Adding upstream version 115.7.0esr.upstream/115.7.0esrupstream

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

1 files changed, 1213 insertions, 0 deletions

diff --git a/dom/canvas/WebGLProgram.cpp b/dom/canvas/WebGLProgram.cpp
new file mode 100644
index 0000000000..f29d3d1c14
--- /dev/null
+++ b/dom/canvas/WebGLProgram.cpp
@@ -0,0 +1,1213 @@
+/* -*- Mode: C++; tab-width: 20; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "WebGLProgram.h"
+
+#include "GLContext.h"
+#include "mozilla/CheckedInt.h"
+#include "mozilla/dom/WebGL2RenderingContextBinding.h"
+#include "mozilla/dom/WebGLRenderingContextBinding.h"
+#include "mozilla/gfx/Logging.h"
+#include "mozilla/RefPtr.h"
+#include "nsPrintfCString.h"
+#include "WebGLBuffer.h"
+#include "WebGLContext.h"
+#include "WebGLShader.h"
+#include "WebGLShaderValidator.h"
+#include "WebGLTransformFeedback.h"
+#include "WebGLValidateStrings.h"
+#include "WebGLVertexArray.h"
+
+namespace mozilla {
+
+static bool IsShadowSampler(const GLenum elemType) {
+  switch (elemType) {
+    case LOCAL_GL_SAMPLER_2D_SHADOW:
+    case LOCAL_GL_SAMPLER_CUBE_SHADOW:
+    case LOCAL_GL_SAMPLER_2D_ARRAY_SHADOW:
+      return true;
+    default:
+      return false;
+  }
+}
+
+static Maybe<webgl::TextureBaseType> SamplerBaseType(const GLenum elemType) {
+  switch (elemType) {
+    case LOCAL_GL_SAMPLER_2D:
+    case LOCAL_GL_SAMPLER_3D:
+    case LOCAL_GL_SAMPLER_CUBE:
+    case LOCAL_GL_SAMPLER_2D_ARRAY:
+    case LOCAL_GL_SAMPLER_2D_SHADOW:
+    case LOCAL_GL_SAMPLER_CUBE_SHADOW:
+    case LOCAL_GL_SAMPLER_2D_ARRAY_SHADOW:
+      return Some(webgl::TextureBaseType::Float);
+
+    case LOCAL_GL_INT_SAMPLER_2D:
+    case LOCAL_GL_INT_SAMPLER_3D:
+    case LOCAL_GL_INT_SAMPLER_CUBE:
+    case LOCAL_GL_INT_SAMPLER_2D_ARRAY:
+      return Some(webgl::TextureBaseType::Int);
+
+    case LOCAL_GL_UNSIGNED_INT_SAMPLER_2D:
+    case LOCAL_GL_UNSIGNED_INT_SAMPLER_3D:
+    case LOCAL_GL_UNSIGNED_INT_SAMPLER_CUBE:
+    case LOCAL_GL_UNSIGNED_INT_SAMPLER_2D_ARRAY:
+      return Some(webgl::TextureBaseType::UInt);
+
+    default:
+      return {};
+  }
+}
+
+//////////
+
+static webgl::TextureBaseType FragOutputBaseType(const GLenum type) {
+  switch (type) {
+    case LOCAL_GL_FLOAT:
+    case LOCAL_GL_FLOAT_VEC2:
+    case LOCAL_GL_FLOAT_VEC3:
+    case LOCAL_GL_FLOAT_VEC4:
+      return webgl::TextureBaseType::Float;
+
+    case LOCAL_GL_INT:
+    case LOCAL_GL_INT_VEC2:
+    case LOCAL_GL_INT_VEC3:
+    case LOCAL_GL_INT_VEC4:
+      return webgl::TextureBaseType::Int;
+
+    case LOCAL_GL_UNSIGNED_INT:
+    case LOCAL_GL_UNSIGNED_INT_VEC2:
+    case LOCAL_GL_UNSIGNED_INT_VEC3:
+    case LOCAL_GL_UNSIGNED_INT_VEC4:
+      return webgl::TextureBaseType::UInt;
+
+    default:
+      break;
+  }
+
+  const auto& str = EnumString(type);
+  gfxCriticalError() << "Unhandled enum for FragOutputBaseType: "
+                     << str.c_str();
+  return webgl::TextureBaseType::Float;
+}
+
+// -----------------------------------------
+
+namespace webgl {
+
+void UniformAs1fv(gl::GLContext& gl, GLint location, GLsizei count,
+                  bool transpose, const void* any) {
+  gl.fUniform1fv(location, count, static_cast<const float*>(any));
+}
+void UniformAs2fv(gl::GLContext& gl, GLint location, GLsizei count,
+                  bool transpose, const void* any) {
+  gl.fUniform2fv(location, count, static_cast<const float*>(any));
+}
+void UniformAs3fv(gl::GLContext& gl, GLint location, GLsizei count,
+                  bool transpose, const void* any) {
+  gl.fUniform3fv(location, count, static_cast<const float*>(any));
+}
+void UniformAs4fv(gl::GLContext& gl, GLint location, GLsizei count,
+                  bool transpose, const void* any) {
+  gl.fUniform4fv(location, count, static_cast<const float*>(any));
+}
+
+void UniformAs1iv(gl::GLContext& gl, GLint location, GLsizei count,
+                  bool transpose, const void* any) {
+  gl.fUniform1iv(location, count, static_cast<const int32_t*>(any));
+}
+void UniformAs2iv(gl::GLContext& gl, GLint location, GLsizei count,
+                  bool transpose, const void* any) {
+  gl.fUniform2iv(location, count, static_cast<const int32_t*>(any));
+}
+void UniformAs3iv(gl::GLContext& gl, GLint location, GLsizei count,
+                  bool transpose, const void* any) {
+  gl.fUniform3iv(location, count, static_cast<const int32_t*>(any));
+}
+void UniformAs4iv(gl::GLContext& gl, GLint location, GLsizei count,
+                  bool transpose, const void* any) {
+  gl.fUniform4iv(location, count, static_cast<const int32_t*>(any));
+}
+
+void UniformAs1uiv(gl::GLContext& gl, GLint location, GLsizei count,
+                   bool transpose, const void* any) {
