(svn r2448) General cleanup of rail related code, more to follow.
* Add: rail.[ch] for rail-related enums and wrapper functions. * Codechange: Removed dozens of magic numbers with below enums. * Codechange: Rewrote CheckTrackCombination(). * Add: TILE_SIZE, TILE_PIXELS and TILE_HEIGHT constants. * Add: enums RailTileType, RailTileSubtype, SignalType to mask against the map arrays. * Add: enums Track, TrackBits, Trackdir, TrackdirBits for railway track data. (Note that the old RAIL_BIT constants are replaced by TRACK_BIT ones). * Add: enums Direction and DiagDirection * Codechange: Moved a bunch of track(dir) related lookup arrays from npf.[ch] to rail.[ch]. * Codechange: move RailType enum from tile.h to rail.h. * Add: Wrapper functions for masking signal status in the map arrays: SignalAlongTrackdir, SignalAgainstTrackdir and SignalOnTrack. * Add: Wrapper functions to access rail tiles, using above enums * Add: Wrapper functions to modify tracks, trackdirs, directions, etc. * Add: Wrapper functions for all lookup arrays in rail.[ch] (Arrays are still used in parts of the code) * Codechange: Renamed some variables and arguments to better represent what they contain (railbit -> track, bits -> trackdirbits, etc.). * Codechange: Don't use FindLandscapeHeight() in CmdRemoveSingleRail(), since it returns way too much info. Use GetTileSlope() instead. * Codechange: [NPF] Removed some unused globals and code from npf.c.pull/155/head
matthijs
19 years ago
parent
65de40f547
commit
1876744744
@ -0,0 +1,93 @@
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#include "rail.h"
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/* Maps a trackdir to the bit that stores its status in the map arrays, in the
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* direction along with the trackdir */
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const byte _signal_along_trackdir[] = {
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0x80, 0x80, 0x80, 0x20, 0x40, 0x10, 0, 0,
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0x40, 0x40, 0x40, 0x10, 0x80, 0x20
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};
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/* Maps a trackdir to the bit that stores its status in the map arrays, in the
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* direction against the trackdir */
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const byte _signal_against_trackdir[] = {
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0x40, 0x40, 0x40, 0x10, 0x80, 0x20, 0, 0,
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0x80, 0x80, 0x80, 0x20, 0x40, 0x10
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};
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/* Maps a Track to the bits that store the status of the two signals that can
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* be present on the given track */
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const byte _signal_on_track[] = {
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0xC0, 0xC0, 0xC0, 0x30, 0xC0, 0x30
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};
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/* Maps a diagonal direction to the all trackdirs that are connected to any
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* track entering in this direction (including those making 90 degree turns)
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*/
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const TrackdirBits _exitdir_reaches_trackdirs[] = {
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TRACKDIR_BIT_DIAG1_NE|TRACKDIR_BIT_LOWER_E|TRACKDIR_BIT_LEFT_N, /* DIAGDIR_NE */
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TRACKDIR_BIT_DIAG2_SE|TRACKDIR_BIT_LEFT_S |TRACKDIR_BIT_UPPER_E, /* DIAGDIR_SE */
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TRACKDIR_BIT_DIAG1_SW|TRACKDIR_BIT_UPPER_W|TRACKDIR_BIT_RIGHT_S, /* DIAGDIR_SW */
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TRACKDIR_BIT_DIAG2_NW|TRACKDIR_BIT_RIGHT_N|TRACKDIR_BIT_LOWER_W /* DIAGDIR_NW */
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};
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/* TODO: Remove magic numbers from tables below just like
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* _exitdir_reaches_trackdirs[] */
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const Trackdir _next_trackdir[14] = {
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0, 1, 3, 2, 5, 4, 0, 0,
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8, 9, 11, 10, 13, 12
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};
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/* Maps a trackdir to all trackdirs that make 90 deg turns with it. */
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const TrackdirBits _trackdir_crosses_trackdirs[] = {
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0x0202, 0x0101, 0x3030, 0x3030, 0x0C0C, 0x0C0C, 0, 0,
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0x0202, 0x0101, 0x3030, 0x3030, 0x0C0C, 0x0C0C
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};
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/* Maps a track to all tracks that make 90 deg turns with it. */
