameterIivRobustANGLE(const Context *context,
+                                           angle::EntryPoint entryPoint,
+                                           TextureType target,
+                                           GLenum pname,
+                                           GLsizei bufSize,
+                                           const GLsizei *length,
+                                           const GLint *params)
+{
+    UNIMPLEMENTED();
+    return false;
+}
+
+bool ValidateGetTexParameterIuivRobustANGLE(const Context *context,
+                                            angle::EntryPoint entryPoint,
+                                            TextureType target,
+                                            GLenum pname,
+                                            GLsizei bufSize,
+                                            const GLsizei *length,
+                                            const GLuint *params)
+{
+    UNIMPLEMENTED();
+    return false;
+}
+
+bool ValidateTexParameterfvRobustANGLE(const Context *context,
+                                       angle::EntryPoint entryPoint,
+                                       TextureType target,
+                                       GLenum pname,
+                                       GLsizei bufSize,
+                                       const GLfloat *params)
+{
+    if (!ValidateRobustEntryPoint(context, entryPoint, bufSize))
+    {
+        return false;
+    }
+
+    return ValidateTexParameterBase(context, entryPoint, target, pname, bufSize, true, params);
+}
+
+bool ValidateTexParameterivRobustANGLE(const Context *context,
+                                       angle::EntryPoint entryPoint,
+                                       TextureType target,
+                                       GLenum pname,
+                                       GLsizei bufSize,
+                                       const GLint *params)
+{
+    if (!ValidateRobustEntryPoint(context, entryPoint, bufSize))
+    {
+        return false;
+    }
+
+    return ValidateTexParameterBase(context, entryPoint, target, pname, bufSize, true, params);
+}
+
+bool ValidateTexParameterIivRobustANGLE(const Context *context,
+                                        angle::EntryPoint entryPoint,
+                                        TextureType target,
+                                        GLenum pname,
+                                        GLsizei bufSize,
+                                        const GLint *params)
+{
+    UNIMPLEMENTED();
+    return false;
+}
+
+bool ValidateTexParameterIuivRobustANGLE(const Context *context,
+                                         angle::EntryPoint entryPoint,
+                                         TextureType target,
+                                         GLenum pname,
+                                         GLsizei bufSize,
+                                         const GLuint *params)
+{
+    UNIMPLEMENTED();
+    return false;
+}
+
+bool ValidateGetSamplerParameterfvRobustANGLE(const Context *context,
+                                              angle::EntryPoint entryPoint,
+                                              SamplerID sampler,
+                                              GLenum pname,
+                                              GLsizei bufSize,
+                                              const GLsizei *length,
+                                              const GLfloat *params)
+{
+    if (!ValidateRobustEntryPoint(context, entryPoint, bufSize))
+    {
+        return false;
+    }
+
+    GLsizei numParams = 0;
+
+    if (!ValidateGetSamplerParameterBase(context, entryPoint, sampler, pname, &numParams))
+    {
+        return false;
+    }
+
+    if (!ValidateRobustBufferSize(context, entryPoint, bufSize, numParams))
+    {
+        return false;
+    }
+
+    SetRobustLengthParam(length, numParams);
+    return true;
+}
+
+bool ValidateGetSamplerParameterivRobustANGLE(const Context *context,
+                                              angle::EntryPoint entryPoint,
+                                              SamplerID sampler,
+                                              GLenum pname,
+                                              GLsizei bufSize,
+                                              const GLsizei *length,
+                                              const GLint *params)
+{
+    if (!ValidateRobustEntryPoint(context, entryPoint, bufSize))
+    {
+        return false;
+    }
+
+    GLsizei numParams = 0;
+
+    if (!ValidateGetSamplerParameterBase(context, entryPoint, sampler, pname, &numParams))
+    {
+        return false;
+    }
+
+    if (!ValidateRobustBufferSize(context, entryPoint, bufSize, numParams))
+    {
+        return false;
+    }
+
+    SetRobustLengthParam(length, numParams);
+    return true;
+}
+
+bool ValidateGetSamplerParameterIivRobustANGLE(const Context *context,
+                                               angle::EntryPoint entryPoint,
+                                               SamplerID sampler,
+                                               GLenum pname,
+                                               GLsizei bufSize,
+                                               const GLsizei *length,
+                                               const GLint *params)
+{
+    UNIMPLEMENTED();
+    return false;
+}
+
+bool ValidateGetSamplerParameterIuivRobustANGLE(const Context *context,
+                                                angle::EntryPoint entryPoint,
+                                                SamplerID sampler,
+                                                GLenum pname,
+                                                GLsizei bufSize,
+                                                const GLsizei *length,
+                                                const GLuint *params)
+{
+    UNIMPLEMENTED();
+    return false;
+}
+
+bool ValidateSamplerParameterfvRobustANGLE(const Context *context,
+                                           angle::EntryPoint entryPoint,
+                                           SamplerID sampler,
+                                           GLenum pname,
+                                           GLsizei bufSize,
+                                           const GLfloat *params)
+{
+    if (!ValidateRobustEntryPoint(context, entryPoint, bufSize))
+    {
+        return false;
+    }
+
+    return ValidateSamplerParameterBase(context, entryPoint, sampler, pname, bufSize, true, params);
+}
+
+bool ValidateSamplerParameterivRobustANGLE(const Context *context,
+                                           angle::EntryPoint entryPoint,
+                                           SamplerID sampler,
+                                           GLenum pname,
+                                           GLsizei bufSize,
+                                           const GLint *params)
+{
+    if (!ValidateRobustEntryPoint(context, entryPoint, bufSize))
+    {
+        return false;
+    }
+
+    return ValidateSamplerParameterBase(context, entryPoint, sampler, pname, bufSize, true, params);
+}
+
+bool ValidateSamplerParameterIivRobustANGLE(const Context *context,
+                                            angle::EntryPoint entryPoint,
+                                            SamplerID sampler,
+                                            GLenum pname,
+                                            GLsizei bufSize,
+                                            const GLint *param)
+{
+    UNIMPLEMENTED();
+    return false;
+}
+
+bool ValidateSamplerParameterIuivRobustANGLE(const Context *context,
+                                             angle::EntryPoint entryPoint,
+                                             SamplerID sampler,
+                                             GLenum pname,
+                                             GLsizei bufSize,
+                                             const GLuint *param)
+{
+    UNIMPLEMENTED();
+    return false;
+}
+
+bool ValidateGetVertexAttribfvRobustANGLE(const Context *context,
+                                          angle::EntryPoint entryPoint,
+                                          GLuint index,
+                                          GLenum pname,
+                                          GLsizei bufSize,
+                                          const GLsizei *length,
+                                          const GLfloat *params)
+{
+    if (!ValidateRobustEntryPoint(context, entryPoint, bufSize))
+    {
+        return false;
+    }
+
+    GLsizei writeLength = 0;
+
+    if (!ValidateGetVertexAttribBase(context, entryPoint, index, pname, &writeLength, false, false))
+    {
+        return false;
+    }
+
+    if (!ValidateRobustBufferSize(context, entryPoint, bufSize, writeLength))
+    {
+        return false;
+    }
+
+    SetRobustLengthParam(length, writeLength);
+    return true;
+}
+
+bool ValidateGetVertexAttribivRobustANGLE(const Context *context,
+                                          angle::EntryPoint entryPoint,
+                                          GLuint index,
+                                          GLenum pname,
+                                          GLsizei bufSize,
+                                          const GLsizei *length,
+                                          const GLint *params)
+{
+    if (!ValidateRobustEntryPoint(context, entryPoint, bufSize))
+    {
+        return false;
+    }
+
+    GLsizei writeLength = 0;
+
+    if (!ValidateGetVertexAttribBase(context, entryPoint, index, pname, &writeLength, false, false))
+    {
+        return false;
+    }
+
+    if (!ValidateRobustBufferSize(context, entryPoint, bufSize, writeLength))
+    {
+        return false;
+    }
+
+    SetRobustLengthParam(length, writeLength);
+
+    return true;
+}
+
+bool ValidateGetVertexAttribPointervRobustANGLE(const Context *context,
+                                                angle::EntryPoint entryPoint,
+                                                GLuint index,
+                                                GLenum pname,
+                                                GLsizei bufSize,
+                                                const GLsizei *length,
+                                                void *const *pointer)
+{
+    if (!ValidateRobustEntryPoint(context, entryPoint, bufSize))
+    {
+        return false;
+    }
+
+    GLsizei writeLength = 0;
+
+    if (!ValidateGetVertexAttribBase(context, entryPoint, index, pname, &writeLength, true, false))
+    {
+        return false;
+    }
+
+    if (!ValidateRobustBufferSize(context, entryPoint, bufSize, writeLength))
+    {
+        return false;
+    }
+
+    SetRobustLengthParam(length, writeLength);
+
+    return true;
+}
+
+bool ValidateGetVertexAttribIivRobustANGLE(const Context *context,
+                                           angle::EntryPoint entryPoint,
+                                           GLuint index,
+                                           GLenum pname,
+                                           GLsizei bufSize,
+                                           const GLsizei *length,
+                                           const GLint *params)
+{
+    if (!ValidateRobustEntryPoint(context, entryPoint, bufSize))
+    {
+        return false;
+    }
+
+    GLsizei writeLength = 0;
+
+    if (!ValidateGetVertexAttribBase(context, entryPoint, index, pname, &writeLength, false, true))
+    {
+        return false;
+    }
+
+    if (!ValidateRobustBufferSize(context, entryPoint, bufSize, writeLength))
+    {
+        return false;
+    }
+
+    SetRobustLengthParam(length, writeLength);
+
+    return true;
+}
+
+bool ValidateGetVertexAttribIuivRobustANGLE(const Context *context,
