| // Copyright (c) 2014 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_COMMON_BUFFER_H_ |
| #define GPU_COMMAND_BUFFER_COMMON_BUFFER_H_ |
| |
| #include <stddef.h> |
| #include <stdint.h> |
| |
| #include <memory> |
| |
| #include "base/macros.h" |
| #include "base/memory/ref_counted.h" |
| #include "base/memory/shared_memory.h" |
| #include "base/trace_event/memory_allocator_dump.h" |
| #include "gpu/gpu_export.h" |
| |
| namespace base { |
| |
| class SharedMemory; |
| class SharedMemoryHandle; |
| |
| } // namespace base |
| |
| namespace gpu { |
| |
| class GPU_EXPORT BufferBacking { |
| public: |
| virtual ~BufferBacking() {} |
| virtual base::SharedMemoryHandle shared_memory_handle() const; |
| virtual void* GetMemory() const = 0; |
| virtual size_t GetSize() const = 0; |
| }; |
| |
| class GPU_EXPORT SharedMemoryBufferBacking : public BufferBacking { |
| public: |
| SharedMemoryBufferBacking(std::unique_ptr<base::SharedMemory> shared_memory, |
| size_t size); |
| ~SharedMemoryBufferBacking() override; |
| base::SharedMemoryHandle shared_memory_handle() const override; |
| void* GetMemory() const override; |
| size_t GetSize() const override; |
| base::SharedMemory* shared_memory() { return shared_memory_.get(); } |
| |
| private: |
| std::unique_ptr<base::SharedMemory> shared_memory_; |
| size_t size_; |
| DISALLOW_COPY_AND_ASSIGN(SharedMemoryBufferBacking); |
| }; |
| |
| // Buffer owns a piece of shared-memory of a certain size. |
| class GPU_EXPORT Buffer : public base::RefCountedThreadSafe<Buffer> { |
| public: |
| explicit Buffer(std::unique_ptr<BufferBacking> backing); |
| |
| BufferBacking* backing() const { return backing_.get(); } |
| void* memory() const { return memory_; } |
| size_t size() const { return size_; } |
| |
| // Returns NULL if the address overflows the memory. |
| void* GetDataAddress(uint32_t data_offset, uint32_t data_size) const; |
| |
| // Returns NULL if the address overflows the memory. |
| void* GetDataAddressAndSize(uint32_t data_offset, uint32_t* data_size) const; |
| |
| // Returns the remaining size of the buffer after an offset |
| uint32_t GetRemainingSize(uint32_t data_offset) const; |
| |
| private: |
| friend class base::RefCountedThreadSafe<Buffer>; |
| ~Buffer(); |
| |
| std::unique_ptr<BufferBacking> backing_; |
| void* memory_; |
| size_t size_; |
| |
| DISALLOW_COPY_AND_ASSIGN(Buffer); |
| }; |
| |
| static inline std::unique_ptr<BufferBacking> MakeBackingFromSharedMemory( |
| std::unique_ptr<base::SharedMemory> shared_memory, |
| size_t size) { |
| return std::unique_ptr<BufferBacking>( |
| new SharedMemoryBufferBacking(std::move(shared_memory), size)); |
| } |
| |
| static inline scoped_refptr<Buffer> MakeBufferFromSharedMemory( |
| std::unique_ptr<base::SharedMemory> shared_memory, |
| size_t size) { |
| return new Buffer( |
| MakeBackingFromSharedMemory(std::move(shared_memory), size)); |
| } |
| |
| // Generates GUID which can be used to trace buffer using an Id. |
| GPU_EXPORT base::trace_event::MemoryAllocatorDumpGuid GetBufferGUIDForTracing( |
| uint64_t tracing_process_id, |
| int32_t buffer_id); |
| |
| } // namespace gpu |
| |
| #endif // GPU_COMMAND_BUFFER_COMMON_BUFFER_H_ |