DtVariableRateShadingImageUpdater.h

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


#pragma once

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

namespace makVrv
{
   class DtVariableRateShadingImage;
   class DtGlProgram;


   class DT_DLL_VRVOSG DtVariableRateShadingImageUpdater : public osg::Drawable
   {
   private:
      DtVariableRateShadingImageUpdater() = delete;

      DtVariableRateShadingImageUpdater(const DtVariableRateShadingImageUpdater& other) = delete;

      DtVariableRateShadingImageUpdater& operator=(const DtVariableRateShadingImageUpdater &other) = delete;

   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;
   };
}