+                                            angle::EntryPoint entryPoint,
+                                            GLuint index,
+                                            GLenum pname,
+                                            GLsizei bufSize,
+                                            const GLsizei *length,
+                                            const GLuint *params)
+{
+    if (!ValidateRobustEntryPoint(context, entryPoint, bufSize))
+    {
+        return false;
+    }
+
+    GLsizei writeLength = 0;
+
+    if (!ValidateGetVertexAttribBase(context, entryPoint, index, pname, &writeLength, false, true))
+    {
+        return false;
+    }
+
+    if (!ValidateRobustBufferSize(context, entryPoint, bufSize, writeLength))
+    {
+        return false;
+    }
+
+    SetRobustLengthParam(length, writeLength);
+
+    return true;
+}
+
+bool ValidateGetActiveUniformBlockivRobustANGLE(const Context *context,
+                                                angle::EntryPoint entryPoint,
+                                                ShaderProgramID program,
+                                                UniformBlockIndex uniformBlockIndex,
+                                                GLenum pname,
+                                                GLsizei bufSize,
+                                                const GLsizei *length,
+                                                const GLint *params)
+{
+    if (!ValidateRobustEntryPoint(context, entryPoint, bufSize))
+    {
+        return false;
+    }
+
+    GLsizei writeLength = 0;
+
+    if (!ValidateGetActiveUniformBlockivBase(context, entryPoint, program, uniformBlockIndex, pname,
+                                             &writeLength))
+    {
+        return false;
+    }
+
+    if (!ValidateRobustBufferSize(context, entryPoint, bufSize, writeLength))
+    {
+        return false;
+    }
+
+    SetRobustLengthParam(length, writeLength);
+
+    return true;
+}
+
+bool ValidateGetInternalformativRobustANGLE(const Context *context,
+                                            angle::EntryPoint entryPoint,
+                                            GLenum target,
+                                            GLenum internalformat,
+                                            GLenum pname,
+                                            GLsizei bufSize,
+                                            const GLsizei *length,
+                                            const GLint *params)
+{
+    if (!ValidateRobustEntryPoint(context, entryPoint, bufSize))
+    {
+        return false;
+    }
+
+    GLsizei numParams = 0;
+
+    if (!ValidateGetInternalFormativBase(context, entryPoint, target, internalformat, pname,
+                                         bufSize, &numParams))
+    {
+        return false;
+    }
+
+    if (!ValidateRobustBufferSize(context, entryPoint, bufSize, numParams))
+    {
+        return false;
+    }
+
+    SetRobustLengthParam(length, numParams);
+
+    return true;
+}
+
+// Perform validation from WebGL 2 section 5.10 "Invalid Clears":
+// In the WebGL 2 API, trying to perform a clear when there is a mismatch between the type of the
+// specified clear value and the type of a buffer that is being cleared generates an
+// INVALID_OPERATION error instead of producing undefined results
+bool ValidateWebGLFramebufferAttachmentClearType(const Context *context,
+                                                 angle::EntryPoint entryPoint,
+                                                 GLint drawbuffer,
+                                                 const GLenum *validComponentTypes,
+                                                 size_t validComponentTypeCount)
+{
+    const FramebufferAttachment *attachment =
+        context->getState().getDrawFramebuffer()->getDrawBuffer(drawbuffer);
+    if (attachment)
+    {
+        GLenum componentType = attachment->getFormat().info->componentType;
+        const GLenum *end    = validComponentTypes + validComponentTypeCount;
+        if (std::find(validComponentTypes, end, componentType) == end)
+        {
+            context->validationError(entryPoint, GL_INVALID_OPERATION, kNoDefinedClearConversion);
+            return false;
+        }
+    }
+
+    return true;
+}
+
+bool ValidateRobustCompressedTexImageBase(const Context *context,
+                                          angle::EntryPoint entryPoint,
+                                          GLsizei imageSize,
+                                          GLsizei dataSize)
+{
+    if (!ValidateRobustEntryPoint(context, entryPoint, dataSize))
+    {
+        return false;
+    }
+
+    Buffer *pixelUnpackBuffer = context->getState().getTargetBuffer(BufferBinding::PixelUnpack);
+    if (pixelUnpackBuffer == nullptr)
+    {
+        if (dataSize < imageSize)
+        {
+            context->validationError(entryPoint, GL_INVALID_OPERATION, kCompressedDataSizeTooSmall);
+        }
+    }
+    return true;
+}
+
+bool ValidateGetBufferParameterBase(const Context *context,
+                                    angle::EntryPoint entryPoint,
+                                    BufferBinding target,
+                                    GLenum pname,
+                                    bool pointerVersion,
+                                    GLsizei *numParams)
+{
+    if (numParams)
+    {
+        *numParams = 0;
+    }
+
+    if (!context->isValidBufferBinding(target))
+    {
+        context->validationError(entryPoint, GL_INVALID_ENUM, kInvalidBufferTypes);
+        return false;
+    }
+
+    const Buffer *buffer = context->getState().getTargetBuffer(target);
+    if (!buffer)
+    {
+        // A null buffer means that "0" is bound to the requested buffer target
+        context->validationError(entryPoint, GL_INVALID_OPERATION, kBufferNotBound);
+        return false;
+    }
+
+    const Extensions &extensions = context->getExtensions();
+
+    switch (pname)
+    {
+        case GL_BUFFER_USAGE:
+        case GL_BUFFER_SIZE:
+            break;
+
+        case GL_BUFFER_ACCESS_OES:
+            if (!extensions.mapbufferOES)
+            {
+                context->validationErrorF(entryPoint, GL_INVALID_ENUM, kEnumNotSupported, pname);
+                return false;
+            }
+            break;
+
+        case GL_BUFFER_MAPPED:
+            static_assert(GL_BUFFER_MAPPED == GL_BUFFER_MAPPED_OES, "GL enums should be equal.");
+            if (context->getClientMajorVersion() < 3 && !extensions.mapbufferOES &&
+                !extensions.mapBufferRangeEXT)
+            {
+                context->validationErrorF(entryPoint, GL_INVALID_ENUM, kEnumNotSupported, pname);
+                return false;
+            }
+            break;
+
+        case GL_BUFFER_MAP_POINTER:
+            if (!pointerVersion)
+            {
+                context->validationError(entryPoint, GL_INVALID_ENUM, kInvalidMapPointerQuery);
+                return false;
+            }
+            break;
+
+        case GL_BUFFER_ACCESS_FLAGS:
+        case GL_BUFFER_MAP_OFFSET:
+        case GL_BUFFER_MAP_LENGTH:
+            if (context->getClientMajorVersion() < 3 && !extensions.mapBufferRangeEXT)
+            {
+                context->validationErrorF(entryPoint, GL_INVALID_ENUM, kEnumNotSupported, pname);
+                return false;
+            }
+            break;
+
+        case GL_MEMORY_SIZE_ANGLE:
+            if (!context->getExtensions().memorySizeANGLE)
+            {
+                context->validationError(entryPoint, GL_INVALID_ENUM, kExtensionNotEnabled);
+                return false;
+            }
+            break;
+
+        case GL_RESOURCE_INITIALIZED_ANGLE:
+            if (!context->getExtensions().robustResourceInitializationANGLE)
+            {
+                context->validationError(entryPoint, GL_INVALID_ENUM,
+                                         kRobustResourceInitializationExtensionRequired);
+                return false;
+            }
+            break;
+
+        default:
+            context->validationErrorF(entryPoint, GL_INVALID_ENUM, kEnumNotSupported, pname);
+            return false;
+    }
+
+    // All buffer parameter queries return one value.
+    if (numParams)
+    {
+        *numParams = 1;
+    }
+
+    return true;
+}
+
+bool ValidateGetRenderbufferParameterivBase(const Context *context,
+                                            angle::EntryPoint entryPoint,
+                                            GLenum target,
+                                            GLenum pname,
+                                            GLsizei *length)
+{
+    if (length)
+    {
+        *length = 0;
+    }
+
+    if (target != GL_RENDERBUFFER)
+    {
+        context->validationError(entryPoint, GL_INVALID_ENUM, kInvalidRenderbufferTarget);
+        return false;
+    }
+
+    Renderbuffer *renderbuffer = context->getState().getCurrentRenderbuffer();
+    if (renderbuffer == nullptr)
+    {
+        context->validationError(entryPoint, GL_INVALID_OPERATION, kRenderbufferNotBound);
+        return false;
+    }
+
+    switch (pname)
+    {
+        case GL_RENDERBUFFER_WIDTH:
+        case GL_RENDERBUFFER_HEIGHT:
+        case GL_RENDERBUFFER_INTERNAL_FORMAT:
+        case GL_RENDERBUFFER_RED_SIZE:
+        case GL_RENDERBUFFER_GREEN_SIZE:
+        case GL_RENDERBUFFER_BLUE_SIZE:
+        case GL_RENDERBUFFER_ALPHA_SIZE:
+        case GL_RENDERBUFFER_DEPTH_SIZE:
+        case GL_RENDERBUFFER_STENCIL_SIZE:
+            break;
+
+        case GL_RENDERBUFFER_SAMPLES_ANGLE:
+            if (context->getClientMajorVersion() < 3 &&
+                !context->getExtensions().framebufferMultisampleANGLE)
+            {
+                context->validationError(entryPoint, GL_INVALID_ENUM, kExtensionNotEnabled);
+                return false;
+            }
+            break;
+
+        case GL_MEMORY_SIZE_ANGLE:
+            if (!context->getExtensions().memorySizeANGLE)
+            {
+                context->validationError(entryPoint, GL_INVALID_ENUM, kExtensionNotEnabled);
+                return false;
+            }
+            break;
+
+        case GL_IMPLEMENTATION_COLOR_READ_FORMAT:
+        case GL_IMPLEMENTATION_COLOR_READ_TYPE:
+            if (!context->getExtensions().getImageANGLE)
+            {
+                context->validationError(entryPoint, GL_INVALID_ENUM, kGetImageExtensionNotEnabled);
+                return false;
+            }
+            break;
+
+        case GL_RESOURCE_INITIALIZED_ANGLE:
+            if (!context->getExtensions().robustResourceInitializationANGLE)
+            {
+                context->validationError(entryPoint, GL_INVALID_ENUM,
+                                         kRobustResourceInitializationExtensionRequired);
+                return false;
+            }
+            break;
+
+        default:
+            context->validationErrorF(entryPoint, GL_INVALID_ENUM, kEnumNotSupported, pname);
+            return false;
+    }
+
+    if (length)
+    {
+        *length = 1;
+    }
+    return true;
+}
+
+bool ValidateGetShaderivBase(const Context *context,
+                             angle::EntryPoint entryPoint,
+                             ShaderProgramID shader,
+                             GLenum pname,
+                             GLsizei *length)
+{
+    if (length)
+    {
+        *length = 0;
+    }
+
+    if (context->isContextLost())
+    {
+        context->validationError(entryPoint, GL_CONTEXT_LOST, kContextLost);
+
+        if (context->getExtensions().parallelShaderCompileKHR && pname == GL_COMPLETION_STATUS_KHR)
+        {
+            // Generate an error but still return true, the context still needs to return a
+            // value in this case.
