The Tor Browser: gfx/gl/GLContext.cpp@97036ab72558 (annotated)

gfx/gl/GLContext.cpp@97036ab72558 (annotated)

gfx/gl/GLContext.cpp

Tue, 06 Jan 2015 21:39:09 +0100

author: Michael Schloh von Bennewitz <michael@schloh.com>
date: Tue, 06 Jan 2015 21:39:09 +0100
branch: TOR_BUG_9701
changeset 8: 97036ab72558
permissions: -rw-r--r--

Conditionally force memory storage according to privacy.thirdparty.isolate;
This solves Tor bug #9701, complying with disk avoidance documented in
https://www.torproject.org/projects/torbrowser/design/#disk-avoidance.

 /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
 /* vim: set ts=8 sts=4 et sw=4 tw=80: */
 /* 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 <algorithm>
 #include <stdio.h>
 #include <string.h>
 #include <ctype.h>
 #include "GLContext.h"
 #include "GLBlitHelper.h"
 #include "GLBlitTextureImageHelper.h"
 #include "GLReadTexImageHelper.h"
 #include "gfxCrashReporterUtils.h"
 #include "gfxUtils.h"
 #include "GLContextProvider.h"
 #include "GLTextureImage.h"
 #include "nsPrintfCString.h"
 #include "nsThreadUtils.h"
 #include "prenv.h"
 #include "prlink.h"
 #include "ScopedGLHelpers.h"
 #include "SharedSurfaceGL.h"
 #include "SurfaceStream.h"
 #include "GfxTexturesReporter.h"
 #include "TextureGarbageBin.h"
 #include "gfx2DGlue.h"
 #include "gfxPrefs.h"
 #include "OGLShaderProgram.h" // for ShaderProgramType
 #include "mozilla/DebugOnly.h"
 #ifdef XP_MACOSX
 #include <CoreServices/CoreServices.h>
 #include "gfxColor.h"
 #endif
 #if defined(MOZ_WIDGET_COCOA)
 #include "nsCocoaFeatures.h"
 #endif
 using namespace mozilla::gfx;
 using namespace mozilla::layers;
 namespace mozilla {
 namespace gl {
 #ifdef DEBUG
 unsigned GLContext::sCurrentGLContextTLS = -1;
 #endif
 uint32_t GLContext::sDebugMode = 0;
 #define MAX_SYMBOL_LENGTH 128
 #define MAX_SYMBOL_NAMES 5
 // should match the order of GLExtensions, and be null-terminated.
 static const char *sExtensionNames[] = {
     "GL_EXT_framebuffer_object",
     "GL_ARB_framebuffer_object",
     "GL_ARB_texture_rectangle",
     "GL_EXT_bgra",
     "GL_EXT_texture_format_BGRA8888",
     "GL_OES_depth24",
     "GL_OES_depth32",
     "GL_OES_stencil8",
     "GL_OES_texture_npot",
     "GL_ARB_depth_texture",
     "GL_OES_depth_texture",
     "GL_OES_packed_depth_stencil",
     "GL_IMG_read_format",
     "GL_EXT_read_format_bgra",
     "GL_APPLE_client_storage",
     "GL_APPLE_texture_range",
     "GL_ARB_texture_non_power_of_two",
     "GL_ARB_pixel_buffer_object",
     "GL_ARB_ES2_compatibility",
     "GL_ARB_ES3_compatibility",
     "GL_OES_texture_float",
     "GL_OES_texture_float_linear",
     "GL_ARB_texture_float",
     "GL_OES_texture_half_float",
     "GL_OES_texture_half_float_linear",
     "GL_NV_half_float",
     "GL_EXT_color_buffer_float",
     "GL_EXT_color_buffer_half_float",
     "GL_ARB_color_buffer_float",
     "GL_EXT_unpack_subimage",
     "GL_OES_standard_derivatives",
     "GL_EXT_texture_filter_anisotropic",
     "GL_EXT_texture_compression_s3tc",
     "GL_EXT_texture_compression_dxt1",
     "GL_ANGLE_texture_compression_dxt3",
     "GL_ANGLE_texture_compression_dxt5",
     "GL_AMD_compressed_ATC_texture",
     "GL_IMG_texture_compression_pvrtc",
     "GL_EXT_framebuffer_blit",
     "GL_ANGLE_framebuffer_blit",
     "GL_EXT_framebuffer_multisample",
     "GL_ANGLE_framebuffer_multisample",
     "GL_OES_rgb8_rgba8",
     "GL_ARB_robustness",
     "GL_EXT_robustness",
     "GL_ARB_sync",
     "GL_OES_EGL_image",
     "GL_OES_EGL_sync",
     "GL_OES_EGL_image_external",
     "GL_EXT_packed_depth_stencil",
     "GL_OES_element_index_uint",
     "GL_OES_vertex_array_object",
     "GL_ARB_vertex_array_object",
     "GL_APPLE_vertex_array_object",
     "GL_ARB_draw_buffers",
     "GL_EXT_draw_buffers",
     "GL_EXT_gpu_shader4",
     "GL_EXT_blend_minmax",
     "GL_ARB_draw_instanced",
     "GL_EXT_draw_instanced",
     "GL_NV_draw_instanced",
     "GL_ARB_instanced_arrays",
     "GL_NV_instanced_arrays",
     "GL_ANGLE_instanced_arrays",
     "GL_EXT_occlusion_query_boolean",
     "GL_ARB_occlusion_query2",
     "GL_EXT_transform_feedback",
     "GL_NV_transform_feedback",
     "GL_ANGLE_depth_texture",
     "GL_EXT_sRGB",
     "GL_EXT_texture_sRGB",
     "GL_ARB_framebuffer_sRGB",
     "GL_EXT_framebuffer_sRGB",
     "GL_KHR_debug",
     "GL_ARB_half_float_pixel",
     "GL_EXT_frag_depth",
     "GL_OES_compressed_ETC1_RGB8_texture",
     "GL_EXT_draw_range_elements",
     nullptr
 };
 static bool
 ParseGLVersion(GLContext* gl, unsigned int* version)
 {
     GLenum error = gl->fGetError();
     if (error != LOCAL_GL_NO_ERROR) {
         MOZ_ASSERT(false, "An OpenGL error has been triggered before.");
         return false;
     }
     /**
      * B2G emulator bug work around: The emulator implements OpenGL ES 2.0 on
      * OpenGL 3.2. The bug is that GetIntegerv(LOCAL_GL_{MAJOR,MINOR}_VERSION)
      * returns OpenGL 3.2 instead of generating an error.
      */
     if (!gl->IsGLES())
     {
         /**
          * OpenGL 3.1 and OpenGL ES 3.0 both introduce GL_{MAJOR,MINOR}_VERSION
          * with GetIntegerv. So we first try those constants even though we
          * might not have an OpenGL context supporting them, has this is a
          * better way than parsing GL_VERSION.
          */
         GLint majorVersion = 0;
         GLint minorVersion = 0;
         gl->fGetIntegerv(LOCAL_GL_MAJOR_VERSION, &majorVersion);
         gl->fGetIntegerv(LOCAL_GL_MINOR_VERSION, &minorVersion);
         // If it's not an OpenGL (ES) 3.0 context, we will have an error
         error = gl->fGetError();
         if (error == LOCAL_GL_NO_ERROR &&
             majorVersion > 0 &&
             minorVersion >= 0)
         {
             *version = majorVersion * 100 + minorVersion * 10;
             return true;
         }
     }
     /**
      * We were not able to use GL_{MAJOR,MINOR}_VERSION, so we parse
      * GL_VERSION.
      *
      *
      * OpenGL 2.x, 3.x, 4.x specifications:
      *  The VERSION and SHADING_LANGUAGE_VERSION strings are laid out as follows:
      *
      *    <version number><space><vendor-specific information>
      *
      *  The version number is either of the form major_number.minor_number or
      *  major_number.minor_number.release_number, where the numbers all have
      *  one or more digits.
      *
      *
      * OpenGL ES 2.0, 3.0 specifications:
      *  The VERSION string is laid out as follows:
      *
      *     "OpenGL ES N.M vendor-specific information"
      *
      *  The version number is either of the form major_number.minor_number or
      *  major_number.minor_number.release_number, where the numbers all have
      *  one or more digits.
      *
      *
      * Note:
      *  We don't care about release_number.
