OpenTTD
road_cmd.cpp
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1 /* $Id: road_cmd.cpp 27186 2015-03-14 14:27:07Z michi_cc $ */
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 * _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. */
241  RoadType other_rt = (rt == ROADTYPE_ROAD) ? ROADTYPE_TRAM : ROADTYPE_ROAD;
242  Owner other_owner = GetRoadOwner(tile, other_rt);
243  if (other_owner != GetTileOwner(tile)) {
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) c->infrastructure.rail[GetRailType(tile)] -= LEVELCROSSING_TRACKBIT_FACTOR - 1;
388  } else {
389  SetRoadTypes(tile, rts);
390  }
391  MarkTileDirtyByTile(tile);
392  YapfNotifyTrackLayoutChange(tile, railtrack);
393  }
394  return CommandCost(EXPENSES_CONSTRUCTION, _price[PR_CLEAR_ROAD] * 2);
395  }
396 
397  default:
398  case ROAD_TILE_DEPOT:
399  return CMD_ERROR;
400  }
401 }
402 
403 
415 static CommandCost CheckRoadSlope(Slope tileh, RoadBits *pieces, RoadBits existing, RoadBits other)
416 {
417  /* Remove already build pieces */
418  CLRBITS(*pieces, existing);
419 
420  /* If we can't build anything stop here */
421  if (*pieces == ROAD_NONE) return CMD_ERROR;
422 
423  /* All RoadBit combos are valid on flat land */
424  if (tileh == SLOPE_FLAT) return CommandCost();
425 
426  /* Steep slopes behave the same as slopes with one corner raised. */
427  if (IsSteepSlope(tileh)) {
429  }
430 
431  /* Save the merge of all bits of the current type */
432  RoadBits type_bits = existing | *pieces;
433 
434  /* Roads on slopes */
435  if (_settings_game.construction.build_on_slopes && (_invalid_tileh_slopes_road[0][tileh] & (other | type_bits)) == ROAD_NONE) {
436 
437  /* If we add leveling we've got to pay for it */
438  if ((other | existing) == ROAD_NONE) return CommandCost(EXPENSES_CONSTRUCTION, _price[PR_BUILD_FOUNDATION]);
439 
440  return CommandCost();
441  }
442 
443  /* Autocomplete uphill roads */
444  *pieces |= MirrorRoadBits(*pieces);
445  type_bits = existing | *pieces;
446 
447  /* Uphill roads */
448  if (IsStraightRoad(type_bits) && (other == type_bits || other == ROAD_NONE) &&
449  (_invalid_tileh_slopes_road[1][tileh] & (other | type_bits)) == ROAD_NONE) {
450 
451  /* Slopes with foundation ? */
452  if (IsSlopeWithOneCornerRaised(tileh)) {
453 
454  /* Prevent build on slopes if it isn't allowed */
456 
457  /* If we add foundation we've got to pay for it */
458  if ((other | existing) == ROAD_NONE) return CommandCost(EXPENSES_CONSTRUCTION, _price[PR_BUILD_FOUNDATION]);
459 
460  return CommandCost();
461  }
462  } else {
463  if (HasExactlyOneBit(existing) && GetRoadFoundation(tileh, existing) == FOUNDATION_NONE) return CommandCost(EXPENSES_CONSTRUCTION, _price[PR_BUILD_FOUNDATION]);
464  return CommandCost();
465  }
466  }
467  return CMD_ERROR;
468 }
469 
481 CommandCost CmdBuildRoad(TileIndex tile, DoCommandFlag flags, uint32 p1, uint32 p2, const char *text)
482 {
483  CompanyID company = _current_company;
485 
486  RoadBits existing = ROAD_NONE;
487  RoadBits other_bits = ROAD_NONE;
488 
489  /* Road pieces are max 4 bitset values (NE, NW, SE, SW) and town can only be non-zero
490  * if a non-company is building the road */
491  if ((Company::IsValidID(company) && p2 != 0) || (company == OWNER_TOWN && !Town::IsValidID(p2)) || (company == OWNER_DEITY && p2 != 0)) return CMD_ERROR;
492  if (company != OWNER_TOWN) {
493  const Town *town = CalcClosestTownFromTile(tile);
494  p2 = (town != NULL) ? town->index : (TownID)INVALID_TOWN;
495 
496  if (company == OWNER_DEITY) {
497  company = OWNER_TOWN;
498 
499  /* If we are not within a town, we are not owned by the town */
500  if (town == NULL || DistanceSquare(tile, town->xy) > town->cache.squared_town_zone_radius[HZB_TOWN_EDGE]) {
501  company = OWNER_NONE;
502  }
503  }
504  }
505 
506  RoadBits pieces = Extract<RoadBits, 0, 4>(p1);
507 
508  /* do not allow building 'zero' road bits, code wouldn't handle it */
509  if (pieces == ROAD_NONE) return CMD_ERROR;
510 
511  RoadType rt = Extract<RoadType, 4, 2>(p1);
512  if (!IsValidRoadType(rt) || !ValParamRoadType(rt)) return CMD_ERROR;
513 
514  DisallowedRoadDirections toggle_drd = Extract<DisallowedRoadDirections, 6, 2>(p1);
515 
516  Slope tileh = GetTileSlope(tile);
517 
518  bool need_to_clear = false;
519  switch (GetTileType(tile)) {
520  case MP_ROAD:
521  switch (GetRoadTileType(tile)) {
522  case ROAD_TILE_NORMAL: {
523  if (HasRoadWorks(tile)) return_cmd_error(STR_ERROR_ROAD_WORKS_IN_PROGRESS);
524 
525  other_bits = GetOtherRoadBits(tile, rt);
526  if (!HasTileRoadType(tile, rt)) break;
527 
528  existing = GetRoadBits(tile, rt);
529  bool crossing = !IsStraightRoad(existing | pieces);
530  if (rt != ROADTYPE_TRAM && (GetDisallowedRoadDirections(tile) != DRD_NONE || toggle_drd != DRD_NONE) && crossing) {
531  /* Junctions cannot be one-way */
532  return_cmd_error(STR_ERROR_ONEWAY_ROADS_CAN_T_HAVE_JUNCTION);
533  }
534  if ((existing & pieces) == pieces) {
535  /* We only want to set the (dis)allowed road directions */
536  if (toggle_drd != DRD_NONE && rt != ROADTYPE_TRAM) {
537  if (crossing) return_cmd_error(STR_ERROR_ONEWAY_ROADS_CAN_T_HAVE_JUNCTION);
538 
540  if (owner != OWNER_NONE) {
541  CommandCost ret = CheckOwnership(owner, tile);
542  if (ret.Failed()) return ret;
543  }
544 
546  DisallowedRoadDirections dis_new = dis_existing ^ toggle_drd;
547 
548  /* We allow removing disallowed directions to break up
549  * deadlocks, but adding them can break articulated
550  * vehicles. As such, only when less is disallowed,
551  * i.e. bits are removed, we skip the vehicle check. */
552  if (CountBits(dis_existing) <= CountBits(dis_new)) {
