typedef struct _Marker_t Marker;#ifndef MAIN_H#define MAIN_H#include <string>#include <vector>#include <AR/arMulti.h>#include <GL/gl.h>#define DEBUG 1struct _Marker_t {  std::string	name;  int		id;  bool		visible;  bool		was_visible;  int		near_id;  double	width;  double	center[2];  double	trans[3][4];};#ifdef USE_CG#  include <Cg/cgGL.h>extern CGcontext cgContext;#endifextern std::vector< Marker * > floater_markers;extern ARMultiMarkerInfoT *multi_markers;extern Marker *current_marker;extern int xsize, ysize; extern int threshold;extern int videopassthrough;extern int fullscreen;extern int grabinput;extern char *videofile;extern char *videoout;extern GLdouble projectionMatrix[16];extern GLint viewport[4];extern double aspectRatio;void cleanup();void quit();void reload();Marker * findMarker( const char * );#endif /* MAIN_H */