+            return true;
+        }
+        else
+        {
+            return false;
+        }
+    }
+
+    if (GetValidShader(context, entryPoint, shader) == nullptr)
+    {
+        return false;
+    }
+
+    switch (pname)
+    {
+        case GL_SHADER_TYPE:
+        case GL_DELETE_STATUS:
+        case GL_COMPILE_STATUS:
+        case GL_INFO_LOG_LENGTH:
+        case GL_SHADER_SOURCE_LENGTH:
+            break;
+
+        case GL_TRANSLATED_SHADER_SOURCE_LENGTH_ANGLE:
+            if (!context->getExtensions().translatedShaderSourceANGLE)
+            {
+                context->validationError(entryPoint, GL_INVALID_ENUM, kExtensionNotEnabled);
+                return false;
+            }
+            break;
+
+        case GL_COMPLETION_STATUS_KHR:
+            if (!context->getExtensions().parallelShaderCompileKHR)
+            {
+                context->validationError(entryPoint, GL_INVALID_OPERATION, kExtensionNotEnabled);
+                return false;
+            }
+            break;
+
+        default:
+            context->validationErrorF(entryPoint, GL_INVALID_ENUM, kEnumNotSupported, pname);
+            return false;
+    }
+
+    if (length)
+    {
+        *length = 1;
+    }
+    return true;
+}
+
+bool ValidateGetTexParameterBase(const Context *context,
+                                 angle::EntryPoint entryPoint,
+                                 TextureType target,
+                                 GLenum pname,
+                                 GLsizei *length)
+{
+    if (length)
+    {
+        *length = 0;
+    }
+
+    if ((!ValidTextureTarget(context, target) && !ValidTextureExternalTarget(context, target)) ||
+        target == TextureType::Buffer)
+    {
+        context->validationError(entryPoint, GL_INVALID_ENUM, kInvalidTextureTarget);
+        return false;
+    }
+
+    if (context->getTextureByType(target) == nullptr)
+    {
+        // Should only be possible for external textures
+        context->validationError(entryPoint, GL_INVALID_ENUM, kTextureNotBound);
+        return false;
+    }
+
+    if (context->getClientMajorVersion() == 1 && !IsValidGLES1TextureParameter(pname))
+    {
+        context->validationErrorF(entryPoint, GL_INVALID_ENUM, kEnumNotSupported, pname);
+        return false;
+    }
+
+    switch (pname)
+    {
+        case GL_TEXTURE_MAG_FILTER:
+        case GL_TEXTURE_MIN_FILTER:
+        case GL_TEXTURE_WRAP_S:
+        case GL_TEXTURE_WRAP_T:
+            break;
+
+        case GL_TEXTURE_USAGE_ANGLE:
+            if (!context->getExtensions().textureUsageANGLE)
+            {
+                context->validationErrorF(entryPoint, GL_INVALID_ENUM, kEnumNotSupported, pname);
+                return false;
+            }
+            break;
+
+        case GL_TEXTURE_MAX_ANISOTROPY_EXT:
+            if (!ValidateTextureMaxAnisotropyExtensionEnabled(context, entryPoint))
+            {
+                return false;
+            }
+            break;
+
+        case GL_TEXTURE_IMMUTABLE_FORMAT:
+            if (context->getClientMajorVersion() < 3 && !context->getExtensions().textureStorageEXT)
+            {
+                context->validationErrorF(entryPoint, GL_INVALID_ENUM, kEnumNotSupported, pname);
+                return false;
+            }
+            break;
+
+        case GL_TEXTURE_WRAP_R:
+        case GL_TEXTURE_IMMUTABLE_LEVELS:
+        case GL_TEXTURE_SWIZZLE_R:
+        case GL_TEXTURE_SWIZZLE_G:
+        case GL_TEXTURE_SWIZZLE_B:
+        case GL_TEXTURE_SWIZZLE_A:
+        case GL_TEXTURE_BASE_LEVEL:
+        case GL_TEXTURE_MAX_LEVEL:
+        case GL_TEXTURE_MIN_LOD:
+        case GL_TEXTURE_MAX_LOD:
+            if (context->getClientMajorVersion() < 3)
+            {
+                context->validationError(entryPoint, GL_INVALID_ENUM, kEnumRequiresGLES30);
+                return false;
+            }
+            break;
+
+        case GL_TEXTURE_COMPARE_MODE:
+        case GL_TEXTURE_COMPARE_FUNC:
+            if (context->getClientMajorVersion() < 3 && !context->getExtensions().shadowSamplersEXT)
+            {
+                context->validationErrorF(entryPoint, GL_INVALID_ENUM, kEnumNotSupported, pname);
+                return false;
+            }
+            break;
+
+        case GL_TEXTURE_SRGB_DECODE_EXT:
+            if (!context->getExtensions().textureSRGBDecodeEXT)
+            {
+                context->validationErrorF(entryPoint, GL_INVALID_ENUM, kEnumNotSupported, pname);
+                return false;
+            }
+            break;
+
+        case GL_DEPTH_STENCIL_TEXTURE_MODE:
+        case GL_IMAGE_FORMAT_COMPATIBILITY_TYPE:
+            if (context->getClientVersion() < ES_3_1)
+            {
+                context->validationError(entryPoint, GL_INVALID_ENUM, kEnumRequiresGLES31);
+                return false;
+            }
+            break;
+
+        case GL_GENERATE_MIPMAP:
+        case GL_TEXTURE_CROP_RECT_OES:
+            // TODO(lfy@google.com): Restrict to GL_OES_draw_texture
+            // after GL_OES_draw_texture functionality implemented
+            if (context->getClientMajorVersion() > 1)
+            {
+                context->validationError(entryPoint, GL_INVALID_ENUM, kGLES1Only);
+                return false;
+            }
+            break;
+
+        case GL_MEMORY_SIZE_ANGLE:
+            if (!context->getExtensions().memorySizeANGLE)
+            {
+                context->validationErrorF(entryPoint, GL_INVALID_ENUM, kEnumNotSupported, pname);
+                return false;
+            }
+            break;
+
+        case GL_TEXTURE_BORDER_COLOR:
+            if (!context->getExtensions().textureBorderClampOES &&
+                context->getClientVersion() < ES_3_2)
+            {
+                context->validationError(entryPoint, GL_INVALID_ENUM, kExtensionNotEnabled);
+                return false;
+            }
+            break;
+
+        case GL_TEXTURE_NATIVE_ID_ANGLE:
+            if (!context->getExtensions().textureExternalUpdateANGLE)
+            {
+                context->validationError(entryPoint, GL_INVALID_ENUM, kExtensionNotEnabled);
+                return false;
+            }
+            break;
+
+        case GL_IMPLEMENTATION_COLOR_READ_FORMAT:
+        case GL_IMPLEMENTATION_COLOR_READ_TYPE:
+            if (!context->getExtensions().getImageANGLE)
+            {
+                context->validationError(entryPoint, GL_INVALID_ENUM, kGetImageExtensionNotEnabled);
+                return false;
+            }
+            break;
+
+        case GL_RESOURCE_INITIALIZED_ANGLE:
+            if (!context->getExtensions().robustResourceInitializationANGLE)
+            {
+                context->validationError(entryPoint, GL_INVALID_ENUM,
+                                         kRobustResourceInitializationExtensionRequired);
+                return false;
+            }
+            break;
+
+        case GL_TEXTURE_PROTECTED_EXT:
+            if (!context->getExtensions().protectedTexturesEXT)
+            {
+                context->validationError(entryPoint, GL_INVALID_ENUM,
+                                         kProtectedTexturesExtensionRequired);
+                return false;
+            }
+            break;
+
+        case GL_REQUIRED_TEXTURE_IMAGE_UNITS_OES:
+            break;
+
+        default:
+            context->validationErrorF(entryPoint, GL_INVALID_ENUM, kEnumNotSupported, pname);
+            return false;
+    }
+
+    if (length)
+    {
+        *length = GetTexParameterCount(pname);
+    }
+    return true;
+}
+
+bool ValidateGetVertexAttribBase(const Context *context,
+                                 angle::EntryPoint entryPoint,
+                                 GLuint index,
+                                 GLenum pname,
+                                 GLsizei *length,
+                                 bool pointer,
+                                 bool pureIntegerEntryPoint)
+{
+    if (length)
+    {
+        *length = 0;
+    }
+
+    if (pureIntegerEntryPoint && context->getClientMajorVersion() < 3)
+    {
+        context->validationError(entryPoint, GL_INVALID_OPERATION, kES3Required);
+        return false;
+    }
+
+    if (index >= static_cast<GLuint>(context->getCaps().maxVertexAttributes))
+    {
+        context->validationError(entryPoint, GL_INVALID_VALUE, kIndexExceedsMaxVertexAttribute);
+        return false;
+    }
+
+    if (pointer)
+    {
+        if (pname != GL_VERTEX_ATTRIB_ARRAY_POINTER)
+        {
+            context->validationErrorF(entryPoint, GL_INVALID_ENUM, kEnumNotSupported, pname);
+            return false;
+        }
+    }
+    else
+    {
+        switch (pname)
+        {
+            case GL_VERTEX_ATTRIB_ARRAY_ENABLED:
+            case GL_VERTEX_ATTRIB_ARRAY_SIZE:
+            case GL_VERTEX_ATTRIB_ARRAY_STRIDE:
+            case GL_VERTEX_ATTRIB_ARRAY_TYPE:
+            case GL_VERTEX_ATTRIB_ARRAY_NORMALIZED:
+            case GL_VERTEX_ATTRIB_ARRAY_BUFFER_BINDING:
+            case GL_CURRENT_VERTEX_ATTRIB:
+                break;
+
+            case GL_VERTEX_ATTRIB_ARRAY_DIVISOR:
+                static_assert(
+                    GL_VERTEX_ATTRIB_ARRAY_DIVISOR == GL_VERTEX_ATTRIB_ARRAY_DIVISOR_ANGLE,
+                    "ANGLE extension enums not equal to GL enums.");
+                if (context->getClientMajorVersion() < 3 &&
+                    !context->getExtensions().instancedArraysAny())
+                {
+                    context->validationErrorF(entryPoint, GL_INVALID_ENUM, kEnumNotSupported,
+                                              pname);
+                    return false;
+                }
+                break;
+
+            case GL_VERTEX_ATTRIB_ARRAY_INTEGER:
+                if (context->getClientMajorVersion() < 3)
+                {
+                    context->validationErrorF(entryPoint, GL_INVALID_ENUM, kEnumNotSupported,
+                                              pname);
+                    return false;
+                }
+                break;
+
+            case GL_VERTEX_ATTRIB_BINDING:
+            case GL_VERTEX_ATTRIB_RELATIVE_OFFSET:
+                if (context->getClientVersion() < ES_3_1)
+                {
+                    context->validationError(entryPoint, GL_INVALID_ENUM, kEnumRequiresGLES31);
+                    return false;
+                }
+                break;
+
+            default:
+                context->validationErrorF(entryPoint, GL_INVALID_ENUM, kEnumNotSupported, pname);
+                return false;
+        }
+    }
+
+    if (length)
+    {
+        if (pname == GL_CURRENT_VERTEX_ATTRIB)
+        {
+            *length = 4;
+        }
+        else
+        {
+            *length = 1;
+        }
+    }
+
+    return true;
+}
+
+bool ValidatePixelPack(const Context *context,
+                       angle::EntryPoint entryPoint,
+                       GLenum format,
+                       GLenum type,
+                       GLint x,
+                       GLint y,
+                       GLsizei width,
+                       GLsizei height,
+                       GLsizei bufSize,
+                       GLsizei *length,
+                       const void *pixels)
+{
+    // Check for pixel pack buffer related API errors
+    Buffer *pixelPackBuffer = context->getState().getTargetBuffer(BufferBinding::PixelPack);
+    if (pixelPackBuffer != nullptr && pixelPackBuffer->isMapped())
+    {
+        // ...the buffer object's data store is currently mapped.
