summaryrefslogtreecommitdiff
path: root/src/newgrf_engine.cpp
blob: 40d931d70d4577d0fbcc66da3a91171d06b51232 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214
1215
1216
1217
1218
1219
1220
1221
1222
1223
1224
1225
1226
1227
1228
1229
1230
1231
1232
1233
1234
1235
1236
1237
1238
1239
1240
1241
1242
1243
1244
1245
1246
1247
1248
1249
1250
1251
1252
1253
1254
1255
1256
1257
1258
1259
1260
1261
1262
1263
1264
1265
1266
1267
1268
1269
1270
1271
1272
1273
1274
1275
1276
1277
1278
1279
1280
1281
1282
1283
1284
1285
1286
1287
1288
1289
1290
1291
1292
/* $Id$ */

/*
 * This file is part of OpenTTD.
 * 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.
 * 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.
 * 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/>.
 */

/** @file newgrf_engine.cpp NewGRF handling of engines. */

#include "stdafx.h"
#include "debug.h"
#include "train.h"
#include "roadveh.h"
#include "company_func.h"
#include "newgrf.h"
#include "newgrf_cargo.h"
#include "newgrf_spritegroup.h"
#include "date_func.h"
#include "vehicle_func.h"
#include "core/random_func.hpp"
#include "aircraft.h"
#include "station_base.h"
#include "company_base.h"
#include "newgrf_railtype.h"

struct WagonOverride {
	EngineID *train_id;
	uint trains;
	CargoID cargo;
	const SpriteGroup *group;
};

void SetWagonOverrideSprites(EngineID engine, CargoID cargo, const SpriteGroup *group, EngineID *train_id, uint trains)
{
	Engine *e = Engine::Get(engine);
	WagonOverride *wo;

	assert(cargo < NUM_CARGO + 2); // Include CT_DEFAULT and CT_PURCHASE pseudo cargos.

	e->overrides_count++;
	e->overrides = ReallocT(e->overrides, e->overrides_count);

	wo = &e->overrides[e->overrides_count - 1];
	wo->group = group;
	wo->cargo = cargo;
	wo->trains = trains;
	wo->train_id = MallocT<EngineID>(trains);
	memcpy(wo->train_id, train_id, trains * sizeof *train_id);
}

const SpriteGroup *GetWagonOverrideSpriteSet(EngineID engine, CargoID cargo, EngineID overriding_engine)
{
	const Engine *e = Engine::Get(engine);

	/* XXX: This could turn out to be a timesink on profiles. We could
	 * always just dedicate 65535 bytes for an [engine][train] trampoline
	 * for O(1). Or O(logMlogN) and searching binary tree or smt. like
	 * that. --pasky */

	for (uint i = 0; i < e->overrides_count; i++) {
		const WagonOverride *wo = &e->overrides[i];

		if (wo->cargo != cargo && wo->cargo != CT_DEFAULT) continue;

		for (uint j = 0; j < wo->trains; j++) {
			if (wo->train_id[j] == overriding_engine) return wo->group;
		}
	}
	return NULL;
}

/**
 * Unload all wagon override sprite groups.
 */
void UnloadWagonOverrides(Engine *e)
{
	for (uint i = 0; i < e->overrides_count; i++) {
		WagonOverride *wo = &e->overrides[i];
		free(wo->train_id);
	}
	free(e->overrides);
	e->overrides_count = 0;
	e->overrides = NULL;
}


void SetCustomEngineSprites(EngineID engine, byte cargo, const SpriteGroup *group)
{
	Engine *e = Engine::Get(engine);
	assert(cargo < lengthof(e->grf_prop.spritegroup));

	if (e->grf_prop.spritegroup[cargo] != NULL) {
		grfmsg(6, "SetCustomEngineSprites: engine %d cargo %d already has group -- replacing", engine, cargo);
	}
	e->grf_prop.spritegroup[cargo] = group;
}


/**
 * Tie a GRFFile entry to an engine, to allow us to retrieve GRF parameters
 * etc during a game.
 * @param engine Engine ID to tie the GRFFile to.
 * @param file   Pointer of GRFFile to tie.
 */
void SetEngineGRF(EngineID engine, const GRFFile *file)
{
	Engine *e = Engine::Get(engine);
	e->grf_prop.grffile = file;
}


static int MapOldSubType(const Vehicle *v)
{
	switch (v->type) {
		case VEH_TRAIN:
			if (Train::From(v)->IsEngine()) return 0;
			if (Train::From(v)->IsFreeWagon()) return 4;
			return 2;
		case VEH_ROAD:
		case VEH_SHIP:     return 0;
		case VEH_AIRCRAFT:
		case VEH_DISASTER: return v->subtype;
		case VEH_EFFECT:   return v->subtype << 1;
		default: NOT_REACHED();
	}
}


/* TTDP style aircraft movement states for GRF Action 2 Var 0xE2 */
enum TTDPAircraftMovementStates {
	AMS_TTDP_HANGAR,
	AMS_TTDP_TO_HANGAR,
	AMS_TTDP_TO_PAD1,
	AMS_TTDP_TO_PAD2,
	AMS_TTDP_TO_PAD3,
	AMS_TTDP_TO_ENTRY_2_AND_3,
	AMS_TTDP_TO_ENTRY_2_AND_3_AND_H,
	AMS_TTDP_TO_JUNCTION,
	AMS_TTDP_LEAVE_RUNWAY,
	AMS_TTDP_TO_INWAY,
	AMS_TTDP_TO_RUNWAY,
	AMS_TTDP_TO_OUTWAY,
	AMS_TTDP_WAITING,
	AMS_TTDP_TAKEOFF,
	AMS_TTDP_TO_TAKEOFF,
	AMS_TTDP_CLIMBING,
	AMS_TTDP_FLIGHT_APPROACH,
	AMS_TTDP_UNUSED_0x11,
	AMS_TTDP_FLIGHT_TO_TOWER,
	AMS_TTDP_UNUSED_0x13,
	AMS_TTDP_FLIGHT_FINAL,
	AMS_TTDP_FLIGHT_DESCENT,
	AMS_TTDP_BRAKING,
	AMS_TTDP_HELI_TAKEOFF_AIRPORT,
	AMS_TTDP_HELI_TO_TAKEOFF_AIRPORT,
	AMS_TTDP_HELI_LAND_AIRPORT,
	AMS_TTDP_HELI_TAKEOFF_HELIPORT,
	AMS_TTDP_HELI_TO_TAKEOFF_HELIPORT,
	AMS_TTDP_HELI_LAND_HELIPORT,
};


