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GlContextData.h

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/*************** <auto-copyright.pl BEGIN do not edit this line> **************
 *
 * VR Juggler is (C) Copyright 1998-2003 by Iowa State University
 *
 * Original Authors:
 *   Allen Bierbaum, Christopher Just,
 *   Patrick Hartling, Kevin Meinert,
 *   Carolina Cruz-Neira, Albert Baker
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Library General Public
 * License as published by the Free Software Foundation; either
 * version 2 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Library General Public License for more details.
 *
 * You should have received a copy of the GNU Library General Public
 * License along with this library; if not, write to the
 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
 * Boston, MA 02111-1307, USA.
 *
 * -----------------------------------------------------------------
 * File:          $RCSfile: GlContextData.h,v $
 * Date modified: $Date: 2003/12/08 14:29:42 $
 * Version:       $Revision: 1.35 $
 * -----------------------------------------------------------------
 *
 *************** <auto-copyright.pl END do not edit this line> ***************/

#ifndef _VRJ_GL_CONTEXT_DATA_H_
#define _VRJ_GL_CONTEXT_DATA_H_
//#pragma once

#include <vrj/vrjConfig.h>
#include <vector>
#include <vrj/Draw/OGL/GlDrawManager.h>
#include <vrj/Util/Debug.h>
#include <vpr/Thread/TSObjectProxy.h>

namespace vrj
{

class GlContextDataBase
{
protected:
   int getCurContext()
   {
      return GlDrawManager::instance()->getCurrentContext();
   }
};


template<class ContextDataType = int>
class GlContextData : private GlContextDataBase
{
public:
   GlContextData()
   {;}

   ContextDataType& operator*()
   { return (*getPtrToCur()); }

   ContextDataType* operator->()
   { return getPtrToCur(); }

   std::vector<ContextDataType*>* getDataVector()
   {
      return &(mThreadSpecificContextData->mContextDataVector);
   }

protected:
   template<class DataType>
   struct ThreadContextData
   {
   public:
      ThreadContextData()
         : mContextDataVector()
      {;}

      /* Makes sure that the vector is at least requiredSize large */
      void checkSize(unsigned requiredSize)
      {
         if(requiredSize > mContextDataVector.size())
         {
            mContextDataVector.reserve(requiredSize);          // Resize smartly
            while(mContextDataVector.size() < requiredSize)    // Add any new items needed
            {  mContextDataVector.push_back(new DataType()); }
         }
      }

      std::vector<DataType*> mContextDataVector;   
   };


   ContextDataType* getPtrToCur()
   {
      // Get current context
      int context_id = getCurContext();
      ThreadContextData<ContextDataType>* thread_specific_context_data = &(*mThreadSpecificContextData);    // Cache ref for better performance

      thread_specific_context_data->checkSize(context_id+1);     // Make sure we are large enough (+1 since we have index)

      return thread_specific_context_data->mContextDataVector[context_id];
   }

private:
   vpr::TSObjectProxy<ThreadContextData<ContextDataType> >  mThreadSpecificContextData;
};

}

#endif

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