      */
     const char* versionString = (const char*)gl->fGetString(LOCAL_GL_VERSION);
     error = gl->fGetError();
     if (error != LOCAL_GL_NO_ERROR) {
         MOZ_ASSERT(false, "glGetString(GL_VERSION) has generated an error");
         return false;
     } else if (!versionString) {
         MOZ_ASSERT(false, "glGetString(GL_VERSION) has returned 0");
         return false;
     }
     const char kGLESVersionPrefix[] = "OpenGL ES ";
     if (strncmp(versionString, kGLESVersionPrefix, strlen(kGLESVersionPrefix)) == 0) {
         versionString += strlen(kGLESVersionPrefix);
     }
     const char* itr = versionString;
     char* end = nullptr;
     int majorVersion = (int)strtol(itr, &end, 10);
     if (!end) {
         MOZ_ASSERT(false, "Failed to parse the GL major version number.");
         return false;
     } else if (*end != '.') {
         MOZ_ASSERT(false, "Failed to parse GL's major-minor version number separator.");
         return false;
     }
     // we skip the '.' between the major and the minor version
     itr = end + 1;
     end = nullptr;
     int minorVersion = (int)strtol(itr, &end, 10);
     if (!end) {
         MOZ_ASSERT(false, "Failed to parse GL's minor version number.");
         return false;
     }
     if (majorVersion <= 0 || majorVersion >= 100) {
         MOZ_ASSERT(false, "Invalid major version.");
         return false;
     } else if (minorVersion < 0 || minorVersion >= 10) {
         MOZ_ASSERT(false, "Invalid minor version.");
         return false;
     }
     *version = (unsigned int)(majorVersion * 100 + minorVersion * 10);
     return true;
 }
 GLContext::GLContext(const SurfaceCaps& caps,
           GLContext* sharedContext,
           bool isOffscreen)
   : mInitialized(false),
     mIsOffscreen(isOffscreen),
     mContextLost(false),
     mVersion(0),
     mProfile(ContextProfile::Unknown),
     mVendor(GLVendor::Other),
     mRenderer(GLRenderer::Other),
     mHasRobustness(false),
 #ifdef DEBUG
     mGLError(LOCAL_GL_NO_ERROR),
 #endif
     mSharedContext(sharedContext),
     mCaps(caps),
     mScreen(nullptr),
     mLockedSurface(nullptr),
     mMaxTextureSize(0),
     mMaxCubeMapTextureSize(0),
     mMaxTextureImageSize(0),
     mMaxRenderbufferSize(0),
     mNeedsTextureSizeChecks(false),
     mWorkAroundDriverBugs(true)
 {
     mOwningThread = NS_GetCurrentThread();
 }
 GLContext::~GLContext() {
     NS_ASSERTION(IsDestroyed(), "GLContext implementation must call MarkDestroyed in destructor!");
 #ifdef DEBUG
     if (mSharedContext) {
         GLContext *tip = mSharedContext;
         while (tip->mSharedContext)
             tip = tip->mSharedContext;
         tip->SharedContextDestroyed(this);
         tip->ReportOutstandingNames();
     } else {
         ReportOutstandingNames();
     }
 #endif
 }
 bool
 GLContext::InitWithPrefix(const char *prefix, bool trygl)
 {
     ScopedGfxFeatureReporter reporter("GL Context");
     if (mInitialized) {
         reporter.SetSuccessful();
         return true;
     }
     mWorkAroundDriverBugs = gfxPrefs::WorkAroundDriverBugs();
     SymLoadStruct symbols[] = {
         { (PRFuncPtr*) &mSymbols.fActiveTexture, { "ActiveTexture", "ActiveTextureARB", nullptr } },
         { (PRFuncPtr*) &mSymbols.fAttachShader, { "AttachShader", "AttachShaderARB", nullptr } },
         { (PRFuncPtr*) &mSymbols.fBindAttribLocation, { "BindAttribLocation", "BindAttribLocationARB", nullptr } },
         { (PRFuncPtr*) &mSymbols.fBindBuffer, { "BindBuffer", "BindBufferARB", nullptr } },
         { (PRFuncPtr*) &mSymbols.fBindTexture, { "BindTexture", "BindTextureARB", nullptr } },
         { (PRFuncPtr*) &mSymbols.fBlendColor, { "BlendColor", nullptr } },
         { (PRFuncPtr*) &mSymbols.fBlendEquation, { "BlendEquation", nullptr } },
         { (PRFuncPtr*) &mSymbols.fBlendEquationSeparate, { "BlendEquationSeparate", "BlendEquationSeparateEXT", nullptr } },
         { (PRFuncPtr*) &mSymbols.fBlendFunc, { "BlendFunc", nullptr } },
         { (PRFuncPtr*) &mSymbols.fBlendFuncSeparate, { "BlendFuncSeparate", "BlendFuncSeparateEXT", nullptr } },
         { (PRFuncPtr*) &mSymbols.fBufferData, { "BufferData", nullptr } },
         { (PRFuncPtr*) &mSymbols.fBufferSubData, { "BufferSubData", nullptr } },
         { (PRFuncPtr*) &mSymbols.fClear, { "Clear", nullptr } },
         { (PRFuncPtr*) &mSymbols.fClearColor, { "ClearColor", nullptr } },
         { (PRFuncPtr*) &mSymbols.fClearStencil, { "ClearStencil", nullptr } },
         { (PRFuncPtr*) &mSymbols.fColorMask, { "ColorMask", nullptr } },
         { (PRFuncPtr*) &mSymbols.fCompressedTexImage2D, {"CompressedTexImage2D", nullptr} },
         { (PRFuncPtr*) &mSymbols.fCompressedTexSubImage2D, {"CompressedTexSubImage2D", nullptr} },
         { (PRFuncPtr*) &mSymbols.fCullFace, { "CullFace", nullptr } },
         { (PRFuncPtr*) &mSymbols.fDetachShader, { "DetachShader", "DetachShaderARB", nullptr } },
         { (PRFuncPtr*) &mSymbols.fDepthFunc, { "DepthFunc", nullptr } },
         { (PRFuncPtr*) &mSymbols.fDepthMask, { "DepthMask", nullptr } },
         { (PRFuncPtr*) &mSymbols.fDisable, { "Disable", nullptr } },
         { (PRFuncPtr*) &mSymbols.fDisableVertexAttribArray, { "DisableVertexAttribArray", "DisableVertexAttribArrayARB", nullptr } },
         { (PRFuncPtr*) &mSymbols.fDrawArrays, { "DrawArrays", nullptr } },
         { (PRFuncPtr*) &mSymbols.fDrawElements, { "DrawElements", nullptr } },
         { (PRFuncPtr*) &mSymbols.fEnable, { "Enable", nullptr } },
         { (PRFuncPtr*) &mSymbols.fEnableVertexAttribArray, { "EnableVertexAttribArray", "EnableVertexAttribArrayARB", nullptr } },
         { (PRFuncPtr*) &mSymbols.fFinish, { "Finish", nullptr } },
         { (PRFuncPtr*) &mSymbols.fFlush, { "Flush", nullptr } },
         { (PRFuncPtr*) &mSymbols.fFrontFace, { "FrontFace", nullptr } },
         { (PRFuncPtr*) &mSymbols.fGetActiveAttrib, { "GetActiveAttrib", "GetActiveAttribARB", nullptr } },
         { (PRFuncPtr*) &mSymbols.fGetActiveUniform, { "GetActiveUniform", "GetActiveUniformARB", nullptr } },
         { (PRFuncPtr*) &mSymbols.fGetAttachedShaders, { "GetAttachedShaders", "GetAttachedShadersARB", nullptr } },
         { (PRFuncPtr*) &mSymbols.fGetAttribLocation, { "GetAttribLocation", "GetAttribLocationARB", nullptr } },
         { (PRFuncPtr*) &mSymbols.fGetIntegerv, { "GetIntegerv", nullptr } },
         { (PRFuncPtr*) &mSymbols.fGetFloatv, { "GetFloatv", nullptr } },
         { (PRFuncPtr*) &mSymbols.fGetBooleanv, { "GetBooleanv", nullptr } },
         { (PRFuncPtr*) &mSymbols.fGetBufferParameteriv, { "GetBufferParameteriv", "GetBufferParameterivARB", nullptr } },
         { (PRFuncPtr*) &mSymbols.fGetError, { "GetError", nullptr } },
         { (PRFuncPtr*) &mSymbols.fGetProgramiv, { "GetProgramiv", "GetProgramivARB", nullptr } },
         { (PRFuncPtr*) &mSymbols.fGetProgramInfoLog, { "GetProgramInfoLog", "GetProgramInfoLogARB", nullptr } },
         { (PRFuncPtr*) &mSymbols.fTexParameteri, { "TexParameteri", nullptr } },
         { (PRFuncPtr*) &mSymbols.fTexParameteriv, { "TexParameteriv", nullptr } },
         { (PRFuncPtr*) &mSymbols.fTexParameterf, { "TexParameterf", nullptr } },
         { (PRFuncPtr*) &mSymbols.fGetString, { "GetString", nullptr } },
         { (PRFuncPtr*) &mSymbols.fGetTexParameterfv, { "GetTexParameterfv", nullptr } },
         { (PRFuncPtr*) &mSymbols.fGetTexParameteriv, { "GetTexParameteriv", nullptr } },
         { (PRFuncPtr*) &mSymbols.fGetUniformfv, { "GetUniformfv", "GetUniformfvARB", nullptr } },
         { (PRFuncPtr*) &mSymbols.fGetUniformiv, { "GetUniformiv", "GetUniformivARB", nullptr } },
         { (PRFuncPtr*) &mSymbols.fGetUniformLocation, { "GetUniformLocation", "GetUniformLocationARB", nullptr } },
         { (PRFuncPtr*) &mSymbols.fGetVertexAttribfv, { "GetVertexAttribfv", "GetVertexAttribfvARB", nullptr } },
         { (PRFuncPtr*) &mSymbols.fGetVertexAttribiv, { "GetVertexAttribiv", "GetVertexAttribivARB", nullptr } },
         { (PRFuncPtr*) &mSymbols.fGetVertexAttribPointerv, { "GetVertexAttribPointerv", nullptr } },
         { (PRFuncPtr*) &mSymbols.fHint, { "Hint", nullptr } },
         { (PRFuncPtr*) &mSymbols.fIsBuffer, { "IsBuffer", "IsBufferARB", nullptr } },
         { (PRFuncPtr*) &mSymbols.fIsEnabled, { "IsEnabled", nullptr } },
         { (PRFuncPtr*) &mSymbols.fIsProgram, { "IsProgram", "IsProgramARB", nullptr } },
         { (PRFuncPtr*) &mSymbols.fIsShader, { "IsShader", "IsShaderARB", nullptr } },
         { (PRFuncPtr*) &mSymbols.fIsTexture, { "IsTexture", "IsTextureARB", nullptr } },
         { (PRFuncPtr*) &mSymbols.fLineWidth, { "LineWidth", nullptr } },
         { (PRFuncPtr*) &mSymbols.fLinkProgram, { "LinkProgram", "LinkProgramARB", nullptr } },
         { (PRFuncPtr*) &mSymbols.fPixelStorei, { "PixelStorei", nullptr } },
         { (PRFuncPtr*) &mSymbols.fPolygonOffset, { "PolygonOffset", nullptr } },
         { (PRFuncPtr*) &mSymbols.fReadPixels, { "ReadPixels", nullptr } },
         { (PRFuncPtr*) &mSymbols.fSampleCoverage, { "SampleCoverage", nullptr } },
         { (PRFuncPtr*) &mSymbols.fScissor, { "Scissor", nullptr } },
         { (PRFuncPtr*) &mSymbols.fStencilFunc, { "StencilFunc", nullptr } },
         { (PRFuncPtr*) &mSymbols.fStencilFuncSeparate, { "StencilFuncSeparate", "StencilFuncSeparateEXT", nullptr } },
         { (PRFuncPtr*) &mSymbols.fStencilMask, { "StencilMask", nullptr } },
         { (PRFuncPtr*) &mSymbols.fStencilMaskSeparate, { "StencilMaskSeparate", "StencilMaskSeparateEXT", nullptr } },
         { (PRFuncPtr*) &mSymbols.fStencilOp, { "StencilOp", nullptr } },
         { (PRFuncPtr*) &mSymbols.fStencilOpSeparate, { "StencilOpSeparate", "StencilOpSeparateEXT", nullptr } },
         { (PRFuncPtr*) &mSymbols.fTexImage2D, { "TexImage2D", nullptr } },
         { (PRFuncPtr*) &mSymbols.fTexSubImage2D, { "TexSubImage2D", nullptr } },
         { (PRFuncPtr*) &mSymbols.fUniform1f, { "Uniform1f", nullptr } },
