Adding upstream version 1:115.7.0.upstream/1%115.7.0upstream

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

1 files changed, 642 insertions, 0 deletions

diff --git a/gfx/gl/GLContextFeatures.cpp b/gfx/gl/GLContextFeatures.cpp
new file mode 100644
index 0000000000..b66e6b6bbf
--- /dev/null
+++ b/gfx/gl/GLContextFeatures.cpp
@@ -0,0 +1,642 @@
+/* -*- 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 "GLContext.h"
+#include "nsPrintfCString.h"
+
+namespace mozilla {
+namespace gl {
+
+const size_t kMAX_EXTENSION_GROUP_SIZE = 5;
+
+enum class GLVersion : uint32_t {
+  NONE = 0,  // Feature is not supported natively by GL
+  GL1_2 = 120,
+  GL1_3 = 130,
+  GL2 = 200,
+  GL2_1 = 210,
+  GL3 = 300,
+  GL3_1 = 310,
+  GL3_2 = 320,
+  GL3_3 = 330,
+  GL4 = 400,
+  GL4_1 = 410,
+  GL4_2 = 420,
+  GL4_3 = 430,
+};
+
+enum class GLESVersion : uint32_t {
+  NONE = 0,  // Feature is not support natively by GL ES
+  ES2 = 200,
+  ES3 = 300,
+  ES3_1 = 310,
+  ES3_2 = 320,
+};
+
+// ARB_ES2_compatibility is natively supported in OpenGL 4.1.
+static const GLVersion kGLCoreVersionForES2Compat = GLVersion::GL4_1;
+
+// ARB_ES3_compatibility is natively supported in OpenGL 4.3.
+static const GLVersion kGLCoreVersionForES3Compat = GLVersion::GL4_3;
+
+struct FeatureInfo {
+  const char* mName;
+
+  /* The (desktop) OpenGL version that provides this feature */
+  GLVersion mOpenGLVersion;
+
+  /* The OpenGL ES version that provides this feature */
+  GLESVersion mOpenGLESVersion;
+
+  /* If there is an ARB extension, and its function symbols are
+   * not decorated with an ARB suffix, then its extension ID should go
+   * here, and NOT in mExtensions.  For example, ARB_vertex_array_object
+   * functions do not have an ARB suffix, because it is an extension that
+   * was created to match core GL functionality and will never differ.
+   * Some ARB extensions do have a suffix, if they were created before
+   * a core version of the functionality existed.
+   *
+   * If there is no such ARB extension, pass 0 (GLContext::Extension_None)
+   */
+  GLContext::GLExtensions mARBExtensionWithoutARBSuffix;
+
+  /* Extensions that also provide this feature */
+  GLContext::GLExtensions mExtensions[kMAX_EXTENSION_GROUP_SIZE];
+};
+
+static const FeatureInfo sFeatureInfoArr[] = {
+    {"bind_buffer_offset",
+     GLVersion::NONE,
+     GLESVersion::NONE,
+     GLContext::Extension_None,
+     {
+
+         GLContext::EXT_transform_feedback, GLContext::NV_transform_feedback2,
+         GLContext::Extensions_End}},
+    {"blend_minmax",
+     GLVersion::GL2,
+     GLESVersion::ES3,
+     GLContext::Extension_None,
+     {GLContext::EXT_blend_minmax, GLContext::Extensions_End}},
+    {"clear_buffers",
+     GLVersion::GL3,
+     GLESVersion::ES3,
+     GLContext::Extension_None,
+     {GLContext::Extensions_End}},
+    {"copy_buffer",
+     GLVersion::GL3_1,
+     GLESVersion::ES3,
+     GLContext::ARB_copy_buffer,
+     {GLContext::Extensions_End}},
+    {"depth_texture",
+     GLVersion::GL2,
+     GLESVersion::ES3,
+     GLContext::Extension_None,
+     {GLContext::ARB_depth_texture, GLContext::OES_depth_texture,
+      // Intentionally avoid putting ANGLE_depth_texture here,
+      // it does not offer quite the same functionality.