/**
 * Map OTTD aircraft movement states to TTDPatch style movement states
 * (VarAction 2 Variable 0xE2)
 */
static byte MapAircraftMovementState(const Aircraft *v)
{
	const Station *st = GetTargetAirportIfValid(v);
	if (st == NULL) return AMS_TTDP_FLIGHT_TO_TOWER;

	const AirportFTAClass *afc = st->airport.GetFTA();
	uint16 amdflag = afc->MovingData(v->pos)->flag;

	switch (v->state) {
		case HANGAR:
			/* The international airport is a special case as helicopters can land in
			 * front of the hanger. Helicopters also change their air.state to
			 * AMED_HELI_LOWER some time before actually descending. */

			/* This condition only occurs for helicopters, during descent,
			 * to a landing by the hanger of an international airport. */
			if (amdflag & AMED_HELI_LOWER) return AMS_TTDP_HELI_LAND_AIRPORT;

			/* This condition only occurs for helicopters, before starting descent,
			 * to a landing by the hanger of an international airport. */
			if (amdflag & AMED_SLOWTURN) return AMS_TTDP_FLIGHT_TO_TOWER;

			/* The final two conditions apply to helicopters or aircraft.
			 * Has reached hanger? */
			if (amdflag & AMED_EXACTPOS) return AMS_TTDP_HANGAR;

			/* Still moving towards hanger. */
			return AMS_TTDP_TO_HANGAR;

		case TERM1:
			if (amdflag & AMED_EXACTPOS) return AMS_TTDP_TO_PAD1;
			return AMS_TTDP_TO_JUNCTION;

		case TERM2:
			if (amdflag & AMED_EXACTPOS) return AMS_TTDP_TO_PAD2;
			return AMS_TTDP_TO_ENTRY_2_AND_3_AND_H;

		case TERM3:
		case TERM4:
		case TERM5:
		case TERM6:
		case TERM7:
		case TERM8:
			/* TTDPatch only has 3 terminals, so treat these states the same */
			if (amdflag & AMED_EXACTPOS) return AMS_TTDP_TO_PAD3;
			return AMS_TTDP_TO_ENTRY_2_AND_3_AND_H;

		case HELIPAD1:
		case HELIPAD2:
		case HELIPAD3:
			/* Will only occur for helicopters.*/
			if (amdflag & AMED_HELI_LOWER) return AMS_TTDP_HELI_LAND_AIRPORT; // Descending.
			if (amdflag & AMED_SLOWTURN)   return AMS_TTDP_FLIGHT_TO_TOWER;   // Still hasn't started descent.
			return AMS_TTDP_TO_JUNCTION; // On the ground.

		case TAKEOFF: // Moving to takeoff position.
			return AMS_TTDP_TO_OUTWAY;

		case STARTTAKEOFF: // Accelerating down runway.
			return AMS_TTDP_TAKEOFF;

		case ENDTAKEOFF: // Ascent
			return AMS_TTDP_CLIMBING;

		case HELITAKEOFF: // Helicopter is moving to take off position.
			if (afc->delta_z == 0) {
				return amdflag & AMED_HELI_RAISE ?
					AMS_TTDP_HELI_TAKEOFF_AIRPORT : AMS_TTDP_TO_JUNCTION;
			} else {
				return AMS_TTDP_HELI_TAKEOFF_HELIPORT;
			}

		case FLYING:
			return amdflag & AMED_HOLD ? AMS_TTDP_FLIGHT_APPROACH : AMS_TTDP_FLIGHT_TO_TOWER;

		case LANDING: // Descent
			return AMS_TTDP_FLIGHT_DESCENT;

		case ENDLANDING: // On the runway braking
			if (amdflag & AMED_BRAKE) return AMS_TTDP_BRAKING;
			/* Landed - moving off runway */
			return AMS_TTDP_TO_INWAY;

		case HELILANDING:
		case HELIENDLANDING: // Helicoptor is decending.
			if (amdflag & AMED_HELI_LOWER) {
				return afc->delta_z == 0 ?
					AMS_TTDP_HELI_LAND_AIRPORT : AMS_TTDP_HELI_LAND_HELIPORT;
			} else {
				return AMS_TTDP_FLIGHT_TO_TOWER;
			}

		default:
			return AMS_TTDP_HANGAR;
	}
}


/* TTDP style aircraft movement action for GRF Action 2 Var 0xE6 */
enum TTDPAircraftMovementActions {
	AMA_TTDP_IN_HANGAR,
	AMA_TTDP_ON_PAD1,
	AMA_TTDP_ON_PAD2,
	AMA_TTDP_ON_PAD3,
	AMA_TTDP_HANGAR_TO_PAD1,
	AMA_TTDP_HANGAR_TO_PAD2,
	AMA_TTDP_HANGAR_TO_PAD3,
	AMA_TTDP_LANDING_TO_PAD1,
	AMA_TTDP_LANDING_TO_PAD2,
	AMA_TTDP_LANDING_TO_PAD3,
	AMA_TTDP_PAD1_TO_HANGAR,
	AMA_TTDP_PAD2_TO_HANGAR,
	AMA_TTDP_PAD3_TO_HANGAR,
	AMA_TTDP_PAD1_TO_TAKEOFF,
	AMA_TTDP_PAD2_TO_TAKEOFF,
	AMA_TTDP_PAD3_TO_TAKEOFF,
	AMA_TTDP_HANGAR_TO_TAKOFF,
	AMA_TTDP_LANDING_TO_HANGAR,
	AMA_TTDP_IN_FLIGHT,
};


/**
 * Map OTTD aircraft movement states to TTDPatch style movement actions
 * (VarAction 2 Variable 0xE6)
 * This is not fully supported yet but it's enough for Planeset.
 */
static byte MapAircraftMovementAction(const Aircraft *v)
{
	switch (v->state) {
		case HANGAR:
			return (v->cur_speed > 0) ? AMA_TTDP_LANDING_TO_HANGAR : AMA_TTDP_IN_HANGAR;

		case TERM1:
		case HELIPAD1:
			return (v->current_order.IsType(OT_LOADING)) ? AMA_TTDP_ON_PAD1 : AMA_TTDP_LANDING_TO_PAD1;

		case TERM2:
		case HELIPAD2:
			return (v->current_order.IsType(OT_LOADING)) ? AMA_TTDP_ON_PAD2 : AMA_TTDP_LANDING_TO_PAD2;

		case TERM3:
		case TERM4:
		case TERM5:
		case TERM6:
		case TERM7:
		case TERM8:
		case HELIPAD3:
			return (v->current_order.IsType(OT_LOADING)) ? AMA_TTDP_ON_PAD3 : AMA_TTDP_LANDING_TO_PAD3;