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const TrackBits _track_crosses_tracks[] = {
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0x2, /* Track 1 -> Track 2 */
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0x1, /* Track 2 -> Track 1 */
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0x30, /* Upper -> Left | Right */
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0x30, /* Lower -> Left | Right */
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0x0C, /* Left -> Upper | Lower */
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0x0C, /* Right -> Upper | Lower */
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};
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/* Maps a trackdir to the (4-way) direction the tile is exited when following
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* that trackdir */
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const DiagDirection _trackdir_to_exitdir[] = {
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0,1,0,1,2,1, 0,0,
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2,3,3,2,3,0,
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};
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const Trackdir _track_exitdir_to_trackdir[][DIAGDIR_END] = {
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{0, 0xff, 8, 0xff},
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{0xff, 1, 0xff, 9},
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{2, 0xff, 0xff, 10},
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{0xff, 3, 11, 0xf},
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{0xff, 0xff, 4, 12},
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{13, 5, 0xff, 0xff}
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};
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const Trackdir _track_direction_to_trackdir[][DIR_END] = {
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{0xff, 0, 0xff, 0xff, 0xff, 8, 0xff, 0xff},
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{0xff, 0xff, 0xff, 1, 0xff, 0xff, 0xff, 9},
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{0xff, 0xff, 2, 0xff, 0xff, 0xff, 10, 0xff},
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{0xff, 0xff, 3, 0xff, 0xff, 0xff, 11, 0xff},
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{12, 0xff, 0xff, 0xff, 4, 0xff, 0xff, 0xff},
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{13, 0xff, 0xff, 0xff, 5, 0xff, 0xff, 0xff}
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};
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const Trackdir _dir_to_diag_trackdir[] = {
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0, 1, 8, 9,
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};
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const DiagDirection _reverse_diagdir[] = {
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2, 3, 0, 1
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};
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const Trackdir _reverse_trackdir[] = {
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8, 9, 10, 11, 12, 13, 0xFF, 0xFF,
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0, 1, 2, 3, 4, 5
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};
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#ifndef RAIL_H
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#define RAIL_H
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#include "stdafx.h"
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#include "openttd.h"
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#include "tile.h"
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/*
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* Some enums for accesing the map bytes for rail tiles
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*/
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/* These types are used in the map5 byte for rail tiles. Use GetRailTileType() to
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* get these values */
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typedef enum RailTileTypes {
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RAIL_TYPE_NORMAL = 0x0,
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RAIL_TYPE_SIGNALS = 0x40,
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RAIL_TYPE_UNUSED = 0x80, /* XXX: Maybe this could become waypoints? */
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RAIL_TYPE_DEPOT_WAYPOINT = 0xC0, /* Is really depots and waypoints... */
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RAIL_TILE_TYPE_MASK = 0xC0,
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} RailTileType;
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enum { /* DEPRECATED TODO: Rewrite all uses of this */
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RAIL_TYPE_SPECIAL = 0x80, /* This used to say "If this bit is set, then it's
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* not a regular track.", but currently, you
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* should rather view map5[6..7] as one type,
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* containing a value from RailTileTypes above.