+      GLContext::Extensions_End}},
+    {"draw_buffers",
+     GLVersion::GL2,
+     GLESVersion::ES3,
+     GLContext::Extension_None,
+     {GLContext::ARB_draw_buffers, GLContext::EXT_draw_buffers,
+      GLContext::Extensions_End}},
+    {"draw_buffers_indexed",
+     GLVersion::GL3,
+     GLESVersion::ES3_2,
+     GLContext::Extension_None,
+     {GLContext::OES_draw_buffers_indexed, GLContext::Extensions_End}},
+    {"draw_instanced",
+     GLVersion::GL3_1,
+     GLESVersion::ES3,
+     GLContext::Extension_None,
+     {GLContext::ARB_draw_instanced, GLContext::EXT_draw_instanced,
+      GLContext::NV_draw_instanced, GLContext::ANGLE_instanced_arrays,
+      GLContext::Extensions_End}},
+    {"element_index_uint",
+     GLVersion::GL2,
+     GLESVersion::ES3,
+     GLContext::Extension_None,
+     {GLContext::OES_element_index_uint, GLContext::Extensions_End}},
+    {"ES2_compatibility",
+     kGLCoreVersionForES2Compat,
+     GLESVersion::ES2,                  // OpenGL ES version
+     GLContext::ARB_ES2_compatibility,  // no suffix on ARB extension
+     {GLContext::Extensions_End}},
+    {"ES3_compatibility",
+     kGLCoreVersionForES3Compat,
+     GLESVersion::ES3,                  // OpenGL ES version
+     GLContext::ARB_ES3_compatibility,  // no suffix on ARB extension
+     {GLContext::Extensions_End}},
+    {"EXT_color_buffer_float",
+     GLVersion::GL3,
+     GLESVersion::ES3_2,
+     GLContext::Extension_None,
+     {GLContext::EXT_color_buffer_float, GLContext::Extensions_End}},
+    {// Removes clamping for float color outputs from frag shaders.
+     "frag_color_float",
+     GLVersion::GL3,
+     GLESVersion::ES3,
+     GLContext::Extension_None,
+     {GLContext::ARB_color_buffer_float, GLContext::EXT_color_buffer_float,
+      GLContext::EXT_color_buffer_half_float,
+      GLContext::CHROMIUM_color_buffer_float_rgba, GLContext::Extensions_End}},
+    {"frag_depth",
+     GLVersion::GL2,
+     GLESVersion::ES3,
+     GLContext::Extension_None,
+     {GLContext::EXT_frag_depth, GLContext::Extensions_End}},
+    {// Check for just the blit framebuffer blit part of
+     // ARB_framebuffer_object
+     "framebuffer_blit",
+     GLVersion::GL3,
+     GLESVersion::ES3,
+     GLContext::ARB_framebuffer_object,
+     {GLContext::ANGLE_framebuffer_blit, GLContext::EXT_framebuffer_blit,
+      GLContext::NV_framebuffer_blit, GLContext::Extensions_End}},
+    {// Check for just the multisample renderbuffer part of
+     // ARB_framebuffer_object
+     "framebuffer_multisample",
+     GLVersion::GL3,
+     GLESVersion::ES3,
+     GLContext::ARB_framebuffer_object,
+     {GLContext::ANGLE_framebuffer_multisample,
+      GLContext::APPLE_framebuffer_multisample,
+      GLContext::EXT_framebuffer_multisample,
+      GLContext::EXT_multisampled_render_to_texture,
+      GLContext::Extensions_End}},
+    {// ARB_framebuffer_object support
+     "framebuffer_object",
+     GLVersion::GL3,
+     GLESVersion::ES3,
+     GLContext::ARB_framebuffer_object,
+     {GLContext::Extensions_End}},
+    {// EXT_framebuffer_object/OES_framebuffer_object support
+     "framebuffer_object_EXT_OES",
+     GLVersion::GL3,
+     GLESVersion::ES2,
+     GLContext::Extension_None,
+     {GLContext::EXT_framebuffer_object, GLContext::OES_framebuffer_object,
+      GLContext::Extensions_End}},
+    {"get_integer_indexed",
+     GLVersion::GL3,
+     GLESVersion::ES3,
+     GLContext::Extension_None,
+     {GLContext::EXT_draw_buffers2, GLContext::Extensions_End}},
+    {"get_integer64_indexed",
+     GLVersion::GL3_2,
+     GLESVersion::ES3,
+     GLContext::Extension_None,
+     {GLContext::Extensions_End}},
+    {"get_query_object_i64v",
+     GLVersion::GL3_3,
+     GLESVersion::NONE,
+     GLContext::ARB_timer_query,
+     {GLContext::ANGLE_timer_query, GLContext::EXT_disjoint_timer_query,
+      GLContext::EXT_timer_query, GLContext::Extensions_End}},
+    {
+        "get_query_object_iv",
+        GLVersion::GL2,
+        GLESVersion::NONE,
+        GLContext::Extension_None,
+        {GLContext::Extensions_End}
+        /*
+         * XXX_get_query_object_iv only provide GetQueryObjectiv provided by
+         * ARB_occlusion_query (added by OpenGL 2.0).
