RendererGLContext supports reparenting a GL context.

content/common/gpu/gpu_command_buffer_stub.cc

 // Copyright (c) 2011 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.
 
 #if defined(ENABLE_GPU)
 
 #include "base/bind.h"
 #include "base/debug/trace_event.h"
 #include "base/process_util.h"
 #include "base/shared_memory.h"
@@ skipping 10 matching lines @@
 
 #if defined(OS_WIN)
 #include "base/win/wrapped_window_proc.h"
 #endif
 
 using gpu::Buffer;
 
 GpuCommandBufferStub::GpuCommandBufferStub(
     GpuChannel* channel,
     gfx::PluginWindowHandle handle,
-    GpuCommandBufferStub* parent,
     const gfx::Size& size,
     const gpu::gles2::DisallowedExtensions& disallowed_extensions,
     const std::string& allowed_extensions,
     const std::vector<int32>& attribs,
-    uint32 parent_texture_id,
     int32 route_id,
     int32 renderer_id,
     int32 render_view_id,
     GpuWatchdog* watchdog)
     : channel_(channel),
       handle_(handle),
-      parent_(
-          parent ? parent->AsWeakPtr() : base::WeakPtr<GpuCommandBufferStub>()),
       initial_size_(size),
       disallowed_extensions_(disallowed_extensions),
       allowed_extensions_(allowed_extensions),
       requested_attribs_(attribs),
-      parent_texture_id_(parent_texture_id),
       route_id_(route_id),
       last_flush_count_(0),
       renderer_id_(renderer_id),
       render_view_id_(render_view_id),
       watchdog_(watchdog),
       task_factory_(ALLOW_THIS_IN_INITIALIZER_LIST(this)) {
 }
 
 GpuCommandBufferStub::~GpuCommandBufferStub() {
   if (scheduler_.get()) {
@@ skipping 15 matching lines @@
     deferred_messages_.push(new IPC::Message(message));
     return true;
   }
 
   // Always use IPC_MESSAGE_HANDLER_DELAY_REPLY for synchronous message handlers
   // here. This is so the reply can be delayed if the scheduler is unscheduled.
   bool handled = true;
   IPC_BEGIN_MESSAGE_MAP(GpuCommandBufferStub, message)
     IPC_MESSAGE_HANDLER_DELAY_REPLY(GpuCommandBufferMsg_Initialize,
                                     OnInitialize);
+    IPC_MESSAGE_HANDLER_DELAY_REPLY(GpuCommandBufferMsg_SetParent,
+                                    OnSetParent);
     IPC_MESSAGE_HANDLER_DELAY_REPLY(GpuCommandBufferMsg_GetState, OnGetState);
     IPC_MESSAGE_HANDLER_DELAY_REPLY(GpuCommandBufferMsg_Flush, OnFlush);
     IPC_MESSAGE_HANDLER(GpuCommandBufferMsg_AsyncFlush, OnAsyncFlush);
     IPC_MESSAGE_HANDLER_DELAY_REPLY(GpuCommandBufferMsg_CreateTransferBuffer,
                                     OnCreateTransferBuffer);
     IPC_MESSAGE_HANDLER_DELAY_REPLY(GpuCommandBufferMsg_RegisterTransferBuffer,
                                     OnRegisterTransferBuffer);
     IPC_MESSAGE_HANDLER_DELAY_REPLY(GpuCommandBufferMsg_DestroyTransferBuffer,
                                     OnDestroyTransferBuffer);
     IPC_MESSAGE_HANDLER_DELAY_REPLY(GpuCommandBufferMsg_GetTransferBuffer,
@@ skipping 30 matching lines @@
                                    false,
                                    channel_->renderer_process());
 #else
   // POSIX receives a dup of the shared memory handle and closes the dup when
   // this variable goes out of scope.
   base::SharedMemory shared_memory(ring_buffer, false);
 #endif
 
   // Initialize the CommandBufferService and GpuScheduler.
   if (command_buffer_->Initialize(&shared_memory, size)) {
-    gpu::GpuScheduler* parent_processor =
-        parent_ ? parent_->scheduler_.get() : NULL;
     scheduler_.reset(new gpu::GpuScheduler(command_buffer_.get(),
                                            channel_,
                                            NULL));
     if (scheduler_->Initialize(
         handle_,
         initial_size_,
         disallowed_extensions_,
         allowed_extensions_.c_str(),
         requested_attribs_,
-        parent_processor,
-        parent_texture_id_,
         channel_->share_group())) {
       command_buffer_->SetPutOffsetChangeCallback(
           NewCallback(scheduler_.get(),
                       &gpu::GpuScheduler::PutChanged));
       command_buffer_->SetParseErrorCallback(
           NewCallback(this, &GpuCommandBufferStub::OnParseError));
       scheduler_->SetSwapBuffersCallback(
           NewCallback(this, &GpuCommandBufferStub::OnSwapBuffers));
       scheduler_->SetLatchCallback(base::Bind(
           &GpuChannel::OnLatchCallback, base::Unretained(channel_), route_id_));
@@ skipping 24 matching lines @@
     } else {
       scheduler_.reset();
       command_buffer_.reset();
     }
   }
 
   GpuCommandBufferMsg_Initialize::WriteReplyParams(reply_message, result);
   Send(reply_message);
 }
 
+void GpuCommandBufferStub::OnSetParent(int32 parent_route_id,
+                                       uint32 parent_texture_id,
+                                       IPC::Message* reply_message) {
+  bool result = false;
+
+  if (parent_route_id == MSG_ROUTING_NONE) {
+    result = scheduler_->SetParent(NULL, 0);
+  } else {
+    GpuCommandBufferStub* parent_stub = channel_->LookupCommandBuffer(
+        parent_route_id);
+    if (parent_stub) {
+      result = scheduler_->SetParent(parent_stub->scheduler_.get(),
+                                     parent_texture_id);
+    }
+  }
+
+  GpuCommandBufferMsg_SetParent::WriteReplyParams(reply_message, result);
+  Send(reply_message);
+}
+
 void GpuCommandBufferStub::OnGetState(IPC::Message* reply_message) {
   gpu::CommandBuffer::State state = command_buffer_->GetState();
   if (state.error == gpu::error::kLostContext &&
       gfx::GLContext::LosesAllContextsOnContextLost())
     channel_->LoseAllContexts();
 
   GpuCommandBufferMsg_GetState::WriteReplyParams(reply_message, state);
   Send(reply_message);
 }
 
@@ skipping 262 matching lines @@
       gfx::GLContext::LosesAllContextsOnContextLost()) {
     channel_->LoseAllContexts();
   } else {
     IPC::Message* msg = new GpuCommandBufferMsg_UpdateState(route_id_, state);
     msg->set_unblock(true);
     Send(msg);
   }
 }
 
 #endif  // defined(ENABLE_GPU)