oitRenderTask.h

//
// Copyright 2019 Pixar
//
// Licensed under the terms set forth in the LICENSE.txt file available at
// https://openusd.org/license.
//
#ifndef PXR_IMAGING_HDX_OIT_RENDER_TASK_H
#define PXR_IMAGING_HDX_OIT_RENDER_TASK_H
 
#include "pxr/pxr.h"
#include "pxr/imaging/hdx/api.h"
#include "pxr/imaging/hdx/version.h"
#include "pxr/imaging/hdx/renderTask.h"
 
#include <memory>
 
PXR_NAMESPACE_OPEN_SCOPE
 
using HdStRenderPassShaderSharedPtr = std::shared_ptr<HdStRenderPassShader>;
 
class HdxOitRenderTask : public HdxRenderTask
{
public:
    HDX_API
    HdxOitRenderTask(HdSceneDelegate* delegate, SdfPath const& id);
 
    HDX_API
    ~HdxOitRenderTask() override;
 
    HDX_API
    bool IsConverged() const override;
 
    HDX_API
    void Prepare(HdTaskContext* ctx,
                 HdRenderIndex* renderIndex) override;
 
    HDX_API
    void Execute(HdTaskContext* ctx) override;
 
protected:
    HDX_API
    void _Sync(HdSceneDelegate* delegate,
               HdTaskContext* ctx,
               HdDirtyBits* dirtyBits) override;
 
    HdRenderPassStateSharedPtr _GetTranslucentPassState() const {
        return _translucentPassState;
    }
 
private:
    HdxOitRenderTask() = delete;
    HdxOitRenderTask(const HdxOitRenderTask &) = delete;
    HdxOitRenderTask &operator =(const HdxOitRenderTask &) = delete;
 
    HdStRenderPassShaderSharedPtr _translucentPassShader;
    HdStRenderPassShaderSharedPtr _opaquePassShader;
    HdRenderPassStateSharedPtr _translucentPassState;
    HdRenderPassSharedPtr _translucentPass;
    // Set at initialization time.
    const bool _isOitEnabled;
    // Prepare() does a bunch of analysis to figure out whether the OIT
    // task should run this frame.
    bool _oitShouldDraw;
};
 
 
PXR_NAMESPACE_CLOSE_SCOPE
 
#endif //PXR_IMAGING_HDX_OIT_RENDER_TASK_H