Refactor WebGraphicsContext3D to use WGC3D types which match corresponding GL...

chrome/renderer/webgraphicscontext3d_command_buffer_impl.cc

Index: chrome/renderer/webgraphicscontext3d_command_buffer_impl.cc
===================================================================
--- chrome/renderer/webgraphicscontext3d_command_buffer_impl.cc	(revision 72809)
+++ chrome/renderer/webgraphicscontext3d_command_buffer_impl.cc	(working copy)
@@ -24,6 +24,8 @@
 #include "chrome/renderer/render_view.h"
 #include "third_party/WebKit/Source/WebKit/chromium/public/WebView.h"
 
+#if defined(USE_WGC3D_TYPES)
+
 WebGraphicsContext3DCommandBufferImpl::WebGraphicsContext3DCommandBufferImpl()
     : context_(NULL),
       web_view_(NULL),
@@ -164,6 +166,982 @@
   return cached_height_;
 }
 
+bool WebGraphicsContext3DCommandBufferImpl::isGLES2Compliant() {
+  return true;
+}
+
+WebGLId WebGraphicsContext3DCommandBufferImpl::getPlatformTextureId() {
+  DCHECK(context_);
+  return ggl::GetParentTextureId(context_);
+}
+
+void WebGraphicsContext3DCommandBufferImpl::prepareTexture() {
+  // Copies the contents of the off-screen render target into the texture
+  // used by the compositor.
+  ggl::SwapBuffers(context_);
+}
+
+void WebGraphicsContext3DCommandBufferImpl::reshape(int width, int height) {
+  cached_width_ = width;
+  cached_height_ = height;
+  makeContextCurrent();
+
+  if (web_view_) {
+#if defined(OS_MACOSX)
+    ggl::ResizeOnscreenContext(context_, gfx::Size(width, height));
+#else
+    glResizeCHROMIUM(width, height);
+#endif
+  } else {
+    ggl::ResizeOffscreenContext(context_, gfx::Size(width, height));
+    // Force a SwapBuffers to get the framebuffer to resize.
+    ggl::SwapBuffers(context_);
+  }
+
+#ifdef FLIP_FRAMEBUFFER_VERTICALLY
+  scanline_.reset(new uint8[width * 4]);
+#endif  // FLIP_FRAMEBUFFER_VERTICALLY
+}
+
+WebGLId WebGraphicsContext3DCommandBufferImpl::createCompositorTexture(
+    WGC3Dsizei width, WGC3Dsizei height) {
+  makeContextCurrent();
+  return ggl::CreateParentTexture(context_, gfx::Size(width, height));
+}
+
+void WebGraphicsContext3DCommandBufferImpl::deleteCompositorTexture(
+    WebGLId parent_texture) {
+  makeContextCurrent();
+  ggl::DeleteParentTexture(context_, parent_texture);
+}
+
+#ifdef FLIP_FRAMEBUFFER_VERTICALLY
+void WebGraphicsContext3DCommandBufferImpl::FlipVertically(
+    uint8* framebuffer,
+    unsigned int width,
+    unsigned int height) {
+  uint8* scanline = scanline_.get();
+  if (!scanline)
+    return;
+  unsigned int row_bytes = width * 4;
+  unsigned int count = height / 2;
+  for (unsigned int i = 0; i < count; i++) {
+    uint8* row_a = framebuffer + i * row_bytes;
+    uint8* row_b = framebuffer + (height - i - 1) * row_bytes;
+    // TODO(kbr): this is where the multiplication of the alpha
+    // channel into the color buffer will need to occur if the
+    // user specifies the "premultiplyAlpha" flag in the context
+    // creation attributes.
+    memcpy(scanline, row_b, row_bytes);
+    memcpy(row_b, row_a, row_bytes);
+    memcpy(row_a, scanline, row_bytes);
+  }
+}
+#endif
+
+bool WebGraphicsContext3DCommandBufferImpl::readBackFramebuffer(
+    unsigned char* pixels,
+    size_t buffer_size) {
+  if (buffer_size != static_cast<size_t>(4 * width() * height())) {
+    return false;
+  }
+
+  makeContextCurrent();
+
+  // Earlier versions of this code used the GPU to flip the
+  // framebuffer vertically before reading it back for compositing
+  // via software. This code was quite complicated, used a lot of
+  // GPU memory, and didn't provide an obvious speedup. Since this
+  // vertical flip is only a temporary solution anyway until Chrome
+  // is fully GPU composited, it wasn't worth the complexity.
