include/vrvGraphics/DtBufferObject.h

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/******************************************************************************
** Copyright (c) 2009 MAK Technologies, Inc.
** All rights reserved.
******************************************************************************/


#pragma once

#include <vrvGraphics/vrvGraphics.h>

namespace makVrv
{

   class DT_DLL_VRVGRAPHICS DtBufferObject
   {
   public:

      enum ArrayType
      {
         Vertex3,
         Vertex4,
         Color3,
         Color4,
         Normal,
         TextureCoordinate
      };

      enum Usage
      {
         Static,  //Data hardly changes
         Dynamic, //Data frequently changes
         Stream  //Data usually changes
      };

      DtBufferObject(Usage usage );

      ~DtBufferObject();

      //Change the size of the buffer.
      void resize(unsigned int sizeBytes);

      //Get the buffer's size
      unsigned int size() const;

      inline unsigned int objectId() const { return myVertexBufferObjectId; }

      //Set the size and initialize the buffer with data.
      void setData(const float* data, unsigned int sizeBytes);

      //Upload a subsection of data starting at the offset for count floats,
      //Either resize or setData must be called before uploading data.
      void uploadData(unsigned int offsetBytes, unsigned int sizeBytes,const float* data);

      //Bind the buffer for use.
      void bind(ArrayType type, unsigned int stride = 0, unsigned int offset = 0, 
         unsigned int textureUnit = 0);

      //Unbind the buffer for use.
      void unbind(ArrayType type,unsigned int textureUnit = 0);

   protected:
      unsigned int myVertexBufferObjectId;
      unsigned int myUsage;
      unsigned int mySize;

   };

}