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// 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/unsafe_shared_memory_region.h"
#include "base/trace_event/memory_allocator_dump.h"
#include "gpu/gpu_export.h"
namespace gpu {
class GPU_EXPORT BufferBacking {
public:
virtual ~BufferBacking() = default;
virtual const base::UnsafeSharedMemoryRegion& shared_memory_region() const;
virtual base::UnguessableToken GetGUID() const;
virtual void* GetMemory() const = 0;
virtual uint32_t GetSize() const = 0;
};
class GPU_EXPORT SharedMemoryBufferBacking : public BufferBacking {
public:
SharedMemoryBufferBacking(
base::UnsafeSharedMemoryRegion shared_memory_region,
base::WritableSharedMemoryMapping shared_memory_mapping);
~SharedMemoryBufferBacking() override;
const base::UnsafeSharedMemoryRegion& shared_memory_region() const override;
base::UnguessableToken GetGUID() const override;
void* GetMemory() const override;
uint32_t GetSize() const override;
private:
base::UnsafeSharedMemoryRegion shared_memory_region_;
base::WritableSharedMemoryMapping shared_memory_mapping_;
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_; }
uint32_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_;
uint32_t size_;
DISALLOW_COPY_AND_ASSIGN(Buffer);
};
static inline std::unique_ptr<BufferBacking> MakeBackingFromSharedMemory(
base::UnsafeSharedMemoryRegion shared_memory_region,
base::WritableSharedMemoryMapping shared_memory_mapping) {
return std::make_unique<SharedMemoryBufferBacking>(
std::move(shared_memory_region), std::move(shared_memory_mapping));
}
static inline scoped_refptr<Buffer> MakeBufferFromSharedMemory(
base::UnsafeSharedMemoryRegion shared_memory_region,
base::WritableSharedMemoryMapping shared_memory_mapping) {
return new Buffer(MakeBackingFromSharedMemory(
std::move(shared_memory_region), std::move(shared_memory_mapping)));
}
// 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_
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