gpu: Thread-safe command buffer state lookup.

gpu/command_buffer/service/command_buffer_service.h

 // 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 <stddef.h>
 #include <stdint.h>
 
 #include <memory>
 
 #include "base/callback.h"
 #include "base/macros.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_t get_offset) = 0;
 
+  // Set the release count for the last fence sync seen in the command stream.
+  virtual void SetReleaseCount(uint64_t release_count) = 0;
+
   // Get the transfer buffer associated with an ID. Returns a null buffer for
   // ID 0.
   virtual scoped_refptr<gpu::Buffer> GetTransferBuffer(int32_t id) = 0;
 
   // Allows the reader to update the current token value.
   virtual void SetToken(int32_t token) = 0;
 
   // Allows the reader to set the current parse error.
   virtual void SetParseError(error::Error) = 0;
 
@@ skipping 10 matching lines @@
 // API to manage the put and get pointers.
 class GPU_EXPORT CommandBufferService : public CommandBufferServiceBase {
  public:
   typedef base::Callback<bool(int32_t)> GetBufferChangedCallback;
   explicit CommandBufferService(
       TransferBufferManagerInterface* transfer_buffer_manager);
   ~CommandBufferService() override;
 
   // CommandBuffer implementation:
   State GetLastState() override;
-  int32_t GetLastToken() override;
   void Flush(int32_t put_offset) override;
   void OrderingBarrier(int32_t put_offset) override;
-  void WaitForTokenInRange(int32_t start, int32_t end) override;
-  void WaitForGetOffsetInRange(int32_t start, int32_t end) override;
+  State WaitForTokenInRange(int32_t start, int32_t end) override;
+  State WaitForGetOffsetInRange(int32_t start, int32_t end) override;
   void SetGetBuffer(int32_t transfer_buffer_id) override;
   scoped_refptr<Buffer> CreateTransferBuffer(size_t size, int32_t* id) override;
   void DestroyTransferBuffer(int32_t id) override;
 
   // CommandBufferServiceBase implementation:
   void SetGetOffset(int32_t get_offset) override;
+  void SetReleaseCount(uint64_t release_count) override;
   scoped_refptr<Buffer> GetTransferBuffer(int32_t id) override;
   void SetToken(int32_t token) override;
   void SetParseError(error::Error error) override;
   void SetContextLostReason(error::ContextLostReason) override;
   int32_t GetPutOffset() 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.
@@ skipping 25 matching lines @@
   std::unique_ptr<BufferBacking> shared_state_buffer_;
   CommandBufferSharedState* shared_state_;
   int32_t num_entries_;
   int32_t get_offset_;
   int32_t put_offset_;
   base::Closure put_offset_change_callback_;
   GetBufferChangedCallback get_buffer_change_callback_;
   base::Closure parse_error_callback_;
   scoped_refptr<TransferBufferManagerInterface> transfer_buffer_manager_;
   int32_t token_;
+  uint64_t release_count_;
   uint32_t 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_