554  if (ret.Failed()) return ret;
555  }
556 
557  /* Ignore half built tiles */
558  if ((flags & DC_EXEC) && rt != ROADTYPE_TRAM && IsStraightRoad(existing)) {
559  SetDisallowedRoadDirections(tile, dis_new);
560  MarkTileDirtyByTile(tile);
561  }
562  return CommandCost();
563  }
564  return_cmd_error(STR_ERROR_ALREADY_BUILT);
565  }
566  break;
567  }
568 
569  case ROAD_TILE_CROSSING:
570  other_bits = GetCrossingRoadBits(tile);
571  if (pieces & ComplementRoadBits(other_bits)) goto do_clear;
572  pieces = other_bits; // we need to pay for both roadbits
573 
574  if (HasTileRoadType(tile, rt)) return_cmd_error(STR_ERROR_ALREADY_BUILT);
575  break;
576 
577  case ROAD_TILE_DEPOT:
578  if ((GetAnyRoadBits(tile, rt) & pieces) == pieces) return_cmd_error(STR_ERROR_ALREADY_BUILT);
579  goto do_clear;
580 
581  default: NOT_REACHED();
582  }
583  break;
584 
585  case MP_RAILWAY: {
586  if (IsSteepSlope(tileh)) {
587  return_cmd_error(STR_ERROR_LAND_SLOPED_IN_WRONG_DIRECTION);
588  }
589 
590  /* Level crossings may only be built on these slopes */
591  if (!HasBit(VALID_LEVEL_CROSSING_SLOPES, tileh)) {
592  return_cmd_error(STR_ERROR_LAND_SLOPED_IN_WRONG_DIRECTION);
593  }
594 
595  if (GetRailTileType(tile) != RAIL_TILE_NORMAL) goto do_clear;
596 
597  if (RailNoLevelCrossings(GetRailType(tile))) {
598  return_cmd_error(STR_ERROR_CROSSING_DISALLOWED);
599  }
600 
601  Axis roaddir;
602  switch (GetTrackBits(tile)) {
603  case TRACK_BIT_X:
604  if (pieces & ROAD_X) goto do_clear;
605  roaddir = AXIS_Y;
606  break;
607 
608  case TRACK_BIT_Y:
609  if (pieces & ROAD_Y) goto do_clear;
610  roaddir = AXIS_X;
611  break;
612 
613  default: goto do_clear;
614  }
615 
617  if (ret.Failed()) return ret;
618 
619  if (flags & DC_EXEC) {
620  Track railtrack = AxisToTrack(OtherAxis(roaddir));
621  YapfNotifyTrackLayoutChange(tile, railtrack);
622  /* Update company infrastructure counts. A level crossing has two road bits. */
623  Company *c = Company::GetIfValid(company);
624  if (c != NULL) {
625  c->infrastructure.road[rt] += 2;
626  if (rt != ROADTYPE_ROAD) c->infrastructure.road[ROADTYPE_ROAD] += 2;
628  }
629  /* Update rail count for level crossings. The plain track is already
630  * counted, so only add the difference to the level crossing cost. */
632  if (c != NULL) c->infrastructure.rail[GetRailType(tile)] += LEVELCROSSING_TRACKBIT_FACTOR - 1;
633 
634  /* Always add road to the roadtypes (can't draw without it) */
635  bool reserved = HasBit(GetRailReservationTrackBits(tile), railtrack);
636  MakeRoadCrossing(tile, company, company, GetTileOwner(tile), roaddir, GetRailType(tile), RoadTypeToRoadTypes(rt) | ROADTYPES_ROAD, p2);
637  SetCrossingReservation(tile, reserved);
638  UpdateLevelCrossing(tile, false);
639  MarkTileDirtyByTile(tile);
640  }
641  return CommandCost(EXPENSES_CONSTRUCTION, _price[PR_BUILD_ROAD] * (rt == ROADTYPE_ROAD ? 2 : 4));
642  }
643 
644  case MP_STATION: {
645  if ((GetAnyRoadBits(tile, rt) & pieces) == pieces) return_cmd_error(STR_ERROR_ALREADY_BUILT);
646  if (!IsDriveThroughStopTile(tile)) goto do_clear;
647 
649  if (pieces & ~curbits) goto do_clear;
650  pieces = curbits; // we need to pay for both roadbits
651 
652  if (HasTileRoadType(tile, rt)) return_cmd_error(STR_ERROR_ALREADY_BUILT);
653  break;
654  }
655 
656  case MP_TUNNELBRIDGE: {
657  if (GetTunnelBridgeTransportType(tile) != TRANSPORT_ROAD) goto do_clear;
658  /* Only allow building the outern roadbit, so building long roads stops at existing bridges */
659  if (MirrorRoadBits(DiagDirToRoadBits(GetTunnelBridgeDirection(tile))) != pieces) goto do_clear;
660  if (HasTileRoadType(tile, rt)) return_cmd_error(STR_ERROR_ALREADY_BUILT);
661  /* Don't allow adding roadtype to the bridge/tunnel when vehicles are already driving on it */
663  if (ret.Failed()) return ret;
664  break;
665  }
666 
667  default: {
668 do_clear:;
669  need_to_clear = true;
670  break;
671  }
672  }
673 
674  if (need_to_clear) {
675  CommandCost ret = DoCommand(tile, 0, 0, flags, CMD_LANDSCAPE_CLEAR);
676  if (ret.Failed()) return ret;
677  cost.AddCost(ret);
678  }
679 
680  if (other_bits != pieces) {
681  /* Check the foundation/slopes when adding road/tram bits */
682  CommandCost ret = CheckRoadSlope(tileh, &pieces, existing, other_bits);
683  /* Return an error if we need to build a foundation (ret != 0) but the
684  * current setting is turned off */
685  if (ret.Failed() || (ret.GetCost() != 0 && !_settings_game.construction.build_on_slopes)) {
686  return_cmd_error(STR_ERROR_LAND_SLOPED_IN_WRONG_DIRECTION);
687  }
688  cost.AddCost(ret);
689  }
690 
691  if (!need_to_clear) {
692  if (IsTileType(tile, MP_ROAD)) {
693  /* Don't put the pieces that already exist */
694  pieces &= ComplementRoadBits(existing);
695 
696  /* Check if new road bits will have the same foundation as other existing road types */
697  if (IsNormalRoad(tile)) {
698  Slope slope = GetTileSlope(tile);
699  Foundation found_new = GetRoadFoundation(slope, pieces | existing);
700 
701  /* Test if all other roadtypes can be built at that foundation */
702  for (RoadType rtest = ROADTYPE_ROAD; rtest < ROADTYPE_END; rtest++) {
703  if (rtest != rt) { // check only other road types
704  RoadBits bits = GetRoadBits(tile, rtest);
705  /* do not check if there are not road bits of given type */
706  if (bits != ROAD_NONE && GetRoadFoundation(slope, bits) != found_new) {
707  return_cmd_error(STR_ERROR_LAND_SLOPED_IN_WRONG_DIRECTION);
708  }
709  }
710  }
711  }
712  }
713 
715  if (ret.Failed()) return ret;
716 
717  }
718 
719  uint num_pieces = (!need_to_clear && IsTileType(tile, MP_TUNNELBRIDGE)) ?