         { (PRFuncPtr*) &mSymbols.fUniform1fv, { "Uniform1fv", nullptr } },
         { (PRFuncPtr*) &mSymbols.fUniform1i, { "Uniform1i", nullptr } },
         { (PRFuncPtr*) &mSymbols.fUniform1iv, { "Uniform1iv", nullptr } },
         { (PRFuncPtr*) &mSymbols.fUniform2f, { "Uniform2f", nullptr } },
         { (PRFuncPtr*) &mSymbols.fUniform2fv, { "Uniform2fv", nullptr } },
         { (PRFuncPtr*) &mSymbols.fUniform2i, { "Uniform2i", nullptr } },
         { (PRFuncPtr*) &mSymbols.fUniform2iv, { "Uniform2iv", nullptr } },
         { (PRFuncPtr*) &mSymbols.fUniform3f, { "Uniform3f", nullptr } },
         { (PRFuncPtr*) &mSymbols.fUniform3fv, { "Uniform3fv", nullptr } },
         { (PRFuncPtr*) &mSymbols.fUniform3i, { "Uniform3i", nullptr } },
         { (PRFuncPtr*) &mSymbols.fUniform3iv, { "Uniform3iv", nullptr } },
         { (PRFuncPtr*) &mSymbols.fUniform4f, { "Uniform4f", nullptr } },
         { (PRFuncPtr*) &mSymbols.fUniform4fv, { "Uniform4fv", nullptr } },
         { (PRFuncPtr*) &mSymbols.fUniform4i, { "Uniform4i", nullptr } },
         { (PRFuncPtr*) &mSymbols.fUniform4iv, { "Uniform4iv", nullptr } },
         { (PRFuncPtr*) &mSymbols.fUniformMatrix2fv, { "UniformMatrix2fv", nullptr } },
         { (PRFuncPtr*) &mSymbols.fUniformMatrix3fv, { "UniformMatrix3fv", nullptr } },
         { (PRFuncPtr*) &mSymbols.fUniformMatrix4fv, { "UniformMatrix4fv", nullptr } },
         { (PRFuncPtr*) &mSymbols.fUseProgram, { "UseProgram", nullptr } },
         { (PRFuncPtr*) &mSymbols.fValidateProgram, { "ValidateProgram", nullptr } },
         { (PRFuncPtr*) &mSymbols.fVertexAttribPointer, { "VertexAttribPointer", nullptr } },
         { (PRFuncPtr*) &mSymbols.fVertexAttrib1f, { "VertexAttrib1f", nullptr } },
         { (PRFuncPtr*) &mSymbols.fVertexAttrib2f, { "VertexAttrib2f", nullptr } },
         { (PRFuncPtr*) &mSymbols.fVertexAttrib3f, { "VertexAttrib3f", nullptr } },
         { (PRFuncPtr*) &mSymbols.fVertexAttrib4f, { "VertexAttrib4f", nullptr } },
         { (PRFuncPtr*) &mSymbols.fVertexAttrib1fv, { "VertexAttrib1fv", nullptr } },
         { (PRFuncPtr*) &mSymbols.fVertexAttrib2fv, { "VertexAttrib2fv", nullptr } },
         { (PRFuncPtr*) &mSymbols.fVertexAttrib3fv, { "VertexAttrib3fv", nullptr } },
         { (PRFuncPtr*) &mSymbols.fVertexAttrib4fv, { "VertexAttrib4fv", nullptr } },
         { (PRFuncPtr*) &mSymbols.fViewport, { "Viewport", nullptr } },
         { (PRFuncPtr*) &mSymbols.fCompileShader, { "CompileShader", nullptr } },
         { (PRFuncPtr*) &mSymbols.fCopyTexImage2D, { "CopyTexImage2D", nullptr } },
         { (PRFuncPtr*) &mSymbols.fCopyTexSubImage2D, { "CopyTexSubImage2D", nullptr } },
         { (PRFuncPtr*) &mSymbols.fGetShaderiv, { "GetShaderiv", nullptr } },
         { (PRFuncPtr*) &mSymbols.fGetShaderInfoLog, { "GetShaderInfoLog", nullptr } },
         { (PRFuncPtr*) &mSymbols.fGetShaderSource, { "GetShaderSource", nullptr } },
         { (PRFuncPtr*) &mSymbols.fShaderSource, { "ShaderSource", nullptr } },
         { (PRFuncPtr*) &mSymbols.fVertexAttribPointer, { "VertexAttribPointer", nullptr } },
         { (PRFuncPtr*) &mSymbols.fBindFramebuffer, { "BindFramebuffer", "BindFramebufferEXT", nullptr } },
         { (PRFuncPtr*) &mSymbols.fBindRenderbuffer, { "BindRenderbuffer", "BindRenderbufferEXT", nullptr } },
         { (PRFuncPtr*) &mSymbols.fCheckFramebufferStatus, { "CheckFramebufferStatus", "CheckFramebufferStatusEXT", nullptr } },
         { (PRFuncPtr*) &mSymbols.fFramebufferRenderbuffer, { "FramebufferRenderbuffer", "FramebufferRenderbufferEXT", nullptr } },
         { (PRFuncPtr*) &mSymbols.fFramebufferTexture2D, { "FramebufferTexture2D", "FramebufferTexture2DEXT", nullptr } },
         { (PRFuncPtr*) &mSymbols.fGenerateMipmap, { "GenerateMipmap", "GenerateMipmapEXT", nullptr } },
         { (PRFuncPtr*) &mSymbols.fGetFramebufferAttachmentParameteriv, { "GetFramebufferAttachmentParameteriv", "GetFramebufferAttachmentParameterivEXT", nullptr } },
         { (PRFuncPtr*) &mSymbols.fGetRenderbufferParameteriv, { "GetRenderbufferParameteriv", "GetRenderbufferParameterivEXT", nullptr } },
         { (PRFuncPtr*) &mSymbols.fIsFramebuffer, { "IsFramebuffer", "IsFramebufferEXT", nullptr } },
         { (PRFuncPtr*) &mSymbols.fIsRenderbuffer, { "IsRenderbuffer", "IsRenderbufferEXT", nullptr } },
         { (PRFuncPtr*) &mSymbols.fRenderbufferStorage, { "RenderbufferStorage", "RenderbufferStorageEXT", nullptr } },
         { (PRFuncPtr*) &mSymbols.fGenBuffers, { "GenBuffers", "GenBuffersARB", nullptr } },
         { (PRFuncPtr*) &mSymbols.fGenTextures, { "GenTextures", nullptr } },
         { (PRFuncPtr*) &mSymbols.fCreateProgram, { "CreateProgram", "CreateProgramARB", nullptr } },
         { (PRFuncPtr*) &mSymbols.fCreateShader, { "CreateShader", "CreateShaderARB", nullptr } },
         { (PRFuncPtr*) &mSymbols.fGenFramebuffers, { "GenFramebuffers", "GenFramebuffersEXT", nullptr } },
         { (PRFuncPtr*) &mSymbols.fGenRenderbuffers, { "GenRenderbuffers", "GenRenderbuffersEXT", nullptr } },
         { (PRFuncPtr*) &mSymbols.fDeleteBuffers, { "DeleteBuffers", "DeleteBuffersARB", nullptr } },
         { (PRFuncPtr*) &mSymbols.fDeleteTextures, { "DeleteTextures", "DeleteTexturesARB", nullptr } },
         { (PRFuncPtr*) &mSymbols.fDeleteProgram, { "DeleteProgram", "DeleteProgramARB", nullptr } },
         { (PRFuncPtr*) &mSymbols.fDeleteShader, { "DeleteShader", "DeleteShaderARB", nullptr } },
         { (PRFuncPtr*) &mSymbols.fDeleteFramebuffers, { "DeleteFramebuffers", "DeleteFramebuffersEXT", nullptr } },
         { (PRFuncPtr*) &mSymbols.fDeleteRenderbuffers, { "DeleteRenderbuffers", "DeleteRenderbuffersEXT", nullptr } },
         { nullptr, { nullptr } },
     };
     mInitialized = LoadSymbols(&symbols[0], trygl, prefix);
     MakeCurrent();
     if (mInitialized) {
         unsigned int version = 0;
         ParseGLVersion(this, &version);
 #ifdef DEBUG
         printf_stderr("OpenGL version detected: %u\n", version);
         printf_stderr("OpenGL vendor: %s\n", fGetString(LOCAL_GL_VENDOR));
         printf_stderr("OpenGL renderer: %s\n", fGetString(LOCAL_GL_RENDERER));
 #endif
         if (version >= mVersion) {
             mVersion = version;
         }
         // Don't fail if version < mVersion, see bug 999445,
         // Mac OSX 10.6/10.7 machines with Intel GPUs claim only OpenGL 1.4 but
         // have all the GL2+ extensions that we need.
     }
     // Load OpenGL ES 2.0 symbols, or desktop if we aren't using ES 2.
     if (mInitialized) {
         if (IsGLES()) {
             SymLoadStruct symbols_ES2[] = {
                 { (PRFuncPtr*) &mSymbols.fGetShaderPrecisionFormat, { "GetShaderPrecisionFormat", nullptr } },
                 { (PRFuncPtr*) &mSymbols.fClearDepthf, { "ClearDepthf", nullptr } },
                 { (PRFuncPtr*) &mSymbols.fDepthRangef, { "DepthRangef", nullptr } },
                 { nullptr, { nullptr } },
             };
             if (!LoadSymbols(&symbols_ES2[0], trygl, prefix)) {
                 NS_ERROR("OpenGL ES 2.0 supported, but symbols could not be loaded.");
                 mInitialized = false;
             }
         } else {
             SymLoadStruct symbols_desktop[] = {
                 { (PRFuncPtr*) &mSymbols.fClearDepth, { "ClearDepth", nullptr } },
                 { (PRFuncPtr*) &mSymbols.fDepthRange, { "DepthRange", nullptr } },
                 { (PRFuncPtr*) &mSymbols.fReadBuffer, { "ReadBuffer", nullptr } },
                 { (PRFuncPtr*) &mSymbols.fMapBuffer, { "MapBuffer", nullptr } },
                 { (PRFuncPtr*) &mSymbols.fUnmapBuffer, { "UnmapBuffer", nullptr } },
                 { (PRFuncPtr*) &mSymbols.fPointParameterf, { "PointParameterf", nullptr } },
                 { (PRFuncPtr*) &mSymbols.fDrawBuffer, { "DrawBuffer", nullptr } },
                     // These functions are only used by Skia/GL in desktop mode.
                     // Other parts of Gecko should avoid using these
                     { (PRFuncPtr*) &mSymbols.fDrawBuffers, { "DrawBuffers", nullptr } },
                     { (PRFuncPtr*) &mSymbols.fClientActiveTexture, { "ClientActiveTexture", nullptr } },
                     { (PRFuncPtr*) &mSymbols.fDisableClientState, { "DisableClientState", nullptr } },
                     { (PRFuncPtr*) &mSymbols.fEnableClientState, { "EnableClientState", nullptr } },
                     { (PRFuncPtr*) &mSymbols.fLoadIdentity, { "LoadIdentity", nullptr } },
                     { (PRFuncPtr*) &mSymbols.fLoadMatrixf, { "LoadMatrixf", nullptr } },
                     { (PRFuncPtr*) &mSymbols.fMatrixMode, { "MatrixMode", nullptr } },
                     { (PRFuncPtr*) &mSymbols.fTexGeni, { "TexGeni", nullptr } },
                     { (PRFuncPtr*) &mSymbols.fTexGenf, { "TexGenf", nullptr } },
                     { (PRFuncPtr*) &mSymbols.fTexGenfv, { "TexGenfv", nullptr } },
                     { (PRFuncPtr*) &mSymbols.fVertexPointer, { "VertexPointer", nullptr } },
                 { nullptr, { nullptr } },
             };
             if (!LoadSymbols(&symbols_desktop[0], trygl, prefix)) {
                 NS_ERROR("Desktop symbols failed to load.");
                 mInitialized = false;
             }
         }
     }
     const char *glVendorString = nullptr;
     const char *glRendererString = nullptr;
     if (mInitialized) {
         // The order of these strings must match up with the order of the enum
         // defined in GLContext.h for vendor IDs
         glVendorString = (const char *)fGetString(LOCAL_GL_VENDOR);
         if (!glVendorString)
             mInitialized = false;
         const char *vendorMatchStrings[size_t(GLVendor::Other)] = {
                 "Intel",
                 "NVIDIA",
                 "ATI",
                 "Qualcomm",
                 "Imagination",
                 "nouveau",
                 "Vivante",
                 "VMware, Inc."
