OpenTTD Source  1.11.0-beta2
track_func.h
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1 /*
2  * This file is part of OpenTTD.
3  * OpenTTD is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, version 2.
4  * OpenTTD is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
5  * See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with OpenTTD. If not, see <http://www.gnu.org/licenses/>.
6  */
7 
10 #ifndef TRACK_FUNC_H
11 #define TRACK_FUNC_H
12 
13 #include "core/bitmath_func.hpp"
14 #include "track_type.h"
15 #include "direction_func.h"
16 #include "slope_func.h"
17 
27 #define FOR_EACH_SET_TRACK(var, track_bits) FOR_EACH_SET_BIT_EX(Track, var, TrackBits, track_bits)
28 
36 static inline bool IsValidTrack(Track track)
37 {
38  return track < TRACK_END;
39 }
40 
48 static inline bool IsValidTrackdirForRoadVehicle(Trackdir trackdir)
49 {
50  return trackdir < TRACKDIR_END;
51 }
52 
60 static inline bool IsValidTrackdir(Trackdir trackdir)
61 {
62  return trackdir != INVALID_TRACKDIR && ((1 << trackdir & TRACKDIR_BIT_MASK) != TRACKDIR_BIT_NONE);
63 }
64 
74 static inline Track AxisToTrack(Axis a)
75 {
76  assert(IsValidAxis(a));
77  return (Track)a;
78 }
79 
85 static inline TrackBits TrackToTrackBits(Track track)
86 {
87  assert(IsValidTrack(track));
88  return (TrackBits)(1 << track);
89 }
90 
96 static inline TrackBits AxisToTrackBits(Axis a)
97 {
98  return TrackToTrackBits(AxisToTrack(a));
99 }
100 
107 static inline TrackBits CornerToTrackBits(Corner corner)
108 {
109  extern const TrackBits _corner_to_trackbits[];
110  assert(IsValidCorner(corner));
111  return _corner_to_trackbits[corner];
112 }
113 
120 {
121  assert(IsValidTrackdir(trackdir));
122  return (TrackdirBits)(1 << trackdir);
123 }
124 
139 static inline Track RemoveFirstTrack(TrackBits *tracks)
140 {
141  if (*tracks != TRACK_BIT_NONE && *tracks != INVALID_TRACK_BIT) {
142  assert((*tracks & ~TRACK_BIT_MASK) == TRACK_BIT_NONE);
143  Track first = (Track)FIND_FIRST_BIT(*tracks);
144  ClrBit(*tracks, first);
145  return first;
146  }
147  return INVALID_TRACK;
148 }
149 
164 static inline Trackdir RemoveFirstTrackdir(TrackdirBits *trackdirs)
165 {
166  if (*trackdirs != TRACKDIR_BIT_NONE && *trackdirs != INVALID_TRACKDIR_BIT) {
167  assert((*trackdirs & ~TRACKDIR_BIT_MASK) == TRACKDIR_BIT_NONE);
168  Trackdir first = (Trackdir)FindFirstBit2x64(*trackdirs);
169  ClrBit(*trackdirs, first);
170  return first;
171  }
172  return INVALID_TRACKDIR;
173 }
174 
185 static inline Track FindFirstTrack(TrackBits tracks)
186 {
187  return (tracks != TRACK_BIT_NONE && tracks != INVALID_TRACK_BIT) ? (Track)FIND_FIRST_BIT(tracks) : INVALID_TRACK;
188 }
189 
201 static inline Track TrackBitsToTrack(TrackBits tracks)
202 {
203  assert(tracks == INVALID_TRACK_BIT || (tracks != TRACK_BIT_NONE && KillFirstBit(tracks & TRACK_BIT_MASK) == TRACK_BIT_NONE));
204  return tracks != INVALID_TRACK_BIT ? (Track)FIND_FIRST_BIT(tracks & TRACK_BIT_MASK) : INVALID_TRACK;
205 }
206 
219 static inline Trackdir FindFirstTrackdir(TrackdirBits trackdirs)
220 {
221  assert((trackdirs & ~TRACKDIR_BIT_MASK) == TRACKDIR_BIT_NONE);
222  return (trackdirs != TRACKDIR_BIT_NONE) ? (Trackdir)FindFirstBit2x64(trackdirs) : INVALID_TRACKDIR;
223 }
224 
225 /*
226  * Functions describing logical relations between Tracks, TrackBits, Trackdirs
227  * TrackdirBits, Direction and DiagDirections.
