OpenTTD
road_cmd.cpp
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1 /* $Id: road_cmd.cpp 27746 2017-02-12 12:03:07Z frosch $ */
2 
3 /*
4  * This file is part of OpenTTD.
5  * OpenTTD is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, version 2.
6  * OpenTTD is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
7  * See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with OpenTTD. If not, see <http://www.gnu.org/licenses/>.
8  */
9 
12 #include "stdafx.h"
13 #include "cmd_helper.h"
14 #include "road_internal.h"
15 #include "viewport_func.h"
16 #include "command_func.h"
18 #include "depot_base.h"
19 #include "newgrf.h"
20 #include "autoslope.h"
21 #include "tunnelbridge_map.h"
22 #include "strings_func.h"
23 #include "vehicle_func.h"
24 #include "sound_func.h"
25 #include "tunnelbridge.h"
26 #include "cheat_type.h"
27 #include "effectvehicle_func.h"
28 #include "effectvehicle_base.h"
29 #include "elrail_func.h"
30 #include "roadveh.h"
31 #include "town.h"
32 #include "company_base.h"
33 #include "core/random_func.hpp"
34 #include "newgrf_railtype.h"
35 #include "date_func.h"
36 #include "genworld.h"
37 #include "company_gui.h"
38 
39 #include "table/strings.h"
40 
41 #include "safeguards.h"
42 
48 {
49  const RoadVehicle *rv;
50  FOR_ALL_ROADVEHICLES(rv) return true;
51 
52  return false;
53 }
54 
56 static const RoadBits _invalid_tileh_slopes_road[2][15] = {
57  /* The inverse of the mixable RoadBits on a leveled slope */
58  {
59  ROAD_NONE, // SLOPE_FLAT
60  ROAD_NE | ROAD_SE, // SLOPE_W
61  ROAD_NE | ROAD_NW, // SLOPE_S
62 
63  ROAD_NE, // SLOPE_SW
64  ROAD_NW | ROAD_SW, // SLOPE_E
65  ROAD_NONE, // SLOPE_EW
66 
67  ROAD_NW, // SLOPE_SE
68  ROAD_NONE, // SLOPE_WSE
69  ROAD_SE | ROAD_SW, // SLOPE_N
70 
71  ROAD_SE, // SLOPE_NW
72  ROAD_NONE, // SLOPE_NS
73  ROAD_NONE, // SLOPE_ENW
74 
75  ROAD_SW, // SLOPE_NE
76  ROAD_NONE, // SLOPE_SEN
77  ROAD_NONE // SLOPE_NWS
78  },
79  /* The inverse of the allowed straight roads on a slope
80  * (with and without a foundation). */
81  {
82  ROAD_NONE, // SLOPE_FLAT
83  ROAD_NONE, // SLOPE_W Foundation
84  ROAD_NONE, // SLOPE_S Foundation
85 
86  ROAD_Y, // SLOPE_SW
87  ROAD_NONE, // SLOPE_E Foundation
88  ROAD_ALL, // SLOPE_EW
89 
90  ROAD_X, // SLOPE_SE
91  ROAD_ALL, // SLOPE_WSE
92  ROAD_NONE, // SLOPE_N Foundation
93 
94  ROAD_X, // SLOPE_NW
95  ROAD_ALL, // SLOPE_NS
96  ROAD_ALL, // SLOPE_ENW
97 
98  ROAD_Y, // SLOPE_NE
99  ROAD_ALL, // SLOPE_SEN
100  ROAD_ALL // SLOPE_NW
101  }
102 };
103 
104 static Foundation GetRoadFoundation(Slope tileh, RoadBits bits);
105 
117 {
118  if (_game_mode == GM_EDITOR || remove == ROAD_NONE) return CommandCost();
119 
120  /* Water can always flood and towns can always remove "normal" road pieces.
121  * Towns are not be allowed to remove non "normal" road pieces, like tram
122  * tracks as that would result in trams that cannot turn. */
123  if (_current_company == OWNER_WATER ||
125 
126  /* Only do the special processing if the road is owned
127  * by a town */
128  if (owner != OWNER_TOWN) {
129  if (owner == OWNER_NONE) return CommandCost();
130  CommandCost ret = CheckOwnership(owner);
131  return ret;
132  }
133 
134  if (!town_check) return CommandCost();
135 
137 
138  Town *t = ClosestTownFromTile(tile, UINT_MAX);
139  if (t == NULL) return CommandCost();
140 
141  /* check if you're allowed to remove the street owned by a town
142  * removal allowance depends on difficulty setting */
143  CommandCost ret = CheckforTownRating(flags, t, ROAD_REMOVE);
144  if (ret.Failed()) return ret;
145 
146  /* Get a bitmask of which neighbouring roads has a tile */
147  RoadBits n = ROAD_NONE;
148  RoadBits present = GetAnyRoadBits(tile, rt);
149  if ((present & ROAD_NE) && (GetAnyRoadBits(TILE_ADDXY(tile, -1, 0), rt) & ROAD_SW)) n |= ROAD_NE;
150  if ((present & ROAD_SE) && (GetAnyRoadBits(TILE_ADDXY(tile, 0, 1), rt) & ROAD_NW)) n |= ROAD_SE;
151  if ((present & ROAD_SW) && (GetAnyRoadBits(TILE_ADDXY(tile, 1, 0), rt) & ROAD_NE)) n |= ROAD_SW;
152  if ((present & ROAD_NW) && (GetAnyRoadBits(TILE_ADDXY(tile, 0, -1), rt) & ROAD_SE)) n |= ROAD_NW;
153 
154  int rating_decrease = RATING_ROAD_DOWN_STEP_EDGE;
155  /* If 0 or 1 bits are set in n, or if no bits that match the bits to remove,
156  * then allow it */
157  if (KillFirstBit(n) != ROAD_NONE && (n & remove) != ROAD_NONE) {
158  /* you can remove all kind of roads with extra dynamite */
160  SetDParam(0, t->index);
161  return_cmd_error(STR_ERROR_LOCAL_AUTHORITY_REFUSES_TO_ALLOW_THIS);
162  }
163  rating_decrease = RATING_ROAD_DOWN_STEP_INNER;
164  }
165  ChangeTownRating(t, rating_decrease, RATING_ROAD_MINIMUM, flags);
166 
167  return CommandCost();
168 }
169 
170 
180 static CommandCost RemoveRoad(TileIndex tile, DoCommandFlag flags, RoadBits pieces, RoadType rt, bool crossing_check, bool town_check = true)
181 {
182  RoadTypes rts = GetRoadTypes(tile);
183  /* The tile doesn't have the given road type */
184  if (!HasBit(rts, rt)) return_cmd_error(rt == ROADTYPE_TRAM ? STR_ERROR_THERE_IS_NO_TRAMWAY : STR_ERROR_THERE_IS_NO_ROAD);
185 
186  switch (GetTileType(tile)) {
187  case MP_ROAD: {
189  if (ret.Failed()) return ret;
190  break;
191  }
192 
193  case MP_STATION: {
194  if (!IsDriveThroughStopTile(tile)) return CMD_ERROR;
195 
197  if (ret.Failed()) return ret;
198  break;
199  }
200 
201  case MP_TUNNELBRIDGE: {
204  if (ret.Failed()) return ret;
205  break;
206  }
207 
208  default:
209  return CMD_ERROR;
210  }
211 
212  CommandCost ret = CheckAllowRemoveRoad(tile, pieces, GetRoadOwner(tile, rt), rt, flags, town_check);
213  if (ret.Failed()) return ret;
214 
215  if (!IsTileType(tile, MP_ROAD)) {
216  /* If it's the last roadtype, just clear the whole tile */
217  if (rts == RoadTypeToRoadTypes(rt)) return DoCommand(tile, 0, 0, flags, CMD_LANDSCAPE_CLEAR);
218 
220  if (IsTileType(tile, MP_TUNNELBRIDGE)) {
221  /* Removing any roadbit in the bridge axis removes the roadtype (that's the behaviour remove-long-roads needs) */
222  if ((AxisToRoadBits(DiagDirToAxis(GetTunnelBridgeDirection(tile))) & pieces) == ROAD_NONE) return_cmd_error(rt == ROADTYPE_TRAM ? STR_ERROR_THERE_IS_NO_TRAMWAY : STR_ERROR_THERE_IS_NO_ROAD);
223 
224  TileIndex other_end = GetOtherTunnelBridgeEnd(tile);
225  /* Pay for *every* tile of the bridge or tunnel */
226  uint len = GetTunnelBridgeLength(other_end, tile) + 2;
227  cost.AddCost(len * 2 * _price[PR_CLEAR_ROAD]);
228  if (flags & DC_EXEC) {
229  Company *c = Company::GetIfValid(GetRoadOwner(tile, rt));
230  if (c != NULL) {
231  /* A full diagonal road tile has two road bits. */
234  }
235 
236  SetRoadTypes(other_end, GetRoadTypes(other_end) & ~RoadTypeToRoadTypes(rt));
237  SetRoadTypes(tile, GetRoadTypes(tile) & ~RoadTypeToRoadTypes(rt));
238 
239  /* If the owner of the bridge sells all its road, also move the ownership
240  * to the owner of the other roadtype, unless the bridge owner is a town. */
241  RoadType other_rt = (rt == ROADTYPE_ROAD) ? ROADTYPE_TRAM : ROADTYPE_ROAD;
242  Owner other_owner = GetRoadOwner(tile, other_rt);
243  if (!IsTileOwner(tile, other_owner) && !IsTileOwner(tile, OWNER_TOWN)) {
244  SetTileOwner(tile, other_owner);
245  SetTileOwner(other_end, other_owner);
246  }
247 
248  /* Mark tiles dirty that have been repaved */
249  if (IsBridge(tile)) {
250  MarkBridgeDirty(tile);
251  } else {
252  MarkTileDirtyByTile(tile);
253  MarkTileDirtyByTile(other_end);
254  }
255  }
256  } else {
257  assert(IsDriveThroughStopTile(tile));
258  cost.AddCost(_price[PR_CLEAR_ROAD] * 2);
259  if (flags & DC_EXEC) {
260  Company *c = Company::GetIfValid(GetRoadOwner(tile, rt));
261  if (c != NULL) {