         };
         mVendor = GLVendor::Other;
         for (size_t i = 0; i < size_t(GLVendor::Other); ++i) {
             if (DoesStringMatch(glVendorString, vendorMatchStrings[i])) {
                 mVendor = GLVendor(i);
                 break;
             }
         }
         // The order of these strings must match up with the order of the enum
         // defined in GLContext.h for renderer IDs
         glRendererString = (const char *)fGetString(LOCAL_GL_RENDERER);
         if (!glRendererString)
             mInitialized = false;
         const char *rendererMatchStrings[size_t(GLRenderer::Other)] = {
                 "Adreno 200",
                 "Adreno 205",
                 "Adreno (TM) 205",
                 "Adreno (TM) 320",
                 "PowerVR SGX 530",
                 "PowerVR SGX 540",
                 "NVIDIA Tegra",
                 "Android Emulator",
                 "Gallium 0.4 on llvmpipe"
         };
         mRenderer = GLRenderer::Other;
         for (size_t i = 0; i < size_t(GLRenderer::Other); ++i) {
             if (DoesStringMatch(glRendererString, rendererMatchStrings[i])) {
                 mRenderer = GLRenderer(i);
                 break;
             }
         }
     }
 #ifdef DEBUG
     if (PR_GetEnv("MOZ_GL_DEBUG"))
         sDebugMode |= DebugEnabled;
     // enables extra verbose output, informing of the start and finish of every GL call.
     // useful e.g. to record information to investigate graphics system crashes/lockups
     if (PR_GetEnv("MOZ_GL_DEBUG_VERBOSE"))
         sDebugMode |= DebugTrace;
     // aborts on GL error. Can be useful to debug quicker code that is known not to generate any GL error in principle.
     if (PR_GetEnv("MOZ_GL_DEBUG_ABORT_ON_ERROR"))
         sDebugMode |= DebugAbortOnError;
 #endif
     if (mInitialized) {
 #ifdef DEBUG
         static bool firstRun = true;
         if (firstRun && DebugMode()) {
             const char *vendors[size_t(GLVendor::Other)] = {
                 "Intel",
                 "NVIDIA",
                 "ATI",
                 "Qualcomm"
             };
             MOZ_ASSERT(glVendorString);
             if (mVendor < GLVendor::Other) {
                 printf_stderr("OpenGL vendor ('%s') recognized as: %s\n",
                               glVendorString, vendors[size_t(mVendor)]);
             } else {
                 printf_stderr("OpenGL vendor ('%s') unrecognized\n", glVendorString);
             }
         }
         firstRun = false;
 #endif
         InitExtensions();
         InitFeatures();
         // Disable extensions with partial or incorrect support.
         if (WorkAroundDriverBugs()) {
             if (Renderer() == GLRenderer::AdrenoTM320) {
                 MarkUnsupported(GLFeature::standard_derivatives);
             }
             if (Vendor() == GLVendor::Vivante) {
                 // bug 958256
                 MarkUnsupported(GLFeature::standard_derivatives);
             }
             if (Vendor() == GLVendor::Imagination &&
                 Renderer() == GLRenderer::SGX540) {
                 // Bug 980048
                 MarkExtensionUnsupported(OES_EGL_sync);
             }
 #ifdef XP_MACOSX
             // The Mac Nvidia driver, for versions up to and including 10.8, don't seem
             // to properly support this.  See 814839
             // this has been fixed in Mac OS X 10.9. See 907946
             if (Vendor() == gl::GLVendor::NVIDIA &&
                 !nsCocoaFeatures::OnMavericksOrLater())
             {
                 MarkUnsupported(GLFeature::depth_texture);
             }
 #endif
             // ANGLE's divisor support is busted. (see bug 916816)
             if (IsANGLE()) {
                 MarkUnsupported(GLFeature::instanced_arrays);
             }
         }
         NS_ASSERTION(!IsExtensionSupported(GLContext::ARB_pixel_buffer_object) ||
                      (mSymbols.fMapBuffer && mSymbols.fUnmapBuffer),
                      "ARB_pixel_buffer_object supported without glMapBuffer/UnmapBuffer being available!");
         if (SupportsRobustness()) {
             mHasRobustness = false;
             if (IsExtensionSupported(ARB_robustness)) {
                 SymLoadStruct robustnessSymbols[] = {
                     { (PRFuncPtr*) &mSymbols.fGetGraphicsResetStatus, { "GetGraphicsResetStatusARB", nullptr } },
                     { nullptr, { nullptr } },
                 };
                 if (!LoadSymbols(&robustnessSymbols[0], trygl, prefix)) {
                     NS_ERROR("GL supports ARB_robustness without supplying GetGraphicsResetStatusARB.");
                     mSymbols.fGetGraphicsResetStatus = nullptr;
                 } else {
                     mHasRobustness = true;
                 }
             }
             if (!IsExtensionSupported(ARB_robustness) &&
                 IsExtensionSupported(EXT_robustness)) {
                 SymLoadStruct robustnessSymbols[] = {
                     { (PRFuncPtr*) &mSymbols.fGetGraphicsResetStatus, { "GetGraphicsResetStatusEXT", nullptr } },
                     { nullptr, { nullptr } },
                 };
                 if (!LoadSymbols(&robustnessSymbols[0], trygl, prefix)) {
                     NS_ERROR("GL supports EXT_robustness without supplying GetGraphicsResetStatusEXT.");
                     mSymbols.fGetGraphicsResetStatus = nullptr;
                 } else {
                     mHasRobustness = true;
                 }
             }
             if (!mHasRobustness) {
                 MarkUnsupported(GLFeature::robustness);
             }
         }
         // Check for aux symbols based on extensions
         if (IsSupported(GLFeature::framebuffer_blit))
         {
             SymLoadStruct auxSymbols[] = {
                 {
                     (PRFuncPtr*) &mSymbols.fBlitFramebuffer,
                     {
                         "BlitFramebuffer",
                         "BlitFramebufferEXT",
                         "BlitFramebufferANGLE",
                         nullptr
                     }
                 },
                 { nullptr, { nullptr } },
             };
             if (!LoadSymbols(&auxSymbols[0], trygl, prefix)) {
                 NS_ERROR("GL supports framebuffer_blit without supplying glBlitFramebuffer");
                 MarkUnsupported(GLFeature::framebuffer_blit);
                 mSymbols.fBlitFramebuffer = nullptr;
             }
         }
         if (IsSupported(GLFeature::framebuffer_multisample))
         {
             SymLoadStruct auxSymbols[] = {
                 {
                     (PRFuncPtr*) &mSymbols.fRenderbufferStorageMultisample,
                     {
                         "RenderbufferStorageMultisample",
                         "RenderbufferStorageMultisampleEXT",
                         "RenderbufferStorageMultisampleANGLE",
                         nullptr
                     }
                 },
                 { nullptr, { nullptr } },
             };
             if (!LoadSymbols(&auxSymbols[0], trygl, prefix)) {
                 NS_ERROR("GL supports framebuffer_multisample without supplying glRenderbufferStorageMultisample");
                 MarkUnsupported(GLFeature::framebuffer_multisample);
                 mSymbols.fRenderbufferStorageMultisample = nullptr;
             }
         }
         if (IsExtensionSupported(ARB_sync)) {
             SymLoadStruct syncSymbols[] = {
                 { (PRFuncPtr*) &mSymbols.fFenceSync,      { "FenceSync",      nullptr } },
                 { (PRFuncPtr*) &mSymbols.fIsSync,         { "IsSync",         nullptr } },
                 { (PRFuncPtr*) &mSymbols.fDeleteSync,     { "DeleteSync",     nullptr } },
                 { (PRFuncPtr*) &mSymbols.fClientWaitSync, { "ClientWaitSync", nullptr } },
                 { (PRFuncPtr*) &mSymbols.fWaitSync,       { "WaitSync",       nullptr } },
                 { (PRFuncPtr*) &mSymbols.fGetInteger64v,  { "GetInteger64v",  nullptr } },
                 { (PRFuncPtr*) &mSymbols.fGetSynciv,      { "GetSynciv",      nullptr } },
                 { nullptr, { nullptr } },
             };
             if (!LoadSymbols(&syncSymbols[0], trygl, prefix)) {
                 NS_ERROR("GL supports ARB_sync without supplying its functions.");
                 MarkExtensionUnsupported(ARB_sync);
                 mSymbols.fFenceSync = nullptr;
                 mSymbols.fIsSync = nullptr;
                 mSymbols.fDeleteSync = nullptr;
                 mSymbols.fClientWaitSync = nullptr;
                 mSymbols.fWaitSync = nullptr;
                 mSymbols.fGetInteger64v = nullptr;
                 mSymbols.fGetSynciv = nullptr;
             }
         }
         if (IsExtensionSupported(OES_EGL_image)) {
             SymLoadStruct imageSymbols[] = {
                 { (PRFuncPtr*) &mSymbols.fEGLImageTargetTexture2D, { "EGLImageTargetTexture2DOES", nullptr } },
                 { (PRFuncPtr*) &mSymbols.fEGLImageTargetRenderbufferStorage, { "EGLImageTargetRenderbufferStorageOES", nullptr } },
                 { nullptr, { nullptr } },
             };
             if (!LoadSymbols(&imageSymbols[0], trygl, prefix)) {
                 NS_ERROR("GL supports OES_EGL_image without supplying its functions.");
                 MarkExtensionUnsupported(OES_EGL_image);
                 mSymbols.fEGLImageTargetTexture2D = nullptr;
                 mSymbols.fEGLImageTargetRenderbufferStorage = nullptr;
             }
         }
         if (IsExtensionSupported(APPLE_texture_range)) {
             SymLoadStruct vaoSymbols[] = {
                 { (PRFuncPtr*) &mSymbols.fTextureRangeAPPLE, { "TextureRangeAPPLE", nullptr } },
                 { nullptr, { nullptr } },
             };
             if (!LoadSymbols(&vaoSymbols[0], trygl, prefix)) {
                 mSymbols.fTextureRangeAPPLE = nullptr;
             }
         }
         if (IsExtensionSupported(ARB_vertex_array_object) ||
             IsExtensionSupported(OES_vertex_array_object)) {
             SymLoadStruct vaoSymbols[] = {
                 { (PRFuncPtr*) &mSymbols.fIsVertexArray, { "IsVertexArray", "IsVertexArrayOES", nullptr } },
                 { (PRFuncPtr*) &mSymbols.fGenVertexArrays, { "GenVertexArrays", "GenVertexArraysOES", nullptr } },
                 { (PRFuncPtr*) &mSymbols.fBindVertexArray, { "BindVertexArray", "BindVertexArrayOES", nullptr } },
                 { (PRFuncPtr*) &mSymbols.fDeleteVertexArrays, { "DeleteVertexArrays", "DeleteVertexArraysOES", nullptr } },
                 { nullptr, { nullptr } },
             };
             if (!LoadSymbols(&vaoSymbols[0], trygl, prefix)) {
                 NS_ERROR("GL supports Vertex Array Object without supplying its functions.");
                 MarkUnsupported(GLFeature::vertex_array_object);
                 mSymbols.fIsVertexArray = nullptr;
                 mSymbols.fGenVertexArrays = nullptr;
                 mSymbols.fBindVertexArray = nullptr;
                 mSymbols.fDeleteVertexArrays = nullptr;
             }
         }
         else if (IsExtensionSupported(APPLE_vertex_array_object)) {
             /*
              * separate call to LoadSymbols with APPLE_vertex_array_object to work around
              * a driver bug : the IsVertexArray symbol (without suffix) can be present but unusable.
