// Copyright (c) 2012 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#include "gpu/blink/webgraphicscontext3d_impl.h"

#include "base/atomicops.h"
#include "base/lazy_instance.h"
#include "base/logging.h"
#include "gpu/GLES2/gl2extchromium.h"
#include "gpu/command_buffer/client/gles2_implementation.h"
#include "gpu/command_buffer/client/gles2_lib.h"
#include "gpu/command_buffer/common/gles2_cmd_utils.h"
#include "gpu/skia_bindings/gl_bindings_skia_cmd_buffer.h"

#include "third_party/khronos/GLES2/gl2.h"
#ifndef GL_GLEXT_PROTOTYPES
#define GL_GLEXT_PROTOTYPES 1
#endif
#include "third_party/khronos/GLES2/gl2ext.h"

namespace gpu_blink {

namespace {

uint32_t GenFlushID() {
  static base::subtle::Atomic32 flush_id = 0;

  base::subtle::Atomic32 my_id = base::subtle::Barrier_AtomicIncrement(
      &flush_id, 1);
  return static_cast<uint32_t>(my_id);
}

} // namespace anonymous

class WebGraphicsContext3DErrorMessageCallback
    : public ::gpu::gles2::GLES2ImplementationErrorMessageCallback {
 public:
  WebGraphicsContext3DErrorMessageCallback(
      WebGraphicsContext3DImpl* context)
      : graphics_context_(context) {
  }

  void OnErrorMessage(const char* msg, int id) override;

 private:
  WebGraphicsContext3DImpl* graphics_context_;

  DISALLOW_COPY_AND_ASSIGN(WebGraphicsContext3DErrorMessageCallback);
};

void WebGraphicsContext3DErrorMessageCallback::OnErrorMessage(
    const char* msg, int id) {
  graphics_context_->OnErrorMessage(msg, id);
}

// Helper macros to reduce the amount of code.

#define DELEGATE_TO_GL(name, glname)                                    \
void WebGraphicsContext3DImpl::name() {                                 \
  gl_->glname();                                                        \
}

#define DELEGATE_TO_GL_R(name, glname, rt)                              \
rt WebGraphicsContext3DImpl::name() {                                   \
  return gl_->glname();                                                 \
}

#define DELEGATE_TO_GL_1(name, glname, t1)                              \
void WebGraphicsContext3DImpl::name(t1 a1) {                            \
  gl_->glname(a1);                                                      \
}

#define DELEGATE_TO_GL_1R(name, glname, t1, rt)                         \
rt WebGraphicsContext3DImpl::name(t1 a1) {                              \
  return gl_->glname(a1);                                               \
}

#define DELEGATE_TO_GL_1RB(name, glname, t1, rt)                        \
rt WebGraphicsContext3DImpl::name(t1 a1) {                              \
  return gl_->glname(a1) ? true : false;                                \
}

#define DELEGATE_TO_GL_2(name, glname, t1, t2)                          \
void WebGraphicsContext3DImpl::name(t1 a1, t2 a2) {                     \
  gl_->glname(a1, a2);                                                  \
}

#define DELEGATE_TO_GL_2R(name, glname, t1, t2, rt)                     \
rt WebGraphicsContext3DImpl::name(t1 a1, t2 a2) {                       \
  return gl_->glname(a1, a2);                                           \
}

#define DELEGATE_TO_GL_3(name, glname, t1, t2, t3)                      \
void WebGraphicsContext3DImpl::name(t1 a1, t2 a2, t3 a3) {              \
  gl_->glname(a1, a2, a3);                                              \
}

#define DELEGATE_TO_GL_3R(name, glname, t1, t2, t3, rt)                 \
rt WebGraphicsContext3DImpl::name(t1 a1, t2 a2, t3 a3) {                \
  return gl_->glname(a1, a2, a3);                                       \
}

#define DELEGATE_TO_GL_4(name, glname, t1, t2, t3, t4)                  \
void WebGraphicsContext3DImpl::name(t1 a1, t2 a2, t3 a3, t4 a4) {       \
  gl_->glname(a1, a2, a3, a4);                                          \
}

#define DELEGATE_TO_GL_4R(name, glname, t1, t2, t3, t4, rt)             \
rt WebGraphicsContext3DImpl::name(t1 a1, t2 a2, t3 a3, t4 a4) {         \
  return gl_->glname(a1, a2, a3, a4);                                   \
}

#define DELEGATE_TO_GL_5(name, glname, t1, t2, t3, t4, t5)              \
void WebGraphicsContext3DImpl::name(t1 a1, t2 a2, t3 a3, t4 a4, t5 a5) {\
                                                                        \
  gl_->glname(a1, a2, a3, a4, a5);                                      \
}

#define DELEGATE_TO_GL_6(name, glname, t1, t2, t3, t4, t5, t6)          \
void WebGraphicsContext3DImpl::name(t1 a1, t2 a2, t3 a3, t4 a4, t5 a5,  \
                                    t6 a6) {                            \
  gl_->glname(a1, a2, a3, a4, a5, a6);                                  \
}

#define DELEGATE_TO_GL_7(name, glname, t1, t2, t3, t4, t5, t6, t7)      \
void WebGraphicsContext3DImpl::name(t1 a1, t2 a2, t3 a3, t4 a4, t5 a5,  \
                                    t6 a6, t7 a7) {                     \
  gl_->glname(a1, a2, a3, a4, a5, a6, a7);                              \
}

#define DELEGATE_TO_GL_8(name, glname, t1, t2, t3, t4, t5, t6, t7, t8)  \
void WebGraphicsContext3DImpl::name(t1 a1, t2 a2, t3 a3, t4 a4, t5 a5,  \
                                    t6 a6, t7 a7, t8 a8) {              \
  gl_->glname(a1, a2, a3, a4, a5, a6, a7, a8);                          \
}

#define DELEGATE_TO_GL_9(name, glname, t1, t2, t3, t4, t5, t6, t7, t8, t9) \
void WebGraphicsContext3DImpl::name(t1 a1, t2 a2, t3 a3, t4 a4, t5 a5,  \
                                    t6 a6, t7 a7, t8 a8, t9 a9) {       \
  gl_->glname(a1, a2, a3, a4, a5, a6, a7, a8, a9);                      \
}

#define DELEGATE_TO_GL_9R(name, glname, t1, t2, t3, t4, t5, t6, t7, t8, \
                          t9, rt)                                       \
rt WebGraphicsContext3DImpl::name(t1 a1, t2 a2, t3 a3, t4 a4, t5 a5,    \
                                    t6 a6, t7 a7, t8 a8, t9 a9) {       \
  return gl_->glname(a1, a2, a3, a4, a5, a6, a7, a8, a9);               \
}

#define DELEGATE_TO_GL_10(name, glname, t1, t2, t3, t4, t5, t6, t7, t8, \
                          t9, t10)                                      \
void WebGraphicsContext3DImpl::name(t1 a1, t2 a2, t3 a3, t4 a4, t5 a5,  \
                                    t6 a6, t7 a7, t8 a8, t9 a9,         \
                                    t10 a10) {                          \
  gl_->glname(a1, a2, a3, a4, a5, a6, a7, a8, a9, a10);                 \
}

#define DELEGATE_TO_GL_11(name, glname, t1, t2, t3, t4, t5, t6, t7, t8, \
                          t9, t10, t11)                                 \
void WebGraphicsContext3DImpl::name(t1 a1, t2 a2, t3 a3, t4 a4, t5 a5,  \
                                    t6 a6, t7 a7, t8 a8, t9 a9, t10 a10,\
                                    t11 a11) {                          \
  gl_->glname(a1, a2, a3, a4, a5, a6, a7, a8, a9, a10, a11);            \
}

WebGraphicsContext3DImpl::WebGraphicsContext3DImpl()
    : initialized_(false),
      initialize_failed_(false),
      context_lost_callback_(0),
      context_lost_reason_(GL_NO_ERROR),
      error_message_callback_(0),
      gl_(NULL),
      flush_id_(0) {
}