+
+  bool mustRestoreFBO = (bound_fbo_ != 0);
+  if (mustRestoreFBO) {
+    glBindFramebuffer(GL_FRAMEBUFFER, 0);
+  }
+  glReadPixels(0, 0, cached_width_, cached_height_,
+               GL_RGBA, GL_UNSIGNED_BYTE, pixels);
+
+  // Swizzle red and blue channels
+  // TODO(kbr): expose GL_BGRA as extension
+  for (size_t i = 0; i < buffer_size; i += 4) {
+    std::swap(pixels[i], pixels[i + 2]);
+  }
+
+  if (mustRestoreFBO) {
+    glBindFramebuffer(GL_FRAMEBUFFER, bound_fbo_);
+  }
+
+#ifdef FLIP_FRAMEBUFFER_VERTICALLY
+  if (pixels) {
+    FlipVertically(pixels, cached_width_, cached_height_);
+  }
+#endif
+
+  return true;
+}
+
+void WebGraphicsContext3DCommandBufferImpl::synthesizeGLError(
+    WGC3Denum error) {
+  if (find(synthetic_errors_.begin(), synthetic_errors_.end(), error) ==
+      synthetic_errors_.end()) {
+    synthetic_errors_.push_back(error);
+  }
+}
+
+void* WebGraphicsContext3DCommandBufferImpl::mapBufferSubDataCHROMIUM(
+    WGC3Denum target,
+    WGC3Dintptr offset,
+    WGC3Dsizeiptr size,
+    WGC3Denum access) {
+  return glMapBufferSubDataCHROMIUM(target, offset, size, access);
+}
+
+void WebGraphicsContext3DCommandBufferImpl::unmapBufferSubDataCHROMIUM(
+    const void* mem) {
+  return glUnmapBufferSubDataCHROMIUM(mem);
+}
+
+void* WebGraphicsContext3DCommandBufferImpl::mapTexSubImage2DCHROMIUM(
+    WGC3Denum target,
+    WGC3Dint level,
+    WGC3Dint xoffset,
+    WGC3Dint yoffset,
+    WGC3Dsizei width,
+    WGC3Dsizei height,
+    WGC3Denum format,
+    WGC3Denum type,
+    WGC3Denum access) {
+  return glMapTexSubImage2DCHROMIUM(
+      target, level, xoffset, yoffset, width, height, format, type, access);
+}
+
+void WebGraphicsContext3DCommandBufferImpl::unmapTexSubImage2DCHROMIUM(
+    const void* mem) {
+  glUnmapTexSubImage2DCHROMIUM(mem);
+}
+
+void WebGraphicsContext3DCommandBufferImpl::copyTextureToParentTextureCHROMIUM(
+    WebGLId texture, WebGLId parentTexture) {
+  copyTextureToCompositor(texture, parentTexture);
+}
+
+WebKit::WebString WebGraphicsContext3DCommandBufferImpl::
+    getRequestableExtensionsCHROMIUM() {
+  return WebKit::WebString::fromUTF8(glGetRequestableExtensionsCHROMIUM());
+}
+
+void WebGraphicsContext3DCommandBufferImpl::requestExtensionCHROMIUM(
+    const char* extension) {
+  glRequestExtensionCHROMIUM(extension);
+}
+
+void WebGraphicsContext3DCommandBufferImpl::blitFramebufferCHROMIUM(
+    WGC3Dint srcX0, WGC3Dint srcY0, WGC3Dint srcX1, WGC3Dint srcY1,
+    WGC3Dint dstX0, WGC3Dint dstY0, WGC3Dint dstX1, WGC3Dint dstY1,
+    WGC3Dbitfield mask, WGC3Denum filter) {
+  glBlitFramebufferEXT(srcX0, srcY0, srcX1, srcY1,
+                       dstX0, dstY0, dstX1, dstY1,
+                       mask, filter);
+}
+
+void WebGraphicsContext3DCommandBufferImpl::
+    renderbufferStorageMultisampleCHROMIUM(
+        WGC3Denum target, WGC3Dsizei samples, WGC3Denum internalformat,
+        WGC3Dsizei width, WGC3Dsizei height) {
+  glRenderbufferStorageMultisampleEXT(target, samples, internalformat,
+                                      width, height);
+}
+
+// Helper macros to reduce the amount of code.
