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// 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_CLIENT_INTERNAL_MAPPABLE_BUFFER_SHARED_MEMORY_H_
#define GPU_COMMAND_BUFFER_CLIENT_INTERNAL_MAPPABLE_BUFFER_SHARED_MEMORY_H_
#include <stddef.h>
#include <memory>
#include "components/viz/common/resources/shared_image_format.h"
#include "gpu/command_buffer/client/gpu_command_buffer_client_export.h"
#include "gpu/command_buffer/client/internal/mappable_buffer.h"
namespace gpu {
class ClientSharedImage;
// Implementation of MappableBuffer based on shared memory.
class GPU_COMMAND_BUFFER_CLIENT_EXPORT MappableBufferSharedMemory
: public MappableBuffer {
public:
MappableBufferSharedMemory(const MappableBufferSharedMemory&) = delete;
MappableBufferSharedMemory& operator=(const MappableBufferSharedMemory&) =
delete;
~MappableBufferSharedMemory() override;
static constexpr gfx::GpuMemoryBufferType kBufferType =
gfx::SHARED_MEMORY_BUFFER;
static std::unique_ptr<MappableBufferSharedMemory> CreateFromHandleForTesting(
gfx::GpuMemoryBufferHandle handle,
const gfx::Size& size,
viz::SharedImageFormat format,
gfx::BufferUsage usage) {
return CreateFromHandle(std::move(handle), size, format);
}
static base::OnceClosure AllocateForTesting(
const gfx::Size& size,
viz::SharedImageFormat format,
gfx::BufferUsage usage,
gfx::GpuMemoryBufferHandle* handle);
// Overridden from MappableBuffer:
bool Map() override;
void MapAsync(base::OnceCallback<void(bool)> callback) override;
bool AsyncMappingIsNonBlocking() const override;
void* memory(size_t plane) override;
void Unmap() override;
int stride(size_t plane) const override;
gfx::GpuMemoryBufferType GetType() const override;
gfx::GpuMemoryBufferHandle CloneHandle() const override;
#if BUILDFLAG(IS_WIN)
void SetUsePreMappedMemory(bool use_premapped_memory) override {}
#endif
private:
friend class ClientSharedImage;
static std::unique_ptr<MappableBufferSharedMemory> CreateFromHandle(
gfx::GpuMemoryBufferHandle handle,
const gfx::Size& size,
viz::SharedImageFormat format);
static std::unique_ptr<MappableBufferSharedMemory> CreateFromMapping(
base::WritableSharedMemoryMapping shared_memory_mapping,
const gfx::Size& size,
viz::SharedImageFormat format);
MappableBufferSharedMemory(
const gfx::Size& size,
viz::SharedImageFormat format,
base::UnsafeSharedMemoryRegion shared_memory_region,
base::WritableSharedMemoryMapping shared_memory_mapping,
size_t offset,
uint32_t stride);
void AssertMapped();
const gfx::Size size_;
const viz::SharedImageFormat format_;
base::UnsafeSharedMemoryRegion shared_memory_region_;
base::WritableSharedMemoryMapping shared_memory_mapping_;
size_t offset_;
uint32_t stride_;
// Note: This lock must be held throughout the entirety of the Map() and
// Unmap() operations to avoid corrupt mutation across multiple threads.
base::Lock map_lock_;
uint32_t map_count_ GUARDED_BY(map_lock_) = 0u;
};
} // namespace gpu
#endif // GPU_COMMAND_BUFFER_CLIENT_INTERNAL_MAPPABLE_BUFFER_SHARED_MEMORY_H_
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