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// Copyright 2021 The Dawn Authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#ifndef DAWN_NODE_BINDING_GPUBUFFER_H_
#define DAWN_NODE_BINDING_GPUBUFFER_H_
#include "dawn/webgpu_cpp.h"
#include "dawn_native/DawnNative.h"
#include "napi.h"
#include "src/dawn_node/binding/AsyncRunner.h"
#include "src/dawn_node/interop/WebGPU.h"
namespace wgpu { namespace binding {
// GPUBuffer is an implementation of interop::GPUBuffer that wraps a wgpu::Buffer.
class GPUBuffer final : public interop::GPUBuffer {
public:
GPUBuffer(wgpu::Buffer buffer,
wgpu::BufferDescriptor desc,
wgpu::Device device,
std::shared_ptr<AsyncRunner> async);
// Desc() returns the wgpu::BufferDescriptor used to construct the buffer
const wgpu::BufferDescriptor& Desc() const {
return desc_;
}
// Implicit cast operator to Dawn GPU object
inline operator const wgpu::Buffer &() const {
return buffer_;
}
// interop::GPUBuffer interface compliance
interop::Promise<void> mapAsync(Napi::Env env,
interop::GPUMapModeFlags mode,
interop::GPUSize64 offset,
std::optional<interop::GPUSize64> size) override;
interop::ArrayBuffer getMappedRange(Napi::Env env,
interop::GPUSize64 offset,
std::optional<interop::GPUSize64> size) override;
void unmap(Napi::Env) override;
void destroy(Napi::Env) override;
std::optional<std::string> getLabel(Napi::Env) override;
void setLabel(Napi::Env, std::optional<std::string> value) override;
private:
struct Mapping {
uint64_t start;
uint64_t end;
inline bool Intersects(uint64_t s, uint64_t e) const {
return s < end && e > start;
}
Napi::Reference<interop::ArrayBuffer> buffer;
};
// https://www.w3.org/TR/webgpu/#buffer-interface
enum class State {
Unmapped,
Mapped,
MappedAtCreation,
MappingPending,
Destroyed,
};
wgpu::Buffer buffer_;
wgpu::BufferDescriptor const desc_;
wgpu::Device const device_;
std::shared_ptr<AsyncRunner> async_;
State state_ = State::Unmapped;
std::vector<Mapping> mapped_;
};
}} // namespace wgpu::binding
#endif // DAWN_NODE_BINDING_GPUBUFFER_H_