WebGraphicsContext3DImpl::~WebGraphicsContext3DImpl() {

}

void WebGraphicsContext3DImpl::synthesizeGLError(WGC3Denum error) {
  if (std::find(synthetic_errors_.begin(), synthetic_errors_.end(), error) ==
      synthetic_errors_.end()) {
    synthetic_errors_.push_back(error);
  }
}

uint32_t WebGraphicsContext3DImpl::lastFlushID() {
  return flush_id_;
}

DELEGATE_TO_GL_R(insertSyncPoint, InsertSyncPointCHROMIUM, unsigned int)

DELEGATE_TO_GL_3(reshapeWithScaleFactor, ResizeCHROMIUM, int, int, float)

DELEGATE_TO_GL_4R(mapBufferSubDataCHROMIUM, MapBufferSubDataCHROMIUM, WGC3Denum,
                  WGC3Dintptr, WGC3Dsizeiptr, WGC3Denum, void*)

DELEGATE_TO_GL_1(unmapBufferSubDataCHROMIUM, UnmapBufferSubDataCHROMIUM,
                 const void*)

DELEGATE_TO_GL_9R(mapTexSubImage2DCHROMIUM, MapTexSubImage2DCHROMIUM, WGC3Denum,
                  WGC3Dint, WGC3Dint, WGC3Dint, WGC3Dsizei, WGC3Dsizei,
                  WGC3Denum, WGC3Denum, WGC3Denum, void*)

DELEGATE_TO_GL_1(unmapTexSubImage2DCHROMIUM, UnmapTexSubImage2DCHROMIUM,
                 const void*)

DELEGATE_TO_GL_3(discardFramebufferEXT, DiscardFramebufferEXT, WGC3Denum,
                 WGC3Dsizei, const WGC3Denum*)

blink::WebString WebGraphicsContext3DImpl::
    getRequestableExtensionsCHROMIUM() {
  return blink::WebString::fromUTF8(
      gl_->GetRequestableExtensionsCHROMIUM());
}

DELEGATE_TO_GL_1(requestExtensionCHROMIUM, RequestExtensionCHROMIUM,
                 const char*)

void WebGraphicsContext3DImpl::blitFramebufferCHROMIUM(
    WGC3Dint srcX0, WGC3Dint srcY0, WGC3Dint srcX1, WGC3Dint srcY1,
    WGC3Dint dstX0, WGC3Dint dstY0, WGC3Dint dstX1, WGC3Dint dstY1,
    WGC3Dbitfield mask, WGC3Denum filter) {
  gl_->BlitFramebufferCHROMIUM(
      srcX0, srcY0, srcX1, srcY1,
      dstX0, dstY0, dstX1, dstY1,
      mask, filter);
}

DELEGATE_TO_GL_5(renderbufferStorageMultisampleCHROMIUM,
                 RenderbufferStorageMultisampleCHROMIUM, WGC3Denum, WGC3Dsizei,
                 WGC3Denum, WGC3Dsizei, WGC3Dsizei)

DELEGATE_TO_GL_1(activeTexture, ActiveTexture, WGC3Denum)

DELEGATE_TO_GL_2(attachShader, AttachShader, WebGLId, WebGLId)

DELEGATE_TO_GL_3(bindAttribLocation, BindAttribLocation, WebGLId,
                 WGC3Duint, const WGC3Dchar*)

DELEGATE_TO_GL_2(bindBuffer, BindBuffer, WGC3Denum, WebGLId)

DELEGATE_TO_GL_2(bindFramebuffer, BindFramebuffer, WGC3Denum, WebGLId)

DELEGATE_TO_GL_2(bindRenderbuffer, BindRenderbuffer, WGC3Denum, WebGLId)

DELEGATE_TO_GL_2(bindTexture, BindTexture, WGC3Denum, WebGLId)

DELEGATE_TO_GL_4(blendColor, BlendColor,
                 WGC3Dclampf, WGC3Dclampf, WGC3Dclampf, WGC3Dclampf)

DELEGATE_TO_GL_1(blendEquation, BlendEquation, WGC3Denum)

DELEGATE_TO_GL_2(blendEquationSeparate, BlendEquationSeparate,
                 WGC3Denum, WGC3Denum)

DELEGATE_TO_GL_2(blendFunc, BlendFunc, WGC3Denum, WGC3Denum)

DELEGATE_TO_GL_4(blendFuncSeparate, BlendFuncSeparate,
                 WGC3Denum, WGC3Denum, WGC3Denum, WGC3Denum)

DELEGATE_TO_GL_4(bufferData, BufferData,
                 WGC3Denum, WGC3Dsizeiptr, const void*, WGC3Denum)

DELEGATE_TO_GL_4(bufferSubData, BufferSubData,
                 WGC3Denum, WGC3Dintptr, WGC3Dsizeiptr, const void*)

DELEGATE_TO_GL_1R(checkFramebufferStatus, CheckFramebufferStatus,
                  WGC3Denum, WGC3Denum)

DELEGATE_TO_GL_1(clear, Clear, WGC3Dbitfield)

DELEGATE_TO_GL_4(clearColor, ClearColor,
                 WGC3Dclampf, WGC3Dclampf, WGC3Dclampf, WGC3Dclampf)

DELEGATE_TO_GL_1(clearDepth, ClearDepthf, WGC3Dclampf)

DELEGATE_TO_GL_1(clearStencil, ClearStencil, WGC3Dint)

DELEGATE_TO_GL_4(colorMask, ColorMask,
                 WGC3Dboolean, WGC3Dboolean, WGC3Dboolean, WGC3Dboolean)

DELEGATE_TO_GL_1(compileShader, CompileShader, WebGLId)

DELEGATE_TO_GL_8(compressedTexImage2D, CompressedTexImage2D,
                 WGC3Denum, WGC3Dint, WGC3Denum, WGC3Dint, WGC3Dint,
                 WGC3Dsizei, WGC3Dsizei, const void*)

DELEGATE_TO_GL_9(compressedTexSubImage2D, CompressedTexSubImage2D,
                 WGC3Denum, WGC3Dint, WGC3Dint, WGC3Dint, WGC3Dint, WGC3Dint,
                 WGC3Denum, WGC3Dsizei, const void*)

DELEGATE_TO_GL_8(copyTexImage2D, CopyTexImage2D,
                 WGC3Denum, WGC3Dint, WGC3Denum, WGC3Dint, WGC3Dint,
                 WGC3Dsizei, WGC3Dsizei, WGC3Dint)

DELEGATE_TO_GL_8(copyTexSubImage2D, CopyTexSubImage2D,
                 WGC3Denum, WGC3Dint, WGC3Dint, WGC3Dint, WGC3Dint, WGC3Dint,
                 WGC3Dsizei, WGC3Dsizei)

DELEGATE_TO_GL_1(cullFace, CullFace, WGC3Denum)

DELEGATE_TO_GL_1(depthFunc, DepthFunc, WGC3Denum)

DELEGATE_TO_GL_1(depthMask, DepthMask, WGC3Dboolean)

DELEGATE_TO_GL_2(depthRange, DepthRangef, WGC3Dclampf, WGC3Dclampf)

DELEGATE_TO_GL_2(detachShader, DetachShader, WebGLId, WebGLId)

DELEGATE_TO_GL_1(disable, Disable, WGC3Denum)

DELEGATE_TO_GL_1(disableVertexAttribArray, DisableVertexAttribArray,
                 WGC3Duint)

DELEGATE_TO_GL_3(drawArrays, DrawArrays, WGC3Denum, WGC3Dint, WGC3Dsizei)

void WebGraphicsContext3DImpl::drawElements(WGC3Denum mode,
                                                         WGC3Dsizei count,
                                                         WGC3Denum type,
                                                         WGC3Dintptr offset) {
  gl_->DrawElements(
      mode, count, type,
      reinterpret_cast<void*>(static_cast<intptr_t>(offset)));
}

