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117 lines
4.6 KiB
C++
117 lines
4.6 KiB
C++
// Copyright (c) 2012 The Chromium Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#ifndef GPU_COMMAND_BUFFER_SERVICE_COMMAND_BUFFER_SERVICE_H_
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#define GPU_COMMAND_BUFFER_SERVICE_COMMAND_BUFFER_SERVICE_H_
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#include "base/callback.h"
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#include "base/memory/shared_memory.h"
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#include "gpu/command_buffer/common/command_buffer.h"
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#include "gpu/command_buffer/common/command_buffer_shared.h"
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namespace gpu {
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class TransferBufferManagerInterface;
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class GPU_EXPORT CommandBufferServiceBase : public CommandBuffer {
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public:
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// Sets the current get offset. This can be called from any thread.
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virtual void SetGetOffset(int32 get_offset) = 0;
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// Get the transfer buffer associated with an ID. Returns a null buffer for
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// ID 0.
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virtual scoped_refptr<gpu::Buffer> GetTransferBuffer(int32 id) = 0;
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// Allows the reader to update the current token value.
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virtual void SetToken(int32 token) = 0;
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// Allows the reader to set the current parse error.
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virtual void SetParseError(error::Error) = 0;
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// Allows the reader to set the current context lost reason.
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// NOTE: if calling this in conjunction with SetParseError,
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// call this first.
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virtual void SetContextLostReason(error::ContextLostReason) = 0;
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// Allows the reader to obtain the current put offset.
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virtual int32 GetPutOffset() = 0;
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};
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// An object that implements a shared memory command buffer and a synchronous
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// API to manage the put and get pointers.
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class GPU_EXPORT CommandBufferService : public CommandBufferServiceBase {
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public:
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typedef base::Callback<bool(int32)> GetBufferChangedCallback;
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explicit CommandBufferService(
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TransferBufferManagerInterface* transfer_buffer_manager);
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~CommandBufferService() override;
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// CommandBuffer implementation:
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bool Initialize() override;
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State GetLastState() override;
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int32 GetLastToken() override;
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void Flush(int32 put_offset) override;
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void OrderingBarrier(int32 put_offset) override;
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void WaitForTokenInRange(int32 start, int32 end) override;
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void WaitForGetOffsetInRange(int32 start, int32 end) override;
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void SetGetBuffer(int32 transfer_buffer_id) override;
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scoped_refptr<Buffer> CreateTransferBuffer(size_t size, int32* id) override;
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void DestroyTransferBuffer(int32 id) override;
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// CommandBufferServiceBase implementation:
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void SetGetOffset(int32 get_offset) override;
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scoped_refptr<Buffer> GetTransferBuffer(int32 id) override;
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void SetToken(int32 token) override;
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void SetParseError(error::Error error) override;
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void SetContextLostReason(error::ContextLostReason) override;
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int32 GetPutOffset() override;
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// Sets a callback that is called whenever the put offset is changed. When
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// called with sync==true, the callback must not return until some progress
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// has been made (unless the command buffer is empty), i.e. the get offset
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// must have changed. It need not process the entire command buffer though.
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// This allows concurrency between the writer and the reader while giving the
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// writer a means of waiting for the reader to make some progress before
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// attempting to write more to the command buffer. Takes ownership of
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// callback.
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virtual void SetPutOffsetChangeCallback(const base::Closure& callback);
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// Sets a callback that is called whenever the get buffer is changed.
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virtual void SetGetBufferChangeCallback(
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const GetBufferChangedCallback& callback);
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virtual void SetParseErrorCallback(const base::Closure& callback);
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// Setup the shared memory that shared state should be copied into.
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void SetSharedStateBuffer(scoped_ptr<BufferBacking> shared_state_buffer);
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// Copy the current state into the shared state transfer buffer.
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void UpdateState();
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// Registers an existing shared memory object and get an ID that can be used
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// to identify it in the command buffer.
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bool RegisterTransferBuffer(int32 id, scoped_ptr<BufferBacking> buffer);
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private:
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int32 ring_buffer_id_;
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scoped_refptr<Buffer> ring_buffer_;
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scoped_ptr<BufferBacking> shared_state_buffer_;
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CommandBufferSharedState* shared_state_;
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int32 num_entries_;
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int32 get_offset_;
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int32 put_offset_;
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base::Closure put_offset_change_callback_;
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GetBufferChangedCallback get_buffer_change_callback_;
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base::Closure parse_error_callback_;
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TransferBufferManagerInterface* transfer_buffer_manager_;
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int32 token_;
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uint32 generation_;
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error::Error error_;
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error::ContextLostReason context_lost_reason_;
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DISALLOW_COPY_AND_ASSIGN(CommandBufferService);
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};
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} // namespace gpu
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#endif // GPU_COMMAND_BUFFER_SERVICE_COMMAND_BUFFER_SERVICE_H_
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