summaryrefslogtreecommitdiff
path: root/src/water_cmd.cpp
blob: 3ad2b235fa4986189004b8e698584c6cbbdd28c9 (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
/* $Id$ */

/** @file water_cmd.cpp Handling of water tiles. */

#include "stdafx.h"
#include "openttd.h"
#include "bridge_map.h"
#include "bridge.h"
#include "cmd_helper.h"
#include "station_map.h"
#include "tile_cmd.h"
#include "landscape.h"
#include "viewport_func.h"
#include "command_func.h"
#include "town.h"
#include "news_func.h"
#include "depot_base.h"
#include "depot_func.h"
#include "vehicle_gui.h"
#include "train.h"
#include "roadveh.h"
#include "water.h"
#include "water_map.h"
#include "industry_map.h"
#include "newgrf.h"
#include "newgrf_canal.h"
#include "transparency.h"
#include "strings_func.h"
#include "functions.h"
#include "window_func.h"
#include "vehicle_func.h"
#include "sound_func.h"
#include "variables.h"
#include "player_func.h"
#include "settings_type.h"
#include "clear_map.h"
#include "tree_map.h"
#include "station_base.h"
#include "airport.h"
#include "newgrf_cargo.h"
#include "effectvehicle_func.h"
#include "oldpool_func.h"
#include "tunnelbridge_map.h"

#include "table/sprites.h"
#include "table/strings.h"

/**
 * Describes the behaviour of a tile during flooding.
 */
enum FloodingBehaviour {
	FLOOD_NONE,    ///< The tile does not flood neighboured tiles.
	FLOOD_ACTIVE,  ///< The tile floods neighboured tiles.
	FLOOD_PASSIVE, ///< The tile does not actively flood neighboured tiles, but it prevents them from drying up.
	FLOOD_DRYUP,   ///< The tile drys up if it is not constantly flooded from neighboured tiles.
};

/**
 * Describes from which directions a specific slope can be flooded (if the tile is floodable at all).
 */
static const uint8 _flood_from_dirs[] = {
	(1 << DIR_NW) | (1 << DIR_SW) | (1 << DIR_SE) | (1 << DIR_NE), // SLOPE_FLAT
	(1 << DIR_NE) | (1 << DIR_SE),                                 // SLOPE_W
	(1 << DIR_NW) | (1 << DIR_NE),                                 // SLOPE_S
	(1 << DIR_NE),                                                 // SLOPE_SW
	(1 << DIR_NW) | (1 << DIR_SW),                                 // SLOPE_E
	0,                                                             // SLOPE_EW
	(1 << DIR_NW),                                                 // SLOPE_SE
	(1 << DIR_N ) | (1 << DIR_NW) | (1 << DIR_NE),                 // SLOPE_WSE, SLOPE_STEEP_S
	(1 << DIR_SW) | (1 << DIR_SE),                                 // SLOPE_N
	(1 << DIR_SE),                                                 // SLOPE_NW
	0,                                                             // SLOPE_NS
	(1 << DIR_E ) | (1 << DIR_NE) | (1 << DIR_SE),                 // SLOPE_NWS, SLOPE_STEEP_W
	(1 << DIR_SW),                                                 // SLOPE_NE
	(1 << DIR_S ) | (1 << DIR_SW) | (1 << DIR_SE),                 // SLOPE_ENW, SLOPE_STEEP_N
	(1 << DIR_W ) | (1 << DIR_SW) | (1 << DIR_NW),                 // SLOPE_SEN, SLOPE_STEEP_E
};

/**
 * Marks tile dirty if it is a canal or river tile.
 * Called to avoid glitches when flooding tiles next to canal tile.
 *
 * @param tile tile to check
 */
static inline void MarkTileDirtyIfCanalOrRiver(TileIndex tile)
{
	if (IsTileType(tile, MP_WATER) && (IsCanal(tile) || IsRiver(tile))) MarkTileDirtyByTile(tile);
}

/**
 * Marks the tiles around a tile as dirty, if they are canals or rivers.
 *
 * @param tile The center of the tile where all other tiles are marked as dirty
 * @ingroup dirty
 */
static void MarkCanalsAndRiversAroundDirty(TileIndex tile)
{
	for (Direction dir = DIR_BEGIN; dir < DIR_END; dir++) {
		MarkTileDirtyIfCanalOrRiver(tile + TileOffsByDir(dir));
	}
}

/**
 * Makes a tile canal or water depending on the surroundings.
 *
 * Must only be used for converting old savegames. Use WaterClass now.
 *
 * This as for example docks and shipdepots do not store
 * whether the tile used to be canal or 'normal' water.
 * @param t the tile to change.
 * @param o the owner of the new tile.
 * @param include_invalid_water_class Also consider WATER_CLASS_INVALID, i.e. industry tiles on land
 */
void SetWaterClassDependingOnSurroundings(TileIndex t, bool include_invalid_water_class)
{
	/* If the slope is not flat, we always assume 'land' (if allowed). Also for one-corner-raised-shores.
	 * Note: Wrt. autosloping under industry tiles this is the most fool-proof behaviour. */
	if (GetTileSlope(t, NULL) != SLOPE_FLAT) {
		if (include_invalid_water_class) {
			SetWaterClass(t, WATER_CLASS_INVALID);
			return;
		} else {
			NOT_REACHED();
		}
	}

	/* Mark tile dirty in all cases */
	MarkTileDirtyByTile(t);

	if (TileX(t) == 0 || TileY(t) == 0 || TileX(t) == MapMaxX() - 1 || TileY(t) == MapMaxY() - 1) {
		/* tiles at map borders are always WATER_CLASS_SEA */
		SetWaterClass(t, WATER_CLASS_SEA);
		return;
	}

	bool has_water = false;
	bool has_canal = false;
	bool has_river = false;

	for (DiagDirection dir = DIAGDIR_BEGIN; dir < DIAGDIR_END; dir++) {
		TileIndex neighbour = TileAddByDiagDir(t, dir);
		switch (GetTileType(neighbour)) {
			case MP_WATER:
				/* clear water and shipdepots have already a WaterClass associated */
				if (IsCoast(neighbour)) {
					has_water = true;
				} else if (!IsLock(neighbour)) {
					switch (GetWaterClass(neighbour)) {
						case WATER_CLASS_SEA:   has_water = true; break;
						case WATER_CLASS_CANAL: has_canal = true; break;
						case WATER_CLASS_RIVER: has_river = true; break;
						default: NOT_REACHED();
					}
				}
				break;

			case MP_RAILWAY:
				/* Shore or flooded halftile */
				has_water |= (GetRailGroundType(neighbour) == RAIL_GROUND_WATER);
				break;

			case MP_TREES:
				/* trees on shore */
				has_water |= (GetTreeGround(neighbour) == TREE_GROUND_SHORE);
				break;

			default: break;
		}
	}

	if (!has_water && !has_canal && !has_river && include_invalid_water_class) {
		SetWaterClass(t, WATER_CLASS_INVALID);
		return;
	}

	if (has_river && !has_canal) {
		SetWaterClass(t, WATER_CLASS_RIVER);
	} else if (has_canal || !has_water) {
		SetWaterClass(t, WATER_CLASS_CANAL);
	} else {
		SetWaterClass(t, WATER_CLASS_SEA);
	}
}


