chromium/gpu/command_buffer/common/buffer.h

// Copyright 2014 The Chromium Authors
// 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/memory/raw_ptr.h"
#include "base/memory/ref_counted.h"
#include "base/memory/unsafe_shared_memory_region.h"
#include "base/trace_event/memory_allocator_dump.h"
#include "gpu/gpu_export.h"

namespace gpu {

class GPU_EXPORT BufferBacking { … };

class GPU_EXPORT MemoryBufferBacking : public BufferBacking { … };


class GPU_EXPORT SharedMemoryBufferBacking : public BufferBacking { … };

// Buffer owns a piece of shared-memory of a certain size.
class GPU_EXPORT Buffer : public base::RefCountedThreadSafe<Buffer> { … };

inline std::unique_ptr<BufferBacking> MakeBackingFromSharedMemory(
    base::UnsafeSharedMemoryRegion shared_memory_region,
    base::WritableSharedMemoryMapping shared_memory_mapping) { … }
inline scoped_refptr<Buffer> MakeBufferFromSharedMemory(
    base::UnsafeSharedMemoryRegion shared_memory_region,
    base::WritableSharedMemoryMapping shared_memory_mapping) { … }

inline scoped_refptr<Buffer> MakeMemoryBuffer(uint32_t size,
                                              uint32_t alignment = 0) { … }

// Generates a process unique buffer ID which can be safely used with
// GetBufferGUIDForTracing.
GPU_EXPORT int32_t GetNextBufferId();

// 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_