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enum {
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	/* levels */
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	Empty		= 0,
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	Background,
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	Wall,
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	Cargo,
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	Goal,
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	GoalCargo,
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	Glenda,
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	/* movements */
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	Up,
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	Down,
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	Left,
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	Right,
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};
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enum {
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	/* glenda faces the horizontal direction she's moving in */
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	GLeft	= 0,
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	GRight 	= 1,
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};
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enum {
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	MazeX = 20,
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	MazeY = 18,
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	BoardX = 49,
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	BoardY = 49,
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	SizeX = MazeX*BoardX+10,
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	SizeY = MazeY*BoardY+10,
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	Maxlevels = 200,
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};
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typedef struct Step {
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	uint dir;		/* direction */
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	uint count;	/* number of single-step moves */
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} Step;
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typedef struct Route {
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	uint nstep;	/* number of valid Step */
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	Step *step;
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	Point dest;	/* result of step */
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} Route;
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typedef struct Walk {
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	uint nroute;	/* number of valid Route* */
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	Route **route;
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	uint beyond;	/* number of allocated Route* */
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} Walk;
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typedef struct Visited {
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	uint 	board[MazeX][MazeY];
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} Visited;
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typedef struct Animation {
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	Route* route;
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	Step *step;
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	int count;
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} Animation;
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typedef struct {
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	Point 	glenda;
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	Point 	max;		/* that's how much the board spans */
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	uint 	index;
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	uint	done;
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	uint 	board[MazeX][MazeY];
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} Level;
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Level level;		/* the current level */
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Level levels[Maxlevels];	/* all levels from this file */
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int numlevels;		/* how many levels do we have */
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Image *img;		/* buffer */
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Image *text;		/* for text messages */
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Image *win;
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Image *goal;
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Image *cargo;
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Image *goalcargo;
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Image *wall;
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Image *empty;
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Image *gleft;
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Image *gright;
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Image *glenda;
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Image *bg;
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/* graphics.c */
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void drawscreen(void);
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void drawlevel(void);
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void drawwin(void);
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void drawglenda(void);
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void drawboard(Point);
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void resize(Point);
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Point boardsize(Point);
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/* level.c */
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int loadlevels(char *);
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/* move.c */
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void move(int);
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/* route.c */
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int validpush(Point, Step*, Point*);
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int isvalid(Point, Route*, int (*)(Point, Step*, Point*));
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void freeroute(Route*);
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Route* extend(Route*, int, int, Point);
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Route* findroute(Point, Point);
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/* animation.c */
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void initanimation(Animation*);
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void setupanimation(Animation*, Route*);
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int onestep(Animation*);
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void stopanimation(Animation*);
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/* sokoban.c */
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char *genlevels(int);
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Image *eallocimage(Rectangle, int, uint);