262  /* A full diagonal road tile has two road bits. */
263  c->infrastructure.road[rt] -= 2;
265  }
266  SetRoadTypes(tile, GetRoadTypes(tile) & ~RoadTypeToRoadTypes(rt));
267  MarkTileDirtyByTile(tile);
268  }
269  }
270  return cost;
271  }
272 
273  switch (GetRoadTileType(tile)) {
274  case ROAD_TILE_NORMAL: {
275  Slope tileh = GetTileSlope(tile);
276 
277  /* Steep slopes behave the same as slopes with one corner raised. */
278  if (IsSteepSlope(tileh)) {
280  }
281 
282  RoadBits present = GetRoadBits(tile, rt);
283  const RoadBits other = GetOtherRoadBits(tile, rt);
284  const Foundation f = GetRoadFoundation(tileh, present);
285 
286  if (HasRoadWorks(tile) && _current_company != OWNER_WATER) return_cmd_error(STR_ERROR_ROAD_WORKS_IN_PROGRESS);
287 
288  /* Autocomplete to a straight road
289  * @li if the bits of the other roadtypes result in another foundation
290  * @li if build on slopes is disabled */
291  if ((IsStraightRoad(other) && (other & _invalid_tileh_slopes_road[0][tileh & SLOPE_ELEVATED]) != ROAD_NONE) ||
293  pieces |= MirrorRoadBits(pieces);
294  }
295 
296  /* limit the bits to delete to the existing bits. */
297  pieces &= present;
298  if (pieces == ROAD_NONE) return_cmd_error(rt == ROADTYPE_TRAM ? STR_ERROR_THERE_IS_NO_TRAMWAY : STR_ERROR_THERE_IS_NO_ROAD);
299 
300  /* Now set present what it will be after the remove */
301  present ^= pieces;
302 
303  /* Check for invalid RoadBit combinations on slopes */
304  if (tileh != SLOPE_FLAT && present != ROAD_NONE &&
305  (present & _invalid_tileh_slopes_road[0][tileh & SLOPE_ELEVATED]) == present) {
306  return CMD_ERROR;
307  }
308 
309  if (flags & DC_EXEC) {
310  if (HasRoadWorks(tile)) {
311  /* flooding tile with road works, don't forget to remove the effect vehicle too */
312  assert(_current_company == OWNER_WATER);
313  EffectVehicle *v;
315  if (TileVirtXY(v->x_pos, v->y_pos) == tile) {
316  delete v;
317  }
318  }
319  }
320 
321  Company *c = Company::GetIfValid(GetRoadOwner(tile, rt));
322  if (c != NULL) {
323  c->infrastructure.road[rt] -= CountBits(pieces);
325  }
326 
327  if (present == ROAD_NONE) {
329  if (rts == ROADTYPES_NONE) {
330  /* Includes MarkTileDirtyByTile() */
331  DoClearSquare(tile);
332  } else {
333  if (rt == ROADTYPE_ROAD && IsRoadOwner(tile, ROADTYPE_ROAD, OWNER_TOWN)) {
334  /* Update nearest-town index */
335  const Town *town = CalcClosestTownFromTile(tile);
336  SetTownIndex(tile, town == NULL ? (TownID)INVALID_TOWN : town->index);
337  }
338  SetRoadBits(tile, ROAD_NONE, rt);
339  SetRoadTypes(tile, rts);
340  MarkTileDirtyByTile(tile);
341  }
342  } else {
343  /* When bits are removed, you *always* end up with something that
344  * is not a complete straight road tile. However, trams do not have
345  * onewayness, so they cannot remove it either. */
347  SetRoadBits(tile, present, rt);
348  MarkTileDirtyByTile(tile);
349  }
350  }
351 
352  CommandCost cost(EXPENSES_CONSTRUCTION, CountBits(pieces) * _price[PR_CLEAR_ROAD]);
353  /* If we build a foundation we have to pay for it. */
354  if (f == FOUNDATION_NONE && GetRoadFoundation(tileh, present) != FOUNDATION_NONE) cost.AddCost(_price[PR_BUILD_FOUNDATION]);
355 
356  return cost;
357  }
358 
359  case ROAD_TILE_CROSSING: {
360  if (pieces & ComplementRoadBits(GetCrossingRoadBits(tile))) {
361  return CMD_ERROR;
362  }
363 
364  /* Don't allow road to be removed from the crossing when there is tram;
365  * we can't draw the crossing without roadbits ;) */
366  if (rt == ROADTYPE_ROAD && HasTileRoadType(tile, ROADTYPE_TRAM) && (flags & DC_EXEC || crossing_check)) return CMD_ERROR;
367 
368  if (flags & DC_EXEC) {
369  Company *c = Company::GetIfValid(GetRoadOwner(tile, rt));
370  if (c != NULL) {
371  /* A full diagonal road tile has two road bits. */
372  c->infrastructure.road[rt] -= 2;
374  }
375 
376  Track railtrack = GetCrossingRailTrack(tile);
378  if (rts == ROADTYPES_NONE) {
379  TrackBits tracks = GetCrossingRailBits(tile);
380  bool reserved = HasCrossingReservation(tile);
381  MakeRailNormal(tile, GetTileOwner(tile), tracks, GetRailType(tile));
382  if (reserved) SetTrackReservation(tile, tracks);
383 
384  /* Update rail count for level crossings. The plain track should still be accounted
385  * for, so only subtract the difference to the level crossing cost. */
387  if (c != NULL) {
390  }
391  } else {
392  SetRoadTypes(tile, rts);
393  }
394  MarkTileDirtyByTile(tile);
395  YapfNotifyTrackLayoutChange(tile, railtrack);
396  }
397  return CommandCost(EXPENSES_CONSTRUCTION, _price[PR_CLEAR_ROAD] * 2);
398  }
399 
400  default:
401  case ROAD_TILE_DEPOT:
402  return CMD_ERROR;
403  }
404 }
405 
406 
418 static CommandCost CheckRoadSlope(Slope tileh, RoadBits *pieces, RoadBits existing, RoadBits other)
419 {
420  /* Remove already build pieces */
421  CLRBITS(*pieces, existing);
422 
423  /* If we can't build anything stop here */
424  if (*pieces == ROAD_NONE) return CMD_ERROR;
425 
426  /* All RoadBit combos are valid on flat land */
427  if (tileh == SLOPE_FLAT) return CommandCost();
428 
429  /* Steep slopes behave the same as slopes with one corner raised. */
430  if (IsSteepSlope(tileh)) {
432  }
433 
434  /* Save the merge of all bits of the current type */
435  RoadBits type_bits = existing | *pieces;
436 
437  /* Roads on slopes */
438  if (_settings_game.construction.build_on_slopes && (_invalid_tileh_slopes_road[0][tileh] & (other | type_bits)) == ROAD_NONE) {
439 
440  /* If we add leveling we've got to pay for it */
441  if ((other | existing) == ROAD_NONE) return CommandCost(EXPENSES_CONSTRUCTION, _price[PR_BUILD_FOUNDATION]);
442 
443  return CommandCost();
444  }
445 
446  /* Autocomplete uphill roads */
447  *pieces |= MirrorRoadBits(*pieces);
448  type_bits = existing | *pieces;
449 
450  /* Uphill roads */
451  if (IsStraightRoad(type_bits) && (other == type_bits || other == ROAD_NONE) &&
452  (_invalid_tileh_slopes_road[1][tileh] & (other | type_bits)) == ROAD_NONE) {
453 
454  /* Slopes with foundation ? */
455  if (IsSlopeWithOneCornerRaised(tileh)) {
456 
457  /* Prevent build on slopes if it isn't allowed */
459 
460  /* If we add foundation we've got to pay for it */
461  if ((other | existing) == ROAD_NONE) return CommandCost(EXPENSES_CONSTRUCTION, _price[PR_BUILD_FOUNDATION]);
462 
463  return CommandCost();
464  }
465  } else {
466  if (HasExactlyOneBit(existing) && GetRoadFoundation(tileh, existing) == FOUNDATION_NONE) return CommandCost(EXPENSES_CONSTRUCTION, _price[PR_BUILD_FOUNDATION]);
467  return CommandCost();
468  }
469  }
470  return CMD_ERROR;
471 }
472 
484 CommandCost CmdBuildRoad(TileIndex tile, DoCommandFlag flags, uint32 p1, uint32 p2, const char *text)
485 {
486  CompanyID company = _current_company;
488 
489  RoadBits existing = ROAD_NONE;
490  RoadBits other_bits = ROAD_NONE;
491 
492  /* Road pieces are max 4 bitset values (NE, NW, SE, SW) and town can only be non-zero
493  * if a non-company is building the road */
494  if ((Company::IsValidID(company) && p2 != 0) || (company == OWNER_TOWN && !Town::IsValidID(p2)) || (company == OWNER_DEITY && p2 != 0)) return CMD_ERROR;
495  if (company != OWNER_TOWN) {
496  const Town *town = CalcClosestTownFromTile(tile);
497  p2 = (town != NULL) ? town->index : (TownID)INVALID_TOWN;
498 
499  if (company == OWNER_DEITY) {
500  company = OWNER_TOWN;
501 
502  /* If we are not within a town, we are not owned by the town */
503  if (town == NULL || DistanceSquare(tile, town->xy) > town->cache.squared_town_zone_radius[HZB_TOWN_EDGE]) {
504  company = OWNER_NONE;
505  }
506  }
507  }
508 
509  RoadBits pieces = Extract<RoadBits, 0, 4>(p1);
510 
511  /* do not allow building 'zero' road bits, code wouldn't handle it */
