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/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#ifndef GPU_BUFFER_H_
#define GPU_BUFFER_H_
#include "js/RootingAPI.h"
#include "mozilla/dom/Nullable.h"
#include "mozilla/webgpu/WebGPUTypes.h"
#include "nsTArray.h"
#include "ObjectModel.h"
#include "mozilla/ipc/RawShmem.h"
#include <memory>
namespace mozilla {
class ErrorResult;
namespace dom {
struct GPUBufferDescriptor;
template <typename T>
class Optional;
enum class GPUBufferMapState : uint8_t;
} // namespace dom
namespace webgpu {
class Device;
struct MappedInfo {
// True if mapping is requested for writing.
bool mWritable = false;
// Populated by `GetMappedRange`.
nsTArray<JS::Heap<JSObject*>> mArrayBuffers;
BufferAddress mOffset;
BufferAddress mSize;
MappedInfo() = default;
MappedInfo(const MappedInfo&) = delete;
};
class Buffer final : public ObjectBase, public ChildOf<Device> {
public:
NS_DECL_CYCLE_COLLECTION_SCRIPT_HOLDER_NATIVE_CLASS(Buffer)
NS_INLINE_DECL_CYCLE_COLLECTING_NATIVE_REFCOUNTING(Buffer)
GPU_DECL_JS_WRAP(Buffer)
static already_AddRefed<Buffer> Create(Device* aDevice, RawId aDeviceId,
const dom::GPUBufferDescriptor& aDesc,
ErrorResult& aRv);
already_AddRefed<dom::Promise> MapAsync(uint32_t aMode, uint64_t aOffset,
const dom::Optional<uint64_t>& aSize,
ErrorResult& aRv);
void GetMappedRange(JSContext* aCx, uint64_t aOffset,
const dom::Optional<uint64_t>& aSize,
JS::Rooted<JSObject*>* aObject, ErrorResult& aRv);
void Unmap(JSContext* aCx, ErrorResult& aRv);
void Destroy(JSContext* aCx, ErrorResult& aRv);
const RawId mId;
uint64_t Size() const { return mSize; }
uint32_t Usage() const { return mUsage; }
dom::GPUBufferMapState MapState() const;
private:
Buffer(Device* const aParent, RawId aId, BufferAddress aSize, uint32_t aUsage,
ipc::WritableSharedMemoryMapping&& aShmem);
virtual ~Buffer();
Device& GetDevice() { return *mParent; }
void Drop();
void UnmapArrayBuffers(JSContext* aCx, ErrorResult& aRv);
void RejectMapRequest(dom::Promise* aPromise, nsACString& message);
void AbortMapRequest();
void SetMapped(BufferAddress aOffset, BufferAddress aSize, bool aWritable);
// Note: we can't map a buffer with the size that don't fit into `size_t`
// (which may be smaller than `BufferAddress`), but general not all buffers
// are mapped.
const BufferAddress mSize;
const uint32_t mUsage;
nsString mLabel;
// Information about the currently active mapping.
Maybe<MappedInfo> mMapped;
RefPtr<dom::Promise> mMapRequest;
// mShmem does not point to a shared memory segment if the buffer is not
// mappable.
std::shared_ptr<ipc::WritableSharedMemoryMapping> mShmem;
};
} // namespace webgpu
} // namespace mozilla
#endif // GPU_BUFFER_H_
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