include/vrvGraphics/DtEffect.h

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/******************************************************************************
** Copyright (c) 2010 MAK Technologies, Inc.
** All rights reserved.
******************************************************************************/


#pragma once

#include <vrvGraphics/vrvGraphics.h>

namespace makVrv
{
   class DT_DLL_VRVGRAPHICS DtEffect
   {
   public:

      struct VaryingAttributeAddress
      {
         VaryingAttributeAddress(const void* p, unsigned int t, unsigned int s)
         : pointer(p)
         , type(t)
         , size(s)
         {
         }

         const void* pointer; //Address 
         unsigned int type;   //The OpenGL type of the attribute.
         unsigned int size;   //The OpenGL width of the attribute 1-4
      };


      DtEffect();

      virtual ~DtEffect();

      void releaseResources();

      bool enabled() const;

      //Start using the effect. Returns true if the effect is enabled.
      bool enable();

      //Stop using the effect.
      void disable();

   protected:
      virtual void getShaderSource(const char*& vs,const char*& fs,const char*& gs) = 0;   
      virtual void updateUniformLocations() = 0;
      virtual void updateUniforms() = 0;

   protected:

      bool compileProgram(const char* vs,const char* fs,const char* gs);   

   protected:

      bool myEnabledFlag;
      unsigned int myProgram;
      unsigned int myVertexShader;
      unsigned int myFragmentShader;
   };

   class DT_DLL_VRVGRAPHICS DtEffectCreator
   {
   public:

      class CreateParameters
      {
         virtual ~CreateParameters()
         {
         }
      };

      DtEffectCreator();
      virtual ~DtEffectCreator();
      virtual DtEffect* create(CreateParameters* params = 0) = 0;
   };

}