228  */
229 
240 {
241  assert(IsValidTrack(t));
242  return (Track)(t ^ 1);
243 }
244 
255 static inline Trackdir ReverseTrackdir(Trackdir trackdir)
256 {
257  assert(IsValidTrackdirForRoadVehicle(trackdir));
258  return (Trackdir)(trackdir ^ 8);
259 }
260 
270 static inline Track TrackdirToTrack(Trackdir trackdir)
271 {
272  assert(IsValidTrackdir(trackdir));
273  return (Track)(trackdir & 0x7);
274 }
275 
287 static inline Trackdir TrackToTrackdir(Track track)
288 {
289  assert(IsValidTrack(track));
290  return (Trackdir)track;
291 }
292 
303 {
304  Trackdir td = TrackToTrackdir(track);
306 }
307 
317 {
318  return (TrackBits)((bits | (bits >> 8)) & TRACK_BIT_MASK);
319 }
320 
328 {
329  return (TrackdirBits)(bits * 0x101);
330 }
331 
337 static inline bool HasTrack(TrackBits tracks, Track track)
338 {
339  assert(IsValidTrack(track));
340  return HasBit(tracks, track);
341 }
342 
348 static inline bool HasTrackdir(TrackdirBits trackdirs, Trackdir trackdir)
349 {
350  assert(IsValidTrackdir(trackdir));
351  return HasBit(trackdirs, trackdir);
352 }
353 
360 static inline TrackdirBits TrackStatusToTrackdirBits(TrackStatus ts)
361 {
362  return (TrackdirBits)(ts & TRACKDIR_BIT_MASK);
363 }
364 
371 static inline TrackBits TrackStatusToTrackBits(TrackStatus ts)
372 {
374 }
375 
384 static inline TrackdirBits TrackStatusToRedSignals(TrackStatus ts)
385 {
386  return (TrackdirBits)((ts >> 16) & TRACKDIR_BIT_MASK);
387 }
388 
396 static inline TrackStatus CombineTrackStatus(TrackdirBits trackdirbits, TrackdirBits red_signals)
397 {
398  return (TrackStatus)(trackdirbits | (red_signals << 16));
399 }
400 
411 static inline Trackdir NextTrackdir(Trackdir trackdir)
412 {
413  assert(IsValidTrackdir(trackdir));
414  extern const Trackdir _next_trackdir[TRACKDIR_END];
415  return _next_trackdir[trackdir];
416 }
417 
428 static inline TrackBits TrackCrossesTracks(Track track)
429 {
430  assert(IsValidTrack(track));
431  extern const TrackBits _track_crosses_tracks[TRACK_END];
432  return _track_crosses_tracks[track];
433 }
434 
447 static inline DiagDirection TrackdirToExitdir(Trackdir trackdir)
448 {
449  assert(IsValidTrackdirForRoadVehicle(trackdir));
450  extern const DiagDirection _trackdir_to_exitdir[TRACKDIR_END];
451  return _trackdir_to_exitdir[trackdir];
452 }
453 
469 static inline Trackdir TrackExitdirToTrackdir(Track track, DiagDirection diagdir)
470 {
471  assert(IsValidTrack(track));
472  assert(IsValidDiagDirection(diagdir));
473  extern const Trackdir _track_exitdir_to_trackdir[TRACK_END][DIAGDIR_END];
474  return _track_exitdir_to_trackdir[track][diagdir];
475 }
476 
495 {
496  assert(IsValidTrack(track));
497  assert(IsValidDiagDirection(diagdir));
498  extern const Trackdir _track_enterdir_to_trackdir[TRACK_END][DIAGDIR_END];
499  return _track_enterdir_to_trackdir[track][diagdir];
500 }
501 
507 {
508  assert(IsValidTrack(track));
509  assert(IsValidDirection(dir));
510  extern const Trackdir _track_direction_to_trackdir[TRACK_END][DIR_END];
511  return _track_direction_to_trackdir[track][dir];
512 }
513 
520 static inline Track DiagDirToDiagTrack(DiagDirection diagdir)
521 {
522  assert(IsValidDiagDirection(diagdir));
523  return (Track)(diagdir & 1);
524 }
525 
533 {
534  assert(IsValidDiagDirection(diagdir));
535  return TrackToTrackBits(DiagDirToDiagTrack(diagdir));
536 }
537 
546 {
547  assert(IsValidDiagDirection(diagdir));
548  extern const Trackdir _dir_to_diag_trackdir[DIAGDIR_END];
549  return _dir_to_diag_trackdir[diagdir];
550 }
551 
564 {
565  assert(IsValidDiagDirection(diagdir));