DELEGATE_TO_GL_1(enable, Enable, WGC3Denum)

DELEGATE_TO_GL_1(enableVertexAttribArray, EnableVertexAttribArray,
                 WGC3Duint)

void WebGraphicsContext3DImpl::finish() {
  flush_id_ = GenFlushID();
  gl_->Finish();
}

void WebGraphicsContext3DImpl::flush() {
  flush_id_ = GenFlushID();
  gl_->Flush();
}

DELEGATE_TO_GL_4(framebufferRenderbuffer, FramebufferRenderbuffer,
                 WGC3Denum, WGC3Denum, WGC3Denum, WebGLId)

DELEGATE_TO_GL_5(framebufferTexture2D, FramebufferTexture2D,
                 WGC3Denum, WGC3Denum, WGC3Denum, WebGLId, WGC3Dint)

DELEGATE_TO_GL_1(frontFace, FrontFace, WGC3Denum)

DELEGATE_TO_GL_1(generateMipmap, GenerateMipmap, WGC3Denum)

bool WebGraphicsContext3DImpl::getActiveAttrib(
    WebGLId program, WGC3Duint index, ActiveInfo& info) {
  if (!program) {
    synthesizeGLError(GL_INVALID_VALUE);
    return false;
  }
  GLint max_name_length = -1;
  gl_->GetProgramiv(
      program, GL_ACTIVE_ATTRIBUTE_MAX_LENGTH, &max_name_length);
  if (max_name_length < 0)
    return false;
  if (max_name_length == 0) {
    // No active attributes exist.
    synthesizeGLError(GL_INVALID_VALUE);
    return false;
  }
  scoped_ptr<GLchar[]> name(new GLchar[max_name_length]);
  GLsizei length = 0;
  GLint size = -1;
  GLenum type = 0;
  gl_->GetActiveAttrib(
      program, index, max_name_length, &length, &size, &type, name.get());
  if (size < 0) {
    return false;
  }
  info.name = blink::WebString::fromUTF8(name.get(), length);
  info.type = type;
  info.size = size;
  return true;
}

bool WebGraphicsContext3DImpl::getActiveUniform(
    WebGLId program, WGC3Duint index, ActiveInfo& info) {
  GLint max_name_length = -1;
  gl_->GetProgramiv(
      program, GL_ACTIVE_UNIFORM_MAX_LENGTH, &max_name_length);
  if (max_name_length < 0)
    return false;
  if (max_name_length == 0) {
    // No active uniforms exist.
    synthesizeGLError(GL_INVALID_VALUE);
    return false;
  }
  scoped_ptr<GLchar[]> name(new GLchar[max_name_length]);
  GLsizei length = 0;
  GLint size = -1;
  GLenum type = 0;
  gl_->GetActiveUniform(
      program, index, max_name_length, &length, &size, &type, name.get());
  if (size < 0) {
    return false;
  }
  info.name = blink::WebString::fromUTF8(name.get(), length);
  info.type = type;
  info.size = size;
  return true;
}

DELEGATE_TO_GL_4(getAttachedShaders, GetAttachedShaders,
                 WebGLId, WGC3Dsizei, WGC3Dsizei*, WebGLId*)

DELEGATE_TO_GL_2R(getAttribLocation, GetAttribLocation,
                  WebGLId, const WGC3Dchar*, WGC3Dint)

DELEGATE_TO_GL_2(getBooleanv, GetBooleanv, WGC3Denum, WGC3Dboolean*)

DELEGATE_TO_GL_3(getBufferParameteriv, GetBufferParameteriv,
                 WGC3Denum, WGC3Denum, WGC3Dint*)

WGC3Denum WebGraphicsContext3DImpl::getError() {
  if (!synthetic_errors_.empty()) {
    std::vector<WGC3Denum>::iterator iter = synthetic_errors_.begin();
    WGC3Denum err = *iter;
    synthetic_errors_.erase(iter);
    return err;
  }

  return gl_->GetError();
}

DELEGATE_TO_GL_2(getFloatv, GetFloatv, WGC3Denum, WGC3Dfloat*)

DELEGATE_TO_GL_4(getFramebufferAttachmentParameteriv,
                 GetFramebufferAttachmentParameteriv,
                 WGC3Denum, WGC3Denum, WGC3Denum, WGC3Dint*)

DELEGATE_TO_GL_2(getIntegerv, GetIntegerv, WGC3Denum, WGC3Dint*)

DELEGATE_TO_GL_3(getProgramiv, GetProgramiv, WebGLId, WGC3Denum, WGC3Dint*)

blink::WebString WebGraphicsContext3DImpl::getProgramInfoLog(
    WebGLId program) {
  GLint logLength = 0;
  gl_->GetProgramiv(program, GL_INFO_LOG_LENGTH, &logLength);
  if (!logLength)
    return blink::WebString();
  scoped_ptr<GLchar[]> log(new GLchar[logLength]);
  if (!log)
    return blink::WebString();
  GLsizei returnedLogLength = 0;
  gl_->GetProgramInfoLog(
      program, logLength, &returnedLogLength, log.get());
  DCHECK_EQ(logLength, returnedLogLength + 1);
  blink::WebString res =
      blink::WebString::fromUTF8(log.get(), returnedLogLength);
  return res;
}

DELEGATE_TO_GL_3(getRenderbufferParameteriv, GetRenderbufferParameteriv,
                 WGC3Denum, WGC3Denum, WGC3Dint*)

DELEGATE_TO_GL_3(getShaderiv, GetShaderiv, WebGLId, WGC3Denum, WGC3Dint*)

blink::WebString WebGraphicsContext3DImpl::getShaderInfoLog(
    WebGLId shader) {
  GLint logLength = 0;
  gl_->GetShaderiv(shader, GL_INFO_LOG_LENGTH, &logLength);
  if (!logLength)
    return blink::WebString();
  scoped_ptr<GLchar[]> log(new GLchar[logLength]);
  if (!log)
    return blink::WebString();
  GLsizei returnedLogLength = 0;
  gl_->GetShaderInfoLog(
      shader, logLength, &returnedLogLength, log.get());
  DCHECK_EQ(logLength, returnedLogLength + 1);
  blink::WebString res =
      blink::WebString::fromUTF8(log.get(), returnedLogLength);
  return res;
}

DELEGATE_TO_GL_4(getShaderPrecisionFormat, GetShaderPrecisionFormat,
                 WGC3Denum, WGC3Denum, WGC3Dint*, WGC3Dint*)

blink::WebString WebGraphicsContext3DImpl::getShaderSource(
    WebGLId shader) {
  GLint logLength = 0;
  gl_->GetShaderiv(shader, GL_SHADER_SOURCE_LENGTH, &logLength);
  if (!logLength)
    return blink::WebString();
  scoped_ptr<GLchar[]> log(new GLchar[logLength]);
  if (!log)
    return blink::WebString();
  GLsizei returnedLogLength = 0;
  gl_->GetShaderSource(
      shader, logLength, &returnedLogLength, log.get());
  if (!returnedLogLength)
    return blink::WebString();
  DCHECK_EQ(logLength, returnedLogLength + 1);
  blink::WebString res =
      blink::WebString::fromUTF8(log.get(), returnedLogLength);
  return res;
}

blink::WebString WebGraphicsContext3DImpl::
    getTranslatedShaderSourceANGLE(WebGLId shader) {
  GLint logLength = 0;
  gl_->GetShaderiv(
      shader, GL_TRANSLATED_SHADER_SOURCE_LENGTH_ANGLE, &logLength);
  if (!logLength)
    return blink::WebString();
  scoped_ptr<GLchar[]> log(new GLchar[logLength]);
  if (!log)
    return blink::WebString();
  GLsizei returnedLogLength = 0;
  gl_->GetTranslatedShaderSourceANGLE(
      shader, logLength, &returnedLogLength, log.get());
  if (!returnedLogLength)
    return blink::WebString();
  DCHECK_EQ(logLength, returnedLogLength + 1);
  blink::WebString res =
      blink::WebString::fromUTF8(log.get(), returnedLogLength);
  return res;
}

blink::WebString WebGraphicsContext3DImpl::getString(
    WGC3Denum name) {
  return blink::WebString::fromUTF8(
      reinterpret_cast<const char*>(gl_->GetString(name)));
}