/** Build a ship depot.
 * @param tile tile where ship depot is built
 * @param flags type of operation
 * @param p1 bit 0 depot orientation (Axis)
 * @param p2 unused
 */
CommandCost CmdBuildShipDepot(TileIndex tile, uint32 flags, uint32 p1, uint32 p2)
{
	TileIndex tile2;

	CommandCost ret;

	Axis axis = Extract<Axis, 0>(p1);

	tile2 = tile + (axis == AXIS_X ? TileDiffXY(1, 0) : TileDiffXY(0, 1));

	if (!IsWaterTile(tile) || !IsWaterTile(tile2)) {
		return_cmd_error(STR_3801_MUST_BE_BUILT_ON_WATER);
	}

	if (IsBridgeAbove(tile) || IsBridgeAbove(tile2)) return_cmd_error(STR_5007_MUST_DEMOLISH_BRIDGE_FIRST);

	if (GetTileSlope(tile, NULL) != SLOPE_FLAT || GetTileSlope(tile2, NULL) != SLOPE_FLAT) {
		/* Prevent depots on rapids */
		return_cmd_error(STR_0239_SITE_UNSUITABLE);
	}

	WaterClass wc1 = GetWaterClass(tile);
	WaterClass wc2 = GetWaterClass(tile2);
	ret = DoCommand(tile, 0, 0, flags, CMD_LANDSCAPE_CLEAR);
	if (CmdFailed(ret)) return CMD_ERROR;
	ret = DoCommand(tile2, 0, 0, flags, CMD_LANDSCAPE_CLEAR);
	if (CmdFailed(ret)) return CMD_ERROR;

	if (!Depot::CanAllocateItem()) return CMD_ERROR;

	if (flags & DC_EXEC) {
		Depot *depot = new Depot(tile);
		depot->town_index = ClosestTownFromTile(tile, (uint)-1)->index;

		MakeShipDepot(tile,  _current_player, DEPOT_NORTH, axis, wc1);
		MakeShipDepot(tile2, _current_player, DEPOT_SOUTH, axis, wc2);
		MarkTileDirtyByTile(tile);
		MarkTileDirtyByTile(tile2);
	}

	return CommandCost(EXPENSES_CONSTRUCTION, _price.build_ship_depot);
}

void MakeWaterKeepingClass(TileIndex tile, Owner o)
{
	assert(IsTileType(tile, MP_WATER) || (IsTileType(tile, MP_STATION) && (IsBuoy(tile) || IsDock(tile) || IsOilRig(tile))) || IsTileType(tile, MP_INDUSTRY));

	WaterClass wc = GetWaterClass(tile);

	/* Autoslope might turn an originally canal or river tile into land */
	uint z;
	if (GetTileSlope(tile, &z) != SLOPE_FLAT) wc = WATER_CLASS_INVALID;

	if (wc == WATER_CLASS_SEA && z > 0) wc = WATER_CLASS_CANAL;

	switch (wc) {
		case WATER_CLASS_SEA:   MakeWater(tile);              break;
		case WATER_CLASS_CANAL: MakeCanal(tile, o, Random()); break;
		case WATER_CLASS_RIVER: MakeRiver(tile, Random());    break;
		default:                DoClearSquare(tile);          break;
	}
}

static CommandCost RemoveShipDepot(TileIndex tile, uint32 flags)
{
	if (!IsShipDepot(tile)) return CMD_ERROR;
	if (!CheckTileOwnership(tile)) return CMD_ERROR;

	TileIndex tile2 = GetOtherShipDepotTile(tile);

	/* do not check for ship on tile when company goes bankrupt */
	if (!(flags & DC_BANKRUPT)) {
		if (!EnsureNoVehicleOnGround(tile) || !EnsureNoVehicleOnGround(tile2)) return CMD_ERROR;
	}

	if (flags & DC_EXEC) {
		/* Kill the depot, which is registered at the northernmost tile. Use that one */
		delete GetDepotByTile(tile2 < tile ? tile2 : tile);

		MakeWaterKeepingClass(tile,  GetTileOwner(tile));
		MakeWaterKeepingClass(tile2, GetTileOwner(tile2));
		MarkTileDirtyByTile(tile);
		MarkTileDirtyByTile(tile2);
	}

	return CommandCost(EXPENSES_CONSTRUCTION, _price.remove_ship_depot);
}

/** build a shiplift */
static CommandCost DoBuildShiplift(TileIndex tile, DiagDirection dir, uint32 flags)
{
	CommandCost ret;
	int delta;

	/* middle tile */
	ret = DoCommand(tile, 0, 0, flags, CMD_LANDSCAPE_CLEAR);
	if (CmdFailed(ret)) return CMD_ERROR;

	delta = TileOffsByDiagDir(dir);
	/* lower tile */
	WaterClass wc_lower = IsWaterTile(tile - delta) ? GetWaterClass(tile - delta) : WATER_CLASS_CANAL;

	ret = DoCommand(tile - delta, 0, 0, flags, CMD_LANDSCAPE_CLEAR);
	if (CmdFailed(ret)) return CMD_ERROR;
	if (GetTileSlope(tile - delta, NULL) != SLOPE_FLAT) {
		return_cmd_error(STR_1000_LAND_SLOPED_IN_WRONG_DIRECTION);
	}