566  extern const TrackdirBits _exitdir_reaches_trackdirs[DIAGDIR_END];
567  return _exitdir_reaches_trackdirs[diagdir];
568 }
569 
582 
593 {
594  assert(IsValidTrackdir(trackdir));
595  extern const TrackdirBits _exitdir_reaches_trackdirs[DIAGDIR_END];
596  return _exitdir_reaches_trackdirs[TrackdirToExitdir(trackdir)];
597 }
598 /* Note that there is no direct table for this function (there used to be),
599  * but it uses two simpler tables to achieve the result */
600 
615 {
616  assert(IsValidTrackdirForRoadVehicle(trackdir));
617  extern const TrackdirBits _track_crosses_trackdirs[TRACK_END];
618  return _track_crosses_trackdirs[TrackdirToTrack(trackdir)];
619 }
620 
627 static inline bool IsDiagonalTrack(Track track)
628 {
629  assert(IsValidTrack(track));
630  return (track == TRACK_X) || (track == TRACK_Y);
631 }
632 
639 static inline bool IsDiagonalTrackdir(Trackdir trackdir)
640 {
641  assert(IsValidTrackdir(trackdir));
642  return IsDiagonalTrack(TrackdirToTrack(trackdir));
643 }
644 
645 
653 static inline bool TracksOverlap(TrackBits bits)
654 {
655  /* With no, or only one track, there is no overlap */
656  if (bits == TRACK_BIT_NONE || KillFirstBit(bits) == TRACK_BIT_NONE) return false;
657  /* We know that there are at least two tracks present. When there are more
658  * than 2 tracks, they will surely overlap. When there are two, they will
659  * always overlap unless they are lower & upper or right & left. */
660  return bits != TRACK_BIT_HORZ && bits != TRACK_BIT_VERT;
661 }
662 
670 static inline bool TrackOverlapsTracks(TrackBits tracks, Track track)
671 {
672  if (HasBit(tracks, track)) return true;
673  return TracksOverlap(tracks | TrackToTrackBits(track));
674 }
675 
681 static inline bool IsReversingRoadTrackdir(Trackdir dir)
682 {
683  assert(IsValidTrackdirForRoadVehicle(dir));
684  return (dir & 0x07) >= 6;
685 }
686 
692 static inline bool IsStraightRoadTrackdir(Trackdir dir)
693 {
694  assert(IsValidTrackdirForRoadVehicle(dir));
695  return (dir & 0x06) == 0;
696 }
697 
708 static inline bool IsUphillTrackdir(Slope slope, Trackdir dir)
709 {
710  assert(IsValidTrackdirForRoadVehicle(dir));
711  extern const TrackdirBits _uphill_trackdirs[];
712  return HasBit(_uphill_trackdirs[RemoveHalftileSlope(slope)], dir);
713 }
714 
722 static inline DiagDirection VehicleExitDir(Direction direction, TrackBits track)
723 {
725 
726  DiagDirection diagdir = DirToDiagDir(direction);
727 
728  /* Determine the diagonal direction in which we will exit this tile */
729  if (!HasBit(direction, 0) && track != state_dir_table[diagdir]) {
730  diagdir = ChangeDiagDir(diagdir, DIAGDIRDIFF_90LEFT);
731  }
732 
733  return diagdir;
734 }
735 
736 #endif /* TRACK_FUNC_H */
VehicleExitDir
static DiagDirection VehicleExitDir(Direction direction, TrackBits track)
Determine the side in which the vehicle will leave the tile.
Definition: track_func.h:722
TRACK_BIT_MASK
@ TRACK_BIT_MASK
Bitmask for the first 6 bits.
Definition: track_type.h:54
FindFirstTrackdir
static Trackdir FindFirstTrackdir(TrackdirBits trackdirs)
Returns first Trackdir from TrackdirBits or INVALID_TRACKDIR.
Definition: track_func.h:219
TRACK_BIT_NONE
@ TRACK_BIT_NONE
No track.
Definition: track_type.h:39
IsValidAxis
static bool IsValidAxis(Axis d)
Checks if an integer value is a valid Axis.
Definition: direction_func.h:43
Direction
Direction
Defines the 8 directions on the map.
Definition: direction_type.h:24
RemoveFirstTrackdir
static Trackdir RemoveFirstTrackdir(TrackdirBits *trackdirs)
Removes first Trackdir from TrackdirBits and returns it.