720  /* There are 2 pieces on *every* tile of the bridge or tunnel */
721  2 * (GetTunnelBridgeLength(GetOtherTunnelBridgeEnd(tile), tile) + 2) :
722  /* Count pieces */
723  CountBits(pieces);
724 
725  cost.AddCost(num_pieces * _price[PR_BUILD_ROAD]);
726 
727  if (flags & DC_EXEC) {
728  switch (GetTileType(tile)) {
729  case MP_ROAD: {
730  RoadTileType rtt = GetRoadTileType(tile);
731  if (existing == ROAD_NONE || rtt == ROAD_TILE_CROSSING) {
732  SetRoadTypes(tile, GetRoadTypes(tile) | RoadTypeToRoadTypes(rt));
733  SetRoadOwner(tile, rt, company);
734  if (rt == ROADTYPE_ROAD) SetTownIndex(tile, p2);
735  }
736  if (rtt != ROAD_TILE_CROSSING) SetRoadBits(tile, existing | pieces, rt);
737  break;
738  }
739 
740  case MP_TUNNELBRIDGE: {
741  TileIndex other_end = GetOtherTunnelBridgeEnd(tile);
742 
743  SetRoadTypes(other_end, GetRoadTypes(other_end) | RoadTypeToRoadTypes(rt));
744  SetRoadTypes(tile, GetRoadTypes(tile) | RoadTypeToRoadTypes(rt));
745  SetRoadOwner(other_end, rt, company);
746  SetRoadOwner(tile, rt, company);
747 
748  /* Mark tiles dirty that have been repaved */
749  if (IsBridge(tile)) {
750  MarkBridgeDirty(tile);
751  } else {
752  MarkTileDirtyByTile(other_end);
753  MarkTileDirtyByTile(tile);
754  }
755  break;
756  }
757 
758  case MP_STATION:
759  assert(IsDriveThroughStopTile(tile));
760  SetRoadTypes(tile, GetRoadTypes(tile) | RoadTypeToRoadTypes(rt));
761  SetRoadOwner(tile, rt, company);
762  break;
763 
764  default:
765  MakeRoadNormal(tile, pieces, RoadTypeToRoadTypes(rt), p2, company, company);
766  break;
767  }
768 
769  /* Update company infrastructure count. */
770  Company *c = Company::GetIfValid(GetRoadOwner(tile, rt));
771  if (c != NULL) {
772  if (IsTileType(tile, MP_TUNNELBRIDGE)) num_pieces *= TUNNELBRIDGE_TRACKBIT_FACTOR;
773  c->infrastructure.road[rt] += num_pieces;
775  }
776 
777  if (rt != ROADTYPE_TRAM && IsNormalRoadTile(tile)) {
778  existing |= pieces;
780  GetDisallowedRoadDirections(tile) ^ toggle_drd : DRD_NONE);
781  }
782 
783  MarkTileDirtyByTile(tile);
784  }
785  return cost;
786 }
787 
796 {
797  RoadBits bits = GetAnyRoadBits(tile + TileOffsByDiagDir(dir), rt, false);
798  return (bits & DiagDirToRoadBits(ReverseDiagDir(dir))) != 0;
799 }
800 
818 CommandCost CmdBuildLongRoad(TileIndex start_tile, DoCommandFlag flags, uint32 p1, uint32 p2, const char *text)
819 {
821 
822  if (p1 >= MapSize()) return CMD_ERROR;
823 
824  TileIndex end_tile = p1;
825  RoadType rt = Extract<RoadType, 3, 2>(p2);
826  if (!IsValidRoadType(rt) || !ValParamRoadType(rt)) return CMD_ERROR;
827 
828  Axis axis = Extract<Axis, 2, 1>(p2);
829  /* Only drag in X or Y direction dictated by the direction variable */
830  if (axis == AXIS_X && TileY(start_tile) != TileY(end_tile)) return CMD_ERROR; // x-axis
831  if (axis == AXIS_Y && TileX(start_tile) != TileX(end_tile)) return CMD_ERROR; // y-axis
832 
833  DiagDirection dir = AxisToDiagDir(axis);
834 
835  /* Swap direction, also the half-tile drag var (bit 0 and 1) */
836  if (start_tile > end_tile || (start_tile == end_tile && HasBit(p2, 0))) {
837  dir = ReverseDiagDir(dir);
838  p2 ^= 3;
839  drd = DRD_SOUTHBOUND;
840  }
841 
842  /* On the X-axis, we have to swap the initial bits, so they
843  * will be interpreted correctly in the GTTS. Furthermore
844  * when you just 'click' on one tile to build them. */
845  if ((axis == AXIS_Y) == (start_tile == end_tile && HasBit(p2, 0) == HasBit(p2, 1))) drd ^= DRD_BOTH;
846  /* No disallowed direction bits have to be toggled */
847  if (!HasBit(p2, 5)) drd = DRD_NONE;
848 
850  CommandCost last_error = CMD_ERROR;
851  TileIndex tile = start_tile;
852  bool had_bridge = false;
853  bool had_tunnel = false;
854  bool had_success = false;
855  bool is_ai = HasBit(p2, 6);
856 
857  /* Start tile is the first tile clicked by the user. */
858  for (;;) {
859  RoadBits bits = AxisToRoadBits(axis);
860 
861  /* Determine which road parts should be built. */
862  if (!is_ai && start_tile != end_tile) {
863  /* Only build the first and last roadbit if they can connect to something. */
864  if (tile == end_tile && !CanConnectToRoad(tile, rt, dir)) {
865  bits = DiagDirToRoadBits(ReverseDiagDir(dir));
866  } else if (tile == start_tile && !CanConnectToRoad(tile, rt, ReverseDiagDir(dir))) {
867  bits = DiagDirToRoadBits(dir);
868  }
869  } else {
870  /* Road parts only have to be built at the start tile or at the end tile. */
871  if (tile == end_tile && !HasBit(p2, 1)) bits &= DiagDirToRoadBits(ReverseDiagDir(dir));
872  if (tile == start_tile && HasBit(p2, 0)) bits &= DiagDirToRoadBits(dir);
873  }
874 
875  CommandCost ret = DoCommand(tile, drd << 6 | rt << 4 | bits, 0, flags, CMD_BUILD_ROAD);
876  if (ret.Failed()) {
877  last_error = ret;
878  if (last_error.GetErrorMessage() != STR_ERROR_ALREADY_BUILT) {
879  if (is_ai) return last_error;
880  break;
881  }
882  } else {
883  had_success = true;
884  /* Only pay for the upgrade on one side of the bridges and tunnels */
885  if (IsTileType(tile, MP_TUNNELBRIDGE)) {
886  if (IsBridge(tile)) {
887  if (!had_bridge || GetTunnelBridgeDirection(tile) == dir) {
888  cost.AddCost(ret);
889  }
890  had_bridge = true;
891  } else { // IsTunnel(tile)
892  if (!had_tunnel || GetTunnelBridgeDirection(tile) == dir) {
893  cost.AddCost(ret);
894  }
895  had_tunnel = true;
896  }
897  } else {
898  cost.AddCost(ret);
899  }
900  }
901 
902  if (tile == end_tile) break;
903 
904  tile += TileOffsByDiagDir(dir);
905  }
906 
907  return had_success ? cost : last_error;
908 }
909 
923 CommandCost CmdRemoveLongRoad(TileIndex start_tile, DoCommandFlag flags, uint32 p1, uint32 p2, const char *text)
924 {
926 
927  if (p1 >= MapSize()) return CMD_ERROR;
928 
929  TileIndex end_tile = p1;
