DtProgramConstants.h

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/*****************************************************************************
 * Copyright (c) 2020 MAK Technologies, Inc.
 * All rights reserved.
 *****************************************************************************/


#pragma once

#include <vrvGraphicsUtils/DtVector4.h>
#include <vrvGraphicsUtils/DtVector3.h>
#include <vrvGraphicsUtils/DtVector2.h>
#include <vrvGraphicsUtils/DtMatrix4.h>

namespace makVrv
{
   class DtGlProgram;

   template<class T>
   class DtValueAndLoc
   {
   public:
      T val = {};
      int loc = -1;
   };

   class DtUboValueSetters
   {
   public:
      template<typename T>
      void setValue(unsigned char* pData, const DtValueAndLoc<DtVector4<T>>& src)
      {
         if (src.loc != -1)
         {
            memcpy(pData + src.loc, src.val.ptr(), sizeof(DtVector4<T>));
         }
      }

      template<typename T>
      void setValue(unsigned char* pData, const DtValueAndLoc<DtMatrix4<T>>& src)
      {
         if (src.loc != -1)
         {
            memcpy(pData + src.loc, src.val.ptr(), sizeof(DtMatrix4<T>));
         }
      }

      template<typename T>
      void setValue(unsigned char* pData, const DtValueAndLoc<T>& src)
      {
         if (src.loc != -1)
         {
            memcpy(pData + src.loc, &src.val, sizeof(T));
         }
      }

      template<typename T>
      void setValue(unsigned char* pData, const DtValueAndLoc<DtVector2<T>>& src)
      {
         if (src.loc != -1)
         {
            memcpy(pData + src.loc, src.val.ptr(), sizeof(T) * 2);
         }
      }
   };

   class DtProgramConstants
   {
   public:
      virtual void init(const DtGlProgram* program) = 0;
   protected:

      virtual void reset(void) = 0;
   };
}