#ifndef _GRSKIDMARKS_H_
#define _GRSKIDMARKS_H_
#define DELTATSTRIP 0.3f
#define MAXPOINT_BY_STRIP 600
#define MAXSTRIP_BYWHEEL  40
#define DIST_INTERVAL     0.2f

#define SKID_UNUSED  1
#define SKID_BEGIN   2
#define SKID_RUNNING 3
#define SKID_STOPPED 4

extern int grSkidMaxStripByWheel;
extern int grSkidMaxPointByStrip;
extern double grSkidDeltaT;

typedef struct 
{
  ssgVertexArray	**vtx; /* the strips */
  ssgVtxTableShadow	**vta;
  ssgTexCoordArray  **tex; 
  ssgColourArray        **clr;
	sgVec4 smooth_colour;
	int			*state;
  int			*size;
  double		timeStrip;
  int			running_skid;
  int			next_skid;
  int			last_state_of_skid;
  int			skid_full;
  float         tex_state;
}tgrSkidStrip;

typedef struct 
{
  ssgVtxTable	*base; /* to remember the pos of the wheel line before transform */
  tgrSkidStrip	strips[4]; /* the strips of the four wheels*/
}tgrSkidmarks;

extern void grInitSkidmarks(tCarElt *car);
extern void grUpdateSkidmarks(tCarElt *car, double t);
extern void grShutdownSkidmarks (void);
extern void grDrawSkidmarks (tCarElt *car);

#endif /* _GRSKIDMARKS_*/