Definition: track_func.h:164
TrackdirBits
TrackdirBits
Enumeration of bitmasks for the TrackDirs.
Definition: track_type.h:101
DIAGDIR_END
@ DIAGDIR_END
Used for iterations.
Definition: direction_type.h:83
AxisToTrackBits
static TrackBits AxisToTrackBits(Axis a)
Maps an Axis to the corresponding TrackBits value.
Definition: track_func.h:96
TRACK_X
@ TRACK_X
Track along the x-axis (north-east to south-west)
Definition: track_type.h:21
KillFirstBit
static T KillFirstBit(T value)
Clear the first bit in an integer.
Definition: bitmath_func.hpp:239
HasBit
static bool HasBit(const T x, const uint8 y)
Checks if a bit in a value is set.
Definition: bitmath_func.hpp:103
DiagDirToDiagTrackdir
static Trackdir DiagDirToDiagTrackdir(DiagDirection diagdir)
Maps a (4-way) direction to the diagonal trackdir that runs in that direction.
Definition: track_func.h:545
ClrBit
static T ClrBit(T &x, const uint8 y)
Clears a bit in a variable.
Definition: bitmath_func.hpp:151
DIAGDIRDIFF_90LEFT
@ DIAGDIRDIFF_90LEFT
90 degrees left
Definition: direction_type.h:108
TracksOverlap
static bool TracksOverlap(TrackBits bits)
Checks if the given tracks overlap, ie form a crossing.
Definition: track_func.h:653
RemoveHalftileSlope
static Slope RemoveHalftileSlope(Slope s)
Removes a halftile slope from a slope.
Definition: slope_func.h:60
IsValidDiagDirection
static bool IsValidDiagDirection(DiagDirection d)
Checks if an integer value is a valid DiagDirection.
Definition: direction_func.h:21
RemoveFirstTrack
static Track RemoveFirstTrack(TrackBits *tracks)
Removes first Track from TrackBits and returns it.
Definition: track_func.h:139
INVALID_TRACKDIR_BIT
@ INVALID_TRACKDIR_BIT
Flag for an invalid trackdirbit value.
Definition: track_type.h:117
TRACK_BIT_UPPER
@ TRACK_BIT_UPPER
Upper track.
Definition: track_type.h:42
TrackToTrackBits
static TrackBits TrackToTrackBits(Track track)
Maps a Track to the corresponding TrackBits value.
Definition: track_func.h:85
TRACK_BIT_RIGHT
@ TRACK_BIT_RIGHT
Right track.
Definition: track_type.h:45
bitmath_func.hpp
TRACK_BIT_VERT
@ TRACK_BIT_VERT
Left and right track.
Definition: track_type.h:48
TrackdirReachesTrackdirs
static TrackdirBits TrackdirReachesTrackdirs(Trackdir trackdir)
Maps a trackdir to the trackdirs that can be reached from it (ie, when entering the next tile.
Definition: track_func.h:592
DirToDiagDir
static DiagDirection DirToDiagDir(Direction dir)
Convert a Direction to a DiagDirection.
Definition: direction_func.h:166
TrackBitsToTrack
static Track TrackBitsToTrack(TrackBits tracks)
Converts TrackBits to Track.
Definition: track_func.h:201
TRACK_Y
@ TRACK_Y
Track along the y-axis (north-west to south-east)
Definition: track_type.h:22
AxisToTrack
static Track AxisToTrack(Axis a)
Convert an Axis to the corresponding Track AXIS_X -> TRACK_X AXIS_Y -> TRACK_Y Uses the fact that the...
Definition: track_func.h:74
ChangeDiagDir
static DiagDirection ChangeDiagDir(DiagDirection d, DiagDirDiff delta)
Applies a difference on a DiagDirection.
Definition: direction_func.h:149
IsValidTrack
static bool IsValidTrack(Track track)
Checks if a Track is valid.
Definition: track_func.h:36
slope_func.h
TrackBitsToTrackdirBits
static TrackdirBits TrackBitsToTrackdirBits(TrackBits bits)
Converts TrackBits to TrackdirBits while allowing both directions.
Definition: track_func.h:327
TrackStatusToTrackBits
static TrackBits TrackStatusToTrackBits(TrackStatus ts)
Returns the present-track-information of a TrackStatus.