512  if (pieces == ROAD_NONE) return CMD_ERROR;
513 
514  RoadType rt = Extract<RoadType, 4, 2>(p1);
515  if (!IsValidRoadType(rt) || !ValParamRoadType(rt)) return CMD_ERROR;
516 
517  DisallowedRoadDirections toggle_drd = Extract<DisallowedRoadDirections, 6, 2>(p1);
518 
519  Slope tileh = GetTileSlope(tile);
520 
521  bool need_to_clear = false;
522  switch (GetTileType(tile)) {
523  case MP_ROAD:
524  switch (GetRoadTileType(tile)) {
525  case ROAD_TILE_NORMAL: {
526  if (HasRoadWorks(tile)) return_cmd_error(STR_ERROR_ROAD_WORKS_IN_PROGRESS);
527 
528  other_bits = GetOtherRoadBits(tile, rt);
529  if (!HasTileRoadType(tile, rt)) break;
530 
531  existing = GetRoadBits(tile, rt);
532  bool crossing = !IsStraightRoad(existing | pieces);
533  if (rt != ROADTYPE_TRAM && (GetDisallowedRoadDirections(tile) != DRD_NONE || toggle_drd != DRD_NONE) && crossing) {
534  /* Junctions cannot be one-way */
535  return_cmd_error(STR_ERROR_ONEWAY_ROADS_CAN_T_HAVE_JUNCTION);
536  }
537  if ((existing & pieces) == pieces) {
538  /* We only want to set the (dis)allowed road directions */
539  if (toggle_drd != DRD_NONE && rt != ROADTYPE_TRAM) {
540  if (crossing) return_cmd_error(STR_ERROR_ONEWAY_ROADS_CAN_T_HAVE_JUNCTION);
541 
543  if (owner != OWNER_NONE) {
544  CommandCost ret = CheckOwnership(owner, tile);
545  if (ret.Failed()) return ret;
546  }
547 
549  DisallowedRoadDirections dis_new = dis_existing ^ toggle_drd;
550 
551  /* We allow removing disallowed directions to break up
552  * deadlocks, but adding them can break articulated
553  * vehicles. As such, only when less is disallowed,
554  * i.e. bits are removed, we skip the vehicle check. */
555  if (CountBits(dis_existing) <= CountBits(dis_new)) {
557  if (ret.Failed()) return ret;
558  }
559 
560  /* Ignore half built tiles */
561  if ((flags & DC_EXEC) && rt != ROADTYPE_TRAM && IsStraightRoad(existing)) {
562  SetDisallowedRoadDirections(tile, dis_new);
563  MarkTileDirtyByTile(tile);
564  }
565  return CommandCost();
566  }
567  return_cmd_error(STR_ERROR_ALREADY_BUILT);
568  }
569  /* Disallow breaking end-of-line of someone else
570  * so trams can still reverse on this tile. */
571  if (rt == ROADTYPE_TRAM && HasExactlyOneBit(existing)) {
572  Owner owner = GetRoadOwner(tile, rt);
573  if (Company::IsValidID(owner)) {
574  CommandCost ret = CheckOwnership(owner);
575  if (ret.Failed()) return ret;
576  }
577  }
578  break;
579  }
580 
581  case ROAD_TILE_CROSSING:
582  other_bits = GetCrossingRoadBits(tile);
583  if (pieces & ComplementRoadBits(other_bits)) goto do_clear;
584  pieces = other_bits; // we need to pay for both roadbits
585 
586  if (HasTileRoadType(tile, rt)) return_cmd_error(STR_ERROR_ALREADY_BUILT);
587  break;
588 
589  case ROAD_TILE_DEPOT:
590  if ((GetAnyRoadBits(tile, rt) & pieces) == pieces) return_cmd_error(STR_ERROR_ALREADY_BUILT);
591  goto do_clear;
592 
593  default: NOT_REACHED();
594  }
595  break;
596 
597  case MP_RAILWAY: {
598  if (IsSteepSlope(tileh)) {
599  return_cmd_error(STR_ERROR_LAND_SLOPED_IN_WRONG_DIRECTION);
600  }
601 
602  /* Level crossings may only be built on these slopes */
603  if (!HasBit(VALID_LEVEL_CROSSING_SLOPES, tileh)) {
604  return_cmd_error(STR_ERROR_LAND_SLOPED_IN_WRONG_DIRECTION);
605  }
606 
607  if (GetRailTileType(tile) != RAIL_TILE_NORMAL) goto do_clear;
608 
609  if (RailNoLevelCrossings(GetRailType(tile))) {
610  return_cmd_error(STR_ERROR_CROSSING_DISALLOWED);
611  }
612 
613  Axis roaddir;
614  switch (GetTrackBits(tile)) {
615  case TRACK_BIT_X:
616  if (pieces & ROAD_X) goto do_clear;
617  roaddir = AXIS_Y;
618  break;
619 
620  case TRACK_BIT_Y:
621  if (pieces & ROAD_Y) goto do_clear;
622  roaddir = AXIS_X;
623  break;
624 
625  default: goto do_clear;
626  }
627 
629  if (ret.Failed()) return ret;
630 
631  if (flags & DC_EXEC) {
632  Track railtrack = AxisToTrack(OtherAxis(roaddir));
633  YapfNotifyTrackLayoutChange(tile, railtrack);
634  /* Update company infrastructure counts. A level crossing has two road bits. */
635  Company *c = Company::GetIfValid(company);
636  if (c != NULL) {
637  c->infrastructure.road[rt] += 2;
638  if (rt != ROADTYPE_ROAD) c->infrastructure.road[ROADTYPE_ROAD] += 2;
640  }
641  /* Update rail count for level crossings. The plain track is already
642  * counted, so only add the difference to the level crossing cost. */
644  if (c != NULL) {
647  }
648 
649  /* Always add road to the roadtypes (can't draw without it) */
650  bool reserved = HasBit(GetRailReservationTrackBits(tile), railtrack);
651  MakeRoadCrossing(tile, company, company, GetTileOwner(tile), roaddir, GetRailType(tile), RoadTypeToRoadTypes(rt) | ROADTYPES_ROAD, p2);
652  SetCrossingReservation(tile, reserved);
653  UpdateLevelCrossing(tile, false);
654  MarkTileDirtyByTile(tile);
655  }
656  return CommandCost(EXPENSES_CONSTRUCTION, _price[PR_BUILD_ROAD] * (rt == ROADTYPE_ROAD ? 2 : 4));
657  }
658 
659  case MP_STATION: {
660  if ((GetAnyRoadBits(tile, rt) & pieces) == pieces) return_cmd_error(STR_ERROR_ALREADY_BUILT);
661  if (!IsDriveThroughStopTile(tile)) goto do_clear;
662 
664  if (pieces & ~curbits) goto do_clear;
665  pieces = curbits; // we need to pay for both roadbits
666 
667  if (HasTileRoadType(tile, rt)) return_cmd_error(STR_ERROR_ALREADY_BUILT);
668  break;
669  }
670 
671  case MP_TUNNELBRIDGE: {
672  if (GetTunnelBridgeTransportType(tile) != TRANSPORT_ROAD) goto do_clear;
673  /* Only allow building the outern roadbit, so building long roads stops at existing bridges */
674  if (MirrorRoadBits(DiagDirToRoadBits(GetTunnelBridgeDirection(tile))) != pieces) goto do_clear;
675  if (HasTileRoadType(tile, rt)) return_cmd_error(STR_ERROR_ALREADY_BUILT);
676  /* Don't allow adding roadtype to the bridge/tunnel when vehicles are already driving on it */
678  if (ret.Failed()) return ret;
679  break;
680  }
681 
682  default: {
683 do_clear:;
684  need_to_clear = true;
685  break;
686  }
687  }
688 
689  if (need_to_clear) {
690  CommandCost ret = DoCommand(tile, 0, 0, flags, CMD_LANDSCAPE_CLEAR);
691  if (ret.Failed()) return ret;
692  cost.AddCost(ret);
693  }
694 
695  if (other_bits != pieces) {
696  /* Check the foundation/slopes when adding road/tram bits */
697  CommandCost ret = CheckRoadSlope(tileh, &pieces, existing, other_bits);
698  /* Return an error if we need to build a foundation (ret != 0) but the
699  * current setting is turned off */
700  if (ret.Failed() || (ret.GetCost() != 0 && !_settings_game.construction.build_on_slopes)) {
701  return_cmd_error(STR_ERROR_LAND_SLOPED_IN_WRONG_DIRECTION);
702  }
703  cost.AddCost(ret);
704  }
705 
706  if (!need_to_clear) {
707  if (IsTileType(tile, MP_ROAD)) {
708  /* Don't put the pieces that already exist */
709  pieces &= ComplementRoadBits(existing);
710 
711  /* Check if new road bits will have the same foundation as other existing road types */
712  if (IsNormalRoad(tile)) {
713  Slope slope = GetTileSlope(tile);
714  Foundation found_new = GetRoadFoundation(slope, pieces | existing);
715 
716  /* Test if all other roadtypes can be built at that foundation */
717  for (RoadType rtest = ROADTYPE_ROAD; rtest < ROADTYPE_END; rtest++) {
718  if (rtest != rt) { // check only other road types
719  RoadBits bits = GetRoadBits(tile, rtest);
720  /* do not check if there are not road bits of given type */
721  if (bits != ROAD_NONE && GetRoadFoundation(slope, bits) != found_new) {
722  return_cmd_error(STR_ERROR_LAND_SLOPED_IN_WRONG_DIRECTION);
723  }
724  }
725  }
726  }
727  }
728 
730  if (ret.Failed()) return ret;
731 
732  }
733 
734  uint num_pieces = (!need_to_clear && IsTileType(tile, MP_TUNNELBRIDGE)) ?