		case TAKEOFF:      // Moving to takeoff position
		case STARTTAKEOFF: // Accelerating down runway
		case ENDTAKEOFF:   // Ascent
		case HELITAKEOFF:
			/* @todo Need to find which terminal (or hanger) we've come from. How? */
			return AMA_TTDP_PAD1_TO_TAKEOFF;

		case FLYING:
			return AMA_TTDP_IN_FLIGHT;

		case LANDING:    // Descent
		case ENDLANDING: // On the runway braking
		case HELILANDING:
		case HELIENDLANDING:
			/* @todo Need to check terminal we're landing to. Is it known yet? */
			return (v->current_order.IsType(OT_GOTO_DEPOT)) ?
				AMA_TTDP_LANDING_TO_HANGAR : AMA_TTDP_LANDING_TO_PAD1;

		default:
			return AMA_TTDP_IN_HANGAR;
	}
}


/* Vehicle Resolver Functions */
static inline const Vehicle *GRV(const ResolverObject *object)
{
	switch (object->scope) {
		default: NOT_REACHED();
		case VSG_SCOPE_SELF: return object->u.vehicle.self;
		case VSG_SCOPE_PARENT: return object->u.vehicle.parent;
		case VSG_SCOPE_RELATIVE: {
			if (object->u.vehicle.self == NULL) return NULL;
			const Vehicle *v = NULL;
			switch (GB(object->count, 6, 2)) {
				default: NOT_REACHED();
				case 0x00: // count back (away from the engine), starting at this vehicle
				case 0x01: // count forward (toward the engine), starting at this vehicle
					v = object->u.vehicle.self;
					break;
				case 0x02: // count back, starting at the engine
					v = object->u.vehicle.parent;
					break;
				case 0x03: { // count back, starting at the first vehicle in this chain of vehicles with the same ID, as for vehicle variable 41
					const Vehicle *self = object->u.vehicle.self;
					for (const Vehicle *u = self->First(); u != self; u = u->Next()) {
						if (u->engine_type != self->engine_type) {
							v = NULL;
						} else {
							if (v == NULL) v = u;
						}
					}
					if (v == NULL) v = self;
					break;
				}
			}
			uint32 count = GB(object->count, 0, 4);
			if (count == 0) count = GetRegister(0x100);
			while (v != NULL && count-- != 0) v = (GB(object->count, 6, 2) == 0x01) ? v->Previous() : v->Next();
			return v;
		}
	}
}


static uint32 VehicleGetRandomBits(const ResolverObject *object)
{
	return GRV(object) == NULL ? 0 : GRV(object)->random_bits;
}


static uint32 VehicleGetTriggers(const ResolverObject *object)
{
	return GRV(object) == NULL ? 0 : GRV(object)->waiting_triggers;
}


static void VehicleSetTriggers(const ResolverObject *object, int triggers)
{
	/* Evil cast to get around const-ness. This used to be achieved by an
	 * innocent looking function pointer cast... Currently I cannot see a
	 * way of avoiding this without removing consts deep within gui code.
	 */
	Vehicle *v = const_cast<Vehicle *>(GRV(object));

	/* This function must only be called when processing triggers -- any
	 * other time is an error. */
	assert(object->trigger != 0);

	if (v != NULL) v->waiting_triggers = triggers;
}


/**
 * Determines the livery of an engine.
 *
 * This always uses dual company colours independent of GUI settings. So it is desync-safe.
 *
 * @param engine Engine type
 * @param v Vehicle, NULL in purchase list.
 * @return Livery to use
 */
static const Livery *LiveryHelper(EngineID engine, const Vehicle *v)
{
	const Livery *l;

	if (v == NULL) {
		if (!Company::IsValidID(_current_company)) return NULL;
		l = GetEngineLivery(engine, _current_company, INVALID_ENGINE, NULL, LIT_ALL);
	} else if (v->IsGroundVehicle()) {
		l = GetEngineLivery(v->engine_type, v->owner, v->GetGroundVehicleCache()->first_engine, v, LIT_ALL);
	} else {
		l = GetEngineLivery(v->engine_type, v->owner, INVALID_ENGINE, v, LIT_ALL);
	}

	return l;
}

/**
 * Helper to get the position of a vehicle within a chain of vehicles.
 * @param v the vehicle to get the position of.
 * @param consecutive whether to look at the whole chain or the vehicles
 *                    with the same 'engine type'.
 * @return the position in the chain from front and tail and chain length.
 */
static uint32 PositionHelper(const Vehicle *v, bool consecutive)
{
	const Vehicle *u;
	byte chain_before = 0;
	byte chain_after  = 0;

	for (u = v->First(); u != v; u = u->Next()) {
		chain_before++;
		if (consecutive && u->engine_type != v->engine_type) chain_before = 0;
	}

	while (u->Next() != NULL && (!consecutive || u->Next()->engine_type == v->engine_type)) {
		chain_after++;
		u = u->Next();
	}

	return chain_before | chain_after << 8 | (chain_before + chain_after + consecutive) << 16;
}

static uint32 VehicleGetVariable(Vehicle *v, const ResolverObject *object, byte variable, uint32 parameter, bool *available)
{
	/* Calculated vehicle parameters */
	switch (variable) {
		case 0x25: // Get engine GRF ID
			return v->GetGRFID();

		case 0x40: // Get length of consist
			if (!HasBit(v->grf_cache.cache_valid, NCVV_POSITION_CONSIST_LENGTH)) {
				v->grf_cache.position_consist_length = PositionHelper(v, false);
				SetBit(v->grf_cache.cache_valid, NCVV_POSITION_CONSIST_LENGTH);
			}
			return v->grf_cache.position_consist_length;

		case 0x41: // Get length of same consecutive wagons
			if (!HasBit(v->grf_cache.cache_valid, NCVV_POSITION_SAME_ID_LENGTH)) {
				v->grf_cache.position_same_id_length = PositionHelper(v, true);
				SetBit(v->grf_cache.cache_valid, NCVV_POSITION_SAME_ID_LENGTH);
			}
			return v->grf_cache.position_same_id_length;

		case 0x42: // Consist cargo information
			if (!HasBit(v->grf_cache.cache_valid, NCVV_CONSIST_CARGO_INFORMATION)) {
				const Vehicle *u;
				byte cargo_classes = 0;
				uint8 common_cargos[NUM_CARGO];
				uint8 common_subtypes[256];
				byte user_def_data = 0;
				CargoID common_cargo_type = CT_INVALID;
				uint8 common_subtype = 0xFF; // Return 0xFF if nothing is carried

