Use shared D3D9 texture to transport the compositor's backing buffer to the browser...

gpu/command_buffer/service/gpu_scheduler.h

 // 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.
 
 #ifndef GPU_COMMAND_BUFFER_SERVICE_GPU_SCHEDULER_H_
 #define GPU_COMMAND_BUFFER_SERVICE_GPU_SCHEDULER_H_
 
+#include <queue>
+
 #include "base/callback.h"
 #include "base/memory/ref_counted.h"
 #include "base/memory/scoped_ptr.h"
+#include "base/memory/weak_ptr.h"
 #include "base/shared_memory.h"
 #include "gpu/command_buffer/common/command_buffer.h"
 #include "gpu/command_buffer/service/cmd_buffer_engine.h"
 #include "gpu/command_buffer/service/cmd_parser.h"
 #include "gpu/command_buffer/service/gles2_cmd_decoder.h"
 
 namespace gpu {
 
 // This class schedules commands that have been flushed. They are received via
 // a command buffer and forwarded to a command parser. TODO(apatrick): This
 // class should not know about the decoder. Do not add additional dependencies
 // on it.
-class GpuScheduler : public CommandBufferEngine {
+class GpuScheduler
+    : public CommandBufferEngine,
+      public base::SupportsWeakPtr<GpuScheduler> {
  public:
   GpuScheduler(CommandBuffer* command_buffer,
                gles2::GLES2Decoder* decoder,
                CommandParser* parser);
 
   virtual ~GpuScheduler();
 
   void PutChanged();
 
   // Sets whether commands should be processed by this scheduler. Setting to
@@ skipping 10 matching lines @@
   void SetScheduledCallback(Callback0::Type* scheduled_callback);
 
   // Implementation of CommandBufferEngine.
   virtual Buffer GetSharedMemoryBuffer(int32 shm_id);
   virtual void set_token(int32 token);
   virtual bool SetGetOffset(int32 offset);
   virtual int32 GetGetOffset();
 
   void SetCommandProcessedCallback(Callback0::Type* callback);
 
+  void DeferToFence(base::Closure task);
+
  private:
 
   // The GpuScheduler holds a weak reference to the CommandBuffer. The
   // CommandBuffer owns the GpuScheduler and holds a strong reference to it
   // through the ProcessCommands callback.
   CommandBuffer* command_buffer_;
 
   // Does not own decoder. TODO(apatrick): The GpuScheduler shouldn't need a
   // pointer to the decoder, it is only used to initialize the CommandParser,
   // which could be an argument to the constructor, and to determine the
   // reason for context lost.
   gles2::GLES2Decoder* decoder_;
 
   // TODO(apatrick): The GpuScheduler currently creates and owns the parser.
   // This should be an argument to the constructor.
   scoped_ptr<CommandParser> parser_;
 
   // Greater than zero if this is waiting to be rescheduled before continuing.
   int unscheduled_count_;
 
+  // The GpuScheduler will unschedule itself in the event that further GL calls
+  // are issued to it before all these fences have been crossed by the GPU.
+  struct UnscheduleFence {
+    UnscheduleFence();
+    ~UnscheduleFence();
+
+    uint32 fence;
+    base::Closure task;
+  };
+  std::queue<UnscheduleFence> unschedule_fences_;
+
   scoped_ptr<Callback0::Type> scheduled_callback_;
   scoped_ptr<Callback0::Type> command_processed_callback_;
 };
 
 }  // namespace gpu
 
 #endif  // GPU_COMMAND_BUFFER_SERVICE_GPU_SCHEDULER_H_