+
+#define DELEGATE_TO_GL(name, glname)                                    \
+void WebGraphicsContext3DCommandBufferImpl::name() {                    \
+  makeContextCurrent();                                                 \
+  gl##glname();                                                         \
+}
+
+#define DELEGATE_TO_GL_1(name, glname, t1)                              \
+void WebGraphicsContext3DCommandBufferImpl::name(t1 a1) {               \
+  makeContextCurrent();                                                 \
+  gl##glname(a1);                                                       \
+}
+
+#define DELEGATE_TO_GL_1R(name, glname, t1, rt)                         \
+rt WebGraphicsContext3DCommandBufferImpl::name(t1 a1) {                 \
+  makeContextCurrent();                                                 \
+  return gl##glname(a1);                                                \
+}
+
+#define DELEGATE_TO_GL_1RB(name, glname, t1, rt)                        \
+rt WebGraphicsContext3DCommandBufferImpl::name(t1 a1) {                 \
+  makeContextCurrent();                                                 \
+  return gl##glname(a1) ? true : false;                                 \
+}
+
+#define DELEGATE_TO_GL_2(name, glname, t1, t2)                          \
+void WebGraphicsContext3DCommandBufferImpl::name(t1 a1, t2 a2) {        \
+  makeContextCurrent();                                                 \
+  gl##glname(a1, a2);                                                   \
+}
+
+#define DELEGATE_TO_GL_2R(name, glname, t1, t2, rt)                     \
+rt WebGraphicsContext3DCommandBufferImpl::name(t1 a1, t2 a2) {          \
+  makeContextCurrent();                                                 \
+  return gl##glname(a1, a2);                                            \
+}
+
+#define DELEGATE_TO_GL_3(name, glname, t1, t2, t3)                      \
+void WebGraphicsContext3DCommandBufferImpl::name(t1 a1, t2 a2, t3 a3) { \
+  makeContextCurrent();                                                 \
+  gl##glname(a1, a2, a3);                                               \
+}
+
+#define DELEGATE_TO_GL_4(name, glname, t1, t2, t3, t4)                  \
+void WebGraphicsContext3DCommandBufferImpl::name(t1 a1, t2 a2, t3 a3, t4 a4) { \
+  makeContextCurrent();                                                 \
+  gl##glname(a1, a2, a3, a4);                                           \
+}
+
+#define DELEGATE_TO_GL_5(name, glname, t1, t2, t3, t4, t5)              \
+void WebGraphicsContext3DCommandBufferImpl::name(t1 a1, t2 a2, t3 a3,   \
+                                                 t4 a4, t5 a5) {        \
+  makeContextCurrent();                                                 \
+  gl##glname(a1, a2, a3, a4, a5);                                       \
+}
+
+#define DELEGATE_TO_GL_6(name, glname, t1, t2, t3, t4, t5, t6)          \
+void WebGraphicsContext3DCommandBufferImpl::name(t1 a1, t2 a2, t3 a3,   \
+                                                 t4 a4, t5 a5, t6 a6) { \
+  makeContextCurrent();                                                 \
+  gl##glname(a1, a2, a3, a4, a5, a6);                                   \
+}
+
+#define DELEGATE_TO_GL_7(name, glname, t1, t2, t3, t4, t5, t6, t7)      \
+void WebGraphicsContext3DCommandBufferImpl::name(t1 a1, t2 a2, t3 a3,   \
+                                                 t4 a4, t5 a5, t6 a6, t7 a7) { \
+  makeContextCurrent();                                                 \
