imageShaderRenderPass.h

//
// Copyright 2019 Pixar
//
// Licensed under the terms set forth in the LICENSE.txt file available at
// https://openusd.org/license.
//
#ifndef PXR_IMAGING_HD_ST_IMAGE_SHADER_RENDER_PASS_H
#define PXR_IMAGING_HD_ST_IMAGE_SHADER_RENDER_PASS_H
 
#include "pxr/pxr.h"
#include "pxr/imaging/hdSt/api.h"
#include "pxr/imaging/hdSt/drawItemInstance.h"
#include "pxr/imaging/hd/renderPass.h"
 
#include <memory>
 
PXR_NAMESPACE_OPEN_SCOPE
 
using HdStResourceRegistrySharedPtr = 
    std::shared_ptr<class HdStResourceRegistry>;
 
using HdSt_ImageShaderRenderPassSharedPtr =
    std::shared_ptr<class HdSt_ImageShaderRenderPass>;
using HdStResourceRegistrySharedPtr = 
    std::shared_ptr<class HdStResourceRegistry>;
 
class Hgi;
 
class HdSt_ImageShaderRenderPass final : public HdRenderPass {
public:
    HDST_API
    HdSt_ImageShaderRenderPass(HdRenderIndex *index, 
                               HdRprimCollection const &collection);
 
    HDST_API
    virtual ~HdSt_ImageShaderRenderPass();
 
    // Set the vertex BAR and geometric shader for the triangle.
    // This function should be called before the Execute task phase.
    HDST_API
    void SetupFullscreenTriangleDrawItem();
protected:
 
    void _Execute(HdRenderPassStateSharedPtr const &renderPassState,
                  TfTokenVector const &renderTags) override;
 
private:
    // Setup a BAR for a single triangle
    void _SetupVertexPrimvarBAR(HdStResourceRegistrySharedPtr const&);
 
    // We re-use the immediateBatch to draw the full-screen triangle.
    HdRprimSharedData _sharedData;
    HdStDrawItem _drawItem;
    HdStDrawItemInstance _drawItemInstance;
    HdSt_DrawBatchSharedPtr _drawBatch;
    Hgi* _hgi;
};
 
PXR_NAMESPACE_CLOSE_SCOPE
 
#endif