summaryrefslogtreecommitdiff
path: root/road_cmd.c
blob: 8d6afb4bc30038a0d7a825420fc5f510f64447f5 (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
#include "stdafx.h"
#include "ttd.h"
#include "table/strings.h"
#include "map.h"
#include "vehicle.h"
#include "viewport.h"
#include "command.h"
#include "player.h"
#include "town.h"
#include "gfx.h"
#include "table/directions.h"
#include "sound.h"

/* When true, GetTrackStatus for roads will treat roads under reconstruction
 * as normal roads instead of impassable. This is used when detecting whether
 * a road can be removed. This is of course ugly, but I don't know a better
 * solution just like that... */
static bool _road_special_gettrackstatus;

void RoadVehEnterDepot(Vehicle *v);


bool HasTileRoadAt(uint tile, int i)
{
	int mask;
	byte b;

	switch (TileType(tile)) {
	case MP_STREET:
		b = _map5[tile];

		if ((b & 0xF0) == 0) {
		} else if ((b & 0xF0) == 0x10) {
			b = (b&8)?5:10;
		} else if ((b & 0xF0) == 0x20) {
			return (~b & 3) == i;
		} else
			return false;
		break;

	case MP_STATION:
		b = _map5[tile];
		if (!IS_BYTE_INSIDE(b, 0x43, 0x43+8))
			return false;
		return ((~(b - 0x43) & 3) == i);

	case MP_TUNNELBRIDGE:
		mask = GetRoadBitsByTile(tile);
		b = 10; if (mask & 1) break;
		b = 5;  if (mask & 2) break;
		return false;

	default:
		return false;
	}

	return HASBIT(b, i);
}

static bool CheckAllowRemoveRoad(uint tile, uint br, bool *edge_road)
{
	int blocks;
	byte owner;
	uint n;
	*edge_road = true;

	if (_game_mode == GM_EDITOR)
		return true;

	blocks = GetRoadBitsByTile(tile);
	if (blocks == 0)
		return true;

	// Only do the special processing for actual players.
	if (_current_player >= MAX_PLAYERS)
		return true;

	// A railway crossing has the road owner in the map3_lo byte.
	if (IsTileType(tile, MP_STREET) && (_map5[tile] & 0xF0) == 0x10) {
		owner = _map3_lo[tile];
	} else {
		owner = _map_owner[tile];
	}
	// Only do the special processing if the road is owned
	// by a town
	if (owner != OWNER_TOWN) {
		return owner == OWNER_NONE || CheckOwnership(owner);
	}

	if (_cheats.magic_bulldozer.value)
		return true;

	// Get a bitmask of which neighbouring roads has a tile
	n = 0;
	if (blocks&0x25 && HasTileRoadAt(TILE_ADDXY(tile,-1, 0), 1)) n |= 8;
	if (blocks&0x2A && HasTileRoadAt(TILE_ADDXY(tile, 0, 1), 0)) n |= 4;
	if (blocks&0x19 && HasTileRoadAt(TILE_ADDXY(tile, 1, 0), 3)) n |= 2;
	if (blocks&0x16 && HasTileRoadAt(TILE_ADDXY(tile, 0,-1), 2)) n |= 1;

	// If 0 or 1 bits are set in n, or if no bits that match the bits to remove,
	// then allow it
	if ((n & (n-1)) != 0 && (n & br) != 0) {
		Town *t;
		*edge_road = false;
		// you can remove all kind of roads with extra dynamite
		if (_patches.extra_dynamite)
			return true;

		t = ClosestTownFromTile(tile, (uint)-1);
		SetDParam(0, t->index);
		_error_message = STR_2009_LOCAL_AUTHORITY_REFUSES;
		return false;
	}

	return true;
}

bool IsRoadDepotTile(TileIndex tile)
{
	return IsTileType(tile, MP_STREET) &&
					(_map5[tile] & 0xF0) == 0x20;
}

uint GetRoadBitsByTile(TileIndex tile)
{
	uint32 r = GetTileTrackStatus(tile, TRANSPORT_ROAD);
	return (byte)(r | (r >> 8));
}

// cost for removing inner/edge -roads
static const uint16 _road_remove_cost[2] = {50, 18};

/* Delete a piece of road
 * p1 = piece type
 */
int32 CmdRemoveRoad(int x, int y, uint32 flags, uint32 p1, uint32 p2)
{
	TileInfo ti;
	int32 cost;
	uint tile;
	Town *t;
	/*	true if the roadpiece was always removeable,
			false if it was a center piece. Affects town ratings drop
	*/
	bool edge_road;

	SET_EXPENSES_TYPE(EXPENSES_CONSTRUCTION);

	FindLandscapeHeight(&ti, x, y);
	tile = ti.tile;
	t = ClosestTownFromTile(tile, (uint)-1); // needed for town rating penalty