+  gl.fUniform1uiv(location, count, static_cast<const uint32_t*>(any));
+}
+void UniformAs2uiv(gl::GLContext& gl, GLint location, GLsizei count,
+                   bool transpose, const void* any) {
+  gl.fUniform2uiv(location, count, static_cast<const uint32_t*>(any));
+}
+void UniformAs3uiv(gl::GLContext& gl, GLint location, GLsizei count,
+                   bool transpose, const void* any) {
+  gl.fUniform3uiv(location, count, static_cast<const uint32_t*>(any));
+}
+void UniformAs4uiv(gl::GLContext& gl, GLint location, GLsizei count,
+                   bool transpose, const void* any) {
+  gl.fUniform4uiv(location, count, static_cast<const uint32_t*>(any));
+}
+
+void UniformAsMatrix2x2fv(gl::GLContext& gl, GLint location, GLsizei count,
+                          bool transpose, const void* any) {
+  gl.fUniformMatrix2fv(location, count, transpose,
+                       static_cast<const float*>(any));
+}
+void UniformAsMatrix2x3fv(gl::GLContext& gl, GLint location, GLsizei count,
+                          bool transpose, const void* any) {
+  gl.fUniformMatrix2x3fv(location, count, transpose,
+                         static_cast<const float*>(any));
+}
+void UniformAsMatrix2x4fv(gl::GLContext& gl, GLint location, GLsizei count,
+                          bool transpose, const void* any) {
+  gl.fUniformMatrix2x4fv(location, count, transpose,
+                         static_cast<const float*>(any));
+}
+
+void UniformAsMatrix3x2fv(gl::GLContext& gl, GLint location, GLsizei count,
+                          bool transpose, const void* any) {
+  gl.fUniformMatrix3x2fv(location, count, transpose,
+                         static_cast<const float*>(any));
+}
+void UniformAsMatrix3x3fv(gl::GLContext& gl, GLint location, GLsizei count,
+                          bool transpose, const void* any) {
+  gl.fUniformMatrix3fv(location, count, transpose,
+                       static_cast<const float*>(any));
+}
+void UniformAsMatrix3x4fv(gl::GLContext& gl, GLint location, GLsizei count,
+                          bool transpose, const void* any) {
+  gl.fUniformMatrix3x4fv(location, count, transpose,
+                         static_cast<const float*>(any));
+}
+
+void UniformAsMatrix4x2fv(gl::GLContext& gl, GLint location, GLsizei count,
+                          bool transpose, const void* any) {
+  gl.fUniformMatrix4x2fv(location, count, transpose,
+                         static_cast<const float*>(any));
+}
+void UniformAsMatrix4x3fv(gl::GLContext& gl, GLint location, GLsizei count,
+                          bool transpose, const void* any) {
+  gl.fUniformMatrix4x3fv(location, count, transpose,
+                         static_cast<const float*>(any));
+}
+void UniformAsMatrix4x4fv(gl::GLContext& gl, GLint location, GLsizei count,
+                          bool transpose, const void* any) {
+  gl.fUniformMatrix4fv(location, count, transpose,
+                       static_cast<const float*>(any));
+}
+
+// -
+
+static bool EndsWith(const std::string& str, const std::string& needle) {
+  if (str.length() < needle.length()) return false;
+  return str.compare(str.length() - needle.length(), needle.length(), needle) ==
+         0;
+}
+
+webgl::ActiveUniformValidationInfo webgl::ActiveUniformValidationInfo::Make(
+    const webgl::ActiveUniformInfo& info) {
+  auto ret = webgl::ActiveUniformValidationInfo{info};
+  ret.isArray = EndsWith(info.name, "[0]");
+
+  switch (info.elemType) {
+    case LOCAL_GL_FLOAT:
+      ret.channelsPerElem = 1;
+      ret.pfn = &UniformAs1fv;
+      break;
+    case LOCAL_GL_FLOAT_VEC2:
+      ret.channelsPerElem = 2;
+      ret.pfn = &UniformAs2fv;
+      break;
+    case LOCAL_GL_FLOAT_VEC3:
+      ret.channelsPerElem = 3;
+      ret.pfn = &UniformAs3fv;
+      break;
+    case LOCAL_GL_FLOAT_VEC4:
+      ret.channelsPerElem = 4;
+      ret.pfn = &UniformAs4fv;
+      break;
+
+    case LOCAL_GL_SAMPLER_2D:
+    case LOCAL_GL_SAMPLER_3D:
+    case LOCAL_GL_SAMPLER_CUBE:
+    case LOCAL_GL_SAMPLER_2D_SHADOW:
+    case LOCAL_GL_SAMPLER_2D_ARRAY:
+    case LOCAL_GL_SAMPLER_2D_ARRAY_SHADOW:
+    case LOCAL_GL_SAMPLER_CUBE_SHADOW:
+    case LOCAL_GL_INT_SAMPLER_2D:
+    case LOCAL_GL_INT_SAMPLER_3D:
+    case LOCAL_GL_INT_SAMPLER_CUBE:
+    case LOCAL_GL_INT_SAMPLER_2D_ARRAY:
+    case LOCAL_GL_UNSIGNED_INT_SAMPLER_2D:
+    case LOCAL_GL_UNSIGNED_INT_SAMPLER_3D:
+    case LOCAL_GL_UNSIGNED_INT_SAMPLER_CUBE:
+    case LOCAL_GL_UNSIGNED_INT_SAMPLER_2D_ARRAY:
+    case LOCAL_GL_BOOL:
+    case LOCAL_GL_INT:
+      ret.channelsPerElem = 1;
+      ret.pfn = &UniformAs1iv;
+      break;
+    case LOCAL_GL_BOOL_VEC2:
+    case LOCAL_GL_INT_VEC2:
+      ret.channelsPerElem = 2;
+      ret.pfn = &UniformAs2iv;
+      break;
+    case LOCAL_GL_BOOL_VEC3:
