TriangleMesh.h

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/**
 *\file         TriangleMesh.h
 *
 *\brief        For reading from an obj 3D model file.
 *
 *\author       Xianming Chen\n
 *              Computer Science Department\n
 *              University of Utah
 *
 *\date         11 Jul 2004\n
 *              Copyright (c) 2004, University of Utah
 */


#ifndef _TRIANGLEMESH_H
#define _TRIANGLEMESH_H

#include "BBox.h"
#include "Canvas.h"
#include <vector>
#include <GL/glut.h>

namespace columbia
{
  struct TriangleFace
  {
      TriangleFace(int I, int J, int K, int Ti=-1, int Tj=-1, int Tk=-1, int Ni=-1, int Nj=-1, int Nk=-1) : 
        i(I), j(J), k(K), ti(Ti), tj(Tj), tk(Tk), ni(Ni), nj(Nj), nk(Nk) { }
      int i, j, k;                                               // indices of 3 vertices.
      int ni, nj, nk;                                            // indices of 3 normals.
      int ti, tj, tk;                                            // indices of 3 tex coords.
  };
  
  struct TriangleMesh
  {
      TriangleMesh(const char* obj_fname);
      TriangleMesh()       { }
      
      void glDraw() const;
      void SetTexImage(Canvas* tex)      { texImage = tex;  initTexture(); }
      
      void init();
      void initTexture();

      std :: vector<Vertex> V;           // vertex (x, y, z)
      std :: vector<Vector> N;           // normal (x, y, z)
      std :: vector<Vertex> T;           // texture (s, t, w)
      std :: vector<TriangleFace> F;     // triangle (i, j, k)
      int total_triangles;
      bool has_normal;
      BBox bbox;

      bool has_texture;
      GLuint texName;
      Canvas* texImage;
  };

  inline ostream& operator<< (ostream& os, TriangleMesh const& msh)
  {
    for(int i=0; i<msh.V.size(); i++)
    {
      os << "v " << msh.V[i].x << " " << msh.V[i].y << " " << msh.V[i].z << endl;
    }
    os << endl;

    for(int i=0; i<msh.N.size(); i++)
    {
      os << "vn " << msh.N[i].x << " " << msh.N[i].y << " " << msh.N[i].z << endl;
    }
    os << endl;

    for(int i=0; i<msh.T.size(); i++)
    {
      os << "vt " << msh.T[i].x << " " << msh.T[i].y << " " << msh.T[i].z << endl;
    }
    os << endl;

    for(int i=0; i<msh.F.size(); i++)
    {
      if(msh.has_normal && msh.has_texture)
      {
        os << "f ";
        os << msh.F[i].i+1 << "/" << msh.F[i].ti+1 << "/" << msh.F[i].ni+1 << " ";
        os << msh.F[i].j+1 << "/" << msh.F[i].tj+1 << "/" << msh.F[i].nj+1 << " ";
        os << msh.F[i].k+1 << "/" << msh.F[i].tk+1 << "/" << msh.F[i].nk+1 << endl;
      }
      else if(msh.has_texture)
        os << "f " << msh.F[i].i+1 << "/" << msh.F[i].ti+1 << " " << msh.F[i].j+1 << "/" << msh.F[i].tj+1 << " " << msh.F[i].k+1 << "/" << msh.F[i].tk+1 << endl;
      else if(msh.has_normal)
        os << "f " << msh.F[i].i+1 << "//" << msh.F[i].ni+1 << " " << msh.F[i].j+1 << "//" << msh.F[i].nj+1 << " " << msh.F[i].k+1 << "//" << msh.F[i].nk+1 << endl;
      else
        os << "f " << msh.F[i].i+1 << " " << msh.F[i].j+1 <<  " " << msh.F[i].k+1 << endl;
    }
    os << endl;
    return os;
  }
    

}//end namespace xchen


#endif

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