DtRainEffectGeneration.h

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


#pragma once

#include <vrvOsg/vrvOsg.h>

#include <vrvOsg/DtGpuOperation.h>

#include <vrvUtil/DtRandomNumberGenerator.h>

#include <vector>

namespace makVrv
{
   class DtDe;
   class DtShaderEffectRain;
   class DtGlProgram;
   
   // Inner class for generating a texture for rain hitting the puddles
   class DtRainEffectGeneration : public DtGpuOperation
   {
   public:
      DtRainEffectGeneration(DtShaderEffectRain& parent, DtDe& de);

      virtual ~DtRainEffectGeneration();

      DtRainEffectGeneration() = delete;
      DtRainEffectGeneration(const DtRainEffectGeneration&) = delete;
      DtRainEffectGeneration& operator=(const DtRainEffectGeneration&) = delete;
   public:
      virtual void execute();
   protected:
      virtual DtGlProgram* genComputeProg();

   protected:
      DtRandomNumberGenerator myRandomNumberGen;

      DtShaderEffectRain& myShaderEffectRain;

      DtGlProgram* myComputeProgram;

      bool myClearedDrops;
      int myOutputTextureUniformLoc;
      int mySimTimeUniformLoc;
      int myRainDropsTexUniformLoc;
      int myCurrentRainDrop;
      double myLastSimTime;

      std::vector<float> myRainDrops;
   };

}