Add command buffer support for GL_RGB CHROMIUM image emulation.

gpu/command_buffer/service/framebuffer_manager.cc

 // 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/command_buffer/service/framebuffer_manager.h"
 
 #include <stddef.h>
 #include <stdint.h>
 
 #include "base/logging.h"
@@ skipping 111 matching lines @@
                       std::string* signature) const override {
     DCHECK(signature);
     renderbuffer_->AddToSignature(signature);
   }
 
   bool FormsFeedbackLoop(TextureRef* /* texture */,
                          GLint /*level */) const override {
     return false;
   }
 
+  bool EmulatingRGB() const override { return false; }
+
  protected:
   ~RenderbufferAttachment() override {}
 
  private:
   scoped_refptr<Renderbuffer> renderbuffer_;
 
   DISALLOW_COPY_AND_ASSIGN(RenderbufferAttachment);
 };
 
 class TextureAttachment
@@ skipping 128 matching lines @@
                       std::string* signature) const override {
     DCHECK(signature);
     texture_manager->AddToSignature(
         texture_ref_.get(), target_, level_, signature);
   }
 
   bool FormsFeedbackLoop(TextureRef* texture, GLint level) const override {
     return texture == texture_ref_.get() && level == level_;
   }
 
+  bool EmulatingRGB() const override {
+    return texture_ref_->texture()->EmulatingRGB();
+  }
+
  protected:
   ~TextureAttachment() override {}
 
  private:
   scoped_refptr<TextureRef> texture_ref_;
   GLenum target_;
   GLint level_;
   GLsizei samples_;
   GLint layer_;
 
@@ skipping 240 matching lines @@
 }
 
 GLenum Framebuffer::GetReadBufferInternalFormat() const {
   if (read_buffer_ == GL_NONE)
     return 0;
   AttachmentMap::const_iterator it = attachments_.find(read_buffer_);
   if (it == attachments_.end()) {
     return 0;
   }
   const Attachment* attachment = it->second.get();
+  if (attachment->EmulatingRGB()) {
+    DCHECK_EQ(static_cast<GLenum>(GL_RGBA), attachment->internal_format());
+    return GL_RGB;
+  }
   return attachment->internal_format();
 }
 
 GLenum Framebuffer::GetReadBufferTextureType() const {
   if (read_buffer_ == GL_NONE)
     return 0;
   AttachmentMap::const_iterator it = attachments_.find(read_buffer_);
   if (it == attachments_.end()) {
     return 0;
   }
@@ skipping 291 matching lines @@
 
 bool FramebufferManager::IsComplete(
     Framebuffer* framebuffer) {
   DCHECK(framebuffer);
   return framebuffer->framebuffer_complete_state_count_id() ==
       framebuffer_state_change_count_;
 }
 
 }  // namespace gles2
 }  // namespace gpu