DELEGATE_TO_GL_3(getTexParameterfv, GetTexParameterfv,
                 WGC3Denum, WGC3Denum, WGC3Dfloat*)

DELEGATE_TO_GL_3(getTexParameteriv, GetTexParameteriv,
                 WGC3Denum, WGC3Denum, WGC3Dint*)

DELEGATE_TO_GL_3(getUniformfv, GetUniformfv, WebGLId, WGC3Dint, WGC3Dfloat*)

DELEGATE_TO_GL_3(getUniformiv, GetUniformiv, WebGLId, WGC3Dint, WGC3Dint*)

DELEGATE_TO_GL_2R(getUniformLocation, GetUniformLocation,
                  WebGLId, const WGC3Dchar*, WGC3Dint)

DELEGATE_TO_GL_3(getVertexAttribfv, GetVertexAttribfv,
                 WGC3Duint, WGC3Denum, WGC3Dfloat*)

DELEGATE_TO_GL_3(getVertexAttribiv, GetVertexAttribiv,
                 WGC3Duint, WGC3Denum, WGC3Dint*)

WGC3Dsizeiptr WebGraphicsContext3DImpl::getVertexAttribOffset(
    WGC3Duint index, WGC3Denum pname) {
  GLvoid* value = NULL;
  // NOTE: If pname is ever a value that returns more then 1 element
  // this will corrupt memory.
  gl_->GetVertexAttribPointerv(index, pname, &value);
  return static_cast<WGC3Dsizeiptr>(reinterpret_cast<intptr_t>(value));
}

DELEGATE_TO_GL_2(hint, Hint, WGC3Denum, WGC3Denum)

DELEGATE_TO_GL_1RB(isBuffer, IsBuffer, WebGLId, WGC3Dboolean)

DELEGATE_TO_GL_1RB(isEnabled, IsEnabled, WGC3Denum, WGC3Dboolean)

DELEGATE_TO_GL_1RB(isFramebuffer, IsFramebuffer, WebGLId, WGC3Dboolean)

DELEGATE_TO_GL_1RB(isProgram, IsProgram, WebGLId, WGC3Dboolean)

DELEGATE_TO_GL_1RB(isRenderbuffer, IsRenderbuffer, WebGLId, WGC3Dboolean)

DELEGATE_TO_GL_1RB(isShader, IsShader, WebGLId, WGC3Dboolean)

DELEGATE_TO_GL_1RB(isTexture, IsTexture, WebGLId, WGC3Dboolean)

DELEGATE_TO_GL_1(lineWidth, LineWidth, WGC3Dfloat)

DELEGATE_TO_GL_1(linkProgram, LinkProgram, WebGLId)

DELEGATE_TO_GL_2(pixelStorei, PixelStorei, WGC3Denum, WGC3Dint)

DELEGATE_TO_GL_2(polygonOffset, PolygonOffset, WGC3Dfloat, WGC3Dfloat)

DELEGATE_TO_GL_7(readPixels, ReadPixels,
                 WGC3Dint, WGC3Dint, WGC3Dsizei, WGC3Dsizei, WGC3Denum,
                 WGC3Denum, void*)

DELEGATE_TO_GL_4(renderbufferStorage, RenderbufferStorage,
                 WGC3Denum, WGC3Denum, WGC3Dsizei, WGC3Dsizei)

DELEGATE_TO_GL_2(sampleCoverage, SampleCoverage, WGC3Dfloat, WGC3Dboolean)

DELEGATE_TO_GL_4(scissor, Scissor, WGC3Dint, WGC3Dint, WGC3Dsizei, WGC3Dsizei)

void WebGraphicsContext3DImpl::shaderSource(
    WebGLId shader, const WGC3Dchar* string) {
  GLint length = strlen(string);
  gl_->ShaderSource(shader, 1, &string, &length);
}

DELEGATE_TO_GL_3(stencilFunc, StencilFunc, WGC3Denum, WGC3Dint, WGC3Duint)

DELEGATE_TO_GL_4(stencilFuncSeparate, StencilFuncSeparate,
                 WGC3Denum, WGC3Denum, WGC3Dint, WGC3Duint)

DELEGATE_TO_GL_1(stencilMask, StencilMask, WGC3Duint)

DELEGATE_TO_GL_2(stencilMaskSeparate, StencilMaskSeparate,
                 WGC3Denum, WGC3Duint)

DELEGATE_TO_GL_3(stencilOp, StencilOp,
                 WGC3Denum, WGC3Denum, WGC3Denum)

DELEGATE_TO_GL_4(stencilOpSeparate, StencilOpSeparate,
                 WGC3Denum, WGC3Denum, WGC3Denum, WGC3Denum)

DELEGATE_TO_GL_9(texImage2D, TexImage2D,
                 WGC3Denum, WGC3Dint, WGC3Denum, WGC3Dsizei, WGC3Dsizei,
                 WGC3Dint, WGC3Denum, WGC3Denum, const void*)

DELEGATE_TO_GL_3(texParameterf, TexParameterf,
                 WGC3Denum, WGC3Denum, WGC3Dfloat);

static const unsigned int kTextureWrapR = 0x8072;

void WebGraphicsContext3DImpl::texParameteri(
    WGC3Denum target, WGC3Denum pname, WGC3Dint param) {
  // TODO(kbr): figure out whether the setting of TEXTURE_WRAP_R in
  // GraphicsContext3D.cpp is strictly necessary to avoid seams at the
  // edge of cube maps, and, if it is, push it into the GLES2 service
  // side code.
  if (pname == kTextureWrapR) {
    return;
  }
  gl_->TexParameteri(target, pname, param);
}

DELEGATE_TO_GL_9(texSubImage2D, TexSubImage2D,
                 WGC3Denum, WGC3Dint, WGC3Dint, WGC3Dint, WGC3Dsizei,
                 WGC3Dsizei, WGC3Denum, WGC3Denum, const void*)

DELEGATE_TO_GL_2(uniform1f, Uniform1f, WGC3Dint, WGC3Dfloat)

DELEGATE_TO_GL_3(uniform1fv, Uniform1fv, WGC3Dint, WGC3Dsizei,
                 const WGC3Dfloat*)

DELEGATE_TO_GL_2(uniform1i, Uniform1i, WGC3Dint, WGC3Dint)

DELEGATE_TO_GL_3(uniform1iv, Uniform1iv, WGC3Dint, WGC3Dsizei, const WGC3Dint*)

DELEGATE_TO_GL_3(uniform2f, Uniform2f, WGC3Dint, WGC3Dfloat, WGC3Dfloat)

DELEGATE_TO_GL_3(uniform2fv, Uniform2fv, WGC3Dint, WGC3Dsizei,
                 const WGC3Dfloat*)

DELEGATE_TO_GL_3(uniform2i, Uniform2i, WGC3Dint, WGC3Dint, WGC3Dint)

DELEGATE_TO_GL_3(uniform2iv, Uniform2iv, WGC3Dint, WGC3Dsizei, const WGC3Dint*)

DELEGATE_TO_GL_4(uniform3f, Uniform3f, WGC3Dint,
                 WGC3Dfloat, WGC3Dfloat, WGC3Dfloat)

DELEGATE_TO_GL_3(uniform3fv, Uniform3fv, WGC3Dint, WGC3Dsizei,
                 const WGC3Dfloat*)

DELEGATE_TO_GL_4(uniform3i, Uniform3i, WGC3Dint, WGC3Dint, WGC3Dint, WGC3Dint)