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* This value is only maintained for backwards
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* compatibility */
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/* There used to be RAIL_BIT_* enums here, they moved to (for now) npf.c as
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* TRACK_BIT_* */
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};
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/* These subtypes are used in the map5 byte when the main rail type is
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* RAIL_TYPE_DEPOT_WAYPOINT */
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typedef enum {
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RAIL_SUBTYPE_DEPOT = 0x00,
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RAIL_SUBTYPE_WAYPOINT = 0x04,
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RAIL_SUBTYPE_MASK = 0x3C,
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} RailTileSubtype;
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typedef enum {
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/* Stored in _map3_hi[0..1] for MP_RAILWAY */
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SIGTYPE_NORMAL = 0, // normal signal
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SIGTYPE_ENTRY = 1, // presignal block entry
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SIGTYPE_EXIT = 2, // presignal block exit
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SIGTYPE_COMBO = 3, // presignal inter-block
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SIGTYPE_END,
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SIGTYPE_MASK = 3,
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} SignalType;
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typedef enum {
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RAILTYPE_RAIL = 0,
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RAILTYPE_MONO = 1,
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RAILTYPE_MAGLEV = 2,
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RAILTYPE_END,
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RAILTYPE_MASK = 0x3,
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INVALID_RAILTYPE = 0xFF,
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} RailType;
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enum {
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SIG_SEMAPHORE_MASK = 4,
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};
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/* These are used to specify a single track. Can be translated to a trackbit
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* with TrackToTrackbit */
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typedef enum {
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TRACK_DIAG1 = 0,
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TRACK_DIAG2 = 1,
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TRACK_UPPER = 2,
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TRACK_LOWER = 3,
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TRACK_LEFT = 4,
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TRACK_RIGHT = 5,
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TRACK_END,
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INVALID_TRACK = 0xFF,
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} Track;
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/* These are the bitfield variants of the above */
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typedef enum {
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TRACK_BIT_DIAG1 = 1, // 0
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TRACK_BIT_DIAG2 = 2, // 1
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TRACK_BIT_UPPER = 4, // 2
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TRACK_BIT_LOWER = 8, // 3
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TRACK_BIT_LEFT = 16, // 4
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TRACK_BIT_RIGHT = 32, // 5
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TRACK_BIT_MASK = 0x3F,
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} TrackBits;
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/* These are a combination of tracks and directions. Values are 0-5 in one
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direction (corresponding to the Track enum) and 8-13 in the other direction. */
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typedef enum {
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TRACKDIR_DIAG1_NE = 0,
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TRACKDIR_DIAG2_SE = 1,
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TRACKDIR_UPPER_E = 2,
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TRACKDIR_LOWER_E = 3,
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TRACKDIR_LEFT_S = 4,
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TRACKDIR_RIGHT_S = 5,
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/* Note the two missing values here. This enables trackdir -> track conversion by doing (trackdir & 7) */
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TRACKDIR_DIAG1_SW = 8,
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TRACKDIR_DIAG2_NW = 9,
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TRACKDIR_UPPER_W = 10,
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TRACKDIR_LOWER_W = 11,
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TRACKDIR_LEFT_N = 12,
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TRACKDIR_RIGHT_N = 13,
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TRACKDIR_END,
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INVALID_TRACKDIR = 0xFF,
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} Trackdir;
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/* These are a combination of tracks and directions. Values are 0-5 in one
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direction (corresponding to the Track enum) and 8-13 in the other direction. */
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typedef enum {
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TRACKDIR_BIT_DIAG1_NE = 0x1,
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TRACKDIR_BIT_DIAG2_SE = 0x2,
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TRACKDIR_BIT_UPPER_E = 0x4,
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TRACKDIR_BIT_LOWER_E = 0x8,
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TRACKDIR_BIT_LEFT_S = 0x10,
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TRACKDIR_BIT_RIGHT_S = 0x20,
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/* Again, note the two missing values here. This enables trackdir -> track conversion by doing (trackdir & 0xFF) */
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TRACKDIR_BIT_DIAG1_SW = 0x0100,
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TRACKDIR_BIT_DIAG2_NW = 0x0200,
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TRACKDIR_BIT_UPPER_W = 0x0400,
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TRACKDIR_BIT_LOWER_W = 0x0800,
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TRACKDIR_BIT_LEFT_N = 0x1000,
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TRACKDIR_BIT_RIGHT_N = 0x2000,
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TRACKDIR_BIT_MASK = 0x3F3F,
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INVALID_TRACKDIR_BIT = 0xFFFF,
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} TrackdirBits;
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/* These are states in which a signal can be. Currently these are only two, so
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* simple boolean logic will do. But do try to compare to this enum instead of
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* normal boolean evaluation, since that will make future additions easier.
