DtProgramUniformLocationMap.h

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/******************************************************************************
** Copyright (c) 2023 MAK Technologies, Inc.
** All rights reserved.
******************************************************************************/


#pragma once

#include <vrvOsg/vrvOsg.h>

#include <unordered_map>

namespace osg
{
   class StateSet;
   class Uniform;
}

namespace makVrv
{
   class DtDe;

   class DT_DLL_VRVOSG DtProgramUniformLocationMap
   {
   public:
      DtProgramUniformLocationMap(DtDe& de);
      virtual ~DtProgramUniformLocationMap();

      DtProgramUniformLocationMap() = delete;
      DtProgramUniformLocationMap(const DtProgramUniformLocationMap& rhs) = delete;
      DtProgramUniformLocationMap& operator=(const DtProgramUniformLocationMap& rhs) = delete;
   public:
      virtual void applyUniforms(const osg::StateSet* ss, int program);

      virtual void clear(void);
   protected:
      virtual void apply(unsigned int program, const osg::Uniform* uniform, unsigned int location) const;
   protected:
      DtDe& myDe;

      struct UniformInfo
      {
         int location = -1;
         int triedToGetLocation = false;
         const void* uniform = nullptr;
      };
      typedef std::unordered_map<unsigned int, UniformInfo > MapUniformIdToUniformInfo;
      typedef std::unordered_map<int, MapUniformIdToUniformInfo> MapProgramToMapUniformIdToUniformInfo;

      MapProgramToMapUniformIdToUniformInfo myMap;
   };
}