renderBuffer.h

//
// Copyright 2018 Pixar
//
// Licensed under the terms set forth in the LICENSE.txt file available at
// https://openusd.org/license.
//
#ifndef PXR_IMAGING_PLUGIN_HD_EMBREE_RENDER_BUFFER_H
#define PXR_IMAGING_PLUGIN_HD_EMBREE_RENDER_BUFFER_H
 
#include "pxr/pxr.h"
#include "pxr/imaging/hd/renderBuffer.h"
 
PXR_NAMESPACE_OPEN_SCOPE
 
class HdEmbreeRenderBuffer : public HdRenderBuffer
{
public:
    HdEmbreeRenderBuffer(SdfPath const& id);
    ~HdEmbreeRenderBuffer() override;
 
    void Sync(HdSceneDelegate *sceneDelegate,
              HdRenderParam *renderParam,
              HdDirtyBits *dirtyBits) override;
 
    void Finalize(HdRenderParam *renderParam) override;
 
    bool Allocate(GfVec3i const& dimensions,
                  HdFormat format,
                  bool multiSampled) override;
 
    unsigned int GetWidth() const override { return _width; }
 
    unsigned int GetHeight() const override { return _height; }
 
    unsigned int GetDepth() const override { return 1; }
 
    HdFormat GetFormat() const override { return _format; }
 
    bool IsMultiSampled() const override { return _multiSampled; }
 
    void* Map() override {
        _mappers++;
        return _buffer.data();
    }
 
    void Unmap() override {
        _mappers--;
    }
 
    bool IsMapped() const override {
        return _mappers.load() != 0;
    }
 
    bool IsConverged() const override {
        return _converged.load();
    }
 
    void SetConverged(bool cv) {
        _converged.store(cv);
    }
 
    void Resolve() override;
 
    // ---------------------------------------------------------------------- //
    // ---------------------------------------------------------------------- //
 
    void Write(GfVec3i const& pixel, size_t numComponents, float const* value);
 
    void Write(GfVec3i const& pixel, size_t numComponents, int const* value);
 
    void Clear(size_t numComponents, float const* value);
 
    void Clear(size_t numComponents, int const* value);
 
private:
    // Calculate the needed buffer size, given the allocation parameters.
    static size_t _GetBufferSize(GfVec2i const& dims, HdFormat format);
 
    // Return the sample format for the given buffer format. Sample buffers
    // are always float32 or int32, but with the same number of components
    // as the base format.
    static HdFormat _GetSampleFormat(HdFormat format);
 
    // Release any allocated resources.
    void _Deallocate() override;
 
    // Buffer width.
    unsigned int _width;
    // Buffer height.
    unsigned int _height;
    // Buffer format.
    HdFormat _format;
    // Whether the buffer is operating in multisample mode.
    bool _multiSampled;
 
    // The resolved output buffer.
    std::vector<uint8_t> _buffer;
    // For multisampled buffers: the input write buffer.
    std::vector<uint8_t> _sampleBuffer;
    // For multisampled buffers: the sample count buffer.
    std::vector<uint32_t> _sampleCount;
 
    // The number of callers mapping this buffer.
    std::atomic<int> _mappers;
    // Whether the buffer has been marked as converged.
    std::atomic<bool> _converged;
};
 
PXR_NAMESPACE_CLOSE_SCOPE
 
#endif // PXR_IMAGING_PLUGIN_HD_EMBREE_RENDER_BUFFER_H