stagingBuffer.h

//
// Copyright 2021 Pixar
//
// Licensed under the terms set forth in the LICENSE.txt file available at
// https://openusd.org/license.
//
#ifndef PXR_IMAGING_HD_ST_STAGING_BUFFER_H
#define PXR_IMAGING_HD_ST_STAGING_BUFFER_H
 
#include "pxr/pxr.h"
#include "pxr/imaging/hdSt/api.h"
 
#include "pxr/imaging/hgi/blitCmdsOps.h"
#include "pxr/imaging/hgi/buffer.h"
 
#include <memory>
#include <vector>
 
PXR_NAMESPACE_OPEN_SCOPE
 
class HdStResourceRegistry;
 
using HdStStagingBufferSharedPtr =
    std::shared_ptr<class HdStStagingBuffer>;
 
class HdStStagingBuffer
{
public:
    HDST_API
    HdStStagingBuffer(HdStResourceRegistry *resourceRegistry);
 
    HDST_API
    ~HdStStagingBuffer();
 
    HDST_API
    void Deallocate();
 
    HDST_API
    void Resize(size_t totalSize);
 
    HDST_API
    void StageCopy(HgiBufferCpuToGpuOp const &copyOp);
 
    HDST_API
    void Flush();
 
private:
    static constexpr int32_t MULTIBUFFERING = 3;
 
    HdStResourceRegistry *_resourceRegistry;
    HgiBufferHandle _handles[MULTIBUFFERING];
    std::vector<HgiBufferGpuToGpuOp> _gpuCopyOps;
    size_t _head;
    size_t _capacity;
    size_t _activeSlot;
    bool _isUma;
};
 
PXR_NAMESPACE_CLOSE_SCOPE
 
#endif // PXR_IMAGING_HD_ST_STAGING_BUFFER_H