OpenTTD: src/rail.cpp Source File

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rail.cpp
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1 /* $Id: rail.cpp 26482 2014-04-23 20:13:33Z rubidium $ */
2
3 /*
4 * This file is part of OpenTTD.
5 * 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.
6 * 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.
7 * 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/>.
8 */
9
12 #include "stdafx.h"
13 #include "station_map.h"
14 #include "tunnelbridge_map.h"
15 #include "date_func.h"
16 #include "company_func.h"
17 #include "company_base.h"
18 #include "engine_base.h"
19
20 #include "safeguards.h"
21
22 /* XXX: Below 3 tables store duplicate data. Maybe remove some? */
23 /* Maps a trackdir to the bit that stores its status in the map arrays, in the
24 * direction along with the trackdir */
25 extern const byte _signal_along_trackdir[TRACKDIR_END] = {
26 0x8, 0x8, 0x8, 0x2, 0x4, 0x1, 0, 0,
27 0x4, 0x4, 0x4, 0x1, 0x8, 0x2
28 };
29
30 /* Maps a trackdir to the bit that stores its status in the map arrays, in the
31 * direction against the trackdir */
32 extern const byte _signal_against_trackdir[TRACKDIR_END] = {
33 0x4, 0x4, 0x4, 0x1, 0x8, 0x2, 0, 0,
34 0x8, 0x8, 0x8, 0x2, 0x4, 0x1
35 };
36
37 /* Maps a Track to the bits that store the status of the two signals that can
38 * be present on the given track */
39 extern const byte _signal_on_track[] = {
40 0xC, 0xC, 0xC, 0x3, 0xC, 0x3
41 };
42
43 /* Maps a diagonal direction to the all trackdirs that are connected to any
44 * track entering in this direction (including those making 90 degree turns)
45 */
46 extern const TrackdirBits _exitdir_reaches_trackdirs[] = {
47 TRACKDIR_BIT_X_NE | TRACKDIR_BIT_LOWER_E | TRACKDIR_BIT_LEFT_N, // DIAGDIR_NE
48 TRACKDIR_BIT_Y_SE | TRACKDIR_BIT_LEFT_S | TRACKDIR_BIT_UPPER_E, // DIAGDIR_SE
49 TRACKDIR_BIT_X_SW | TRACKDIR_BIT_UPPER_W | TRACKDIR_BIT_RIGHT_S, // DIAGDIR_SW
50 TRACKDIR_BIT_Y_NW | TRACKDIR_BIT_RIGHT_N | TRACKDIR_BIT_LOWER_W // DIAGDIR_NW
51 };
52
53 extern const Trackdir _next_trackdir[TRACKDIR_END] = {
54 TRACKDIR_X_NE, TRACKDIR_Y_SE, TRACKDIR_LOWER_E, TRACKDIR_UPPER_E, TRACKDIR_RIGHT_S, TRACKDIR_LEFT_S, INVALID_TRACKDIR, INVALID_TRACKDIR,
55 TRACKDIR_X_SW, TRACKDIR_Y_NW, TRACKDIR_LOWER_W, TRACKDIR_UPPER_W, TRACKDIR_RIGHT_N, TRACKDIR_LEFT_N
56 };
57
58 /* Maps a trackdir to all trackdirs that make 90 deg turns with it. */
59 extern const TrackdirBits _track_crosses_trackdirs[TRACKDIR_END] = {
60 TRACKDIR_BIT_Y_SE | TRACKDIR_BIT_Y_NW, // TRACK_X
61 TRACKDIR_BIT_X_NE | TRACKDIR_BIT_X_SW, // TRACK_Y
