DtVariableRateShadingImageUpdater.h

Go to the documentation of this file.

/******************************************************************************
** Copyright (c) 2020 MAK Technologies, Inc.
** All rights reserved.
******************************************************************************/


#pragma once

#include <vrvOsg/DtOsgChannel.h>
#include <vrvGraphicsUtils/DtGlRenderToTexture.h>


namespace makVrv
{
    class DtVariableRateShadingImage;


   class DT_DLL_VRVOSG DtVariableRateShadingImageUpdater : public osg::Drawable
   {
   private:
       DtVariableRateShadingImageUpdater(const DtVariableRateShadingImageUpdater& other);

       DtVariableRateShadingImageUpdater& operator=(const DtVariableRateShadingImageUpdater &other);

   public:
       DtVariableRateShadingImageUpdater(DtDe& de, DtVariableRateShadingImage* vrsImage);

       virtual void drawImplementation(osg::RenderInfo& info) const;

       virtual void releaseGLObjects(osg::State* state/* =0 */) const;

       virtual void shouldUpdate(bool shouldUpdate);

       virtual void restoreLastFboTarget(GLenum fboTarget);

   protected:
       virtual ~DtVariableRateShadingImageUpdater();

       virtual void update(osg::State* state) const;

       virtual void initProgram(osg::State* state) const;

   protected:
       DtDe& myDe;

       DtVariableRateShadingImage* myVariableRateShadingImage;

       mutable DtGlProgram* myProgram;

       mutable std::string myVertexShaderSource;

       mutable std::string myFragmentShaderSource;

       mutable osg::ref_ptr<osg::StateSet> myVrsFillStateSet;

       mutable bool myShouldUpdate;

       GLenum myRestoreFboTarget;
   };

   class DT_DLL_VRVOSG  DtVariableRateShadingImageUpdaterDrawCallback : public osg::Camera::DrawCallback
   {
   private:
      DtVariableRateShadingImageUpdaterDrawCallback(const DtVariableRateShadingImageUpdaterDrawCallback& other);

      DtVariableRateShadingImageUpdaterDrawCallback& operator=(const DtVariableRateShadingImageUpdaterDrawCallback &other);

   public:
      DtVariableRateShadingImageUpdaterDrawCallback(DtVariableRateShadingImageUpdater* updater,
                                                    osg::Camera::DrawCallback* nextCallback);

      virtual void operator () (osg::RenderInfo& renderInfo) const;

      osg::Camera::DrawCallback* nextDrawCallback();

   protected:
      virtual ~DtVariableRateShadingImageUpdaterDrawCallback();

   protected:
      osg::ref_ptr< DtVariableRateShadingImageUpdater> myShadingRateImageUpdater;

      osg::ref_ptr<osg::Camera::DrawCallback> myNextCallback;
   };
}