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-rw-r--r--src/rail.cpp132
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diff --git a/src/rail.cpp b/src/rail.cpp
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+++ b/src/rail.cpp
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+/* $Id$ */
+
+#include "stdafx.h"
+#include "openttd.h"
+#include "bridge_map.h"
+#include "rail.h"
+#include "station_map.h"
+#include "tunnel_map.h"
+
+/* XXX: Below 3 tables store duplicate data. Maybe remove some? */
+/* Maps a trackdir to the bit that stores its status in the map arrays, in the
+ * direction along with the trackdir */
+const byte _signal_along_trackdir[] = {
+ 0x80, 0x80, 0x80, 0x20, 0x40, 0x10, 0, 0,
+ 0x40, 0x40, 0x40, 0x10, 0x80, 0x20
+};
+
+/* Maps a trackdir to the bit that stores its status in the map arrays, in the
+ * direction against the trackdir */
+const byte _signal_against_trackdir[] = {
+ 0x40, 0x40, 0x40, 0x10, 0x80, 0x20, 0, 0,
+ 0x80, 0x80, 0x80, 0x20, 0x40, 0x10
+};
+
+/* Maps a Track to the bits that store the status of the two signals that can
+ * be present on the given track */
+const byte _signal_on_track[] = {
+ 0xC0, 0xC0, 0xC0, 0x30, 0xC0, 0x30
+};
+
+/* Maps a diagonal direction to the all trackdirs that are connected to any
+ * track entering in this direction (including those making 90 degree turns)
+ */
+const TrackdirBits _exitdir_reaches_trackdirs[] = {
+ TRACKDIR_BIT_X_NE | TRACKDIR_BIT_LOWER_E | TRACKDIR_BIT_LEFT_N, /* DIAGDIR_NE */
+ TRACKDIR_BIT_Y_SE | TRACKDIR_BIT_LEFT_S | TRACKDIR_BIT_UPPER_E, /* DIAGDIR_SE */
+ TRACKDIR_BIT_X_SW | TRACKDIR_BIT_UPPER_W | TRACKDIR_BIT_RIGHT_S, /* DIAGDIR_SW */
+ TRACKDIR_BIT_Y_NW | TRACKDIR_BIT_RIGHT_N | TRACKDIR_BIT_LOWER_W /* DIAGDIR_NW */
+};
+
+const Trackdir _next_trackdir[] = {
+ TRACKDIR_X_NE, TRACKDIR_Y_SE, TRACKDIR_LOWER_E, TRACKDIR_UPPER_E, TRACKDIR_RIGHT_S, TRACKDIR_LEFT_S, INVALID_TRACKDIR, INVALID_TRACKDIR,
+ TRACKDIR_X_SW, TRACKDIR_Y_NW, TRACKDIR_LOWER_W, TRACKDIR_UPPER_W, TRACKDIR_RIGHT_N, TRACKDIR_LEFT_N
+};
+
+/* Maps a trackdir to all trackdirs that make 90 deg turns with it. */
+const TrackdirBits _track_crosses_trackdirs[] = {
+ TRACKDIR_BIT_Y_SE | TRACKDIR_BIT_Y_NW, /* TRACK_X */
+ TRACKDIR_BIT_X_NE | TRACKDIR_BIT_X_SW, /* TRACK_Y */
+ TRACKDIR_BIT_RIGHT_N | TRACKDIR_BIT_RIGHT_S | TRACKDIR_BIT_LEFT_N | TRACKDIR_BIT_LEFT_S, /* TRACK_UPPER */
+ TRACKDIR_BIT_RIGHT_N | TRACKDIR_BIT_RIGHT_S | TRACKDIR_BIT_LEFT_N | TRACKDIR_BIT_LEFT_S, /* TRACK_LOWER */
+ TRACKDIR_BIT_UPPER_W | TRACKDIR_BIT_UPPER_E | TRACKDIR_BIT_LOWER_W | TRACKDIR_BIT_LOWER_E, /* TRACK_LEFT */
+ TRACKDIR_BIT_UPPER_W | TRACKDIR_BIT_UPPER_E | TRACKDIR_BIT_LOWER_W | TRACKDIR_BIT_LOWER_E /* TRACK_RIGHT */
+};
+
+/* Maps a track to all tracks that make 90 deg turns with it. */
+const TrackBits _track_crosses_tracks[] = {
+ TRACK_BIT_Y, /* TRACK_X */
+ TRACK_BIT_X, /* TRACK_Y */
+ TRACK_BIT_VERT, /* TRACK_UPPER */
+ TRACK_BIT_VERT, /* TRACK_LOWER */
+ TRACK_BIT_HORZ, /* TRACK_LEFT */
+ TRACK_BIT_HORZ /* TRACK_RIGHT */
+};
+
