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#ifndef PATHFIND_H
#define PATHFIND_H
typedef struct TrackPathFinder TrackPathFinder;
typedef bool TPFEnumProc(uint tile, void *data, int track, uint length, byte *state);
typedef void TPFAfterProc(TrackPathFinder *tpf);
#define PATHFIND_GET_LINK_OFFS(tpf, link) ((byte*)(link) - (byte*)tpf->links)
#define PATHFIND_GET_LINK_PTR(tpf, link_offs) (TrackPathFinderLink*)((byte*)tpf->links + (link_offs))
/* y7 y6 y5 y4 y3 y2 y1 y0 x7 x6 x5 x4 x3 x2 x1 x0
* y7 y6 y5 y4 y3 y2 y1 y0 x4 x3 x2 x1 x0 0 0 0
* 0 0 y7 y6 y5 y4 y3 y2 y1 y0 x4 x3 x2 x1 x0 0
* 0 0 0 0 y5 y4 y3 y2 y1 y0 x4 x3 x2 x1 x0 0
*/
#define PATHFIND_HASH_TILE(tile) (GET_TILE_X(tile) & 0x1F) + ((GET_TILE_Y(tile)&0x1F)<<5)
typedef struct TrackPathFinderLink {
TileIndex tile;
uint16 flags;
uint16 next;
} TrackPathFinderLink;
typedef struct RememberData {
uint16 cur_length;
byte depth;
byte pft_var6;
} RememberData;
struct TrackPathFinder {
int num_links_left;
TrackPathFinderLink *new_link;
TPFEnumProc *enum_proc;
void *userdata;
RememberData rd;
int the_dir;
byte tracktype;
byte var2;
bool disable_tile_hash;
bool hasbit_13;
uint16 hash_head[0x400];
TileIndex hash_tile[0x400]; /* stores the link index when multi link. */
TrackPathFinderLink links[0x400]; /* hopefully, this is enough. */
};
void FollowTrack(uint tile, uint16 flags, byte direction, TPFEnumProc *enum_proc, TPFAfterProc *after_proc, void *data);
typedef struct {
uint tile;
int length;
} FindLengthOfTunnelResult;
FindLengthOfTunnelResult FindLengthOfTunnel(uint tile, int direction);
void NewTrainPathfind(uint tile, byte direction, TPFEnumProc *enum_proc, void *data, byte *cache);
#endif /* PATHFIND_H */
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