+         */
+    },
+    {"gpu_shader4",
+     GLVersion::GL3,
+     GLESVersion::ES3,
+     GLContext::Extension_None,
+     {GLContext::EXT_gpu_shader4, GLContext::Extensions_End}},
+    {"instanced_arrays",
+     GLVersion::GL3_3,
+     GLESVersion::ES3,
+     GLContext::Extension_None,
+     {GLContext::ARB_instanced_arrays, GLContext::NV_instanced_arrays,
+      GLContext::ANGLE_instanced_arrays, GLContext::Extensions_End}},
+    {
+        "instanced_non_arrays",
+        GLVersion::GL3_3,
+        GLESVersion::ES3,
+        GLContext::Extension_None,
+        {GLContext::ARB_instanced_arrays, GLContext::Extensions_End}
+        /* This is an expanded version of `instanced_arrays` that allows for all
+         * enabled active attrib arrays to have non-zero divisors.
+         * ANGLE_instanced_arrays and NV_instanced_arrays forbid this, but GLES3
+         * has no such restriction.
+         */
+    },
+    {"internalformat_query",
+     GLVersion::GL4_2,
+     GLESVersion::ES3,
+     GLContext::ARB_internalformat_query,
+     {GLContext::Extensions_End}},
+    {"invalidate_framebuffer",
+     GLVersion::GL4_3,
+     GLESVersion::ES3,
+     GLContext::ARB_invalidate_subdata,
+     {GLContext::Extensions_End}},
+    {"map_buffer_range",
+     GLVersion::GL3,
+     GLESVersion::ES3,
+     GLContext::ARB_map_buffer_range,
+     {GLContext::EXT_map_buffer_range, GLContext::Extensions_End}},
+    {"multiview",
+     GLVersion::NONE,
+     GLESVersion::NONE,
+     GLContext::Extension_None,
+     {GLContext::ANGLE_multiview, GLContext::OVR_multiview2,
+      GLContext::Extensions_End}},
+    {
+        "occlusion_query",
+        GLVersion::GL2,
+        GLESVersion::NONE,
+        GLContext::Extension_None,
+        {GLContext::Extensions_End}
+        // XXX_occlusion_query depend on ARB_occlusion_query (added in
+        // OpenGL 2.0)
+    },
+    {
+        "occlusion_query_boolean",
+        kGLCoreVersionForES3Compat,
+        GLESVersion::ES3,
+        GLContext::ARB_ES3_compatibility,
+        {GLContext::EXT_occlusion_query_boolean, GLContext::Extensions_End}
+        /*
+         * XXX_occlusion_query_boolean provide ANY_SAMPLES_PASSED_CONSERVATIVE,
+         * but EXT_occlusion_query_boolean is only a OpenGL ES extension. But
+         * it is supported on desktop if ARB_ES3_compatibility because
+         * EXT_occlusion_query_boolean (added in OpenGL ES 3.0).