	// allow deleting road under bridge
	if (ti.type != MP_TUNNELBRIDGE && !EnsureNoVehicle(tile))
		return CMD_ERROR;

	{
		bool b;
		_road_special_gettrackstatus = true;
		b = CheckAllowRemoveRoad(tile, p1, &edge_road);
		_road_special_gettrackstatus = false;
		if (!b)
			return CMD_ERROR;
	}

	if (ti.type == MP_TUNNELBRIDGE) {
		if (!EnsureNoVehicleZ(tile, TilePixelHeight(tile)))
			return CMD_ERROR;

		if ((ti.map5 & 0xE9) == 0xE8) {
			if (p1 & 10) goto return_error;
		} else if ((ti.map5 & 0xE9) == 0xE9) {
			if (p1 & 5) goto return_error;
		} else
			goto return_error;

		cost = _price.remove_road * 2;

		if (flags & DC_EXEC) {
			_map5[tile] = ti.map5 & 0xC7;
			_map_owner[tile] = OWNER_NONE;
			MarkTileDirtyByTile(tile);
		}
		return cost;
	} else if (ti.type == MP_STREET) {
		if (!(ti.map5 & 0xF0)) {
			uint c = p1, t2;

			if (ti.tileh != 0  && (ti.map5 == 5 || ti.map5 == 10)) {
				c |= (c & 0xC) >> 2;
				c |= (c & 0x3) << 2;
			}

			// limit the bits to delete to the existing bits.
			if ((c &= ti.map5) == 0) goto return_error;

			// calculate the cost
			t2 = c;
			cost = 0;
			do {
				if (t2&1) cost += _price.remove_road;
			} while(t2>>=1);

			// check if you're allowed to remove the street owned by a town
			// removal allowance depends on difficulty setting
			if(_map_owner[tile] == OWNER_TOWN && _game_mode != GM_EDITOR) {
				if (!CheckforTownRating(tile, flags, t, ROAD_REMOVE))
					return CMD_ERROR;
			}

			if (flags & DC_EXEC) {
				// checks if the owner is town than decrease town rating by 50 until you have
				// a "Poor" town rating
				if(_map_owner[tile] == OWNER_TOWN && _game_mode != GM_EDITOR)
					ChangeTownRating(t, -_road_remove_cost[(byte)edge_road], RATING_ROAD_MINIMUM);

				_map5[tile] ^= c;
				if ((_map5[tile]&0xF) == 0)
					DoClearSquare(tile);
				else
					MarkTileDirtyByTile(tile);

			}
			return cost;
		} else if (!(ti.map5 & 0xE0)) {
			byte c;

			if (!(ti.map5 & 8)) {
				c = 2;
				if (p1 & 5) goto return_error;
			} else {
				c = 1;
				if (p1 & 10) goto return_error;
			}

			cost = _price.remove_road * 2;
			if (flags & DC_EXEC) {
				ModifyTile(tile,
					MP_SETTYPE(MP_RAILWAY) |
					MP_MAP2_CLEAR | MP_MAP3LO | MP_MAP3HI_CLEAR | MP_MAP5,
					_map3_hi[tile] & 0xF, /* map3_lo */
					c											/* map5 */
				);
			}
			return cost;
		} else
			goto return_error;

	} else {
return_error:;
		return_cmd_error(INVALID_STRING_ID);
	}
}


enum {
	ROAD_NW = 1, // NW road track
	ROAD_SW = 2, // SW road track
	ROAD_SE = 4, // SE road track
	ROAD_NE = 8, // NE road track
	ROAD_ALL = (ROAD_NW | ROAD_SW | ROAD_SE | ROAD_NE)
};

static const byte _valid_tileh_slopes_road[3][15] = {
	// set of normal ones
	{
		ROAD_ALL, 0, 0,
		ROAD_SW | ROAD_NE, 0, 0,  // 3, 4, 5
		ROAD_NW | ROAD_SE, 0, 0,
		ROAD_NW | ROAD_SE, 0, 0,  // 9, 10, 11
		ROAD_SW | ROAD_NE, 0, 0
	},
	// allowed road for an evenly raised platform
	{
		0,
		ROAD_SW | ROAD_NW,
		ROAD_SW | ROAD_SE,
		ROAD_NW | ROAD_SE | ROAD_SW,

		ROAD_SE | ROAD_NE, // 4
		ROAD_ALL,
		ROAD_SW | ROAD_NE | ROAD_SE,
		ROAD_ALL,

		ROAD_NW | ROAD_NE, // 8
		ROAD_SW | ROAD_NE | ROAD_NW,
		ROAD_ALL,
		ROAD_ALL,

		ROAD_NW | ROAD_SE | ROAD_NE, // 12
		ROAD_ALL,
		ROAD_ALL
	},
	// valid railway crossings on slopes
	{
		1, 0, 0, // 0, 1, 2
		0, 0, 1, // 3, 4, 5
		0, 1, 0, // 6, 7, 8
		0, 1, 1, // 9, 10, 11
		0, 1, 1, // 12, 13, 14
	}
};


static uint32 CheckRoadSlope(int tileh, byte *pieces, byte existing)
{
	if (!(tileh & 0x10)) {
		byte road_bits = *pieces | existing;

