DtEffectRenderer.h

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


#pragma once

#include <vrvGraphics/DtFormatRenderer.h>
#include <vrvGraphics/DtEffect.h>
#include <cstddef>

namespace makVrv
{
   template <typename MemberType>
   struct DtAttributeType;

   template <>
   struct DtAttributeType<float>
   {
      enum { size = 1 };
      enum { value = GL_FLOAT };
   };
   template <>
   struct DtAttributeType<float[2]>
   {
      enum { size = 2 };
      enum { value = GL_FLOAT };
   };
   template <>
   struct DtAttributeType<float[3]>
   {
      enum { size = 3 };
      enum { value = GL_FLOAT };
   };
   template <>
   struct DtAttributeType<float[4]>
   {
      enum { size = 4 };
      enum { value = GL_FLOAT };
   };

   template <>
   struct DtAttributeType<int>
   {
      enum { size = 1 };
      enum { value = GL_INT };
   };
   template <>
   struct DtAttributeType<int[2]>
   {
      enum { size = 2 };
      enum { value = GL_INT };
   };
   template <>
   struct DtAttributeType<int[3]>
   {
      enum { size = 3 };
      enum { value = GL_INT };
   };
   template <>
   struct DtAttributeType<int[4]>
   {
      enum { size = 4 };
      enum { value = GL_INT };
   };

   template <>
   struct DtAttributeType<unsigned int>
   {
      enum { size = 1 };
      enum { value = GL_UNSIGNED_INT };
   };
   template <>
   struct DtAttributeType<unsigned int[2]>
   {
      enum { size = 2 };
      enum { value = GL_UNSIGNED_INT };
   };
   template <>
   struct DtAttributeType<unsigned int[3]>
   {
      enum { size = 3 };
      enum { value = GL_UNSIGNED_INT };
   };
   template <>
   struct DtAttributeType<unsigned int[4]>
   {
      enum { size = 4 };
      enum { value = GL_UNSIGNED_INT };
   };  

   class DtEffect;
   template <typename VertexFormat> 
   class DtEffectRenderer : public DtFormatRenderer<VertexFormat>
   {
   public:

      template <typename MemberType>
      static DtEffect::VertexAttribPtrInfo VaryingAttribute(
         const VertexFormat* base, const MemberType VertexFormat::* member)
      {
         return DtEffect::VertexAttribPtrInfo(
            reinterpret_cast<const GLvoid*>(&(base->*member)),
            DtAttributeType<MemberType>::value,
            DtAttributeType<MemberType>::size);
      }

      DtEffectRenderer(DtEffect* effect)
      : myEffect(effect)
      {
         myEffect->enable();
      }

      virtual ~DtEffectRenderer()
      {  
         if(myEffect->enabled())
         {
            myEffect->disable();
         }
      }

   protected:
      DtEffect* myEffect;
   };
}