progShader.h

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//////////////////////////////////////////////////////////////////////
// 6/13/02      Aaron Lefohn    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

#ifndef PROGRAMMABLE_SHADER_H__
#define PROGRAMMABLE_SHADER_H__

#include "stateGLI.h"
#include "../texCoordGen/texCoordGen.h"
#include "../texCoordGen/texCoordPerturb.h"

namespace glift {

//////////////////////////////////////////////////////////////////////////
///
/// ProgShader - A wrapper class for a programmable shader.
/// 
///////////////////////////////////////////////////////////////////////
/// Final. Not intended to be subclassed
class _export_ ProgShader : 
   public StateGLI, 
   public MultiTexCoordGen
{
public:
   ProgShader( int numTexUnits, PixelShader*  pixShader,  TexCoordPerturb* texCoordPerturb=NULL );
   ProgShader( int numTexUnits, VertexShader* vertShader, TexCoordPerturb* texCoordPerturb=NULL );
   ProgShader( int numTexUnits, PixelShader*  pixShader,  VertexShader* vertShader, TexCoordPerturb* texCoordPerturb=NULL );
   ProgShader( const ProgShader& rhs );
   ProgShader& operator=( const ProgShader& rhs );
   ~ProgShader();

   void setPixelShader(   PixelShader* shader ) {m_pixelShader = shader;}
   void setVertexShader(  VertexShader* shader) {m_vertexShader = shader;}

   /// The 'MultiTexCrdGenerator' interface
   /// Generate appropriate texture coordinates, taking into account 
   /// multiTexturing, texCoordTransforms, and texture contants
   MultiTexCoord* genTexCoords( const gutz::arrayw2f& rawTexCoord, const gutz::vec3f& primScale ) const;

   //Constant Accessors
   int   numTexUnits() {return m_numTexUnits;}

protected:
   virtual void bindDef();
   virtual void releaseDef();

private:
   int                           m_numTexUnits;
   PixelShader*  m_pixelShader;
   VertexShader*         m_vertexShader;
   TexCoordPerturb* m_texCoordPerturb;

   ProgShader();
   void initMembers( const ProgShader& rhs );
   void initMembers( int numTexUnits, PixelShader*  pixShader, VertexShader* vertShader, 
      TexCoordPerturb* texCoordPerturb );
};

typedef gutz::SmartPtr<ProgShader> ProgShaderSP;

//////////////////////////////////////////////////////////////////////////////////
/// Factory functions <progShaderFactory.cpp>
///  these allow you to specify an alternate error stream, if you don't set it
///  the default will be used.
//////////////////////////////////////////////////////////////////////////////////

ProgShaderSP getProgShaderFromFile(const char *fileName, std::ostream *es = 0);
ProgShaderSP getProgShaderFromText(const char *progText, std::ostream *es = 0);


} /// End of namespace glift

#endif

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