DtVariableRateShadingImagePalette.h

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


#pragma once

#include <vrvOsg/DtVariableRateShadingImage.h>

namespace makVrv
{

   class DT_DLL_VRVOSG DtVariableRateShadingImagePalette : public osg::Referenced
   {
   private:
       DtVariableRateShadingImagePalette(const DtVariableRateShadingImagePalette& other);

       DtVariableRateShadingImagePalette& operator=(const DtVariableRateShadingImagePalette &other);

   public:
      DtVariableRateShadingImagePalette(DtDe& de);

      void initGLObjects(osg::State& state);

      std::vector<GLenum>& paletteData();

      void populatePaletteData(const std::vector<GLuint>& data, GLuint defaultValue);

      void bindShadingRatePalette(osg::State& state);

      bool isInitalised();

   protected:
      virtual ~DtVariableRateShadingImagePalette();

   protected:
      DtDe& myDe;

      VariableRateShadingExtensions* myExt;

      GLint myShadingRateImagePaletteSize;
      std::vector<GLenum> myShadingRatePaletteData;
   };

   class DT_DLL_VRVOSG DtVariableRateShadingImagePaletteStateAttribute : public osg::StateAttribute
   {
   public:

       static const osg::StateAttribute::Type DtVariableRateShadingImagePaletteStateAttributeType = (osg::StateAttribute::Type)3001;

       DtVariableRateShadingImagePaletteStateAttribute(DtVariableRateShadingImagePalette* palette = NULL);

       ~DtVariableRateShadingImagePaletteStateAttribute();

       DtVariableRateShadingImagePaletteStateAttribute(const DtVariableRateShadingImagePaletteStateAttribute& stateAttrib, const osg::CopyOp& copyop = osg::CopyOp::SHALLOW_COPY);

       META_StateAttribute(osg, DtVariableRateShadingImagePaletteStateAttribute, DtVariableRateShadingImagePaletteStateAttributeType);

       virtual bool isTextureAttribute() const;

       virtual int compare(const osg::StateAttribute& sa) const;

       virtual void apply(osg::State&) const;

       virtual void compileGLObjects(osg::State&) const;

       virtual void releaseGLObjects(osg::State* = 0) const;
       
       DtVariableRateShadingImagePalette* palette() const;

   private:

       osg::ref_ptr<DtVariableRateShadingImagePalette> myShadingRateImagePalette;
   };
}