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// Copyright (c) 2012 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 "base/callback.h"
#include "base/memory/shared_memory.h"
#include "gpu/command_buffer/common/command_buffer.h"
#include "gpu/command_buffer/common/command_buffer_shared.h"
namespace gpu {
class TransferBufferManagerInterface;
class GPU_EXPORT CommandBufferServiceBase : public CommandBuffer {
public:
// Sets the current get offset. This can be called from any thread.
virtual void SetGetOffset(int32 get_offset) = 0;
// Get the transfer buffer associated with an ID. Returns a null buffer for
// ID 0.
virtual scoped_refptr<gpu::Buffer> GetTransferBuffer(int32 id) = 0;
// Allows the reader to update the current token value.
virtual void SetToken(int32 token) = 0;
// Allows the reader to set the current parse error.
virtual void SetParseError(error::Error) = 0;
// Allows the reader to set the current context lost reason.
// NOTE: if calling this in conjunction with SetParseError,
// call this first.
virtual void SetContextLostReason(error::ContextLostReason) = 0;
};
// An object that implements a shared memory command buffer and a synchronous
// API to manage the put and get pointers.
class GPU_EXPORT CommandBufferService : public CommandBufferServiceBase {
public:
typedef base::Callback<bool(int32)> GetBufferChangedCallback;
explicit CommandBufferService(
TransferBufferManagerInterface* transfer_buffer_manager);
~CommandBufferService() override;
// CommandBuffer implementation:
bool Initialize() override;
State GetLastState() override;
int32 GetLastToken() override;
void Flush(int32 put_offset) override;
void WaitForTokenInRange(int32 start, int32 end) override;
void WaitForGetOffsetInRange(int32 start, int32 end) override;
void SetGetBuffer(int32 transfer_buffer_id) override;
scoped_refptr<Buffer> CreateTransferBuffer(size_t size, int32* id) override;
void DestroyTransferBuffer(int32 id) override;
// CommandBufferServiceBase implementation:
void SetGetOffset(int32 get_offset) override;
scoped_refptr<Buffer> GetTransferBuffer(int32 id) override;
void SetToken(int32 token) override;
void SetParseError(error::Error error) override;
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);
// Setup the shared memory that shared state should be copied into.
void SetSharedStateBuffer(scoped_ptr<BufferBacking> shared_state_buffer);
// Copy the current state into the shared state transfer buffer.
void UpdateState();
// Registers an existing shared memory object and get an ID that can be used
// to identify it in the command buffer.
bool RegisterTransferBuffer(int32 id, scoped_ptr<BufferBacking> buffer);
private:
int32 ring_buffer_id_;
scoped_refptr<Buffer> ring_buffer_;
scoped_ptr<BufferBacking> shared_state_buffer_;
CommandBufferSharedState* shared_state_;
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_;
TransferBufferManagerInterface* transfer_buffer_manager_;
int32 token_;
uint32 generation_;
error::Error error_;
error::ContextLostReason context_lost_reason_;
DISALLOW_COPY_AND_ASSIGN(CommandBufferService);
};
} // namespace gpu
#endif // GPU_COMMAND_BUFFER_SERVICE_COMMAND_BUFFER_SERVICE_H_
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