Replace context parenting by sharing through mailboxes

content/renderer/pepper/pepper_platform_context_3d_impl.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 "content/renderer/pepper/pepper_platform_context_3d_impl.h"
 
 #include "base/bind.h"
 #include "content/common/gpu/client/context_provider_command_buffer.h"
 #include "content/common/gpu/client/gpu_channel_host.h"
 #include "content/common/gpu/client/webgraphicscontext3d_command_buffer_impl.h"
@@ skipping 90 matching lines @@
       surface_size,
       share_buffer,
       "*",
       attribs,
       GURL::EmptyGURL(),
       gpu_preference);
   if (!command_buffer_)
     return false;
   if (!command_buffer_->Initialize())
     return false;
+  std::vector<gpu::Mailbox> names;
+  if (!command_buffer_->GenerateMailboxNames(1, &names))
+    return false;
+  DCHECK_EQ(names.size(), 1u);
+  mailbox_ = names[0];
+  if (!command_buffer_->ProduceFrontBuffer(mailbox_))
+    return false;
 
   command_buffer_->SetChannelErrorCallback(
       base::Bind(&PlatformContext3DImpl::OnContextLost,
                  weak_ptr_factory_.GetWeakPtr()));
   command_buffer_->SetOnConsoleMessageCallback(
       base::Bind(&PlatformContext3DImpl::OnConsoleMessage,
                  weak_ptr_factory_.GetWeakPtr()));
 
   return SetParentAndCreateBackingTextureIfNeeded();
 }
 
 bool PlatformContext3DImpl::SetParentAndCreateBackingTextureIfNeeded() {
   if (parent_context_provider_.get() &&
       !parent_context_provider_->DestroyedOnMainThread() && parent_texture_id_)
     return true;
 
   parent_context_provider_ =
       RenderThreadImpl::current()->OffscreenContextProviderForMainThread();
   parent_texture_id_ = 0;
   if (!parent_context_provider_.get())
     return false;
 
-  // Flush any remaining commands in the parent context to make sure the
-  // texture id accounting stays consistent.
   gpu::gles2::GLES2Implementation* parent_gles2 =
       parent_context_provider_->Context3d()->GetImplementation();
-  parent_gles2->helper()->CommandBufferHelper::Finish();
-  parent_texture_id_ = parent_gles2->MakeTextureId();
-
-  CommandBufferProxyImpl* parent_command_buffer =
-      parent_context_provider_->Context3d()->GetCommandBufferProxy();
-  if (!command_buffer_->SetParent(parent_command_buffer, parent_texture_id_))
-    return false;
-
+  parent_gles2->GenTextures(1, &parent_texture_id_);
+  parent_gles2->BindTexture(GL_TEXTURE_2D, parent_texture_id_);
+  parent_gles2->ConsumeTextureCHROMIUM(GL_TEXTURE_2D, mailbox_.name);
+  parent_gles2->ShallowFlushCHROMIUM();
   return true;
 }
 
 void PlatformContext3DImpl::DestroyParentContextProviderAndBackingTexture() {
   if (!parent_context_provider_.get())
     return;
 
   if (parent_texture_id_) {
-    // Flush any remaining commands in the parent context to make sure the
-    // texture id accounting stays consistent.
     gpu::gles2::GLES2Implementation* parent_gles2 =
         parent_context_provider_->Context3d()->GetImplementation();
-    parent_gles2->helper()->CommandBufferHelper::Finish();
-    parent_gles2->FreeTextureId(parent_texture_id_);
+    parent_gles2->DeleteTextures(1, &parent_texture_id_);
+    parent_gles2->ShallowFlushCHROMIUM();
     parent_texture_id_ = 0;
   }
 
   parent_context_provider_ = NULL;
 }
 
 unsigned PlatformContext3DImpl::GetBackingTextureId() {
   DCHECK(command_buffer_);
   return parent_texture_id_;
 }
@@ skipping 41 matching lines @@
 void PlatformContext3DImpl::OnConsoleMessage(const std::string& msg, int id) {
   DCHECK(command_buffer_);
 
   if (!console_message_callback_.is_null())
     console_message_callback_.Run(msg, id);
 }
 
 }  // namespace content
 
 #endif  // ENABLE_GPU