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// 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_old.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:
CommandBufferService();
virtual ~CommandBufferService();
// CommandBuffer implementation:
virtual bool Initialize(int32 size);
virtual bool Initialize(base::SharedMemory* buffer, int32 size);
virtual Buffer GetRingBuffer();
virtual State GetState();
virtual State GetLastState();
virtual void Flush(int32 put_offset);
virtual State FlushSync(int32 put_offset, int32 last_known_get);
virtual void SetGetOffset(int32 get_offset);
virtual int32 CreateTransferBuffer(size_t size, int32 id_request);
virtual int32 RegisterTransferBuffer(base::SharedMemory* shared_memory,
size_t size,
int32 id_request);
virtual void DestroyTransferBuffer(int32 id);
virtual Buffer GetTransferBuffer(int32 handle);
virtual void SetToken(int32 token);
virtual void SetParseError(error::Error error);
virtual void SetContextLostReason(error::ContextLostReason);
// 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(Callback0::Type* callback);
virtual void SetParseErrorCallback(Callback0::Type* callback);
private:
Buffer ring_buffer_;
int32 num_entries_;
int32 get_offset_;
int32 put_offset_;
scoped_ptr<Callback0::Type> put_offset_change_callback_;
scoped_ptr<Callback0::Type> 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_
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