+    case LOCAL_GL_INT_VEC3:
+      ret.channelsPerElem = 3;
+      ret.pfn = &UniformAs3iv;
+      break;
+    case LOCAL_GL_BOOL_VEC4:
+    case LOCAL_GL_INT_VEC4:
+      ret.channelsPerElem = 4;
+      ret.pfn = &UniformAs4iv;
+      break;
+
+    case LOCAL_GL_UNSIGNED_INT:
+      ret.channelsPerElem = 1;
+      ret.pfn = &UniformAs1uiv;
+      break;
+    case LOCAL_GL_UNSIGNED_INT_VEC2:
+      ret.channelsPerElem = 2;
+      ret.pfn = &UniformAs2uiv;
+      break;
+    case LOCAL_GL_UNSIGNED_INT_VEC3:
+      ret.channelsPerElem = 3;
+      ret.pfn = &UniformAs3uiv;
+      break;
+    case LOCAL_GL_UNSIGNED_INT_VEC4:
+      ret.channelsPerElem = 4;
+      ret.pfn = &UniformAs4uiv;
+      break;
+
+      // -
+
+    case LOCAL_GL_FLOAT_MAT2:
+      ret.channelsPerElem = 2 * 2;
+      ret.pfn = &UniformAsMatrix2x2fv;
+      break;
+    case LOCAL_GL_FLOAT_MAT2x3:
+      ret.channelsPerElem = 2 * 3;
+      ret.pfn = &UniformAsMatrix2x3fv;
+      break;
+    case LOCAL_GL_FLOAT_MAT2x4:
+      ret.channelsPerElem = 2 * 4;
+      ret.pfn = &UniformAsMatrix2x4fv;
+      break;
+
+    case LOCAL_GL_FLOAT_MAT3x2:
+      ret.channelsPerElem = 3 * 2;
+      ret.pfn = &UniformAsMatrix3x2fv;
+      break;
+    case LOCAL_GL_FLOAT_MAT3:
+      ret.channelsPerElem = 3 * 3;
+      ret.pfn = &UniformAsMatrix3x3fv;
+      break;
+    case LOCAL_GL_FLOAT_MAT3x4:
+      ret.channelsPerElem = 3 * 4;
+      ret.pfn = &UniformAsMatrix3x4fv;
+      break;
+
+    case LOCAL_GL_FLOAT_MAT4x2:
+      ret.channelsPerElem = 4 * 2;
+      ret.pfn = &UniformAsMatrix4x2fv;
+      break;
+    case LOCAL_GL_FLOAT_MAT4x3:
+      ret.channelsPerElem = 4 * 3;
+      ret.pfn = &UniformAsMatrix4x3fv;
+      break;
+    case LOCAL_GL_FLOAT_MAT4:
+      ret.channelsPerElem = 4 * 4;
+      ret.pfn = &UniformAsMatrix4x4fv;
+      break;
+
+    default:
+      gfxCriticalError() << "Bad `elemType`: " << EnumString(info.elemType);
+      MOZ_CRASH("`elemType`");
+  }
+  return ret;
+}
+
+}  // namespace webgl
+
+// -------------------------
+
+// #define DUMP_SHADERVAR_MAPPINGS
+
+RefPtr<const webgl::LinkedProgramInfo> QueryProgramInfo(WebGLProgram* prog,
+                                                        gl::GLContext* gl) {
+  WebGLContext* const webgl = prog->mContext;
+
+  RefPtr<webgl::LinkedProgramInfo> info(new webgl::LinkedProgramInfo(prog));
+
+  // Frag outputs
+
+  {
+    const auto& fragShader = prog->FragShader();
+    const auto& compileResults = fragShader->CompileResults();
+    const auto version = compileResults->mShaderVersion;
+
+    const auto fnAddInfo = [&](const webgl::FragOutputInfo& x) {
+      info->hasOutput[x.loc] = true;
+      info->fragOutputs.insert({x.loc, x});
+    };
+
+    if (version == 300) {
+      for (const auto& cur : compileResults->mOutputVariables) {
+        auto loc = cur.location;
+        if (loc == -1) loc = 0;
+
+        const auto info =
+            webgl::FragOutputInfo{uint8_t(loc), cur.name, cur.mappedName,
+                                  FragOutputBaseType(cur.type)};
+        if (!cur.isArray()) {
+          fnAddInfo(info);
+          continue;
+        }
+        MOZ_ASSERT(cur.arraySizes.size() == 1);
+        for (uint32_t i = 0; i < cur.arraySizes[0]; ++i) {
+          const auto indexStr = std::string("[") + std::to_string(i) + "]";
+
+          const auto userName = info.userName + indexStr;
+          const auto mappedName = info.mappedName + indexStr;
+
+          const auto indexedInfo = webgl::FragOutputInfo{
+              uint8_t(info.loc + i), userName, mappedName, info.baseType};
+          fnAddInfo(indexedInfo);
+        }
+      }
+    } else {
+      // ANGLE's translator doesn't tell us about non-user frag outputs. :(
+
+      const auto& translatedSource = compileResults->mObjectCode;
+      uint32_t drawBuffers = 1;
+      if (translatedSource.find("(gl_FragData[1]") != std::string::npos ||
+          translatedSource.find("(webgl_FragData[1]") != std::string::npos) {
+        // The matching with the leading '(' prevents cleverly-named user vars
+        // breaking this. Since ANGLE initializes all outputs, if this is an MRT
+        // shader, FragData[1] will be present. FragData[0] is valid for non-MRT
+        // shaders.
+        drawBuffers = webgl->GLMaxDrawBuffers();
+      } else if (translatedSource.find("(gl_FragColor") == std::string::npos &&
+                 translatedSource.find("(webgl_FragColor") ==
+                     std::string::npos &&
+                 translatedSource.find("(gl_FragData") == std::string::npos &&
+                 translatedSource.find("(webgl_FragData") ==
+                     std::string::npos) {
+        // We have to support no-color-output shaders?