		// no special foundation
		if ((~_valid_tileh_slopes_road[0][tileh] & road_bits) == 0) {
			// force that all bits are set when we have slopes
			if (tileh != 0) *pieces |= _valid_tileh_slopes_road[0][tileh];
			return 0; // no extra cost
		}

		// foundation is used. Whole tile is leveled up
		if ((~_valid_tileh_slopes_road[1][tileh] & road_bits) == 0) {
			return existing ? 0 : _price.terraform;
		}

		// partly leveled up tile, only if there's no road on that tile
		if ( !existing && (tileh == 1 || tileh == 2 || tileh == 4 || tileh == 8) ) {
			// force full pieces.
			*pieces |= (*pieces & 0xC) >> 2;
			*pieces |= (*pieces & 0x3) << 2;
			return (*pieces == (ROAD_NE|ROAD_SW) || *pieces == (ROAD_SE|ROAD_NW)) ? _price.terraform : CMD_ERROR;
		}
	}
	return CMD_ERROR;
}

/* Build a piece of road
 * p1 = piece flags
 */

int32 CmdBuildRoad(int x, int y, uint32 flags, uint32 p1, uint32 p2)
{
	TileInfo ti;
	int32 cost;
	byte pieces = (byte)p1, existing = 0;
	uint tile;

	SET_EXPENSES_TYPE(EXPENSES_CONSTRUCTION);

	FindLandscapeHeight(&ti, x, y);
	tile = ti.tile;

	// allow building road under bridge
	if (ti.type != MP_TUNNELBRIDGE && !EnsureNoVehicle(tile))
		return CMD_ERROR;

	if (ti.type == MP_STREET) {
		if (!(ti.map5 & 0xF0)) {
			if ( ((pieces) & (byte)(ti.map5)) == (pieces))
				return_cmd_error(STR_1007_ALREADY_BUILT);
			existing = ti.map5;
		} else {
			if (!(ti.map5 & 0xE0) && pieces != ((ti.map5 & 8) ? 5 : 10))
				return_cmd_error(STR_1007_ALREADY_BUILT);
			goto do_clear;
		}
	} else if (ti.type == MP_RAILWAY) {
		byte m5;

		if (ti.tileh & 0x10) // very steep tile
				return_cmd_error(STR_1000_LAND_SLOPED_IN_WRONG_DIRECTION);

		if(!_valid_tileh_slopes_road[2][ti.tileh]) // prevent certain slopes
				return_cmd_error(STR_1000_LAND_SLOPED_IN_WRONG_DIRECTION);

		if (ti.map5 == 2) {
			if (pieces & 5) goto do_clear;
			m5 = 0x10;
		} else if (ti.map5 == 1) {
			if (pieces & 10) goto do_clear;
			m5 = 0x18;
		} else
			goto do_clear;

		if (flags & DC_EXEC) {
			ModifyTile(tile,
				MP_SETTYPE(MP_STREET) |
				MP_MAP2_CLEAR | MP_MAP3LO | MP_MAP3HI | MP_MAP5,
				_current_player, /* map3_lo */
				_map3_lo[tile] & 0xF, /* map3_hi */
				m5 /* map5 */
			);
		}
		return _price.build_road * 2;
	} else if (ti.type == MP_TUNNELBRIDGE) {

		/* check for flat land */
		if (ti.tileh & 0x10) // very steep tile
				return_cmd_error(STR_1000_LAND_SLOPED_IN_WRONG_DIRECTION);

		/* is this middle part of a bridge? */
		if ((ti.map5 & 0xC0) != 0xC0)
				goto do_clear;

		/* only allow roads pertendicular to bridge */
		if ((pieces & 5U) == (ti.map5 & 0x01U))
				goto do_clear;

		/* check if clear land under bridge */
		if ((ti.map5 & 0xF8) == 0xE8) 			/* road under bridge */
				return_cmd_error(STR_1007_ALREADY_BUILT);
		else if ((ti.map5 & 0xE0) == 0xE0) 	/* other transport route under bridge */
				return_cmd_error(STR_1008_MUST_REMOVE_RAILROAD_TRACK);
		else if ((ti.map5 & 0xF8) == 0xC8) 	/* water under bridge */
				return_cmd_error(STR_3807_CAN_T_BUILD_ON_WATER);