DELEGATE_TO_GL_3(uniform3iv, Uniform3iv, WGC3Dint, WGC3Dsizei, const WGC3Dint*)

DELEGATE_TO_GL_5(uniform4f, Uniform4f, WGC3Dint,
                 WGC3Dfloat, WGC3Dfloat, WGC3Dfloat, WGC3Dfloat)

DELEGATE_TO_GL_3(uniform4fv, Uniform4fv, WGC3Dint, WGC3Dsizei,
                 const WGC3Dfloat*)

DELEGATE_TO_GL_5(uniform4i, Uniform4i, WGC3Dint,
                 WGC3Dint, WGC3Dint, WGC3Dint, WGC3Dint)

DELEGATE_TO_GL_3(uniform4iv, Uniform4iv, WGC3Dint, WGC3Dsizei, const WGC3Dint*)

DELEGATE_TO_GL_4(uniformMatrix2fv, UniformMatrix2fv,
                 WGC3Dint, WGC3Dsizei, WGC3Dboolean, const WGC3Dfloat*)

DELEGATE_TO_GL_4(uniformMatrix3fv, UniformMatrix3fv,
                 WGC3Dint, WGC3Dsizei, WGC3Dboolean, const WGC3Dfloat*)

DELEGATE_TO_GL_4(uniformMatrix4fv, UniformMatrix4fv,
                 WGC3Dint, WGC3Dsizei, WGC3Dboolean, const WGC3Dfloat*)

DELEGATE_TO_GL_1(useProgram, UseProgram, WebGLId)

DELEGATE_TO_GL_1(validateProgram, ValidateProgram, WebGLId)

DELEGATE_TO_GL_2(vertexAttrib1f, VertexAttrib1f, WGC3Duint, WGC3Dfloat)

DELEGATE_TO_GL_2(vertexAttrib1fv, VertexAttrib1fv, WGC3Duint,
                 const WGC3Dfloat*)

DELEGATE_TO_GL_3(vertexAttrib2f, VertexAttrib2f, WGC3Duint,
                 WGC3Dfloat, WGC3Dfloat)

DELEGATE_TO_GL_2(vertexAttrib2fv, VertexAttrib2fv, WGC3Duint,
                 const WGC3Dfloat*)

DELEGATE_TO_GL_4(vertexAttrib3f, VertexAttrib3f, WGC3Duint,
                 WGC3Dfloat, WGC3Dfloat, WGC3Dfloat)

DELEGATE_TO_GL_2(vertexAttrib3fv, VertexAttrib3fv, WGC3Duint,
                 const WGC3Dfloat*)

DELEGATE_TO_GL_5(vertexAttrib4f, VertexAttrib4f, WGC3Duint,
                 WGC3Dfloat, WGC3Dfloat, WGC3Dfloat, WGC3Dfloat)

DELEGATE_TO_GL_2(vertexAttrib4fv, VertexAttrib4fv, WGC3Duint,
                 const WGC3Dfloat*)

void WebGraphicsContext3DImpl::vertexAttribPointer(
    WGC3Duint index, WGC3Dint size, WGC3Denum type, WGC3Dboolean normalized,
    WGC3Dsizei stride, WGC3Dintptr offset) {
  gl_->VertexAttribPointer(
      index, size, type, normalized, stride,
      reinterpret_cast<void*>(static_cast<intptr_t>(offset)));
}

DELEGATE_TO_GL_4(viewport, Viewport,
                 WGC3Dint, WGC3Dint, WGC3Dsizei, WGC3Dsizei)

WebGLId WebGraphicsContext3DImpl::createBuffer() {
  GLuint o;
  gl_->GenBuffers(1, &o);
  return o;
}

WebGLId WebGraphicsContext3DImpl::createFramebuffer() {
  GLuint o = 0;
  gl_->GenFramebuffers(1, &o);
  return o;
}

WebGLId WebGraphicsContext3DImpl::createRenderbuffer() {
  GLuint o;
  gl_->GenRenderbuffers(1, &o);
  return o;
}

WebGLId WebGraphicsContext3DImpl::createTexture() {
  GLuint o;
  gl_->GenTextures(1, &o);
  return o;
}

void WebGraphicsContext3DImpl::deleteBuffer(WebGLId buffer) {
  gl_->DeleteBuffers(1, &buffer);
}

void WebGraphicsContext3DImpl::deleteFramebuffer(
    WebGLId framebuffer) {
  gl_->DeleteFramebuffers(1, &framebuffer);
}

void WebGraphicsContext3DImpl::deleteRenderbuffer(
    WebGLId renderbuffer) {
  gl_->DeleteRenderbuffers(1, &renderbuffer);
}

void WebGraphicsContext3DImpl::deleteTexture(WebGLId texture) {
  gl_->DeleteTextures(1, &texture);
}

DELEGATE_TO_GL_R(createProgram, CreateProgram, WebGLId)

DELEGATE_TO_GL_1R(createShader, CreateShader, WGC3Denum, WebGLId)

DELEGATE_TO_GL_1(deleteProgram, DeleteProgram, WebGLId)

DELEGATE_TO_GL_1(deleteShader, DeleteShader, WebGLId)

void WebGraphicsContext3DImpl::setErrorMessageCallback(
    WebGraphicsContext3D::WebGraphicsErrorMessageCallback* cb) {
  error_message_callback_ = cb;
}

void WebGraphicsContext3DImpl::setContextLostCallback(
    WebGraphicsContext3D::WebGraphicsContextLostCallback* cb) {
  context_lost_callback_ = cb;
}

DELEGATE_TO_GL_5(texImageIOSurface2DCHROMIUM, TexImageIOSurface2DCHROMIUM,
                 WGC3Denum, WGC3Dint, WGC3Dint, WGC3Duint, WGC3Duint)

DELEGATE_TO_GL_5(texStorage2DEXT, TexStorage2DEXT,
                 WGC3Denum, WGC3Dint, WGC3Duint, WGC3Dint, WGC3Dint)

WebGLId WebGraphicsContext3DImpl::createQueryEXT() {
  GLuint o;
  gl_->GenQueriesEXT(1, &o);
  return o;
}

void WebGraphicsContext3DImpl::deleteQueryEXT(
    WebGLId query) {
  gl_->DeleteQueriesEXT(1, &query);
}

DELEGATE_TO_GL_1R(isQueryEXT, IsQueryEXT, WebGLId, WGC3Dboolean)
DELEGATE_TO_GL_2(beginQueryEXT, BeginQueryEXT, WGC3Denum, WebGLId)
DELEGATE_TO_GL_1(endQueryEXT, EndQueryEXT, WGC3Denum)
DELEGATE_TO_GL_3(getQueryivEXT, GetQueryivEXT, WGC3Denum, WGC3Denum, WGC3Dint*)
DELEGATE_TO_GL_3(getQueryObjectuivEXT, GetQueryObjectuivEXT,
                 WebGLId, WGC3Denum, WGC3Duint*)

void WebGraphicsContext3DImpl::copyTextureCHROMIUM(WGC3Denum target,
                                                   WebGLId source_id,
                                                   WebGLId dest_id,
                                                   WGC3Dint level,
                                                   WGC3Denum internal_format,
                                                   WGC3Denum dest_type) {
  copyTextureCHROMIUM(target, source_id, dest_id, internal_format, dest_type);
}

void WebGraphicsContext3DImpl::copySubTextureCHROMIUM(WGC3Denum target,
                                                      WebGLId source_id,
                                                      WebGLId dest_id,
                                                      WGC3Dint level,
                                                      WGC3Dint xoffset,
                                                      WGC3Dint yoffset) {
  copySubTextureCHROMIUM(target, source_id, dest_id, xoffset, yoffset);
}

DELEGATE_TO_GL_5(copyTextureCHROMIUM,
                 CopyTextureCHROMIUM,
                 WGC3Denum,
                 WebGLId,
                 WebGLId,
                 WGC3Denum,
                 WGC3Denum);