930  RoadType rt = Extract<RoadType, 3, 2>(p2);
931  if (!IsValidRoadType(rt)) return CMD_ERROR;
932 
933  Axis axis = Extract<Axis, 2, 1>(p2);
934  /* Only drag in X or Y direction dictated by the direction variable */
935  if (axis == AXIS_X && TileY(start_tile) != TileY(end_tile)) return CMD_ERROR; // x-axis
936  if (axis == AXIS_Y && TileX(start_tile) != TileX(end_tile)) return CMD_ERROR; // y-axis
937 
938  /* Swap start and ending tile, also the half-tile drag var (bit 0 and 1) */
939  if (start_tile > end_tile || (start_tile == end_tile && HasBit(p2, 0))) {
940  TileIndex t = start_tile;
941  start_tile = end_tile;
942  end_tile = t;
943  p2 ^= IsInsideMM(p2 & 3, 1, 3) ? 3 : 0;
944  }
945 
947  TileIndex tile = start_tile;
948  CommandCost last_error = CMD_ERROR;
949  bool had_success = false;
950  /* Start tile is the small number. */
951  for (;;) {
952  RoadBits bits = AxisToRoadBits(axis);
953 
954  if (tile == end_tile && !HasBit(p2, 1)) bits &= ROAD_NW | ROAD_NE;
955  if (tile == start_tile && HasBit(p2, 0)) bits &= ROAD_SE | ROAD_SW;
956 
957  /* try to remove the halves. */
958  if (bits != 0) {
959  CommandCost ret = RemoveRoad(tile, flags & ~DC_EXEC, bits, rt, true);
960  if (ret.Succeeded()) {
961  if (flags & DC_EXEC) {
962  money -= ret.GetCost();
963  if (money < 0) {
964  _additional_cash_required = DoCommand(start_tile, end_tile, p2, flags & ~DC_EXEC, CMD_REMOVE_LONG_ROAD).GetCost();
965  return cost;
966  }
967  RemoveRoad(tile, flags, bits, rt, true, false);
968  }
969  cost.AddCost(ret);
970  had_success = true;
971  } else {
972  /* Ownership errors are more important. */
973  if (last_error.GetErrorMessage() != STR_ERROR_OWNED_BY) last_error = ret;
974  }
975  }
976 
977  if (tile == end_tile) break;
978 
979  tile += (axis == AXIS_Y) ? TileDiffXY(0, 1) : TileDiffXY(1, 0);
980  }
981 
982  return had_success ? cost : last_error;
983 }
984 
998 CommandCost CmdBuildRoadDepot(TileIndex tile, DoCommandFlag flags, uint32 p1, uint32 p2, const char *text)
999 {
1000  DiagDirection dir = Extract<DiagDirection, 0, 2>(p1);
1001  RoadType rt = Extract<RoadType, 2, 2>(p1);
1002 
1003  if (!IsValidRoadType(rt) || !ValParamRoadType(rt)) return CMD_ERROR;
1004 
1005  Slope tileh = GetTileSlope(tile);
1006  if (tileh != SLOPE_FLAT && (
1008  !CanBuildDepotByTileh(dir, tileh)
1009  )) {
1010  return_cmd_error(STR_ERROR_FLAT_LAND_REQUIRED);
1011  }
1012 
1013  CommandCost cost = DoCommand(tile, 0, 0, flags, CMD_LANDSCAPE_CLEAR);
1014  if (cost.Failed()) return cost;
1015 
1016  if (IsBridgeAbove(tile)) return_cmd_error(STR_ERROR_MUST_DEMOLISH_BRIDGE_FIRST);
1017 
1018  if (!Depot::CanAllocateItem()) return CMD_ERROR;
1019 
1020  if (flags & DC_EXEC) {
1021  Depot *dep = new Depot(tile);
1022  dep->build_date = _date;
1023 
1024  /* A road depot has two road bits. */
1025  Company::Get(_current_company)->infrastructure.road[rt] += 2;
1027 
1028  MakeRoadDepot(tile, _current_company, dep->index, dir, rt);
1029  MarkTileDirtyByTile(tile);
1030  MakeDefaultName(dep);
1031  }
1032  cost.AddCost(_price[PR_BUILD_DEPOT_ROAD]);
1033  return cost;
1034 }
1035 
1036 static CommandCost RemoveRoadDepot(TileIndex tile, DoCommandFlag flags)
1037 {
1038  if (_current_company != OWNER_WATER) {
1039  CommandCost ret = CheckTileOwnership(tile);
1040  if (ret.Failed()) return ret;
1041  }
1042 
1044  if (ret.Failed()) return ret;
1045 
1046  if (flags & DC_EXEC) {
1048  if (c != NULL) {
1049  /* A road depot has two road bits. */
1052  }
1053 
1054  delete Depot::GetByTile(tile);
1055  DoClearSquare(tile);
1056  }
1057 
1058  return CommandCost(EXPENSES_CONSTRUCTION, _price[PR_CLEAR_DEPOT_ROAD]);
1059 }
1060 
1061 static CommandCost ClearTile_Road(TileIndex tile, DoCommandFlag flags)
1062 {
1063  switch (GetRoadTileType(tile)) {
1064  case ROAD_TILE_NORMAL: {
1065  RoadBits b = GetAllRoadBits(tile);
1066 
1067  /* Clear the road if only one piece is on the tile OR we are not using the DC_AUTO flag */
1068  if ((HasExactlyOneBit(b) && GetRoadBits(tile, ROADTYPE_TRAM) == ROAD_NONE) || !(flags & DC_AUTO)) {
1070  RoadType rt;
1071  FOR_EACH_SET_ROADTYPE(rt, GetRoadTypes(tile)) {
1072  CommandCost tmp_ret = RemoveRoad(tile, flags, GetRoadBits(tile, rt), rt, true);
1073  if (tmp_ret.Failed()) return tmp_ret;
1074  ret.AddCost(tmp_ret);
1075  }
1076  return ret;
1077  }
1078  return_cmd_error(STR_ERROR_MUST_REMOVE_ROAD_FIRST);
1079  }
1080 
1081  case ROAD_TILE_CROSSING: {
1082  RoadTypes rts = GetRoadTypes(tile);
1084 
1085  if (flags & DC_AUTO) return_cmd_error(STR_ERROR_MUST_REMOVE_ROAD_FIRST);
1086 
1087  /* Must iterate over the roadtypes in a reverse manner because
1088  * tram tracks must be removed before the road bits. */
1089  RoadType rt = ROADTYPE_TRAM;
1090  do {
1091  if (HasBit(rts, rt)) {
1092  CommandCost tmp_ret = RemoveRoad(tile, flags, GetCrossingRoadBits(tile), rt, false);
1093  if (tmp_ret.Failed()) return tmp_ret;
1094  ret.AddCost(tmp_ret);
1095  }
1096  } while (rt-- != ROADTYPE_ROAD);
1097 
1098  if (flags & DC_EXEC) {
1099  DoCommand(tile, 0, 0, flags, CMD_LANDSCAPE_CLEAR);
1100  }
1101  return ret;
1102  }
1103 
1104  default:
1105  case ROAD_TILE_DEPOT:
1106  if (flags & DC_AUTO) {
1107  return_cmd_error(STR_ERROR_BUILDING_MUST_BE_DEMOLISHED);
1108  }
1109  return RemoveRoadDepot(tile, flags);
1110  }
1111 }
1112 
1113 
1115  uint16 image;
1116  byte subcoord_x;
1117  byte subcoord_y;
1118 };
1119 
1120 #include "table/road_land.h"
1121 
1130 {
1131  /* Flat land and land without a road doesn't require a foundation */
1132  if (tileh == SLOPE_FLAT || bits == ROAD_NONE) return FOUNDATION_NONE;
1133 
1134  /* Steep slopes behave the same as slopes with one corner raised. */
1135  if (IsSteepSlope(tileh)) {
1137  }
1138 
1139  /* Leveled RoadBits on a slope */