+  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 WebGraphicsContext3DCommandBufferImpl::name(t1 a1, t2 a2, t3 a3,   \
+                                                 t4 a4, t5 a5, t6 a6,   \
+                                                 t7 a7, t8 a8) {        \
+  makeContextCurrent();                                                 \
+  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 WebGraphicsContext3DCommandBufferImpl::name(t1 a1, t2 a2, t3 a3,   \
+                                                 t4 a4, t5 a5, t6 a6,   \
+                                                 t7 a7, t8 a8, t9 a9) { \
+  makeContextCurrent();                                                 \
+  gl##glname(a1, a2, a3, a4, a5, a6, a7, a8, a9);                       \
+}
+
+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)
+
+void WebGraphicsContext3DCommandBufferImpl::bindFramebuffer(
+    WGC3Denum target,
+    WebGLId framebuffer) {
+  makeContextCurrent();
+  glBindFramebuffer(target, framebuffer);
+  bound_fbo_ = framebuffer;
+}
+
+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(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 WebGraphicsContext3DCommandBufferImpl::drawElements(WGC3Denum mode,
+                                                         WGC3Dsizei count,
+                                                         WGC3Denum type,
+                                                         WGC3Dintptr offset) {
+  makeContextCurrent();
+  glDrawElements(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)
+
+DELEGATE_TO_GL(finish, Finish)
+
+DELEGATE_TO_GL(flush, 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 WebGraphicsContext3DCommandBufferImpl::getActiveAttrib(
+    WebGLId program, WGC3Duint index, ActiveInfo& info) {
+  makeContextCurrent();
+  if (!program) {
+    synthesizeGLError(GL_INVALID_VALUE);
+    return false;
+  }
+  GLint max_name_length = -1;
+  glGetProgramiv(program, GL_ACTIVE_ATTRIBUTE_MAX_LENGTH, &max_name_length);
+  if (max_name_length < 0)
+    return false;
+  scoped_array<GLchar> name(new GLchar[max_name_length]);
+  if (!name.get()) {
+    synthesizeGLError(GL_OUT_OF_MEMORY);
+    return false;
+  }
+  GLsizei length = 0;
+  GLint size = -1;
+  GLenum type = 0;
+  glGetActiveAttrib(program, index, max_name_length,
+                    &length, &size, &type, name.get());
+  if (size < 0) {
+    return false;
+  }
+  info.name = WebKit::WebString::fromUTF8(name.get(), length);
+  info.type = type;
+  info.size = size;
+  return true;
+}
+
+bool WebGraphicsContext3DCommandBufferImpl::getActiveUniform(
+    WebGLId program, WGC3Duint index, ActiveInfo& info) {
+  makeContextCurrent();
+  GLint max_name_length = -1;
+  glGetProgramiv(program, GL_ACTIVE_UNIFORM_MAX_LENGTH, &max_name_length);
+  if (max_name_length < 0)
+    return false;
+  scoped_array<GLchar> name(new GLchar[max_name_length]);
+  if (!name.get()) {
+    synthesizeGLError(GL_OUT_OF_MEMORY);
+    return false;
+  }
+  GLsizei length = 0;
+  GLint size = -1;
+  GLenum type = 0;
+  glGetActiveUniform(program, index, max_name_length,
+                     &length, &size, &type, name.get());
+  if (size < 0) {
+    return false;
+  }
+  info.name = WebKit::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*)
+
+WebKit::WebGraphicsContext3D::Attributes
+WebGraphicsContext3DCommandBufferImpl::getContextAttributes() {
+  return attributes_;
+}
+
+WGC3Denum WebGraphicsContext3DCommandBufferImpl::getError() {
+  if (synthetic_errors_.size() > 0) {
+    std::vector<WGC3Denum>::iterator iter = synthetic_errors_.begin();
