OpenTTD-patches/pathfind.h
ludde 3e97dda275 (svn r2635) Fix: [ntp/misc] Improve the old pathfinder. Changed it to A* instead of Dijkstra.
- Benchmark shows that NTP is now around 10x faster than NPF.
  - Made IsTunnelTile macro to determine if a tile is a tunnel.
  - Added some useful debugging functions for making tiles red / getting accurate timestamps.
  - Remove old depot finding algorithm.
  - Disable warning for signed/unsigned comparisons.
2005-07-19 11:42:40 +00:00

70 lines
1.9 KiB
C

#ifndef PATHFIND_H
#define PATHFIND_H
//#define PF_BENCH // perform simple benchmarks on the train pathfinder (not
//supported on all archs)
typedef struct TrackPathFinder TrackPathFinder;
typedef bool TPFEnumProc(TileIndex tile, void *data, int track, uint length, byte *state);
typedef void TPFAfterProc(TrackPathFinder *tpf);
typedef bool NTPEnumProc(TileIndex tile, void *data, int track, uint length);
#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) (TileX(tile) & 0x1F) + ((TileY(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(TileIndex tile, uint16 flags, byte direction, TPFEnumProc *enum_proc, TPFAfterProc *after_proc, void *data);
typedef struct {
TileIndex tile;
int length;
} FindLengthOfTunnelResult;
FindLengthOfTunnelResult FindLengthOfTunnel(TileIndex tile, int direction);
void NewTrainPathfind(TileIndex tile, TileIndex dest, byte direction, NTPEnumProc *enum_proc, void *data);
#endif /* PATHFIND_H */