planarQuad.cpp

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/////////////////////////////////////////////////////////////////////
// 6/7/02       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
////////////////////////////////////////////////////////////////////////
//
// PlanarQuad.cpp: implementation of the PlanarQuad class.
//
/////////////////////////////////////////////////////////////////////

#include <drawable/planarQuad.h>
#include <iostream>

using namespace std;
using namespace gutz;

using namespace glift;

PlanarQuad::PlanarQuad( const vec2f& lowerLeft, const vec2f& upperRight, 
                       bool genTexCoords, bool genNorms, TexCoordGen* texGen )
{
   init( lowerLeft, upperRight, 0.0f, genTexCoords, genNorms, texGen );
}


PlanarQuad::PlanarQuad( const vec2f& lowerLeft, const vec2f& upperRight, float z,  
                       bool genTexCoords, bool genNorms, TexCoordGen* texGen )
{
   init( lowerLeft, upperRight, z, genTexCoords, genNorms, texGen );
}

void PlanarQuad::init( const vec2f lowerLeft, const vec2f upperRight, float z,
                      bool genTexCoords, bool genNorms, TexCoordGen* texGen )
{
   m_lowerLeft = lowerLeft;
   m_upperRight = upperRight;
   m_z = z;

   bool createdTexGen = false;
   if( genTexCoords && texGen==NULL )  {
      texGen = new QuadTexGen();
      createdTexGen = true;
   }
   else if( genTexCoords==false && texGen ) {
      err() << "PlanarQuad(...) Error:\n"
         << "\tIllegal to disable texCoordGeneration and pass\n"
         << "\tin alternate texCoordGenerator.\n";
      exit(1);
   }

   arrayo2f     vert = setQuadVertPos( lowerLeft, upperRight, z);
   arrayo2f     texCoord = genTexCoords ? texGen->genTexCoords(vert, vec3f()) : arrayo2f();
   vec3f                scale( upperRight.x, upperRight.y, 1.0 );
   arrayo2f     norms = genNorms ? setNorm() : arrayo2f();

   WrappedPrim::init( new QuadsGL( vert, texCoord, scale, norms, arrayo1ui(), arrayo2f(), arrayo1ub(), GLIFT_DRAW_ARR ) );

   if( createdTexGen ) { delete texGen; }
}

arrayo2f PlanarQuad::setQuadVertPos( const vec2f& lowerLeft, const vec2f& upperRight, float z )
{
   GLfloat data[12] = { lowerLeft.x,  lowerLeft.y,  z,
      upperRight.x, lowerLeft.y,  z,
      upperRight.x, upperRight.y, z,
      lowerLeft.x,  upperRight.y, z };

   return arrayo2f(4, 3, data);         /// 4 vertices, 3 dimensions per vertex
}

arrayo2f PlanarQuad::setNorm()
{
   GLfloat data[12] = { 0.0f, 0.0f, 1.0f,
      0.0f, 0.0f, 1.0f,
      0.0f, 0.0f, 1.0f,
      0.0f, 0.0f, 1.0f };

   return arrayo2f(4, 3, data); /// 4 vertices, 3 dimensions per vertex
}

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