				/* Reset our arrays */
				memset(common_cargos, 0, sizeof(common_cargos));
				memset(common_subtypes, 0, sizeof(common_subtypes));

				for (u = v; u != NULL; u = u->Next()) {
					if (v->type == VEH_TRAIN) user_def_data |= Train::From(u)->tcache.user_def_data;

					/* Skip empty engines */
					if (u->cargo_cap == 0) continue;

					cargo_classes |= CargoSpec::Get(u->cargo_type)->classes;
					common_cargos[u->cargo_type]++;
				}

				/* Pick the most common cargo type */
				uint common_cargo_best_amount = 0;
				for (CargoID cargo = 0; cargo < NUM_CARGO; cargo++) {
					if (common_cargos[cargo] > common_cargo_best_amount) {
						common_cargo_best_amount = common_cargos[cargo];
						common_cargo_type = cargo;
					}
				}

				/* Count subcargo types of common_cargo_type */
				for (u = v; u != NULL; u = u->Next()) {
					/* Skip empty engines and engines not carrying common_cargo_type */
					if (u->cargo_cap == 0 || u->cargo_type != common_cargo_type) continue;

					common_subtypes[u->cargo_subtype]++;
				}

				/* Pick the most common subcargo type*/
				uint common_subtype_best_amount = 0;
				for (uint i = 0; i < lengthof(common_subtypes); i++) {
					if (common_subtypes[i] > common_subtype_best_amount) {
						common_subtype_best_amount = common_subtypes[i];
						common_subtype = i;
					}
				}

				/* Unlike everywhere else the cargo translation table is only used since grf version 8, not 7. */
				const GRFFile *grffile = v->GetGRF();
				uint8 common_bitnum = (common_cargo_type == CT_INVALID) ? 0xFF :
					(grffile->grf_version < 8) ? CargoSpec::Get(common_cargo_type)->bitnum : grffile->cargo_map[common_cargo_type];
				v->grf_cache.consist_cargo_information = cargo_classes | (common_bitnum << 8) | (common_subtype << 16) | (user_def_data << 24);
				SetBit(v->grf_cache.cache_valid, NCVV_CONSIST_CARGO_INFORMATION);
			}
			return v->grf_cache.consist_cargo_information;

		case 0x43: // Company information
			if (!HasBit(v->grf_cache.cache_valid, NCVV_COMPANY_INFORMATION)) {
				v->grf_cache.company_information = GetCompanyInfo(v->owner, LiveryHelper(v->engine_type, v));
				SetBit(v->grf_cache.cache_valid, NCVV_COMPANY_INFORMATION);
			}
			return v->grf_cache.company_information;

		case 0x44: // Aircraft information
			if (v->type != VEH_AIRCRAFT || !Aircraft::From(v)->IsNormalAircraft()) return UINT_MAX;

			{
				const Vehicle *w = v->Next();
				uint16 altitude = v->z_pos - w->z_pos; // Aircraft height - shadow height
				byte airporttype = ATP_TTDP_LARGE;

				const Station *st = GetTargetAirportIfValid(Aircraft::From(v));

				if (st != NULL && st->airport.tile != INVALID_TILE) {
					airporttype = st->airport.GetSpec()->ttd_airport_type;
				}

				return (altitude << 8) | airporttype;
			}

		case 0x45: { // Curvature info
			/* Format: xxxTxBxF
			 * F - previous wagon to current wagon, 0 if vehicle is first
			 * B - current wagon to next wagon, 0 if wagon is last
			 * T - previous wagon to next wagon, 0 in an S-bend
			 */
			if (!v->IsGroundVehicle()) return 0;

			const Vehicle *u_p = v->Previous();
			const Vehicle *u_n = v->Next();
			DirDiff f = (u_p == NULL) ?  DIRDIFF_SAME : DirDifference(u_p->direction, v->direction);
			DirDiff b = (u_n == NULL) ?  DIRDIFF_SAME : DirDifference(v->direction, u_n->direction);
			DirDiff t = ChangeDirDiff(f, b);

			return ((t > DIRDIFF_REVERSE ? t | 8 : t) << 16) |
			       ((b > DIRDIFF_REVERSE ? b | 8 : b) <<  8) |
			       ( f > DIRDIFF_REVERSE ? f | 8 : f);
		}

		case 0x46: // Motion counter
			return v->motion_counter;

		case 0x47: { // Vehicle cargo info
			/* Format: ccccwwtt
			 * tt - the cargo type transported by the vehicle,
			 *     translated if a translation table has been installed.
			 * ww - cargo unit weight in 1/16 tons, same as cargo prop. 0F.
			 * cccc - the cargo class value of the cargo transported by the vehicle.
			 */
			const CargoSpec *cs = CargoSpec::Get(v->cargo_type);

			return (cs->classes << 16) | (cs->weight << 8) | v->GetGRF()->cargo_map[v->cargo_type];
		}

		case 0x48: return v->GetEngine()->flags; // Vehicle Type Info
		case 0x49: return v->build_year;

		case 0x4A: {
			if (v->type != VEH_TRAIN) return 0;
			RailType rt = GetTileRailType(v->tile);
			return (HasPowerOnRail(Train::From(v)->railtype, rt) ? 0x100 : 0) | GetReverseRailTypeTranslation(rt, object->grffile);
		}

		case 0x4B: // Long date of last service
			return v->date_of_last_service;

		/* Variables which use the parameter */
		case 0x60: // Count consist's engine ID occurance
			if (v->type != VEH_TRAIN) return v->GetEngine()->grf_prop.local_id == parameter ? 1 : 0;

			{
				uint count = 0;
				for (; v != NULL; v = v->Next()) {
					if (v->GetEngine()->grf_prop.local_id == parameter) count++;
				}
				return count;
			}

		case 0x61: // Get variable of n-th vehicle in chain [signed number relative to vehicle]
			if (!v->IsGroundVehicle() || parameter == 0x61) return 0;

			/* Only allow callbacks that don't change properties to avoid circular dependencies. */
			if (object->callback == CBID_NO_CALLBACK || object->callback == CBID_TRAIN_ALLOW_WAGON_ATTACH || object->callback == CBID_VEHICLE_START_STOP_CHECK || object->callback == CBID_VEHICLE_32DAY_CALLBACK) {
				Vehicle *u = v->Move((int32)GetRegister(0x10F));
				if (u == NULL) return 0;

				return VehicleGetVariable(u, object, parameter, GetRegister(0x10E), available);
			}
			return 0;

		case 0x62: { // Curvature/position difference for n-th vehicle in chain [signed number relative to vehicle]
			/* Format: zzyyxxFD
			 * zz - Signed difference of z position between the selected and this vehicle.
			 * yy - Signed difference of y position between the selected and this vehicle.
			 * xx - Signed difference of x position between the selected and this vehicle.
			 * F  - Flags, bit 7 corresponds to VS_HIDDEN.
			 * D  - Dir difference, like in 0x45.
			 */
			if (!v->IsGroundVehicle()) return 0;

			const Vehicle *u = v->Move((int8)parameter);
			if (u == NULL) return 0;