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*/
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typedef enum {
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SIGNALSTATE_RED = 0,
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SIGNALSTATE_GREEN = 1,
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} SignalState;
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/*
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* These functions check the validity of Tracks and Trackdirs. assert against
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* them when convenient.
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*/
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static inline bool IsValidTrack(Track track) { return track < TRACK_END; }
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static inline bool IsValidTrackdir(Trackdir trackdir) { return trackdir < TRACKDIR_END; }
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/*
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* Functions to map tracks to the corresponding bits in the signal
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* presence/status bytes in the map. You should not use these directly, but
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* wrapper functions below instead. XXX: Which are these?
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*/
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/**
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* Maps a trackdir to the bit that stores its status in the map arrays, in the
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* direction along with the trackdir.
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*/
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const byte _signal_along_trackdir[TRACKDIR_END];
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static inline byte SignalAlongTrackdir(Trackdir trackdir) {return _signal_along_trackdir[trackdir];}
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/**
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* Maps a trackdir to the bit that stores its status in the map arrays, in the
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* direction against the trackdir.
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*/
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const byte _signal_against_trackdir[TRACKDIR_END];
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static inline byte SignalAgainstTrackdir(Trackdir trackdir) { return _signal_against_trackdir[trackdir]; }
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/**
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* Maps a Track to the bits that store the status of the two signals that can
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* be present on the given track.
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*/
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const byte _signal_on_track[TRACK_END];
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static inline byte SignalOnTrack(Track track) { return _signal_on_track[track]; }
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/*
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* Some functions to query rail tiles
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*/
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/**
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* Returns the RailTileType of a given rail tile. (ie normal, with signals,
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* depot, etc.)
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*/
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static inline RailTileType GetRailTileType(TileIndex tile)
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{
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assert(IsTileType(tile, MP_RAILWAY));
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return (_map5[tile] & RAIL_TILE_TYPE_MASK);
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}
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/**
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* Returns the rail type of the given rail tile (ie rail, mono, maglev).
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*/
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static inline RailType GetRailType(TileIndex tile) { return _map3_lo[tile] & RAILTYPE_MASK; }
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/**
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* Checks if a rail tile has signals.
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*/
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static inline bool HasSignals(TileIndex tile)
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{
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return GetRailTileType(tile) == RAIL_TYPE_SIGNALS;
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}
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/**
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* Returns the RailTileSubtype of a given rail tile with type
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* RAIL_TYPE_DEPOT_WAYPOINT
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*/
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static inline RailTileSubtype GetRailTileSubtype(TileIndex tile)
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{
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assert(GetRailTileType(tile) == RAIL_TYPE_DEPOT_WAYPOINT);
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return _map5[tile] & RAIL_SUBTYPE_MASK;
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}
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/**
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* Returns whether this is plain rails, with or without signals. Iow, if this
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* tiles RailTileType is RAIL_TYPE_NORMAL or RAIL_TYPE_SIGNALS.
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*/
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static inline bool IsPlainRailTile(TileIndex tile)
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{
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RailTileType rtt = GetRailTileType(tile);
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return rtt == RAIL_TYPE_NORMAL || rtt == RAIL_TYPE_SIGNALS;
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}
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/**
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* Returns the tracks present on the given plain rail tile (IsPlainRailTile())
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*/
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static inline TrackBits GetTrackBits(TileIndex tile)
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{
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assert(GetRailTileType(tile) == RAIL_TYPE_NORMAL || GetRailTileType(tile) == RAIL_TYPE_SIGNALS);
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return _map5[tile] & TRACK_BIT_MASK;
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}
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/**
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* Returns whether the given track is present on the given tile. Tile must be
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* a plain rail tile (IsPlainRailTile()).