62 TRACKDIR_BIT_RIGHT_N | TRACKDIR_BIT_RIGHT_S | TRACKDIR_BIT_LEFT_N | TRACKDIR_BIT_LEFT_S, // TRACK_UPPER
63 TRACKDIR_BIT_RIGHT_N | TRACKDIR_BIT_RIGHT_S | TRACKDIR_BIT_LEFT_N | TRACKDIR_BIT_LEFT_S, // TRACK_LOWER
64 TRACKDIR_BIT_UPPER_W | TRACKDIR_BIT_UPPER_E | TRACKDIR_BIT_LOWER_W | TRACKDIR_BIT_LOWER_E, // TRACK_LEFT
65 TRACKDIR_BIT_UPPER_W | TRACKDIR_BIT_UPPER_E | TRACKDIR_BIT_LOWER_W | TRACKDIR_BIT_LOWER_E // TRACK_RIGHT
66 };
67
68 /* Maps a track to all tracks that make 90 deg turns with it. */
69 extern const TrackBits _track_crosses_tracks[] = {
70 TRACK_BIT_Y, // TRACK_X
71 TRACK_BIT_X, // TRACK_Y
72 TRACK_BIT_VERT, // TRACK_UPPER
73 TRACK_BIT_VERT, // TRACK_LOWER
74 TRACK_BIT_HORZ, // TRACK_LEFT
75 TRACK_BIT_HORZ // TRACK_RIGHT
76 };
77
78 /* Maps a trackdir to the (4-way) direction the tile is exited when following
79 * that trackdir */
80 extern const DiagDirection _trackdir_to_exitdir[TRACKDIR_END] = {
81 DIAGDIR_NE, DIAGDIR_SE, DIAGDIR_NE, DIAGDIR_SE, DIAGDIR_SW, DIAGDIR_SE, DIAGDIR_NE, DIAGDIR_NE,
82 DIAGDIR_SW, DIAGDIR_NW, DIAGDIR_NW, DIAGDIR_SW, DIAGDIR_NW, DIAGDIR_NE,
83 };
84
85 extern const Trackdir _track_exitdir_to_trackdir[][DIAGDIR_END] = {
86 {TRACKDIR_X_NE, INVALID_TRACKDIR, TRACKDIR_X_SW, INVALID_TRACKDIR},
87 {INVALID_TRACKDIR, TRACKDIR_Y_SE, INVALID_TRACKDIR, TRACKDIR_Y_NW},
88 {TRACKDIR_UPPER_E, INVALID_TRACKDIR, INVALID_TRACKDIR, TRACKDIR_UPPER_W},
89 {INVALID_TRACKDIR, TRACKDIR_LOWER_E, TRACKDIR_LOWER_W, INVALID_TRACKDIR},
90 {INVALID_TRACKDIR, INVALID_TRACKDIR, TRACKDIR_LEFT_S, TRACKDIR_LEFT_N},
91 {TRACKDIR_RIGHT_N, TRACKDIR_RIGHT_S, INVALID_TRACKDIR, INVALID_TRACKDIR}
92 };
93
94 extern const Trackdir _track_enterdir_to_trackdir[][DIAGDIR_END] = {
95 {TRACKDIR_X_NE, INVALID_TRACKDIR, TRACKDIR_X_SW, INVALID_TRACKDIR},
96 {INVALID_TRACKDIR, TRACKDIR_Y_SE, INVALID_TRACKDIR, TRACKDIR_Y_NW},
97 {INVALID_TRACKDIR, TRACKDIR_UPPER_E, TRACKDIR_UPPER_W, INVALID_TRACKDIR},
98 {TRACKDIR_LOWER_E, INVALID_TRACKDIR, INVALID_TRACKDIR, TRACKDIR_LOWER_W},
99 {TRACKDIR_LEFT_N, TRACKDIR_LEFT_S, INVALID_TRACKDIR, INVALID_TRACKDIR},
100 {INVALID_TRACKDIR, INVALID_TRACKDIR, TRACKDIR_RIGHT_S, TRACKDIR_RIGHT_N}
101 };
102
103 extern const Trackdir _track_direction_to_trackdir[][DIR_END] = {
104 {INVALID_TRACKDIR, TRACKDIR_X_NE, INVALID_TRACKDIR, INVALID_TRACKDIR, INVALID_TRACKDIR, TRACKDIR_X_SW, INVALID_TRACKDIR, INVALID_TRACKDIR},
105 {INVALID_TRACKDIR, INVALID_TRACKDIR, INVALID_TRACKDIR, TRACKDIR_Y_SE, INVALID_TRACKDIR, INVALID_TRACKDIR, INVALID_TRACKDIR, TRACKDIR_Y_NW},
106 {INVALID_TRACKDIR, INVALID_TRACKDIR, TRACKDIR_UPPER_E, INVALID_TRACKDIR, INVALID_TRACKDIR, INVALID_TRACKDIR, TRACKDIR_UPPER_W, INVALID_TRACKDIR},