			/* Get direction difference. */
			bool prev = (int8)parameter < 0;
			uint32 ret = prev ? DirDifference(u->direction, v->direction) : DirDifference(v->direction, u->direction);
			if (ret > DIRDIFF_REVERSE) ret |= 0x08;

			if (u->vehstatus & VS_HIDDEN) ret |= 0x80;

			/* Get position difference. */
			ret |= ((prev ? u->x_pos - v->x_pos : v->x_pos - u->x_pos) & 0xFF) << 8;
			ret |= ((prev ? u->y_pos - v->y_pos : v->y_pos - u->y_pos) & 0xFF) << 16;
			ret |= ((prev ? u->z_pos - v->z_pos : v->z_pos - u->z_pos) & 0xFF) << 24;

			return ret;
		}

		case 0xFE:
		case 0xFF: {
			uint16 modflags = 0;

			if (v->type == VEH_TRAIN) {
				const Train *t = Train::From(v);
				bool is_powered_wagon = HasBit(t->flags, VRF_POWEREDWAGON);
				const Train *u = is_powered_wagon ? t->First() : t; // for powered wagons the engine defines the type of engine (i.e. railtype)
				RailType railtype = GetRailType(v->tile);
				bool powered = t->IsEngine() || is_powered_wagon;
				bool has_power = HasPowerOnRail(u->railtype, railtype);

				if (powered && has_power) SetBit(modflags, 5);
				if (powered && !has_power) SetBit(modflags, 6);
				if (HasBit(t->flags, VRF_TOGGLE_REVERSE)) SetBit(modflags, 8);
			}
			if (HasBit(v->vehicle_flags, VF_BUILT_AS_PROTOTYPE)) SetBit(modflags, 10);

			return variable == 0xFE ? modflags : GB(modflags, 8, 8);
		}
	}

	/* General vehicle properties */
	switch (variable - 0x80) {
		case 0x00: return v->type + 0x10;
		case 0x01: return MapOldSubType(v);
		case 0x04: return v->index;
		case 0x05: return GB(v->index, 8, 8);
		case 0x0A: return v->current_order.MapOldOrder();
		case 0x0B: return v->current_order.GetDestination();
		case 0x0C: return v->GetNumOrders();
		case 0x0D: return v->cur_real_order_index;
		case 0x10:
		case 0x11: {
			uint ticks;
			if (v->current_order.IsType(OT_LOADING)) {
				ticks = v->load_unload_ticks;
			} else {
				switch (v->type) {
					case VEH_TRAIN:    ticks = Train::From(v)->wait_counter; break;
					case VEH_AIRCRAFT: ticks = Aircraft::From(v)->turn_counter; break;
					default:           ticks = 0; break;
				}
			}
			return (variable - 0x80) == 0x10 ? ticks : GB(ticks, 8, 8);
		}
		case 0x12: return Clamp(v->date_of_last_service - DAYS_TILL_ORIGINAL_BASE_YEAR, 0, 0xFFFF);
		case 0x13: return GB(Clamp(v->date_of_last_service - DAYS_TILL_ORIGINAL_BASE_YEAR, 0, 0xFFFF), 8, 8);
		case 0x14: return v->service_interval;
		case 0x15: return GB(v->service_interval, 8, 8);
		case 0x16: return v->last_station_visited;
		case 0x17: return v->tick_counter;
		case 0x18:
		case 0x19: {
			uint max_speed;
			switch (v->type) {
				case VEH_AIRCRAFT:
					max_speed = Aircraft::From(v)->GetSpeedOldUnits(); // Convert to old units.
					break;

				default:
					max_speed = v->vcache.cached_max_speed;
					break;
			}
			return (variable - 0x80) == 0x18 ? max_speed : GB(max_speed, 8, 8);
		}
		case 0x1A: return v->x_pos;
		case 0x1B: return GB(v->x_pos, 8, 8);
		case 0x1C: return v->y_pos;
		case 0x1D: return GB(v->y_pos, 8, 8);
		case 0x1E: return v->z_pos;
		case 0x1F: return object->u.vehicle.info_view ? DIR_W : v->direction;
		case 0x28: return v->cur_image;
		case 0x29: return GB(v->cur_image, 8, 8);
		case 0x32: return v->vehstatus;
		case 0x33: return 0; // non-existent high byte of vehstatus
		case 0x34: return v->type == VEH_AIRCRAFT ? (v->cur_speed * 10) / 128 : v->cur_speed;
		case 0x35: return GB(v->type == VEH_AIRCRAFT ? (v->cur_speed * 10) / 128 : v->cur_speed, 8, 8);
		case 0x36: return v->subspeed;
		case 0x37: return v->acceleration;
		case 0x39: return v->cargo_type;
		case 0x3A: return v->cargo_cap;
		case 0x3B: return GB(v->cargo_cap, 8, 8);
		case 0x3C: return ClampToU16(v->cargo.Count());
		case 0x3D: return GB(ClampToU16(v->cargo.Count()), 8, 8);
		case 0x3E: return v->cargo.Source();
		case 0x3F: return ClampU(v->cargo.DaysInTransit(), 0, 0xFF);
		case 0x40: return ClampToU16(v->age);
		case 0x41: return GB(ClampToU16(v->age), 8, 8);
		case 0x42: return ClampToU16(v->max_age);
		case 0x43: return GB(ClampToU16(v->max_age), 8, 8);
		case 0x44: return Clamp(v->build_year, ORIGINAL_BASE_YEAR, ORIGINAL_MAX_YEAR) - ORIGINAL_BASE_YEAR;
		case 0x45: return v->unitnumber;
		case 0x46: return v->GetEngine()->grf_prop.local_id;
		case 0x47: return GB(v->GetEngine()->grf_prop.local_id, 8, 8);
		case 0x48:
			if (v->type != VEH_TRAIN || v->spritenum != 0xFD) return v->spritenum;
			return HasBit(Train::From(v)->flags, VRF_REVERSE_DIRECTION) ? 0xFE : 0xFD;