735  /* There are 2 pieces on *every* tile of the bridge or tunnel */
736  2 * (GetTunnelBridgeLength(GetOtherTunnelBridgeEnd(tile), tile) + 2) :
737  /* Count pieces */
738  CountBits(pieces);
739 
740  cost.AddCost(num_pieces * _price[PR_BUILD_ROAD]);
741 
742  if (flags & DC_EXEC) {
743  switch (GetTileType(tile)) {
744  case MP_ROAD: {
745  RoadTileType rtt = GetRoadTileType(tile);
746  if (existing == ROAD_NONE || rtt == ROAD_TILE_CROSSING) {
747  SetRoadTypes(tile, GetRoadTypes(tile) | RoadTypeToRoadTypes(rt));
748  SetRoadOwner(tile, rt, company);
749  if (rt == ROADTYPE_ROAD) SetTownIndex(tile, p2);
750  }
751  if (rtt != ROAD_TILE_CROSSING) SetRoadBits(tile, existing | pieces, rt);
752  break;
753  }
754 
755  case MP_TUNNELBRIDGE: {
756  TileIndex other_end = GetOtherTunnelBridgeEnd(tile);
757 
758  SetRoadTypes(other_end, GetRoadTypes(other_end) | RoadTypeToRoadTypes(rt));
759  SetRoadTypes(tile, GetRoadTypes(tile) | RoadTypeToRoadTypes(rt));
760  SetRoadOwner(other_end, rt, company);
761  SetRoadOwner(tile, rt, company);
762 
763  /* Mark tiles dirty that have been repaved */
764  if (IsBridge(tile)) {
765  MarkBridgeDirty(tile);
766  } else {
767  MarkTileDirtyByTile(other_end);
768  MarkTileDirtyByTile(tile);
769  }
770  break;
771  }
772 
773  case MP_STATION:
774  assert(IsDriveThroughStopTile(tile));
775  SetRoadTypes(tile, GetRoadTypes(tile) | RoadTypeToRoadTypes(rt));
776  SetRoadOwner(tile, rt, company);
777  break;
778 
779  default:
780  MakeRoadNormal(tile, pieces, RoadTypeToRoadTypes(rt), p2, company, company);
781  break;
782  }
783 
784  /* Update company infrastructure count. */
785  Company *c = Company::GetIfValid(GetRoadOwner(tile, rt));
786  if (c != NULL) {
787  if (IsTileType(tile, MP_TUNNELBRIDGE)) num_pieces *= TUNNELBRIDGE_TRACKBIT_FACTOR;
788  c->infrastructure.road[rt] += num_pieces;
790  }
791 
792  if (rt != ROADTYPE_TRAM && IsNormalRoadTile(tile)) {
793  existing |= pieces;
795  GetDisallowedRoadDirections(tile) ^ toggle_drd : DRD_NONE);
796  }
797 
798  MarkTileDirtyByTile(tile);
799  }
800  return cost;
801 }
802 
811 {
812  RoadBits bits = GetAnyRoadBits(tile + TileOffsByDiagDir(dir), rt, false);
813  return (bits & DiagDirToRoadBits(ReverseDiagDir(dir))) != 0;
814 }
815 
833 CommandCost CmdBuildLongRoad(TileIndex start_tile, DoCommandFlag flags, uint32 p1, uint32 p2, const char *text)
834 {
836 
837  if (p1 >= MapSize()) return CMD_ERROR;
838 
839  TileIndex end_tile = p1;
840  RoadType rt = Extract<RoadType, 3, 2>(p2);
841  if (!IsValidRoadType(rt) || !ValParamRoadType(rt)) return CMD_ERROR;
842 
843  Axis axis = Extract<Axis, 2, 1>(p2);
844  /* Only drag in X or Y direction dictated by the direction variable */
845  if (axis == AXIS_X && TileY(start_tile) != TileY(end_tile)) return CMD_ERROR; // x-axis
846  if (axis == AXIS_Y && TileX(start_tile) != TileX(end_tile)) return CMD_ERROR; // y-axis
847 
848  DiagDirection dir = AxisToDiagDir(axis);
849 
850  /* Swap direction, also the half-tile drag var (bit 0 and 1) */
851  if (start_tile > end_tile || (start_tile == end_tile && HasBit(p2, 0))) {
852  dir = ReverseDiagDir(dir);
853  p2 ^= 3;
854  drd = DRD_SOUTHBOUND;
855  }
856 
857  /* On the X-axis, we have to swap the initial bits, so they
858  * will be interpreted correctly in the GTTS. Furthermore
859  * when you just 'click' on one tile to build them. */
860  if ((axis == AXIS_Y) == (start_tile == end_tile && HasBit(p2, 0) == HasBit(p2, 1))) drd ^= DRD_BOTH;
861  /* No disallowed direction bits have to be toggled */
862  if (!HasBit(p2, 5)) drd = DRD_NONE;
863 
865  CommandCost last_error = CMD_ERROR;
866  TileIndex tile = start_tile;
867  bool had_bridge = false;
868  bool had_tunnel = false;
869  bool had_success = false;
870  bool is_ai = HasBit(p2, 6);
871 
872  /* Start tile is the first tile clicked by the user. */
873  for (;;) {
874  RoadBits bits = AxisToRoadBits(axis);
875 
876  /* Determine which road parts should be built. */
877  if (!is_ai && start_tile != end_tile) {
878  /* Only build the first and last roadbit if they can connect to something. */
879  if (tile == end_tile && !CanConnectToRoad(tile, rt, dir)) {
880  bits = DiagDirToRoadBits(ReverseDiagDir(dir));
881  } else if (tile == start_tile && !CanConnectToRoad(tile, rt, ReverseDiagDir(dir))) {
882  bits = DiagDirToRoadBits(dir);
883  }
884  } else {
885  /* Road parts only have to be built at the start tile or at the end tile. */
886  if (tile == end_tile && !HasBit(p2, 1)) bits &= DiagDirToRoadBits(ReverseDiagDir(dir));
887  if (tile == start_tile && HasBit(p2, 0)) bits &= DiagDirToRoadBits(dir);
888  }
889 
890  CommandCost ret = DoCommand(tile, drd << 6 | rt << 4 | bits, 0, flags, CMD_BUILD_ROAD);
891  if (ret.Failed()) {
892  last_error = ret;
893  if (last_error.GetErrorMessage() != STR_ERROR_ALREADY_BUILT) {
894  if (is_ai) return last_error;
895  break;
896  }
897  } else {
898  had_success = true;
899  /* Only pay for the upgrade on one side of the bridges and tunnels */
900  if (IsTileType(tile, MP_TUNNELBRIDGE)) {
901  if (IsBridge(tile)) {
902  if (!had_bridge || GetTunnelBridgeDirection(tile) == dir) {
903  cost.AddCost(ret);
904  }
905  had_bridge = true;
906  } else { // IsTunnel(tile)
907  if (!had_tunnel || GetTunnelBridgeDirection(tile) == dir) {
908  cost.AddCost(ret);
909  }
910  had_tunnel = true;
911  }
912  } else {
913  cost.AddCost(ret);
914  }
915  }
916 
917  if (tile == end_tile) break;
918 
919  tile += TileOffsByDiagDir(dir);
920  }
921 
922  return had_success ? cost : last_error;
923 }
924 
938 CommandCost CmdRemoveLongRoad(TileIndex start_tile, DoCommandFlag flags, uint32 p1, uint32 p2, const char *text)
939 {
941 
942  if (p1 >= MapSize()) return CMD_ERROR;
943 
944  TileIndex end_tile = p1;
945  RoadType rt = Extract<RoadType, 3, 2>(p2);
946  if (!IsValidRoadType(rt)) return CMD_ERROR;
947 
948  Axis axis = Extract<Axis, 2, 1>(p2);
949  /* Only drag in X or Y direction dictated by the direction variable */
950  if (axis == AXIS_X && TileY(start_tile) != TileY(end_tile)) return CMD_ERROR; // x-axis
951  if (axis == AXIS_Y && TileX(start_tile) != TileX(end_tile)) return CMD_ERROR; // y-axis
952 
953  /* Swap start and ending tile, also the half-tile drag var (bit 0 and 1) */
954  if (start_tile > end_tile || (start_tile == end_tile && HasBit(p2, 0))) {
955  TileIndex t = start_tile;
956  start_tile = end_tile;
957  end_tile = t;
958  p2 ^= IsInsideMM(p2 & 3, 1, 3) ? 3 : 0;
959  }
960 
962  TileIndex tile = start_tile;
963  CommandCost last_error = CMD_ERROR;
964  bool had_success = false;
965  /* Start tile is the small number. */
966  for (;;) {
967  RoadBits bits = AxisToRoadBits(axis);
968 
969  if (tile == end_tile && !HasBit(p2, 1)) bits &= ROAD_NW | ROAD_NE;
970  if (tile == start_tile && HasBit(p2, 0)) bits &= ROAD_SE | ROAD_SW;
971 
972  /* try to remove the halves. */
973  if (bits != 0) {
974  CommandCost ret = RemoveRoad(tile, flags & ~DC_EXEC, bits, rt, true);
975  if (ret.Succeeded()) {
976  if (flags & DC_EXEC) {
977  money -= ret.GetCost();
978  if (money < 0) {
979  _additional_cash_required = DoCommand(start_tile, end_tile, p2, flags & ~DC_EXEC, CMD_REMOVE_LONG_ROAD).GetCost();
