mirror of https://github.com/OpenTTD/OpenTTD.git
113 lines
3.5 KiB
C
113 lines
3.5 KiB
C
/* $Id$ */
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/** @file pathfind.h The oldest pathfinder that's supported. */
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#ifndef PATHFIND_H
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#define PATHFIND_H
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#include "direction_type.h"
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enum {
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STR_FACTOR = 2,
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DIAG_FACTOR = 3
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};
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//#define PF_BENCH // perform simple benchmarks on the train pathfinder (not
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//supported on all archs)
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struct TrackPathFinder;
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typedef bool TPFEnumProc(TileIndex tile, void *data, Trackdir trackdir, uint length);
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typedef void TPFAfterProc(TrackPathFinder *tpf);
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typedef bool NTPEnumProc(TileIndex tile, void *data, int track, uint length);
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#define PATHFIND_GET_LINK_OFFS(tpf, link) ((byte*)(link) - (byte*)tpf->links)
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#define PATHFIND_GET_LINK_PTR(tpf, link_offs) (TrackPathFinderLink*)((byte*)tpf->links + (link_offs))
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/* y7 y6 y5 y4 y3 y2 y1 y0 x7 x6 x5 x4 x3 x2 x1 x0
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* y7 y6 y5 y4 y3 y2 y1 y0 x4 x3 x2 x1 x0 0 0 0
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* 0 0 y7 y6 y5 y4 y3 y2 y1 y0 x4 x3 x2 x1 x0 0
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* 0 0 0 0 y5 y4 y3 y2 y1 y0 x4 x3 x2 x1 x0 0
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*/
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#define PATHFIND_HASH_TILE(tile) (TileX(tile) & 0x1F) + ((TileY(tile) & 0x1F) << 5)
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struct TrackPathFinderLink {
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TileIndex tile;
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uint16 flags;
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uint16 next;
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};
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struct RememberData {
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uint16 cur_length;
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byte depth;
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Track last_choosen_track;
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};
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struct TrackPathFinder {
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int num_links_left;
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TrackPathFinderLink *new_link;
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TPFEnumProc *enum_proc;
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void *userdata;
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RememberData rd;
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TrackdirByte the_dir;
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TransportType tracktype;
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uint sub_type;
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bool disable_tile_hash;
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uint16 hash_head[0x400];
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TileIndex hash_tile[0x400]; ///< stores the link index when multi link.
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TrackPathFinderLink links[0x400]; ///< hopefully, this is enough.
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};
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/** Some flags to modify the behaviour of original pathfinder */
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enum PathfindFlags {
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PATHFIND_FLAGS_NONE = 0,
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PATHFIND_FLAGS_SHIP_MODE = 0x0800, ///< pathfinder with some optimizations for ships, but does not work for other types.
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PATHFIND_FLAGS_DISABLE_TILE_HASH = 0x1000, ///< do not check for searching in circles
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};
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DECLARE_ENUM_AS_BIT_SET(PathfindFlags)
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void FollowTrack(TileIndex tile, PathfindFlags flags, TransportType tt, uint sub_type, DiagDirection direction, TPFEnumProc *enum_proc, TPFAfterProc *after_proc, void *data);
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void NewTrainPathfind(TileIndex tile, TileIndex dest, RailTypes railtypes, DiagDirection direction, NTPEnumProc *enum_proc, void *data);
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/**
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* Calculates the tile of given station that is closest to a given tile
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* for this we assume the station is a rectangle,
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* as defined by its top tile (st->train_tile) and its width/height (st->trainst_w, st->trainst_h)
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* @param station The station to calculate the distance to
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* @param tile The tile from where to calculate the distance
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* @return The closest station tile to the given tile.
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*/
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static inline TileIndex CalcClosestStationTile(StationID station, TileIndex tile)
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{
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const Station *st = Station::Get(station);
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/* If the rail station is (temporarily) not present, use the station sign to drive near the station */
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if (st->train_tile == INVALID_TILE) return st->xy;
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uint minx = TileX(st->train_tile); // topmost corner of station
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uint miny = TileY(st->train_tile);
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uint maxx = minx + st->trainst_w - 1; // lowermost corner of station
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uint maxy = miny + st->trainst_h - 1;
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/* we are going the aim for the x coordinate of the closest corner
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* but if we are between those coordinates, we will aim for our own x coordinate */
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uint x = ClampU(TileX(tile), minx, maxx);
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/* same for y coordinate, see above comment */
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uint y = ClampU(TileY(tile), miny, maxy);
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/* return the tile of our target coordinates */
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return TileXY(x, y);
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}
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#endif /* PATHFIND_H */
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