extCompGpuComputation.h

//
// Copyright 2017 Pixar
//
// Licensed under the terms set forth in the LICENSE.txt file available at
// https://openusd.org/license.
//
#ifndef PXR_IMAGING_HD_ST_EXT_COMP_GPU_COMPUTATION_H
#define PXR_IMAGING_HD_ST_EXT_COMP_GPU_COMPUTATION_H
 
#include "pxr/pxr.h"
#include "pxr/imaging/hdSt/api.h"
#include "pxr/imaging/hdSt/computation.h"
#include "pxr/imaging/hdSt/extCompGpuComputationResource.h"
 
#include "pxr/imaging/hd/bufferSource.h"
 
#include "pxr/usd/sdf/path.h"
#include "pxr/base/tf/token.h"
#include "pxr/base/vt/value.h"
 
#include <memory>
#include <vector>
 
PXR_NAMESPACE_OPEN_SCOPE
 
 
class HdSceneDelegate;
class HdExtComputation;
using HdStGLSLProgramSharedPtr= std::shared_ptr<class HdStGLSLProgram>;
using HdExtComputationPrimvarDescriptorVector =
    std::vector<struct HdExtComputationPrimvarDescriptor>;
 
using HdStExtCompGpuComputationSharedPtr = 
    std::shared_ptr<class HdStExtCompGpuComputation>;
 
 
class HdStExtCompGpuComputation final : public HdStComputation
{
public:
    HdStExtCompGpuComputation(
            SdfPath const &id,
            HdStExtCompGpuComputationResourceSharedPtr const &resource,
            HdExtComputationPrimvarDescriptorVector const &compPrimvars,
            int dispatchCount,
            int elementCount);
 
    HDST_API
    static HdStExtCompGpuComputationSharedPtr
    CreateGpuComputation(
        HdSceneDelegate *sceneDelegate,
        HdExtComputation const *sourceComp,
        HdExtComputationPrimvarDescriptorVector const &compPrimvars);
 
    HDST_API
    ~HdStExtCompGpuComputation() override;
 
    HDST_API
    void GetBufferSpecs(HdBufferSpecVector *specs) const override;
 
    HDST_API
    void Execute(HdBufferArrayRangeSharedPtr const &range,
                 HdResourceRegistry *resourceRegistry) override;
 
    HDST_API
    int GetDispatchCount() const;
 
    HDST_API
    int GetNumOutputElements() const override;
    
    HDST_API
    HdStExtCompGpuComputationResourceSharedPtr const &GetResource() const;
 
private:
    SdfPath                                      _id;
    HdStExtCompGpuComputationResourceSharedPtr   _resource;
    HdExtComputationPrimvarDescriptorVector      _compPrimvars;
    int                                          _dispatchCount;
    int                                          _elementCount;
 
    HdStExtCompGpuComputation() = delete;
    HdStExtCompGpuComputation(
        const HdStExtCompGpuComputation &) = delete;
    HdStExtCompGpuComputation &operator = (
        const HdStExtCompGpuComputation &) = delete;
};
 
 
HDST_API
void HdSt_GetExtComputationPrimvarsComputations(
    const SdfPath &id,
    HdSceneDelegate *sceneDelegate,
    HdExtComputationPrimvarDescriptorVector const& allCompPrimvars,
    HdDirtyBits dirtyBits,
    HdBufferSourceSharedPtrVector *sources,
    HdBufferSourceSharedPtrVector *reserveOnlySources,
    HdBufferSourceSharedPtrVector *separateComputationSources,
    HdStComputationComputeQueuePairVector *computations);
 
 
PXR_NAMESPACE_CLOSE_SCOPE
 
#endif // PXR_IMAGING_HD_ST_EXT_COMP_GPU_COMPUTATION_H