              */
             SymLoadStruct vaoSymbols[] = {
                 { (PRFuncPtr*) &mSymbols.fIsVertexArray, { "IsVertexArrayAPPLE", nullptr } },
                 { (PRFuncPtr*) &mSymbols.fGenVertexArrays, { "GenVertexArraysAPPLE", nullptr } },
                 { (PRFuncPtr*) &mSymbols.fBindVertexArray, { "BindVertexArrayAPPLE", nullptr } },
                 { (PRFuncPtr*) &mSymbols.fDeleteVertexArrays, { "DeleteVertexArraysAPPLE", nullptr } },
                 { nullptr, { nullptr } },
             };
             if (!LoadSymbols(&vaoSymbols[0], trygl, prefix)) {
                 NS_ERROR("GL supports Vertex Array Object without supplying its functions.");
                 MarkUnsupported(GLFeature::vertex_array_object);
                 mSymbols.fIsVertexArray = nullptr;
                 mSymbols.fGenVertexArrays = nullptr;
                 mSymbols.fBindVertexArray = nullptr;
                 mSymbols.fDeleteVertexArrays = nullptr;
             }
         }
         if (IsSupported(GLFeature::draw_instanced)) {
             SymLoadStruct drawInstancedSymbols[] = {
                 { (PRFuncPtr*) &mSymbols.fDrawArraysInstanced,
                   { "DrawArraysInstanced",
                     "DrawArraysInstancedARB",
                     "DrawArraysInstancedEXT",
                     "DrawArraysInstancedNV",
                     "DrawArraysInstancedANGLE",
                     nullptr
                   }
                 },
                 { (PRFuncPtr*) &mSymbols.fDrawElementsInstanced,
                   { "DrawElementsInstanced",
                     "DrawElementsInstancedARB",
                     "DrawElementsInstancedEXT",
                     "DrawElementsInstancedNV",
                     "DrawElementsInstancedANGLE",
                     nullptr
                   }
                 },
                 { nullptr, { nullptr } },
             };
             if (!LoadSymbols(drawInstancedSymbols, trygl, prefix)) {
                 NS_ERROR("GL supports instanced draws without supplying its functions.");
                 MarkUnsupported(GLFeature::draw_instanced);
                 mSymbols.fDrawArraysInstanced = nullptr;
                 mSymbols.fDrawElementsInstanced = nullptr;
             }
         }
         if (IsSupported(GLFeature::instanced_arrays)) {
             SymLoadStruct instancedArraySymbols[] = {
                 { (PRFuncPtr*) &mSymbols.fVertexAttribDivisor,
                   { "VertexAttribDivisor",
                     "VertexAttribDivisorARB",
                     "VertexAttribDivisorNV",
                     "VertexAttribDivisorANGLE",
                     nullptr
                   }
                 },
                 { nullptr, { nullptr } },
             };
             if (!LoadSymbols(instancedArraySymbols, trygl, prefix)) {
                 NS_ERROR("GL supports array instanced without supplying it function.");
                 MarkUnsupported(GLFeature::instanced_arrays);
                 mSymbols.fVertexAttribDivisor = nullptr;
             }
         }
         if (IsSupported(GLFeature::transform_feedback)) {
             SymLoadStruct transformFeedbackSymbols[] = {
                 { (PRFuncPtr*) &mSymbols.fBindBufferBase,
                   { "BindBufferBase",
                     "BindBufferBaseEXT",
                     "BindBufferBaseNV",
                     nullptr
                   }
                 },
                 { (PRFuncPtr*) &mSymbols.fBindBufferRange,
                   { "BindBufferRange",
                     "BindBufferRangeEXT",
                     "BindBufferRangeNV",
                     nullptr
                   }
                 },
                 { (PRFuncPtr*) &mSymbols.fBeginTransformFeedback,
                   { "BeginTransformFeedback",
                     "BeginTransformFeedbackEXT",
                     "BeginTransformFeedbackNV",
                     nullptr
                   }
                 },
                 { (PRFuncPtr*) &mSymbols.fEndTransformFeedback,
                   { "EndTransformFeedback",
                     "EndTransformFeedbackEXT",
                     "EndTransformFeedbackNV",
                     nullptr
                   }
                 },
                 { (PRFuncPtr*) &mSymbols.fTransformFeedbackVaryings,
                   { "TransformFeedbackVaryings",
                     "TransformFeedbackVaryingsEXT",
                     "TransformFeedbackVaryingsNV",
                     nullptr
                   }
                 },
                 { (PRFuncPtr*) &mSymbols.fGetTransformFeedbackVarying,
                   { "GetTransformFeedbackVarying",
                     "GetTransformFeedbackVaryingEXT",
                     "GetTransformFeedbackVaryingNV",
                     nullptr
                   }
                 },
                 { (PRFuncPtr*) &mSymbols.fGetIntegeri_v,
                   { "GetIntegeri_v",
                     "GetIntegerIndexedvEXT",
                     "GetIntegerIndexedvNV",
                     nullptr
                   }
                 },
                 { nullptr, { nullptr } },
             };
             if (!LoadSymbols(transformFeedbackSymbols, trygl, prefix)) {
                 NS_ERROR("GL supports transform feedback without supplying its functions.");
                 MarkUnsupported(GLFeature::transform_feedback);
                 MarkUnsupported(GLFeature::bind_buffer_offset);
                 mSymbols.fBindBufferBase = nullptr;
                 mSymbols.fBindBufferRange = nullptr;
                 mSymbols.fBeginTransformFeedback = nullptr;
                 mSymbols.fEndTransformFeedback = nullptr;
                 mSymbols.fTransformFeedbackVaryings = nullptr;
                 mSymbols.fGetTransformFeedbackVarying = nullptr;
                 mSymbols.fGetIntegeri_v = nullptr;
             }
         }
         if (IsSupported(GLFeature::bind_buffer_offset)) {
             SymLoadStruct bindBufferOffsetSymbols[] = {
                 { (PRFuncPtr*) &mSymbols.fBindBufferOffset,
                   { "BindBufferOffset",
                     "BindBufferOffsetEXT",
                     "BindBufferOffsetNV",
                     nullptr
                   }
                 },
                 { nullptr, { nullptr } },
             };
             if (!LoadSymbols(bindBufferOffsetSymbols, trygl, prefix)) {
                 NS_ERROR("GL supports BindBufferOffset without supplying its function.");
                 MarkUnsupported(GLFeature::bind_buffer_offset);
                 mSymbols.fBindBufferOffset = nullptr;
             }
         }
         if (IsSupported(GLFeature::query_objects)) {
             SymLoadStruct queryObjectsSymbols[] = {
                 { (PRFuncPtr*) &mSymbols.fBeginQuery, { "BeginQuery", "BeginQueryEXT", nullptr } },
                 { (PRFuncPtr*) &mSymbols.fGenQueries, { "GenQueries", "GenQueriesEXT", nullptr } },
                 { (PRFuncPtr*) &mSymbols.fDeleteQueries, { "DeleteQueries", "DeleteQueriesEXT", nullptr } },
                 { (PRFuncPtr*) &mSymbols.fEndQuery, { "EndQuery", "EndQueryEXT", nullptr } },
                 { (PRFuncPtr*) &mSymbols.fGetQueryiv, { "GetQueryiv", "GetQueryivEXT", nullptr } },
                 { (PRFuncPtr*) &mSymbols.fGetQueryObjectuiv, { "GetQueryObjectuiv", "GetQueryObjectuivEXT", nullptr } },
                 { (PRFuncPtr*) &mSymbols.fIsQuery, { "IsQuery", "IsQueryEXT", nullptr } },
                 { nullptr, { nullptr } },
             };
             if (!LoadSymbols(queryObjectsSymbols, trygl, prefix)) {
                 NS_ERROR("GL supports query objects without supplying its functions.");
                 MarkUnsupported(GLFeature::query_objects);
                 MarkUnsupported(GLFeature::get_query_object_iv);
                 MarkUnsupported(GLFeature::occlusion_query);
                 MarkUnsupported(GLFeature::occlusion_query_boolean);
                 MarkUnsupported(GLFeature::occlusion_query2);
                 mSymbols.fBeginQuery = nullptr;
                 mSymbols.fGenQueries = nullptr;
                 mSymbols.fDeleteQueries = nullptr;
                 mSymbols.fEndQuery = nullptr;
                 mSymbols.fGetQueryiv = nullptr;
                 mSymbols.fGetQueryObjectuiv = nullptr;
                 mSymbols.fIsQuery = nullptr;
             }
         }
         if (IsSupported(GLFeature::get_query_object_iv)) {
             SymLoadStruct queryObjectsSymbols[] = {
                 { (PRFuncPtr*) &mSymbols.fGetQueryObjectiv, { "GetQueryObjectiv", "GetQueryObjectivEXT", nullptr } },
                 { nullptr, { nullptr } },
             };
             if (!LoadSymbols(queryObjectsSymbols, trygl, prefix)) {
                 NS_ERROR("GL supports query objects iv getter without supplying its function.");
                 MarkUnsupported(GLFeature::get_query_object_iv);
                 mSymbols.fGetQueryObjectiv = nullptr;
             }
         }
         if (IsSupported(GLFeature::draw_buffers)) {
             SymLoadStruct drawBuffersSymbols[] = {
                 { (PRFuncPtr*) &mSymbols.fDrawBuffers, { "DrawBuffers", nullptr } },
                 { nullptr, { nullptr } },
             };
             if (!LoadSymbols(drawBuffersSymbols, trygl, prefix)) {
                 NS_ERROR("GL supports draw_buffers without supplying its functions.");
                 MarkUnsupported(GLFeature::draw_buffers);
                 mSymbols.fDrawBuffers = nullptr;
             }
         }
         if (IsExtensionSupported(KHR_debug)) {
             SymLoadStruct extSymbols[] = {
                 { (PRFuncPtr*) &mSymbols.fDebugMessageControl,  { "DebugMessageControl",  "DebugMessageControlKHR",  nullptr } },
                 { (PRFuncPtr*) &mSymbols.fDebugMessageInsert,   { "DebugMessageInsert",   "DebugMessageInsertKHR",   nullptr } },
                 { (PRFuncPtr*) &mSymbols.fDebugMessageCallback, { "DebugMessageCallback", "DebugMessageCallbackKHR", nullptr } },
                 { (PRFuncPtr*) &mSymbols.fGetDebugMessageLog,   { "GetDebugMessageLog",   "GetDebugMessageLogKHR",   nullptr } },
                 { (PRFuncPtr*) &mSymbols.fGetPointerv,          { "GetPointerv",          "GetPointervKHR",          nullptr } },
                 { (PRFuncPtr*) &mSymbols.fPushDebugGroup,       { "PushDebugGroup",       "PushDebugGroupKHR",       nullptr } },
                 { (PRFuncPtr*) &mSymbols.fPopDebugGroup,        { "PopDebugGroup",        "PopDebugGroupKHR",        nullptr } },
                 { (PRFuncPtr*) &mSymbols.fObjectLabel,          { "ObjectLabel",          "ObjectLabelKHR",          nullptr } },
                 { (PRFuncPtr*) &mSymbols.fGetObjectLabel,       { "GetObjectLabel",       "GetObjectLabelKHR",       nullptr } },
                 { (PRFuncPtr*) &mSymbols.fObjectPtrLabel,       { "ObjectPtrLabel",       "ObjectPtrLabelKHR",       nullptr } },
                 { (PRFuncPtr*) &mSymbols.fGetObjectPtrLabel,    { "GetObjectPtrLabel",    "GetObjectPtrLabelKHR",    nullptr } },
                 { nullptr, { nullptr } },
             };
             if (!LoadSymbols(&extSymbols[0], trygl, prefix)) {
                 NS_ERROR("GL supports KHR_debug without supplying its functions.");
                 MarkExtensionUnsupported(KHR_debug);
                 mSymbols.fDebugMessageControl  = nullptr;
                 mSymbols.fDebugMessageInsert   = nullptr;
                 mSymbols.fDebugMessageCallback = nullptr;
                 mSymbols.fGetDebugMessageLog   = nullptr;
                 mSymbols.fGetPointerv          = nullptr;
                 mSymbols.fPushDebugGroup       = nullptr;
                 mSymbols.fPopDebugGroup        = nullptr;
                 mSymbols.fObjectLabel          = nullptr;
                 mSymbols.fGetObjectLabel       = nullptr;
                 mSymbols.fObjectPtrLabel       = nullptr;
                 mSymbols.fGetObjectPtrLabel    = nullptr;
             }
         }
         if (IsSupported(GLFeature::draw_range_elements)) {
             SymLoadStruct imageSymbols[] = {
                 { (PRFuncPtr*) &mSymbols.fDrawRangeElements, { "DrawRangeElementsEXT", "DrawRangeElements", nullptr } },
                 { nullptr, { nullptr } },
             };
             if (!LoadSymbols(&imageSymbols[0], trygl, prefix)) {
                 NS_ERROR("GL supports draw_range_elements without supplying its functions.");
                 MarkUnsupported(GLFeature::draw_range_elements);
                 mSymbols.fDrawRangeElements = nullptr;
             }
         }
         // Load developer symbols, don't fail if we can't find them.
