DtOsgTextureBufferObjectApplyAttribute.h

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


#pragma once

#include <vrvOsg/vrvOsg.h>

#include <map>

#include <osg/StateAttribute>

namespace osg
{
   class State;
}

namespace makVrv
{
   class DtGlTextureBufferObject;

   class DT_DLL_VRVOSG TextureBufferObjectApplyAttribute : public osg::StateAttribute
   {
   public:
      TextureBufferObjectApplyAttribute();

      void addTextureBufferObject(size_t index, DtGlTextureBufferObject* texture);
      DtGlTextureBufferObject* getTextureBufferObject(size_t index);
      void removeTextureBufferObject(size_t index, DtGlTextureBufferObject* texture);

      TextureBufferObjectApplyAttribute(const TextureBufferObjectApplyAttribute& copy, const osg::CopyOp& copyOp =
         osg::CopyOp::SHALLOW_COPY);

      virtual ~TextureBufferObjectApplyAttribute();

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

      virtual int compare(const StateAttribute& sa) const;
      
      virtual void releaseGLObjects(osg::State* state/* =0 */) const;

      META_StateAttribute(osg, TextureBufferObjectApplyAttribute,  osg::StateAttribute::Type(TRANSFORMFEEDBACKBUFFERBINDING+2))
   private:
       TextureBufferObjectApplyAttribute& operator=(const TextureBufferObjectApplyAttribute&);

      typedef std::map<size_t, DtGlTextureBufferObject*> MapTexUnitToTextureBufferObjects;
      MapTexUnitToTextureBufferObjects myMapTexUnitToTextures;
   };
}