+    WGC3Denum err = *iter;
+    synthetic_errors_.erase(iter);
+    return err;
+  }
+
+  makeContextCurrent();
+  return glGetError();
+}
+
+bool WebGraphicsContext3DCommandBufferImpl::isContextLost() {
+  return ggl::IsCommandBufferContextLost(context_);
+}
+
+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*)
+
+WebKit::WebString WebGraphicsContext3DCommandBufferImpl::getProgramInfoLog(
+    WebGLId program) {
+  makeContextCurrent();
+  GLint logLength = 0;
+  glGetProgramiv(program, GL_INFO_LOG_LENGTH, &logLength);
+  if (!logLength)
+    return WebKit::WebString();
+  scoped_array<GLchar> log(new GLchar[logLength]);
+  if (!log.get())
+    return WebKit::WebString();
+  GLsizei returnedLogLength = 0;
+  glGetProgramInfoLog(program, logLength, &returnedLogLength, log.get());
+  DCHECK_EQ(logLength, returnedLogLength + 1);
+  WebKit::WebString res =
+      WebKit::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*)
+
+WebKit::WebString WebGraphicsContext3DCommandBufferImpl::getShaderInfoLog(
+    WebGLId shader) {
+  makeContextCurrent();
+  GLint logLength = 0;
+  glGetShaderiv(shader, GL_INFO_LOG_LENGTH, &logLength);
+  if (!logLength)
+    return WebKit::WebString();
+  scoped_array<GLchar> log(new GLchar[logLength]);
+  if (!log.get())
+    return WebKit::WebString();
+  GLsizei returnedLogLength = 0;
+  glGetShaderInfoLog(shader, logLength, &returnedLogLength, log.get());
+  DCHECK_EQ(logLength, returnedLogLength + 1);
+  WebKit::WebString res =
+      WebKit::WebString::fromUTF8(log.get(), returnedLogLength);
+  return res;
+}
+
+WebKit::WebString WebGraphicsContext3DCommandBufferImpl::getShaderSource(
+    WebGLId shader) {
+  makeContextCurrent();
+  GLint logLength = 0;
+  glGetShaderiv(shader, GL_SHADER_SOURCE_LENGTH, &logLength);
+  if (!logLength)
+    return WebKit::WebString();
+  scoped_array<GLchar> log(new GLchar[logLength]);
+  if (!log.get())
+    return WebKit::WebString();
+  GLsizei returnedLogLength = 0;
+  glGetShaderSource(shader, logLength, &returnedLogLength, log.get());
+  DCHECK_EQ(logLength, returnedLogLength + 1);
+  WebKit::WebString res =
+      WebKit::WebString::fromUTF8(log.get(), returnedLogLength);
+  return res;
+}
+
+WebKit::WebString WebGraphicsContext3DCommandBufferImpl::getString(
+    WGC3Denum name) {
+  makeContextCurrent();
+  return WebKit::WebString::fromUTF8(
+      reinterpret_cast<const char*>(glGetString(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 WebGraphicsContext3DCommandBufferImpl::getVertexAttribOffset(
+    WGC3Duint index, WGC3Denum pname) {
+  makeContextCurrent();
+  GLvoid* value = NULL;
+  // NOTE: If pname is ever a value that returns more then 1 element
+  // this will corrupt memory.
+  glGetVertexAttribPointerv(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*)
+
+void WebGraphicsContext3DCommandBufferImpl::releaseShaderCompiler() {
+}
+
+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 WebGraphicsContext3DCommandBufferImpl::shaderSource(
+    WebGLId shader, const WGC3Dchar* string) {
+  makeContextCurrent();
+  GLint length = strlen(string);
+  glShaderSource(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 WebGraphicsContext3DCommandBufferImpl::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;
+  }
+  makeContextCurrent();
+  glTexParameteri(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 WebGraphicsContext3DCommandBufferImpl::vertexAttribPointer(
+    WGC3Duint index, WGC3Dint size, WGC3Denum type, WGC3Dboolean normalized,
+    WGC3Dsizei stride, WGC3Dintptr offset) {