+/* Maps a trackdir to the (4-way) direction the tile is exited when following
+ * that trackdir */
+const DiagDirection _trackdir_to_exitdir[] = {
+ DIAGDIR_NE,DIAGDIR_SE,DIAGDIR_NE,DIAGDIR_SE,DIAGDIR_SW,DIAGDIR_SE, DIAGDIR_NE,DIAGDIR_NE,
+ DIAGDIR_SW,DIAGDIR_NW,DIAGDIR_NW,DIAGDIR_SW,DIAGDIR_NW,DIAGDIR_NE,
+};
+
+const Trackdir _track_exitdir_to_trackdir[][DIAGDIR_END] = {
+ {TRACKDIR_X_NE, INVALID_TRACKDIR, TRACKDIR_X_SW, INVALID_TRACKDIR},
+ {INVALID_TRACKDIR, TRACKDIR_Y_SE, INVALID_TRACKDIR, TRACKDIR_Y_NW},
+ {TRACKDIR_UPPER_E, INVALID_TRACKDIR, INVALID_TRACKDIR, TRACKDIR_UPPER_W},
+ {INVALID_TRACKDIR, TRACKDIR_LOWER_E, TRACKDIR_LOWER_W, INVALID_TRACKDIR},
+ {INVALID_TRACKDIR, INVALID_TRACKDIR, TRACKDIR_LEFT_S, TRACKDIR_LEFT_N},
+ {TRACKDIR_RIGHT_N, TRACKDIR_RIGHT_S, INVALID_TRACKDIR, INVALID_TRACKDIR}
+};
+
+const Trackdir _track_enterdir_to_trackdir[][DIAGDIR_END] = { // TODO: replace magic with enums
+ {TRACKDIR_X_NE, INVALID_TRACKDIR, TRACKDIR_X_SW, INVALID_TRACKDIR},
+ {INVALID_TRACKDIR, TRACKDIR_Y_SE, INVALID_TRACKDIR, TRACKDIR_Y_NW},
+ {INVALID_TRACKDIR, TRACKDIR_UPPER_E, TRACKDIR_UPPER_W, INVALID_TRACKDIR},
+ {TRACKDIR_LOWER_E, INVALID_TRACKDIR, INVALID_TRACKDIR, TRACKDIR_LOWER_W},
+ {TRACKDIR_LEFT_N, TRACKDIR_LEFT_S, INVALID_TRACKDIR, INVALID_TRACKDIR},
+ {INVALID_TRACKDIR, INVALID_TRACKDIR, TRACKDIR_RIGHT_S, TRACKDIR_RIGHT_N}
+};
+
+const Trackdir _track_direction_to_trackdir[][DIR_END] = {
+ {INVALID_TRACKDIR, TRACKDIR_X_NE, INVALID_TRACKDIR, INVALID_TRACKDIR, INVALID_TRACKDIR, TRACKDIR_X_SW, INVALID_TRACKDIR, INVALID_TRACKDIR},
+ {INVALID_TRACKDIR, INVALID_TRACKDIR, INVALID_TRACKDIR, TRACKDIR_Y_SE, INVALID_TRACKDIR, INVALID_TRACKDIR, INVALID_TRACKDIR, TRACKDIR_Y_NW},
+ {INVALID_TRACKDIR, INVALID_TRACKDIR, TRACKDIR_UPPER_E, INVALID_TRACKDIR, INVALID_TRACKDIR, INVALID_TRACKDIR, TRACKDIR_UPPER_W, INVALID_TRACKDIR},
+ {INVALID_TRACKDIR, INVALID_TRACKDIR, TRACKDIR_LOWER_E, INVALID_TRACKDIR, INVALID_TRACKDIR, INVALID_TRACKDIR, TRACKDIR_LOWER_W, INVALID_TRACKDIR},
+ {TRACKDIR_LEFT_N, INVALID_TRACKDIR, INVALID_TRACKDIR, INVALID_TRACKDIR, TRACKDIR_LEFT_S, INVALID_TRACKDIR, INVALID_TRACKDIR, INVALID_TRACKDIR},
+ {TRACKDIR_RIGHT_N, INVALID_TRACKDIR, INVALID_TRACKDIR, INVALID_TRACKDIR, TRACKDIR_RIGHT_S, INVALID_TRACKDIR, INVALID_TRACKDIR, INVALID_TRACKDIR}
+};
+
+const Trackdir _dir_to_diag_trackdir[] = {
+ TRACKDIR_X_NE, TRACKDIR_Y_SE, TRACKDIR_X_SW, TRACKDIR_Y_NW,
+};
+
+
+RailType GetTileRailType(TileIndex tile, Trackdir trackdir)
+{
+ switch (GetTileType(tile)) {
+ case MP_RAILWAY:
+ return GetRailType(tile);
+
+ case MP_STREET:
+ /* rail/road crossing */
+ if (IsLevelCrossing(tile)) return GetRailTypeCrossing(tile);
+ break;
+
+ case MP_STATION:
+ if (IsRailwayStationTile(tile)) return GetRailType(tile);
+ break;
+
+ case MP_TUNNELBRIDGE:
+ if (IsTunnel(tile)) {
+ if (GetTunnelTransportType(tile) == TRANSPORT_RAIL) return GetRailType(tile);
+ } else {
+ if (GetBridgeTransportType(tile) == TRANSPORT_RAIL) return GetRailType(tile);
+ }
+ break;
+
+ default:
+ break;
+ }
+ return INVALID_RAILTYPE;
+}