	/* upper tile */
	WaterClass wc_upper = IsWaterTile(tile + delta) ? GetWaterClass(tile + delta) : WATER_CLASS_CANAL;

	ret = DoCommand(tile + delta, 0, 0, flags, CMD_LANDSCAPE_CLEAR);
	if (CmdFailed(ret)) return CMD_ERROR;
	if (GetTileSlope(tile + delta, NULL) != SLOPE_FLAT) {
		return_cmd_error(STR_1000_LAND_SLOPED_IN_WRONG_DIRECTION);
	}

	if ((MayHaveBridgeAbove(tile) && IsBridgeAbove(tile)) ||
	    (MayHaveBridgeAbove(tile - delta) && IsBridgeAbove(tile - delta)) ||
	    (MayHaveBridgeAbove(tile + delta) && IsBridgeAbove(tile + delta))) {
		return_cmd_error(STR_5007_MUST_DEMOLISH_BRIDGE_FIRST);
	}

	if (flags & DC_EXEC) {
		MakeLock(tile, _current_player, dir, wc_lower, wc_upper);
		MarkTileDirtyByTile(tile);
		MarkTileDirtyByTile(tile - delta);
		MarkTileDirtyByTile(tile + delta);
		MarkCanalsAndRiversAroundDirty(tile - delta);
		MarkCanalsAndRiversAroundDirty(tile + delta);
	}

	return CommandCost(EXPENSES_CONSTRUCTION, _price.clear_water * 22 >> 3);
}

static CommandCost RemoveShiplift(TileIndex tile, uint32 flags)
{
	TileIndexDiff delta = TileOffsByDiagDir(GetLockDirection(tile));

	if (!CheckTileOwnership(tile) && GetTileOwner(tile) != OWNER_NONE) return CMD_ERROR;

	/* make sure no vehicle is on the tile. */
	if (!EnsureNoVehicleOnGround(tile) || !EnsureNoVehicleOnGround(tile + delta) || !EnsureNoVehicleOnGround(tile - delta))
		return CMD_ERROR;

	if (flags & DC_EXEC) {
		DoClearSquare(tile);
		MakeWaterKeepingClass(tile + delta, GetTileOwner(tile));
		MakeWaterKeepingClass(tile - delta, GetTileOwner(tile));
		MarkTileDirtyByTile(tile - delta);
		MarkTileDirtyByTile(tile + delta);
		MarkCanalsAndRiversAroundDirty(tile - delta);
		MarkCanalsAndRiversAroundDirty(tile + delta);
	}

	return CommandCost(EXPENSES_CONSTRUCTION, _price.clear_water * 2);
}

/** Builds a lock (ship-lift)
 * @param tile tile where to place the lock
 * @param flags type of operation
 * @param p1 unused
 * @param p2 unused
 */
CommandCost CmdBuildLock(TileIndex tile, uint32 flags, uint32 p1, uint32 p2)
{
	DiagDirection dir = GetInclinedSlopeDirection(GetTileSlope(tile, NULL));
	if (dir == INVALID_DIAGDIR) return_cmd_error(STR_1000_LAND_SLOPED_IN_WRONG_DIRECTION);

	/* Disallow building of locks on river rapids */
	if (IsWaterTile(tile)) return_cmd_error(STR_0239_SITE_UNSUITABLE);

	return DoBuildShiplift(tile, dir, flags);
}

/** Build a piece of canal.
 * @param tile end tile of stretch-dragging
 * @param flags type of operation
 * @param p1 start tile of stretch-dragging
 * @param p2 specifies canal (0), water (1) or river (2); last two can only be built in scenario editor
 */
CommandCost CmdBuildCanal(TileIndex tile, uint32 flags, uint32 p1, uint32 p2)
{
	CommandCost cost(EXPENSES_CONSTRUCTION);
	int size_x, size_y;
	int x;
	int y;
	int sx, sy;

	if (p1 >= MapSize()) return CMD_ERROR;

	/* Outside of the editor you can only build canals, not oceans */
	if (p2 != 0 && _game_mode != GM_EDITOR) return CMD_ERROR;

	x = TileX(tile);
	y = TileY(tile);
	sx = TileX(p1);
	sy = TileY(p1);

	if (x < sx) Swap(x, sx);
	if (y < sy) Swap(y, sy);
	size_x = (x - sx) + 1;
	size_y = (y - sy) + 1;

	/* Outside the editor you can only drag canals, and not areas */
	if (_game_mode != GM_EDITOR && (sx != x && sy != y)) return CMD_ERROR;

	BEGIN_TILE_LOOP(tile, size_x, size_y, TileXY(sx, sy)) {
		CommandCost ret;

		Slope slope = GetTileSlope(tile, NULL);
		if (slope != SLOPE_FLAT && (p2 != 2 || !IsInclinedSlope(slope))) {
			return_cmd_error(STR_0007_FLAT_LAND_REQUIRED);
		}

		/* can't make water of water! */
		if (IsTileType(tile, MP_WATER) && (!IsTileOwner(tile, OWNER_WATER) || p2 == 1)) continue;

		ret = DoCommand(tile, 0, 0, flags, CMD_LANDSCAPE_CLEAR);
		if (CmdFailed(ret)) return ret;
		cost.AddCost(ret);

		if (flags & DC_EXEC) {
			if (TileHeight(tile) == 0 && p2 == 1) {
				MakeWater(tile);
			} else if (p2 == 2) {
				MakeRiver(tile, Random());
			} else {
				MakeCanal(tile, _current_player, Random());
			}
			MarkTileDirtyByTile(tile);
			MarkCanalsAndRiversAroundDirty(tile);
		}

		cost.AddCost(_price.clear_water);
	} END_TILE_LOOP(tile, size_x, size_y, 0);

	if (cost.GetCost() == 0) {
		return_cmd_error(STR_1007_ALREADY_BUILT);
	} else {
		return cost;
	}
}

static CommandCost ClearTile_Water(TileIndex tile, byte flags)
{
	switch (GetWaterTileType(tile)) {
		case WATER_TILE_CLEAR:
			if (flags & DC_NO_WATER) return_cmd_error(STR_3807_CAN_T_BUILD_ON_WATER);

			/* Make sure it's not an edge tile. */
			if (!IsInsideMM(TileX(tile), 1, MapMaxX() - 1) ||
					!IsInsideMM(TileY(tile), 1, MapMaxY() - 1)) {
				return_cmd_error(STR_0002_TOO_CLOSE_TO_EDGE_OF_MAP);
			}

			/* Make sure no vehicle is on the tile */
			if (!EnsureNoVehicleOnGround(tile)) return CMD_ERROR;

			if (GetTileOwner(tile) != OWNER_WATER && GetTileOwner(tile) != OWNER_NONE && !CheckTileOwnership(tile)) return CMD_ERROR;

			if (flags & DC_EXEC) {
				DoClearSquare(tile);
				MarkCanalsAndRiversAroundDirty(tile);
			}
			return CommandCost(EXPENSES_CONSTRUCTION, _price.clear_water);

		case WATER_TILE_COAST: {
			Slope slope = GetTileSlope(tile, NULL);