+  makeContextCurrent();
+
+  glVertexAttribPointer(index, size, type, normalized, stride,
+                        reinterpret_cast<void*>(
+                            static_cast<intptr_t>(offset)));
+}
+
+DELEGATE_TO_GL_4(viewport, Viewport,
+                 WGC3Dint, WGC3Dint, WGC3Dsizei, WGC3Dsizei)
+
+WebGLId WebGraphicsContext3DCommandBufferImpl::createBuffer() {
+  makeContextCurrent();
+  GLuint o;
+  glGenBuffers(1, &o);
+  return o;
+}
+
+WebGLId WebGraphicsContext3DCommandBufferImpl::createFramebuffer() {
+  makeContextCurrent();
+  GLuint o = 0;
+  glGenFramebuffers(1, &o);
+  return o;
+}
+
+WebGLId WebGraphicsContext3DCommandBufferImpl::createProgram() {
+  makeContextCurrent();
+  return glCreateProgram();
+}
+
+WebGLId WebGraphicsContext3DCommandBufferImpl::createRenderbuffer() {
+  makeContextCurrent();
+  GLuint o;
+  glGenRenderbuffers(1, &o);
+  return o;
+}
+
+DELEGATE_TO_GL_1R(createShader, CreateShader, WGC3Denum, WebGLId);
+
+WebGLId WebGraphicsContext3DCommandBufferImpl::createTexture() {
+  makeContextCurrent();
+  GLuint o;
+  glGenTextures(1, &o);
+  return o;
+}
+
+void WebGraphicsContext3DCommandBufferImpl::deleteBuffer(WebGLId buffer) {
+  makeContextCurrent();
+  glDeleteBuffers(1, &buffer);
+}
+
+void WebGraphicsContext3DCommandBufferImpl::deleteFramebuffer(
+    WebGLId framebuffer) {
+  makeContextCurrent();
+  glDeleteFramebuffers(1, &framebuffer);
+}
+
+void WebGraphicsContext3DCommandBufferImpl::deleteProgram(WebGLId program) {
+  makeContextCurrent();
+  glDeleteProgram(program);
+}
+
+void WebGraphicsContext3DCommandBufferImpl::deleteRenderbuffer(
+    WebGLId renderbuffer) {
+  makeContextCurrent();
+  glDeleteRenderbuffers(1, &renderbuffer);
+}
+
+void WebGraphicsContext3DCommandBufferImpl::deleteShader(WebGLId shader) {
+  makeContextCurrent();
+  glDeleteShader(shader);
+}
+
+void WebGraphicsContext3DCommandBufferImpl::deleteTexture(WebGLId texture) {
+  makeContextCurrent();
+  glDeleteTextures(1, &texture);
+}
+
+void WebGraphicsContext3DCommandBufferImpl::copyTextureToCompositor(
+    WebGLId texture, WebGLId parentTexture) {
+  makeContextCurrent();
+  glCopyTextureToParentTextureCHROMIUM(texture, parentTexture);
+  glFlush();
+}
+
+void WebGraphicsContext3DCommandBufferImpl::OnSwapBuffers() {
+  // This may be called after tear-down of the RenderView.
+  RenderView* renderview =
+      web_view_ ? RenderView::FromWebView(web_view_) : NULL;
+  if (renderview)
+    renderview->DidFlushPaint();
+}
+
+#else  // USE_WGC3D_TYPES
+
+WebGraphicsContext3DCommandBufferImpl::WebGraphicsContext3DCommandBufferImpl()
+    : context_(NULL),
+      web_view_(NULL),
+      cached_width_(0),
+      cached_height_(0),
+      bound_fbo_(0) {
+}
+
+WebGraphicsContext3DCommandBufferImpl::
+    ~WebGraphicsContext3DCommandBufferImpl() {
+  if (context_) {
+    ggl::DestroyContext(context_);
+  }
+}
+
+static const char* kWebGraphicsContext3DPerferredGLExtensions =
+    "GL_OES_packed_depth_stencil "
+    "GL_OES_depth24 "
+    "GL_CHROMIUM_webglsl";
+
+bool WebGraphicsContext3DCommandBufferImpl::initialize(
+    WebGraphicsContext3D::Attributes attributes,
+    WebKit::WebView* web_view,
+    bool render_directly_to_web_view) {
+  RenderThread* render_thread = RenderThread::current();
+  if (!render_thread)
+    return false;
+  GpuChannelHost* host = render_thread->EstablishGpuChannelSync();
+  if (!host)
+    return false;
+  DCHECK(host->state() == GpuChannelHost::kConnected);
+
+  // Convert WebGL context creation attributes into GGL/EGL size requests.
