// This file is part of libigl, a simple c++ geometry processing library.
// 
// Copyright (C) 2013 Alec Jacobson <alecjacobson@gmail.com>
// 
// This Source Code Form is subject to the terms of the Mozilla Public License 
// v. 2.0. If a copy of the MPL was not distributed with this file, You can 
// obtain one at http://mozilla.org/MPL/2.0/.
#ifndef IGL_READOFF_H
#define IGL_READOFF_H
#include "igl_inline.h"
// History:
//  return type changed from void to bool  Alec 18 Sept 2011

#ifndef IGL_NO_EIGEN
#  include <Eigen/Core>
#endif
#include <string>
#include <vector>
#include <cstdio>

namespace igl 
{
  
  // Read a mesh from an ascii OFF file, filling in vertex positions, normals
  // and texture coordinates. Mesh may have faces of any number of degree
  //
  // Templates:
  //   Scalar  type for positions and vectors (will be read as double and cast
  //     to Scalar)
  //   Index  type for indices (will be read as int and cast to Index)
  // Inputs:
  //  str  path to .obj file
  // Outputs:
  //   V  double matrix of vertex positions  #V by 3
  //   F  #F list of face indices into vertex positions
  //   N  list of vertex normals #V by 3
  //   C  list of rgb color values per vertex #V by 3
  // Returns true on success, false on errors
  template <typename Scalar, typename Index>
  IGL_INLINE bool readOFF(
    const std::string off_file_name, 
    std::vector<std::vector<Scalar > > & V,
    std::vector<std::vector<Index > > & F,
    std::vector<std::vector<Scalar > > & N,
    std::vector<std::vector<Scalar > > & C);
  // Inputs:
  //   off_file  pointer to already opened .off file 
  // Outputs:
  //   off_file  closed file
  template <typename Scalar, typename Index>
  IGL_INLINE bool readOFF(
    FILE * off_file,
    std::vector<std::vector<Scalar > > & V,
    std::vector<std::vector<Index > > & F,
    std::vector<std::vector<Scalar > > & N,
    std::vector<std::vector<Scalar > > & C);
  
  
#ifndef IGL_NO_EIGEN
  // read mesh from a ascii off file
  // Inputs:
  //   str  path to .off file
  // Outputs:
  //   V  eigen double matrix #V by 3
  //   F  eigen int matrix #F by 3
  template <typename DerivedV, typename DerivedF>
  IGL_INLINE bool readOFF(
    const std::string str,
    Eigen::PlainObjectBase<DerivedV>& V,
    Eigen::PlainObjectBase<DerivedF>& F);

  template <typename DerivedV, typename DerivedF>
  IGL_INLINE bool readOFF(
    const std::string str,
    Eigen::PlainObjectBase<DerivedV>& V,
    Eigen::PlainObjectBase<DerivedF>& F,
    Eigen::PlainObjectBase<DerivedV>& N);
#endif

}

#ifndef IGL_STATIC_LIBRARY
#  include "readOFF.cpp"
#endif

#endif