1140  if ((_invalid_tileh_slopes_road[0][tileh] & bits) == ROAD_NONE) return FOUNDATION_LEVELED;
1141 
1142  /* Straight roads without foundation on a slope */
1143  if (!IsSlopeWithOneCornerRaised(tileh) &&
1144  (_invalid_tileh_slopes_road[1][tileh] & bits) == ROAD_NONE)
1145  return FOUNDATION_NONE;
1146 
1147  /* Roads on steep Slopes or on Slopes with one corner raised */
1148  return (bits == ROAD_X ? FOUNDATION_INCLINED_X : FOUNDATION_INCLINED_Y);
1149 }
1150 
1151 const byte _road_sloped_sprites[14] = {
1152  0, 0, 2, 0,
1153  0, 1, 0, 0,
1154  3, 0, 0, 0,
1155  0, 0
1156 };
1157 
1167 static bool DrawRoadAsSnowDesert(TileIndex tile, Roadside roadside)
1168 {
1169  return (IsOnSnow(tile) &&
1170  !(_settings_game.game_creation.landscape == LT_TROPIC && HasGrfMiscBit(GMB_DESERT_PAVED_ROADS) &&
1171  roadside != ROADSIDE_BARREN && roadside != ROADSIDE_GRASS && roadside != ROADSIDE_GRASS_ROAD_WORKS));
1172 }
1173 
1179 void DrawTramCatenary(const TileInfo *ti, RoadBits tram)
1180 {
1181  /* Do not draw catenary if it is invisible */
1182  if (IsInvisibilitySet(TO_CATENARY)) return;
1183 
1184  /* Don't draw the catenary under a low bridge */
1186  int height = GetBridgeHeight(GetNorthernBridgeEnd(ti->tile));
1187 
1188  if (height <= GetTileMaxZ(ti->tile) + 1) return;
1189  }
1190 
1191  SpriteID front;
1192  SpriteID back;
1193 
1194  if (ti->tileh != SLOPE_FLAT) {
1195  back = SPR_TRAMWAY_BACK_WIRES_SLOPED + _road_sloped_sprites[ti->tileh - 1];
1196  front = SPR_TRAMWAY_FRONT_WIRES_SLOPED + _road_sloped_sprites[ti->tileh - 1];
1197  } else {
1198  back = SPR_TRAMWAY_BASE + _road_backpole_sprites_1[tram];
1199  front = SPR_TRAMWAY_BASE + _road_frontwire_sprites_1[tram];
1200  }
1201 
1202  AddSortableSpriteToDraw(back, PAL_NONE, ti->x, ti->y, 16, 16, TILE_HEIGHT + BB_HEIGHT_UNDER_BRIDGE, ti->z, IsTransparencySet(TO_CATENARY));
1203  AddSortableSpriteToDraw(front, PAL_NONE, ti->x, ti->y, 16, 16, TILE_HEIGHT + BB_HEIGHT_UNDER_BRIDGE, ti->z, IsTransparencySet(TO_CATENARY));
1204 }
1205 
1214 static void DrawRoadDetail(SpriteID img, const TileInfo *ti, int dx, int dy, int h)
1215 {
1216  int x = ti->x | dx;
1217  int y = ti->y | dy;
1218  int z = ti->z;
1219  if (ti->tileh != SLOPE_FLAT) z = GetSlopePixelZ(x, y);
1220  AddSortableSpriteToDraw(img, PAL_NONE, x, y, 2, 2, h, z);
1221 }
1222 
1227 static void DrawRoadBits(TileInfo *ti)
1228 {
1229  RoadBits road = GetRoadBits(ti->tile, ROADTYPE_ROAD);
1230  RoadBits tram = GetRoadBits(ti->tile, ROADTYPE_TRAM);
1231 
1232  SpriteID image = 0;
1233  PaletteID pal = PAL_NONE;
1234 
1235  if (ti->tileh != SLOPE_FLAT) {
1236  DrawFoundation(ti, GetRoadFoundation(ti->tileh, road | tram));
1237 
1238  /* DrawFoundation() modifies ti.
1239  * Default sloped sprites.. */
1240  if (ti->tileh != SLOPE_FLAT) image = _road_sloped_sprites[ti->tileh - 1] + SPR_ROAD_SLOPE_START;
1241  }
1242 
1243  if (image == 0) image = _road_tile_sprites_1[road != ROAD_NONE ? road : tram];
1244 
1245  Roadside roadside = GetRoadside(ti->tile);
1246 
1247  if (DrawRoadAsSnowDesert(ti->tile, roadside)) {
1248  image += 19;
1249  } else {
1250  switch (roadside) {
1251  case ROADSIDE_BARREN: pal = PALETTE_TO_BARE_LAND; break;
1252  case ROADSIDE_GRASS: break;
1253  case ROADSIDE_GRASS_ROAD_WORKS: break;
1254  default: image -= 19; break; // Paved
1255  }
1256  }
1257 
1258  DrawGroundSprite(image, pal);
1259 
1260  /* For tram we overlay the road graphics with either tram tracks only
1261  * (when there is actual road beneath the trams) or with tram tracks
1262  * and some dirts which hides the road graphics */
1263  if (tram != ROAD_NONE) {
1264  if (ti->tileh != SLOPE_FLAT) {
1265  image = _road_sloped_sprites[ti->tileh - 1] + SPR_TRAMWAY_SLOPED_OFFSET;
1266  } else {
1267  image = _road_tile_sprites_1[tram] - SPR_ROAD_Y;
1268  }
1269  image += (road == ROAD_NONE) ? SPR_TRAMWAY_TRAM : SPR_TRAMWAY_OVERLAY;
1270  DrawGroundSprite(image, pal);
1271  }
1272 
1273  if (road != ROAD_NONE) {
1275  if (drd != DRD_NONE) {
1276  DrawGroundSpriteAt(SPR_ONEWAY_BASE + drd - 1 + ((road == ROAD_X) ? 0 : 3), PAL_NONE, 8, 8, GetPartialPixelZ(8, 8, ti->tileh));
1277  }
1278  }
1279 
1280  if (HasRoadWorks(ti->tile)) {
1281  /* Road works */
1282  DrawGroundSprite((road | tram) & ROAD_X ? SPR_EXCAVATION_X : SPR_EXCAVATION_Y, PAL_NONE);
1283  return;
1284  }
1285 
1286  if (tram != ROAD_NONE) DrawTramCatenary(ti, tram);
1287 
1288  /* Return if full detail is disabled, or we are zoomed fully out. */
1289  if (!HasBit(_display_opt, DO_FULL_DETAIL) || _cur_dpi->zoom > ZOOM_LVL_DETAIL) return;
1290 
1291  /* Do not draw details (street lights, trees) under low bridge */
1292  if (IsBridgeAbove(ti->tile) && (roadside == ROADSIDE_TREES || roadside == ROADSIDE_STREET_LIGHTS)) {
1293  int height = GetBridgeHeight(GetNorthernBridgeEnd(ti->tile));
1294  int minz = GetTileMaxZ(ti->tile) + 2;
1295 
1296  if (roadside == ROADSIDE_TREES) minz++;
1297 
1298  if (height < minz) return;
1299  }
1300 
1301  /* If there are no road bits, return, as there is nothing left to do */
1302  if (HasAtMostOneBit(road)) return;
1303 
1304  /* Draw extra details. */
1305  for (const DrawRoadTileStruct *drts = _road_display_table[roadside][road | tram]; drts->image != 0; drts++) {
1306  DrawRoadDetail(drts->image, ti, drts->subcoord_x, drts->subcoord_y, 0x10);
1307  }
1308 }
1309 
1311 static void DrawTile_Road(TileInfo *ti)
1312 {
1313  switch (GetRoadTileType(ti->tile)) {
1314  case ROAD_TILE_NORMAL:
1315  DrawRoadBits(ti);
1316  break;
1317 
1318  case ROAD_TILE_CROSSING: {
1320 
1321  PaletteID pal = PAL_NONE;
1322  const RailtypeInfo *rti = GetRailTypeInfo(GetRailType(ti->tile));
1323 
1324  if (rti->UsesOverlay()) {
1325  Axis axis = GetCrossingRailAxis(ti->tile);