		case 0x49: return v->day_counter;
		case 0x4A: return v->breakdowns_since_last_service;
		case 0x4B: return v->breakdown_ctr;
		case 0x4C: return v->breakdown_delay;
		case 0x4D: return v->breakdown_chance;
		case 0x4E: return v->reliability;
		case 0x4F: return GB(v->reliability, 8, 8);
		case 0x50: return v->reliability_spd_dec;
		case 0x51: return GB(v->reliability_spd_dec, 8, 8);
		case 0x52: return ClampToI32(v->GetDisplayProfitThisYear());
		case 0x53: return GB(ClampToI32(v->GetDisplayProfitThisYear()),  8, 24);
		case 0x54: return GB(ClampToI32(v->GetDisplayProfitThisYear()), 16, 16);
		case 0x55: return GB(ClampToI32(v->GetDisplayProfitThisYear()), 24,  8);
		case 0x56: return ClampToI32(v->GetDisplayProfitLastYear());
		case 0x57: return GB(ClampToI32(v->GetDisplayProfitLastYear()),  8, 24);
		case 0x58: return GB(ClampToI32(v->GetDisplayProfitLastYear()), 16, 16);
		case 0x59: return GB(ClampToI32(v->GetDisplayProfitLastYear()), 24,  8);
		case 0x5A: return v->Next() == NULL ? INVALID_VEHICLE : v->Next()->index;
		case 0x5C: return ClampToI32(v->value);
		case 0x5D: return GB(ClampToI32(v->value),  8, 24);
		case 0x5E: return GB(ClampToI32(v->value), 16, 16);
		case 0x5F: return GB(ClampToI32(v->value), 24,  8);
		case 0x72: return v->cargo_subtype;
		case 0x7A: return v->random_bits;
		case 0x7B: return v->waiting_triggers;
	}

	/* Vehicle specific properties */
	switch (v->type) {
		case VEH_TRAIN: {
			Train *t = Train::From(v);
			switch (variable - 0x80) {
				case 0x62: return t->track;
				case 0x66: return t->railtype;
				case 0x73: return t->gcache.cached_veh_length;
				case 0x74: return t->gcache.cached_power;
				case 0x75: return GB(t->gcache.cached_power,  8, 24);
				case 0x76: return GB(t->gcache.cached_power, 16, 16);
				case 0x77: return GB(t->gcache.cached_power, 24,  8);
				case 0x7C: return t->First()->index;
				case 0x7D: return GB(t->First()->index, 8, 8);
				case 0x7F: return 0; // Used for vehicle reversing hack in TTDP
			}
			break;
		}

		case VEH_ROAD: {
			RoadVehicle *rv = RoadVehicle::From(v);
			switch (variable - 0x80) {
				case 0x62: return rv->state;
				case 0x64: return rv->blocked_ctr;
				case 0x65: return GB(rv->blocked_ctr, 8, 8);
				case 0x66: return rv->overtaking;
				case 0x67: return rv->overtaking_ctr;
				case 0x68: return rv->crashed_ctr;
				case 0x69: return GB(rv->crashed_ctr, 8, 8);
			}
			break;
		}

		case VEH_AIRCRAFT: {
			Aircraft *a = Aircraft::From(v);
			switch (variable - 0x80) {
				case 0x62: return MapAircraftMovementState(a);  // Current movement state
				case 0x63: return a->targetairport;             // Airport to which the action refers
				case 0x66: return MapAircraftMovementAction(a); // Current movement action
			}
			break;
		}

		default: break;
	}

	DEBUG(grf, 1, "Unhandled vehicle variable 0x%X, type 0x%X", variable, (uint)v->type);

	*available = false;
	return UINT_MAX;
}

static uint32 VehicleGetVariable(const ResolverObject *object, byte variable, uint32 parameter, bool *available)
{
	Vehicle *v = const_cast<Vehicle*>(GRV(object));

	if (v == NULL) {
		/* Vehicle does not exist, so we're in a purchase list */
		switch (variable) {
			case 0x43: return GetCompanyInfo(_current_company, LiveryHelper(object->u.vehicle.self_type, NULL)); // Owner information
			case 0x46: return 0;               // Motion counter
			case 0x47: { // Vehicle cargo info
				const Engine *e = Engine::Get(object->u.vehicle.self_type);
				CargoID cargo_type = e->GetDefaultCargoType();
				if (cargo_type != CT_INVALID) {
					const CargoSpec *cs = CargoSpec::Get(cargo_type);
					return (cs->classes << 16) | (cs->weight << 8) | e->GetGRF()->cargo_map[cargo_type];
				} else {
					return 0x000000FF;
				}
			}
			case 0x48: return Engine::Get(object->u.vehicle.self_type)->flags; // Vehicle Type Info
			case 0x49: return _cur_year; // 'Long' format build year
			case 0x4B: return _date; // Long date of last service
			case 0x92: return Clamp(_date - DAYS_TILL_ORIGINAL_BASE_YEAR, 0, 0xFFFF); // Date of last service
			case 0x93: return GB(Clamp(_date - DAYS_TILL_ORIGINAL_BASE_YEAR, 0, 0xFFFF), 8, 8);
			case 0xC4: return Clamp(_cur_year, ORIGINAL_BASE_YEAR, ORIGINAL_MAX_YEAR) - ORIGINAL_BASE_YEAR; // Build year
			case 0xDA: return INVALID_VEHICLE; // Next vehicle
			case 0xF2: return 0; // Cargo subtype
		}

		*available = false;
		return UINT_MAX;
	}

	return VehicleGetVariable(v, object, variable, parameter, available);
}


static const SpriteGroup *VehicleResolveReal(const ResolverObject *object, const RealSpriteGroup *group)
{
	const Vehicle *v = object->u.vehicle.self;

	if (v == NULL) {
		if (group->num_loading > 0) return group->loading[0];
		if (group->num_loaded  > 0) return group->loaded[0];
		return NULL;
	}

	bool in_motion = !v->First()->current_order.IsType(OT_LOADING);

	uint totalsets = in_motion ? group->num_loaded : group->num_loading;

	if (totalsets == 0) return NULL;

	uint set = (v->cargo.Count() * totalsets) / max((uint16)1, v->cargo_cap);
	set = min(set, totalsets - 1);

	return in_motion ? group->loaded[set] : group->loading[set];
}


static inline void NewVehicleResolver(ResolverObject *res, EngineID engine_type, const Vehicle *v)
{
	res->GetRandomBits = &VehicleGetRandomBits;
	res->GetTriggers   = &VehicleGetTriggers;
	res->SetTriggers   = &VehicleSetTriggers;
	res->GetVariable   = &VehicleGetVariable;
	res->ResolveReal   = &VehicleResolveReal;

	res->u.vehicle.self   = v;
	res->u.vehicle.parent = (v != NULL) ? v->First() : v;

	res->u.vehicle.self_type = engine_type;
	res->u.vehicle.info_view = false;

	res->callback        = CBID_NO_CALLBACK;
	res->callback_param1 = 0;
	res->callback_param2 = 0;
	res->ResetState();

	const Engine *e = Engine::Get(engine_type);
	res->grffile         = (e != NULL ? e->GetGRF() : NULL);
}