Definition: track_func.h:371
TrackdirToExitdir
static DiagDirection TrackdirToExitdir(Trackdir trackdir)
Maps a trackdir to the (4-way) direction the tile is exited when following that trackdir.
Definition: track_func.h:447
IsDiagonalTrack
static bool IsDiagonalTrack(Track track)
Checks if a given Track is diagonal.
Definition: track_func.h:627
TrackToOppositeTrack
static Track TrackToOppositeTrack(Track t)
Find the opposite track to a given track.
Definition: track_func.h:239
Corner
Corner
Enumeration of tile corners.
Definition: slope_type.h:22
CornerToTrackBits
static TrackBits CornerToTrackBits(Corner corner)
Returns a single horizontal/vertical trackbit that is in a specific tile corner.
Definition: track_func.h:107
FindFirstBit2x64
static uint8 FindFirstBit2x64(const int value)
Finds the position of the first non-zero bit in an integer.
Definition: bitmath_func.hpp:216
TrackExitdirToTrackdir
static Trackdir TrackExitdirToTrackdir(Track track, DiagDirection diagdir)
Maps a track and an (4-way) dir to the trackdir that represents the track with the exit in the given ...
Definition: track_func.h:469
DiagDirToDiagTrack
static Track DiagDirToDiagTrack(DiagDirection diagdir)
Maps a (4-way) direction to the diagonal track incidating with that diagdir.
Definition: track_func.h:520
TrackdirCrossesTrackdirs
static TrackdirBits TrackdirCrossesTrackdirs(Trackdir trackdir)
Maps a trackdir to all trackdirs that make 90 deg turns with it.
Definition: track_func.h:614
DiagdirReachesTracks
static TrackBits DiagdirReachesTracks(DiagDirection diagdir)
Returns all tracks that can be reached when entering a tile from a given (diagonal) direction.
Definition: track_func.h:581
CombineTrackStatus
static TrackStatus CombineTrackStatus(TrackdirBits trackdirbits, TrackdirBits red_signals)
Builds a TrackStatus.
Definition: track_func.h:396
IsValidDirection
static bool IsValidDirection(Direction d)
Checks if an integer value is a valid Direction.
Definition: direction_func.h:32
INVALID_TRACKDIR
@ INVALID_TRACKDIR
Flag for an invalid trackdir.
Definition: track_type.h:89
Slope
Slope
Enumeration for the slope-type.
Definition: slope_type.h:48
DiagDirection
DiagDirection
Enumeration for diagonal directions.
Definition: direction_type.h:77
IsValidTrackdirForRoadVehicle
static bool IsValidTrackdirForRoadVehicle(Trackdir trackdir)
Checks if a Trackdir is valid for road vehicles.
Definition: track_func.h:48
TRACK_BIT_LOWER
@ TRACK_BIT_LOWER
Lower track.
Definition: track_type.h:43
INVALID_TRACK_BIT
@ INVALID_TRACK_BIT
Flag for an invalid trackbits value.
Definition: track_type.h:57
TrackOverlapsTracks
static bool TrackOverlapsTracks(TrackBits tracks, Track track)
Check if a given track is contained within or overlaps some other tracks.
Definition: track_func.h:670
DiagdirReachesTrackdirs
static TrackdirBits DiagdirReachesTrackdirs(DiagDirection diagdir)
Returns all trackdirs that can be reached when entering a tile from a given (diagonal) direction.
Definition: track_func.h:563
TRACK_END
@ TRACK_END
Used for iterations.
Definition: track_type.h:27
TRACK_BIT_HORZ
@ TRACK_BIT_HORZ
Upper and lower track.
Definition: track_type.h:47
TRACKDIR_BIT_NONE
@ TRACKDIR_BIT_NONE
No track build.
Definition: track_type.h:102
IsValidCorner
static bool IsValidCorner(Corner corner)
Rangecheck for Corner enumeration.
Definition: slope_func.h:24
TRACK_BIT_LEFT
@ TRACK_BIT_LEFT
Left track.
Definition: track_type.h:44
DIR_END
@ DIR_END
Used to iterate.
Definition: direction_type.h:34
TrackToTrackdirBits
static TrackdirBits TrackToTrackdirBits(Track track)
Returns a TrackdirBit mask from a given Track.
Definition: track_func.h:302
TrackStatusToRedSignals
static TrackdirBits TrackStatusToRedSignals(TrackStatus ts)
Returns the red-signal-information of a TrackStatus.
Definition: track_func.h:384
TRACKDIR_END
@ TRACKDIR_END
Used for iterations.