1326  SpriteID road = SPR_ROAD_Y + axis;
1327 
1328  Roadside roadside = GetRoadside(ti->tile);
1329 
1330  if (DrawRoadAsSnowDesert(ti->tile, roadside)) {
1331  road += 19;
1332  } else {
1333  switch (roadside) {
1334  case ROADSIDE_BARREN: pal = PALETTE_TO_BARE_LAND; break;
1335  case ROADSIDE_GRASS: break;
1336  default: road -= 19; break; // Paved
1337  }
1338  }
1339 
1340  DrawGroundSprite(road, pal);
1341 
1342  SpriteID rail = GetCustomRailSprite(rti, ti->tile, RTSG_CROSSING) + axis;
1343  /* Draw tracks, but draw PBS reserved tracks darker. */
1344  pal = (_game_mode != GM_MENU && _settings_client.gui.show_track_reservation && HasCrossingReservation(ti->tile)) ? PALETTE_CRASH : PAL_NONE;
1345  DrawGroundSprite(rail, pal);
1346 
1347  DrawRailTileSeq(ti, &_crossing_layout, TO_CATENARY, rail, 0, PAL_NONE);
1348  } else {
1349  SpriteID image = rti->base_sprites.crossing;
1350 
1351  if (GetCrossingRoadAxis(ti->tile) == AXIS_X) image++;
1352  if (IsCrossingBarred(ti->tile)) image += 2;
1353 
1354  Roadside roadside = GetRoadside(ti->tile);
1355 
1356  if (DrawRoadAsSnowDesert(ti->tile, roadside)) {
1357  image += 8;
1358  } else {
1359  switch (roadside) {
1360  case ROADSIDE_BARREN: pal = PALETTE_TO_BARE_LAND; break;
1361  case ROADSIDE_GRASS: break;
1362  default: image += 4; break; // Paved
1363  }
1364  }
1365 
1366  DrawGroundSprite(image, pal);
1367 
1368  /* PBS debugging, draw reserved tracks darker */
1369  if (_game_mode != GM_MENU && _settings_client.gui.show_track_reservation && HasCrossingReservation(ti->tile)) {
1371  }
1372  }
1373 
1374  if (HasTileRoadType(ti->tile, ROADTYPE_TRAM)) {
1375  DrawGroundSprite(SPR_TRAMWAY_OVERLAY + (GetCrossingRoadAxis(ti->tile) ^ 1), pal);
1377  }
1379  break;
1380  }
1381 
1382  default:
1383  case ROAD_TILE_DEPOT: {
1385 
1386  PaletteID palette = COMPANY_SPRITE_COLOUR(GetTileOwner(ti->tile));
1387 
1388  const DrawTileSprites *dts;
1389  if (HasTileRoadType(ti->tile, ROADTYPE_TRAM)) {
1390  dts = &_tram_depot[GetRoadDepotDirection(ti->tile)];
1391  } else {
1392  dts = &_road_depot[GetRoadDepotDirection(ti->tile)];
1393  }
1394 
1395  DrawGroundSprite(dts->ground.sprite, PAL_NONE);
1396  DrawOrigTileSeq(ti, dts, TO_BUILDINGS, palette);
1397  break;
1398  }
1399  }
1400  DrawBridgeMiddle(ti);
1401 }
1402 
1410 void DrawRoadDepotSprite(int x, int y, DiagDirection dir, RoadType rt)
1411 {
1412  PaletteID palette = COMPANY_SPRITE_COLOUR(_local_company);
1413  const DrawTileSprites *dts = (rt == ROADTYPE_TRAM) ? &_tram_depot[dir] : &_road_depot[dir];
1414 
1415  DrawSprite(dts->ground.sprite, PAL_NONE, x, y);
1416  DrawOrigTileSeqInGUI(x, y, dts, palette);
1417 }
1418 
1424 void UpdateNearestTownForRoadTiles(bool invalidate)
1425 {
1426  assert(!invalidate || _generating_world);
1427 
1428  for (TileIndex t = 0; t < MapSize(); t++) {
1429  if (IsTileType(t, MP_ROAD) && !IsRoadDepot(t) && !HasTownOwnedRoad(t)) {
1430  TownID tid = (TownID)INVALID_TOWN;
1431  if (!invalidate) {
1432  const Town *town = CalcClosestTownFromTile(t);
1433  if (town != NULL) tid = town->index;
1434  }
1435  SetTownIndex(t, tid);
1436  }
1437  }
1438 }
1439 
1440 static int GetSlopePixelZ_Road(TileIndex tile, uint x, uint y)
1441 {
1442 
1443  if (IsNormalRoad(tile)) {
1444  int z;
1445  Slope tileh = GetTilePixelSlope(tile, &z);
1446  if (tileh == SLOPE_FLAT) return z;
1447 
1448  Foundation f = GetRoadFoundation(tileh, GetAllRoadBits(tile));
1449  z += ApplyPixelFoundationToSlope(f, &tileh);
1450  return z + GetPartialPixelZ(x & 0xF, y & 0xF, tileh);
1451  } else {
1452  return GetTileMaxPixelZ(tile);
1453  }
1454 }
1455 
1456 static Foundation GetFoundation_Road(TileIndex tile, Slope tileh)
1457 {
1458  if (IsNormalRoad(tile)) {
1459  return GetRoadFoundation(tileh, GetAllRoadBits(tile));
1460  } else {
1461  return FlatteningFoundation(tileh);
1462  }
1463 }
1464 
1465 static const Roadside _town_road_types[][2] = {
1471 };
1472 
1473 static const Roadside _town_road_types_2[][2] = {
1479 };
1480 
1481 
1482 static void TileLoop_Road(TileIndex tile)
1483 {
1485  case LT_ARCTIC:
1486  if (IsOnSnow(tile) != (GetTileZ(tile) > GetSnowLine())) {
1487  ToggleSnow(tile);
1488  MarkTileDirtyByTile(tile);
1489  }
1490  break;
1491 
1492  case LT_TROPIC:
1493  if (GetTropicZone(tile) == TROPICZONE_DESERT && !IsOnDesert(tile)) {
1494  ToggleDesert(tile);
1495  MarkTileDirtyByTile(tile);
1496  }
1497  break;
1498  }
1499 
1500  if (IsRoadDepot(tile)) return;
1501 
1502  const Town *t = ClosestTownFromTile(tile, UINT_MAX);
1503  if (!HasRoadWorks(tile)) {
1504  HouseZonesBits grp = HZB_TOWN_EDGE;
1505 
1506  if (t != NULL) {
1507  grp = GetTownRadiusGroup(t, tile);
1508 
1509  /* Show an animation to indicate road work */
1510  if (t->road_build_months != 0 &&
1511  (DistanceManhattan(t->xy, tile) < 8 || grp != HZB_TOWN_EDGE) &&
1512  IsNormalRoad(tile) && !HasAtMostOneBit(GetAllRoadBits(tile))) {
1513  if (GetFoundationSlope(tile) == SLOPE_FLAT && EnsureNoVehicleOnGround(tile).Succeeded() && Chance16(1, 40)) {
1514  StartRoadWorks(tile);
1515 
1516  if (_settings_client.sound.ambient) SndPlayTileFx(SND_21_JACKHAMMER, tile);
1518  TileX(tile) * TILE_SIZE + 7,
1519  TileY(tile) * TILE_SIZE + 7,
1520  0,
1521  EV_BULLDOZER);
1522  MarkTileDirtyByTile(tile);
1523  return;
1524  }
1525  }
1526  }
1527 
1528  {
1529  /* Adjust road ground type depending on 'grp' (grp is the distance to the center) */
1530  const Roadside *new_rs = (_settings_game.game_creation.landscape == LT_TOYLAND) ? _town_road_types_2[grp] : _town_road_types[grp];
1531  Roadside cur_rs = GetRoadside(tile);
1532 
1533  /* We have our desired type, do nothing */
1534  if (cur_rs == new_rs[0]) return;
1535 
1536  /* We have the pre-type of the desired type, switch to the desired type */