980  return cost;
981  }
982  RemoveRoad(tile, flags, bits, rt, true, false);
983  }
984  cost.AddCost(ret);
985  had_success = true;
986  } else {
987  /* Ownership errors are more important. */
988  if (last_error.GetErrorMessage() != STR_ERROR_OWNED_BY) last_error = ret;
989  }
990  }
991 
992  if (tile == end_tile) break;
993 
994  tile += (axis == AXIS_Y) ? TileDiffXY(0, 1) : TileDiffXY(1, 0);
995  }
996 
997  return had_success ? cost : last_error;
998 }
999 
1013 CommandCost CmdBuildRoadDepot(TileIndex tile, DoCommandFlag flags, uint32 p1, uint32 p2, const char *text)
1014 {
1015  DiagDirection dir = Extract<DiagDirection, 0, 2>(p1);
1016  RoadType rt = Extract<RoadType, 2, 2>(p1);
1017 
1018  if (!IsValidRoadType(rt) || !ValParamRoadType(rt)) return CMD_ERROR;
1019 
1020  Slope tileh = GetTileSlope(tile);
1021  if (tileh != SLOPE_FLAT && (
1023  !CanBuildDepotByTileh(dir, tileh)
1024  )) {
1025  return_cmd_error(STR_ERROR_FLAT_LAND_REQUIRED);
1026  }
1027 
1028  CommandCost cost = DoCommand(tile, 0, 0, flags, CMD_LANDSCAPE_CLEAR);
1029  if (cost.Failed()) return cost;
1030 
1031  if (IsBridgeAbove(tile)) return_cmd_error(STR_ERROR_MUST_DEMOLISH_BRIDGE_FIRST);
1032 
1033  if (!Depot::CanAllocateItem()) return CMD_ERROR;
1034 
1035  if (flags & DC_EXEC) {
1036  Depot *dep = new Depot(tile);
1037  dep->build_date = _date;
1038 
1039  /* A road depot has two road bits. */
1040  Company::Get(_current_company)->infrastructure.road[rt] += 2;
1042 
1043  MakeRoadDepot(tile, _current_company, dep->index, dir, rt);
1044  MarkTileDirtyByTile(tile);
1045  MakeDefaultName(dep);
1046  }
1047  cost.AddCost(_price[PR_BUILD_DEPOT_ROAD]);
1048  return cost;
1049 }
1050 
1051 static CommandCost RemoveRoadDepot(TileIndex tile, DoCommandFlag flags)
1052 {
1053  if (_current_company != OWNER_WATER) {
1054  CommandCost ret = CheckTileOwnership(tile);
1055  if (ret.Failed()) return ret;
1056  }
1057 
1059  if (ret.Failed()) return ret;
1060 
1061  if (flags & DC_EXEC) {
1063  if (c != NULL) {
1064  /* A road depot has two road bits. */
1067  }
1068 
1069  delete Depot::GetByTile(tile);
1070  DoClearSquare(tile);
1071  }
1072 
1073  return CommandCost(EXPENSES_CONSTRUCTION, _price[PR_CLEAR_DEPOT_ROAD]);
1074 }
1075 
1076 static CommandCost ClearTile_Road(TileIndex tile, DoCommandFlag flags)
1077 {
1078  switch (GetRoadTileType(tile)) {
1079  case ROAD_TILE_NORMAL: {
1080  RoadBits b = GetAllRoadBits(tile);
1081 
1082  /* Clear the road if only one piece is on the tile OR we are not using the DC_AUTO flag */
1083  if ((HasExactlyOneBit(b) && GetRoadBits(tile, ROADTYPE_TRAM) == ROAD_NONE) || !(flags & DC_AUTO)) {
1085  RoadType rt;
1086  FOR_EACH_SET_ROADTYPE(rt, GetRoadTypes(tile)) {
1087  CommandCost tmp_ret = RemoveRoad(tile, flags, GetRoadBits(tile, rt), rt, true);
1088  if (tmp_ret.Failed()) return tmp_ret;
1089  ret.AddCost(tmp_ret);
1090  }
1091  return ret;
1092  }
1093  return_cmd_error(STR_ERROR_MUST_REMOVE_ROAD_FIRST);
1094  }
1095 
1096  case ROAD_TILE_CROSSING: {
1097  RoadTypes rts = GetRoadTypes(tile);
1099 
1100  if (flags & DC_AUTO) return_cmd_error(STR_ERROR_MUST_REMOVE_ROAD_FIRST);
1101 
1102  /* Must iterate over the roadtypes in a reverse manner because
1103  * tram tracks must be removed before the road bits. */
1104  RoadType rt = ROADTYPE_TRAM;
1105  do {
1106  if (HasBit(rts, rt)) {
1107  CommandCost tmp_ret = RemoveRoad(tile, flags, GetCrossingRoadBits(tile), rt, false);
1108  if (tmp_ret.Failed()) return tmp_ret;
1109  ret.AddCost(tmp_ret);
1110  }
1111  } while (rt-- != ROADTYPE_ROAD);
1112 
1113  if (flags & DC_EXEC) {
1114  DoCommand(tile, 0, 0, flags, CMD_LANDSCAPE_CLEAR);
1115  }
1116  return ret;
1117  }
1118 
1119  default:
1120  case ROAD_TILE_DEPOT:
1121  if (flags & DC_AUTO) {
1122  return_cmd_error(STR_ERROR_BUILDING_MUST_BE_DEMOLISHED);
1123  }
1124  return RemoveRoadDepot(tile, flags);
1125  }
1126 }
1127 
1128 
1130  uint16 image;
1131  byte subcoord_x;
1132  byte subcoord_y;
1133 };
1134 
1135 #include "table/road_land.h"
1136 
1145 {
1146  /* Flat land and land without a road doesn't require a foundation */
1147  if (tileh == SLOPE_FLAT || bits == ROAD_NONE) return FOUNDATION_NONE;
1148 
1149  /* Steep slopes behave the same as slopes with one corner raised. */
1150  if (IsSteepSlope(tileh)) {
1152  }
1153 
1154  /* Leveled RoadBits on a slope */
1155  if ((_invalid_tileh_slopes_road[0][tileh] & bits) == ROAD_NONE) return FOUNDATION_LEVELED;
1156 
1157  /* Straight roads without foundation on a slope */
1158  if (!IsSlopeWithOneCornerRaised(tileh) &&
1159  (_invalid_tileh_slopes_road[1][tileh] & bits) == ROAD_NONE)
1160  return FOUNDATION_NONE;
1161 
1162  /* Roads on steep Slopes or on Slopes with one corner raised */
1163  return (bits == ROAD_X ? FOUNDATION_INCLINED_X : FOUNDATION_INCLINED_Y);
1164 }
1165 
1166 const byte _road_sloped_sprites[14] = {
1167  0, 0, 2, 0,
1168  0, 1, 0, 0,
1169  3, 0, 0, 0,
1170  0, 0
1171 };
1172 
1182 static bool DrawRoadAsSnowDesert(TileIndex tile, Roadside roadside)
1183 {
1184  return (IsOnSnow(tile) &&
1185  !(_settings_game.game_creation.landscape == LT_TROPIC && HasGrfMiscBit(GMB_DESERT_PAVED_ROADS) &&
1186  roadside != ROADSIDE_BARREN && roadside != ROADSIDE_GRASS && roadside != ROADSIDE_GRASS_ROAD_WORKS));
1187 }
1188 
1194 void DrawRoadCatenary(const TileInfo *ti, RoadBits tram)
1195 {
1196  /* Do not draw catenary if it is invisible */
1197  if (IsInvisibilitySet(TO_CATENARY)) return;
1198 
1199  /* Don't draw the catenary under a low bridge */
1201  int height = GetBridgeHeight(GetNorthernBridgeEnd(ti->tile));
1202 
1203  if (height <= GetTileMaxZ(ti->tile) + 1) return;
1204  }
1205 
1206  SpriteID front;
1207  SpriteID back;
1208 
1209  if (ti->tileh != SLOPE_FLAT) {
1210  back = SPR_TRAMWAY_BACK_WIRES_SLOPED + _road_sloped_sprites[ti->tileh - 1];
1211  front = SPR_TRAMWAY_FRONT_WIRES_SLOPED + _road_sloped_sprites[ti->tileh - 1];
1212  } else {
1213  back = SPR_TRAMWAY_BASE + _road_backpole_sprites_1[tram];
1214  front = SPR_TRAMWAY_BASE + _road_frontwire_sprites_1[tram];
1215  }
1216 
1217  AddSortableSpriteToDraw(back, PAL_NONE, ti->x, ti->y, 16, 16, TILE_HEIGHT + BB_HEIGHT_UNDER_BRIDGE, ti->z, IsTransparencySet(TO_CATENARY));
1218  AddSortableSpriteToDraw(front, PAL_NONE, ti->x, ti->y, 16, 16, TILE_HEIGHT + BB_HEIGHT_UNDER_BRIDGE, ti->z, IsTransparencySet(TO_CATENARY));
1219 }
1220 
1229 static void DrawRoadDetail(SpriteID img, const TileInfo *ti, int dx, int dy, int h)
1230 {
1231  int x = ti->x | dx;
1232  int y = ti->y | dy;
1233  int z = ti->z;
1234  if (ti->tileh != SLOPE_FLAT) z = GetSlopePixelZ(x, y);
1235  AddSortableSpriteToDraw(img, PAL_NONE, x, y, 2, 2, h, z);
1236 }
1237 
1242 static void DrawRoadBits(TileInfo *ti)
1243 {
1244  RoadBits road = GetRoadBits(ti->tile, ROADTYPE_ROAD);
1245  RoadBits tram = GetRoadBits(ti->tile, ROADTYPE_TRAM);
1246 
1247  SpriteID image = 0;
1248  PaletteID pal = PAL_NONE;
1249 
1250  if (ti->tileh != SLOPE_FLAT) {
1251  DrawFoundation(ti, GetRoadFoundation(ti->tileh, road | tram));
1252 
1253  /* DrawFoundation() modifies ti.
