drawAlgorithm.h

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//////////////////////////////////////////////////////////////////////
// 6/28/02      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 GLIFT_DRAW_ALGORITHM_H
#define GLIFT_DRAW_ALGORITHM_H

#include <iostream>
#include <arrayGutz.h>
#include <GL/glew.h>
#include "../core/gliftObject.h"
#include "../texCoordGen/texCoordGen.h"

namespace glift {

   /// TODO: Extend this as more algorithm subclasses are defined
enum DrawAlg { GLIFT_DRAW_IMM, GLIFT_DRAW_ARR };

/////////////////////////////////////////////////////////////////////////
///
/// DrawAlgorithm - Interface for an OpenGL Drawing algorithm
/// 
/// - Intended to be created using the 'DrawAlg' enumeration 
///   and the 'makeDrawAlg( DrawAlg type )' factory function.
/// - Essentially a functor but with ->draw(...) syntax
/// - TODO: These really should all be Singleton classes...
///
/// Base class
class DrawAlgorithm : public GliftObject
{
public:
   virtual void draw( GLenum primType,
      const gutz::arrayw2f& vert, 
      const MultiTexCoord* curTexCoords,
      const gutz::arrayw2f& norm, 
      const gutz::arrayw2f& color, 
      const gutz::arrayw1ub& edgeFlag,
      const gutz::arrayw1ui* curIndices ) = 0;
};

/// DrawAlgImm - Standard OpenGL drawing algorithm. 
class DrawAlgImm : public DrawAlgorithm
{
public:
   virtual void draw( GLenum primType, 
      const gutz::arrayw2f& vert, 
      const MultiTexCoord* curTexCoords,
      const gutz::arrayw2f& norm, 
      const gutz::arrayw2f& color, 
      const gutz::arrayw1ub& edgeFlag,
      const gutz::arrayw1ui* curIndices );

private:
   void draw( int vertNum, const gutz::arrayw2f& vert, const MultiTexCoord* curTexCoords, 
      const gutz::arrayw2f& norm, const gutz::arrayw2f& color, 
      const gutz::arrayw1ub& edgeFlag );

   void setVertPos( const gutz::arrayw2f& vert, int vertNum );
   void setTexCoords( const MultiTexCoord* curTexCoords, GLint vertNum );
   void outputTexCoords( const MultiTexCoord& texCoords, int texCoordDimen, 
      int texUnit, int vertNum );
};

/// DrawAlgArr - Vertex Array OpenGL drawing algorithm.
/// NOTE: Assumes that all necessary arrays have been enabled!!!
class DrawAlgArr : public DrawAlgorithm
{
public:
   virtual void draw( GLenum primType, 
      const gutz::arrayw2f& vert, 
      const MultiTexCoord* curTexCoords,
      const gutz::arrayw2f& norm, 
      const gutz::arrayw2f& color, 
      const gutz::arrayw1ub& edgeFlag,
      const gutz::arrayw1ui* curIndices );

   void enable( const gutz::arrayw2f& vert, const MultiTexCoord* curTexCoords,
      const gutz::arrayw2f& norm, const gutz::arrayw2f& color, 
      const gutz::arrayw1ub& edgeFlag );
   void disable( const gutz::arrayw2f& vert, const MultiTexCoord* curTexCoords,
      const gutz::arrayw2f& norm, const gutz::arrayw2f& color, 
      const gutz::arrayw1ub& edgeFlag );
};

/// Factory function
inline DrawAlgorithm* makeDrawAlg( DrawAlg type ) 
{
   DrawAlgorithm* drawAlg = NULL;       

   switch(type) {
case GLIFT_DRAW_IMM: drawAlg = new DrawAlgImm(); break;
case GLIFT_DRAW_ARR: drawAlg = new DrawAlgArr(); break;
default:                         drawAlg = new DrawAlgImm(); break;
   }

   return drawAlg;
}

} /// End of namespace glift

#endif

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