DtShaderEffectRain.h

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/******************************************************************************
** Copyright (c) 2021 MAK Technologies, Inc.
** All rights reserved.
******************************************************************************/


#pragma once

#include <vrvOsg/vrvOsg.h>

#include <vrvOsg/DtShaderEffect.h>

#include <vrvCore/DtVirtualBaseClassCreator.h>

#include <vrvUtil/DtSignalConnectionManager.h>
#include <vrvUtil/DtRandomNumberGenerator.h>

#include <osg/ref_ptr>
#include <osg/Texture2D>
#include <osg/Uniform>
#include <osg/Object>
#include <osg/StateSet>
#include <osg/OperationThread>
#include <osg/Vec4>
#include <osg/State>

#include <string>
#include <vector>

namespace makVrv
{
   class DtOsgWeatherEffectsObject;
   class DtIndirectTextureProcessor;
   class DtGlProgram;
   class DtShaderEffectRain;

   typedef DtVirtualBaseClassCreator<DtShaderEffectRain> DtShaderEffectRainCreator;

   template <>
   inline const char* creatorTypeName<DtShaderEffectRain>(void) { return "DtShaderEffectRainCreator"; }

   class DT_DLL_VRVOSG DtShaderEffectRain : public DtShaderEffect
   {
   public:

      // Inner class for generating a texture for rain hitting the puddles
      class RainEffectGeneration : public osg::Operation
      {
      public:
         RainEffectGeneration(DtShaderEffectRain& effectManager, DtDe& de);
         
         virtual ~RainEffectGeneration();

         RainEffectGeneration() = delete;
         RainEffectGeneration(const RainEffectGeneration&) = delete;
         RainEffectGeneration &operator=(const RainEffectGeneration&) = delete;

      protected:

         virtual void operator () (osg::Object* sv);

         virtual void release();

         virtual DtGlProgram* genComputeProg();

      protected:
         DtRandomNumberGenerator myRandomNumberGen;

         DtShaderEffectRain& myShaderEffectManager;
         DtDe& myDe;

         DtGlProgram* myComputeProgram;

         bool myClearedDrops;
         int myOutputTextureUniformLoc;
         int mySimTimeUniformLoc;
         int myRainDropsTexUniformLoc;
         int myCurrentRainDrop;
         double myLastSimTime;
         
         std::vector<float> myRainDrops;
      };

   public:

      DtShaderEffectRain(DtDe& de);

      virtual ~DtShaderEffectRain();

      DtShaderEffectRain() = delete;
      DtShaderEffectRain(const DtShaderEffectRain&) = delete;
      DtShaderEffectRain &operator=(const DtShaderEffectRain&) = delete;

   public:
      virtual void initializeEffect(const std::vector<osg::StateSet*>& stateSets,
         DtIndirectTextureProcessor* textureProcessor, DtOsgRenderer& osgRenderer);

      virtual void registerWeatherEffectsObject(DtOsgWeatherEffectsObject* weatherEffectsObject);

      virtual void releaseGLObjects(osg::State* state) override;

      virtual void updateImGui();

      virtual void updateUniforms();

      virtual void setCameraLocation(const DtVector& location);

      // \brief gets the location for localized effects.
      virtual const DtVector& cameraLocation() const;

   protected:

      virtual RainEffectGeneration* createRainEffectJob();
      
      virtual void slot_rainAccumulationChanged(double depth);

      virtual void updateEnabledState(const float depth);

   public:

      static const std::string& theClassName();

   protected:

      DtSignalConnectionManager myConnections;

      osg::ref_ptr<osg::Uniform> myEnableRainUniform;
      osg::ref_ptr<osg::Uniform> myRainUpThresholdUniform;
      osg::ref_ptr<osg::Uniform> myRainColorUniform;
      osg::ref_ptr<osg::Uniform> myRainMaskedRoadUniform;
      
      GLuint myRainEffectTextureId;
      osg::ref_ptr<osg::Texture2D> myRainEffectTexture;
         
      DtOsgRenderer& myOsgRenderer;

      bool myRainEnabled;
      float myRainUpThresholdRange;
      float myRainUpThresholdMin;

      float myRainMaskedRoadMax;
      float myRainMaskedRoadRange;
      float myRainAccumulationDepth;
      
      bool myEnablePuddleEffects;

      osg::Vec4 myRainColor;

      DtOsgWeatherEffectsObject* myWeatherEffectsObject;

      RainEffectGeneration* myRainEffectGenerationJob;

      DtVector myCameraLocation;

      float myPrecipitationIntensity;
   };
}