+        context->validationError(entryPoint, GL_INVALID_OPERATION, kBufferMapped);
+        return false;
+    }
+    if (pixelPackBuffer != nullptr &&
+        pixelPackBuffer->hasWebGLXFBBindingConflict(context->isWebGL()))
+    {
+        context->validationError(entryPoint, GL_INVALID_OPERATION,
+                                 kPixelPackBufferBoundForTransformFeedback);
+        return false;
+    }
+
+    // ..  the data would be packed to the buffer object such that the memory writes required
+    // would exceed the data store size.
+    const InternalFormat &formatInfo = GetInternalFormatInfo(format, type);
+    const Extents size(width, height, 1);
+    const auto &pack = context->getState().getPackState();
+
+    GLuint endByte = 0;
+    if (!formatInfo.computePackUnpackEndByte(type, size, pack, false, &endByte))
+    {
+        context->validationError(entryPoint, GL_INVALID_OPERATION, kIntegerOverflow);
+        return false;
+    }
+
+    if (bufSize >= 0)
+    {
+        if (pixelPackBuffer == nullptr && static_cast<size_t>(bufSize) < endByte)
+        {
+            context->validationError(entryPoint, GL_INVALID_OPERATION, kInsufficientBufferSize);
+            return false;
+        }
+    }
+
+    if (pixelPackBuffer != nullptr)
+    {
+        CheckedNumeric<size_t> checkedEndByte(endByte);
+        CheckedNumeric<size_t> checkedOffset(reinterpret_cast<size_t>(pixels));
+        checkedEndByte += checkedOffset;
+
+        if (checkedEndByte.ValueOrDie() > static_cast<size_t>(pixelPackBuffer->getSize()))
+        {
+            // Overflow past the end of the buffer
+            context->validationError(entryPoint, GL_INVALID_OPERATION, kParamOverflow);
+            return false;
+        }
+    }
+
+    if (pixelPackBuffer == nullptr && length != nullptr)
+    {
+        if (endByte > static_cast<size_t>(std::numeric_limits<GLsizei>::max()))
+        {
+            context->validationError(entryPoint, GL_INVALID_OPERATION, kIntegerOverflow);
+            return false;
+        }
+
+        *length = static_cast<GLsizei>(endByte);
+    }
+
+    if (context->isWebGL())
+    {
+        // WebGL 2.0 disallows the scenario:
+        //   GL_PACK_SKIP_PIXELS + width > DataStoreWidth
+        // where:
+        //   DataStoreWidth = (GL_PACK_ROW_LENGTH ? GL_PACK_ROW_LENGTH : width)
+        // Since these two pack parameters can only be set to non-zero values
+        // on WebGL 2.0 contexts, verify them for all WebGL contexts.
+        GLint dataStoreWidth = pack.rowLength ? pack.rowLength : width;
+        if (pack.skipPixels + width > dataStoreWidth)
+        {
+            context->validationError(entryPoint, GL_INVALID_OPERATION,
+                                     kInvalidPackParametersForWebGL);
+            return false;
+        }
+    }
+
+    return true;
+}
+
+bool ValidateReadPixelsBase(const Context *context,
+                            angle::EntryPoint entryPoint,
+                            GLint x,
+                            GLint y,
+                            GLsizei width,
+                            GLsizei height,
+                            GLenum format,
+                            GLenum type,
+                            GLsizei bufSize,
+                            GLsizei *length,
+                            GLsizei *columns,
+                            GLsizei *rows,
+                            const void *pixels)
+{
+    if (length != nullptr)
+    {
+        *length = 0;
+    }
+    if (rows != nullptr)
+    {
+        *rows = 0;
+    }
+    if (columns != nullptr)
+    {
+        *columns = 0;
+    }
+
+    if (width < 0 || height < 0)
+    {
+        context->validationError(entryPoint, GL_INVALID_VALUE, kNegativeSize);
+        return false;
+    }
+
+    Framebuffer *readFramebuffer = context->getState().getReadFramebuffer();
+    ASSERT(readFramebuffer);
+
+    if (!ValidateFramebufferComplete(context, entryPoint, readFramebuffer))
+    {
+        return false;
+    }
+
+    // needIntrinsic = true. Treat renderToTexture textures as single sample since they will be
+    // resolved before reading.
+    if (!readFramebuffer->isDefault() &&
+        !ValidateFramebufferNotMultisampled(context, entryPoint, readFramebuffer, true))
+    {
+        return false;
+    }
+
+    if (readFramebuffer->getReadBufferState() == GL_NONE)
+    {
+        context->validationError(entryPoint, GL_INVALID_OPERATION, kReadBufferNone);
+        return false;
+    }
+
+    const FramebufferAttachment *readBuffer = nullptr;
+    switch (format)
+    {
+        case GL_DEPTH_COMPONENT:
+            readBuffer = readFramebuffer->getDepthAttachment();
+            break;
+        case GL_STENCIL_INDEX_OES:
+        case GL_DEPTH_STENCIL_OES:
+            readBuffer = readFramebuffer->getStencilOrDepthStencilAttachment();
+            break;
+        default:
+            readBuffer = readFramebuffer->getReadColorAttachment();
+            break;
+    }
+
+    // OVR_multiview2, Revision 1:
+    // ReadPixels generates an INVALID_FRAMEBUFFER_OPERATION error if
+    // the number of views in the current read framebuffer is more than one.
+    if (readFramebuffer->readDisallowedByMultiview())
+    {
+        context->validationError(entryPoint, GL_INVALID_FRAMEBUFFER_OPERATION,
+                                 kMultiviewReadFramebuffer);
+        return false;
+    }
+
+    if (context->isWebGL())
+    {
+        // The ES 2.0 spec states that the format must be "among those defined in table 3.4,
+        // excluding formats LUMINANCE and LUMINANCE_ALPHA.".  This requires validating the format
+        // and type before validating the combination of format and type.  However, the
+        // dEQP-GLES3.functional.negative_api.buffer.read_pixels passes GL_LUMINANCE as a format and
+        // verifies that GL_INVALID_OPERATION is generated.
+        // TODO(geofflang): Update this check to be done in all/no cases once this is resolved in
+        // dEQP/WebGL.
+        if (!ValidReadPixelsFormatEnum(context, format))
+        {
+            context->validationError(entryPoint, GL_INVALID_ENUM, kInvalidFormat);
+            return false;
+        }
+
+        if (!ValidReadPixelsTypeEnum(context, type))
+        {
+            context->validationError(entryPoint, GL_INVALID_ENUM, kInvalidType);
+            return false;
+        }
+    }
+
+    // WebGL 1.0 [Section 6.26] Reading From a Missing Attachment
+    // In OpenGL ES it is undefined what happens when an operation tries to read from a missing
+    // attachment and WebGL defines it to be an error. We do the check unconditionally as the
+    // situation is an application error that would lead to a crash in ANGLE.