		/* all checked, can build road now! */
		cost = _price.build_road * 2;
		if (flags & DC_EXEC) {
			ModifyTile(tile,
				MP_MAPOWNER_CURRENT | MP_MAP5,
				(ti.map5 & 0xC7) | 0x28 // map5
			);
		}
		return cost;
	} else {
do_clear:;
		if (DoCommandByTile(tile, 0, 0, flags & ~DC_EXEC, CMD_LANDSCAPE_CLEAR) == CMD_ERROR)
			return CMD_ERROR;
	}

	cost = CheckRoadSlope(ti.tileh, &pieces, existing);
	if (cost == CMD_ERROR) return_cmd_error(STR_1800_LAND_SLOPED_IN_WRONG_DIRECTION);

	if (cost && (!_patches.build_on_slopes || (!_patches.ainew_active && _is_ai_player)))
		return CMD_ERROR;

	if (!(ti.type == MP_STREET && (ti.map5 & 0xF0) == 0)) {
		cost += DoCommandByTile(tile, 0, 0, flags, CMD_LANDSCAPE_CLEAR);
	} else {
		// Don't put the pieces that already exist
		pieces &= ~ti.map5;
	}

	{
		byte t = pieces;
		while (t) {
			if (t & 1) cost += _price.build_road;
			t >>= 1;
		}
	}

	if (flags & DC_EXEC) {
		if (ti.type != MP_STREET) {
			_map_type_and_height[tile] &= 0xF;
			_map_type_and_height[tile] |= MP_STREET << 4;
			_map5[tile] = 0;
			_map_owner[tile] = _current_player;
		}

		_map5[tile] |= (byte)pieces;

		MarkTileDirtyByTile(tile);
	}
	return cost;
}

int32 DoConvertStreetRail(uint tile, uint totype, bool exec)
{
	// not a railroad crossing?
	if ((_map5[tile] & 0xF0) != 0x10) return CMD_ERROR;

	// not owned by me?
	if (!CheckTileOwnership(tile) || !EnsureNoVehicle(tile)) return CMD_ERROR;

	// tile is already of requested type?
	if ( (uint)(_map3_hi[tile] & 0xF) == totype) return CMD_ERROR;

	if (exec) {
		// change type.
		_map3_hi[tile] = (_map3_hi[tile] & 0xF0) + totype;
		MarkTileDirtyByTile(tile);
	}

	return _price.build_rail >> 1;
}


// Build a long piece of road.
// x,y = end tile
// p1 = start tile
// p2&1 = start tile starts in the 2nd half
// p2&2 = end tile starts in the 2nd half
// p2&4 = direction (0 = along x, 1=along y)
int32 CmdBuildLongRoad(int x, int y, uint32 flags, uint32 p1, uint32 p2)
{
	uint start_tile, end_tile, tile;
	int mode;
	int32 cost,ret;

	SET_EXPENSES_TYPE(EXPENSES_CONSTRUCTION);

	start_tile = p1;
	end_tile = TILE_FROM_XY(x, y);

	if (start_tile > end_tile || (start_tile == end_tile && (p2&1))) {
		uint t = start_tile; start_tile = end_tile; end_tile = t;
		p2 ^= IS_INT_INSIDE(p2&3, 1, 3) ? 3 : 0;
	}

	cost = 0;
	tile = start_tile;
	// Start tile is the small number.
	for(;;) {
		mode = (p2&4) ? 5 : 10;

		if (tile == start_tile && (p2&1))
			mode &= (4+2);
		else if (tile == end_tile && !(p2&2))
			mode &= (1+8);

		ret = DoCommandByTile(tile, mode, 0, flags, CMD_BUILD_ROAD);
		if (ret == CMD_ERROR) {
			if (_error_message != STR_1007_ALREADY_BUILT)
				return CMD_ERROR;
		} else {
			cost += ret;
		}

		if (tile == end_tile)
			break;

		tile += (p2&4)?TILE_XY(0,1):TILE_XY(1,0);
	}

	// already built?
	if (cost == 0)
		return CMD_ERROR;

	return cost;
}

// Remove a long piece of road.
// x,y = end tile
// p1 = start tile
// p2&1 = start tile starts in the 2nd half
// p2&2 = end tile starts in the 2nd half
// p2&4 = direction (0 = along x, 1=along y)
int32 CmdRemoveLongRoad(int x, int y, uint32 flags, uint32 p1, uint32 p2)
{
	uint start_tile, end_tile, tile;
	int32 cost,ret;

	SET_EXPENSES_TYPE(EXPENSES_CONSTRUCTION);

	start_tile = p1;
	end_tile = TILE_FROM_XY(x, y);

	if (start_tile > end_tile || (start_tile == end_tile && (p2&1))) {
		uint t = start_tile; start_tile = end_tile; end_tile = t;
		p2 ^= IS_INT_INSIDE(p2&3, 1, 3) ? 3 : 0;
	}

	cost = 0;
	tile = start_tile;
	// Start tile is the small number.
	for(;;) {
		uint bits = (p2 & 4) ? ROAD_SE | ROAD_NW : ROAD_SW | ROAD_NE;
		if (tile == end_tile && !(p2&2)) bits &= ROAD_NW | ROAD_NE;
		if (tile == start_tile && (p2&1)) bits &= ROAD_SE | ROAD_SW;