/**
 * Retrieve the SpriteGroup for the specified vehicle.
 * If the vehicle is not specified, the purchase list group for the engine is
 * chosen. For trains, an additional engine override lookup is performed.
 * @param engine    Engine type of the vehicle.
 * @param v         The vehicle itself.
 * @param use_cache Use cached override
 * @returns         The selected SpriteGroup for the vehicle.
 */
static const SpriteGroup *GetVehicleSpriteGroup(EngineID engine, const Vehicle *v, bool use_cache = true)
{
	const SpriteGroup *group;
	CargoID cargo;

	if (v == NULL) {
		cargo = CT_PURCHASE;
	} else {
		cargo = v->cargo_type;

		if (v->IsGroundVehicle()) {
			/* For trains we always use cached value, except for callbacks because the override spriteset
			 * to use may be different than the one cached. It happens for callback 0x15 (refit engine),
			 * as v->cargo_type is temporary changed to the new type */
			if (use_cache && v->type == VEH_TRAIN) {
				group = Train::From(v)->tcache.cached_override;
			} else {
				group = GetWagonOverrideSpriteSet(v->engine_type, v->cargo_type, v->GetGroundVehicleCache()->first_engine);
			}
			if (group != NULL) return group;
		}
	}

	const Engine *e = Engine::Get(engine);

	assert(cargo < lengthof(e->grf_prop.spritegroup));
	group = e->grf_prop.spritegroup[cargo];
	if (group != NULL) return group;

	/* Fall back to the default set if the selected cargo type is not defined */
	return e->grf_prop.spritegroup[CT_DEFAULT];
}


SpriteID GetCustomEngineSprite(EngineID engine, const Vehicle *v, Direction direction, EngineImageType image_type)
{
	const SpriteGroup *group;
	ResolverObject object;

	NewVehicleResolver(&object, engine, v);

	object.callback_param1 = image_type;

	group = SpriteGroup::Resolve(GetVehicleSpriteGroup(engine, v), &object);
	if (group == NULL || group->GetNumResults() == 0) return 0;

	return group->GetResult() + (direction % group->GetNumResults());
}


SpriteID GetRotorOverrideSprite(EngineID engine, const Aircraft *v, bool info_view, EngineImageType image_type)
{
	const Engine *e = Engine::Get(engine);

	/* Only valid for helicopters */
	assert(e->type == VEH_AIRCRAFT);
	assert(!(e->u.air.subtype & AIR_CTOL));

	ResolverObject object;

	NewVehicleResolver(&object, engine, v);

	object.callback_param1 = image_type;
	object.u.vehicle.info_view = info_view;

	const SpriteGroup *group = GetWagonOverrideSpriteSet(engine, CT_DEFAULT, engine);
	group = SpriteGroup::Resolve(group, &object);

	if (group == NULL || group->GetNumResults() == 0) return 0;

	if (v == NULL) return group->GetResult();

	return group->GetResult() + (info_view ? 0 : (v->Next()->Next()->state % group->GetNumResults()));
}


/**
 * Check if a wagon is currently using a wagon override
 * @param v The wagon to check
 * @return true if it is using an override, false otherwise
 */
bool UsesWagonOverride(const Vehicle *v)
{
	assert(v->type == VEH_TRAIN);
	return Train::From(v)->tcache.cached_override != NULL;
}

/**
 * Evaluate a newgrf callback for vehicles
 * @param callback The callback to evalute
 * @param param1   First parameter of the callback
 * @param param2   Second parameter of the callback
 * @param engine   Engine type of the vehicle to evaluate the callback for
 * @param v        The vehicle to evaluate the callback for, or NULL if it doesnt exist yet
 * @return The value the callback returned, or CALLBACK_FAILED if it failed
 */
uint16 GetVehicleCallback(CallbackID callback, uint32 param1, uint32 param2, EngineID engine, const Vehicle *v)
{
	const SpriteGroup *group;
	ResolverObject object;

	NewVehicleResolver(&object, engine, v);

	object.callback        = callback;
	object.callback_param1 = param1;
	object.callback_param2 = param2;

	group = SpriteGroup::Resolve(GetVehicleSpriteGroup(engine, v, false), &object);
	if (group == NULL) return CALLBACK_FAILED;

	return group->GetCallbackResult();
}

/**
 * Evaluate a newgrf callback for vehicles with a different vehicle for parent scope.
 * @param callback The callback to evalute
 * @param param1   First parameter of the callback
 * @param param2   Second parameter of the callback
 * @param engine   Engine type of the vehicle to evaluate the callback for
 * @param v        The vehicle to evaluate the callback for, or NULL if it doesnt exist yet
 * @param parent   The vehicle to use for parent scope
 * @return The value the callback returned, or CALLBACK_FAILED if it failed
 */
uint16 GetVehicleCallbackParent(CallbackID callback, uint32 param1, uint32 param2, EngineID engine, const Vehicle *v, const Vehicle *parent)
{
	const SpriteGroup *group;
	ResolverObject object;

	NewVehicleResolver(&object, engine, v);

	object.callback        = callback;
	object.callback_param1 = param1;
	object.callback_param2 = param2;

	object.u.vehicle.parent = parent;

	group = SpriteGroup::Resolve(GetVehicleSpriteGroup(engine, v, false), &object);
	if (group == NULL) return CALLBACK_FAILED;

	return group->GetCallbackResult();
}


/* Callback 36 handlers */
uint GetVehicleProperty(const Vehicle *v, PropertyID property, uint orig_value)
{
	uint16 callback = GetVehicleCallback(CBID_VEHICLE_MODIFY_PROPERTY, property, 0, v->engine_type, v);
	if (callback != CALLBACK_FAILED) return callback;

	return orig_value;
}


uint GetEngineProperty(EngineID engine, PropertyID property, uint orig_value)
{
	uint16 callback = GetVehicleCallback(CBID_VEHICLE_MODIFY_PROPERTY, property, 0, engine, NULL);
	if (callback != CALLBACK_FAILED) return callback;

	return orig_value;
}


static void DoTriggerVehicle(Vehicle *v, VehicleTrigger trigger, byte base_random_bits, bool first)
{
	const SpriteGroup *group;
	ResolverObject object;
	byte new_random_bits;

	/* We can't trigger a non-existent vehicle... */
	assert(v != NULL);