			/* Make sure no vehicle is on the tile */
			if (!EnsureNoVehicleOnGround(tile)) return CMD_ERROR;

			if (flags & DC_EXEC) {
				DoClearSquare(tile);
				MarkCanalsAndRiversAroundDirty(tile);
			}
			if (IsSlopeWithOneCornerRaised(slope)) {
				return CommandCost(EXPENSES_CONSTRUCTION, _price.clear_water);
			} else {
				return CommandCost(EXPENSES_CONSTRUCTION, _price.clear_roughland);
			}
		}

		case WATER_TILE_LOCK: {
			static const TileIndexDiffC _shiplift_tomiddle_offs[] = {
				{ 0,  0}, {0,  0}, { 0, 0}, {0,  0}, // middle
				{-1,  0}, {0,  1}, { 1, 0}, {0, -1}, // lower
				{ 1,  0}, {0, -1}, {-1, 0}, {0,  1}, // upper
			};

			if (flags & DC_AUTO) return_cmd_error(STR_2004_BUILDING_MUST_BE_DEMOLISHED);
			if (_current_player == OWNER_WATER) return CMD_ERROR;
			/* move to the middle tile.. */
			return RemoveShiplift(tile + ToTileIndexDiff(_shiplift_tomiddle_offs[GetSection(tile)]), flags);
		}

		case WATER_TILE_DEPOT:
			if (flags & DC_AUTO) return_cmd_error(STR_2004_BUILDING_MUST_BE_DEMOLISHED);
			return RemoveShipDepot(tile, flags);

		default:
			NOT_REACHED();
	}
}

/**
 * return true if a tile is a water tile wrt. a certain direction.
 *
 * @param tile The tile of interest.
 * @param from The direction of interest.
 * @return true iff the tile is water in the view of 'from'.
 *
 */
static bool IsWateredTile(TileIndex tile, Direction from)
{
	switch (GetTileType(tile)) {
		case MP_WATER:
			switch (GetWaterTileType(tile)) {
				default: NOT_REACHED();
				case WATER_TILE_DEPOT: case WATER_TILE_CLEAR: return true;
				case WATER_TILE_LOCK: return DiagDirToAxis(GetLockDirection(tile)) == DiagDirToAxis(DirToDiagDir(from));

				case WATER_TILE_COAST:
					switch (GetTileSlope(tile, NULL)) {
						case SLOPE_W: return (from == DIR_SE) || (from == DIR_E) || (from == DIR_NE);
						case SLOPE_S: return (from == DIR_NE) || (from == DIR_N) || (from == DIR_NW);
						case SLOPE_E: return (from == DIR_NW) || (from == DIR_W) || (from == DIR_SW);
						case SLOPE_N: return (from == DIR_SW) || (from == DIR_S) || (from == DIR_SE);
						default: return false;
					}
			}

		case MP_RAILWAY:
			if (GetRailGroundType(tile) == RAIL_GROUND_WATER) {
				assert(IsPlainRailTile(tile));
				switch (GetTileSlope(tile, NULL)) {
					case SLOPE_W: return (from == DIR_SE) || (from == DIR_E) || (from == DIR_NE);
					case SLOPE_S: return (from == DIR_NE) || (from == DIR_N) || (from == DIR_NW);
					case SLOPE_E: return (from == DIR_NW) || (from == DIR_W) || (from == DIR_SW);
					case SLOPE_N: return (from == DIR_SW) || (from == DIR_S) || (from == DIR_SE);
					default: return false;
				}
			}
			return false;

		case MP_STATION:
			if (IsOilRig(tile)) {
				/* Do not draw waterborders inside of industries.
				 * Note: There is no easy way to detect the industry of an oilrig tile. */
				TileIndex src_tile = tile + TileOffsByDir(from);
				if ((IsTileType(src_tile, MP_STATION) && IsOilRig(src_tile)) ||
				    (IsTileType(src_tile, MP_INDUSTRY))) return true;

				return GetWaterClass(tile) != WATER_CLASS_INVALID;
			}
			return (IsDock(tile) && GetTileSlope(tile, NULL) == SLOPE_FLAT) || IsBuoy(tile);

		case MP_INDUSTRY: {
			/* Do not draw waterborders inside of industries.
			 * Note: There is no easy way to detect the industry of an oilrig tile. */
			TileIndex src_tile = tile + TileOffsByDir(from);
			if ((IsTileType(src_tile, MP_STATION) && IsOilRig(src_tile)) ||
			    (IsTileType(src_tile, MP_INDUSTRY) && GetIndustryIndex(src_tile) == GetIndustryIndex(tile))) return true;

			return IsIndustryTileOnWater(tile);
		}

		case MP_TUNNELBRIDGE: return GetTunnelBridgeTransportType(tile) == TRANSPORT_WATER && ReverseDiagDir(GetTunnelBridgeDirection(tile)) == DirToDiagDir(from);

		default:          return false;
	}
}

static void DrawWaterEdges(SpriteID base, TileIndex tile)
{
	uint wa;

	/* determine the edges around with water. */
	wa  = IsWateredTile(TILE_ADDXY(tile, -1,  0), DIR_SW) << 0;
	wa += IsWateredTile(TILE_ADDXY(tile,  0,  1), DIR_NW) << 1;
	wa += IsWateredTile(TILE_ADDXY(tile,  1,  0), DIR_NE) << 2;
	wa += IsWateredTile(TILE_ADDXY(tile,  0, -1), DIR_SE) << 3;

	if (!(wa & 1)) DrawGroundSprite(base,     PAL_NONE);
	if (!(wa & 2)) DrawGroundSprite(base + 1, PAL_NONE);
	if (!(wa & 4)) DrawGroundSprite(base + 2, PAL_NONE);
	if (!(wa & 8)) DrawGroundSprite(base + 3, PAL_NONE);

	/* right corner */
	switch (wa & 0x03) {
		case 0: DrawGroundSprite(base + 4, PAL_NONE); break;
		case 3: if (!IsWateredTile(TILE_ADDXY(tile, -1, 1), DIR_W)) DrawGroundSprite(base + 8, PAL_NONE); break;
	}

	/* bottom corner */
	switch (wa & 0x06) {
		case 0: DrawGroundSprite(base + 5, PAL_NONE); break;
		case 6: if (!IsWateredTile(TILE_ADDXY(tile, 1, 1), DIR_N)) DrawGroundSprite(base + 9, PAL_NONE); break;
	}

	/* left corner */
	switch (wa & 0x0C) {
		case  0: DrawGroundSprite(base + 6, PAL_NONE); break;
		case 12: if (!IsWateredTile(TILE_ADDXY(tile, 1, -1), DIR_E)) DrawGroundSprite(base + 10, PAL_NONE); break;
	}