107 {INVALID_TRACKDIR, INVALID_TRACKDIR, TRACKDIR_LOWER_E, INVALID_TRACKDIR, INVALID_TRACKDIR, INVALID_TRACKDIR, TRACKDIR_LOWER_W, INVALID_TRACKDIR},
108 {TRACKDIR_LEFT_N, INVALID_TRACKDIR, INVALID_TRACKDIR, INVALID_TRACKDIR, TRACKDIR_LEFT_S, INVALID_TRACKDIR, INVALID_TRACKDIR, INVALID_TRACKDIR},
109 {TRACKDIR_RIGHT_N, INVALID_TRACKDIR, INVALID_TRACKDIR, INVALID_TRACKDIR, TRACKDIR_RIGHT_S, INVALID_TRACKDIR, INVALID_TRACKDIR, INVALID_TRACKDIR}
110 };
111
112 extern const Trackdir _dir_to_diag_trackdir[] = {
113 TRACKDIR_X_NE, TRACKDIR_Y_SE, TRACKDIR_X_SW, TRACKDIR_Y_NW,
114 };
115
116 extern const TrackBits _corner_to_trackbits[] = {
117 TRACK_BIT_LEFT, TRACK_BIT_LOWER, TRACK_BIT_RIGHT, TRACK_BIT_UPPER,
118 };
119
120 extern const TrackdirBits _uphill_trackdirs[] = {
121 TRACKDIR_BIT_NONE ,
122 TRACKDIR_BIT_X_SW | TRACKDIR_BIT_Y_NW,
123 TRACKDIR_BIT_X_SW | TRACKDIR_BIT_Y_SE,
124 TRACKDIR_BIT_X_SW ,
125 TRACKDIR_BIT_X_NE | TRACKDIR_BIT_Y_SE,
126 TRACKDIR_BIT_NONE ,
127 TRACKDIR_BIT_Y_SE ,
128 TRACKDIR_BIT_NONE ,
129 TRACKDIR_BIT_X_NE | TRACKDIR_BIT_Y_NW,
130 TRACKDIR_BIT_Y_NW ,
131 TRACKDIR_BIT_NONE ,
132 TRACKDIR_BIT_NONE ,
133 TRACKDIR_BIT_X_NE ,
134 TRACKDIR_BIT_NONE ,
135 TRACKDIR_BIT_NONE ,
136 TRACKDIR_BIT_NONE ,
137 TRACKDIR_BIT_NONE ,
138 TRACKDIR_BIT_NONE ,
139 TRACKDIR_BIT_NONE ,
140 TRACKDIR_BIT_NONE ,
141 TRACKDIR_BIT_NONE ,
142 TRACKDIR_BIT_NONE ,
143 TRACKDIR_BIT_NONE ,
144 TRACKDIR_BIT_X_SW | TRACKDIR_BIT_Y_SE,
145 TRACKDIR_BIT_NONE ,
146 TRACKDIR_BIT_NONE ,
147 TRACKDIR_BIT_NONE ,
148 TRACKDIR_BIT_X_SW | TRACKDIR_BIT_Y_NW,
149 TRACKDIR_BIT_NONE ,
150 TRACKDIR_BIT_X_NE | TRACKDIR_BIT_Y_NW,
151 TRACKDIR_BIT_X_NE | TRACKDIR_BIT_Y_SE,
152 };
153
157 RailType GetTileRailType(TileIndex tile)
158 {
159 switch (GetTileType(tile)) {
160 case MP_RAILWAY:
161 return GetRailType(tile);
162
163 case MP_ROAD:
164 /* rail/road crossing */
165 if (IsLevelCrossing(tile)) return GetRailType(tile);
166 break;
167
168 case MP_STATION:
169 if (HasStationRail(tile)) return GetRailType(tile);
170 break;
171
172 case MP_TUNNELBRIDGE:
173 if (GetTunnelBridgeTransportType(tile) == TRANSPORT_RAIL) return GetRailType(tile);
174 break;
175
176 default:
177 break;
178 }
179 return INVALID_RAILTYPE;
180 }
181
188 bool HasRailtypeAvail(const CompanyID company, const RailType railtype)
189 {
190 return HasBit(Company::Get(company)->avail_railtypes, railtype);
191 }
192
198 bool ValParamRailtype(const RailType rail)
199 {
200 return rail < RAILTYPE_END && HasRailtypeAvail(_current_company, rail);
201 }