+        drawBuffers = 0;
+      }
+
+      for (uint32_t i = 0; i < drawBuffers; ++i) {
+        const auto name = std::string("gl_FragData[") + std::to_string(i) + "]";
+        const auto info = webgl::FragOutputInfo{uint8_t(i), name, name,
+                                                webgl::TextureBaseType::Float};
+        fnAddInfo(info);
+      }
+    }
+  }
+
+  const auto& vertShader = prog->VertShader();
+  const auto& vertCompileResults = vertShader->CompileResults();
+  const auto numViews = vertCompileResults->mVertexShaderNumViews;
+  if (numViews != -1) {
+    info->zLayerCount = AssertedCast<uint8_t>(numViews);
+  }
+
+  // -
+
+  auto& nameMap = info->nameMap;
+
+  const auto fnAccum = [&](WebGLShader& shader) {
+    const auto& compRes = shader.CompileResults();
+    for (const auto& pair : compRes->mNameMap) {
+      nameMap.insert(pair);
+    }
+  };
+  fnAccum(*prog->VertShader());
+  fnAccum(*prog->FragShader());
+
+  // -
+
+  std::unordered_map<std::string, std::string> nameUnmap;
+  for (const auto& pair : nameMap) {
+    nameUnmap.insert({pair.second, pair.first});
+  }
+
+  info->active =
+      GetLinkActiveInfo(*gl, prog->mGLName, webgl->IsWebGL2(), nameUnmap);
+
+  // -
+
+  for (const auto& attrib : info->active.activeAttribs) {
+    if (attrib.location == 0) {
+      info->attrib0Active = true;
+      break;
+    }
+  }
+
+  info->webgl_gl_VertexID_Offset =
+      gl->fGetUniformLocation(prog->mGLName, "webgl_gl_VertexID_Offset");
+
+  // -
+
+  for (const auto& uniform : info->active.activeUniforms) {
+    const auto& elemType = uniform.elemType;
+    webgl::SamplerUniformInfo* samplerInfo = nullptr;
+    const auto baseType = SamplerBaseType(elemType);
+    if (baseType) {
+      const bool isShadowSampler = IsShadowSampler(elemType);
+
+      auto* texList = &webgl->mBound2DTextures;
+
+      switch (elemType) {
+        case LOCAL_GL_SAMPLER_2D:
+        case LOCAL_GL_SAMPLER_2D_SHADOW:
+        case LOCAL_GL_INT_SAMPLER_2D:
+        case LOCAL_GL_UNSIGNED_INT_SAMPLER_2D:
+          break;
+
+        case LOCAL_GL_SAMPLER_CUBE:
+        case LOCAL_GL_SAMPLER_CUBE_SHADOW:
+        case LOCAL_GL_INT_SAMPLER_CUBE:
+        case LOCAL_GL_UNSIGNED_INT_SAMPLER_CUBE:
+          texList = &webgl->mBoundCubeMapTextures;
+          break;
+
+        case LOCAL_GL_SAMPLER_3D:
+        case LOCAL_GL_INT_SAMPLER_3D:
+        case LOCAL_GL_UNSIGNED_INT_SAMPLER_3D:
+          texList = &webgl->mBound3DTextures;
+          break;
+
+        case LOCAL_GL_SAMPLER_2D_ARRAY:
+        case LOCAL_GL_SAMPLER_2D_ARRAY_SHADOW:
+        case LOCAL_GL_INT_SAMPLER_2D_ARRAY:
+        case LOCAL_GL_UNSIGNED_INT_SAMPLER_2D_ARRAY:
+          texList = &webgl->mBound2DArrayTextures;
+          break;
+      }
+
+      auto curInfo = std::unique_ptr<webgl::SamplerUniformInfo>(
+          new webgl::SamplerUniformInfo{*texList, *baseType, isShadowSampler});
+      MOZ_RELEASE_ASSERT(curInfo->texUnits.resize(uniform.elemCount));
+      samplerInfo = curInfo.get();
+      info->samplerUniforms.push_back(std::move(curInfo));
+    }
+
+    const auto valInfo = webgl::ActiveUniformValidationInfo::Make(uniform);
+
+    for (const auto& pair : uniform.locByIndex) {
+      info->locationMap.insert(
+          {pair.second, {valInfo, pair.first, samplerInfo}});
+    }
+  }
+
+  // -
+
+  {
+    const auto& activeBlocks = info->active.activeUniformBlocks;
+    info->uniformBlocks.reserve(activeBlocks.size());
+    for (const auto& cur : activeBlocks) {
+      const auto curInfo = webgl::UniformBlockInfo{
+          cur, &webgl->mIndexedUniformBufferBindings[0]};
+      info->uniformBlocks.push_back(curInfo);
+    }
+  }
+
+  return info;
+}
+
+////////////////////////////////////////////////////////////////////////////////
+
+webgl::LinkedProgramInfo::LinkedProgramInfo(WebGLProgram* prog)
+    : prog(prog),
+      transformFeedbackBufferMode(prog->mNextLink_TransformFeedbackBufferMode) {
+}
+
+webgl::LinkedProgramInfo::~LinkedProgramInfo() = default;
+
+webgl::AttribBaseType webgl::ToAttribBaseType(const GLenum elemType) {
+  switch (elemType) {
+    case LOCAL_GL_BOOL:
+    case LOCAL_GL_BOOL_VEC2:
+    case LOCAL_GL_BOOL_VEC3:
+    case LOCAL_GL_BOOL_VEC4:
+      return webgl::AttribBaseType::Boolean;
+
