// Copyright 2017 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 SRC_DAWN_NATIVE_METAL_BUFFERMTL_H_
#define SRC_DAWN_NATIVE_METAL_BUFFERMTL_H_

#include "dawn/common/NSRef.h"
#include "dawn/common/SerialQueue.h"
#include "dawn/native/Buffer.h"

#import <Metal/Metal.h>

namespace dawn::native::metal {

class CommandRecordingContext;
class Device;

class Buffer final : public BufferBase {
  public:
    static ResultOrError<Ref<Buffer>> Create(Device* device, const BufferDescriptor* descriptor);

    Buffer(DeviceBase* device, const BufferDescriptor* descriptor);

    id<MTLBuffer> GetMTLBuffer() const;

    bool EnsureDataInitialized(CommandRecordingContext* commandContext);
    bool EnsureDataInitializedAsDestination(CommandRecordingContext* commandContext,
                                            uint64_t offset,
                                            uint64_t size);
    bool EnsureDataInitializedAsDestination(CommandRecordingContext* commandContext,
                                            const CopyTextureToBufferCmd* copy);

    static uint64_t QueryMaxBufferLength(id<MTLDevice> mtlDevice);

  private:
    using BufferBase::BufferBase;
    MaybeError Initialize(bool mappedAtCreation);

    ~Buffer() override;

    MaybeError MapAsyncImpl(wgpu::MapMode mode, size_t offset, size_t size) override;
    void UnmapImpl() override;
    void DestroyImpl() override;
    void* GetMappedPointerImpl() override;
    bool IsCPUWritableAtCreation() const override;
    MaybeError MapAtCreationImpl() override;

    void InitializeToZero(CommandRecordingContext* commandContext);
    void ClearBuffer(CommandRecordingContext* commandContext,
                     uint8_t clearValue,
                     uint64_t offset = 0,
                     uint64_t size = 0);

    NSPRef<id<MTLBuffer>> mMtlBuffer;
};

}  // namespace dawn::native::metal

#endif  // SRC_DAWN_NATIVE_METAL_BUFFERMTL_H_