texTrans.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_TEX_TRANSFORM_H
#define GLIFT_TEX_TRANSFORM_H

#include "../util/coordTrans.h"
#include "texCoordGen.h"
#include <mathGutz.h>
#include <arrayGutz.h>
#include <vector>

namespace glift {

class TexTrans;
typedef std::vector<TexTrans>           VecTexTrans;
typedef std::vector<TexTrans*>          VecTexTransP;
typedef std::vector<VecTexTrans>        VecVecTexTrans;
typedef std::vector<VecTexTransP>       VecVecTexTransP;


/////////////////////////////////////////////////////////////////////////
///
/// TexTrans - Encapsulation of a scale/bias linear transform on raw
///                   texture coordinates.
///     
///     - The default constructor makes the identity transform.
/// 
//////////////////////////////////////////////////////////////////////
class TexTrans : public TexCoordGen
{
public:
   TexTrans();                                  /// Identity transform on texUnit = 0
   TexTrans( uint texUnit );    /// Identity transform on 'texUnits'
   TexTrans( uint texUnit, const gutz::vec2f& bias,  bool relBias=false );
   TexTrans( uint texUnit, const gutz::vec3f& bias,  bool relBias=false );
   TexTrans( uint texUnit, const gutz::mat4f& mat,   bool relScale=false, bool relTrans=false );
   TexTrans( uint texUnit, const gutz::vec3f& scale, const gutz::vec3f& bias,   bool relScale, bool relBias );

   uint  texUnit() const { return m_texUnit; }

   /// Apply transform to all coords specified in 'rawTexCoords'
   /// Divide scale and/or bias transform by 'primScale' if requested.
   virtual gutz::arrayo2f operator()( const gutz::arrayw2f& rawTexCoords, const gutz::vec3f& primScale );

private:
   uint         m_texUnit;
   CoordTrans   m_transform;

   virtual gutz::arrayo2f operator()() { return gutz::arrayw2f(); } //Dissallow default call.
};

} /// End of namespace glift

#endif

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