Definition: track_type.h:88
TrackDirectionToTrackdir
static Trackdir TrackDirectionToTrackdir(Track track, Direction dir)
Maps a track and a full (8-way) direction to the trackdir that represents the track running in the gi...
Definition: track_func.h:506
TrackStatusToTrackdirBits
static TrackdirBits TrackStatusToTrackdirBits(TrackStatus ts)
Returns the present-trackdir-information of a TrackStatus.
Definition: track_func.h:360
IsUphillTrackdir
static bool IsUphillTrackdir(Slope slope, Trackdir dir)
Checks whether a trackdir on a specific slope is going uphill.
Definition: track_func.h:708
TrackEnterdirToTrackdir
static Trackdir TrackEnterdirToTrackdir(Track track, DiagDirection diagdir)
Maps a track and an (4-way) dir to the trackdir that represents the track with the entry in the given...
Definition: track_func.h:494
FindFirstTrack
static Track FindFirstTrack(TrackBits tracks)
Returns first Track from TrackBits or INVALID_TRACK.
Definition: track_func.h:185
HasTrack
static bool HasTrack(TrackBits tracks, Track track)
Checks whether a TrackBits has a given Track.
Definition: track_func.h:337
TrackBits
TrackBits
Bitfield corresponding to Track.
Definition: track_type.h:38
TrackdirToTrackdirBits
static TrackdirBits TrackdirToTrackdirBits(Trackdir trackdir)
Maps a Trackdir to the corresponding TrackdirBits value.
Definition: track_func.h:119
DiagDirToDiagTrackBits
static TrackBits DiagDirToDiagTrackBits(DiagDirection diagdir)
Maps a (4-way) direction to the diagonal track bits incidating with that diagdir.
Definition: track_func.h:532
Axis
Axis
Allow incrementing of DiagDirDiff variables.
Definition: direction_type.h:123
ReverseTrackdir
static Trackdir ReverseTrackdir(Trackdir trackdir)
Maps a trackdir to the reverse trackdir.
Definition: track_func.h:255
IsReversingRoadTrackdir
static bool IsReversingRoadTrackdir(Trackdir dir)
Checks whether the trackdir means that we are reversing.
Definition: track_func.h:681
Trackdir
Trackdir
Enumeration for tracks and directions.
Definition: track_type.h:70
TRACKDIR_BIT_MASK
@ TRACKDIR_BIT_MASK
Bitmask for bit-operations.
Definition: track_type.h:116
NextTrackdir
static Trackdir NextTrackdir(Trackdir trackdir)
Maps a trackdir to the trackdir that you will end up on if you go straight ahead.
Definition: track_func.h:411
TrackCrossesTracks
static TrackBits TrackCrossesTracks(Track track)
Maps a track to all tracks that make 90 deg turns with it.
Definition: track_func.h:428
Track
Track
These are used to specify a single track.
Definition: track_type.h:19
HasTrackdir
static bool HasTrackdir(TrackdirBits trackdirs, Trackdir trackdir)
Checks whether a TrackdirBits has a given Trackdir.
Definition: track_func.h:348
TrackdirBitsToTrackBits
static TrackBits TrackdirBitsToTrackBits(TrackdirBits bits)
Discards all directional information from a TrackdirBits value.
Definition: track_func.h:316
FIND_FIRST_BIT
#define FIND_FIRST_BIT(x)
Returns the first non-zero bit in a 6-bit value (from right).
Definition: bitmath_func.hpp:200
IsValidTrackdir
static bool IsValidTrackdir(Trackdir trackdir)
Checks if a Trackdir is valid for non-road vehicles.
Definition: track_func.h:60
IsStraightRoadTrackdir
static bool IsStraightRoadTrackdir(Trackdir dir)
Checks whether the given trackdir is a straight road.
Definition: track_func.h:692
track_type.h
direction_func.h
IsDiagonalTrackdir
static bool IsDiagonalTrackdir(Trackdir trackdir)
Checks if a given Trackdir is diagonal.
Definition: track_func.h:639
TrackdirToTrack
static Track TrackdirToTrack(Trackdir trackdir)
Returns the Track that a given Trackdir represents.
Definition: track_func.h:270
TrackToTrackdir
static Trackdir TrackToTrackdir(Track track)
Returns a Trackdir for the given Track.
Definition: track_func.h:287
INVALID_TRACK
@ INVALID_TRACK
Flag for an invalid track.
Definition: track_type.h:28