ShObjMesh.hpp

// Sh: A GPU metaprogramming language.
//
// Copyright 2003-2005 Serious Hack Inc.
// 
// 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., 51 Franklin Street, Fifth Floor, Boston, 
// MA  02110-1301, USA
#ifndef SHUTIL_SHOBJMESH_HPP
#define SHUTIL_SHOBJMESH_HPP

#include <iosfwd>

#include "sh.hpp"
#include "ShMesh.hpp"

namespace ShUtil {

using namespace SH;

struct ShObjVertex; 
struct ShObjFace;
struct ShObjEdge;

typedef ShMeshType<ShObjVertex, ShObjFace, ShObjEdge> ShObjMeshType;

struct ShObjVertex: public ShMeshVertex<ShObjMeshType> {
  ShPoint3f pos; // vertex position

  ShObjVertex(const ShPoint3f &p);
};

struct ShObjFace: public ShMeshFace<ShObjMeshType> {
  ShNormal3f normal; // face normal
};

struct ShObjEdge: public ShMeshEdge<ShObjMeshType> {
  // properties for start vertex in this edge's face
  ShNormal3f normal;  
  ShVector3f tangent;
  ShTexCoord2f texcoord;
};

/* OBJ file mesh where each vertex stores its position,
 * Each edge stores the normal/tc/tangent for its start vertex,
 * and each face stores its face normal
 *
 * Each face in the object mesh is a triangle. (Triangulation
 * happens on loading from the OBJ file)
 */
class ShObjMesh: public ShMesh<ShObjMeshType> {
  public:
    typedef ShMesh<ShObjMeshType> ParentType;

    ShObjMesh();

    ShObjMesh(std::istream &in);

    std::istream& readObj(std::istream &in);

    void generateFaceNormals();

    int generateVertexNormals(bool force = false);

    int generateTangents(bool force = false);

    int generateSphericalTexCoords(bool force = false);

    void normalizeNormals();

    void consolidateVertices();

    friend std::istream& operator>>(std::istream &in, ShObjMesh &mesh);
};

}

#endif

---