texTrans.cpp

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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
////////////////////////////////////////////////////////////////////////

#include <texCoordGen/texTrans.h>

using namespace gutz;

using namespace glift;

TexTrans::TexTrans()
: m_texUnit(0), m_transform( CoordTrans() )
{}

TexTrans::TexTrans( uint texUnit ) /// Identity transform
: m_texUnit(texUnit), m_transform( CoordTrans() )
{}

TexTrans::TexTrans( uint texUnit, const vec2f& bias, bool relBias )
: m_texUnit(texUnit), m_transform( CoordTrans(bias, relBias) )
{}

TexTrans::TexTrans( uint texUnit, const vec3f& bias, bool relBias )
: m_texUnit(texUnit), m_transform( CoordTrans(bias, relBias) )
{}

TexTrans::TexTrans( uint texUnit, const mat4f& mat, bool relScale, bool relBias )
: m_texUnit(texUnit), m_transform( CoordTrans(mat, relScale, relBias) )
{}

TexTrans::TexTrans( uint texUnit, const vec3f& scale, const vec3f& bias, bool relScale, bool relBias )
: m_texUnit(texUnit), m_transform( CoordTrans(scale, bias, relScale, relBias) )
{}

arrayo2f TexTrans::operator()( const arrayw2f& rawTexCoord, const vec3f& primScale )
{
   /// Note: There is a lot of type-casting and copying in this function b/c I am not
   ///       using arrays-of-arrays. I am intentionally trading efficiency in this function for 
   ///       runtime, rendering efficiency by using a contiguous memory layout all for
   ///       2D ararys (vertex info).

   int numVerts = rawTexCoord.dim(0);
   int coordDimen = rawTexCoord.dim(1);

   arrayo2f texCoords( numVerts, coordDimen, (float)0 );

   for(int v=0; v < numVerts; v++) {
      arrayo1f newCoord = m_transform.apply( rawTexCoord[v], arrayo1f(3, primScale.v() ) );

      for(int c=0; c < coordDimen; c++) {
         texCoords[v][c] = newCoord[c];
      }
   }

   return texCoords;
}

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