         SymLoadStruct auxSymbols[] = {
                 { (PRFuncPtr*) &mSymbols.fGetTexImage, { "GetTexImage", nullptr } },
                 { (PRFuncPtr*) &mSymbols.fGetTexLevelParameteriv, { "GetTexLevelParameteriv", nullptr } },
                 { nullptr, { nullptr } },
         };
         bool warnOnFailures = DebugMode();
         LoadSymbols(&auxSymbols[0], trygl, prefix, warnOnFailures);
     }
     if (mInitialized) {
         raw_fGetIntegerv(LOCAL_GL_VIEWPORT, mViewportRect);
         raw_fGetIntegerv(LOCAL_GL_SCISSOR_BOX, mScissorRect);
         raw_fGetIntegerv(LOCAL_GL_MAX_TEXTURE_SIZE, &mMaxTextureSize);
         raw_fGetIntegerv(LOCAL_GL_MAX_CUBE_MAP_TEXTURE_SIZE, &mMaxCubeMapTextureSize);
         raw_fGetIntegerv(LOCAL_GL_MAX_RENDERBUFFER_SIZE, &mMaxRenderbufferSize);
 #ifdef XP_MACOSX
         if (mWorkAroundDriverBugs) {
             if (mVendor == GLVendor::Intel) {
                 // see bug 737182 for 2D textures, bug 684882 for cube map textures.
                 mMaxTextureSize        = std::min(mMaxTextureSize,        4096);
                 mMaxCubeMapTextureSize = std::min(mMaxCubeMapTextureSize, 512);
                 // for good measure, we align renderbuffers on what we do for 2D textures
                 mMaxRenderbufferSize   = std::min(mMaxRenderbufferSize,   4096);
                 mNeedsTextureSizeChecks = true;
             } else if (mVendor == GLVendor::NVIDIA) {
                 if (nsCocoaFeatures::OnMountainLionOrLater()) {
                     // See bug 879656.  8192 fails, 8191 works.
                     mMaxTextureSize = std::min(mMaxTextureSize, 8191);
                     mMaxRenderbufferSize = std::min(mMaxRenderbufferSize, 8191);
                 }
                 else {
                     // See bug 877949.
                     mMaxTextureSize = std::min(mMaxTextureSize, 4096);
                     mMaxRenderbufferSize = std::min(mMaxRenderbufferSize, 4096);
                 }
                 // Part of the bug 879656, but it also doesn't hurt the 877949
                 mNeedsTextureSizeChecks = true;
             }
         }
 #endif
 #ifdef MOZ_X11
         if (mWorkAroundDriverBugs &&
             mVendor == GLVendor::Nouveau) {
             // see bug 814716. Clamp MaxCubeMapTextureSize at 2K for Nouveau.
             mMaxCubeMapTextureSize = std::min(mMaxCubeMapTextureSize, 2048);
             mNeedsTextureSizeChecks = true;
         }
 #endif
         mMaxTextureImageSize = mMaxTextureSize;
         mMaxSamples = 0;
         if (IsSupported(GLFeature::framebuffer_multisample)) {
             fGetIntegerv(LOCAL_GL_MAX_SAMPLES, (GLint*)&mMaxSamples);
         }
         // We're ready for final setup.
         fBindFramebuffer(LOCAL_GL_FRAMEBUFFER, 0);
         if (mCaps.any)
             DetermineCaps();
         UpdatePixelFormat();
         UpdateGLFormats(mCaps);
         mTexGarbageBin = new TextureGarbageBin(this);
         MOZ_ASSERT(IsCurrent());
     }
     if (mInitialized)
         reporter.SetSuccessful();
     else {
         // if initialization fails, ensure all symbols are zero, to avoid hard-to-understand bugs
         mSymbols.Zero();
         NS_WARNING("InitWithPrefix failed!");
     }
     mVersionString = nsPrintfCString("%u.%u.%u", mVersion / 100, (mVersion / 10) % 10, mVersion % 10);
     return mInitialized;
 }
 void
 GLContext::InitExtensions()
 {
     MakeCurrent();
     const char* extensions = (const char*)fGetString(LOCAL_GL_EXTENSIONS);
     if (!extensions)
         return;
 #ifdef DEBUG
     static bool firstRun = true;
 #else
     // Non-DEBUG, so never spew.
     const bool firstRun = false;
 #endif
     InitializeExtensionsBitSet(mAvailableExtensions, extensions, sExtensionNames, firstRun && DebugMode());
     if (WorkAroundDriverBugs() &&
         Vendor() == GLVendor::Qualcomm) {
         // Some Adreno drivers do not report GL_OES_EGL_sync, but they really do support it.
         MarkExtensionSupported(OES_EGL_sync);
     }
     if (WorkAroundDriverBugs() &&
         Renderer() == GLRenderer::AndroidEmulator) {
         // the Android emulator, which we use to run B2G reftests on,
         // doesn't expose the OES_rgb8_rgba8 extension, but it seems to
         // support it (tautologically, as it only runs on desktop GL).
         MarkExtensionSupported(OES_rgb8_rgba8);
     }
     if (WorkAroundDriverBugs() &&
         Vendor() == GLVendor::VMware &&
         Renderer() == GLRenderer::GalliumLlvmpipe)
     {
         // The llvmpipe driver that is used on linux try servers appears to have
         // buggy support for s3tc/dxt1 compressed textures.
         // See Bug 975824.
         MarkExtensionUnsupported(EXT_texture_compression_s3tc);
         MarkExtensionUnsupported(EXT_texture_compression_dxt1);
         MarkExtensionUnsupported(ANGLE_texture_compression_dxt3);
         MarkExtensionUnsupported(ANGLE_texture_compression_dxt5);
     }
 #ifdef DEBUG
     firstRun = false;
 #endif
 }
 void
 GLContext::PlatformStartup()
 {
   RegisterStrongMemoryReporter(new GfxTexturesReporter());
 }
 // Common code for checking for both GL extensions and GLX extensions.
 bool
 GLContext::ListHasExtension(const GLubyte *extensions, const char *extension)
 {
     // fix bug 612572 - we were crashing as we were calling this function with extensions==null
     if (extensions == nullptr || extension == nullptr)
         return false;
     const GLubyte *start;
     GLubyte *where, *terminator;
     /* Extension names should not have spaces. */
     where = (GLubyte *) strchr(extension, ' ');
     if (where || *extension == '\0')
         return false;
     /*
      * It takes a bit of care to be fool-proof about parsing the
      * OpenGL extensions string. Don't be fooled by sub-strings,
      * etc.
      */
     start = extensions;
     for (;;) {
         where = (GLubyte *) strstr((const char *) start, extension);
         if (!where) {
             break;
         }
         terminator = where + strlen(extension);
         if (where == start || *(where - 1) == ' ') {
             if (*terminator == ' ' || *terminator == '\0') {
                 return true;
             }
         }
         start = terminator;
     }
     return false;
 }
 void
 GLContext::DetermineCaps()
 {
     PixelBufferFormat format = QueryPixelFormat();
     SurfaceCaps caps;
     caps.color = !!format.red && !!format.green && !!format.blue;
     caps.bpp16 = caps.color && format.ColorBits() == 16;
     caps.alpha = !!format.alpha;
     caps.depth = !!format.depth;
     caps.stencil = !!format.stencil;
     caps.antialias = format.samples > 1;
     caps.preserve = true;
     mCaps = caps;
 }
 PixelBufferFormat
 GLContext::QueryPixelFormat()
 {
     PixelBufferFormat format;
     ScopedBindFramebuffer autoFB(this, 0);
     fGetIntegerv(LOCAL_GL_RED_BITS  , &format.red  );
     fGetIntegerv(LOCAL_GL_GREEN_BITS, &format.green);
     fGetIntegerv(LOCAL_GL_BLUE_BITS , &format.blue );
     fGetIntegerv(LOCAL_GL_ALPHA_BITS, &format.alpha);
     fGetIntegerv(LOCAL_GL_DEPTH_BITS, &format.depth);
     fGetIntegerv(LOCAL_GL_STENCIL_BITS, &format.stencil);
     fGetIntegerv(LOCAL_GL_SAMPLES, &format.samples);
     return format;
 }
 void
 GLContext::UpdatePixelFormat()
 {
     PixelBufferFormat format = QueryPixelFormat();
 #ifdef DEBUG
     const SurfaceCaps& caps = Caps();
     MOZ_ASSERT(!caps.any, "Did you forget to DetermineCaps()?");
     MOZ_ASSERT(caps.color == !!format.red);
     MOZ_ASSERT(caps.color == !!format.green);
     MOZ_ASSERT(caps.color == !!format.blue);
     MOZ_ASSERT(caps.alpha == !!format.alpha);
     // These we either must have if they're requested, or
     // we can have if they're not.
     MOZ_ASSERT(caps.depth == !!format.depth || !caps.depth);
     MOZ_ASSERT(caps.stencil == !!format.stencil || !caps.stencil);
     MOZ_ASSERT(caps.antialias == (format.samples > 1));
 #endif
     mPixelFormat = new PixelBufferFormat(format);
 }
 GLFormats
 GLContext::ChooseGLFormats(const SurfaceCaps& caps) const
 {
     GLFormats formats;
     // If we're on ES2 hardware and we have an explicit request for 16 bits of color or less
     // OR we don't support full 8-bit color, return a 4444 or 565 format.
     bool bpp16 = caps.bpp16;
     if (IsGLES()) {
         if (!IsExtensionSupported(OES_rgb8_rgba8))
             bpp16 = true;
     } else {
         // RGB565 is uncommon on desktop, requiring ARB_ES2_compatibility.