+    case LOCAL_GL_FLOAT:
+    case LOCAL_GL_FLOAT_VEC2:
+    case LOCAL_GL_FLOAT_VEC3:
+    case LOCAL_GL_FLOAT_VEC4:
+    case LOCAL_GL_FLOAT_MAT2:
+    case LOCAL_GL_FLOAT_MAT2x3:
+    case LOCAL_GL_FLOAT_MAT3x2:
+    case LOCAL_GL_FLOAT_MAT2x4:
+    case LOCAL_GL_FLOAT_MAT4x2:
+    case LOCAL_GL_FLOAT_MAT3:
+    case LOCAL_GL_FLOAT_MAT3x4:
+    case LOCAL_GL_FLOAT_MAT4x3:
+    case LOCAL_GL_FLOAT_MAT4:
+      return webgl::AttribBaseType::Float;
+
+    case LOCAL_GL_INT:
+    case LOCAL_GL_INT_VEC2:
+    case LOCAL_GL_INT_VEC3:
+    case LOCAL_GL_INT_VEC4:
+    case LOCAL_GL_SAMPLER_2D:
+    case LOCAL_GL_SAMPLER_3D:
+    case LOCAL_GL_SAMPLER_CUBE:
+    case LOCAL_GL_SAMPLER_2D_SHADOW:
+    case LOCAL_GL_SAMPLER_2D_ARRAY:
+    case LOCAL_GL_SAMPLER_2D_ARRAY_SHADOW:
+    case LOCAL_GL_SAMPLER_CUBE_SHADOW:
+    case LOCAL_GL_INT_SAMPLER_2D:
+    case LOCAL_GL_INT_SAMPLER_3D:
+    case LOCAL_GL_INT_SAMPLER_CUBE:
+    case LOCAL_GL_INT_SAMPLER_2D_ARRAY:
+    case LOCAL_GL_UNSIGNED_INT_SAMPLER_2D:
+    case LOCAL_GL_UNSIGNED_INT_SAMPLER_3D:
+    case LOCAL_GL_UNSIGNED_INT_SAMPLER_CUBE:
+    case LOCAL_GL_UNSIGNED_INT_SAMPLER_2D_ARRAY:
+      return webgl::AttribBaseType::Int;
+
+    case LOCAL_GL_UNSIGNED_INT:
+    case LOCAL_GL_UNSIGNED_INT_VEC2:
+    case LOCAL_GL_UNSIGNED_INT_VEC3:
+    case LOCAL_GL_UNSIGNED_INT_VEC4:
+      return webgl::AttribBaseType::Uint;
+
+    default:
+      gfxCriticalError() << "Bad `elemType`: " << EnumString(elemType);
+      MOZ_CRASH("`elemType`");
+  }
+}
+
+const char* webgl::ToString(const webgl::AttribBaseType x) {
+  switch (x) {
+    case webgl::AttribBaseType::Float:
+      return "FLOAT";
+    case webgl::AttribBaseType::Int:
+      return "INT";
+    case webgl::AttribBaseType::Uint:
+      return "UINT";
+    case webgl::AttribBaseType::Boolean:
+      return "BOOL";
+  }
+  MOZ_CRASH("pacify gcc6 warning");
+}
+
+const char* webgl::ToString(const webgl::UniformBaseType x) {
+  switch (x) {
+    case webgl::UniformBaseType::Float:
+      return "FLOAT";
+    case webgl::UniformBaseType::Int:
+      return "INT";
+    case webgl::UniformBaseType::Uint:
+      return "UINT";
+  }
+  MOZ_CRASH("pacify gcc6 warning");
+}
+
+const webgl::CachedDrawFetchLimits*
+webgl::LinkedProgramInfo::GetDrawFetchLimits() const {
+  const auto& webgl = prog->mContext;
+  const auto& vao = webgl->mBoundVertexArray;
+
+  {
+    // We have to ensure that every enabled attrib array (not just the active
+    // ones) has a non-null buffer.
+    const auto badIndex = vao->GetAttribIsArrayWithNullBuffer();
+    if (badIndex) {
+      webgl->ErrorInvalidOperation(
+          "Vertex attrib array %u is enabled but"
+          " has no buffer bound.",
+          *badIndex);
+      return nullptr;
+    }
+  }
+
+  const auto& activeAttribs = active.activeAttribs;
+
+  webgl::CachedDrawFetchLimits fetchLimits;
+  fetchLimits.usedBuffers =
+      std::move(mScratchFetchLimits.usedBuffers);  // Avoid realloc.
+  fetchLimits.usedBuffers.clear();
+  fetchLimits.usedBuffers.reserve(activeAttribs.size());
+
+  bool hasActiveAttrib = false;
+  bool hasActiveDivisor0 = false;
+
+  for (const auto& progAttrib : activeAttribs) {
+    const auto& loc = progAttrib.location;
+    if (loc == -1) continue;
+    hasActiveAttrib |= true;
+
+    const auto& binding = vao->AttribBinding(loc);
+    const auto& buffer = binding.buffer;
+    const auto& layout = binding.layout;
+    hasActiveDivisor0 |= (layout.divisor == 0);
+
+    webgl::AttribBaseType attribDataBaseType;
+    if (layout.isArray) {
+      MOZ_ASSERT(buffer);
+      fetchLimits.usedBuffers.push_back(
+          {buffer.get(), static_cast<uint32_t>(loc)});
+
+      attribDataBaseType = layout.baseType;
+
+      const auto availBytes = buffer->ByteLength();
+      const auto availElems = AvailGroups(availBytes, layout.byteOffset,
+                                          layout.byteSize, layout.byteStride);
+      if (layout.divisor) {
+        const auto availInstances =
+            CheckedInt<uint64_t>(availElems) * layout.divisor;
+        if (availInstances.isValid()) {
+          fetchLimits.maxInstances =
+              std::min(fetchLimits.maxInstances, availInstances.value());
+        }  // If not valid, it overflowed too large, so we're super safe.