+    if (readBuffer == nullptr)
+    {
+        context->validationError(entryPoint, GL_INVALID_OPERATION, kMissingReadAttachment);
+        return false;
+    }
+
+    GLenum currentFormat = GL_NONE;
+    GLenum currentType   = GL_NONE;
+
+    switch (format)
+    {
+        case GL_DEPTH_COMPONENT:
+        case GL_STENCIL_INDEX_OES:
+        case GL_DEPTH_STENCIL_OES:
+            // Only rely on ValidReadPixelsFormatType for depth/stencil formats
+            break;
+        default:
+            currentFormat = readFramebuffer->getImplementationColorReadFormat(context);
+            currentType   = readFramebuffer->getImplementationColorReadType(context);
+            break;
+    }
+
+    bool validFormatTypeCombination =
+        ValidReadPixelsFormatType(context, readBuffer->getFormat().info, format, type);
+
+    if (!(currentFormat == format && currentType == type) && !validFormatTypeCombination)
+    {
+        context->validationError(entryPoint, GL_INVALID_OPERATION, kMismatchedTypeAndFormat);
+        return false;
+    }
+
+    if (!ValidatePixelPack(context, entryPoint, format, type, x, y, width, height, bufSize, length,
+                           pixels))
+    {
+        return false;
+    }
+
+    auto getClippedExtent = [](GLint start, GLsizei length, int bufferSize, GLsizei *outExtent) {
+        angle::CheckedNumeric<int> clippedExtent(length);
+        if (start < 0)
+        {
+            // "subtract" the area that is less than 0
+            clippedExtent += start;
+        }
+
+        angle::CheckedNumeric<int> readExtent = start;
+        readExtent += length;
+        if (!readExtent.IsValid())
+        {
+            return false;
+        }
+
+        if (readExtent.ValueOrDie() > bufferSize)
+        {
+            // Subtract the region to the right of the read buffer
+            clippedExtent -= (readExtent - bufferSize);
+        }
+
+        if (!clippedExtent.IsValid())
+        {
+            return false;
+        }
+
+        *outExtent = std::max<int>(clippedExtent.ValueOrDie(), 0);
+        return true;
+    };
+
+    GLsizei writtenColumns = 0;
+    if (!getClippedExtent(x, width, readBuffer->getSize().width, &writtenColumns))
+    {
+        context->validationError(entryPoint, GL_INVALID_OPERATION, kIntegerOverflow);
+        return false;
+    }
+
+    GLsizei writtenRows = 0;
+    if (!getClippedExtent(y, height, readBuffer->getSize().height, &writtenRows))
+    {
+        context->validationError(entryPoint, GL_INVALID_OPERATION, kIntegerOverflow);
+        return false;
+    }
+
+    if (columns != nullptr)
+    {
+        *columns = writtenColumns;
+    }
+
+    if (rows != nullptr)
+    {
+        *rows = writtenRows;
+    }
+
+    return true;
+}
+
+template <typename ParamType>
+bool ValidateTexParameterBase(const Context *context,
+                              angle::EntryPoint entryPoint,
+                              TextureType target,
+                              GLenum pname,
+                              GLsizei bufSize,
+                              bool vectorParams,
+                              const ParamType *params)
+{
+    if ((!ValidTextureTarget(context, target) && !ValidTextureExternalTarget(context, target)) ||
+        target == TextureType::Buffer)
+    {
+        context->validationError(entryPoint, GL_INVALID_ENUM, kInvalidTextureTarget);
+        return false;
+    }
+
+    if (context->getTextureByType(target) == nullptr)
+    {
+        // Should only be possible for external textures
+        context->validationError(entryPoint, GL_INVALID_ENUM, kTextureNotBound);
+        return false;
+    }
+
+    const GLsizei minBufSize = GetTexParameterCount(pname);
+    if (bufSize >= 0 && bufSize < minBufSize)
+    {
+        context->validationError(entryPoint, GL_INVALID_OPERATION, kInsufficientBufferSize);
+        return false;
+    }
+
+    if (context->getClientMajorVersion() == 1 && !IsValidGLES1TextureParameter(pname))
+    {
+        context->validationErrorF(entryPoint, GL_INVALID_ENUM, kEnumNotSupported, pname);
+        return false;
+    }
+
+    switch (pname)
+    {
+        case GL_TEXTURE_WRAP_R:
+        case GL_TEXTURE_SWIZZLE_R:
+        case GL_TEXTURE_SWIZZLE_G:
+        case GL_TEXTURE_SWIZZLE_B:
+        case GL_TEXTURE_SWIZZLE_A:
+        case GL_TEXTURE_BASE_LEVEL:
+        case GL_TEXTURE_MAX_LEVEL:
+        case GL_TEXTURE_COMPARE_MODE:
+        case GL_TEXTURE_COMPARE_FUNC:
+        case GL_TEXTURE_MIN_LOD:
+        case GL_TEXTURE_MAX_LOD:
+            if (context->getClientMajorVersion() < 3 &&
+                !(pname == GL_TEXTURE_WRAP_R && context->getExtensions().texture3DOES))
+            {
+                context->validationError(entryPoint, GL_INVALID_ENUM, kES3Required);
+                return false;
+            }
+            if (target == TextureType::External &&
+                !context->getExtensions().EGLImageExternalEssl3OES)
+            {
+                context->validationErrorF(entryPoint, GL_INVALID_ENUM, kEnumNotSupported, pname);
+                return false;
+            }
+            if (target == TextureType::VideoImage && !context->getExtensions().videoTextureWEBGL)
+            {
+                context->validationErrorF(entryPoint, GL_INVALID_ENUM, kEnumNotSupported, pname);
+            }
+            break;
+
+        case GL_GENERATE_MIPMAP:
+        case GL_TEXTURE_CROP_RECT_OES:
+            if (context->getClientMajorVersion() > 1)
+            {
+                context->validationError(entryPoint, GL_INVALID_ENUM, kGLES1Only);
+                return false;
+            }
+            break;
+
+        default:
+            break;
+    }
+
+    if (target == TextureType::_2DMultisample || target == TextureType::_2DMultisampleArray)
+    {
+        switch (pname)
+        {
+            case GL_TEXTURE_MIN_FILTER:
+            case GL_TEXTURE_MAG_FILTER:
+            case GL_TEXTURE_WRAP_S:
+            case GL_TEXTURE_WRAP_T:
+            case GL_TEXTURE_WRAP_R:
+            case GL_TEXTURE_MIN_LOD:
+            case GL_TEXTURE_MAX_LOD:
+            case GL_TEXTURE_COMPARE_MODE:
+            case GL_TEXTURE_COMPARE_FUNC:
+            case GL_TEXTURE_BORDER_COLOR:
+                context->validationError(entryPoint, GL_INVALID_ENUM, kInvalidPname);
+                return false;
+        }
+    }
+
+    switch (pname)
+    {
+        case GL_TEXTURE_WRAP_S:
+        case GL_TEXTURE_WRAP_T:
+        case GL_TEXTURE_WRAP_R:
+        {
+            bool restrictedWrapModes = ((target == TextureType::External &&
+                                         !context->getExtensions().EGLImageExternalWrapModesEXT) ||
+                                        target == TextureType::Rectangle);
+            if (!ValidateTextureWrapModeValue(context, entryPoint, params, restrictedWrapModes))
+            {
+                return false;
+            }
+        }
+        break;
+
+        case GL_TEXTURE_MIN_FILTER:
+        {
+            bool restrictedMinFilter =
+                target == TextureType::External || target == TextureType::Rectangle;
+            if (!ValidateTextureMinFilterValue(context, entryPoint, params, restrictedMinFilter))
+            {
+                return false;
+            }
+        }
+        break;
+
+        case GL_TEXTURE_MAG_FILTER:
+            if (!ValidateTextureMagFilterValue(context, entryPoint, params))
+            {
+                return false;
+            }
+            break;
+
+        case GL_TEXTURE_USAGE_ANGLE:
+            if (!context->getExtensions().textureUsageANGLE)
+            {
+                context->validationErrorF(entryPoint, GL_INVALID_ENUM, kEnumNotSupported, pname);
+                return false;
+            }
+
+            switch (ConvertToGLenum(params[0]))
+            {
+                case GL_NONE:
+                case GL_FRAMEBUFFER_ATTACHMENT_ANGLE:
+                    break;
+
+                default:
+                    context->validationErrorF(entryPoint, GL_INVALID_ENUM, kEnumNotSupported,
+                                              pname);
+                    return false;
+            }
+            break;
+
+        case GL_TEXTURE_MAX_ANISOTROPY_EXT:
+        {
+            GLfloat paramValue = static_cast<GLfloat>(params[0]);
+            if (!ValidateTextureMaxAnisotropyValue(context, entryPoint, paramValue))
+            {
+                return false;
+            }
+            ASSERT(static_cast<ParamType>(paramValue) == params[0]);
+        }
+        break;
+
+        case GL_TEXTURE_MIN_LOD:
+        case GL_TEXTURE_MAX_LOD:
+            // any value is permissible
+            break;
+
+        case GL_TEXTURE_COMPARE_MODE:
+            if (!ValidateTextureCompareModeValue(context, entryPoint, params))
+            {
+                return false;
+            }
+            break;
+
+        case GL_TEXTURE_COMPARE_FUNC:
+            if (!ValidateTextureCompareFuncValue(context, entryPoint, params))
+            {
+                return false;
+            }
+            break;
+
+        case GL_TEXTURE_SWIZZLE_R:
+        case GL_TEXTURE_SWIZZLE_G:
+        case GL_TEXTURE_SWIZZLE_B:
+        case GL_TEXTURE_SWIZZLE_A:
+            switch (ConvertToGLenum(params[0]))
+            {
+                case GL_RED:
+                case GL_GREEN:
+                case GL_BLUE:
+                case GL_ALPHA:
+                case GL_ZERO:
+                case GL_ONE:
+                    break;
+
+                default:
+                    context->validationErrorF(entryPoint, GL_INVALID_ENUM, kEnumNotSupported,
+                                              pname);
+                    return false;
+            }
+            break;
+
+        case GL_TEXTURE_BASE_LEVEL:
+            if (ConvertToGLint(params[0]) < 0)
+            {
+                context->validationError(entryPoint, GL_INVALID_VALUE, kBaseLevelNegative);
+                return false;
+            }
+            if (target == TextureType::External && static_cast<GLuint>(params[0]) != 0)
+            {
+                context->validationError(entryPoint, GL_INVALID_OPERATION, kBaseLevelNonZero);
+                return false;
+            }
+            if ((target == TextureType::_2DMultisample ||
+                 target == TextureType::_2DMultisampleArray) &&
+                static_cast<GLuint>(params[0]) != 0)
+            {
+                context->validationError(entryPoint, GL_INVALID_OPERATION, kBaseLevelNonZero);
+                return false;
+            }
+            if (target == TextureType::Rectangle && static_cast<GLuint>(params[0]) != 0)
+            {
+                context->validationError(entryPoint, GL_INVALID_OPERATION, kBaseLevelNonZero);
+                return false;
+            }
+            break;
+
+        case GL_TEXTURE_MAX_LEVEL:
+            if (ConvertToGLint(params[0]) < 0)
+            {
+                context->validationError(entryPoint, GL_INVALID_VALUE, kInvalidMipLevel);
+                return false;
+            }
+            break;
+
+        case GL_DEPTH_STENCIL_TEXTURE_MODE:
+            if (context->getClientVersion() < Version(3, 1))
+            {
+                context->validationError(entryPoint, GL_INVALID_ENUM, kEnumRequiresGLES31);
+                return false;
+            }
+            switch (ConvertToGLenum(params[0]))
+            {
+                case GL_DEPTH_COMPONENT:
+                case GL_STENCIL_INDEX:
+                    break;
+
+                default:
+                    context->validationErrorF(entryPoint, GL_INVALID_ENUM, kEnumNotSupported,
+                                              pname);
+                    return false;
+            }
+            break;
+
+        case GL_TEXTURE_SRGB_DECODE_EXT:
+            if (!ValidateTextureSRGBDecodeValue(context, entryPoint, params))
+            {
+                return false;
+            }
+            break;
+
+        case GL_TEXTURE_FORMAT_SRGB_OVERRIDE_EXT:
+            if (!ValidateTextureSRGBOverrideValue(context, entryPoint, params))
+            {
+                return false;
+            }
+            break;
+
+        case GL_GENERATE_MIPMAP:
+            if (context->getClientMajorVersion() > 1)
+            {
+                context->validationError(entryPoint, GL_INVALID_ENUM, kGLES1Only);
+                return false;
+            }
+            break;
+
+        case GL_TEXTURE_CROP_RECT_OES:
+            if (context->getClientMajorVersion() > 1)
+            {
+                context->validationError(entryPoint, GL_INVALID_ENUM, kGLES1Only);
+                return false;
+            }
+            if (!vectorParams)
+            {
+                context->validationError(entryPoint, GL_INVALID_OPERATION, kInsufficientBufferSize);
+                return false;
+            }
+            break;
+
+        case GL_TEXTURE_BORDER_COLOR:
+            if (!context->getExtensions().textureBorderClampOES &&
+                context->getClientVersion() < ES_3_2)
+            {
+                context->validationError(entryPoint, GL_INVALID_ENUM, kExtensionNotEnabled);
+                return false;
+            }
+            if (!vectorParams)
+            {
+                context->validationError(entryPoint, GL_INVALID_ENUM, kInsufficientBufferSize);
+                return false;
+            }
+            break;
+
+        case GL_RESOURCE_INITIALIZED_ANGLE:
+            if (!context->getExtensions().robustResourceInitializationANGLE)
+            {
+                context->validationError(entryPoint, GL_INVALID_ENUM,
+                                         kRobustResourceInitializationExtensionRequired);
+                return false;
+            }
+            break;
+
+        case GL_TEXTURE_PROTECTED_EXT:
+            if (!context->getExtensions().protectedTexturesEXT)
+            {
+                context->validationError(entryPoint, GL_INVALID_ENUM,
+                                         kProtectedTexturesExtensionRequired);
+                return false;
+            }
+            if (ConvertToBool(params[0]) != context->getState().hasProtectedContent())
+            {
+                context->validationError(entryPoint, GL_INVALID_OPERATION,
+                                         "Protected Texture must match Protected Context");
+                return false;
+            }
+            break;
+
+        default:
+            context->validationErrorF(entryPoint, GL_INVALID_ENUM, kEnumNotSupported, pname);
+            return false;
+    }
+
+    return true;
+}
+
+template bool ValidateTexParameterBase(const Context *,
+                                       angle::EntryPoint,
+                                       TextureType,
+                                       GLenum,
+                                       GLsizei,
+                                       bool,
+                                       const GLfloat *);
+template bool ValidateTexParameterBase(const Context *,
+                                       angle::EntryPoint,
+                                       TextureType,
+                                       GLenum,
+                                       GLsizei,
+                                       bool,
+                                       const GLint *);
+template bool ValidateTexParameterBase(const Context *,
+                                       angle::EntryPoint,
+                                       TextureType,
+                                       GLenum,
+                                       GLsizei,
+                                       bool,
+                                       const GLuint *);
+
+bool ValidateGetActiveUniformBlockivBase(const Context *context,
+                                         angle::EntryPoint entryPoint,
+                                         ShaderProgramID program,
+                                         UniformBlockIndex uniformBlockIndex,
+                                         GLenum pname,
+                                         GLsizei *length)
+{
+    if (length)
+    {
+        *length = 0;
+    }
+
+    if (context->getClientMajorVersion() < 3)
+    {
+        context->validationError(entryPoint, GL_INVALID_OPERATION, kES3Required);
+        return false;
+    }
+
+    Program *programObject = GetValidProgram(context, entryPoint, program);
+    if (!programObject)
+    {
+        return false;
+    }
+
+    if (uniformBlockIndex.value >= programObject->getActiveUniformBlockCount())
+    {
+        context->validationError(entryPoint, GL_INVALID_VALUE,
+                                 kIndexExceedsActiveUniformBlockCount);
+        return false;
+    }
+
+    switch (pname)
+    {
+        case GL_UNIFORM_BLOCK_BINDING:
+        case GL_UNIFORM_BLOCK_DATA_SIZE:
+        case GL_UNIFORM_BLOCK_NAME_LENGTH:
+        case GL_UNIFORM_BLOCK_ACTIVE_UNIFORMS:
+        case GL_UNIFORM_BLOCK_ACTIVE_UNIFORM_INDICES:
+        case GL_UNIFORM_BLOCK_REFERENCED_BY_VERTEX_SHADER:
+        case GL_UNIFORM_BLOCK_REFERENCED_BY_FRAGMENT_SHADER:
+            break;
+
+        default:
+            context->validationErrorF(entryPoint, GL_INVALID_ENUM, kEnumNotSupported, pname);
+            return false;
+    }
+
+    if (length)
+    {
+        if (pname == GL_UNIFORM_BLOCK_ACTIVE_UNIFORM_INDICES)
+        {
+            const InterfaceBlock &uniformBlock =
+                programObject->getUniformBlockByIndex(uniformBlockIndex.value);
+            *length = static_cast<GLsizei>(uniformBlock.memberIndexes.size());
+        }
+        else
+        {
+            *length = 1;
+        }
+    }
+
+    return true;
+}
+
+template <typename ParamType>
+bool ValidateSamplerParameterBase(const Context *context,
+                                  angle::EntryPoint entryPoint,
+                                  SamplerID sampler,
+                                  GLenum pname,
+                                  GLsizei bufSize,
+                                  bool vectorParams,
+                                  const ParamType *params)
+{
+    if (context->getClientMajorVersion() < 3)
+    {
+        context->validationError(entryPoint, GL_INVALID_OPERATION, kES3Required);
+        return false;
+    }
+
+    if (!context->isSampler(sampler))
+    {
+        context->validationError(entryPoint, GL_INVALID_OPERATION, kInvalidSampler);
+        return false;
+    }
+
+    const GLsizei minBufSize = GetSamplerParameterCount(pname);
+    if (bufSize >= 0 && bufSize < minBufSize)
+    {
+        context->validationError(entryPoint, GL_INVALID_OPERATION, kInsufficientBufferSize);
+        return false;
+    }
+
+    switch (pname)
+    {
+        case GL_TEXTURE_WRAP_S:
+        case GL_TEXTURE_WRAP_T:
+        case GL_TEXTURE_WRAP_R:
+            if (!ValidateTextureWrapModeValue(context, entryPoint, params, false))
+            {
+                return false;
+            }
+            break;
+
+        case GL_TEXTURE_MIN_FILTER:
+            if (!ValidateTextureMinFilterValue(context, entryPoint, params, false))
+            {
+                return false;
+            }
+            break;
+
+        case GL_TEXTURE_MAG_FILTER:
+            if (!ValidateTextureMagFilterValue(context, entryPoint, params))
+            {
+                return false;
+            }
+            break;
+
+        case GL_TEXTURE_MIN_LOD:
+        case GL_TEXTURE_MAX_LOD:
+            // any value is permissible
+            break;
+
+        case GL_TEXTURE_COMPARE_MODE:
+            if (!ValidateTextureCompareModeValue(context, entryPoint, params))
+            {
+                return false;
+            }
+            break;
+
+        case GL_TEXTURE_COMPARE_FUNC:
+            if (!ValidateTextureCompareFuncValue(context, entryPoint, params))
+            {
+                return false;
+            }
+            break;
+
+        case GL_TEXTURE_SRGB_DECODE_EXT:
+            if (!ValidateTextureSRGBDecodeValue(context, entryPoint, params))
+            {
+                return false;
+            }
+            break;
+
+        case GL_TEXTURE_MAX_ANISOTROPY_EXT:
+        {
+            GLfloat paramValue = static_cast<GLfloat>(params[0]);
+            if (!ValidateTextureMaxAnisotropyValue(context, entryPoint, paramValue))
+            {
+                return false;
+            }
+        }
+        break;
+
+        case GL_TEXTURE_BORDER_COLOR:
+            if (!context->getExtensions().textureBorderClampOES &&
+                context->getClientVersion() < ES_3_2)
+            {
+                context->validationError(entryPoint, GL_INVALID_ENUM, kExtensionNotEnabled);
+                return false;
+            }
+            if (!vectorParams)
+            {
+                context->validationError(entryPoint, GL_INVALID_ENUM, kInsufficientBufferSize);
+                return false;
+            }
+            break;
+
+        default:
+            context->validationErrorF(entryPoint, GL_INVALID_ENUM, kEnumNotSupported, pname);
+            return false;
+    }
+
+    return true;
+}
+
+template bool ValidateSamplerParameterBase(const Context *,
+                                           angle::EntryPoint,
+                                           SamplerID,
+                                           GLenum,
+                                           GLsizei,
+                                           bool,
+                                           const GLfloat *);
+template bool ValidateSamplerParameterBase(const Context *,
+                                           angle::EntryPoint,
+                                           SamplerID,
+                                           GLenum,
+                                           GLsizei,
+                                           bool,
+                                           const GLint *);
+template bool ValidateSamplerParameterBase(const Context *,
+                                           angle::EntryPoint,
+                                           SamplerID,
+                                           GLenum,
+                                           GLsizei,
+                                           bool,
+                                           const GLuint *);
+
+bool ValidateGetSamplerParameterBase(const Context *context,
+                                     angle::EntryPoint entryPoint,
+                                     SamplerID sampler,
+                                     GLenum pname,
+                                     GLsizei *length)
+{
+    if (length)
+    {
+        *length = 0;
+    }
+
+    if (context->getClientMajorVersion() < 3)
+    {
+        context->validationError(entryPoint, GL_INVALID_OPERATION, kES3Required);
+        return false;
+    }
+
+    if (!context->isSampler(sampler))
+    {
+        context->validationError(entryPoint, GL_INVALID_OPERATION, kInvalidSampler);
+        return false;
+    }
+
+    switch (pname)
+    {
+        case GL_TEXTURE_WRAP_S:
+        case GL_TEXTURE_WRAP_T:
+        case GL_TEXTURE_WRAP_R:
+        case GL_TEXTURE_MIN_FILTER:
+        case GL_TEXTURE_MAG_FILTER:
+        case GL_TEXTURE_MIN_LOD:
+        case GL_TEXTURE_MAX_LOD:
+        case GL_TEXTURE_COMPARE_MODE:
+        case GL_TEXTURE_COMPARE_FUNC:
+            break;
+
+        case GL_TEXTURE_MAX_ANISOTROPY_EXT:
+            if (!ValidateTextureMaxAnisotropyExtensionEnabled(context, entryPoint))
+            {
+                return false;
+            }
+            break;
+
+        case GL_TEXTURE_SRGB_DECODE_EXT:
+            if (!context->getExtensions().textureSRGBDecodeEXT)
+            {
+                context->validationErrorF(entryPoint, GL_INVALID_ENUM, kEnumNotSupported, pname);
+                return false;
+            }
+            break;
+
+        case GL_TEXTURE_BORDER_COLOR:
+            if (!context->getExtensions().textureBorderClampOES &&
+                context->getClientVersion() < ES_3_2)
+            {
+                context->validationError(entryPoint, GL_INVALID_ENUM, kExtensionNotEnabled);
+                return false;
+            }
+            break;
+
+        default:
+            context->validationErrorF(entryPoint, GL_INVALID_ENUM, kEnumNotSupported, pname);
+            return false;
+    }
+
+    if (length)
+    {
+        *length = GetSamplerParameterCount(pname);
+    }
+    return true;
+}
+
+bool ValidateGetInternalFormativBase(const Context *context,
+                                     angle::EntryPoint entryPoint,
+                                     GLenum target,
+                                     GLenum internalformat,
+                                     GLenum pname,
+                                     GLsizei bufSize,
+                                     GLsizei *numParams)
+{
+    if (numParams)
+    {
+        *numParams = 0;
+    }
+
+    if (context->getClientMajorVersion() < 3)
+    {
+        context->validationError(entryPoint, GL_INVALID_OPERATION, kES3Required);
+        return false;
+    }
+
+    const TextureCaps &formatCaps = context->getTextureCaps().get(internalformat);
+    if (!formatCaps.renderbuffer)
+    {
+        context->validationError(entryPoint, GL_INVALID_ENUM, kFormatNotRenderable);
+        return false;
+    }
+
+    switch (target)
+    {
+        case GL_RENDERBUFFER:
+            break;
+
+        case GL_TEXTURE_2D_MULTISAMPLE:
+            if (context->getClientVersion() < ES_3_1 &&
+                !context->getExtensions().textureMultisampleANGLE)
+            {
+                context->validationError(entryPoint, GL_INVALID_ENUM,
+                                         kMultisampleTextureExtensionOrES31Required);
+                return false;
+            }
+            break;
+        case GL_TEXTURE_2D_MULTISAMPLE_ARRAY_OES:
+            if (!context->getExtensions().textureStorageMultisample2dArrayOES)
+            {
+                context->validationError(entryPoint, GL_INVALID_ENUM,
+                                         kMultisampleArrayExtensionRequired);
+                return false;
+            }
+            break;
+        default:
+            context->validationError(entryPoint, GL_INVALID_ENUM, kInvalidTarget);
+            return false;
+    }
+
+    if (bufSize < 0)
+    {
+        context->validationError(entryPoint, GL_INVALID_VALUE, kInsufficientBufferSize);
+        return false;
+    }
+
+    GLsizei maxWriteParams = 0;
+    switch (pname)
+    {
+        case GL_NUM_SAMPLE_COUNTS:
+            maxWriteParams = 1;
+            break;
+
+        case GL_SAMPLES:
+            maxWriteParams = static_cast<GLsizei>(formatCaps.sampleCounts.size());
+            break;
+
+        default:
+            context->validationErrorF(entryPoint, GL_INVALID_ENUM, kEnumNotSupported, pname);
+            return false;
+    }
+
+    if (numParams)
+    {
+        // glGetInternalFormativ will not overflow bufSize
+        *numParams = std::min(bufSize, maxWriteParams);
+    }
+
+    return true;
+}
+
+bool ValidateFramebufferNotMultisampled(const Context *context,
+                                        angle::EntryPoint entryPoint,
+                                        const Framebuffer *framebuffer,
+                                        bool checkReadBufferResourceSamples)
+{
+    int samples = checkReadBufferResourceSamples
+                      ? framebuffer->getReadBufferResourceSamples(context)
+                      : framebuffer->getSamples(context);
+    if (samples != 0)
+    {
+        context->validationError(entryPoint, GL_INVALID_OPERATION,
+                                 kInvalidMultisampledFramebufferOperation);
+        return false;
+    }
+    return true;
+}
+
+bool ValidateMultitextureUnit(const Context *context, angle::EntryPoint entryPoint, GLenum texture)
+{
+    if (texture < GL_TEXTURE0 || texture >= GL_TEXTURE0 + context->getCaps().maxMultitextureUnits)
+    {
+        context->validationError(entryPoint, GL_INVALID_ENUM, kInvalidMultitextureUnit);
+        return false;
+    }
+    return true;
+}
+
+bool ValidateTexStorageMultisample(const Context *context,
+                                   angle::EntryPoint entryPoint,
+                                   TextureType target,
+                                   GLsizei samples,
+                                   GLint internalFormat,
+                                   GLsizei width,
+                                   GLsizei height)
+{
+    const Caps &caps = context->getCaps();
+    if (width > caps.max2DTextureSize || height > caps.max2DTextureSize)
+    {
+        context->validationError(entryPoint, GL_INVALID_VALUE, kTextureWidthOrHeightOutOfRange);
+        return false;
+    }
+
+    if (samples == 0)
+    {
+        context->validationError(entryPoint, GL_INVALID_VALUE, kSamplesZero);
+        return false;
+    }
+
+    const TextureCaps &formatCaps = context->getTextureCaps().get(internalFormat);
+    if (!formatCaps.textureAttachment)
+    {
+        context->validationError(entryPoint, GL_INVALID_ENUM, kRenderableInternalFormat);
+        return false;
+    }
+
+    // The ES3.1 spec(section 8.8) states that an INVALID_ENUM error is generated if internalformat
+    // is one of the unsized base internalformats listed in table 8.11.