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*/
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static inline bool HasTrack(TileIndex tile, Track track)
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{
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assert(IsValidTrack(track));
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return HASBIT(GetTrackBits(tile), track);
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}
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/*
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* Functions describing logical relations between Tracks, TrackBits, Trackdirs
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* TrackdirBits, Direction and DiagDirections.
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*
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* TODO: Add #unndefs or something similar to remove the arrays used below
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* from the global scope and expose direct uses of them.
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*/
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/**
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* Maps a trackdir to the trackdir that you will end up on if you go straight
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* ahead. This will be the same trackdir for diagonal trackdirs, but a
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* different (alternating) one for straight trackdirs
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*/
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const Trackdir _next_trackdir[TRACKDIR_END];
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static inline Trackdir NextTrackdir(Trackdir trackdir) { return _next_trackdir[trackdir]; }
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/**
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* Maps a track to all tracks that make 90 deg turns with it.
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*/
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const TrackBits _track_crosses_tracks[TRACK_END];
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static inline TrackBits TrackCrossesTracks(Track track) { return _track_crosses_tracks[track]; }
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/**
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* Maps a trackdir to the (4-way) direction the tile is exited when following
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* that trackdir.
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*/
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const DiagDirection _trackdir_to_exitdir[TRACKDIR_END];
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static inline DiagDirection TrackdirToExitdir(Trackdir trackdir) { return _trackdir_to_exitdir[trackdir]; }
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/**
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* Maps a track and an (4-way) dir to the trackdir that represents the track
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* with the exit in the given direction.
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*/
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const Trackdir _track_exitdir_to_trackdir[TRACK_END][DIAGDIR_END];
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static inline Trackdir TrackExitdirToTrackdir(Track track, DiagDirection diagdir) { return _track_exitdir_to_trackdir[track][diagdir]; }
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/**
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* Maps a track and a full (8-way) direction to the trackdir that represents
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* the track running in the given direction.
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*/
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const Trackdir _track_direction_to_trackdir[TRACK_END][DIR_END];
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static inline Trackdir TrackDirectionToTrackdir(Track track, Direction dir) { return _track_direction_to_trackdir[track][dir]; }
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/**
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* Maps a (4-way) direction to the diagonal trackdir that runs in that
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* direction.
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*/
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const Trackdir _dir_to_diag_trackdir[DIAGDIR_END];
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static inline Trackdir DiagdirToDiagTrackdir(DiagDirection diagdir) { return _dir_to_diag_trackdir[diagdir]; }
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/**
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* Maps a trackdir to the trackdirs that can be reached from it (ie, when
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* entering the next tile. This
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*/
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const TrackdirBits _exitdir_reaches_trackdirs[DIAGDIR_END];
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/* Note that there is no direct table for this function (there used to be),
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* but it uses two simpeler tables to achieve the result */
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static inline TrackdirBits TrackdirReachesTrackdirs(Trackdir trackdir) { return _exitdir_reaches_trackdirs[TrackdirToExitdir(trackdir)]; }
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/**
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* Maps a trackdir to all trackdirs that make 90 deg turns with it.
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*/
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const TrackdirBits _trackdir_crosses_trackdirs[TRACKDIR_END];
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static inline TrackdirBits TrackdirCrossesTrackdirs(Trackdir trackdir) { return _trackdir_crosses_trackdirs[trackdir]; }
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/**
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* Maps a (4-way) direction to the reverse.
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*/
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const DiagDirection _reverse_diagdir[DIAGDIR_END];
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static inline DiagDirection ReverseDiagdir(DiagDirection diagdir) { return _reverse_diagdir[diagdir]; }
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/**
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* Maps a trackdir to the reverse trackdir.