		// try to remove the halves.
		if (bits) {
			ret = DoCommandByTile(tile, bits, 0, flags, CMD_REMOVE_ROAD);
			if (ret != CMD_ERROR)
				cost += ret;
		}

		if (tile == end_tile)
			break;

		tile += (p2&4)?TILE_XY(0,1):TILE_XY(1,0);
	}

	// already built?
	if (cost == 0)
		return CMD_ERROR;

	return cost;
}

/* Build a road depot
 * p1 - direction (0-3)
 * p2 - unused
 */

int32 CmdBuildRoadDepot(int x, int y, uint32 flags, uint32 p1, uint32 p2)
{
	TileInfo ti;
	int32 cost;
	Depot *dep;
	uint tile;

	SET_EXPENSES_TYPE(EXPENSES_CONSTRUCTION);

	FindLandscapeHeight(&ti, x, y);

	tile = ti.tile;

	if (!EnsureNoVehicle(tile))
		return CMD_ERROR;

	if (ti.tileh != 0) {
		if (!_patches.build_on_slopes || (ti.tileh & 0x10 || !((0x4C >> p1) & ti.tileh) ))
			return_cmd_error(STR_0007_FLAT_LAND_REQUIRED);
	}

	cost = DoCommandByTile(tile, 0, 0, flags, CMD_LANDSCAPE_CLEAR);
	if (cost == CMD_ERROR)
		return CMD_ERROR;

	dep = AllocateDepot();
	if (dep == NULL)
		return CMD_ERROR;

	if (flags & DC_EXEC) {
		if (_current_player == _local_player)
			_last_built_road_depot_tile = (TileIndex)tile;

		dep->xy = tile;
		dep->town_index = ClosestTownFromTile(tile, (uint)-1)->index;

		ModifyTile(tile,
			MP_SETTYPE(MP_STREET) |
			MP_MAPOWNER_CURRENT | MP_MAP5,
			(p1 | 0x20) /* map5 */
		);

	}
	return cost + _price.build_road_depot;
}

static int32 RemoveRoadDepot(uint tile, uint32 flags)
{
	if (!CheckTileOwnership(tile) && _current_player != OWNER_WATER)
		return CMD_ERROR;

	if (!EnsureNoVehicle(tile))
		return CMD_ERROR;

	if (flags & DC_EXEC) {
		DoDeleteDepot(tile);
	}

	return _price.remove_road_depot;
}

#define M(x) (1<<(x))

static int32 ClearTile_Road(uint tile, byte flags) {
	int32 ret;
	byte m5 = _map5[tile];

	if ( (m5 & 0xF0) == 0) {
		byte b = m5 & 0xF;

		if (! ((1 << b) & (M(1)|M(2)|M(4)|M(8))) ) {
			if ( (!(flags & DC_AI_BUILDING) || _map_owner[tile]!=OWNER_TOWN) && flags&DC_AUTO)
				return_cmd_error(STR_1801_MUST_REMOVE_ROAD_FIRST);
		}
		return DoCommandByTile(tile, b, 0, flags, CMD_REMOVE_ROAD);
	} else if ( (m5 & 0xE0) == 0) {
		if (flags & DC_AUTO)
			return_cmd_error(STR_1801_MUST_REMOVE_ROAD_FIRST);

		ret = DoCommandByTile(tile, (m5&8)?5:10, 0, flags, CMD_REMOVE_ROAD);
		if (ret == CMD_ERROR)
			return CMD_ERROR;

		if (flags & DC_EXEC) {
			DoCommandByTile(tile, 0, 0, flags, CMD_LANDSCAPE_CLEAR);
		}

		return ret;
	} else {
		if (flags & DC_AUTO)
			return_cmd_error(STR_2004_BUILDING_MUST_BE_DEMOLISHED);
		return RemoveRoadDepot(tile,flags);
	}
}


typedef struct DrawRoadTileStruct {
	uint16 image;
	byte subcoord_x;
	byte subcoord_y;
} DrawRoadTileStruct;

typedef struct DrawRoadSeqStruct {
	uint32 image;
	byte subcoord_x;
	byte subcoord_y;
	byte width;
	byte height;
} DrawRoadSeqStruct;

#include "table/road_land.h"


uint GetRoadFoundation(uint tileh, uint bits) {
	int i;
	// normal level sloped building
	if ((~_valid_tileh_slopes_road[1][tileh] & bits) == 0)
		return tileh;

	// inclined sloped building
	if ( ((i=0, tileh == 1) || (i+=2, tileh == 2) || (i+=2, tileh == 4) || (i+=2, tileh == 8)) &&
		((bits == (ROAD_SW | ROAD_NE)) || (i++, bits == (ROAD_NW | ROAD_SE))))
		return i + 15;

