gpu: Implement idle async pixel transfers.

gpu/command_buffer/service/gles2_cmd_decoder.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/gles2_cmd_decoder.h"
 
 #include <stdio.h>
 
 #include <algorithm>
 #include <list>
@@ skipping 617 matching lines @@
   virtual void RestoreFramebufferBindings() const OVERRIDE;
   virtual void RestoreTextureState(unsigned service_id) const OVERRIDE;
 
   virtual QueryManager* GetQueryManager() OVERRIDE {
     return query_manager_.get();
   }
   virtual VertexArrayManager* GetVertexArrayManager() OVERRIDE {
     return vertex_array_manager_.get();
   }
   virtual bool ProcessPendingQueries() OVERRIDE;
+  virtual bool HasMoreIdleWork() OVERRIDE;
+  virtual void PerformIdleWork() OVERRIDE;
 
   virtual void SetResizeCallback(
       const base::Callback<void(gfx::Size)>& callback) OVERRIDE;
 
   virtual void SetMsgCallback(const MsgCallback& callback) OVERRIDE;
   virtual void SetShaderCacheCallback(
       const ShaderCacheCallback& callback) OVERRIDE;
   virtual void SetWaitSyncPointCallback(
       const WaitSyncPointCallback& callback) OVERRIDE;
 
@@ skipping 2219 matching lines @@
 
 void GLES2DecoderImpl::ProcessFinishedAsyncTransfers() {
   if (engine() && query_manager_.get())
     query_manager_->ProcessPendingTransferQueries();
 
   // TODO(epenner): Is there a better place to do this?
   // This needs to occur before we execute any batch of commands
   // from the client, as the client may have recieved an async
   // completion while issuing those commands.
   // "DidFlushStart" would be ideal if we had such a callback.
+  // TODO(reveman): We should avoid using a bool return value to determine
+  // if we need to restore some state. crbug.com/196303
   if (async_pixel_transfer_delegate_->BindCompletedAsyncTransfers())
     RestoreCurrentTexture2DBindings();
 }
 
 void GLES2DecoderImpl::ReleaseCurrent() {
   if (context_.get())
     context_->ReleaseCurrent(surface_.get());
 }
 
 void GLES2DecoderImpl::RestoreCurrentRenderbufferBindings() {
@@ skipping 6395 matching lines @@
 bool GLES2DecoderImpl::ProcessPendingQueries() {
   if (query_manager_.get() == NULL) {
     return false;
   }
   if (!query_manager_->ProcessPendingQueries()) {
     current_decoder_error_ = error::kOutOfBounds;
   }
   return query_manager_->HavePendingQueries();
 }
 
+bool GLES2DecoderImpl::HasMoreIdleWork() {
+  return async_pixel_transfer_delegate_->NeedsProcessMorePendingTransfers();
+}
+
+void GLES2DecoderImpl::PerformIdleWork() {
+  if (!async_pixel_transfer_delegate_->NeedsProcessMorePendingTransfers())
+    return;
+  // TODO(reveman): We should avoid using a bool return value to determine
+  // if we need to restore some state. crbug.com/196303
+  if (async_pixel_transfer_delegate_->ProcessMorePendingTransfers())
+    RestoreCurrentTexture2DBindings();
+  ProcessFinishedAsyncTransfers();
+}
+
 error::Error GLES2DecoderImpl::HandleBeginQueryEXT(
     uint32 immediate_data_size, const cmds::BeginQueryEXT& c) {
   GLenum target = static_cast<GLenum>(c.target);
   GLuint client_id = static_cast<GLuint>(c.id);
   int32 sync_shm_id = static_cast<int32>(c.sync_data_shm_id);
   uint32 sync_shm_offset = static_cast<uint32>(c.sync_data_shm_offset);
 
   switch (target) {
     case GL_COMMANDS_ISSUED_CHROMIUM:
     case GL_LATENCY_QUERY_CHROMIUM:
@@ skipping 1137 matching lines @@
   return error::kNoError;
 }
 
 // Include the auto-generated part of this file. We split this because it means
 // we can easily edit the non-auto generated parts right here in this file
 // instead of having to edit some template or the code generator.
 #include "gpu/command_buffer/service/gles2_cmd_decoder_autogen.h"
 
 }  // namespace gles2
 }  // namespace gpu