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*/
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const Trackdir _reverse_trackdir[TRACKDIR_END];
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static inline Trackdir ReverseTrackdir(Trackdir trackdir) { return _reverse_trackdir[trackdir]; }
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/**
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* Maps a Trackdir to the corresponding TrackdirBits value
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*/
|
||||
static inline TrackdirBits TrackdirToTrackdirBits(Trackdir trackdir) { return 1 << trackdir; }
|
||||
|
||||
/*
|
||||
* Maps a Track to the corresponding TrackBits value
|
||||
*/
|
||||
static inline TrackBits TrackToTrackBits(Track track) { return 1 << track; }
|
||||
|
||||
/* Returns the Track that a given Trackdir represents */
|
||||
static inline Track TrackdirToTrack(Trackdir trackdir) { return trackdir & 0x7; }
|
||||
|
||||
/* Returns a Trackdir for the given Track. Since every Track corresponds to
|
||||
* two Trackdirs, we choose the one which points between N and SE.
|
||||
* Note that the actual implementation is quite futile, but this might change
|
||||
* in the future.
|
||||
*/
|
||||
static inline Trackdir TrackToTrackdir(Track track) { return track; }
|
||||
|
||||
/* Checks if a given Track is diagonal */
|
||||
static inline bool IsDiagonalTrack(Track track) { return track == TRACK_DIAG1 || track == TRACK_DIAG2; }
|
||||
|
||||
/* Checks if a given Trackdir is diagonal. */
|
||||
static inline bool IsDiagonalTrackdir(Trackdir trackdir) { return IsDiagonalTrack(TrackdirToTrack(trackdir)); }
|
||||
|
||||
/*
|
||||
* Functions quering signals on tiles.
|
||||
*/
|
||||
|
||||
/**
|
||||
* Checks for the presence of signals on the given track on the given tile
|
||||
*/
|
||||
static inline bool HasSignalOnTrack(TileIndex tile, Track track)
|
||||
{
|
||||
assert(IsValidTrack(track));
|
||||
return (GetRailTileType(tile) == RAIL_TYPE_SIGNALS && (_map3_lo[tile] & SignalOnTrack(track)));
|
||||
}
|
||||
|
||||
/**
|
||||
* Gets the state of the signal along the given trackdir.
|
||||
*
|
||||
* Along meaning if you are currently driving on the given trackdir, this is
|
||||
* the signal that is facing us (for which we stop when it's red).
|
||||
*/
|
||||
static inline SignalState GetSignalState(TileIndex tile, Trackdir trackdir)
|
||||
{
|
||||
assert(IsValidTrackdir(trackdir));
|
||||
assert(HasSignalOnTrack(tile, TrackdirToTrack(trackdir)));
|
||||
return ((_map2[tile] & SignalAlongTrackdir(trackdir))?SIGNALSTATE_GREEN:SIGNALSTATE_RED);
|
||||
}
|
||||
|
||||
/**
|
||||
* Gets the type of signal on a given track on a given rail tile with signals.
|
||||
*
|
||||
* Note that currently, the track argument is not used, since
|
||||
* signal types cannot be mixed. This function is trying to be
|
||||
* future-compatible, though.
|
||||
*/
|
||||
static inline SignalType GetSignalType(TileIndex tile, Track track)
|
||||
{
|
||||
assert(IsValidTrack(track));
|
||||
assert(GetRailTileType(tile) == RAIL_TYPE_SIGNALS);
|
||||
return _map3_hi[tile] & SIGTYPE_MASK;
|
||||
}
|
||||
|
||||
/**
|
||||
* Checks if this tile contains semaphores (returns true) or normal signals
|
||||
* (returns false) on the given track. Does not check if there are actually
|
||||
* signals on the track, you should use HasSignalsOnTrack() for that.
|
||||
*
|
||||
* Note that currently, the track argument is not used, since
|
||||
* semaphores/electric signals cannot be mixed. This function is trying to be
|
||||
* future-compatible, though.
|
||||
*/
|
||||
static inline bool HasSemaphores(TileIndex tile, Track track)
|
||||
{
|
||||
assert(IsValidTrack(track));
|
||||
return _map3_hi[tile] & SIG_SEMAPHORE_MASK;
|
||||
}
|
||||
|
||||
#endif // RAIL_H
|
||||
File diff suppressed because it is too large
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Reference in New Issue