+         */
+    },
+    {
+        "occlusion_query2",
+        GLVersion::GL3_3,
+        GLESVersion::ES3,
+        GLContext::Extension_None,
+        {GLContext::ARB_occlusion_query2, GLContext::ARB_ES3_compatibility,
+         GLContext::EXT_occlusion_query_boolean, GLContext::Extensions_End}
+        /*
+         * XXX_occlusion_query2 (add in OpenGL 3.3) provide ANY_SAMPLES_PASSED,
+         * which is provided by ARB_occlusion_query2,
+         * EXT_occlusion_query_boolean (added in OpenGL ES 3.0) and
+         * ARB_ES3_compatibility
+         */
+    },
+    {"packed_depth_stencil",
+     GLVersion::GL3,
+     GLESVersion::ES3,
+     GLContext::Extension_None,
+     {GLContext::EXT_packed_depth_stencil, GLContext::OES_packed_depth_stencil,
+      GLContext::Extensions_End}},
+    {"prim_restart",
+     GLVersion::GL3_1,
+     GLESVersion::NONE,
+     GLContext::Extension_None,
+     {// GLContext::NV_primitive_restart, // Has different enum values.
+      GLContext::Extensions_End}},
+    {"prim_restart_fixed",
+     kGLCoreVersionForES3Compat,
+     GLESVersion::ES3,
+     GLContext::ARB_ES3_compatibility,
+     {GLContext::Extensions_End}},
+    {"provoking_vertex",
+     GLVersion::GL3_2,
+     GLESVersion::NONE,
+     GLContext::ARB_provoking_vertex,
+     {GLContext::ANGLE_provoking_vertex, GLContext::EXT_provoking_vertex,
+      GLContext::Extensions_End}},
+    {"query_counter",
+     GLVersion::GL3_3,
+     GLESVersion::NONE,
+     GLContext::ARB_timer_query,
+     {GLContext::ANGLE_timer_query, GLContext::EXT_disjoint_timer_query,
+      // EXT_timer_query does NOT support GL_TIMESTAMP retrieval with
+      // QueryCounter.
+      GLContext::Extensions_End}},
+    {
+        "query_objects",
+        GLVersion::GL2,
+        GLESVersion::ES3,
+        GLContext::Extension_None,
+        {GLContext::ANGLE_timer_query, GLContext::EXT_disjoint_timer_query,
+         GLContext::EXT_occlusion_query_boolean, GLContext::Extensions_End}
+        /*
+         * XXX_query_objects only provide entry points commonly supported by
+         * ARB_occlusion_query (added in OpenGL 2.0),
+         * EXT_occlusion_query_boolean (added in OpenGL ES 3.0), and
+         * ARB_timer_query (added in OpenGL 3.3)
+         */
+    },
+    {"query_time_elapsed",
+     GLVersion::GL3_3,
+     GLESVersion::NONE,
+     GLContext::ARB_timer_query,
+     {GLContext::ANGLE_timer_query, GLContext::EXT_disjoint_timer_query,
+      GLContext::EXT_timer_query, GLContext::Extensions_End}},
+    {"read_buffer",
+     GLVersion::GL2,
+     GLESVersion::ES3,
+     GLContext::Extension_None,
+     {GLContext::Extensions_End}},
+    {"renderbuffer_color_float",
+     GLVersion::GL3,
+     GLESVersion::ES3_2,
+     GLContext::Extension_None,
+     {GLContext::ARB_texture_float, GLContext::EXT_color_buffer_float,
+      GLContext::CHROMIUM_color_buffer_float_rgba, GLContext::Extensions_End}},
+    {"renderbuffer_color_half_float",
+     GLVersion::GL3,
+     GLESVersion::ES3_2,
+     GLContext::Extension_None,
+     {GLContext::ARB_texture_float, GLContext::EXT_color_buffer_float,
+      GLContext::EXT_color_buffer_half_float, GLContext::Extensions_End}},
+    {"robust_buffer_access_behavior",
+     GLVersion::NONE,
+     GLESVersion::NONE,
+     GLContext::Extension_None,
+     {GLContext::ARB_robust_buffer_access_behavior,
+      GLContext::KHR_robust_buffer_access_behavior, GLContext::Extensions_End}},
+    {"robustness",
+     GLVersion::NONE,
+     GLESVersion::NONE,
+     GLContext::Extension_None,
+     {GLContext::ARB_robustness, GLContext::EXT_robustness,