	// rail crossing
	if ((bits & 0x10) && _valid_tileh_slopes_road[2][tileh])
		return tileh;

	return 0;
}

const byte _road_sloped_sprites[14] = {
	0,  0,  2,  0,
	0,  1,  0,  0,
	3,  0,  0,  0,
	0,  0
};

static void DrawTile_Road(TileInfo *ti)
{
	uint32 image;
	uint16 m2;
	const byte *s;

	if ( (ti->map5 & 0xF0) == 0) { // if it is a road the upper 4 bits are 0
		const DrawRoadTileStruct *drts;

		if (ti->tileh != 0) {
			int f = GetRoadFoundation(ti->tileh, ti->map5 & 0xF);
			if (f) DrawFoundation(ti, f);

			// default sloped sprites..
			if (ti->tileh != 0) {
				image = _road_sloped_sprites[ti->tileh - 1] + 0x53F;
			} else  {
				image = _road_tile_sprites_1[ti->map5 & 0xF];
			}
		} else {
			image = _road_tile_sprites_1[ti->map5 & 0xF];
		}

		m2 = _map2[ti->tile] & 7;

		if (m2 == 0) image |= 0x3178000;

		if (_map3_hi[ti->tile] & 0x80) {
			image += 19;
		} else if (m2 > 1 && m2 != 6) {
			image -= 19; /* pavement along the road? */
		}

		DrawGroundSprite(image);

		if (!(_display_opt & DO_FULL_DETAIL) || _cur_dpi->zoom == 2)
			return;

		if (m2 >= 6) {
			// roadwork
			DrawGroundSprite(0x586 + ((ti->map5&8)!=0 ? 0 : 1));
			return;
		}

		drts = (const DrawRoadTileStruct*)_road_display_table[m2][ti->map5 & 0xF];

		while ((image = drts->image) != 0) {
			int x = ti->x | drts->subcoord_x;
			int y = ti->y | drts->subcoord_y;
			byte z = ti->z;
			if (ti->tileh != 0)	z = GetSlopeZ(x, y);
			AddSortableSpriteToDraw(image, x, y, 2, 2, 0x10, z);
			drts++;
		}
	} else if ( (ti->map5 & 0xE0) == 0) { // railroad crossing
		int f = GetRoadFoundation(ti->tileh, ti->map5 & 0xF);
		if (f) DrawFoundation(ti, f);

		image = 0x55B;

		if ( (ti->map5 & 8) != 0)
			image--;

		if ( (ti->map5 & 4) != 0)
			image += 2;

		if ( _map3_hi[ti->tile] & 0x80) {
			image += 8;
		} else {
			m2 = _map2[ti->tile] & 7;
			if (m2 == 0) image |= 0x3178000;
			if (m2 > 1) image += 4;
		}

		DrawGroundSprite(image + (_map3_hi[ti->tile] & 0xF) * 12);
	} else {
		uint32 ormod;
		int player;
		const DrawRoadSeqStruct *drss;

		if (ti->tileh != 0) { DrawFoundation(ti, ti->tileh); }

		ormod = 0x315;
		player = _map_owner[ti->tile];
		if (player < MAX_PLAYERS)
			ormod = PLAYER_SPRITE_COLOR(player);

		s = _road_display_datas[ti->map5 & 0xF];

		DrawGroundSprite(*(const uint32*)s);
		s += sizeof(uint32);
		drss = (const DrawRoadSeqStruct*)s;

		while ((image=drss->image) != 0) {
			if (image & 0x8000)
				image |= ormod;
			if (_display_opt & DO_TRANS_BUILDINGS) // show transparent depots
				image = (image & 0x3FFF) | 0x3224000;

			AddSortableSpriteToDraw(image, ti->x | drss->subcoord_x,
				ti->y | drss->subcoord_y, drss->width, drss->height, 0x14, ti->z);
			drss++;
		}
	}
}

void DrawRoadDepotSprite(int x, int y, int image)
{
	uint32 ormod;
	const DrawRoadSeqStruct *dtss;
	const byte *t;

	ormod = PLAYER_SPRITE_COLOR(_local_player);

	t = _road_display_datas[image];

	x+=33;
	y+=17;

	DrawSprite(*(const uint32*)t, x, y);
	t += sizeof(uint32);

	for(dtss = (const DrawRoadSeqStruct *)t; dtss->image != 0; dtss++) {
		Point pt = RemapCoords(dtss->subcoord_x, dtss->subcoord_y, 0);

		image = dtss->image;
		if (image & 0x8000)
			image |= ormod;

		DrawSprite(image, x + pt.x, y + pt.y);
	}
}

static uint GetSlopeZ_Road(TileInfo *ti)
{
	uint z = ti->z;
	int th = ti->tileh;