1254  * Default sloped sprites.. */
1255  if (ti->tileh != SLOPE_FLAT) image = _road_sloped_sprites[ti->tileh - 1] + SPR_ROAD_SLOPE_START;
1256  }
1257 
1258  if (image == 0) image = _road_tile_sprites_1[road != ROAD_NONE ? road : tram];
1259 
1260  Roadside roadside = GetRoadside(ti->tile);
1261 
1262  if (DrawRoadAsSnowDesert(ti->tile, roadside)) {
1263  image += 19;
1264  } else {
1265  switch (roadside) {
1266  case ROADSIDE_BARREN: pal = PALETTE_TO_BARE_LAND; break;
1267  case ROADSIDE_GRASS: break;
1268  case ROADSIDE_GRASS_ROAD_WORKS: break;
1269  default: image -= 19; break; // Paved
1270  }
1271  }
1272 
1273  DrawGroundSprite(image, pal);
1274 
1275  /* For tram we overlay the road graphics with either tram tracks only
1276  * (when there is actual road beneath the trams) or with tram tracks
1277  * and some dirts which hides the road graphics */
1278  if (tram != ROAD_NONE) {
1279  if (ti->tileh != SLOPE_FLAT) {
1280  image = _road_sloped_sprites[ti->tileh - 1] + SPR_TRAMWAY_SLOPED_OFFSET;
1281  } else {
1282  image = _road_tile_sprites_1[tram] - SPR_ROAD_Y;
1283  }
1284  image += (road == ROAD_NONE) ? SPR_TRAMWAY_TRAM : SPR_TRAMWAY_OVERLAY;
1285  DrawGroundSprite(image, pal);
1286  }
1287 
1288  if (road != ROAD_NONE) {
1290  if (drd != DRD_NONE) {
1291  DrawGroundSpriteAt(SPR_ONEWAY_BASE + drd - 1 + ((road == ROAD_X) ? 0 : 3), PAL_NONE, 8, 8, GetPartialPixelZ(8, 8, ti->tileh));
1292  }
1293  }
1294 
1295  if (HasRoadWorks(ti->tile)) {
1296  /* Road works */
1297  DrawGroundSprite((road | tram) & ROAD_X ? SPR_EXCAVATION_X : SPR_EXCAVATION_Y, PAL_NONE);
1298  return;
1299  }
1300 
1301  if (tram != ROAD_NONE) DrawRoadCatenary(ti, tram);
1302 
1303  /* Return if full detail is disabled, or we are zoomed fully out. */
1304  if (!HasBit(_display_opt, DO_FULL_DETAIL) || _cur_dpi->zoom > ZOOM_LVL_DETAIL) return;
1305 
1306  /* Do not draw details (street lights, trees) under low bridge */
1307  if (IsBridgeAbove(ti->tile) && (roadside == ROADSIDE_TREES || roadside == ROADSIDE_STREET_LIGHTS)) {
1308  int height = GetBridgeHeight(GetNorthernBridgeEnd(ti->tile));
1309  int minz = GetTileMaxZ(ti->tile) + 2;
1310 
1311  if (roadside == ROADSIDE_TREES) minz++;
1312 
1313  if (height < minz) return;
1314  }
1315 
1316  /* If there are no road bits, return, as there is nothing left to do */
1317  if (HasAtMostOneBit(road)) return;
1318 
1319  /* Draw extra details. */
1320  for (const DrawRoadTileStruct *drts = _road_display_table[roadside][road | tram]; drts->image != 0; drts++) {
1321  DrawRoadDetail(drts->image, ti, drts->subcoord_x, drts->subcoord_y, 0x10);
1322  }
1323 }
1324 
1326 static void DrawTile_Road(TileInfo *ti)
1327 {
1328  switch (GetRoadTileType(ti->tile)) {
1329  case ROAD_TILE_NORMAL:
1330  DrawRoadBits(ti);
1331  break;
1332 
1333  case ROAD_TILE_CROSSING: {
1335 
1336  PaletteID pal = PAL_NONE;
1337  const RailtypeInfo *rti = GetRailTypeInfo(GetRailType(ti->tile));
1338 
1339  if (rti->UsesOverlay()) {
1340  Axis axis = GetCrossingRailAxis(ti->tile);
1341  SpriteID road = SPR_ROAD_Y + axis;
1342 
1343  Roadside roadside = GetRoadside(ti->tile);
1344 
1345  if (DrawRoadAsSnowDesert(ti->tile, roadside)) {
1346  road += 19;
1347  } else {
1348  switch (roadside) {
1349  case ROADSIDE_BARREN: pal = PALETTE_TO_BARE_LAND; break;
1350  case ROADSIDE_GRASS: break;
1351  default: road -= 19; break; // Paved
1352  }
1353  }
1354 
1355  DrawGroundSprite(road, pal);
1356 
1357  SpriteID rail = GetCustomRailSprite(rti, ti->tile, RTSG_CROSSING) + axis;
1358  /* Draw tracks, but draw PBS reserved tracks darker. */
1359  pal = (_game_mode != GM_MENU && _settings_client.gui.show_track_reservation && HasCrossingReservation(ti->tile)) ? PALETTE_CRASH : PAL_NONE;
1360  DrawGroundSprite(rail, pal);
1361 
1362  DrawRailTileSeq(ti, &_crossing_layout, TO_CATENARY, rail, 0, PAL_NONE);
1363  } else {
1364  SpriteID image = rti->base_sprites.crossing;
1365 
1366  if (GetCrossingRoadAxis(ti->tile) == AXIS_X) image++;
1367  if (IsCrossingBarred(ti->tile)) image += 2;
1368 
1369  Roadside roadside = GetRoadside(ti->tile);
1370 
1371  if (DrawRoadAsSnowDesert(ti->tile, roadside)) {
1372  image += 8;
1373  } else {
1374  switch (roadside) {
1375  case ROADSIDE_BARREN: pal = PALETTE_TO_BARE_LAND; break;
1376  case ROADSIDE_GRASS: break;
1377  default: image += 4; break; // Paved
1378  }
1379  }
1380 
1381  DrawGroundSprite(image, pal);
1382 
1383  /* PBS debugging, draw reserved tracks darker */
1384  if (_game_mode != GM_MENU && _settings_client.gui.show_track_reservation && HasCrossingReservation(ti->tile)) {
1386  }
1387  }
1388 
1389  if (HasTileRoadType(ti->tile, ROADTYPE_TRAM)) {
1390  DrawGroundSprite(SPR_TRAMWAY_OVERLAY + (GetCrossingRoadAxis(ti->tile) ^ 1), pal);
1392  }
1394  break;
1395  }
1396 
1397  default:
1398  case ROAD_TILE_DEPOT: {
1400 
1401  PaletteID palette = COMPANY_SPRITE_COLOUR(GetTileOwner(ti->tile));
1402 
1403  const DrawTileSprites *dts;
1404  if (HasTileRoadType(ti->tile, ROADTYPE_TRAM)) {
1405  dts = &_tram_depot[GetRoadDepotDirection(ti->tile)];
1406  } else {
1407  dts = &_road_depot[GetRoadDepotDirection(ti->tile)];
1408  }
1409 
1410  DrawGroundSprite(dts->ground.sprite, PAL_NONE);
1411  DrawOrigTileSeq(ti, dts, TO_BUILDINGS, palette);
1412  break;
1413  }
1414  }
1415  DrawBridgeMiddle(ti);
1416 }
1417 
1425 void DrawRoadDepotSprite(int x, int y, DiagDirection dir, RoadType rt)
1426 {
1427  PaletteID palette = COMPANY_SPRITE_COLOUR(_local_company);
1428  const DrawTileSprites *dts = (rt == ROADTYPE_TRAM) ? &_tram_depot[dir] : &_road_depot[dir];
1429 
1430  DrawSprite(dts->ground.sprite, PAL_NONE, x, y);
1431  DrawOrigTileSeqInGUI(x, y, dts, palette);
1432 }
1433 
1439 void UpdateNearestTownForRoadTiles(bool invalidate)
1440 {
1441  assert(!invalidate || _generating_world);
1442 
1443  for (TileIndex t = 0; t < MapSize(); t++) {
1444  if (IsTileType(t, MP_ROAD) && !IsRoadDepot(t) && !HasTownOwnedRoad(t)) {
1445  TownID tid = (TownID)INVALID_TOWN;
1446  if (!invalidate) {
1447  const Town *town = CalcClosestTownFromTile(t);
1448  if (town != NULL) tid = town->index;
1449  }
1450  SetTownIndex(t, tid);
1451  }
1452  }
1453 }
1454 
1455 static int GetSlopePixelZ_Road(TileIndex tile, uint x, uint y)
1456 {
1457 
1458  if (IsNormalRoad(tile)) {
1459  int z;
1460  Slope tileh = GetTilePixelSlope(tile, &z);
1461  if (tileh == SLOPE_FLAT) return z;
1462 
1463  Foundation f = GetRoadFoundation(tileh, GetAllRoadBits(tile));
1464  z += ApplyPixelFoundationToSlope(f, &tileh);
1465  return z + GetPartialPixelZ(x & 0xF, y & 0xF, tileh);
1466  } else {
1467  return GetTileMaxPixelZ(tile);
1468  }
1469 }
1470 
1471 static Foundation GetFoundation_Road(TileIndex tile, Slope tileh)
1472 {
1473  if (IsNormalRoad(tile)) {
1474  return GetRoadFoundation(tileh, GetAllRoadBits(tile));
1475  } else {
1476  return FlatteningFoundation(tileh);
1477  }
1478 }
1479 
1480 static const Roadside _town_road_types[][2] = {
1486 };
1487 
1488 static const Roadside _town_road_types_2[][2] = {
1494 };
1495 
1496 
1497 static void TileLoop_Road(TileIndex tile)
1498 {
1500  case LT_ARCTIC:
1501  if (IsOnSnow(tile) != (GetTileZ(tile) > GetSnowLine())) {
1502  ToggleSnow(tile);
1503  MarkTileDirtyByTile(tile);
1504  }
1505  break;
1506 