DELEGATE_TO_GL_5(copySubTextureCHROMIUM,
                 CopySubTextureCHROMIUM,
                 WGC3Denum,
                 WebGLId,
                 WebGLId,
                 WGC3Dint,
                 WGC3Dint);

DELEGATE_TO_GL_3(bindUniformLocationCHROMIUM, BindUniformLocationCHROMIUM,
                 WebGLId, WGC3Dint, const WGC3Dchar*)

void WebGraphicsContext3DImpl::shallowFlushCHROMIUM() {
  flush_id_ = GenFlushID();
  gl_->ShallowFlushCHROMIUM();
}

void WebGraphicsContext3DImpl::shallowFinishCHROMIUM() {
  flush_id_ = GenFlushID();
  gl_->ShallowFinishCHROMIUM();
}

DELEGATE_TO_GL_1(waitSyncPoint, WaitSyncPointCHROMIUM, GLuint)

void WebGraphicsContext3DImpl::loseContextCHROMIUM(
    WGC3Denum current, WGC3Denum other) {
  gl_->LoseContextCHROMIUM(current, other);
  gl_->Flush();
}

DELEGATE_TO_GL_1(genMailboxCHROMIUM, GenMailboxCHROMIUM, WGC3Dbyte*)
DELEGATE_TO_GL_2(produceTextureCHROMIUM, ProduceTextureCHROMIUM,
                 WGC3Denum, const WGC3Dbyte*)
DELEGATE_TO_GL_3(produceTextureDirectCHROMIUM, ProduceTextureDirectCHROMIUM,
                 WebGLId, WGC3Denum, const WGC3Dbyte*)
DELEGATE_TO_GL_2(consumeTextureCHROMIUM, ConsumeTextureCHROMIUM,
                 WGC3Denum, const WGC3Dbyte*)
DELEGATE_TO_GL_2R(createAndConsumeTextureCHROMIUM,
                  CreateAndConsumeTextureCHROMIUM,
                  WGC3Denum, const WGC3Dbyte*, WebGLId)

DELEGATE_TO_GL_2(genValuebuffersCHROMIUM,
                 GenValuebuffersCHROMIUM,
                 WGC3Dsizei,
                 WebGLId*);

WebGLId WebGraphicsContext3DImpl::createValuebufferCHROMIUM() {
  GLuint o;
  gl_->GenValuebuffersCHROMIUM(1, &o);
  return o;
}

DELEGATE_TO_GL_2(deleteValuebuffersCHROMIUM,
                 DeleteValuebuffersCHROMIUM,
                 WGC3Dsizei,
                 WebGLId*);

void WebGraphicsContext3DImpl::deleteValuebufferCHROMIUM(WebGLId valuebuffer) {
  gl_->DeleteValuebuffersCHROMIUM(1, &valuebuffer);
}

DELEGATE_TO_GL_1RB(isValuebufferCHROMIUM,
                   IsValuebufferCHROMIUM,
                   WebGLId,
                   WGC3Dboolean)
DELEGATE_TO_GL_2(bindValuebufferCHROMIUM,
                 BindValuebufferCHROMIUM,
                 WGC3Denum,
                 WebGLId)
DELEGATE_TO_GL_2(subscribeValueCHROMIUM,
                 SubscribeValueCHROMIUM,
                 WGC3Denum,
                 WGC3Denum);
DELEGATE_TO_GL_1(populateSubscribedValuesCHROMIUM,
                 PopulateSubscribedValuesCHROMIUM,
                 WGC3Denum);
DELEGATE_TO_GL_3(uniformValuebufferCHROMIUM,
                 UniformValuebufferCHROMIUM,
                 WGC3Dint,
                 WGC3Denum,
                 WGC3Denum);
DELEGATE_TO_GL_2(traceBeginCHROMIUM,
                 TraceBeginCHROMIUM,
                 const WGC3Dchar*,
                 const WGC3Dchar*);
DELEGATE_TO_GL(traceEndCHROMIUM, TraceEndCHROMIUM);

void WebGraphicsContext3DImpl::insertEventMarkerEXT(
    const WGC3Dchar* marker) {
  gl_->InsertEventMarkerEXT(0, marker);
}

void WebGraphicsContext3DImpl::pushGroupMarkerEXT(
    const WGC3Dchar* marker) {
  gl_->PushGroupMarkerEXT(0, marker);
}

DELEGATE_TO_GL(popGroupMarkerEXT, PopGroupMarkerEXT);

WebGLId WebGraphicsContext3DImpl::createVertexArrayOES() {
  GLuint array;
  gl_->GenVertexArraysOES(1, &array);
  return array;
}

void WebGraphicsContext3DImpl::deleteVertexArrayOES(
    WebGLId array) {
  gl_->DeleteVertexArraysOES(1, &array);
}

DELEGATE_TO_GL_1R(isVertexArrayOES, IsVertexArrayOES, WebGLId, WGC3Dboolean)
DELEGATE_TO_GL_1(bindVertexArrayOES, BindVertexArrayOES, WebGLId)

DELEGATE_TO_GL_2(bindTexImage2DCHROMIUM, BindTexImage2DCHROMIUM,
                 WGC3Denum, WGC3Dint)
DELEGATE_TO_GL_2(releaseTexImage2DCHROMIUM, ReleaseTexImage2DCHROMIUM,
                 WGC3Denum, WGC3Dint)

DELEGATE_TO_GL_2R(mapBufferCHROMIUM, MapBufferCHROMIUM, WGC3Denum, WGC3Denum,
                  void*)
DELEGATE_TO_GL_1R(unmapBufferCHROMIUM, UnmapBufferCHROMIUM, WGC3Denum,
                  WGC3Dboolean)

DELEGATE_TO_GL_9(asyncTexImage2DCHROMIUM, AsyncTexImage2DCHROMIUM, WGC3Denum,
                 WGC3Dint, WGC3Denum, WGC3Dsizei, WGC3Dsizei, WGC3Dint,
                 WGC3Denum, WGC3Denum, const void*)
DELEGATE_TO_GL_9(asyncTexSubImage2DCHROMIUM, AsyncTexSubImage2DCHROMIUM,
                 WGC3Denum, WGC3Dint, WGC3Dint, WGC3Dint, WGC3Dsizei,
                 WGC3Dsizei, WGC3Denum, WGC3Denum, const void*)

DELEGATE_TO_GL_1(waitAsyncTexImage2DCHROMIUM, WaitAsyncTexImage2DCHROMIUM,
                 WGC3Denum)

DELEGATE_TO_GL_2(drawBuffersEXT, DrawBuffersEXT, WGC3Dsizei, const WGC3Denum*)

DELEGATE_TO_GL_4(drawArraysInstancedANGLE, DrawArraysInstancedANGLE, WGC3Denum,
                 WGC3Dint, WGC3Dsizei, WGC3Dsizei)

void WebGraphicsContext3DImpl::drawElementsInstancedANGLE(
    WGC3Denum mode,
    WGC3Dsizei count,
    WGC3Denum type,
    WGC3Dintptr offset,
    WGC3Dsizei primcount) {
  gl_->DrawElementsInstancedANGLE(
      mode, count, type,
      reinterpret_cast<void*>(static_cast<intptr_t>(offset)), primcount);
}

DELEGATE_TO_GL_2(vertexAttribDivisorANGLE, VertexAttribDivisorANGLE, WGC3Duint,
                 WGC3Duint)

DELEGATE_TO_GL_4R(createGpuMemoryBufferImageCHROMIUM,
                  CreateGpuMemoryBufferImageCHROMIUM,
                  WGC3Dsizei,
                  WGC3Dsizei,
                  WGC3Denum,
                  WGC3Denum,
                  WGC3Duint);

DELEGATE_TO_GL_1(destroyImageCHROMIUM, DestroyImageCHROMIUM, WGC3Duint);