+      } else {
+        fetchLimits.maxVerts = std::min(fetchLimits.maxVerts, availElems);
+      }
+    } else {
+      attribDataBaseType = webgl->mGenericVertexAttribTypes[loc];
+    }
+
+    const auto& progBaseType = progAttrib.baseType;
+    if ((attribDataBaseType != progBaseType) &&
+        (progBaseType != webgl::AttribBaseType::Boolean)) {
+      const auto& dataType = ToString(attribDataBaseType);
+      const auto& progType = ToString(progBaseType);
+      webgl->ErrorInvalidOperation(
+          "Vertex attrib %u requires data of type %s,"
+          " but is being supplied with type %s.",
+          loc, progType, dataType);
+      return nullptr;
+    }
+  }
+
+  if (!webgl->IsWebGL2() && hasActiveAttrib && !hasActiveDivisor0) {
+    webgl->ErrorInvalidOperation(
+        "One active vertex attrib (if any are active)"
+        " must have a divisor of 0.");
+    return nullptr;
+  }
+
+  // -
+
+  mScratchFetchLimits = std::move(fetchLimits);
+  return &mScratchFetchLimits;
+}
+
+////////////////////////////////////////////////////////////////////////////////
+// WebGLProgram
+
+WebGLProgram::WebGLProgram(WebGLContext* webgl)
+    : WebGLContextBoundObject(webgl),
+      mGLName(webgl->gl->fCreateProgram()),
+      mNumActiveTFOs(0),
+      mNextLink_TransformFeedbackBufferMode(LOCAL_GL_INTERLEAVED_ATTRIBS) {}
+
+WebGLProgram::~WebGLProgram() {
+  mVertShader = nullptr;
+  mFragShader = nullptr;
+
+  mMostRecentLinkInfo = nullptr;
+
+  if (!mContext) return;
+  mContext->gl->fDeleteProgram(mGLName);
+}
+
+////////////////////////////////////////////////////////////////////////////////
+// GL funcs
+
+void WebGLProgram::AttachShader(WebGLShader& shader) {
+  RefPtr<WebGLShader>* shaderSlot = nullptr;
+  switch (shader.mType) {
+    case LOCAL_GL_VERTEX_SHADER:
+      shaderSlot = &mVertShader;
+      break;
+    case LOCAL_GL_FRAGMENT_SHADER:
+      shaderSlot = &mFragShader;
+      break;
+  }
+  MOZ_ASSERT(shaderSlot);
+
+  *shaderSlot = &shader;
+
+  mContext->gl->fAttachShader(mGLName, shader.mGLName);
+}
+
+void WebGLProgram::BindAttribLocation(GLuint loc, const std::string& name) {
+  const auto err = CheckGLSLVariableName(mContext->IsWebGL2(), name);
+  if (err) {
+    mContext->GenerateError(err->type, "%s", err->info.c_str());
+    return;
+  }
+
+  if (loc >= mContext->MaxVertexAttribs()) {
+    mContext->ErrorInvalidValue(
+        "`location` must be less than"
+        " MAX_VERTEX_ATTRIBS.");
+    return;
+  }
+
+  if (name.find("gl_") == 0) {
+    mContext->ErrorInvalidOperation(
+        "Can't set the location of a"
+        " name that starts with 'gl_'.");
+    return;
+  }
+
+  auto res = mNextLink_BoundAttribLocs.insert({name, loc});
+
+  const auto& wasInserted = res.second;
+  if (!wasInserted) {
+    const auto& itr = res.first;
+    itr->second = loc;
+  }
+}
+
+void WebGLProgram::DetachShader(const WebGLShader& shader) {
+  RefPtr<WebGLShader>* shaderSlot = nullptr;
+  switch (shader.mType) {
+    case LOCAL_GL_VERTEX_SHADER:
+      shaderSlot = &mVertShader;
+      break;
+    case LOCAL_GL_FRAGMENT_SHADER:
+      shaderSlot = &mFragShader;
+      break;
+  }
+  MOZ_ASSERT(shaderSlot);
+
+  if (*shaderSlot != &shader) return;
+
+  *shaderSlot = nullptr;
+
+  mContext->gl->fDetachShader(mGLName, shader.mGLName);
+}
+
+void WebGLProgram::UniformBlockBinding(GLuint uniformBlockIndex,
+                                       GLuint uniformBlockBinding) const {
+  if (!IsLinked()) {
+    mContext->ErrorInvalidOperation("`program` must be linked.");
+    return;
+  }
+
+  auto& uniformBlocks = LinkInfo()->uniformBlocks;
+  if (uniformBlockIndex >= uniformBlocks.size()) {
+    mContext->ErrorInvalidValue("Index %u invalid.", uniformBlockIndex);
+    return;
+  }
+  auto& uniformBlock = uniformBlocks[uniformBlockIndex];
+
+  const auto& indexedBindings = mContext->mIndexedUniformBufferBindings;
+  if (uniformBlockBinding >= indexedBindings.size()) {
+    mContext->ErrorInvalidValue("Binding %u invalid.", uniformBlockBinding);
+    return;
+  }
+  const auto& indexedBinding = indexedBindings[uniformBlockBinding];
+
+  ////
+
+  gl::GLContext* gl = mContext->GL();
+  gl->fUniformBlockBinding(mGLName, uniformBlockIndex, uniformBlockBinding);
+
+  ////
+
+  uniformBlock.binding = &indexedBinding;
+}
+
+bool WebGLProgram::ValidateForLink() {
+  const auto AppendCompileLog = [&](const WebGLShader* const shader) {
+    if (!shader) {
+      mLinkLog += " Missing shader.";
+      return;
+    }
+    mLinkLog += "\nSHADER_INFO_LOG:\n";
+    mLinkLog += shader->CompileLog();
+  };
+
+  if (!mVertShader || !mVertShader->IsCompiled()) {
+    mLinkLog = "Must have a compiled vertex shader attached:";
+    AppendCompileLog(mVertShader);
+    return false;
+  }
+  const auto& vertInfo = *mVertShader->CompileResults();
+
+  if (!mFragShader || !mFragShader->IsCompiled()) {
+    mLinkLog = "Must have a compiled fragment shader attached:";
+    AppendCompileLog(mFragShader);
+    return false;
+  }
+  const auto& fragInfo = *mFragShader->CompileResults();
+
+  nsCString errInfo;
+  if (!fragInfo.CanLinkTo(vertInfo, &errInfo)) {
+    mLinkLog = errInfo.BeginReading();
+    return false;
+  }
+
+  const auto& gl = mContext->gl;
+
+  if (gl->WorkAroundDriverBugs() && mContext->mIsMesa) {
+    // Bug 1203135: Mesa crashes internally if we exceed the reported maximum
+    // attribute count.
+    if (mVertShader->NumAttributes() > mContext->MaxVertexAttribs()) {
+      mLinkLog =
+          "Number of attributes exceeds Mesa's reported max"
+          " attribute count.";
+      return false;
+    }
+  }
+
+  return true;
+}
+
+void WebGLProgram::LinkProgram() {
+  if (mNumActiveTFOs) {
+    mContext->ErrorInvalidOperation(
+        "Program is in-use by one or more active"
+        " transform feedback objects.");
+    return;
+  }
+
+  // as some of the validation changes program state
+
+  mLinkLog = {};
+  mMostRecentLinkInfo = nullptr;
+
+  if (!ValidateForLink()) {
+    mContext->GenerateWarning("%s", mLinkLog.c_str());
+    return;
+  }
+
+  // Bind the attrib locations.
+  // This can't be done trivially, because we have to deal with mapped attrib
+  // names.
+  for (const auto& pair : mNextLink_BoundAttribLocs) {
+    const auto& name = pair.first;
+    const auto& index = pair.second;
+
+    mVertShader->BindAttribLocation(mGLName, name, index);
+  }
+
+  // Storage for transform feedback varyings before link.
+  // (Work around for bug seen on nVidia drivers.)