+      GLContext::KHR_robustness, GLContext::Extensions_End}},
+    {"sRGB",
+     GLVersion::GL3,
+     GLESVersion::ES3,
+     GLContext::ARB_framebuffer_sRGB,
+     {GLContext::EXT_sRGB, GLContext::EXT_framebuffer_sRGB,
+      GLContext::Extensions_End}},
+    {"sampler_objects",
+     GLVersion::GL3_3,
+     GLESVersion::ES3,
+     GLContext::ARB_sampler_objects,
+     {GLContext::Extensions_End}},
+    {"seamless_cube_map_opt_in",
+     GLVersion::GL3_2,
+     GLESVersion::NONE,
+     GLContext::ARB_seamless_cube_map,
+     {GLContext::Extensions_End}},
+    {"shader_texture_lod",
+     GLVersion::GL3,
+     GLESVersion::ES3,
+     GLContext::Extension_None,
+     {GLContext::ARB_shader_texture_lod, GLContext::EXT_shader_texture_lod,
+      GLContext::Extensions_End}},
+    {// Do we have separate DRAW and READ framebuffer bind points?
+     "split_framebuffer",
+     GLVersion::GL3,
+     GLESVersion::ES3,
+     GLContext::ARB_framebuffer_object,
+     {GLContext::ANGLE_framebuffer_blit,
+      GLContext::APPLE_framebuffer_multisample, GLContext::EXT_framebuffer_blit,
+      GLContext::NV_framebuffer_blit, GLContext::Extensions_End}},
+    {"standard_derivatives",
+     GLVersion::GL2,
+     GLESVersion::ES3,
+     GLContext::Extension_None,
+     {GLContext::OES_standard_derivatives, GLContext::Extensions_End}},
+    {"sync",
+     GLVersion::GL3_2,
+     GLESVersion::ES3,
+     GLContext::Extension_None,
+     {GLContext::ARB_sync, GLContext::APPLE_sync, GLContext::Extensions_End}},
+    {"texture_3D",
+     GLVersion::GL1_2,
+     GLESVersion::ES3,
+     GLContext::Extension_None,
+     {GLContext::OES_texture_3D, GLContext::Extensions_End}},
+    {"texture_3D_compressed",
+     GLVersion::GL1_3,
+     GLESVersion::ES3,
+     GLContext::Extension_None,
+     {GLContext::ARB_texture_compression, GLContext::OES_texture_3D,
+      GLContext::Extensions_End}},
+    {"texture_3D_copy",
+     GLVersion::GL1_2,
+     GLESVersion::ES3,
+     GLContext::Extension_None,
+     {GLContext::EXT_copy_texture, GLContext::OES_texture_3D,
+      GLContext::Extensions_End}},
+    {"texture_compression_bptc",
+     GLVersion::GL4_2,
+     GLESVersion::NONE,
+     GLContext::Extension_None,
+     {GLContext::ARB_texture_compression_bptc,
+      GLContext::EXT_texture_compression_bptc, GLContext::Extensions_End}},
+    {"texture_compression_rgtc",
+     GLVersion::GL3,
+     GLESVersion::NONE,
+     GLContext::Extension_None,
+     {GLContext::ARB_texture_compression_rgtc,
+      GLContext::EXT_texture_compression_rgtc, GLContext::Extensions_End}},
+    {"texture_float",
+     GLVersion::GL3,
+     GLESVersion::ES3,
+     GLContext::Extension_None,
+     {GLContext::ARB_texture_float, GLContext::OES_texture_float,
+      GLContext::Extensions_End}},
+    {"texture_float_linear",
+     GLVersion::GL3_1,
+     GLESVersion::NONE,
+     GLContext::Extension_None,
+     {GLContext::ARB_texture_float, GLContext::OES_texture_float_linear,
+      GLContext::Extensions_End}},
+    {
+        "texture_half_float",
+        GLVersion::GL3,
+        GLESVersion::ES3,
+        GLContext::Extension_None,
+        {GLContext::ARB_half_float_pixel, GLContext::ARB_texture_float,
+         GLContext::NV_half_float, GLContext::Extensions_End}
+        /**
+         * We are not including OES_texture_half_float in this feature, because:
+         *   GL_HALF_FLOAT     = 0x140B
+         *   GL_HALF_FLOAT_ARB = 0x140B == GL_HALF_FLOAT
+         *   GL_HALF_FLOAT_NV  = 0x140B == GL_HALF_FLOAT
+         *   GL_HALF_FLOAT_OES = 0x8D61 != GL_HALF_FLOAT
+         * WebGL handles this specifically with an OES_texture_half_float check.