	/* upper corner */
	switch (wa & 0x09) {
		case 0: DrawGroundSprite(base + 7, PAL_NONE); break;
		case 9: if (!IsWateredTile(TILE_ADDXY(tile, -1, -1), DIR_S)) DrawGroundSprite(base + 11, PAL_NONE); break;
	}
}

/** Draw a plain sea water tile with no edges */
static void DrawSeaWater(TileIndex tile)
{
	DrawGroundSprite(SPR_FLAT_WATER_TILE, PAL_NONE);
}

/** draw a canal styled water tile with dikes around */
static void DrawCanalWater(TileIndex tile)
{
	DrawGroundSprite(SPR_FLAT_WATER_TILE, PAL_NONE);

	/* Test for custom graphics, else use the default */
	SpriteID dikes_base = GetCanalSprite(CF_DIKES, tile);
	if (dikes_base == 0) dikes_base = SPR_CANAL_DIKES_BASE;

	DrawWaterEdges(dikes_base, tile);
}

struct LocksDrawTileStruct {
	int8 delta_x, delta_y, delta_z;
	byte width, height, depth;
	SpriteID image;
};

#include "table/water_land.h"

static void DrawWaterStuff(const TileInfo *ti, const WaterDrawTileStruct *wdts,
	SpriteID palette, uint base, bool draw_ground
)
{
	SpriteID image;
	SpriteID water_base = GetCanalSprite(CF_WATERSLOPE, ti->tile);
	SpriteID locks_base = GetCanalSprite(CF_LOCKS, ti->tile);

	/* If no custom graphics, use defaults */
	if (water_base == 0) water_base = SPR_CANALS_BASE;
	if (locks_base == 0) {
		locks_base = SPR_SHIPLIFT_BASE;
	} else {
		/* If using custom graphics, ignore the variation on height */
		base = 0;
	}

	image = wdts++->image;
	if (image < 4) image += water_base;
	if (draw_ground) DrawGroundSprite(image, PAL_NONE);

	/* End now if buildings are invisible */
	if (IsInvisibilitySet(TO_BUILDINGS)) return;

	for (; wdts->delta_x != 0x80; wdts++) {
		AddSortableSpriteToDraw(wdts->image + base + ((wdts->image < 24) ? locks_base : 0), palette,
			ti->x + wdts->delta_x, ti->y + wdts->delta_y,
			wdts->width, wdts->height,
			wdts->unk, ti->z + wdts->delta_z,
			IsTransparencySet(TO_BUILDINGS));
	}
}

static void DrawRiverWater(const TileInfo *ti)
{
	SpriteID image = SPR_FLAT_WATER_TILE;
	SpriteID edges_base = GetCanalSprite(CF_RIVER_EDGE, ti->tile);

	if (ti->tileh != SLOPE_FLAT) {
		image = GetCanalSprite(CF_RIVER_SLOPE, ti->tile);
		if (image == 0) {
			switch (ti->tileh) {
				case SLOPE_NW: image = SPR_WATER_SLOPE_Y_DOWN; break;
				case SLOPE_SW: image = SPR_WATER_SLOPE_X_UP;   break;
				case SLOPE_SE: image = SPR_WATER_SLOPE_Y_UP;   break;
				case SLOPE_NE: image = SPR_WATER_SLOPE_X_DOWN; break;
				default:       image = SPR_FLAT_WATER_TILE;    break;
			}
		} else {
			switch (ti->tileh) {
				default: NOT_REACHED();
				case SLOPE_SE:             edges_base += 12; break;
				case SLOPE_NE: image += 1; edges_base += 24; break;
				case SLOPE_SW: image += 2; edges_base += 36; break;
				case SLOPE_NW: image += 3; edges_base += 48; break;
			}
		}
	}

	DrawGroundSprite(image, PAL_NONE);

	/* Draw river edges if available. */
	if (edges_base > 48) DrawWaterEdges(edges_base, ti->tile);
}

void DrawShoreTile(Slope tileh)
{
	/* Converts the enum Slope into an offset based on SPR_SHORE_BASE.
	 * This allows to calculate the proper sprite to display for this Slope */
	static const byte tileh_to_shoresprite[32] = {
		0, 1, 2, 3, 4, 16, 6, 7, 8, 9, 17, 11, 12, 13, 14, 0,
		0, 0, 0, 0, 0,  0, 0, 0, 0, 0,  0,  5,  0, 10, 15, 0,
	};

	assert(!IsHalftileSlope(tileh)); // Halftile slopes need to get handled earlier.
	assert(tileh != SLOPE_FLAT);     // Shore is never flat

	assert((tileh != SLOPE_EW) && (tileh != SLOPE_NS)); // No suitable sprites for current flooding behaviour

	DrawGroundSprite(SPR_SHORE_BASE + tileh_to_shoresprite[tileh], PAL_NONE);
}

void DrawWaterClassGround(const TileInfo *ti) {
	switch (GetWaterClass(ti->tile)) {
		case WATER_CLASS_SEA:   DrawSeaWater(ti->tile); break;
		case WATER_CLASS_CANAL: DrawCanalWater(ti->tile); break;
		case WATER_CLASS_RIVER: DrawRiverWater(ti); break;
		default: NOT_REACHED();
	}
}

static void DrawTile_Water(TileInfo *ti)
{
	switch (GetWaterTileType(ti->tile)) {
		case WATER_TILE_CLEAR:
			DrawWaterClassGround(ti);
			DrawBridgeMiddle(ti);
			break;

		case WATER_TILE_COAST: {
			DrawShoreTile(ti->tileh);
			DrawBridgeMiddle(ti);
		} break;

		case WATER_TILE_LOCK: {
			const WaterDrawTileStruct *t = _shiplift_display_seq[GetSection(ti->tile)];
			DrawWaterStuff(ti, t, 0, ti->z > t[3].delta_y ? 24 : 0, true);
		} break;

		case WATER_TILE_DEPOT:
			DrawWaterClassGround(ti);
			DrawWaterStuff(ti, _shipdepot_display_seq[GetSection(ti->tile)], PLAYER_SPRITE_COLOR(GetTileOwner(ti->tile)), 0, false);
			break;
	}
}

void DrawShipDepotSprite(int x, int y, int image)
{
	const WaterDrawTileStruct *wdts = _shipdepot_display_seq[image];

