emptyTex.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 GLIFT_EMPTY_TEXTURE_H__
#define GLIFT_EMPTY_TEXTURE_H__

#include "singleTex.h"
#include <GL/glew.h>

namespace glift {

//////////////////////////////////////////////////////////////////////////
///
/// EmptyTex - A dummy class that serves to enable/disable a texture unit
//                        that is to be used for textureCoords only and has no texture
//                        associated with it.
///
///////////////////////////////////////////////////////////////////////

class _export_ EmptyTex : public CoreTex
{
public:
   EmptyTex(); //GL_TEXTURE_2D on unit 0.
   EmptyTex( GLenum texDimenName, int texUnit );
   EmptyTex( const EmptyTex& rhs );
   EmptyTex& operator=(const EmptyTex& rhs);
   virtual ~EmptyTex();

   /// Set the texture unit
   void texUnit(int t)                                                  {m_texUnit = t;}

   /// Accessors
   int                          texUnit() const                 {return m_texUnit;}
   virtual PBuffGlift*  pbuff() const                   {return NULL; }         
   virtual gutz::vec3i  dimen() const                   {return gutz::vec3i(); }        
   virtual bool                 tryToBindPbuff() const  {return false; }

   /// Set Funcs (will issue error message and die)
   virtual void setTexData( TexData* texData, int mipLevel=0, bool setTexSize=true ); 
   virtual void resetTexState( const VecTexState& texState );   
   virtual void tryToBindPbuff( bool tryToUsePbuff );
   virtual void copyToTex( int mipLevel, const gutz::vec3i& texOrig, 
      const gutz::vec2i& screenOrig, const gutz::vec2i& copySize   );


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

private:
   int  m_texUnit;

   void initMembers( int texUnit );
   void initMembers( const EmptyTex& rhs );
   void checkTexUnit( GLuint texUnit );
};

} /// End of namespace glift

#endif

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