202
210 RailType GetBestRailtype(const CompanyID company)
211 {
212 if (HasRailtypeAvail(company, RAILTYPE_MAGLEV)) return RAILTYPE_MAGLEV;
213 if (HasRailtypeAvail(company, RAILTYPE_MONO)) return RAILTYPE_MONO;
214 if (HasRailtypeAvail(company, RAILTYPE_ELECTRIC)) return RAILTYPE_ELECTRIC;
215 return RAILTYPE_RAIL;
216 }
217
225 RailTypes AddDateIntroducedRailTypes(RailTypes current, Date date)
226 {
227 RailTypes rts = current;
228
229 for (RailType rt = RAILTYPE_BEGIN; rt != RAILTYPE_END; rt++) {
230 const RailtypeInfo *rti = GetRailTypeInfo(rt);
231 /* Unused rail type. */
232 if (rti->label == 0) continue;
233
234 /* Not date introduced. */
235 if (!IsInsideMM(rti->introduction_date, 0, MAX_DAY)) continue;
236
237 /* Not yet introduced at this date. */
238 if (rti->introduction_date > date) continue;
239
240 /* Have we introduced all required railtypes? */
241 RailTypes required = rti->introduction_required_railtypes;
242 if ((rts & required) != required) continue;
243
244 rts |= rti->introduces_railtypes;
245 }
246
247 /* When we added railtypes we need to run this method again; the added
248 * railtypes might enable more rail types to become introduced. */
249 return rts == current ? rts : AddDateIntroducedRailTypes(rts, date);
250 }
251
257 RailTypes GetCompanyRailtypes(CompanyID company)
258 {
259 RailTypes rts = RAILTYPES_NONE;
260
261 Engine *e;
262 FOR_ALL_ENGINES_OF_TYPE(e, VEH_TRAIN) {
263 const EngineInfo *ei = &e->info;
264
265 if (HasBit(ei->climates, _settings_game.game_creation.landscape) &&
266 (HasBit(e->company_avail, company) || _date >= e->intro_date + DAYS_IN_YEAR)) {
267 const RailVehicleInfo *rvi = &e->u.rail;
268
269 if (rvi->railveh_type != RAILVEH_WAGON) {
270 assert(rvi->railtype < RAILTYPE_END);
271 rts |= GetRailTypeInfo(rvi->railtype)->introduces_railtypes;
272 }
273 }
274 }
275
276 return AddDateIntroducedRailTypes(rts, _date);
277 }
278
285 RailType GetRailTypeByLabel(RailTypeLabel label, bool allow_alternate_labels)
286 {
287 /* Loop through each rail type until the label is found */
288 for (RailType r = RAILTYPE_BEGIN; r != RAILTYPE_END; r++) {
289 const RailtypeInfo *rti = GetRailTypeInfo(r);
290 if (rti->label == label) return r;
291 }
292
293 if (allow_alternate_labels) {
294 /* Test if any rail type defines the label as an alternate. */
295 for (RailType r = RAILTYPE_BEGIN; r != RAILTYPE_END; r++) {
296 const RailtypeInfo *rti = GetRailTypeInfo(r);
297 if (rti->alternate_labels.Contains(label)) return r;
298 }
299 }
300
301 /* No matching label was found, so it is invalid */
302 return INVALID_RAILTYPE;
303 }