         // Since it's also vanishingly useless there, let's not support it.
         bpp16 = false;
     }
     if (bpp16) {
         MOZ_ASSERT(IsGLES());
         if (caps.alpha) {
             formats.color_texInternalFormat = LOCAL_GL_RGBA;
             formats.color_texFormat = LOCAL_GL_RGBA;
             formats.color_texType   = LOCAL_GL_UNSIGNED_SHORT_4_4_4_4;
             formats.color_rbFormat  = LOCAL_GL_RGBA4;
         } else {
             formats.color_texInternalFormat = LOCAL_GL_RGB;
             formats.color_texFormat = LOCAL_GL_RGB;
             formats.color_texType   = LOCAL_GL_UNSIGNED_SHORT_5_6_5;
             formats.color_rbFormat  = LOCAL_GL_RGB565;
         }
     } else {
         formats.color_texType = LOCAL_GL_UNSIGNED_BYTE;
         if (caps.alpha) {
             formats.color_texInternalFormat = IsGLES() ? LOCAL_GL_RGBA : LOCAL_GL_RGBA8;
             formats.color_texFormat = LOCAL_GL_RGBA;
             formats.color_rbFormat  = LOCAL_GL_RGBA8;
         } else {
             formats.color_texInternalFormat = IsGLES() ? LOCAL_GL_RGB : LOCAL_GL_RGB8;
             formats.color_texFormat = LOCAL_GL_RGB;
             formats.color_rbFormat  = LOCAL_GL_RGB8;
         }
     }
     uint32_t msaaLevel = gfxPrefs::MSAALevel();
     GLsizei samples = msaaLevel * msaaLevel;
     samples = std::min(samples, mMaxSamples);
     // Bug 778765.
     if (WorkAroundDriverBugs() && samples == 1) {
         samples = 0;
     }
     formats.samples = samples;
     // Be clear that these are 0 if unavailable.
     formats.depthStencil = 0;
     if (!IsGLES() || IsExtensionSupported(OES_packed_depth_stencil)) {
         formats.depthStencil = LOCAL_GL_DEPTH24_STENCIL8;
     }
     formats.depth = 0;
     if (IsGLES()) {
         if (IsExtensionSupported(OES_depth24)) {
             formats.depth = LOCAL_GL_DEPTH_COMPONENT24;
         } else {
             formats.depth = LOCAL_GL_DEPTH_COMPONENT16;
         }
     } else {
         formats.depth = LOCAL_GL_DEPTH_COMPONENT24;
     }
     formats.stencil = LOCAL_GL_STENCIL_INDEX8;
     return formats;
 }
 bool
 GLContext::IsFramebufferComplete(GLuint fb, GLenum* pStatus)
 {
     MOZ_ASSERT(fb);
     ScopedBindFramebuffer autoFB(this, fb);
     MOZ_ASSERT(fIsFramebuffer(fb));
     GLenum status = fCheckFramebufferStatus(LOCAL_GL_FRAMEBUFFER);
     if (pStatus)
         *pStatus = status;
     return status == LOCAL_GL_FRAMEBUFFER_COMPLETE;
 }
 void
 GLContext::AttachBuffersToFB(GLuint colorTex, GLuint colorRB,
                              GLuint depthRB, GLuint stencilRB,
                              GLuint fb, GLenum target)
 {
     MOZ_ASSERT(fb);
     MOZ_ASSERT( !(colorTex && colorRB) );
     ScopedBindFramebuffer autoFB(this, fb);
     MOZ_ASSERT(fIsFramebuffer(fb)); // It only counts after being bound.
     if (colorTex) {
         MOZ_ASSERT(fIsTexture(colorTex));
         MOZ_ASSERT(target == LOCAL_GL_TEXTURE_2D ||
                    target == LOCAL_GL_TEXTURE_RECTANGLE_ARB);
         fFramebufferTexture2D(LOCAL_GL_FRAMEBUFFER,
                               LOCAL_GL_COLOR_ATTACHMENT0,
                               target,
                               colorTex,
 );
     } else if (colorRB) {
         MOZ_ASSERT(fIsRenderbuffer(colorRB));
         fFramebufferRenderbuffer(LOCAL_GL_FRAMEBUFFER,
                                  LOCAL_GL_COLOR_ATTACHMENT0,
                                  LOCAL_GL_RENDERBUFFER,
                                  colorRB);
     }
     if (depthRB) {
         MOZ_ASSERT(fIsRenderbuffer(depthRB));
         fFramebufferRenderbuffer(LOCAL_GL_FRAMEBUFFER,
                                  LOCAL_GL_DEPTH_ATTACHMENT,
                                  LOCAL_GL_RENDERBUFFER,
                                  depthRB);
     }
     if (stencilRB) {
         MOZ_ASSERT(fIsRenderbuffer(stencilRB));
         fFramebufferRenderbuffer(LOCAL_GL_FRAMEBUFFER,
                                  LOCAL_GL_STENCIL_ATTACHMENT,
                                  LOCAL_GL_RENDERBUFFER,
                                  stencilRB);
     }
 }
 bool
 GLContext::AssembleOffscreenFBs(const GLuint colorMSRB,
                                 const GLuint depthRB,
                                 const GLuint stencilRB,
                                 const GLuint texture,
                                 GLuint* drawFB_out,
                                 GLuint* readFB_out)
 {
     if (!colorMSRB && !texture) {
         MOZ_ASSERT(!depthRB && !stencilRB);
         if (drawFB_out)
             *drawFB_out = 0;
         if (readFB_out)
             *readFB_out = 0;
         return true;
     }
     ScopedBindFramebuffer autoFB(this);
     GLuint drawFB = 0;
     GLuint readFB = 0;
     if (texture) {
         readFB = 0;
         fGenFramebuffers(1, &readFB);
         BindFB(readFB);
         fFramebufferTexture2D(LOCAL_GL_FRAMEBUFFER,
                               LOCAL_GL_COLOR_ATTACHMENT0,
                               LOCAL_GL_TEXTURE_2D,
                               texture,
 );
     }
     if (colorMSRB) {
         drawFB = 0;
         fGenFramebuffers(1, &drawFB);
         BindFB(drawFB);
         fFramebufferRenderbuffer(LOCAL_GL_FRAMEBUFFER,
                                  LOCAL_GL_COLOR_ATTACHMENT0,
                                  LOCAL_GL_RENDERBUFFER,
                                  colorMSRB);
     } else {
         drawFB = readFB;
     }
     MOZ_ASSERT(GetFB() == drawFB);
     if (depthRB) {
         fFramebufferRenderbuffer(LOCAL_GL_FRAMEBUFFER,
                                  LOCAL_GL_DEPTH_ATTACHMENT,
                                  LOCAL_GL_RENDERBUFFER,
                                  depthRB);
     }
     if (stencilRB) {
         fFramebufferRenderbuffer(LOCAL_GL_FRAMEBUFFER,
                                  LOCAL_GL_STENCIL_ATTACHMENT,
                                  LOCAL_GL_RENDERBUFFER,
                                  stencilRB);
     }
     // We should be all resized.  Check for framebuffer completeness.
     GLenum status;
     bool isComplete = true;
     if (!IsFramebufferComplete(drawFB, &status)) {
         NS_WARNING("DrawFBO: Incomplete");
   #ifdef DEBUG
         if (DebugMode()) {
             printf_stderr("Framebuffer status: %X\n", status);
         }
   #endif
         isComplete = false;
     }
     if (!IsFramebufferComplete(readFB, &status)) {
         NS_WARNING("ReadFBO: Incomplete");
   #ifdef DEBUG
         if (DebugMode()) {
             printf_stderr("Framebuffer status: %X\n", status);
         }
   #endif
         isComplete = false;
     }
     if (drawFB_out) {
         *drawFB_out = drawFB;
     } else if (drawFB) {
         NS_RUNTIMEABORT("drawFB created when not requested!");
     }
     if (readFB_out) {
         *readFB_out = readFB;
     } else if (readFB) {
         NS_RUNTIMEABORT("readFB created when not requested!");
     }
     return isComplete;
 }
 bool
 GLContext::PublishFrame()
 {
     MOZ_ASSERT(mScreen);
     if (!mScreen->PublishFrame(OffscreenSize()))
         return false;
     return true;
 }
 SharedSurface_GL*
 GLContext::RequestFrame()
 {
     MOZ_ASSERT(mScreen);
     SharedSurface* ret = mScreen->Stream()->SwapConsumer();
     if (!ret)
         return nullptr;
     return SharedSurface_GL::Cast(ret);
 }
 void
 GLContext::ClearSafely()
 {
     // bug 659349 --- we must be very careful here: clearing a GL framebuffer is nontrivial, relies on a lot of state,
     // and in the case of the backbuffer of a WebGL context, state is exposed to scripts.
     //
     // The code here is taken from WebGLContext::ForceClearFramebufferWithDefaultValues, but I didn't find a good way of
     // sharing code with it. WebGL's code is somewhat performance-critical as it is typically called on every frame, so
     // WebGL keeps track of GL state to avoid having to query it everytime, and also tries to only do work for actually
     // present buffers (e.g. stencil buffer). Doing that here seems like premature optimization,
     // as ClearSafely() is called only when e.g. a canvas is resized, not on every animation frame.
