src/dawn/native/DynamicUploader.h

// Copyright 2018 The Dawn & Tint Authors
//
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// modification, are permitted provided that the following conditions are met:
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// 2. Redistributions in binary form must reproduce the above copyright notice,
//    this list of conditions and the following disclaimer in the documentation
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#ifndef SRC_DAWN_NATIVE_DYNAMICUPLOADER_H_
#define SRC_DAWN_NATIVE_DYNAMICUPLOADER_H_

#include <memory>
#include <vector>

#include "dawn/common/Ref.h"
#include "dawn/native/Error.h"
#include "dawn/native/Forward.h"
#include "dawn/native/IntegerTypes.h"
#include "dawn/native/RingBufferAllocator.h"
#include "partition_alloc/pointers/raw_ptr.h"

// DynamicUploader is the front-end implementation used to manage multiple ring buffers for upload
// usage.
namespace dawn::native {

class BufferBase;

struct UploadReservation {
    void* mappedPointer = nullptr;
    uint64_t offsetInBuffer = 0;
    Ref<BufferBase> buffer;
};

class DynamicUploader {
  public:
    explicit DynamicUploader(DeviceBase* device);
    ~DynamicUploader() = default;

    // Transiently makes a reservation for an upload area for the functor passed in argument.
    template <typename F>
    MaybeError WithUploadReservation(uint64_t size, uint64_t offsetAlignment, F&& f) {
        UploadReservation reservation;
        DAWN_TRY_ASSIGN(reservation, Reserve(size, offsetAlignment));
        return f(reservation);
    }

    void Deallocate(ExecutionSerial lastCompletedSerial, bool freeAll = false);

    bool ShouldFlush() const;

  private:
    static constexpr uint64_t kRingBufferSize = 4 * 1024 * 1024;
    uint64_t GetTotalAllocatedSize() const;

    struct RingBuffer {
        Ref<BufferBase> mStagingBuffer;
        RingBufferAllocator mAllocator;
    };

    ResultOrError<UploadReservation> Reserve(uint64_t size, uint64_t offsetAlignment);

    std::vector<std::unique_ptr<RingBuffer>> mRingBuffers;
    raw_ptr<DeviceBase> mDevice;
};
}  // namespace dawn::native

#endif  // SRC_DAWN_NATIVE_DYNAMICUPLOADER_H_