1537  if (cur_rs == new_rs[1]) {
1538  cur_rs = new_rs[0];
1539  /* We have barren land, install the pre-type */
1540  } else if (cur_rs == ROADSIDE_BARREN) {
1541  cur_rs = new_rs[1];
1542  /* We're totally off limits, remove any installation and make barren land */
1543  } else {
1544  cur_rs = ROADSIDE_BARREN;
1545  }
1546  SetRoadside(tile, cur_rs);
1547  MarkTileDirtyByTile(tile);
1548  }
1549  } else if (IncreaseRoadWorksCounter(tile)) {
1550  TerminateRoadWorks(tile);
1551 
1553  /* Generate a nicer town surface */
1554  const RoadBits old_rb = GetAnyRoadBits(tile, ROADTYPE_ROAD);
1555  const RoadBits new_rb = CleanUpRoadBits(tile, old_rb);
1556 
1557  if (old_rb != new_rb) {
1558  RemoveRoad(tile, DC_EXEC | DC_AUTO | DC_NO_WATER, (old_rb ^ new_rb), ROADTYPE_ROAD, true);
1559  }
1560  }
1561 
1562  MarkTileDirtyByTile(tile);
1563  }
1564 }
1565 
1566 static bool ClickTile_Road(TileIndex tile)
1567 {
1568  if (!IsRoadDepot(tile)) return false;
1569 
1570  ShowDepotWindow(tile, VEH_ROAD);
1571  return true;
1572 }
1573 
1574 /* Converts RoadBits to TrackBits */
1575 static const TrackBits _road_trackbits[16] = {
1576  TRACK_BIT_NONE, // ROAD_NONE
1577  TRACK_BIT_NONE, // ROAD_NW
1578  TRACK_BIT_NONE, // ROAD_SW
1579  TRACK_BIT_LEFT, // ROAD_W
1580  TRACK_BIT_NONE, // ROAD_SE
1581  TRACK_BIT_Y, // ROAD_Y
1582  TRACK_BIT_LOWER, // ROAD_S
1583  TRACK_BIT_LEFT | TRACK_BIT_LOWER | TRACK_BIT_Y, // ROAD_Y | ROAD_SW
1584  TRACK_BIT_NONE, // ROAD_NE
1585  TRACK_BIT_UPPER, // ROAD_N
1586  TRACK_BIT_X, // ROAD_X
1587  TRACK_BIT_LEFT | TRACK_BIT_UPPER | TRACK_BIT_X, // ROAD_X | ROAD_NW
1588  TRACK_BIT_RIGHT, // ROAD_E
1589  TRACK_BIT_RIGHT | TRACK_BIT_UPPER | TRACK_BIT_Y, // ROAD_Y | ROAD_NE
1590  TRACK_BIT_RIGHT | TRACK_BIT_LOWER | TRACK_BIT_X, // ROAD_X | ROAD_SE
1591  TRACK_BIT_ALL, // ROAD_ALL
1592 };
1593 
1594 static TrackStatus GetTileTrackStatus_Road(TileIndex tile, TransportType mode, uint sub_mode, DiagDirection side)
1595 {
1596  TrackdirBits trackdirbits = TRACKDIR_BIT_NONE;
1597  TrackdirBits red_signals = TRACKDIR_BIT_NONE; // crossing barred
1598  switch (mode) {
1599  case TRANSPORT_RAIL:
1600  if (IsLevelCrossing(tile)) trackdirbits = TrackBitsToTrackdirBits(GetCrossingRailBits(tile));
1601  break;
1602 
1603  case TRANSPORT_ROAD:
1604  if ((GetRoadTypes(tile) & sub_mode) == 0) break;
1605  switch (GetRoadTileType(tile)) {
1606  case ROAD_TILE_NORMAL: {
1607  const uint drd_to_multiplier[DRD_END] = { 0x101, 0x100, 0x1, 0x0 };
1608  RoadType rt = (RoadType)FindFirstBit(sub_mode);
1609  RoadBits bits = GetRoadBits(tile, rt);
1610 
1611  /* no roadbit at this side of tile, return 0 */
1612  if (side != INVALID_DIAGDIR && (DiagDirToRoadBits(side) & bits) == 0) break;
1613 
1614  uint multiplier = drd_to_multiplier[rt == ROADTYPE_TRAM ? DRD_NONE : GetDisallowedRoadDirections(tile)];
1615  if (!HasRoadWorks(tile)) trackdirbits = (TrackdirBits)(_road_trackbits[bits] * multiplier);
1616  break;
1617  }
1618 
1619  case ROAD_TILE_CROSSING: {
1620  Axis axis = GetCrossingRoadAxis(tile);
1621 
1622  if (side != INVALID_DIAGDIR && axis != DiagDirToAxis(side)) break;
1623 
1624  trackdirbits = TrackBitsToTrackdirBits(AxisToTrackBits(axis));
1625  if (IsCrossingBarred(tile)) red_signals = trackdirbits;
1626  break;
1627  }
1628 
1629  default:
1630  case ROAD_TILE_DEPOT: {
1632 
1633  if (side != INVALID_DIAGDIR && side != dir) break;
1634 
1635  trackdirbits = TrackBitsToTrackdirBits(DiagDirToDiagTrackBits(dir));
1636  break;
1637  }
1638  }
1639  break;
1640 
1641  default: break;
1642  }
1643  return CombineTrackStatus(trackdirbits, red_signals);
1644 }
1645 
1646 static const StringID _road_tile_strings[] = {
1647  STR_LAI_ROAD_DESCRIPTION_ROAD,
1648  STR_LAI_ROAD_DESCRIPTION_ROAD,
1649  STR_LAI_ROAD_DESCRIPTION_ROAD,
1650  STR_LAI_ROAD_DESCRIPTION_ROAD_WITH_STREETLIGHTS,
1651  STR_LAI_ROAD_DESCRIPTION_ROAD,
1652  STR_LAI_ROAD_DESCRIPTION_TREE_LINED_ROAD,
1653  STR_LAI_ROAD_DESCRIPTION_ROAD,
1654  STR_LAI_ROAD_DESCRIPTION_ROAD,
1655 };
1656 
1657 static void GetTileDesc_Road(TileIndex tile, TileDesc *td)
1658 {
1659  Owner rail_owner = INVALID_OWNER;
1660  Owner road_owner = INVALID_OWNER;
1661  Owner tram_owner = INVALID_OWNER;
1662 
1663  switch (GetRoadTileType(tile)) {
1664  case ROAD_TILE_CROSSING: {
1665  td->str = STR_LAI_ROAD_DESCRIPTION_ROAD_RAIL_LEVEL_CROSSING;
1666  RoadTypes rts = GetRoadTypes(tile);
1667  rail_owner = GetTileOwner(tile);
1668  if (HasBit(rts, ROADTYPE_ROAD)) road_owner = GetRoadOwner(tile, ROADTYPE_ROAD);
1669  if (HasBit(rts, ROADTYPE_TRAM)) tram_owner = GetRoadOwner(tile, ROADTYPE_TRAM);
1670 
1671  const RailtypeInfo *rti = GetRailTypeInfo(GetRailType(tile));
1672  td->rail_speed = rti->max_speed;
1673 
1674  break;
1675  }
1676 
1677  case ROAD_TILE_DEPOT:
1678  td->str = STR_LAI_ROAD_DESCRIPTION_ROAD_VEHICLE_DEPOT;
1679  road_owner = GetTileOwner(tile); // Tile has only one owner, roadtype does not matter
1680  td->build_date = Depot::GetByTile(tile)->build_date;
1681  break;
1682 
1683  default: {
1684  RoadTypes rts = GetRoadTypes(tile);
1685  td->str = (HasBit(rts, ROADTYPE_ROAD) ? _road_tile_strings[GetRoadside(tile)] : STR_LAI_ROAD_DESCRIPTION_TRAMWAY);
1686  if (HasBit(rts, ROADTYPE_ROAD)) road_owner = GetRoadOwner(tile, ROADTYPE_ROAD);
1687  if (HasBit(rts, ROADTYPE_TRAM)) tram_owner = GetRoadOwner(tile, ROADTYPE_TRAM);
1688  break;
1689  }
1690  }
1691 
1692  /* Now we have to discover, if the tile has only one owner or many:
1693  * - Find a first_owner of the tile. (Currently road or tram must be present, but this will break when the third type becomes available)
1694  * - Compare the found owner with the other owners, and test if they differ.
1695  * Note: If road exists it will be the first_owner.