     realGLboolean scissorTestEnabled;
     realGLboolean ditherEnabled;
     realGLboolean colorWriteMask[4];
     realGLboolean depthWriteMask;
     GLint stencilWriteMaskFront, stencilWriteMaskBack;
     GLfloat colorClearValue[4];
     GLfloat depthClearValue;
     GLint stencilClearValue;
     // save current GL state
     fGetBooleanv(LOCAL_GL_SCISSOR_TEST, &scissorTestEnabled);
     fGetBooleanv(LOCAL_GL_DITHER, &ditherEnabled);
     fGetBooleanv(LOCAL_GL_COLOR_WRITEMASK, colorWriteMask);
     fGetBooleanv(LOCAL_GL_DEPTH_WRITEMASK, &depthWriteMask);
     fGetIntegerv(LOCAL_GL_STENCIL_WRITEMASK, &stencilWriteMaskFront);
     fGetIntegerv(LOCAL_GL_STENCIL_BACK_WRITEMASK, &stencilWriteMaskBack);
     fGetFloatv(LOCAL_GL_COLOR_CLEAR_VALUE, colorClearValue);
     fGetFloatv(LOCAL_GL_DEPTH_CLEAR_VALUE, &depthClearValue);
     fGetIntegerv(LOCAL_GL_STENCIL_CLEAR_VALUE, &stencilClearValue);
     // prepare GL state for clearing
     fDisable(LOCAL_GL_SCISSOR_TEST);
     fDisable(LOCAL_GL_DITHER);
     fColorMask(1, 1, 1, 1);
     fClearColor(0.f, 0.f, 0.f, 0.f);
     fDepthMask(1);
     fClearDepth(1.0f);
     fStencilMask(0xffffffff);
     fClearStencil(0);
     // do clear
     fClear(LOCAL_GL_COLOR_BUFFER_BIT |
            LOCAL_GL_DEPTH_BUFFER_BIT |
            LOCAL_GL_STENCIL_BUFFER_BIT);
     // restore GL state after clearing
     fColorMask(colorWriteMask[0],
                colorWriteMask[1],
                colorWriteMask[2],
                colorWriteMask[3]);
     fClearColor(colorClearValue[0],
                 colorClearValue[1],
                 colorClearValue[2],
                 colorClearValue[3]);
     fDepthMask(depthWriteMask);
     fClearDepth(depthClearValue);
     fStencilMaskSeparate(LOCAL_GL_FRONT, stencilWriteMaskFront);
     fStencilMaskSeparate(LOCAL_GL_BACK, stencilWriteMaskBack);
     fClearStencil(stencilClearValue);
     if (ditherEnabled)
         fEnable(LOCAL_GL_DITHER);
     else
         fDisable(LOCAL_GL_DITHER);
     if (scissorTestEnabled)
         fEnable(LOCAL_GL_SCISSOR_TEST);
     else
         fDisable(LOCAL_GL_SCISSOR_TEST);
 }
 void
 GLContext::MarkDestroyed()
 {
     if (IsDestroyed())
         return;
     if (MakeCurrent()) {
         DestroyScreenBuffer();
         mBlitHelper = nullptr;
         mBlitTextureImageHelper = nullptr;
         mReadTexImageHelper = nullptr;
         mTexGarbageBin->GLContextTeardown();
     } else {
         NS_WARNING("MakeCurrent() failed during MarkDestroyed! Skipping GL object teardown.");
     }
     mSymbols.Zero();
 }
 #ifdef MOZ_ENABLE_GL_TRACKING
 void
 GLContext::CreatedProgram(GLContext *aOrigin, GLuint aName)
 {
     mTrackedPrograms.AppendElement(NamedResource(aOrigin, aName));
 }
 void
 GLContext::CreatedShader(GLContext *aOrigin, GLuint aName)
 {
     mTrackedShaders.AppendElement(NamedResource(aOrigin, aName));
 }
 void
 GLContext::CreatedBuffers(GLContext *aOrigin, GLsizei aCount, GLuint *aNames)
 {
     for (GLsizei i = 0; i < aCount; ++i) {
         mTrackedBuffers.AppendElement(NamedResource(aOrigin, aNames[i]));
     }
 }
 void
 GLContext::CreatedQueries(GLContext *aOrigin, GLsizei aCount, GLuint *aNames)
 {
     for (GLsizei i = 0; i < aCount; ++i) {
         mTrackedQueries.AppendElement(NamedResource(aOrigin, aNames[i]));
     }
 }
 void
 GLContext::CreatedTextures(GLContext *aOrigin, GLsizei aCount, GLuint *aNames)
 {
     for (GLsizei i = 0; i < aCount; ++i) {
         mTrackedTextures.AppendElement(NamedResource(aOrigin, aNames[i]));
     }
 }
 void
 GLContext::CreatedFramebuffers(GLContext *aOrigin, GLsizei aCount, GLuint *aNames)
 {
     for (GLsizei i = 0; i < aCount; ++i) {
         mTrackedFramebuffers.AppendElement(NamedResource(aOrigin, aNames[i]));
     }
 }
 void
 GLContext::CreatedRenderbuffers(GLContext *aOrigin, GLsizei aCount, GLuint *aNames)
 {
     for (GLsizei i = 0; i < aCount; ++i) {
         mTrackedRenderbuffers.AppendElement(NamedResource(aOrigin, aNames[i]));
     }
 }
 static void
 RemoveNamesFromArray(GLContext *aOrigin, GLsizei aCount, const GLuint *aNames, nsTArray<GLContext::NamedResource>& aArray)
 {
     for (GLsizei j = 0; j < aCount; ++j) {
         GLuint name = aNames[j];
         // name 0 can be ignored
         if (name == 0)
             continue;
         for (uint32_t i = 0; i < aArray.Length(); ++i) {
             if (aArray[i].name == name) {
                 aArray.RemoveElementAt(i);
                 break;
             }
         }
     }
 }
 void
 GLContext::DeletedProgram(GLContext *aOrigin, GLuint aName)
 {
     RemoveNamesFromArray(aOrigin, 1, &aName, mTrackedPrograms);
 }
 void
 GLContext::DeletedShader(GLContext *aOrigin, GLuint aName)
 {
     RemoveNamesFromArray(aOrigin, 1, &aName, mTrackedShaders);
 }
 void
 GLContext::DeletedBuffers(GLContext *aOrigin, GLsizei aCount, const GLuint *aNames)
 {
     RemoveNamesFromArray(aOrigin, aCount, aNames, mTrackedBuffers);
 }
 void
 GLContext::DeletedQueries(GLContext *aOrigin, GLsizei aCount, const GLuint *aNames)
 {
     RemoveNamesFromArray(aOrigin, aCount, aNames, mTrackedQueries);
 }
 void
 GLContext::DeletedTextures(GLContext *aOrigin, GLsizei aCount, const GLuint *aNames)
 {
     RemoveNamesFromArray(aOrigin, aCount, aNames, mTrackedTextures);
 }
 void
 GLContext::DeletedFramebuffers(GLContext *aOrigin, GLsizei aCount, const GLuint *aNames)
 {
     RemoveNamesFromArray(aOrigin, aCount, aNames, mTrackedFramebuffers);
 }
 void
 GLContext::DeletedRenderbuffers(GLContext *aOrigin, GLsizei aCount, const GLuint *aNames)
 {
     RemoveNamesFromArray(aOrigin, aCount, aNames, mTrackedRenderbuffers);
 }
 static void
 MarkContextDestroyedInArray(GLContext *aContext, nsTArray<GLContext::NamedResource>& aArray)
 {
     for (uint32_t i = 0; i < aArray.Length(); ++i) {
         if (aArray[i].origin == aContext)
             aArray[i].originDeleted = true;
     }
 }
 void
 GLContext::SharedContextDestroyed(GLContext *aChild)
 {
     MarkContextDestroyedInArray(aChild, mTrackedPrograms);
     MarkContextDestroyedInArray(aChild, mTrackedShaders);
     MarkContextDestroyedInArray(aChild, mTrackedTextures);
     MarkContextDestroyedInArray(aChild, mTrackedFramebuffers);
     MarkContextDestroyedInArray(aChild, mTrackedRenderbuffers);
     MarkContextDestroyedInArray(aChild, mTrackedBuffers);
     MarkContextDestroyedInArray(aChild, mTrackedQueries);
 }
 static void
 ReportArrayContents(const char *title, const nsTArray<GLContext::NamedResource>& aArray)
 {
     if (aArray.Length() == 0)
         return;
     printf_stderr("%s:\n", title);
     nsTArray<GLContext::NamedResource> copy(aArray);
     copy.Sort();
     GLContext *lastContext = nullptr;
     for (uint32_t i = 0; i < copy.Length(); ++i) {
         if (lastContext != copy[i].origin) {
             if (lastContext)
                 printf_stderr("\n");
             printf_stderr("  [%p - %s] ", copy[i].origin, copy[i].originDeleted ? "deleted" : "live");
             lastContext = copy[i].origin;
         }
         printf_stderr("%d ", copy[i].name);
     }
     printf_stderr("\n");
 }
 void
 GLContext::ReportOutstandingNames()
 {
     if (!DebugMode())
         return;
     printf_stderr("== GLContext %p Outstanding ==\n", this);
     ReportArrayContents("Outstanding Textures", mTrackedTextures);
     ReportArrayContents("Outstanding Buffers", mTrackedBuffers);
     ReportArrayContents("Outstanding Queries", mTrackedQueries);
     ReportArrayContents("Outstanding Programs", mTrackedPrograms);
     ReportArrayContents("Outstanding Shaders", mTrackedShaders);
     ReportArrayContents("Outstanding Framebuffers", mTrackedFramebuffers);
     ReportArrayContents("Outstanding Renderbuffers", mTrackedRenderbuffers);
 }
 #endif /* DEBUG */
 void
 GLContext::GuaranteeResolve()
 {
     if (mScreen) {
         mScreen->AssureBlitted();
     }
     fFinish();
 }
 const gfx::IntSize&
 GLContext::OffscreenSize() const
 {
     MOZ_ASSERT(IsOffscreen());
     return mScreen->Size();
 }
 bool
 GLContext::CreateScreenBufferImpl(const IntSize& size, const SurfaceCaps& caps)
 {
     GLScreenBuffer* newScreen = GLScreenBuffer::Create(this, size, caps);
     if (!newScreen)
         return false;
     if (!newScreen->Resize(size)) {
         delete newScreen;
         return false;
     }
     DestroyScreenBuffer();
     // This will rebind to 0 (Screen) if needed when
     // it falls out of scope.
     ScopedBindFramebuffer autoFB(this);
     mScreen = newScreen;
     return true;
 }
 bool
 GLContext::ResizeScreenBuffer(const IntSize& size)
 {
     if (!IsOffscreenSizeAllowed(size))
         return false;
     return mScreen->Resize(size);
 }
 void
 GLContext::DestroyScreenBuffer()
 {
     delete mScreen;
     mScreen = nullptr;
 }
 void
 GLContext::ForceDirtyScreen()
 {
     ScopedBindFramebuffer autoFB(0);
     BeforeGLDrawCall();
     // no-op; just pretend we did something
     AfterGLDrawCall();
 }
 void
 GLContext::CleanDirtyScreen()
 {
     ScopedBindFramebuffer autoFB(0);
     BeforeGLReadCall();
     // no-op; we just want to make sure the Read FBO is updated if it needs to be
     AfterGLReadCall();
 }
 void
 GLContext::EmptyTexGarbageBin()
 {
    TexGarbageBin()->EmptyGarbage();
 }
 bool
 GLContext::IsOffscreenSizeAllowed(const IntSize& aSize) const {
   int32_t biggerDimension = std::max(aSize.width, aSize.height);
   int32_t maxAllowed = std::min(mMaxRenderbufferSize, mMaxTextureSize);
   return biggerDimension <= maxAllowed;
 }
 bool
 GLContext::IsOwningThreadCurrent()
 {
   return NS_GetCurrentThread() == mOwningThread;
 }
 void
 GLContext::DispatchToOwningThread(nsIRunnable *event)
 {
     // Before dispatching, we need to ensure we're not in the middle of
     // shutting down. Dispatching runnables in the middle of shutdown
     // (that is, when the main thread is no longer get-able) can cause them
     // to leak. See Bug 741319, and Bug 744115.
     nsCOMPtr<nsIThread> mainThread;
     if (NS_SUCCEEDED(NS_GetMainThread(getter_AddRefs(mainThread)))) {
         mOwningThread->Dispatch(event, NS_DISPATCH_NORMAL);
     }
 }
 GLBlitHelper*
 GLContext::BlitHelper()
 {
     if (!mBlitHelper) {
         mBlitHelper = new GLBlitHelper(this);
     }
     return mBlitHelper;
 }
 GLBlitTextureImageHelper*
 GLContext::BlitTextureImageHelper()
 {
     if (!mBlitTextureImageHelper) {
         mBlitTextureImageHelper = new GLBlitTextureImageHelper(this);
     }
     return mBlitTextureImageHelper;
 }
 GLReadTexImageHelper*
 GLContext::ReadTexImageHelper()
 {
     if (!mReadTexImageHelper) {
         mReadTexImageHelper = new GLReadTexImageHelper(this);
     }
     return mReadTexImageHelper;
 }
 bool
 DoesStringMatch(const char* aString, const char *aWantedString)
 {
     if (!aString || !aWantedString)
         return false;
     const char *occurrence = strstr(aString, aWantedString);
     // aWanted not found
     if (!occurrence)
         return false;
     // aWantedString preceded by alpha character
     if (occurrence != aString && isalpha(*(occurrence-1)))
         return false;
     // aWantedVendor followed by alpha character
     const char *afterOccurrence = occurrence + strlen(aWantedString);
     if (isalpha(*afterOccurrence))
         return false;
     return true;
 }
 } /* namespace gl */
 } /* namespace mozilla */

The Tor Browser / annotate

gfx/gl/GLContext.cpp@97036ab72558 (annotated)

gfx/gl/GLContext.cpp