1507  case LT_TROPIC:
1508  if (GetTropicZone(tile) == TROPICZONE_DESERT && !IsOnDesert(tile)) {
1509  ToggleDesert(tile);
1510  MarkTileDirtyByTile(tile);
1511  }
1512  break;
1513  }
1514 
1515  if (IsRoadDepot(tile)) return;
1516 
1517  const Town *t = ClosestTownFromTile(tile, UINT_MAX);
1518  if (!HasRoadWorks(tile)) {
1519  HouseZonesBits grp = HZB_TOWN_EDGE;
1520 
1521  if (t != NULL) {
1522  grp = GetTownRadiusGroup(t, tile);
1523 
1524  /* Show an animation to indicate road work */
1525  if (t->road_build_months != 0 &&
1526  (DistanceManhattan(t->xy, tile) < 8 || grp != HZB_TOWN_EDGE) &&
1527  IsNormalRoad(tile) && !HasAtMostOneBit(GetAllRoadBits(tile))) {
1528  if (GetFoundationSlope(tile) == SLOPE_FLAT && EnsureNoVehicleOnGround(tile).Succeeded() && Chance16(1, 40)) {
1529  StartRoadWorks(tile);
1530 
1531  if (_settings_client.sound.ambient) SndPlayTileFx(SND_21_JACKHAMMER, tile);
1533  TileX(tile) * TILE_SIZE + 7,
1534  TileY(tile) * TILE_SIZE + 7,
1535  0,
1536  EV_BULLDOZER);
1537  MarkTileDirtyByTile(tile);
1538  return;
1539  }
1540  }
1541  }
1542 
1543  {
1544  /* Adjust road ground type depending on 'grp' (grp is the distance to the center) */
1545  const Roadside *new_rs = (_settings_game.game_creation.landscape == LT_TOYLAND) ? _town_road_types_2[grp] : _town_road_types[grp];
1546  Roadside cur_rs = GetRoadside(tile);
1547 
1548  /* We have our desired type, do nothing */
1549  if (cur_rs == new_rs[0]) return;
1550 
1551  /* We have the pre-type of the desired type, switch to the desired type */
1552  if (cur_rs == new_rs[1]) {
1553  cur_rs = new_rs[0];
1554  /* We have barren land, install the pre-type */
1555  } else if (cur_rs == ROADSIDE_BARREN) {
1556  cur_rs = new_rs[1];
1557  /* We're totally off limits, remove any installation and make barren land */
1558  } else {
1559  cur_rs = ROADSIDE_BARREN;
1560  }
1561  SetRoadside(tile, cur_rs);
1562  MarkTileDirtyByTile(tile);
1563  }
1564  } else if (IncreaseRoadWorksCounter(tile)) {
1565  TerminateRoadWorks(tile);
1566 
1568  /* Generate a nicer town surface */
1569  const RoadBits old_rb = GetAnyRoadBits(tile, ROADTYPE_ROAD);
1570  const RoadBits new_rb = CleanUpRoadBits(tile, old_rb);
1571 
1572  if (old_rb != new_rb) {
1573  RemoveRoad(tile, DC_EXEC | DC_AUTO | DC_NO_WATER, (old_rb ^ new_rb), ROADTYPE_ROAD, true);
1574  }
1575  }
1576 
1577  MarkTileDirtyByTile(tile);
1578  }
1579 }
1580 
1581 static bool ClickTile_Road(TileIndex tile)
1582 {
1583  if (!IsRoadDepot(tile)) return false;
1584 
1585  ShowDepotWindow(tile, VEH_ROAD);
1586  return true;
1587 }
1588 
1589 /* Converts RoadBits to TrackBits */
1590 static const TrackBits _road_trackbits[16] = {
1591  TRACK_BIT_NONE, // ROAD_NONE
1592  TRACK_BIT_NONE, // ROAD_NW
1593  TRACK_BIT_NONE, // ROAD_SW
1594  TRACK_BIT_LEFT, // ROAD_W
1595  TRACK_BIT_NONE, // ROAD_SE
1596  TRACK_BIT_Y, // ROAD_Y
1597  TRACK_BIT_LOWER, // ROAD_S
1598  TRACK_BIT_LEFT | TRACK_BIT_LOWER | TRACK_BIT_Y, // ROAD_Y | ROAD_SW
1599  TRACK_BIT_NONE, // ROAD_NE
1600  TRACK_BIT_UPPER, // ROAD_N
1601  TRACK_BIT_X, // ROAD_X
1602  TRACK_BIT_LEFT | TRACK_BIT_UPPER | TRACK_BIT_X, // ROAD_X | ROAD_NW
1603  TRACK_BIT_RIGHT, // ROAD_E
1604  TRACK_BIT_RIGHT | TRACK_BIT_UPPER | TRACK_BIT_Y, // ROAD_Y | ROAD_NE
1605  TRACK_BIT_RIGHT | TRACK_BIT_LOWER | TRACK_BIT_X, // ROAD_X | ROAD_SE
1606  TRACK_BIT_ALL, // ROAD_ALL
1607 };
1608 
1609 static TrackStatus GetTileTrackStatus_Road(TileIndex tile, TransportType mode, uint sub_mode, DiagDirection side)
1610 {
1611  TrackdirBits trackdirbits = TRACKDIR_BIT_NONE;
1612  TrackdirBits red_signals = TRACKDIR_BIT_NONE; // crossing barred
1613  switch (mode) {
1614  case TRANSPORT_RAIL:
1615  if (IsLevelCrossing(tile)) trackdirbits = TrackBitsToTrackdirBits(GetCrossingRailBits(tile));
1616  break;
1617 
1618  case TRANSPORT_ROAD:
1619  if ((GetRoadTypes(tile) & sub_mode) == 0) break;
1620  switch (GetRoadTileType(tile)) {
1621  case ROAD_TILE_NORMAL: {
1622  const uint drd_to_multiplier[DRD_END] = { 0x101, 0x100, 0x1, 0x0 };
1623  RoadType rt = (RoadType)FindFirstBit(sub_mode);
1624  RoadBits bits = GetRoadBits(tile, rt);
1625 
1626  /* no roadbit at this side of tile, return 0 */
1627  if (side != INVALID_DIAGDIR && (DiagDirToRoadBits(side) & bits) == 0) break;
1628 
1629  uint multiplier = drd_to_multiplier[rt == ROADTYPE_TRAM ? DRD_NONE : GetDisallowedRoadDirections(tile)];
1630  if (!HasRoadWorks(tile)) trackdirbits = (TrackdirBits)(_road_trackbits[bits] * multiplier);
1631  break;
1632  }
1633 
1634  case ROAD_TILE_CROSSING: {
1635  Axis axis = GetCrossingRoadAxis(tile);
1636 
1637  if (side != INVALID_DIAGDIR && axis != DiagDirToAxis(side)) break;
1638 
1639  trackdirbits = TrackBitsToTrackdirBits(AxisToTrackBits(axis));
1640  if (IsCrossingBarred(tile)) red_signals = trackdirbits;
1641  break;
1642  }
1643 
1644  default:
1645  case ROAD_TILE_DEPOT: {
1647 
1648  if (side != INVALID_DIAGDIR && side != dir) break;
1649 
1650  trackdirbits = TrackBitsToTrackdirBits(DiagDirToDiagTrackBits(dir));
1651  break;
1652  }
1653  }
1654  break;
1655 
1656  default: break;
1657  }
1658  return CombineTrackStatus(trackdirbits, red_signals);
1659 }
1660 
1661 static const StringID _road_tile_strings[] = {
1662  STR_LAI_ROAD_DESCRIPTION_ROAD,
1663  STR_LAI_ROAD_DESCRIPTION_ROAD,
1664  STR_LAI_ROAD_DESCRIPTION_ROAD,
1665  STR_LAI_ROAD_DESCRIPTION_ROAD_WITH_STREETLIGHTS,
1666  STR_LAI_ROAD_DESCRIPTION_ROAD,
1667  STR_LAI_ROAD_DESCRIPTION_TREE_LINED_ROAD,
1668  STR_LAI_ROAD_DESCRIPTION_ROAD,
1669  STR_LAI_ROAD_DESCRIPTION_ROAD,
1670 };
1671 
1672 static void GetTileDesc_Road(TileIndex tile, TileDesc *td)
1673 {
1674  Owner rail_owner = INVALID_OWNER;
1675  Owner road_owner = INVALID_OWNER;
1676  Owner tram_owner = INVALID_OWNER;
1677 
1678  switch (GetRoadTileType(tile)) {
1679  case ROAD_TILE_CROSSING: {
1680  td->str = STR_LAI_ROAD_DESCRIPTION_ROAD_RAIL_LEVEL_CROSSING;
1681  RoadTypes rts = GetRoadTypes(tile);
1682  rail_owner = GetTileOwner(tile);
1683  if (HasBit(rts, ROADTYPE_ROAD)) road_owner = GetRoadOwner(tile, ROADTYPE_ROAD);
1684  if (HasBit(rts, ROADTYPE_TRAM)) tram_owner = GetRoadOwner(tile, ROADTYPE_TRAM);
1685 
1686  const RailtypeInfo *rti = GetRailTypeInfo(GetRailType(tile));
1687  td->railtype = rti->strings.name;
1688  td->rail_speed = rti->max_speed;
1689 
1690  break;
1691  }
1692 
1693  case ROAD_TILE_DEPOT:
1694  td->str = STR_LAI_ROAD_DESCRIPTION_ROAD_VEHICLE_DEPOT;
1695  road_owner = GetTileOwner(tile); // Tile has only one owner, roadtype does not matter
1696  td->build_date = Depot::GetByTile(tile)->build_date;
1697  break;
1698 
1699  default: {
1700  RoadTypes rts = GetRoadTypes(tile);
1701  td->str = (HasBit(rts, ROADTYPE_ROAD) ? _road_tile_strings[GetRoadside(tile)] : STR_LAI_ROAD_DESCRIPTION_TRAMWAY);
1702  if (HasBit(rts, ROADTYPE_ROAD)) road_owner = GetRoadOwner(tile, ROADTYPE_ROAD);
1703  if (HasBit(rts, ROADTYPE_TRAM)) tram_owner = GetRoadOwner(tile, ROADTYPE_TRAM);
1704  break;
1705  }
1706  }
1707 
1708  /* Now we have to discover, if the tile has only one owner or many:
1709  * - Find a first_owner of the tile. (Currently road or tram must be present, but this will break when the third type becomes available)
1710  * - Compare the found owner with the other owners, and test if they differ.