+  const int alpha_size = attributes.alpha ? 8 : 0;
+  const int depth_size = attributes.depth ? 24 : 0;
+  const int stencil_size = attributes.stencil ? 8 : 0;
+  const int samples = attributes.antialias ? 4 : 0;
+  const int sample_buffers = attributes.antialias ? 1 : 0;
+  const int32 attribs[] = {
+    ggl::GGL_ALPHA_SIZE, alpha_size,
+    ggl::GGL_DEPTH_SIZE, depth_size,
+    ggl::GGL_STENCIL_SIZE, stencil_size,
+    ggl::GGL_SAMPLES, samples,
+    ggl::GGL_SAMPLE_BUFFERS, sample_buffers,
+    ggl::GGL_NONE,
+  };
+
+  GPUInfo gpu_info = host->gpu_info();
+  UMA_HISTOGRAM_ENUMERATION(
+      "GPU.WebGraphicsContext3D_Init_CanLoseContext",
+      attributes.canRecoverFromContextLoss * 2 + gpu_info.can_lose_context(),
+      4);
+  if (attributes.canRecoverFromContextLoss == false) {
+    if (gpu_info.can_lose_context())
+      return false;
+  }
+
+  if (render_directly_to_web_view) {
+    RenderView* renderview = RenderView::FromWebView(web_view);
+    if (!renderview)
+      return false;
+
+    web_view_ = web_view;
+    context_ = ggl::CreateViewContext(
+        host,
+        renderview->routing_id(),
+        kWebGraphicsContext3DPerferredGLExtensions,
+        attribs);
+    if (context_) {
+      ggl::SetSwapBuffersCallback(
+          context_,
+          NewCallback(this,
+                      &WebGraphicsContext3DCommandBufferImpl::OnSwapBuffers));
+    }
+  } else {
+    bool compositing_enabled = !CommandLine::ForCurrentProcess()->HasSwitch(
+        switches::kDisableAcceleratedCompositing);
+    ggl::Context* parent_context = NULL;
+    // If GPU compositing is enabled we need to create a GL context that shares
+    // resources with the compositor's context.
+    if (compositing_enabled) {
+      // Asking for the WebGraphicsContext3D on the WebView will force one to
+      // be created if it doesn't already exist. When the compositor is created
+      // for the view it will use the same context.
+      WebKit::WebGraphicsContext3D* view_context =
+          web_view->graphicsContext3D();
+      if (view_context) {
+        WebGraphicsContext3DCommandBufferImpl* context_impl =
+            static_cast<WebGraphicsContext3DCommandBufferImpl*>(view_context);
+        parent_context = context_impl->context_;
+      }
+    }
+    context_ = ggl::CreateOffscreenContext(
+        host,
+        parent_context,
+        gfx::Size(1, 1),
+        kWebGraphicsContext3DPerferredGLExtensions,
+        attribs);
+    web_view_ = NULL;
+  }
+  if (!context_)
+    return false;
+  // TODO(gman): Remove this.
+  const CommandLine& command_line = *CommandLine::ForCurrentProcess();
+  if (command_line.HasSwitch(switches::kDisableGLSLTranslator)) {
+    DisableShaderTranslation(context_);
+  }
+
+  // Set attributes_ from created offscreen context.
+  {
+    attributes_ = attributes;
+    GLint alpha_bits = 0;
+    getIntegerv(GL_ALPHA_BITS, &alpha_bits);
+    attributes_.alpha = alpha_bits > 0;
+    GLint depth_bits = 0;
+    getIntegerv(GL_DEPTH_BITS, &depth_bits);
+    attributes_.depth = depth_bits > 0;
+    GLint stencil_bits = 0;
+    getIntegerv(GL_STENCIL_BITS, &stencil_bits);
+    attributes_.stencil = stencil_bits > 0;
+    GLint samples = 0;
+    getIntegerv(GL_SAMPLES, &samples);
+    attributes_.antialias = samples > 0;
+  }
+
+  return true;
+}
+
+bool WebGraphicsContext3DCommandBufferImpl::makeContextCurrent() {
+  return ggl::MakeCurrent(context_);
+}
+
+int WebGraphicsContext3DCommandBufferImpl::width() {
+  return cached_width_;
+}
+
+int WebGraphicsContext3DCommandBufferImpl::height() {
+  return cached_height_;
+}
+
 int WebGraphicsContext3DCommandBufferImpl::sizeInBytes(int type) {
   switch (type) {
     case GL_BYTE:
@@ -1035,4 +2013,6 @@
     renderview->DidFlushPaint();
 }
 
+#endif  // USE_WGC3D_TYPES
+
 #endif  // defined(ENABLE_GPU)