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// Copyright (c) 2009 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/linked_ptr.h"
#include "base/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:
CommandBufferService();
virtual ~CommandBufferService();
// CommandBuffer implementation:
virtual bool Initialize(int32 size);
virtual Buffer GetRingBuffer();
virtual State GetState();
virtual State Flush(int32 put_offset);
virtual void SetGetOffset(int32 get_offset);
virtual int32 CreateTransferBuffer(size_t size);
virtual void DestroyTransferBuffer(int32 id);
virtual Buffer GetTransferBuffer(int32 handle);
virtual void SetToken(int32 token);
virtual void SetParseError(error::Error error);
// Sets a callback that should be posted on another thread whenever the put
// offset is changed. 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. Avoiding
// the use of a synchronization primitive like a condition variable to
// synchronize reader and writer reduces the risk of deadlock.
// Takes ownership of callback. The callback is invoked on the plugin thread.
virtual void SetPutOffsetChangeCallback(Callback0::Type* callback);
private:
scoped_ptr< base::SharedMemory> ring_buffer_;
int32 size_;
int32 get_offset_;
int32 put_offset_;
scoped_ptr<Callback0::Type> put_offset_change_callback_;
std::vector<linked_ptr< base::SharedMemory> > registered_objects_;
std::set<int32> unused_registered_object_elements_;
int32 token_;
error::Error error_;
};
} // namespace gpu
#endif // GPU_COMMAND_BUFFER_SERVICE_COMMAND_BUFFER_SERVICE_H_
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