Revert "Revert 113479 - Revert "Revert 113250 - Add CommandBuffer::SetGetBuffer""

gpu/command_buffer/service/command_buffer_service.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_COMMAND_BUFFER_SERVICE_H_
 #define GPU_COMMAND_BUFFER_SERVICE_COMMAND_BUFFER_SERVICE_H_
 
 #include <set>
 #include <vector>
 
 #include "base/callback.h"
 #include "base/memory/linked_ptr.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/shared_memory.h"
 #include "base/task.h"
 #include "gpu/command_buffer/common/command_buffer.h"
 
 namespace gpu {
 
 // An object that implements a shared memory command buffer and a synchronous
 // API to manage the put and get pointers.
 class CommandBufferService : public CommandBuffer {
  public:
+  typedef base::Callback<bool(int32)> GetBufferChangedCallback;
   CommandBufferService();
   virtual ~CommandBufferService();
 
   // CommandBuffer implementation:
-  virtual bool Initialize(int32 size) OVERRIDE;
-  virtual bool Initialize(base::SharedMemory* buffer, int32 size) OVERRIDE;
-  virtual Buffer GetRingBuffer() OVERRIDE;
+  virtual bool Initialize() OVERRIDE;
   virtual State GetState() OVERRIDE;
   virtual State GetLastState() OVERRIDE;
   virtual void Flush(int32 put_offset) OVERRIDE;
   virtual State FlushSync(int32 put_offset, int32 last_known_get) OVERRIDE;
+  virtual void SetGetBuffer(int32 transfer_buffer_id) OVERRIDE;
   virtual void SetGetOffset(int32 get_offset) OVERRIDE;
   virtual int32 CreateTransferBuffer(size_t size, int32 id_request) OVERRIDE;
   virtual int32 RegisterTransferBuffer(base::SharedMemory* shared_memory,
                                        size_t size,
                                        int32 id_request) OVERRIDE;
   virtual void DestroyTransferBuffer(int32 id) OVERRIDE;
   virtual Buffer GetTransferBuffer(int32 handle) OVERRIDE;
   virtual void SetToken(int32 token) OVERRIDE;
   virtual void SetParseError(error::Error error) OVERRIDE;
   virtual void SetContextLostReason(error::ContextLostReason) OVERRIDE;
 
   // Sets a callback that is called whenever the put offset is changed. When
   // called with sync==true, the callback must not return until some progress
   // has been made (unless the command buffer is empty), i.e. the get offset
   // must have changed. It need not process the entire command buffer though.
   // This allows concurrency between the writer and the reader while giving the
   // writer a means of waiting for the reader to make some progress before
   // attempting to write more to the command buffer. Takes ownership of
   // callback.
   virtual void SetPutOffsetChangeCallback(const base::Closure& callback);
+  // Sets a callback that is called whenever the get buffer is changed.
+  virtual void SetGetBufferChangeCallback(
+      const GetBufferChangedCallback& callback);
   virtual void SetParseErrorCallback(const base::Closure& callback);
 
  private:
+  int32 ring_buffer_id_;
   Buffer ring_buffer_;
   int32 num_entries_;
   int32 get_offset_;
   int32 put_offset_;
   base::Closure put_offset_change_callback_;
+  GetBufferChangedCallback get_buffer_change_callback_;
   base::Closure parse_error_callback_;
   std::vector<Buffer> registered_objects_;
   std::set<int32> unused_registered_object_elements_;
   int32 token_;
   uint32 generation_;
   error::Error error_;
   error::ContextLostReason context_lost_reason_;
 };
 
 }  // namespace gpu
 
 #endif  // GPU_COMMAND_BUFFER_SERVICE_COMMAND_BUFFER_SERVICE_H_