gpu: Defer reads from default framebuffer when needed.

gpu/command_buffer/service/gles2_cmd_decoder_autogen.h

 // 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.
 
 // This file is auto-generated from
 // gpu/command_buffer/build_gles2_cmd_buffer.py
 // DO NOT EDIT!
 
 // It is included by gles2_cmd_decoder.cc
 #ifndef GPU_COMMAND_BUFFER_SERVICE_GLES2_CMD_DECODER_AUTOGEN_H_
@@ skipping 234 matching lines @@
     return error::kOutOfBounds;
   }
   if (!validators_->frame_buffer_target.IsValid(target)) {
     SetGLErrorInvalidEnum("glCheckFramebufferStatus", target, "target");
     return error::kNoError;
   }
   *result_dst = DoCheckFramebufferStatus(target);
   return error::kNoError;
 }
 
+error::Error GLES2DecoderImpl::HandleClear(
+    uint32 immediate_data_size, const gles2::Clear& c) {
+  if (ShouldDeferDraws())
+    return error::kDeferCommandUntilLater;
+  GLbitfield mask = static_cast<GLbitfield>(c.mask);
+  DoClear(mask);
+  return error::kNoError;
+}
+
 error::Error GLES2DecoderImpl::HandleClearColor(
     uint32 immediate_data_size, const gles2::ClearColor& c) {
   GLclampf red = static_cast<GLclampf>(c.red);
   GLclampf green = static_cast<GLclampf>(c.green);
   GLclampf blue = static_cast<GLclampf>(c.blue);
   GLclampf alpha = static_cast<GLclampf>(c.alpha);
   if (state_.color_clear_red != red ||
       state_.color_clear_green != green ||
       state_.color_clear_blue != blue ||
       state_.color_clear_alpha != alpha) {
@@ skipping 130 matching lines @@
   if (data == NULL) {
     return error::kOutOfBounds;
   }
   DoCompressedTexSubImage2D(
       target, level, xoffset, yoffset, width, height, format, imageSize, data);
   return error::kNoError;
 }
 
 error::Error GLES2DecoderImpl::HandleCopyTexImage2D(
     uint32 immediate_data_size, const gles2::CopyTexImage2D& c) {
+  if (ShouldDeferReads())
+    return error::kDeferCommandUntilLater;
   GLenum target = static_cast<GLenum>(c.target);
   GLint level = static_cast<GLint>(c.level);
   GLenum internalformat = static_cast<GLenum>(c.internalformat);
   GLint x = static_cast<GLint>(c.x);
   GLint y = static_cast<GLint>(c.y);
   GLsizei width = static_cast<GLsizei>(c.width);
   GLsizei height = static_cast<GLsizei>(c.height);
   GLint border = static_cast<GLint>(c.border);
   if (!validators_->texture_target.IsValid(target)) {
     SetGLErrorInvalidEnum("glCopyTexImage2D", target, "target");
@@ skipping 16 matching lines @@
     SetGLError(
         GL_INVALID_VALUE, "glCopyTexImage2D", "border GL_INVALID_VALUE");
     return error::kNoError;
   }
   DoCopyTexImage2D(target, level, internalformat, x, y, width, height, border);
   return error::kNoError;
 }
 
 error::Error GLES2DecoderImpl::HandleCopyTexSubImage2D(
     uint32 immediate_data_size, const gles2::CopyTexSubImage2D& c) {
+  if (ShouldDeferReads())
+    return error::kDeferCommandUntilLater;
   GLenum target = static_cast<GLenum>(c.target);
   GLint level = static_cast<GLint>(c.level);
   GLint xoffset = static_cast<GLint>(c.xoffset);
   GLint yoffset = static_cast<GLint>(c.yoffset);
   GLint x = static_cast<GLint>(c.x);
   GLint y = static_cast<GLint>(c.y);
   GLsizei width = static_cast<GLsizei>(c.width);
   GLsizei height = static_cast<GLsizei>(c.height);
   if (!validators_->texture_target.IsValid(target)) {
     SetGLErrorInvalidEnum("glCopyTexSubImage2D", target, "target");
@@ skipping 2177 matching lines @@
   if (height < 0) {
     SetGLError(GL_INVALID_VALUE, "glViewport", "height < 0");
     return error::kNoError;
   }
   DoViewport(x, y, width, height);
   return error::kNoError;
 }
 
 error::Error GLES2DecoderImpl::HandleBlitFramebufferEXT(
     uint32 immediate_data_size, const gles2::BlitFramebufferEXT& c) {
+  if (ShouldDeferDraws() || ShouldDeferReads())
+    return error::kDeferCommandUntilLater;
   GLint srcX0 = static_cast<GLint>(c.srcX0);
   GLint srcY0 = static_cast<GLint>(c.srcY0);
   GLint srcX1 = static_cast<GLint>(c.srcX1);
   GLint srcY1 = static_cast<GLint>(c.srcY1);
   GLint dstX0 = static_cast<GLint>(c.dstX0);
   GLint dstY0 = static_cast<GLint>(c.dstY0);
   GLint dstX1 = static_cast<GLint>(c.dstX1);
   GLint dstY1 = static_cast<GLint>(c.dstY1);
   GLbitfield mask = static_cast<GLbitfield>(c.mask);
   GLenum filter = static_cast<GLenum>(c.filter);
@@ skipping 490 matching lines @@
         clear_state_dirty_ = true;
       }
       return false;
     default:
       NOTREACHED();
       return false;
   }
 }
 #endif  // GPU_COMMAND_BUFFER_SERVICE_GLES2_CMD_DECODER_AUTOGEN_H_