1696  */
1697  Owner first_owner = (road_owner == INVALID_OWNER ? tram_owner : road_owner);
1698  bool mixed_owners = (tram_owner != INVALID_OWNER && tram_owner != first_owner) || (rail_owner != INVALID_OWNER && rail_owner != first_owner);
1699 
1700  if (mixed_owners) {
1701  /* Multiple owners */
1702  td->owner_type[0] = (rail_owner == INVALID_OWNER ? STR_NULL : STR_LAND_AREA_INFORMATION_RAIL_OWNER);
1703  td->owner[0] = rail_owner;
1704  td->owner_type[1] = (road_owner == INVALID_OWNER ? STR_NULL : STR_LAND_AREA_INFORMATION_ROAD_OWNER);
1705  td->owner[1] = road_owner;
1706  td->owner_type[2] = (tram_owner == INVALID_OWNER ? STR_NULL : STR_LAND_AREA_INFORMATION_TRAM_OWNER);
1707  td->owner[2] = tram_owner;
1708  } else {
1709  /* One to rule them all */
1710  td->owner[0] = first_owner;
1711  }
1712 }
1713 
1718 static const byte _roadveh_enter_depot_dir[4] = {
1720 };
1721 
1722 static VehicleEnterTileStatus VehicleEnter_Road(Vehicle *v, TileIndex tile, int x, int y)
1723 {
1724  switch (GetRoadTileType(tile)) {
1725  case ROAD_TILE_DEPOT: {
1726  if (v->type != VEH_ROAD) break;
1727 
1728  RoadVehicle *rv = RoadVehicle::From(v);
1729  if (rv->frame == RVC_DEPOT_STOP_FRAME &&
1730  _roadveh_enter_depot_dir[GetRoadDepotDirection(tile)] == rv->state) {
1731  rv->state = RVSB_IN_DEPOT;
1732  rv->vehstatus |= VS_HIDDEN;
1733  rv->direction = ReverseDir(rv->direction);
1734  if (rv->Next() == NULL) VehicleEnterDepot(rv->First());
1735  rv->tile = tile;
1736 
1738  return VETSB_ENTERED_WORMHOLE;
1739  }
1740  break;
1741  }
1742 
1743  default: break;
1744  }
1745  return VETSB_CONTINUE;
1746 }
1747 
1748 
1749 static void ChangeTileOwner_Road(TileIndex tile, Owner old_owner, Owner new_owner)
1750 {
1751  if (IsRoadDepot(tile)) {
1752  if (GetTileOwner(tile) == old_owner) {
1753  if (new_owner == INVALID_OWNER) {
1754  DoCommand(tile, 0, 0, DC_EXEC | DC_BANKRUPT, CMD_LANDSCAPE_CLEAR);
1755  } else {
1756  /* A road depot has two road bits. No need to dirty windows here, we'll redraw the whole screen anyway. */
1758  Company::Get(old_owner)->infrastructure.road[rt] -= 2;
1759  Company::Get(new_owner)->infrastructure.road[rt] += 2;
1760 
1761  SetTileOwner(tile, new_owner);
1762  for (RoadType rt = ROADTYPE_ROAD; rt < ROADTYPE_END; rt++) {
1763  if (GetRoadOwner(tile, rt) == old_owner) {
1764  SetRoadOwner(tile, rt, new_owner);
1765  }
1766  }
1767  }
1768  }
1769  return;
1770  }
1771 
1772  for (RoadType rt = ROADTYPE_ROAD; rt < ROADTYPE_END; rt++) {
1773  /* Update all roadtypes, no matter if they are present */
1774  if (GetRoadOwner(tile, rt) == old_owner) {
1775  if (HasTileRoadType(tile, rt)) {
1776  /* A level crossing has two road bits. No need to dirty windows here, we'll redraw the whole screen anyway. */
1777  uint num_bits = IsLevelCrossing(tile) ? 2 : CountBits(GetRoadBits(tile, rt));
1778  Company::Get(old_owner)->infrastructure.road[rt] -= num_bits;
1779  if (new_owner != INVALID_OWNER) Company::Get(new_owner)->infrastructure.road[rt] += num_bits;
1780  }
1781 
1782  SetRoadOwner(tile, rt, new_owner == INVALID_OWNER ? OWNER_NONE : new_owner);
1783  }
1784  }
1785 
1786  if (IsLevelCrossing(tile)) {
1787  if (GetTileOwner(tile) == old_owner) {
1788  if (new_owner == INVALID_OWNER) {
1790  } else {
1791  /* Update infrastructure counts. No need to dirty windows here, we'll redraw the whole screen anyway. */
1792  Company::Get(old_owner)->infrastructure.rail[GetRailType(tile)] -= LEVELCROSSING_TRACKBIT_FACTOR;
1793  Company::Get(new_owner)->infrastructure.rail[GetRailType(tile)] += LEVELCROSSING_TRACKBIT_FACTOR;
1794 
1795  SetTileOwner(tile, new_owner);
1796  }
1797  }
1798  }
1799 }
1800 
1801 static CommandCost TerraformTile_Road(TileIndex tile, DoCommandFlag flags, int z_new, Slope tileh_new)
1802 {
1804  switch (GetRoadTileType(tile)) {
1805  case ROAD_TILE_CROSSING:
1806  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]);
1807  break;
1808 
1809  case ROAD_TILE_DEPOT:
1810  if (AutoslopeCheckForEntranceEdge(tile, z_new, tileh_new, GetRoadDepotDirection(tile))) return CommandCost(EXPENSES_CONSTRUCTION, _price[PR_BUILD_FOUNDATION]);
1811  break;
1812 
1813  case ROAD_TILE_NORMAL: {
1814  RoadBits bits = GetAllRoadBits(tile);
1815  RoadBits bits_copy = bits;
1816  /* Check if the slope-road_bits combination is valid at all, i.e. it is safe to call GetRoadFoundation(). */
1817  if (CheckRoadSlope(tileh_new, &bits_copy, ROAD_NONE, ROAD_NONE).Succeeded()) {
1818  /* CheckRoadSlope() sometimes changes the road_bits, if it does not agree with them. */
1819  if (bits == bits_copy) {
1820  int z_old;
1821  Slope tileh_old = GetTileSlope(tile, &z_old);
1822 
1823  /* Get the slope on top of the foundation */
1824  z_old += ApplyFoundationToSlope(GetRoadFoundation(tileh_old, bits), &tileh_old);
1825  z_new += ApplyFoundationToSlope(GetRoadFoundation(tileh_new, bits), &tileh_new);
1826 
1827  /* The surface slope must not be changed */
1828  if ((z_old == z_new) && (tileh_old == tileh_new)) return CommandCost(EXPENSES_CONSTRUCTION, _price[PR_BUILD_FOUNDATION]);
1829  }
1830  }
1831  break;
1832  }
1833 
1834  default: NOT_REACHED();
1835  }
1836  }
1837 
1838  return DoCommand(tile, 0, 0, flags, CMD_LANDSCAPE_CLEAR);
1839 }
1840 
1842 extern const TileTypeProcs _tile_type_road_procs = {
1843  DrawTile_Road, // draw_tile_proc
1844  GetSlopePixelZ_Road, // get_slope_z_proc
1845  ClearTile_Road, // clear_tile_proc
1846  NULL, // add_accepted_cargo_proc
1847  GetTileDesc_Road, // get_tile_desc_proc
1848  GetTileTrackStatus_Road, // get_tile_track_status_proc
1849  ClickTile_Road, // click_tile_proc
1850  NULL, // animate_tile_proc
1851  TileLoop_Road, // tile_loop_proc
1852  ChangeTileOwner_Road, // change_tile_owner_proc
1853  NULL, // add_produced_cargo_proc
1854  VehicleEnter_Road, // vehicle_enter_tile_proc
1855  GetFoundation_Road, // get_foundation_proc
1856  TerraformTile_Road, // terraform_tile_proc
1857 };