+         */
+    },
+    {"texture_half_float_linear",
+     GLVersion::GL3_1,
+     GLESVersion::ES3,
+     GLContext::Extension_None,
+     {GLContext::ARB_half_float_pixel, GLContext::ARB_texture_float,
+      GLContext::NV_half_float, GLContext::OES_texture_half_float_linear,
+      GLContext::Extensions_End}},
+    {"texture_non_power_of_two",
+     GLVersion::GL2,
+     GLESVersion::ES3,
+     GLContext::Extension_None,
+     {GLContext::ARB_texture_non_power_of_two, GLContext::OES_texture_npot,
+      GLContext::Extensions_End}},
+    {"texture_norm16",
+     GLVersion::GL3_1,
+     GLESVersion::ES3_1,
+     GLContext::EXT_texture_norm16,
+     {GLContext::Extensions_End}},
+    {"texture_rg",
+     GLVersion::GL3,
+     GLESVersion::ES3,
+     GLContext::ARB_texture_rg,
+     {GLContext::Extensions_End}},
+    {"texture_storage",
+     GLVersion::GL4_2,
+     GLESVersion::ES3,
+     GLContext::ARB_texture_storage,
+     {/*
+       * Not including GL_EXT_texture_storage here because it
+       * doesn't guarantee glTexStorage3D, which is required for
+       * WebGL 2.
+       */
+      GLContext::Extensions_End}},
+    {"texture_swizzle",
+     GLVersion::GL3_3,
+     GLESVersion::ES3,
+     GLContext::ARB_texture_swizzle,
+     {GLContext::Extensions_End}},
+    {"transform_feedback2",
+     GLVersion::GL4,
+     GLESVersion::ES3,
+     GLContext::ARB_transform_feedback2,
+     {GLContext::NV_transform_feedback2, GLContext::Extensions_End}},
+    {"uniform_buffer_object",
+     GLVersion::GL3_1,
+     GLESVersion::ES3,
+     GLContext::ARB_uniform_buffer_object,
+     {GLContext::Extensions_End}},
+    {"uniform_matrix_nonsquare",
+     GLVersion::GL2_1,
+     GLESVersion::ES3,
+     GLContext::Extension_None,
+     {GLContext::Extensions_End}},
+    {"vertex_array_object",
+     GLVersion::GL3,
+     GLESVersion::ES3,
+     GLContext::ARB_vertex_array_object,  // ARB extension
+     {GLContext::OES_vertex_array_object, GLContext::APPLE_vertex_array_object,
+      GLContext::Extensions_End}}};
+
+static inline const FeatureInfo& GetFeatureInfo(GLFeature feature) {
+  static_assert(MOZ_ARRAY_LENGTH(sFeatureInfoArr) == size_t(GLFeature::EnumMax),
+                "Mismatched lengths for sFeatureInfoInfos and GLFeature enums");
+
+  MOZ_ASSERT(feature < GLFeature::EnumMax,
+             "GLContext::GetFeatureInfoInfo : unknown <feature>");
+
+  return sFeatureInfoArr[size_t(feature)];
+}
+
+static inline uint32_t ProfileVersionForFeature(GLFeature feature,
+                                                ContextProfile profile) {
+  MOZ_ASSERT(profile != ContextProfile::Unknown,
+             "GLContext::ProfileVersionForFeature : unknown <profile>");
+
+  const FeatureInfo& featureInfo = GetFeatureInfo(feature);
+
+  if (profile == ContextProfile::OpenGLES)
+    return (uint32_t)featureInfo.mOpenGLESVersion;
+
+  return (uint32_t)featureInfo.mOpenGLVersion;
+}
+
+static bool IsFeaturePartOfProfileVersion(GLFeature feature,
+                                          ContextProfile profile,
+                                          unsigned int version) {
+  unsigned int profileVersion = ProfileVersionForFeature(feature, profile);
+
+  /**
+   * if `profileVersion` is zero, it means that no version of the profile
+   * added support for the feature.