	DrawSprite(wdts++->image, PAL_NONE, x, y);

	for (; wdts->delta_x != 0x80; wdts++) {
		Point pt = RemapCoords(wdts->delta_x, wdts->delta_y, wdts->delta_z);
		DrawSprite(wdts->image, PLAYER_SPRITE_COLOR(_local_player), x + pt.x, y + pt.y);
	}
}


static uint GetSlopeZ_Water(TileIndex tile, uint x, uint y)
{
	uint z;
	Slope tileh = GetTileSlope(tile, &z);

	return z + GetPartialZ(x & 0xF, y & 0xF, tileh);
}

static Foundation GetFoundation_Water(TileIndex tile, Slope tileh)
{
	return FOUNDATION_NONE;
}

static void GetAcceptedCargo_Water(TileIndex tile, AcceptedCargo ac)
{
	/* not used */
}

static void GetTileDesc_Water(TileIndex tile, TileDesc *td)
{
	switch (GetWaterTileType(tile)) {
		case WATER_TILE_CLEAR:
			switch (GetWaterClass(tile)) {
				case WATER_CLASS_SEA:   td->str = STR_3804_WATER;     break;
				case WATER_CLASS_CANAL: td->str = STR_LANDINFO_CANAL; break;
				case WATER_CLASS_RIVER: td->str = STR_LANDINFO_RIVER; break;
				default: assert(0); break;
			}
			break;
		case WATER_TILE_COAST: td->str = STR_3805_COAST_OR_RIVERBANK; break;
		case WATER_TILE_LOCK : td->str = STR_LANDINFO_LOCK;           break;
		case WATER_TILE_DEPOT: td->str = STR_3806_SHIP_DEPOT;         break;
		default: assert(0); break;
	}

	td->owner[0] = GetTileOwner(tile);
}

static void AnimateTile_Water(TileIndex tile)
{
	/* not used */
}


/**
 * Finds a vehicle to flood.
 * It does not find vehicles that are already crashed on bridges, i.e. flooded.
 * @param tile the tile where to find a vehicle to flood
 * @return a vehicle too flood or NULL when there is no vehicle too flood.
 */
static Vehicle *FindFloodableVehicleOnTile(TileIndex tile)
{
	if (IsTileType(tile, MP_STATION) && IsAirport(tile)) {
		const Station *st = GetStationByTile(tile);
		const AirportFTAClass *airport = st->Airport();
		for (uint x = 0; x < airport->size_x; x++) {
			for (uint y = 0; y < airport->size_y; y++) {
				tile = TILE_ADDXY(st->airport_tile, x, y);
				Vehicle *v = FindVehicleOnTileZ(tile, 1 + airport->delta_z);
				if (v != NULL && (v->vehstatus & VS_CRASHED) == 0) return v;
			}
		}

		/* No vehicle could be flooded on this airport anymore */
		return NULL;
	}

	/* if non-uniform stations are disabled, flood some train in this train station (if there is any) */
	if (!_settings_game.station.nonuniform_stations && IsTileType(tile, MP_STATION) && GetStationType(tile) == STATION_RAIL) {
		const Station *st = GetStationByTile(tile);

		BEGIN_TILE_LOOP(t, st->trainst_w, st->trainst_h, st->train_tile)
			if (st->TileBelongsToRailStation(t)) {
				Vehicle *v = FindVehicleOnTileZ(t, 0);
				if (v != NULL && (v->vehstatus & VS_CRASHED) == 0) return v;
			}
		END_TILE_LOOP(t, st->trainst_w, st->trainst_h, st->train_tile)

		return NULL;
	}

	if (!IsBridgeTile(tile)) return FindVehicleOnTileZ(tile, 0);

	TileIndex end = GetOtherBridgeEnd(tile);
	byte z = GetBridgeHeight(tile);
	Vehicle *v;

	/* check the start tile first since as this is closest to the water */
	v = FindVehicleOnTileZ(tile, z);
	if (v != NULL && (v->vehstatus & VS_CRASHED) == 0) return v;

	/* check a vehicle in between both bridge heads */
	v = FindVehicleBetween(tile, end, z, true);
	if (v != NULL) return v;

	/* check the end tile last to give fleeing vehicles a chance to escape */
	v = FindVehicleOnTileZ(end, z);
	return (v != NULL && (v->vehstatus & VS_CRASHED) == 0) ? v : NULL;
}

static void FloodVehicle(Vehicle *v)
{
	if (!(v->vehstatus & VS_CRASHED)) {
		uint16 pass = 0;

		if (v->type == VEH_TRAIN || v->type == VEH_ROAD || v->type == VEH_AIRCRAFT) {
			if (v->type == VEH_AIRCRAFT) {
				/* Crashing aircraft are always at z_pos == 1, never on z_pos == 0,
				 * because that's always the shadow. Except for the heliport, because
				 * that station has a big z_offset for the aircraft. */
				if (!IsTileType(v->tile, MP_STATION) || !IsAirport(v->tile) || GetTileMaxZ(v->tile) != 0) return;
				const Station *st = GetStationByTile(v->tile);
				const AirportFTAClass *airport = st->Airport();

				if (v->z_pos != airport->delta_z + 1) return;
			}

			if (v->type != VEH_AIRCRAFT) v = v->First();

			/* crash all wagons, and count passengers */
			for (Vehicle *u = v; u != NULL; u = u->Next()) {
				if (IsCargoInClass(u->cargo_type, CC_PASSENGERS)) pass += u->cargo.Count();
				u->vehstatus |= VS_CRASHED;
				MarkSingleVehicleDirty(u);
			}

			switch (v->type) {
				default: NOT_REACHED();
				case VEH_TRAIN:
					if (IsFrontEngine(v)) {
						pass += 4; // driver
						FreeTrainTrackReservation(v);
					}
					v->u.rail.crash_anim_pos = 4000; // max 4440, disappear pretty fast
					InvalidateWindowClassesData(WC_TRAINS_LIST, 0);
					break;

				case VEH_ROAD:
					if (IsRoadVehFront(v)) pass += 1; // driver
					v->u.road.crashed_ctr = 2000; // max 2220, disappear pretty fast
					InvalidateWindowClassesData(WC_ROADVEH_LIST, 0);
					break;

				case VEH_AIRCRAFT:
					pass += 2; // driver
					v->u.air.crashed_counter = 9000; // max 10000, disappear pretty fast
					InvalidateWindowClassesData(WC_AIRCRAFT_LIST, 0);
					break;
			}
		} else {
			return;
		}

		InvalidateWindowWidget(WC_VEHICLE_VIEW, v->index, VVW_WIDGET_START_STOP_VEH);
		InvalidateWindow(WC_VEHICLE_DEPOT, v->tile);