+  std::vector<std::string> scopedMappedTFVaryings;
+
+  if (mContext->IsWebGL2()) {
+    mVertShader->MapTransformFeedbackVaryings(
+        mNextLink_TransformFeedbackVaryings, &scopedMappedTFVaryings);
+
+    std::vector<const char*> driverVaryings;
+    driverVaryings.reserve(scopedMappedTFVaryings.size());
+    for (const auto& cur : scopedMappedTFVaryings) {
+      driverVaryings.push_back(cur.c_str());
+    }
+
+    mContext->gl->fTransformFeedbackVaryings(
+        mGLName, driverVaryings.size(), driverVaryings.data(),
+        mNextLink_TransformFeedbackBufferMode);
+  }
+
+  LinkAndUpdate();
+
+  if (mMostRecentLinkInfo) {
+    std::string postLinkLog;
+    if (ValidateAfterTentativeLink(&postLinkLog)) return;
+
+    mMostRecentLinkInfo = nullptr;
+    mLinkLog = std::move(postLinkLog);
+  }
+
+  // Failed link.
+  if (mContext->ShouldGenerateWarnings()) {
+    // report shader/program infoLogs as warnings.
+    // note that shader compilation errors can be deferred to linkProgram,
+    // which is why we can't do anything in compileShader. In practice we could
+    // report in compileShader the translation errors generated by ANGLE,
+    // but it seems saner to keep a single way of obtaining shader infologs.
+    if (!mLinkLog.empty()) {
+      mContext->GenerateWarning(
+          "Failed to link, leaving the following"
+          " log:\n%s\n",
+          mLinkLog.c_str());
+    }
+  }
+}
+
+static uint8_t NumUsedLocationsByElemType(GLenum elemType) {
+  // GLES 3.0.4 p55
+
+  switch (elemType) {
+    case LOCAL_GL_FLOAT_MAT2:
+    case LOCAL_GL_FLOAT_MAT2x3:
+    case LOCAL_GL_FLOAT_MAT2x4:
+      return 2;
+
+    case LOCAL_GL_FLOAT_MAT3x2:
+    case LOCAL_GL_FLOAT_MAT3:
+    case LOCAL_GL_FLOAT_MAT3x4:
+      return 3;
+
+    case LOCAL_GL_FLOAT_MAT4x2:
+    case LOCAL_GL_FLOAT_MAT4x3:
+    case LOCAL_GL_FLOAT_MAT4:
+      return 4;
+
+    default:
+      return 1;
+  }
+}
+
+uint8_t ElemTypeComponents(const GLenum elemType) {
+  switch (elemType) {
+    case LOCAL_GL_BOOL:
+    case LOCAL_GL_FLOAT:
+    case LOCAL_GL_INT:
+    case LOCAL_GL_UNSIGNED_INT:
+    case LOCAL_GL_SAMPLER_2D:
+    case LOCAL_GL_SAMPLER_3D:
+    case LOCAL_GL_SAMPLER_CUBE:
+    case LOCAL_GL_SAMPLER_2D_SHADOW:
+    case LOCAL_GL_SAMPLER_2D_ARRAY:
+    case LOCAL_GL_SAMPLER_2D_ARRAY_SHADOW:
+    case LOCAL_GL_SAMPLER_CUBE_SHADOW:
+    case LOCAL_GL_INT_SAMPLER_2D:
+    case LOCAL_GL_INT_SAMPLER_3D:
+    case LOCAL_GL_INT_SAMPLER_CUBE:
+    case LOCAL_GL_INT_SAMPLER_2D_ARRAY:
+    case LOCAL_GL_UNSIGNED_INT_SAMPLER_2D:
+    case LOCAL_GL_UNSIGNED_INT_SAMPLER_3D:
+    case LOCAL_GL_UNSIGNED_INT_SAMPLER_CUBE:
+    case LOCAL_GL_UNSIGNED_INT_SAMPLER_2D_ARRAY:
+      return 1;
+
+    case LOCAL_GL_BOOL_VEC2:
+    case LOCAL_GL_FLOAT_VEC2:
+    case LOCAL_GL_INT_VEC2:
+    case LOCAL_GL_UNSIGNED_INT_VEC2:
+      return 2;
+
+    case LOCAL_GL_BOOL_VEC3:
+    case LOCAL_GL_FLOAT_VEC3:
+    case LOCAL_GL_INT_VEC3:
+    case LOCAL_GL_UNSIGNED_INT_VEC3:
+      return 3;
+
+    case LOCAL_GL_BOOL_VEC4:
+    case LOCAL_GL_FLOAT_VEC4:
+    case LOCAL_GL_INT_VEC4:
+    case LOCAL_GL_UNSIGNED_INT_VEC4:
+    case LOCAL_GL_FLOAT_MAT2:
+      return 4;
+
+    case LOCAL_GL_FLOAT_MAT2x3:
+    case LOCAL_GL_FLOAT_MAT3x2:
+      return 2 * 3;
+
+    case LOCAL_GL_FLOAT_MAT2x4:
+    case LOCAL_GL_FLOAT_MAT4x2:
+      return 2 * 4;
+
+    case LOCAL_GL_FLOAT_MAT3:
+      return 3 * 3;
+
+    case LOCAL_GL_FLOAT_MAT3x4:
+    case LOCAL_GL_FLOAT_MAT4x3:
+      return 3 * 4;
+
+    case LOCAL_GL_FLOAT_MAT4:
+      return 4 * 4;
+
+    default:
+      return 0;
+  }
+}
+
+bool WebGLProgram::ValidateAfterTentativeLink(
+    std::string* const out_linkLog) const {
+  const auto& linkInfo = mMostRecentLinkInfo;
+  const auto& gl = mContext->gl;
+
+  // Check for overlapping attrib locations.
