DtIndirectCullProgram.h

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/******************************************************************************
** Copyright (c) 2022 VT-MAK Technologies, Inc.
** All rights reserved.
******************************************************************************/


#pragma once

#include <vrvOsg/vrvOsg.h>

#include <vrvOsg/DtCullShaderConfig.h>

#include <vrvMath/DtVector3.h>

#include <vrvUtil/DtVirtualBaseClassCreator.h>

#include <map>

namespace osg
{
   class State;
   class FrameStamp;
   class Camera;
}

namespace makVrv
{
   class DtGpuCulling;
   class DtIndirectViewParameters;
   class DtGlCaps;
   class DtGlBuffer;
   class DtGlProgram;
   class DtIndirectRunTimeSettings;
   class DtIndirectCullProgramConstants;
   class DtIndirectCullProgramBufferAddresses;
   class DtSkyObjectManager;
   class DtCullShaderConfig;

   class DtIndirectCullProgram;

   typedef DtVirtualBaseClassCreator<DtIndirectCullProgram, const DtCullShaderConfig&> DtIndirectCullProgramCreator;

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

   class DT_DLL_VRVOSG DtIndirectCullProgram
   {
   protected:
      DtIndirectCullProgram(DtDe& de, const DtCullShaderConfig& cullShaderConfig);

      //friend class so that it 
      friend DtIndirectCullProgramCreator;

   public:
      //Destructor
      virtual ~DtIndirectCullProgram();

      DtIndirectCullProgram() = delete;
      DtIndirectCullProgram(const DtIndirectCullProgram &other) = delete;
      DtIndirectCullProgram &operator=(const DtIndirectCullProgram &other) = delete;

   public:

      virtual void incrementNumUsers();

      virtual void decrementNumUsers();

      virtual void execute(const DtIndirectViewParameters& viewParameters
         , const DtGpuCulling& gpuCulling
         , const osg::FrameStamp* frameStamp
         , const int lightSourceStateId
         , const int geometrySpecificationsBufferSize
         , const uint64_t geomSpecIndexToCommandIndexAddress
         , const uint64_t gpuPerGeomInstancesAddress
         , const osg::Camera* camera);

      virtual void deleteShaders();

   protected:
      virtual void initializeIfNecessary(void);


   protected:
      DtGlProgram* myCullProgram;

      DtIndirectCullProgramConstants* myProgramConstants;

      DtGlBuffer* myGpuShaderUbo;

      int myGpuShaderUboBinding;

      mutable bool myMutableShadersFailedToCompile;

      mutable double myStartTime;
      float myLastTimeFrame;
      
      const DtCullShaderConfig myCullShaderConfig;

      DtVector3<int> myWorkGroupLocalSize;

      DtDe& myDe;

      const DtIndirectRunTimeSettings& myIndirectRunTimeSettings;

      DtSkyObjectManager& mySkyObjectManager;

   protected:
      static const bool theDebugInstancesAppended;

      std::atomic<int> myNumUsers;

      static const bool myTrackObjects;

      struct TotalCounter
      {
      public:
         TotalCounter();
         virtual ~TotalCounter();
      public:
         std::atomic<int> myCount;
      };
      static TotalCounter theTotalCounter;
   };
}