		SetDParam(0, pass);
		AddNewsItem(STR_B006_FLOOD_VEHICLE_DESTROYED,
			NS_ACCIDENT_VEHICLE,
			v->index,
			0);
		CreateEffectVehicleRel(v, 4, 4, 8, EV_EXPLOSION_LARGE);
		SndPlayVehicleFx(SND_12_EXPLOSION, v);
	}
}

/**
 * Returns the behaviour of a tile during flooding.
 *
 * @return Behaviour of the tile
 */
static FloodingBehaviour GetFloodingBehaviour(TileIndex tile)
{
	/* FLOOD_ACTIVE:  'single-corner-raised'-coast, sea, sea-shipdepots, sea-buoys, sea-docks (water part), rail with flooded halftile, sea-water-industries, sea-oilrigs
	 * FLOOD_DRYUP:   coast with more than one corner raised, coast with rail-track, coast with trees
	 * FLOOD_PASSIVE: (not used)
	 * FLOOD_NONE:    canals, rivers, everything else
	 */
	switch (GetTileType(tile)) {
		case MP_WATER:
			if (IsCoast(tile)) {
				Slope tileh = GetTileSlope(tile, NULL);
				return (IsSlopeWithOneCornerRaised(tileh) ? FLOOD_ACTIVE : FLOOD_DRYUP);
			} else {
				return (GetWaterClass(tile) == WATER_CLASS_SEA) ? FLOOD_ACTIVE : FLOOD_NONE;
			}

		case MP_RAILWAY:
			if (GetRailGroundType(tile) == RAIL_GROUND_WATER) {
				return (IsSlopeWithOneCornerRaised(GetTileSlope(tile, NULL)) ? FLOOD_ACTIVE : FLOOD_DRYUP);
			}
			return FLOOD_NONE;

		case MP_TREES:
			return (GetTreeGround(tile) == TREE_GROUND_SHORE ? FLOOD_DRYUP : FLOOD_NONE);

		case MP_STATION:
			if (IsBuoy(tile) || (IsDock(tile) && GetTileSlope(tile, NULL) == SLOPE_FLAT) || IsOilRig(tile)) {
				return (GetWaterClass(tile) == WATER_CLASS_SEA ? FLOOD_ACTIVE : FLOOD_NONE);
			}
			return FLOOD_NONE;

		case MP_INDUSTRY:
			return ((IsIndustryTileOnWater(tile) && GetWaterClass(tile) == WATER_CLASS_SEA) ? FLOOD_ACTIVE : FLOOD_NONE);

		default:
			return FLOOD_NONE;
	}
}

/**
 * Floods a tile.
 */
static void DoFloodTile(TileIndex target)
{
	assert(!IsTileType(target, MP_WATER));

	bool flooded = false; // Will be set to true if something is changed.

	_current_player = OWNER_WATER;

	Slope tileh = GetTileSlope(target, NULL);
	if (tileh != SLOPE_FLAT) {
		/* make coast.. */
		switch (GetTileType(target)) {
			case MP_RAILWAY: {
				if (!IsPlainRailTile(target)) break;

				flooded = FloodHalftile(target);

				Vehicle *v = FindFloodableVehicleOnTile(target);
				if (v != NULL) FloodVehicle(v);

				break;
			}

			case MP_TREES:
				if (!IsSlopeWithOneCornerRaised(tileh)) {
					SetTreeGroundDensity(target, TREE_GROUND_SHORE, 3);
					MarkTileDirtyByTile(target);
					flooded = true;
					break;
				}
			/* FALL THROUGH */
			case MP_CLEAR:
				if (CmdSucceeded(DoCommand(target, 0, 0, DC_EXEC, CMD_LANDSCAPE_CLEAR))) {
					MakeShore(target);
					MarkTileDirtyByTile(target);
					flooded = true;
				}
				break;

			default:
				break;
		}
	} else {
		/* Flood vehicles */
		Vehicle *v = FindFloodableVehicleOnTile(target);
		if (v != NULL) FloodVehicle(v);

		/* flood flat tile */
		if (CmdSucceeded(DoCommand(target, 0, 0, DC_EXEC, CMD_LANDSCAPE_CLEAR))) {
			MakeWater(target);
			MarkTileDirtyByTile(target);
			flooded = true;
		}
	}

	if (flooded) {
		/* Mark surrounding canal tiles dirty too to avoid glitches */
		MarkCanalsAndRiversAroundDirty(target);

		/* update signals if needed */
		UpdateSignalsInBuffer();
	}

	_current_player = OWNER_NONE;
}

/**
 * Drys a tile up.
 */
static void DoDryUp(TileIndex tile)
{
	_current_player = OWNER_WATER;

	switch (GetTileType(tile)) {
		case MP_RAILWAY:
			assert(IsPlainRailTile(tile));
			assert(GetRailGroundType(tile) == RAIL_GROUND_WATER);

			RailGroundType new_ground;
			switch (GetTrackBits(tile)) {
				case TRACK_BIT_UPPER: new_ground = RAIL_GROUND_FENCE_HORIZ1; break;
				case TRACK_BIT_LOWER: new_ground = RAIL_GROUND_FENCE_HORIZ2; break;
				case TRACK_BIT_LEFT:  new_ground = RAIL_GROUND_FENCE_VERT1;  break;
				case TRACK_BIT_RIGHT: new_ground = RAIL_GROUND_FENCE_VERT2;  break;
				default: NOT_REACHED();
			}
			SetRailGroundType(tile, new_ground);
			MarkTileDirtyByTile(tile);
			break;

		case MP_TREES:
			SetTreeGroundDensity(tile, TREE_GROUND_GRASS, 3);
			MarkTileDirtyByTile(tile);
			break;

		case MP_WATER:
			assert(IsCoast(tile));

			if (CmdSucceeded(DoCommand(tile, 0, 0, DC_EXEC, CMD_LANDSCAPE_CLEAR))) {
				MakeClear(tile, CLEAR_GRASS, 3);
				MarkTileDirtyByTile(tile);
			}
			break;

		default: NOT_REACHED();
	}

	_current_player = OWNER_NONE;
}

/**
 * Let a water tile floods its diagonal adjoining tiles
 * called from tunnelbridge_cmd, and by TileLoop_Industry() and TileLoop_Track()
 *
 * @param tile the water/shore tile that floods
 */
void TileLoop_Water(TileIndex tile)
{
	switch (GetFloodingBehaviour(tile)) {
		case FLOOD_ACTIVE:
			for (Direction dir = DIR_BEGIN; dir < DIR_END; dir++) {
				TileIndex dest = AddTileIndexDiffCWrap(tile, TileIndexDiffCByDir(dir));
				if (dest == INVALID_TILE) continue;
				/* do not try to flood water tiles - increases performance a lot */
				if (IsTileType(dest, MP_WATER)) continue;

				uint z_dest;
				Slope slope_dest = GetFoundationSlope(dest, &z_dest) & ~SLOPE_HALFTILE_MASK & ~SLOPE_STEEP;
				if (z_dest > 0) continue;

				if (!HasBit(_flood_from_dirs[slope_dest], ReverseDir(dir))) continue;

