extCompGpuComputationResource.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_RESOURCE_H
#define PXR_IMAGING_HD_ST_EXT_COMP_GPU_COMPUTATION_RESOURCE_H
 
#include "pxr/pxr.h"
#include "pxr/imaging/hdSt/api.h"
#include "pxr/imaging/hd/bufferSource.h"
#include "pxr/imaging/hdSt/resourceBinder.h"
#include "pxr/imaging/hdSt/extCompComputeShader.h"
#include "pxr/imaging/hdSt/resourceRegistry.h"
 
#include <vector>
 
PXR_NAMESPACE_OPEN_SCOPE
 
using HdStExtCompGpuComputationResourceSharedPtr =
    std::shared_ptr<class HdStExtCompGpuComputationResource>;
using HdStGLSLProgramSharedPtr= std::shared_ptr<class HdStGLSLProgram>;
using HdBufferArrayRangeSharedPtrVector =
    std::vector<HdBufferArrayRangeSharedPtr>;
 
class HdStExtCompGpuComputationResource final {
public:
    HdStExtCompGpuComputationResource(
        HdBufferSpecVector const &outputBufferSpecs,
        HdSt_ExtCompComputeShaderSharedPtr const &kernel,
        HdBufferArrayRangeSharedPtrVector const &inputs,
        HdStResourceRegistrySharedPtr const &registry
    );
 
    virtual ~HdStExtCompGpuComputationResource() = default;
 
    HdBufferArrayRangeSharedPtrVector const &GetInputs() const {
        return _inputs;
    }
 
    HdStGLSLProgramSharedPtr const &GetProgram() {
        if (!_computeProgram) {
            _Resolve();
        }
        return _computeProgram;
    }
 
    HdSt_ResourceBinder const &GetResourceBinder() {
        if (!_computeProgram) {
            _Resolve();
        }
        return _resourceBinder;
    }
 
private:
    bool _Resolve();
 
    HdBufferSpecVector                    _outputBufferSpecs;
    HdSt_ExtCompComputeShaderSharedPtr    _kernel;
    HdStResourceRegistrySharedPtr         _registry;
    
    size_t                                _shaderSourceHash;
    HdBufferArrayRangeSharedPtrVector     _inputs;  
    HdStGLSLProgramSharedPtr              _computeProgram;
    HdSt_ResourceBinder                   _resourceBinder;
    
    HdStExtCompGpuComputationResource()                = delete;
    HdStExtCompGpuComputationResource(
            const HdStExtCompGpuComputationResource &) = delete;
    HdStExtCompGpuComputationResource &operator = (
            const HdStExtCompGpuComputationResource &) = delete;
};
 
PXR_NAMESPACE_CLOSE_SCOPE
 
#endif // PXR_IMAGING_HD_ST_EXT_COMP_GPU_COMPUTATION_RESOURCE_H