texture.h

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/****************************************************************************
* VCGLib                                                            o o     *
* Visual and Computer Graphics Library                            o     o   *
*                                                                _   O  _   *
* Copyright(C) 2004                                                \/)\/    *
* Visual Computing Lab                                            /\/|      *
* ISTI - Italian National Research Council                           |      *
*                                                                    \      *
* All rights reserved.                                                      *
*                                                                           *
* This program is free software; you can redistribute it and/or modify      *   
* it under the terms of the GNU General Public License as published by      *
* the Free Software Foundation; either version 2 of the License, or         *
* (at your option) any later version.                                       *
*                                                                           *
* This program 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 General Public License (http://www.gnu.org/licenses/gpl.txt)          *
* for more details.                                                         *
*                                                                           *
****************************************************************************/


#ifndef __VCG_TRI_UPDATE_TEXTURE
#define __VCG_TRI_UPDATE_TEXTURE

//#include <vcg/space/plane.h>

namespace vcg {
namespace tri {



template <class ComputeMeshType>
class UpdateTexture
{

public:
typedef ComputeMeshType MeshType; 
typedef typename MeshType::ScalarType     ScalarType;
typedef typename MeshType::VertexType     VertexType;
typedef typename MeshType::VertexPointer  VertexPointer;
typedef typename MeshType::VertexIterator VertexIterator;
typedef typename MeshType::FaceType       FaceType;
typedef typename MeshType::FacePointer    FacePointer;
typedef typename MeshType::FaceIterator   FaceIterator;

static void WedgeTexFromPlane(ComputeMeshType &m, const Point3<ScalarType> &uVec, const Point3<ScalarType> &vVec, bool aspectRatio, ScalarType sideGutter=0.0)
{
        Box2f bb;

        FaceIterator fi;
        for(fi=m.face.begin();fi!=m.face.end();++fi)
                if(!(*fi).IsD()) 
                {
                        for(int i=0;i<3;++i)
                        {
                                (*fi).WT(i).U()= (*fi).V(i)->cP() * uVec;
                                (*fi).WT(i).V()= (*fi).V(i)->cP() * vVec;
                                bb.Add((*fi).WT(i).P());
                        }
                }       

        ScalarType wideU =  bb.max[0]- bb.min[0];
        ScalarType wideV =  bb.max[1]- bb.min[1];

        if (sideGutter>0.0)
        {
                ScalarType deltaGutter = std::min(wideU, wideV) * min(sideGutter, (ScalarType)0.5);

                bb.max[0] += deltaGutter;
                bb.min[0] -= deltaGutter;
                bb.max[1] += deltaGutter;
                bb.min[1] -= deltaGutter;

                wideU = bb.max[0] - bb.min[0];
                wideV = bb.max[1] - bb.min[1];
        }

        if (aspectRatio) {
                wideU = std::max(wideU, wideV);
                wideV = wideU;
        }

        for (fi = m.face.begin(); fi != m.face.end(); ++fi)
        if (!(*fi).IsD())
        {
                for (int i = 0; i<3; ++i)
                {
                        (*fi).WT(i).U() = ((*fi).WT(i).U() - bb.min[0]) / wideU;
                        (*fi).WT(i).V() = ((*fi).WT(i).V() - bb.min[1]) / wideV;
                }
        }
}

static void WedgeTexFromCamera(ComputeMeshType &m, Plane3<ScalarType> &pl)
{
        
}

static void WedgeTexFromVertexTex(ComputeMeshType &m)
{
  for(FaceIterator fi=m.face.begin();fi!=m.face.end();++fi)
          if(!(*fi).IsD())
              {
               for(int i=0;i<3;++i)
               {
                 (*fi).WT(i).U() = (*fi).V(i)->T().U();
                 (*fi).WT(i).V() = (*fi).V(i)->T().V();
               }
              }
}


static void WedgeTexRemoveNull(ComputeMeshType &m, const std::string &texturename)
{
        bool found=false;
        
        FaceIterator fi;
        // first loop lets check that there are -1 indexed textured face
        for(fi=m.face.begin();fi!=m.face.end();++fi)
                if(!(*fi).IsD()) if((*fi).WT(0).N()==-1) found = true;
        
        if(!found) return;
        m.textures.push_back(texturename);
        
        int nullId=m.textures.size()-1;
        
        for(fi=m.face.begin();fi!=m.face.end();++fi)
                if(!(*fi).IsD()) if((*fi).WT(0).N()==-1)                
                {
                        (*fi).WT(0).N() = nullId;
                        (*fi).WT(1).N() = nullId;
                        (*fi).WT(2).N() = nullId;                       
                }                                                                                       
                        
}

}; // end class

}       // End namespace
}       // End namespace


#endif