				DoFloodTile(dest);
			}
			break;

		case FLOOD_DRYUP: {
			Slope slope_here = GetFoundationSlope(tile, NULL) & ~SLOPE_HALFTILE_MASK & ~SLOPE_STEEP;
			uint check_dirs = _flood_from_dirs[slope_here];
			uint dir;
			FOR_EACH_SET_BIT(dir, check_dirs) {
				TileIndex dest = AddTileIndexDiffCWrap(tile, TileIndexDiffCByDir((Direction)dir));
				if (dest == INVALID_TILE) continue;

				FloodingBehaviour dest_behaviour = GetFloodingBehaviour(dest);
				if ((dest_behaviour == FLOOD_ACTIVE) || (dest_behaviour == FLOOD_PASSIVE)) return;
			}
			DoDryUp(tile);
			break;
		}

		default: return;
	}
}

void ConvertGroundTilesIntoWaterTiles()
{
	TileIndex tile;
	uint z;
	Slope slope;

	for (tile = 0; tile < MapSize(); ++tile) {
		slope = GetTileSlope(tile, &z);
		if (IsTileType(tile, MP_CLEAR) && z == 0) {
			/* Make both water for tiles at level 0
			 * and make shore, as that looks much better
			 * during the generation. */
			switch (slope) {
				case SLOPE_FLAT:
					MakeWater(tile);
					break;

				case SLOPE_N:
				case SLOPE_E:
				case SLOPE_S:
				case SLOPE_W:
					MakeShore(tile);
					break;

				default:
					uint check_dirs = _flood_from_dirs[slope & ~SLOPE_STEEP];
					uint dir;
					FOR_EACH_SET_BIT(dir, check_dirs) {
						TileIndex dest = TILE_ADD(tile, TileOffsByDir((Direction)dir));
						Slope slope_dest = GetTileSlope(dest, NULL) & ~SLOPE_STEEP;
						if (slope_dest == SLOPE_FLAT || IsSlopeWithOneCornerRaised(slope_dest)) {
							MakeShore(tile);
							break;
						}
					}
					break;
			}
		}
	}
}

static TrackStatus GetTileTrackStatus_Water(TileIndex tile, TransportType mode, uint sub_mode, DiagDirection side)
{
	static const byte coast_tracks[] = {0, 32, 4, 0, 16, 0, 0, 0, 8, 0, 0, 0, 0, 0, 0, 0};

	TrackBits ts;

	if (mode != TRANSPORT_WATER) return 0;

	switch (GetWaterTileType(tile)) {
		case WATER_TILE_CLEAR: ts = (GetTileSlope(tile, NULL) == SLOPE_FLAT) ? TRACK_BIT_ALL : TRACK_BIT_NONE; break;
		case WATER_TILE_COAST: ts = (TrackBits)coast_tracks[GetTileSlope(tile, NULL) & 0xF]; break;
		case WATER_TILE_LOCK:  ts = DiagDirToDiagTrackBits(GetLockDirection(tile)); break;
		case WATER_TILE_DEPOT: ts = AxisToTrackBits(GetShipDepotAxis(tile)); break;
		default: return 0;
	}
	if (TileX(tile) == 0) {
		/* NE border: remove tracks that connects NE tile edge */
		ts &= ~(TRACK_BIT_X | TRACK_BIT_UPPER | TRACK_BIT_RIGHT);
	}
	if (TileY(tile) == 0) {
		/* NW border: remove tracks that connects NW tile edge */
		ts &= ~(TRACK_BIT_Y | TRACK_BIT_LEFT | TRACK_BIT_UPPER);
	}
	return CombineTrackStatus(TrackBitsToTrackdirBits(ts), TRACKDIR_BIT_NONE);
}

static void ClickTile_Water(TileIndex tile)
{
	if (GetWaterTileType(tile) == WATER_TILE_DEPOT) {
		TileIndex tile2 = GetOtherShipDepotTile(tile);

		ShowDepotWindow(tile < tile2 ? tile : tile2, VEH_SHIP);
	}
}

static void ChangeTileOwner_Water(TileIndex tile, PlayerID old_player, PlayerID new_player)
{
	if (!IsTileOwner(tile, old_player)) return;

	if (new_player != PLAYER_SPECTATOR) {
		SetTileOwner(tile, new_player);
		return;
	}

	/* Remove depot */
	if (IsShipDepot(tile)) DoCommand(tile, 0, 0, DC_EXEC | DC_BANKRUPT, CMD_LANDSCAPE_CLEAR);

	/* Set owner of canals and locks ... and also canal under dock there was before.
	 * Check if the new owner after removing depot isn't OWNER_WATER. */
	if (IsTileOwner(tile, old_player)) SetTileOwner(tile, OWNER_NONE);
}

static VehicleEnterTileStatus VehicleEnter_Water(Vehicle *v, TileIndex tile, int x, int y)
{
	return VETSB_CONTINUE;
}

static CommandCost TerraformTile_Water(TileIndex tile, uint32 flags, uint z_new, Slope tileh_new)
{
	/* Canals can't be terraformed */
	if (IsWaterTile(tile) && IsCanal(tile)) return_cmd_error(STR_MUST_DEMOLISH_CANAL_FIRST);

	return DoCommand(tile, 0, 0, flags, CMD_LANDSCAPE_CLEAR);
}


extern const TileTypeProcs _tile_type_water_procs = {
	DrawTile_Water,           /* draw_tile_proc */
	GetSlopeZ_Water,          /* get_slope_z_proc */
	ClearTile_Water,          /* clear_tile_proc */
	GetAcceptedCargo_Water,   /* get_accepted_cargo_proc */
	GetTileDesc_Water,        /* get_tile_desc_proc */
	GetTileTrackStatus_Water, /* get_tile_track_status_proc */
	ClickTile_Water,          /* click_tile_proc */
	AnimateTile_Water,        /* animate_tile_proc */
	TileLoop_Water,           /* tile_loop_clear */
	ChangeTileOwner_Water,    /* change_tile_owner_clear */
	NULL,                     /* get_produced_cargo_proc */
	VehicleEnter_Water,       /* vehicle_enter_tile_proc */
	GetFoundation_Water,      /* get_foundation_proc */
	TerraformTile_Water,      /* terraform_tile_proc */
};