1711  * Note: If road exists it will be the first_owner.
1712  */
1713  Owner first_owner = (road_owner == INVALID_OWNER ? tram_owner : road_owner);
1714  bool mixed_owners = (tram_owner != INVALID_OWNER && tram_owner != first_owner) || (rail_owner != INVALID_OWNER && rail_owner != first_owner);
1715 
1716  if (mixed_owners) {
1717  /* Multiple owners */
1718  td->owner_type[0] = (rail_owner == INVALID_OWNER ? STR_NULL : STR_LAND_AREA_INFORMATION_RAIL_OWNER);
1719  td->owner[0] = rail_owner;
1720  td->owner_type[1] = (road_owner == INVALID_OWNER ? STR_NULL : STR_LAND_AREA_INFORMATION_ROAD_OWNER);
1721  td->owner[1] = road_owner;
1722  td->owner_type[2] = (tram_owner == INVALID_OWNER ? STR_NULL : STR_LAND_AREA_INFORMATION_TRAM_OWNER);
1723  td->owner[2] = tram_owner;
1724  } else {
1725  /* One to rule them all */
1726  td->owner[0] = first_owner;
1727  }
1728 }
1729 
1734 static const byte _roadveh_enter_depot_dir[4] = {
1736 };
1737 
1738 static VehicleEnterTileStatus VehicleEnter_Road(Vehicle *v, TileIndex tile, int x, int y)
1739 {
1740  switch (GetRoadTileType(tile)) {
1741  case ROAD_TILE_DEPOT: {
1742  if (v->type != VEH_ROAD) break;
1743 
1744  RoadVehicle *rv = RoadVehicle::From(v);
1745  if (rv->frame == RVC_DEPOT_STOP_FRAME &&
1746  _roadveh_enter_depot_dir[GetRoadDepotDirection(tile)] == rv->state) {
1747  rv->state = RVSB_IN_DEPOT;
1748  rv->vehstatus |= VS_HIDDEN;
1749  rv->direction = ReverseDir(rv->direction);
1750  if (rv->Next() == NULL) VehicleEnterDepot(rv->First());
1751  rv->tile = tile;
1752 
1754  return VETSB_ENTERED_WORMHOLE;
1755  }
1756  break;
1757  }
1758 
1759  default: break;
1760  }
1761  return VETSB_CONTINUE;
1762 }
1763 
1764 
1765 static void ChangeTileOwner_Road(TileIndex tile, Owner old_owner, Owner new_owner)
1766 {
1767  if (IsRoadDepot(tile)) {
1768  if (GetTileOwner(tile) == old_owner) {
1769  if (new_owner == INVALID_OWNER) {
1770  DoCommand(tile, 0, 0, DC_EXEC | DC_BANKRUPT, CMD_LANDSCAPE_CLEAR);
1771  } else {
1772  /* A road depot has two road bits. No need to dirty windows here, we'll redraw the whole screen anyway. */
1774  Company::Get(old_owner)->infrastructure.road[rt] -= 2;
1775  Company::Get(new_owner)->infrastructure.road[rt] += 2;
1776 
1777  SetTileOwner(tile, new_owner);
1778  for (RoadType rt = ROADTYPE_ROAD; rt < ROADTYPE_END; rt++) {
1779  if (GetRoadOwner(tile, rt) == old_owner) {
1780  SetRoadOwner(tile, rt, new_owner);
1781  }
1782  }
1783  }
1784  }
1785  return;
1786  }
1787 
1788  for (RoadType rt = ROADTYPE_ROAD; rt < ROADTYPE_END; rt++) {
1789  /* Update all roadtypes, no matter if they are present */
1790  if (GetRoadOwner(tile, rt) == old_owner) {
1791  if (HasTileRoadType(tile, rt)) {
1792  /* A level crossing has two road bits. No need to dirty windows here, we'll redraw the whole screen anyway. */
1793  uint num_bits = IsLevelCrossing(tile) ? 2 : CountBits(GetRoadBits(tile, rt));
1794  Company::Get(old_owner)->infrastructure.road[rt] -= num_bits;
1795  if (new_owner != INVALID_OWNER) Company::Get(new_owner)->infrastructure.road[rt] += num_bits;
1796  }
1797 
1798  SetRoadOwner(tile, rt, new_owner == INVALID_OWNER ? OWNER_NONE : new_owner);
1799  }
1800  }
1801 
1802  if (IsLevelCrossing(tile)) {
1803  if (GetTileOwner(tile) == old_owner) {
1804  if (new_owner == INVALID_OWNER) {
1806  } else {
1807  /* Update infrastructure counts. No need to dirty windows here, we'll redraw the whole screen anyway. */
1808  Company::Get(old_owner)->infrastructure.rail[GetRailType(tile)] -= LEVELCROSSING_TRACKBIT_FACTOR;
1809  Company::Get(new_owner)->infrastructure.rail[GetRailType(tile)] += LEVELCROSSING_TRACKBIT_FACTOR;
1810 
1811  SetTileOwner(tile, new_owner);
1812  }
1813  }
1814  }
1815 }
1816 
1817 static CommandCost TerraformTile_Road(TileIndex tile, DoCommandFlag flags, int z_new, Slope tileh_new)
1818 {
1820  switch (GetRoadTileType(tile)) {
1821  case ROAD_TILE_CROSSING:
1822  if (!IsSteepSlope(tileh_new) && (GetTileMaxZ(tile) == z_new + GetSlopeMaxZ(tileh_new)) && HasBit(VALID_LEVEL_CROSSING_SLOPES, tileh_new)) return CommandCost(EXPENSES_CONSTRUCTION, _price[PR_BUILD_FOUNDATION]);
1823  break;
1824 
1825  case ROAD_TILE_DEPOT:
1826  if (AutoslopeCheckForEntranceEdge(tile, z_new, tileh_new, GetRoadDepotDirection(tile))) return CommandCost(EXPENSES_CONSTRUCTION, _price[PR_BUILD_FOUNDATION]);
1827  break;
1828 
1829  case ROAD_TILE_NORMAL: {
1830  RoadBits bits = GetAllRoadBits(tile);
1831  RoadBits bits_copy = bits;
1832  /* Check if the slope-road_bits combination is valid at all, i.e. it is safe to call GetRoadFoundation(). */
1833  if (CheckRoadSlope(tileh_new, &bits_copy, ROAD_NONE, ROAD_NONE).Succeeded()) {
1834  /* CheckRoadSlope() sometimes changes the road_bits, if it does not agree with them. */
1835  if (bits == bits_copy) {
1836  int z_old;
1837  Slope tileh_old = GetTileSlope(tile, &z_old);
1838 
1839  /* Get the slope on top of the foundation */
1840  z_old += ApplyFoundationToSlope(GetRoadFoundation(tileh_old, bits), &tileh_old);
1841  z_new += ApplyFoundationToSlope(GetRoadFoundation(tileh_new, bits), &tileh_new);
1842 
1843  /* The surface slope must not be changed */
1844  if ((z_old == z_new) && (tileh_old == tileh_new)) return CommandCost(EXPENSES_CONSTRUCTION, _price[PR_BUILD_FOUNDATION]);
1845  }
1846  }
1847  break;
1848  }
1849 
1850  default: NOT_REACHED();
1851  }
1852  }
1853 
1854  return DoCommand(tile, 0, 0, flags, CMD_LANDSCAPE_CLEAR);
1855 }
1856 
1858 extern const TileTypeProcs _tile_type_road_procs = {
1859  DrawTile_Road, // draw_tile_proc
1860  GetSlopePixelZ_Road, // get_slope_z_proc
1861  ClearTile_Road, // clear_tile_proc
1862  NULL, // add_accepted_cargo_proc
1863  GetTileDesc_Road, // get_tile_desc_proc
1864  GetTileTrackStatus_Road, // get_tile_track_status_proc
1865  ClickTile_Road, // click_tile_proc
1866  NULL, // animate_tile_proc
1867  TileLoop_Road, // tile_loop_proc
1868  ChangeTileOwner_Road, // change_tile_owner_proc
1869  NULL, // add_produced_cargo_proc
1870  VehicleEnter_Road, // vehicle_enter_tile_proc
1871  GetFoundation_Road, // get_foundation_proc
1872  TerraformTile_Road, // terraform_tile_proc
1873 };