--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/pathfind.h	Tue Jan 02 19:19:48 2007 +0000
@@ -0,0 +1,77 @@
+/* $Id$ */
+
+#ifndef PATHFIND_H
+#define PATHFIND_H
+
+#include "direction.h"
+
+enum {
+	STR_FACTOR  = 2,
+	DIAG_FACTOR = 3
+};
+
+//#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, DiagDirection direction, TPFEnumProc* enum_proc, TPFAfterProc* after_proc, void* data);
+
+typedef struct {
+	TileIndex tile;
+	int length;
+} FindLengthOfTunnelResult;
+FindLengthOfTunnelResult FindLengthOfTunnel(TileIndex tile, DiagDirection direction);
+
+void NewTrainPathfind(TileIndex tile, TileIndex dest, RailTypeMask railtypes, DiagDirection direction, NTPEnumProc* enum_proc, void* data);
+
+#endif /* PATHFIND_H */