	// check if it's a foundation
	if (ti->tileh != 0) {
		if ((ti->map5 & 0xE0) == 0) { /* road or crossing */
			uint f = GetRoadFoundation(ti->tileh, ti->map5 & 0x3F);
			if (f != 0) {
				if (f < 15) {
					// leveled foundation
					return z + 8;
				}
				// inclined foundation
				th = _inclined_tileh[f - 15];
			}
		} else if ((ti->map5 & 0xF0) == 0x20) {
			// depot
			return z + 8;
		}
		return GetPartialZ(ti->x&0xF, ti->y&0xF, th) + z;
	}
	return z; // normal Z if no slope
}

uint GetSlopeTileh_Road(TileInfo *ti)
{
	// check if it's a foundation
	if (ti->tileh != 0) {
		if ((ti->map5 & 0xE0) == 0) { /* road or crossing */
			uint f = GetRoadFoundation(ti->tileh, ti->map5 & 0x3F);
			if (f != 0) {
				if (f < 15) {
					// leveled foundation
					return 0;
				}
				// inclined foundation
				return _inclined_tileh[f - 15];
			}
		} else if ((ti->map5 & 0xF0) == 0x20) {
			// depot
			return 0;
		}
	}
	return ti->tileh;
}

static void GetAcceptedCargo_Road(uint tile, AcceptedCargo ac)
{
	/* not used */
}

static void AnimateTile_Road(uint tile)
{
	if ((_map5[tile] & 0xF0) == 0x10) {
		MarkTileDirtyByTile(tile);
	}
}

static const byte _town_road_types[5][2] = {
	{1,1},
	{2,2},
	{2,2},
	{5,5},
	{3,2},
};

static const byte _town_road_types_2[5][2] = {
	{1,1},
	{2,2},
	{3,2},
	{3,2},
	{3,2},
};


static void TileLoop_Road(uint tile)
{
	Town *t;
	int grp;

	if (_opt.landscape == LT_HILLY) {
		// Fix snow style if the road is above the snowline
		if ((_map3_hi[tile] & 0x80) != ((GetTileZ(tile) > _opt.snow_line) ? 0x80 : 0x00)) {
			_map3_hi[tile] ^= 0x80;
			MarkTileDirtyByTile(tile);
		}
	} else if (_opt.landscape == LT_DESERT) {
		// Fix desert style
		if (GetMapExtraBits(tile) == 1 && !(_map3_hi[tile] & 0x80)) {
			_map3_hi[tile] |= 0x80;
			MarkTileDirtyByTile(tile);
		}
	}

	if (_map5[tile] & 0xE0)
		return;

	if ((_map2[tile] & 7) < 6) {
		t = ClosestTownFromTile(tile, (uint)-1);
		grp = 0;
		if (t != NULL) {
			// If in the scenario editor, set the owner to a town.
			if (_game_mode == GM_EDITOR) {
				_map_owner[tile] = OWNER_TOWN;
			}

			grp = GetTownRadiusGroup(t, tile);

			// Show an animation to indicate road work
			if (t->road_build_months != 0 &&
					!(GetTileDist(t->xy, tile) >= 8 && grp==0) &&
					(_map5[tile]==5 || _map5[tile]==10)) {
				if (GetTileSlope(tile, NULL) == 0 && EnsureNoVehicle(tile) && CHANCE16(1,20)) {
					_map2[tile] = ((_map2[tile]&7) <= 1) ? 6 : 7;

					SndPlayTileFx(SND_21_JACKHAMMER, tile);
					CreateEffectVehicleAbove(
						TileX(tile) * 16 + 7,
						TileY(tile) * 16 + 7,
						0,
						EV_ROADWORK);
					MarkTileDirtyByTile(tile);
					return;
				}
			}
		}

		{
			const byte *p = (_opt.landscape == LT_CANDY) ? _town_road_types_2[grp] : _town_road_types[grp];
			byte b = _map2[tile] & 7;

			if (b == p[0])
				return;

			if (b == p[1]) {
				b = p[0];
			} else if (b == 0) {
				b = p[1];
			} else {
				b = 0;
			}
			_map2[tile] = (_map2[tile] & ~7) | b;
			MarkTileDirtyByTile(tile);
		}
	} else {
		// Handle road work

		uint16 b = _map2[tile];
		if (b < 0x80) {
			_map2[tile] = b + 8;
			return;
		}
		_map2[tile] = ((b&7) == 6) ? 1 : 2;
		MarkTileDirtyByTile(tile);
	}
}

void ShowRoadDepotWindow(uint tile);

static void ClickTile_Road(uint tile)
{
	if ((_map5[tile] & 0xF0) == 0x20) {
		ShowRoadDepotWindow(tile);
	}
}

static const byte _road_trackbits[16] = {
	0x0, 0x0, 0x0, 0x10, 0x0, 0x2, 0x8, 0x1A, 0x0, 0x4, 0x1, 0x15, 0x20, 0x26, 0x29, 0x3F,
};

