progShaderFactory.cpp

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//////////////////////////////////////////////////////////////////////
// 7/15/03      Joe M. Kniss    Scientific Computing and Imaging Institute
// School of Computing          University of Utah
//
//  This library is free software; you can redistribute it and/or
//  modify it under the terms of the GNU Lesser General Public
//  License as published by the Free Software Foundation; either
//  version 2.1 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
//  Lesser General Public License for more details.
//
//  You should have received a copy of the GNU Lesser 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
/////////////////////////////////////////////////////////////////////////
//
// ProgShaderFactory - Functions for generating progammable Shaders
// 
//////////////////////////////////////////////////////////////////////


///ProgShaderFactory.cpp
///  TODO: keep up the pace with new prog shader extensions
///  TODO: add parsing for NVparse and ATIShaders in text form

#include "progShader.h"
#include "fragProgARB.h"
#include "vertexProgARB.h"
#include <iostream>
#include <fstream>
#include <string>


using namespace std;

namespace glift {
//////////////////////////////////////////////////////////////////////////
/// get Prog from file
//////////////////////////////////////////////////////////////////////////

ProgShaderSP getProgShaderFromFile(const char *fileName, std::ostream *es)
{
   /// gota handle this better!!!
   ifstream f(fileName);
   string stxt;
   /// get first line of shader
   f >> stxt;
   f.close();

   /// an arb fragment program detected
   if(stxt.find("!!ARBfp1.0") >= 0)
   {
      FragProgARB *fp = new FragProgARB(fileName,true,0,true);

      ostream *ossave;
      if(es)
      {
         /// save off old error stream
         ossave = fp->getErrStream();
         /// capture init errors
         fp->setErrStream(es);
      }
 
      fp->init();
      
      /// return the program's default error stream
      if(es)
      {
         fp->setErrStream(ossave);
      }

      return ProgShaderSP((ProgShader*)fp);

   }
   /// an arb vertex program
   else if(stxt.find("!!ARBvp1.0") >= 0)
   {
      VertexProgARB *vp = new VertexProgARB(fileName,true,0,true);

      ostream *ossave;
      if(es)
      {
         /// save off old error stream
         ossave = vp->getErrStream();
         /// capture init errors
         vp->setErrStream(es);
      }
 
      vp->init();
      
      /// return the program's default error stream
      if(es)
      {
         vp->setErrStream(ossave);
      }

      return ProgShaderSP((ProgShader*)vp);
   }


   return ProgShaderSP(0);
}

//////////////////////////////////////////////////////////////////////////
/// get Prog from text
//////////////////////////////////////////////////////////////////////////
ProgShaderSP getProgShaderFromText(const char *progText, std::ostream *es)
{
   string stxt(progText);

   /// an arb fragment program detected
   if(stxt.find("!!ARBfp1.0") >= 0)
   {
      FragProgARB *fp = new FragProgARB(progText,false,0,true);

      ostream *ossave;
      if(es)
      {
         /// save off old error stream
         ossave = fp->getErrStream();
         /// capture init errors
         fp->setErrStream(es);
      }
 
      fp->init();
      
      /// return the program's default error stream
      if(es)
      {
         fp->setErrStream(ossave);
      }

      return ProgShaderSP((ProgShader*)fp);

   }
   /// an arb vertex program
   else if(stxt.find("!!ARBvp1.0") >= 0)
   {
      VertexProgARB *vp = new VertexProgARB(progText,false,0,true);

      ostream *ossave;
      if(es)
      {
         /// save off old error stream
         ossave = vp->getErrStream();
         /// capture init errors
         vp->setErrStream(es);
      }
 
      vp->init();
      
      /// return the program's default error stream
      if(es)
      {
         vp->setErrStream(ossave);
      }

      return ProgShaderSP((ProgShader*)vp);
   }

   return ProgShaderSP(0);
}

}/// end namespace glift

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