+   */
+  return profileVersion && version >= profileVersion;
+}
+
+bool GLContext::IsFeatureProvidedByCoreSymbols(GLFeature feature) {
+  if (IsFeaturePartOfProfileVersion(feature, mProfile, mVersion)) return true;
+
+  if (IsExtensionSupported(
+          GetFeatureInfo(feature).mARBExtensionWithoutARBSuffix))
+    return true;
+
+  return false;
+}
+
+const char* GLContext::GetFeatureName(GLFeature feature) {
+  return GetFeatureInfo(feature).mName;
+}
+
+void GLContext::InitFeatures() {
+  for (size_t featureId = 0; featureId < size_t(GLFeature::EnumMax);
+       featureId++) {
+    GLFeature feature = GLFeature(featureId);
+
+    if (IsFeaturePartOfProfileVersion(feature, mProfile, mVersion)) {
+      mAvailableFeatures[featureId] = true;
+      continue;
+    }
+
+    mAvailableFeatures[featureId] = false;
+
+    const FeatureInfo& featureInfo = GetFeatureInfo(feature);
+
+    if (IsExtensionSupported(featureInfo.mARBExtensionWithoutARBSuffix)) {
+      mAvailableFeatures[featureId] = true;
+      continue;
+    }
+
+    for (size_t j = 0; true; j++) {
+      MOZ_ASSERT(j < kMAX_EXTENSION_GROUP_SIZE,
+                 "kMAX_EXTENSION_GROUP_SIZE too small");
+
+      if (featureInfo.mExtensions[j] == GLContext::Extensions_End) break;
+
+      if (IsExtensionSupported(featureInfo.mExtensions[j])) {
+        mAvailableFeatures[featureId] = true;
+        break;
+      }
+    }
+  }
+
+  if (ShouldDumpExts()) {
+    for (size_t featureId = 0; featureId < size_t(GLFeature::EnumMax);
+         featureId++) {
+      GLFeature feature = GLFeature(featureId);
+      printf_stderr("[%s] Feature::%s\n",
+                    IsSupported(feature) ? "enabled" : "disabled",
+                    GetFeatureName(feature));
+    }
+  }
+}
+
+void GLContext::MarkUnsupported(GLFeature feature) {
+  mAvailableFeatures[size_t(feature)] = false;
+
+  const FeatureInfo& featureInfo = GetFeatureInfo(feature);
+
+  for (size_t i = 0; true; i++) {
+    MOZ_ASSERT(i < kMAX_EXTENSION_GROUP_SIZE,
+               "kMAX_EXTENSION_GROUP_SIZE too small");
+
+    if (featureInfo.mExtensions[i] == GLContext::Extensions_End) break;
+
+    MarkExtensionUnsupported(featureInfo.mExtensions[i]);
+  }
+
+  MOZ_ASSERT(!IsSupported(feature), "GLContext::MarkUnsupported has failed!");
+
+  NS_WARNING(
+      nsPrintfCString("%s marked as unsupported", GetFeatureName(feature))
+          .get());
+}
+
+} /* namespace gl */
+} /* namespace mozilla */