static uint32 GetTileTrackStatus_Road(uint tile, TransportType mode)	{
	if (mode == TRANSPORT_RAIL) {
		if ((_map5[tile] & 0xF0) != 0x10)
			return 0;
		return _map5[tile] & 8 ? 0x101 : 0x202;
	} else if  (mode == TRANSPORT_ROAD) {
		byte b = _map5[tile];
		if ((b & 0xF0) == 0) {
			/* Ordinary road */
			if (!_road_special_gettrackstatus && (_map2[tile]&7) >= 6)
				return 0;
			return _road_trackbits[b&0xF] * 0x101;
		} else if ((b&0xF0) == 0x10) {
			/* Crossing */
			uint32 r = 0x101;
			if (b&8) r <<= 1;

			if (b&4) {
				r *= 0x10001;
			}
			return r;
		}
	}
	return 0;
}

static const StringID _road_tile_strings[] = {
	STR_1818_ROAD_RAIL_LEVEL_CROSSING,
	STR_1817_ROAD_VEHICLE_DEPOT,

	STR_1814_ROAD,
	STR_1814_ROAD,
	STR_1814_ROAD,
	STR_1815_ROAD_WITH_STREETLIGHTS,
	STR_1814_ROAD,
	STR_1816_TREE_LINED_ROAD,
	STR_1814_ROAD,
	STR_1814_ROAD,
};

static void GetTileDesc_Road(uint tile, TileDesc *td)
{
	int i = (_map5[tile] >> 4);
	if (i == 0)
		i = (_map2[tile] & 7) + 3;
	td->str = _road_tile_strings[i - 1];
	td->owner = _map_owner[tile];
}

static const byte _roadveh_enter_depot_unk0[4] = {
	8, 9, 0, 1
};

static uint32 VehicleEnter_Road(Vehicle *v, uint tile, int x, int y)
{
	if ((_map5[tile] & 0xF0) == 0x10)	{
		if (v->type == VEH_Train && (_map5[tile] & 4) == 0) {
			/* train crossing a road */
			SndPlayVehicleFx(SND_0E_LEVEL_CROSSING, v);
			_map5[tile] |= 4;
			MarkTileDirtyByTile(tile);
		}
	} else if ((_map5[tile]&0xF0) ==  0x20){
		if (v->type == VEH_Road && v->u.road.frame == 11) {
			if (_roadveh_enter_depot_unk0[_map5[tile]&3] == v->u.road.state) {
				RoadVehEnterDepot(v);
				return 4;
			}
		}
	}
	return 0;
}

static void VehicleLeave_Road(Vehicle *v, uint tile, int x, int y)
{
	if ((_map5[tile] & 0xF0) == 0x10 && v->type == VEH_Train && v->next == NULL) {
		_map5[tile] &= ~4;
		MarkTileDirtyByTile(tile);
	}
}

static void ChangeTileOwner_Road(uint tile, byte old_player, byte new_player)
{
	byte b;

	// road/rail crossing where the road is owned by the current player?
	if (old_player == _map3_lo[tile] && (_map5[tile]&0xF0) == 0x10) {
		_map3_lo[tile] = (new_player == 0xFF) ? OWNER_NONE : new_player;
	}

	if (_map_owner[tile] != old_player)
		return;

	if (new_player != 255) {
		_map_owner[tile] = new_player;
	}	else {
		b = _map5[tile]&0xF0;
		if (b == 0) {
			_map_owner[tile] = OWNER_NONE;
		} else if (b == 0x10) {
			_map5[tile] = (_map5[tile]&8) ? 0x5 : 0xA;
			_map_owner[tile] = _map3_lo[tile];
			_map3_lo[tile] = 0;
			_map3_hi[tile] &= 0x80;
		} else {
			DoCommandByTile(tile, 0, 0, DC_EXEC, CMD_LANDSCAPE_CLEAR);
		}
	}
}

void InitializeRoad()
{
	_last_built_road_depot_tile = 0;
}

const TileTypeProcs _tile_type_road_procs = {
	DrawTile_Road,						/* draw_tile_proc */
	GetSlopeZ_Road,						/* get_slope_z_proc */
	ClearTile_Road,						/* clear_tile_proc */
	GetAcceptedCargo_Road,		/* get_accepted_cargo_proc */
	GetTileDesc_Road,					/* get_tile_desc_proc */
	GetTileTrackStatus_Road,	/* get_tile_track_status_proc */
	ClickTile_Road,						/* click_tile_proc */
	AnimateTile_Road,					/* animate_tile_proc */
	TileLoop_Road,						/* tile_loop_clear */
	ChangeTileOwner_Road,			/* change_tile_owner_clear */
	NULL,											/* get_produced_cargo_proc */
	VehicleEnter_Road,				/* vehicle_enter_tile_proc */
	VehicleLeave_Road,				/* vehicle_leave_tile_proc */
	GetSlopeTileh_Road,				/* get_slope_tileh_proc */
};