+    const InternalFormat &formatInfo = GetSizedInternalFormatInfo(internalFormat);
+    if (formatInfo.internalFormat == GL_NONE)
+    {
+        context->validationError(entryPoint, GL_INVALID_ENUM, kUnsizedInternalFormatUnsupported);
+        return false;
+    }
+
+    if (static_cast<GLuint>(samples) > formatCaps.getMaxSamples())
+    {
+        context->validationError(entryPoint, GL_INVALID_OPERATION, kSamplesOutOfRange);
+        return false;
+    }
+
+    Texture *texture = context->getTextureByType(target);
+    if (!texture || texture->id().value == 0)
+    {
+        context->validationError(entryPoint, GL_INVALID_OPERATION, kZeroBoundToTarget);
+        return false;
+    }
+
+    if (texture->getImmutableFormat())
+    {
+        context->validationError(entryPoint, GL_INVALID_OPERATION, kImmutableTextureBound);
+        return false;
+    }
+    return true;
+}
+
+bool ValidateTexStorage2DMultisampleBase(const Context *context,
+                                         angle::EntryPoint entryPoint,
+                                         TextureType target,
+                                         GLsizei samples,
+                                         GLint internalFormat,
+                                         GLsizei width,
+                                         GLsizei height)
+{
+    if (target != TextureType::_2DMultisample)
+    {
+        context->validationError(entryPoint, GL_INVALID_ENUM, kInvalidTarget);
+        return false;
+    }
+
+    if (width < 1 || height < 1)
+    {
+        context->validationError(entryPoint, GL_INVALID_VALUE, kTextureSizeTooSmall);
+        return false;
+    }
+
+    return ValidateTexStorageMultisample(context, entryPoint, target, samples, internalFormat,
+                                         width, height);
+}
+
+bool ValidateGetTexLevelParameterBase(const Context *context,
+                                      angle::EntryPoint entryPoint,
+                                      TextureTarget target,
+                                      GLint level,
+                                      GLenum pname,
+                                      GLsizei *length)
+{
+
+    if (length)
+    {
+        *length = 0;
+    }
+
+    TextureType type = TextureTargetToType(target);
+
+    if (!ValidTexLevelDestinationTarget(context, type))
+    {
+        context->validationError(entryPoint, GL_INVALID_ENUM, kInvalidTextureTarget);
+        return false;
+    }
+
+    if (context->getTextureByType(type) == nullptr)
+    {
+        context->validationError(entryPoint, GL_INVALID_ENUM, kTextureNotBound);
+        return false;
+    }
+
+    if (!ValidMipLevel(context, type, level))
+    {
+        context->validationError(entryPoint, GL_INVALID_VALUE, kInvalidMipLevel);
+        return false;
+    }
+
+    switch (pname)
+    {
+        case GL_TEXTURE_RED_TYPE:
+        case GL_TEXTURE_GREEN_TYPE:
+        case GL_TEXTURE_BLUE_TYPE:
+        case GL_TEXTURE_ALPHA_TYPE:
+        case GL_TEXTURE_DEPTH_TYPE:
+        case GL_TEXTURE_RED_SIZE:
+        case GL_TEXTURE_GREEN_SIZE:
+        case GL_TEXTURE_BLUE_SIZE:
+        case GL_TEXTURE_ALPHA_SIZE:
+        case GL_TEXTURE_DEPTH_SIZE:
+        case GL_TEXTURE_STENCIL_SIZE:
+        case GL_TEXTURE_SHARED_SIZE:
+        case GL_TEXTURE_INTERNAL_FORMAT:
+        case GL_TEXTURE_WIDTH:
+        case GL_TEXTURE_HEIGHT:
+        case GL_TEXTURE_DEPTH:
+        case GL_TEXTURE_SAMPLES:
+        case GL_TEXTURE_FIXED_SAMPLE_LOCATIONS:
+        case GL_TEXTURE_COMPRESSED:
+            break;
+
+        case GL_RESOURCE_INITIALIZED_ANGLE:
+            if (!context->getExtensions().robustResourceInitializationANGLE)
+            {
+                context->validationError(entryPoint, GL_INVALID_ENUM,
+                                         kRobustResourceInitializationExtensionRequired);
+                return false;
+            }
+            break;
+
+        case GL_TEXTURE_BUFFER_DATA_STORE_BINDING:
+        case GL_TEXTURE_BUFFER_OFFSET:
+        case GL_TEXTURE_BUFFER_SIZE:
+            if (context->getClientVersion() < Version(3, 2) &&
+                !context->getExtensions().textureBufferAny())
+            {
+                context->validationError(entryPoint, GL_INVALID_ENUM,
+                                         kTextureBufferExtensionNotAvailable);
+                return false;
+            }
+            break;
+
+        default:
+            context->validationError(entryPoint, GL_INVALID_ENUM, kInvalidPname);
+            return false;
+    }
+
+    if (length)
+    {
+        *length = 1;
+    }
+    return true;
+}
+
+bool ValidateGetMultisamplefvBase(const Context *context,
+                                  angle::EntryPoint entryPoint,
+                                  GLenum pname,
+                                  GLuint index,
+                                  const GLfloat *val)
+{
+    if (pname != GL_SAMPLE_POSITION)
+    {
+        context->validationError(entryPoint, GL_INVALID_ENUM, kInvalidPname);
+        return false;
+    }
+
+    Framebuffer *framebuffer = context->getState().getDrawFramebuffer();
+    GLint samples            = framebuffer->getSamples(context);
+
+    if (index >= static_cast<GLuint>(samples))
+    {
+        context->validationError(entryPoint, GL_INVALID_VALUE, kIndexExceedsSamples);
+        return false;
+    }
+
+    return true;
+}
+
+bool ValidateSampleMaskiBase(const Context *context,
+                             angle::EntryPoint entryPoint,
+                             GLuint maskNumber,
+                             GLbitfield mask)
+{
+    if (maskNumber >= static_cast<GLuint>(context->getCaps().maxSampleMaskWords))
+    {
+        context->validationError(entryPoint, GL_INVALID_VALUE, kInvalidSampleMaskNumber);
+        return false;
+    }
+
+    return true;
+}
+
+void RecordDrawAttribsError(const Context *context, angle::EntryPoint entryPoint)
+{
+    // An overflow can happen when adding the offset. Check against a special constant.
+    if (context->getStateCache().getNonInstancedVertexElementLimit() ==
+            VertexAttribute::kIntegerOverflow ||
+        context->getStateCache().getInstancedVertexElementLimit() ==
+            VertexAttribute::kIntegerOverflow)
+    {
+        context->validationError(entryPoint, GL_INVALID_OPERATION, kIntegerOverflow);
+    }
+    else
+    {
+        // [OpenGL ES 3.0.2] section 2.9.4 page 40:
+        // We can return INVALID_OPERATION if our buffer does not have enough backing data.
+        context->validationError(entryPoint, GL_INVALID_OPERATION, kInsufficientVertexBufferSize);
+    }
+}
+
+bool ValidateLoseContextCHROMIUM(const Context *context,
+                                 angle::EntryPoint entryPoint,
+                                 GraphicsResetStatus current,
+                                 GraphicsResetStatus other)
+{
+    if (!context->getExtensions().loseContextCHROMIUM)
+    {
+        context->validationError(entryPoint, GL_INVALID_OPERATION, kExtensionNotEnabled);
+        return false;
+    }
+
+    switch (current)
+    {
+        case GraphicsResetStatus::GuiltyContextReset:
+        case GraphicsResetStatus::InnocentContextReset:
+        case GraphicsResetStatus::UnknownContextReset:
+            break;
+
+        default:
+            context->validationError(entryPoint, GL_INVALID_ENUM, kInvalidResetStatus);
+    }
+
+    switch (other)
+    {
+        case GraphicsResetStatus::GuiltyContextReset:
+        case GraphicsResetStatus::InnocentContextReset:
+        case GraphicsResetStatus::UnknownContextReset:
+            break;
+
+        default:
+            context->validationError(entryPoint, GL_INVALID_ENUM, kInvalidResetStatus);
+    }
+
+    return true;
+}
+
+// GL_ANGLE_texture_storage_external
+bool ValidateTexImage2DExternalANGLE(const Context *context,
+                                     angle::EntryPoint entryPoint,
+                                     TextureTarget target,
+                                     GLint level,
+                                     GLint internalformat,
+                                     GLsizei width,
+                                     GLsizei height,
+                                     GLint border,
+                                     GLenum format,
+                                     GLenum type)
+{
+    if (!context->getExtensions().textureExternalUpdateANGLE)
+    {
+        context->validationError(entryPoint, GL_INVALID_OPERATION, kExtensionNotEnabled);
+        return false;
+    }
+
+    if (!ValidTexture2DDestinationTarget(context, target) &&
+        !ValidTextureExternalTarget(context, target))
+    {
+        context->validationError(entryPoint, GL_INVALID_ENUM, kInvalidTextureTarget);
+        return false;
+    }
+
+    if (context->getClientMajorVersion() <= 2)
+    {
+        if (!ValidateES2TexImageParametersBase(context, entryPoint, target, level, internalformat,
+                                               false, false, 0, 0, width, height, border, format,
+                                               type, -1, nullptr))
+        {
+            return false;
+        }
+    }
+    else
+    {
+        if (!ValidateES3TexImageParametersBase(context, entryPoint, target, level, internalformat,
+                                               false, false, 0, 0, 0, width, height, 1, border,
+                                               format, type, -1, nullptr))
+        {
+            return false;
+        }
+    }
+
+    return true;
+}
+
+bool ValidateInvalidateTextureANGLE(const Context *context,
+                                    angle::EntryPoint entryPoint,
+                                    TextureType target)
+{
+    if (!context->getExtensions().textureExternalUpdateANGLE)
+    {
+        context->validationError(entryPoint, GL_INVALID_OPERATION, kExtensionNotEnabled);
+        return false;
+    }
+
+    if (!ValidTextureTarget(context, target) && !ValidTextureExternalTarget(context, target))
+    {
+        context->validationError(entryPoint, GL_INVALID_ENUM, kInvalidTextureTarget);
+        return false;
+    }
+
+    return true;
+}
+
+bool ValidateProgramExecutableXFBBuffersPresent(const Context *context,
+                                                const ProgramExecutable *programExecutable)
+{
+    size_t programXfbCount = programExecutable->getTransformFeedbackBufferCount();
+    const TransformFeedback *transformFeedback = context->getState().getCurrentTransformFeedback();
+    for (size_t programXfbIndex = 0; programXfbIndex < programXfbCount; ++programXfbIndex)
+    {
+        const OffsetBindingPointer<Buffer> &buffer =
+            transformFeedback->getIndexedBuffer(programXfbIndex);
+        if (!buffer.get())
+        {
+            return false;
+        }
+    }
+
+    return true;
+}
+
+bool ValidateLogicOpCommon(const Context *context,
+                           angle::EntryPoint entryPoint,
+                           LogicalOperation opcodePacked)
+{
+    switch (opcodePacked)
+    {
+        case LogicalOperation::And:
+        case LogicalOperation::AndInverted:
+        case LogicalOperation::AndReverse:
+        case LogicalOperation::Clear:
+        case LogicalOperation::Copy:
+        case LogicalOperation::CopyInverted:
+        case LogicalOperation::Equiv:
+        case LogicalOperation::Invert:
+        case LogicalOperation::Nand:
+        case LogicalOperation::Noop:
+        case LogicalOperation::Nor:
+        case LogicalOperation::Or:
+        case LogicalOperation::OrInverted:
+        case LogicalOperation::OrReverse:
+        case LogicalOperation::Set:
+        case LogicalOperation::Xor:
+            return true;
+        default:
+            context->validationError(entryPoint, GL_INVALID_ENUM, kInvalidLogicOp);
+            return false;
+    }
+}
+}  // namespace gl