DELEGATE_TO_GL_6(framebufferTexture2DMultisampleEXT,
                 FramebufferTexture2DMultisampleEXT,
                 WGC3Denum, WGC3Denum, WGC3Denum, WebGLId, WGC3Dint, WGC3Dsizei)

DELEGATE_TO_GL_5(renderbufferStorageMultisampleEXT,
                 RenderbufferStorageMultisampleEXT, WGC3Denum, WGC3Dsizei,
                 WGC3Denum, WGC3Dsizei, WGC3Dsizei)

DELEGATE_TO_GL_1(beginTransformFeedback, BeginTransformFeedback, WGC3Denum)
DELEGATE_TO_GL_3(bindBufferBase, BindBufferBase, WGC3Denum, WGC3Duint,
                 WGC3Duint)
DELEGATE_TO_GL_5(bindBufferRange, BindBufferRange, WGC3Denum, WGC3Duint,
                 WGC3Duint, WGC3Dintptr, WGC3Dsizeiptr)
DELEGATE_TO_GL_2(bindSampler, BindSampler, WGC3Duint, WebGLId)
DELEGATE_TO_GL_2(bindTransformFeedback, BindTransformFeedback, WGC3Denum,
                 WebGLId)
DELEGATE_TO_GL_4(clearBufferfi, ClearBufferfi, WGC3Denum, WGC3Dint, WGC3Dfloat,
                 WGC3Dint)
DELEGATE_TO_GL_3(clearBufferfv, ClearBufferfv, WGC3Denum, WGC3Dint,
                 const WGC3Dfloat *)
DELEGATE_TO_GL_3(clearBufferiv, ClearBufferiv, WGC3Denum, WGC3Dint,
                 const WGC3Dint *)
DELEGATE_TO_GL_3(clearBufferuiv, ClearBufferuiv, WGC3Denum, WGC3Dint,
                 const WGC3Duint *)
//DELEGATE_TO_GL_3R(clientWaitSync, ClientWaitSync, WebGLId, WGC3Dbitfield,
//                  WGC3Duint64, WGC3Denum)
//DELEGATE_TO_GL_9(compressedTexImage3D, CompressedTexImage3D, WGC3Denum,
//                 WGC3Dint, WGC3Denum, WGC3Dsizei, WGC3Dsizei, WGC3Dsizei,
//                 WGC3Dint, WGC3Dsizei, const void *)
//DELEGATE_TO_GL_11(compressedTexSubImage3D, CompressedTexSubImage3D, WGC3Denum,
//                  WGC3Dint, WGC3Dint, WGC3Dint, WGC3Dint, WGC3Dsizei,
//                  WGC3Dsizei, WGC3Dsizei, WGC3Denum, WGC3Dsizei, const void *)
DELEGATE_TO_GL_5(copyBufferSubData, CopyBufferSubData, WGC3Denum, WGC3Denum,
                 WGC3Dintptr, WGC3Dintptr, WGC3Dsizeiptr)
DELEGATE_TO_GL_9(copyTexSubImage3D, CopyTexSubImage3D, WGC3Denum, WGC3Dint,
                 WGC3Dint, WGC3Dint, WGC3Dint, WGC3Dint, WGC3Dint, WGC3Dsizei,
                 WGC3Dsizei)
WebGLId WebGraphicsContext3DImpl::createSampler() {
  GLuint sampler;
  gl_->GenSamplers(1, &sampler);
  return sampler;
}
WebGLId WebGraphicsContext3DImpl::createTransformFeedback() {
  GLuint tf;
  gl_->GenTransformFeedbacks(1, &tf);
  return tf;
}
void WebGraphicsContext3DImpl::deleteSampler(WebGLId sampler) {
  gl_->DeleteSamplers(1, &sampler);
}
//DELEGATE_TO_GL_1(deleteSync, DeleteSync, WebGLId)
void WebGraphicsContext3DImpl::deleteTransformFeedback(WebGLId tf) {
  gl_->DeleteTransformFeedbacks(1, &tf);
}
DELEGATE_TO_GL(endTransformFeedback, EndTransformFeedback)
//DELEGATE_TO_GL_2R(fenceSync, FenceSync, WGC3Denum, WGC3Dbitfield, WebGLId)
DELEGATE_TO_GL_5(framebufferTextureLayer, FramebufferTextureLayer, WGC3Denum,
                 WGC3Denum, WGC3Duint, WGC3Dint, WGC3Dint)
DELEGATE_TO_GL_5(getActiveUniformBlockName, GetActiveUniformBlockName,
                 WGC3Duint, WGC3Duint, WGC3Dsizei, WGC3Dsizei *, WGC3Dchar *)
DELEGATE_TO_GL_4(getActiveUniformBlockiv, GetActiveUniformBlockiv, WGC3Duint,
                 WGC3Duint, WGC3Denum, WGC3Dint *)
//DELEGATE_TO_GL_5(getActiveUniformsiv, GetActiveUniformsiv, WGC3Duint,
//                 WGC3Dsizei, const WGC3Duint *, WGC3Denum, WGC3Dint *)
DELEGATE_TO_GL_2R(getFragDataLocation, GetFragDataLocation, WGC3Duint,
                  const WGC3Dchar *, WGC3Dint)
DELEGATE_TO_GL_5(getInternalformativ, GetInternalformativ, WGC3Denum, WGC3Denum,
                 WGC3Denum, WGC3Dsizei, WGC3Dint *)
DELEGATE_TO_GL_3(getSamplerParameterfv, GetSamplerParameterfv, WGC3Duint,
                 WGC3Denum, WGC3Dfloat *)
DELEGATE_TO_GL_3(getSamplerParameteriv, GetSamplerParameteriv, WGC3Duint,
                 WGC3Denum, WGC3Dint *)
//DELEGATE_TO_GL_7(getTransformFeedbackVarying, GetTransformFeedbackVarying,
//                 WGC3Duint, WGC3Duint, WGC3Dsizei, WGC3Dsizei *, WGC3Dsizei *,
//                 WGC3Denum *, WGC3Dchar *)
DELEGATE_TO_GL_2R(getUniformBlockIndex, GetUniformBlockIndex, WGC3Duint,
                  const WGC3Dchar *, WGC3Duint)
//DELEGATE_TO_GL_4(getUniformIndices, GetUniformIndices, WGC3Duint, WGC3Dsizei,
//                 const WGC3Dchar *const*, WGC3Duint *)
//DELEGATE_TO_GL_3(getUniformuiv, GetUniformuiv, WGC3Duint, WGC3Dint,
//                 WGC3Duint *)
//DELEGATE_TO_GL_3(getVertexAttribIiv, GetVertexAttribIiv, WGC3Duint,
//                 WGC3Denum, WGC3Dint *)
//DELEGATE_TO_GL_3(getVertexAttribIuiv, GetVertexAttribIuiv, WGC3Duint,
//                 WGC3Denum, WGC3Duint *)
DELEGATE_TO_GL_3(invalidateFramebuffer, InvalidateFramebuffer, WGC3Denum,
                 WGC3Dsizei, const WGC3Denum *)
DELEGATE_TO_GL_7(invalidateSubFramebuffer, InvalidateSubFramebuffer, WGC3Denum,
                 WGC3Dsizei, const WGC3Denum *, WGC3Dint, WGC3Dint, WGC3Dsizei,
                 WGC3Dsizei)
DELEGATE_TO_GL_1R(isSampler, IsSampler, WebGLId, WGC3Dboolean)
//DELEGATE_TO_GL_1R(isSync, IsSync, WebGLId, WGC3Dboolean)
DELEGATE_TO_GL_1R(isTransformFeedback, IsTransformFeedback, WGC3Duint,
                  WGC3Dboolean)
DELEGATE_TO_GL(pauseTransformFeedback, PauseTransformFeedback)
//DELEGATE_TO_GL_3(programParameteri, ProgramParameteri, WGC3Duint, WGC3Denum,
//                 WGC3Dint)
DELEGATE_TO_GL_1(readBuffer, ReadBuffer, WGC3Denum)
DELEGATE_TO_GL(resumeTransformFeedback, ResumeTransformFeedback)
DELEGATE_TO_GL_3(samplerParameterf, SamplerParameterf, WGC3Duint, WGC3Denum,
                 WGC3Dfloat)
DELEGATE_TO_GL_3(samplerParameterfv, SamplerParameterfv, WGC3Duint, WGC3Denum,
                 const WGC3Dfloat *)
DELEGATE_TO_GL_3(samplerParameteri, SamplerParameteri, WGC3Duint, WGC3Denum,
                 WGC3Dint)
DELEGATE_TO_GL_3(samplerParameteriv, SamplerParameteriv, WGC3Duint, WGC3Denum,
                 const WGC3Dint *)
DELEGATE_TO_GL_10(texImage3D, TexImage3D, WGC3Denum, WGC3Dint, WGC3Dint,
                  WGC3Dsizei, WGC3Dsizei, WGC3Dsizei, WGC3Dint, WGC3Denum,
                  WGC3Denum, const void *)
DELEGATE_TO_GL_6(texStorage3D, TexStorage3D, WGC3Denum, WGC3Dsizei, WGC3Denum,
                 WGC3Dsizei, WGC3Dsizei, WGC3Dsizei)
DELEGATE_TO_GL_11(texSubImage3D, TexSubImage3D, WGC3Denum, WGC3Dint, WGC3Dint,
                  WGC3Dint, WGC3Dint, WGC3Dsizei, WGC3Dsizei, WGC3Dsizei,
                  WGC3Denum, WGC3Denum, const void *)
DELEGATE_TO_GL_4(transformFeedbackVaryings, TransformFeedbackVaryings,
                 WGC3Duint, WGC3Dsizei, const WGC3Dchar *const*, WGC3Denum)
DELEGATE_TO_GL_2(uniform1ui, Uniform1ui, WGC3Dint, WGC3Duint)
DELEGATE_TO_GL_3(uniform1uiv, Uniform1uiv, WGC3Dint, WGC3Dsizei,
                 const WGC3Duint *)
DELEGATE_TO_GL_3(uniform2ui, Uniform2ui, WGC3Dint, WGC3Duint, WGC3Duint)
DELEGATE_TO_GL_3(uniform2uiv, Uniform2uiv, WGC3Dint, WGC3Dsizei,
                 const WGC3Duint *)
DELEGATE_TO_GL_4(uniform3ui, Uniform3ui, WGC3Dint, WGC3Duint, WGC3Duint,
                 WGC3Duint)
DELEGATE_TO_GL_3(uniform3uiv, Uniform3uiv, WGC3Dint, WGC3Dsizei,
                 const WGC3Duint *)
DELEGATE_TO_GL_5(uniform4ui, Uniform4ui, WGC3Dint, WGC3Duint, WGC3Duint,
                 WGC3Duint, WGC3Duint)
DELEGATE_TO_GL_3(uniform4uiv, Uniform4uiv, WGC3Dint, WGC3Dsizei,
                 const WGC3Duint *)
DELEGATE_TO_GL_3(uniformBlockBinding, UniformBlockBinding, WGC3Duint, WGC3Duint,
                 WGC3Duint)
DELEGATE_TO_GL_4(uniformMatrix2x3fv, UniformMatrix2x3fv, WGC3Dint, WGC3Dsizei,
                 WGC3Dboolean, const WGC3Dfloat*)
DELEGATE_TO_GL_4(uniformMatrix2x4fv, UniformMatrix2x4fv, WGC3Dint, WGC3Dsizei,
                 WGC3Dboolean, const WGC3Dfloat*)
DELEGATE_TO_GL_4(uniformMatrix3x2fv, UniformMatrix3x2fv, WGC3Dint, WGC3Dsizei,
                 WGC3Dboolean, const WGC3Dfloat*)
DELEGATE_TO_GL_4(uniformMatrix3x4fv, UniformMatrix3x4fv, WGC3Dint, WGC3Dsizei,
                 WGC3Dboolean, const WGC3Dfloat*)
DELEGATE_TO_GL_4(uniformMatrix4x2fv, UniformMatrix4x2fv, WGC3Dint, WGC3Dsizei,
                 WGC3Dboolean, const WGC3Dfloat*)
DELEGATE_TO_GL_4(uniformMatrix4x3fv, UniformMatrix4x3fv, WGC3Dint, WGC3Dsizei,
                 WGC3Dboolean, const WGC3Dfloat*)
DELEGATE_TO_GL_5(vertexAttribI4i, VertexAttribI4i, WGC3Duint, WGC3Dint,
                 WGC3Dint, WGC3Dint, WGC3Dint)
DELEGATE_TO_GL_2(vertexAttribI4iv, VertexAttribI4iv, WGC3Duint,
                 const WGC3Dint *)
DELEGATE_TO_GL_5(vertexAttribI4ui, VertexAttribI4ui, WGC3Duint, WGC3Duint,
                 WGC3Duint, WGC3Duint, WGC3Duint)
DELEGATE_TO_GL_2(vertexAttribI4uiv, VertexAttribI4uiv, WGC3Duint,
                 const WGC3Duint *)
void WebGraphicsContext3DImpl::vertexAttribIPointer(
    WGC3Duint index, WGC3Dint size, WGC3Denum type, WGC3Dsizei stride,
    WGC3Dintptr offset) {
  gl_->VertexAttribIPointer(
      index, size, type, stride,
      reinterpret_cast<void*>(static_cast<intptr_t>(offset)));
}
//DELEGATE_TO_GL_3(waitSync, WaitSync, WebGLId, WGC3Dbitfield, WGC3Duint64)