+  {
+    std::unordered_map<uint32_t, const std::string&> nameByLoc;
+    for (const auto& attrib : linkInfo->active.activeAttribs) {
+      if (attrib.location == -1) continue;
+
+      const auto& elemType = attrib.elemType;
+      const auto numUsedLocs = NumUsedLocationsByElemType(elemType);
+      for (uint32_t i = 0; i < numUsedLocs; i++) {
+        const uint32_t usedLoc = attrib.location + i;
+
+        const auto res = nameByLoc.insert({usedLoc, attrib.name});
+        const bool& didInsert = res.second;
+        if (!didInsert) {
+          const auto& aliasingName = attrib.name;
+          const auto& itrExisting = res.first;
+          const auto& existingName = itrExisting->second;
+          *out_linkLog = nsPrintfCString(
+                             "Attrib \"%s\" aliases locations used by"
+                             " attrib \"%s\".",
+                             aliasingName.c_str(), existingName.c_str())
+                             .BeginReading();
+          return false;
+        }
+      }
+    }
+  }
+
+  // Forbid too many components for specified buffer mode
+  const auto& activeTfVaryings = linkInfo->active.activeTfVaryings;
+  MOZ_ASSERT(mNextLink_TransformFeedbackVaryings.size() ==
+             activeTfVaryings.size());
+  if (!activeTfVaryings.empty()) {
+    GLuint maxComponentsPerIndex = 0;
+    switch (linkInfo->transformFeedbackBufferMode) {
+      case LOCAL_GL_INTERLEAVED_ATTRIBS:
+        gl->GetUIntegerv(LOCAL_GL_MAX_TRANSFORM_FEEDBACK_INTERLEAVED_COMPONENTS,
+                         &maxComponentsPerIndex);
+        break;
+
+      case LOCAL_GL_SEPARATE_ATTRIBS:
+        gl->GetUIntegerv(LOCAL_GL_MAX_TRANSFORM_FEEDBACK_SEPARATE_COMPONENTS,
+                         &maxComponentsPerIndex);
+        break;
+
+      default:
+        MOZ_CRASH("`bufferMode`");
+    }
+
+    std::vector<size_t> componentsPerVert;
+    for (const auto& cur : activeTfVaryings) {
+      if (componentsPerVert.empty() ||
+          linkInfo->transformFeedbackBufferMode == LOCAL_GL_SEPARATE_ATTRIBS) {
+        componentsPerVert.push_back(0);
+      }
+
+      size_t varyingComponents = ElemTypeComponents(cur.elemType);
+      MOZ_ASSERT(varyingComponents);
+      varyingComponents *= cur.elemCount;
+
+      auto& totalComponentsForIndex = *(componentsPerVert.rbegin());
+      totalComponentsForIndex += varyingComponents;
+
+      if (totalComponentsForIndex > maxComponentsPerIndex) {
+        *out_linkLog = nsPrintfCString(
+                           "Transform feedback varying \"%s\""
+                           " pushed `componentsForIndex` over the"
+                           " limit of %u.",
+                           cur.name.c_str(), maxComponentsPerIndex)
+                           .BeginReading();
+        return false;
+      }
+    }
+
+    linkInfo->componentsPerTFVert = std::move(componentsPerVert);
+  }
+
+  return true;
+}
+
+bool WebGLProgram::UseProgram() const {
+  if (!mMostRecentLinkInfo) {
+    mContext->ErrorInvalidOperation(
+        "Program has not been successfully linked.");
+    return false;
+  }
+
+  if (mContext->mBoundTransformFeedback &&
+      mContext->mBoundTransformFeedback->mIsActive &&
+      !mContext->mBoundTransformFeedback->mIsPaused) {
+    mContext->ErrorInvalidOperation(
+        "Transform feedback active and not paused.");
+    return false;
+  }
+
+  mContext->gl->fUseProgram(mGLName);
+  return true;
+}
+
+bool WebGLProgram::ValidateProgram() const {
+  gl::GLContext* gl = mContext->gl;
+
+#ifdef XP_MACOSX
+  // See bug 593867 for NVIDIA and bug 657201 for ATI. The latter is confirmed
+  // with Mac OS 10.6.7.
+  if (gl->WorkAroundDriverBugs()) {
+    mContext->GenerateWarning(
+        "Implemented as a no-op on"
+        " Mac to work around crashes.");
+    return true;
+  }
+#endif
+
+  gl->fValidateProgram(mGLName);
+  GLint ok = 0;
+  gl->fGetProgramiv(mGLName, LOCAL_GL_VALIDATE_STATUS, &ok);
+  return bool(ok);
+}
+
+////////////////////////////////////////////////////////////////////////////////
+
+void WebGLProgram::LinkAndUpdate() {
+  mMostRecentLinkInfo = nullptr;
+
+  gl::GLContext* gl = mContext->gl;
+  gl->fLinkProgram(mGLName);
+
+  // Grab the program log.
+  {
+    GLuint logLenWithNull = 0;
+    gl->fGetProgramiv(mGLName, LOCAL_GL_INFO_LOG_LENGTH,
+                      (GLint*)&logLenWithNull);
+    if (logLenWithNull > 1) {
+      std::vector<char> buffer(logLenWithNull);
+      gl->fGetProgramInfoLog(mGLName, buffer.size(), nullptr, buffer.data());
+      mLinkLog = buffer.data();
+    } else {
+      mLinkLog.clear();
+    }
+  }
+
+  GLint ok = 0;
+  gl->fGetProgramiv(mGLName, LOCAL_GL_LINK_STATUS, &ok);
+  if (!ok) return;
+
+  mMostRecentLinkInfo =
+      QueryProgramInfo(this, gl);  // Fallible after context loss.
+}
+
+void WebGLProgram::TransformFeedbackVaryings(
+    const std::vector<std::string>& varyings, GLenum bufferMode) {
+  const auto& gl = mContext->gl;
+
+  switch (bufferMode) {
+    case LOCAL_GL_INTERLEAVED_ATTRIBS:
+      break;
+
+    case LOCAL_GL_SEPARATE_ATTRIBS: {
+      GLuint maxAttribs = 0;
+      gl->GetUIntegerv(LOCAL_GL_MAX_TRANSFORM_FEEDBACK_SEPARATE_ATTRIBS,
+                       &maxAttribs);
+      if (varyings.size() > maxAttribs) {
+        mContext->ErrorInvalidValue("Length of `varyings` exceeds %s.",
+                                    "TRANSFORM_FEEDBACK_SEPARATE_ATTRIBS");
+        return;
+      }
+    } break;
+
+    default:
+      mContext->ErrorInvalidEnumInfo("bufferMode", bufferMode);
+      return;
+  }
+
+  ////
+
+  mNextLink_TransformFeedbackVaryings = varyings;
+  mNextLink_TransformFeedbackBufferMode = bufferMode;
+}
+
+}  // namespace mozilla