	NewVehicleResolver(&object, v->engine_type, v);
	object.callback = CBID_RANDOM_TRIGGER;
	object.trigger = trigger;

	group = SpriteGroup::Resolve(GetVehicleSpriteGroup(v->engine_type, v), &object);
	if (group == NULL) return;

	new_random_bits = Random();
	uint32 reseed = object.GetReseedSum(); // The scope only affects triggers, not the reseeding
	v->random_bits &= ~reseed;
	v->random_bits |= (first ? new_random_bits : base_random_bits) & reseed;

	switch (trigger) {
		case VEHICLE_TRIGGER_NEW_CARGO:
			/* All vehicles in chain get ANY_NEW_CARGO trigger now.
			 * So we call it for the first one and they will recurse.
			 * Indexing part of vehicle random bits needs to be
			 * same for all triggered vehicles in the chain (to get
			 * all the random-cargo wagons carry the same cargo,
			 * i.e.), so we give them all the NEW_CARGO triggered
			 * vehicle's portion of random bits. */
			assert(first);
			DoTriggerVehicle(v->First(), VEHICLE_TRIGGER_ANY_NEW_CARGO, new_random_bits, false);
			break;

		case VEHICLE_TRIGGER_DEPOT:
			/* We now trigger the next vehicle in chain recursively.
			 * The random bits portions may be different for each
			 * vehicle in chain. */
			if (v->Next() != NULL) DoTriggerVehicle(v->Next(), trigger, 0, true);
			break;

		case VEHICLE_TRIGGER_EMPTY:
			/* We now trigger the next vehicle in chain
			 * recursively.  The random bits portions must be same
			 * for each vehicle in chain, so we give them all
			 * first chained vehicle's portion of random bits. */
			if (v->Next() != NULL) DoTriggerVehicle(v->Next(), trigger, first ? new_random_bits : base_random_bits, false);
			break;

		case VEHICLE_TRIGGER_ANY_NEW_CARGO:
			/* Now pass the trigger recursively to the next vehicle
			 * in chain. */
			assert(!first);
			if (v->Next() != NULL) DoTriggerVehicle(v->Next(), VEHICLE_TRIGGER_ANY_NEW_CARGO, base_random_bits, false);
			break;

		case VEHICLE_TRIGGER_CALLBACK_32:
			/* Do not do any recursion */
			break;
	}
}

void TriggerVehicle(Vehicle *v, VehicleTrigger trigger)
{
	if (trigger == VEHICLE_TRIGGER_DEPOT) {
		/* store that the vehicle entered a depot this tick */
		VehicleEnteredDepotThisTick(v);
	}

	v->InvalidateNewGRFCacheOfChain();
	DoTriggerVehicle(v, trigger, 0, true);
	v->InvalidateNewGRFCacheOfChain();
}

/* Functions for changing the order of vehicle purchase lists
 * This is currently only implemented for rail vehicles. */

/**
 * Get the list position of an engine.
 * Used when sorting a list of engines.
 * @param engine ID of the engine.
 * @return The list position of the engine.
 */
uint ListPositionOfEngine(EngineID engine)
{
	const Engine *e = Engine::Get(engine);
	/* Crude sorting to group by GRF ID */
	return (e->GetGRFID() * 256) + e->list_position;
}

struct ListOrderChange {
	EngineID engine;
	EngineID target;
};

static SmallVector<ListOrderChange, 16> _list_order_changes;

void AlterVehicleListOrder(EngineID engine, EngineID target)
{
	/* Add the list order change to a queue */
	ListOrderChange *loc = _list_order_changes.Append();
	loc->engine = engine;
	loc->target = target;
}

void CommitVehicleListOrderChanges()
{
	/* List position to Engine map */
	typedef SmallMap<uint16, Engine *, 16> ListPositionMap;
	ListPositionMap lptr_map;

	const ListOrderChange *end = _list_order_changes.End();
	for (const ListOrderChange *it = _list_order_changes.Begin(); it != end; ++it) {
		EngineID engine = it->engine;
		EngineID target = it->target;

		if (engine == target) continue;

		Engine *source_e = Engine::Get(engine);
		Engine *target_e = NULL;

		/* Populate map with current list positions */
		Engine *e;
		FOR_ALL_ENGINES_OF_TYPE(e, source_e->type) {
			if (!_settings_game.vehicle.dynamic_engines || e->GetGRF() == source_e->GetGRF()) {
				if (e->grf_prop.local_id == target) target_e = e;
				lptr_map[e->list_position] = e;
			}
		}

		/* std::map sorted by default, SmallMap does not */
		lptr_map.SortByKey();

		/* Get the target position, if it exists */
		if (target_e != NULL) {
			uint16 target_position = target_e->list_position;

			bool moving = false;
			const ListPositionMap::Pair *end = lptr_map.End();
			for (ListPositionMap::Pair *it = lptr_map.Begin(); it != end; ++it) {
				if (it->first == target_position) moving = true;
				if (moving) it->second->list_position++;
			}

			source_e->list_position = target_position;
		}

		lptr_map.Clear();
	}

	/* Clear out the queue */
	_list_order_changes.Reset();
}

/**
 * Resolve an engine's spec and such so we can get a variable.
 * @param ro    The resolver object to fill.
 * @param index The vehicle to get the data from.
 */
void GetVehicleResolver(ResolverObject *ro, uint index)
{
	Vehicle *v = Vehicle::Get(index);
	NewVehicleResolver(ro, v->engine_type, v);
}

/**
 * Fill the grf_cache of the given vehicle.
 * @param v The vehicle to fill the cache for.
 */
void FillNewGRFVehicleCache(const Vehicle *v)
{
	ResolverObject ro;
	memset(&ro, 0, sizeof(ro));
	GetVehicleResolver(&ro, v->index);

	/* These variables we have to check; these are the ones with a cache. */
	static const int cache_entries[][2] = {
		{ 0x40, NCVV_POSITION_CONSIST_LENGTH },
		{ 0x41, NCVV_POSITION_SAME_ID_LENGTH },
		{ 0x42, NCVV_CONSIST_CARGO_INFORMATION },
		{ 0x43, NCVV_COMPANY_INFORMATION },
	};
	assert_compile(NCVV_END == lengthof(cache_entries));

	/* Resolve all the variables, so their caches are set. */
	for (size_t i = 0; i < lengthof(cache_entries); i++) {
		/* Only resolve when the cache isn't valid. */
		if (HasBit(v->grf_cache.cache_valid, cache_entries[i][1])) continue;
		bool stub;
		ro.GetVariable(&ro, cache_entries[i][0], 0, &stub);
	}

	/* Make sure really all bits are set. */
	assert(v->grf_cache.cache_valid == (1 << NCVV_END) - 1);
}