GrGLInterface* WebGraphicsContext3DImpl::createGrGLInterface() {
  return skia_bindings::CreateCommandBufferSkiaGLBinding();
}

::gpu::gles2::GLES2ImplementationErrorMessageCallback*
    WebGraphicsContext3DImpl::getErrorMessageCallback() {
  if (!client_error_message_callback_) {
    client_error_message_callback_.reset(
        new WebGraphicsContext3DErrorMessageCallback(this));
  }
  return client_error_message_callback_.get();
}

void WebGraphicsContext3DImpl::OnErrorMessage(
    const std::string& message, int id) {
  if (error_message_callback_) {
    blink::WebString str = blink::WebString::fromUTF8(message.c_str());
    error_message_callback_->onErrorMessage(str, id);
  }
}

// TODO(bajones): Look into removing these functions from the blink interface
void WebGraphicsContext3DImpl::prepareTexture() {
  NOTREACHED();
}

void WebGraphicsContext3DImpl::postSubBufferCHROMIUM(
    int x, int y, int width, int height) {
  NOTREACHED();
}

void WebGraphicsContext3DImpl::setVisibilityCHROMIUM(
    bool visible) {
  NOTREACHED();
}

void WebGraphicsContext3DImpl::copyTextureToParentTextureCHROMIUM(
    WebGLId texture, WebGLId parentTexture) {
  NOTIMPLEMENTED();
}

void WebGraphicsContext3DImpl::releaseShaderCompiler() {
}

// static
void WebGraphicsContext3DImpl::ConvertAttributes(
    const blink::WebGraphicsContext3D::Attributes& attributes,
    ::gpu::gles2::ContextCreationAttribHelper* output_attribs) {
  output_attribs->alpha_size = attributes.alpha ? 8 : 0;
  output_attribs->depth_size = attributes.depth ? 24 : 0;
  output_attribs->stencil_size = attributes.stencil ? 8 : 0;
  output_attribs->samples = attributes.antialias ? 4 : 0;
  output_attribs->sample_buffers = attributes.antialias ? 1 : 0;
  output_attribs->fail_if_major_perf_caveat =
      attributes.failIfMajorPerformanceCaveat;
  output_attribs->bind_generates_resource = false;
  output_attribs->es3_context_required =
      (attributes.webGL && attributes.webGLVersion == 2);
}

}  // namespace gpu_blink