// MeshX.h
// NKU CSC 480/580 - Kirby
// ---------------------------------------------------------
// An simple immutable class for representing a mesh,
// using the .X format with Mesh {... MeshNormals{...}}.
// ---------------------------------------------------------

#ifndef MESH_H
#define MESH_H

#include "Geometry.h"
#include <vector>
#include <fstream>
using namespace std ;
using namespace csc480 ;




class Mesh
{
public:
    explicit Mesh( ifstream& meshfile ) ;
    void dump( ostream& out ) const ; 

    // Vertex inspectors
    int getNumVertices() const                 { return (int) _vertices.size() ; }
    const Point3& getVertex( int i ) const     { return _vertices.at(i) ; } 
    double getBoundingRadius() const           { return _radius ; } 

    // Normal inspectors
    int getNumNormals() const                  { return (int) _normals.size() ; }
    const Vector3& getNormal( int j ) const    { return _normals.at( j ) ; }

    // Face inspectors
    int getNumFaces() const                    { return (int) _facesToVertices.size() ; }
    const vector<int>& getFaceV( int j ) const { return _facesToVertices.at(j ) ; }
    const vector<int>& getFaceN( int j ) const { return _facesToNormals.at(j ) ; }

    // Create an OpenGL display list.
    int makeDisplayList() const ; 


private:
    vector< Point3 >        _vertices ;        // arbitrary xyz 
    vector< Vector3 >       _normals ;         // assumed to be pre-normalized in file
    vector< vector<int> >   _facesToVertices ; //_faceToVertices[j][k]==i means jth vertex in face k is vertex i
    vector< vector<int> >   _facesToNormals ;  // faceToNormals[j][k]==i  means jth normal in face k is normal i
    double                  _radius ;          // distance to origin of most distant vertex.
} ;


/*
Constructor, dump(), and makeDisplayList() are defined in file Mesh.cpp.
*/


#endif