DtIndirectClearBufferProgram.h

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


#pragma once

#include <vrvOsg/vrvOsg.h>

#include <vrvUtil/DtVirtualBaseClass.h>

#include <vrvMath/DtVector3.h>

#include <tbb/atomic.h>

namespace makVrv
{
   class DtGlBuffer;
   class DtGlProgram;

   class DT_DLL_VRVOSG DtIndirectClearBufferProgram : public DtVirtualBaseClass
   {
   public:
      DtIndirectClearBufferProgram(DtDe& de);

      virtual ~DtIndirectClearBufferProgram();

      static DtIndirectClearBufferProgram* instance(DtDe& de);

   public:
      DtIndirectClearBufferProgram() = delete;
      DtIndirectClearBufferProgram(const DtIndirectClearBufferProgram&) = delete;
      DtIndirectClearBufferProgram& operator=(const DtIndirectClearBufferProgram&) = delete;

   public:
      virtual void clearBuffer(DtGlBuffer* buffer, unsigned int clearValue);

      virtual void deleteShaders();

      virtual void incrementNumUsers();

      virtual void decrementNumUsers();

   protected:
      virtual void initializeShadersIfNecessary(void);
   protected:
      DtGlProgram* myClearProgram;

      DtVector3<int> myWorkGroupLocalSize;

      tbb::atomic<int> myNumUsers;

      int myBufferSizeLoc;
      int myClearValueLoc;

      DtDe& myDe;

   protected:
      static const std::string theShaderFilePath;
   };
}