OpenTTD
road_cmd.cpp
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1 /* $Id: road_cmd.cpp 27308 2015-06-20 13:11:09Z 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 * _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  /* Disallow breaking end-of-line of someone else
567  * so trams can still reverse on this tile. */
568  if (rt == ROADTYPE_TRAM && HasExactlyOneBit(existing)) {
569  Owner owner = GetRoadOwner(tile, rt);
570  if (Company::IsValidID(owner)) {
571  CommandCost ret = CheckOwnership(owner);
572  if (ret.Failed()) return ret;
573  }
574  }
575  break;
576  }
577 
578  case ROAD_TILE_CROSSING:
579  other_bits = GetCrossingRoadBits(tile);
580  if (pieces & ComplementRoadBits(other_bits)) goto do_clear;
581  pieces = other_bits; // we need to pay for both roadbits
582 
583  if (HasTileRoadType(tile, rt)) return_cmd_error(STR_ERROR_ALREADY_BUILT);
584  break;
585 
586  case ROAD_TILE_DEPOT:
587  if ((GetAnyRoadBits(tile, rt) & pieces) == pieces) return_cmd_error(STR_ERROR_ALREADY_BUILT);
588  goto do_clear;
589 
590  default: NOT_REACHED();
591  }
592  break;
593 
594  case MP_RAILWAY: {
595  if (IsSteepSlope(tileh)) {
596  return_cmd_error(STR_ERROR_LAND_SLOPED_IN_WRONG_DIRECTION);
597  }
598 
599  /* Level crossings may only be built on these slopes */
600  if (!HasBit(VALID_LEVEL_CROSSING_SLOPES, tileh)) {
601  return_cmd_error(STR_ERROR_LAND_SLOPED_IN_WRONG_DIRECTION);
602  }
603 
604  if (GetRailTileType(tile) != RAIL_TILE_NORMAL) goto do_clear;
605 
606  if (RailNoLevelCrossings(GetRailType(tile))) {
607  return_cmd_error(STR_ERROR_CROSSING_DISALLOWED);
608  }
609 
610  Axis roaddir;
611  switch (GetTrackBits(tile)) {
612  case TRACK_BIT_X:
613  if (pieces & ROAD_X) goto do_clear;
614  roaddir = AXIS_Y;
615  break;
616 
617  case TRACK_BIT_Y:
618  if (pieces & ROAD_Y) goto do_clear;
619  roaddir = AXIS_X;
620  break;
621 
622  default: goto do_clear;
623  }
624 
626  if (ret.Failed()) return ret;
627 
628  if (flags & DC_EXEC) {
629  Track railtrack = AxisToTrack(OtherAxis(roaddir));
630  YapfNotifyTrackLayoutChange(tile, railtrack);
631  /* Update company infrastructure counts. A level crossing has two road bits. */
632  Company *c = Company::GetIfValid(company);
633  if (c != NULL) {
634  c->infrastructure.road[rt] += 2;
635  if (rt != ROADTYPE_ROAD) c->infrastructure.road[ROADTYPE_ROAD] += 2;
637  }
638  /* Update rail count for level crossings. The plain track is already
639  * counted, so only add the difference to the level crossing cost. */
641  if (c != NULL) c->infrastructure.rail[GetRailType(tile)] += LEVELCROSSING_TRACKBIT_FACTOR - 1;
642 
643  /* Always add road to the roadtypes (can't draw without it) */
644  bool reserved = HasBit(GetRailReservationTrackBits(tile), railtrack);
645  MakeRoadCrossing(tile, company, company, GetTileOwner(tile), roaddir, GetRailType(tile), RoadTypeToRoadTypes(rt) | ROADTYPES_ROAD, p2);
646  SetCrossingReservation(tile, reserved);
647  UpdateLevelCrossing(tile, false);
648  MarkTileDirtyByTile(tile);
649  }
650  return CommandCost(EXPENSES_CONSTRUCTION, _price[PR_BUILD_ROAD] * (rt == ROADTYPE_ROAD ? 2 : 4));
651  }
652 
653  case MP_STATION: {
654  if ((GetAnyRoadBits(tile, rt) & pieces) == pieces) return_cmd_error(STR_ERROR_ALREADY_BUILT);
655  if (!IsDriveThroughStopTile(tile)) goto do_clear;
656 
658  if (pieces & ~curbits) goto do_clear;
659  pieces = curbits; // we need to pay for both roadbits
660 
661  if (HasTileRoadType(tile, rt)) return_cmd_error(STR_ERROR_ALREADY_BUILT);
662  break;
663  }
664 
665  case MP_TUNNELBRIDGE: {
666  if (GetTunnelBridgeTransportType(tile) != TRANSPORT_ROAD) goto do_clear;
667  /* Only allow building the outern roadbit, so building long roads stops at existing bridges */
668  if (MirrorRoadBits(DiagDirToRoadBits(GetTunnelBridgeDirection(tile))) != pieces) goto do_clear;
669  if (HasTileRoadType(tile, rt)) return_cmd_error(STR_ERROR_ALREADY_BUILT);
670  /* Don't allow adding roadtype to the bridge/tunnel when vehicles are already driving on it */
672  if (ret.Failed()) return ret;
673  break;
674  }
675 
676  default: {
677 do_clear:;
678  need_to_clear = true;
679  break;
680  }
681  }
682 
683  if (need_to_clear) {
684  CommandCost ret = DoCommand(tile, 0, 0, flags, CMD_LANDSCAPE_CLEAR);
685  if (ret.Failed()) return ret;
686  cost.AddCost(ret);
687  }
688 
689  if (other_bits != pieces) {
690  /* Check the foundation/slopes when adding road/tram bits */
691  CommandCost ret = CheckRoadSlope(tileh, &pieces, existing, other_bits);
692  /* Return an error if we need to build a foundation (ret != 0) but the
693  * current setting is turned off */
694  if (ret.Failed() || (ret.GetCost() != 0 && !_settings_game.construction.build_on_slopes)) {
695  return_cmd_error(STR_ERROR_LAND_SLOPED_IN_WRONG_DIRECTION);
696  }
697  cost.AddCost(ret);
698  }
699 
700  if (!need_to_clear) {
701  if (IsTileType(tile, MP_ROAD)) {
702  /* Don't put the pieces that already exist */
703  pieces &= ComplementRoadBits(existing);
704 
705  /* Check if new road bits will have the same foundation as other existing road types */
706  if (IsNormalRoad(tile)) {
707  Slope slope = GetTileSlope(tile);
708  Foundation found_new = GetRoadFoundation(slope, pieces | existing);
709 
710  /* Test if all other roadtypes can be built at that foundation */
711  for (RoadType rtest = ROADTYPE_ROAD; rtest < ROADTYPE_END; rtest++) {
712  if (rtest != rt) { // check only other road types
713  RoadBits bits = GetRoadBits(tile, rtest);
714  /* do not check if there are not road bits of given type */
715  if (bits != ROAD_NONE && GetRoadFoundation(slope, bits) != found_new) {
716  return_cmd_error(STR_ERROR_LAND_SLOPED_IN_WRONG_DIRECTION);
717  }
718  }
719  }
720  }
721  }
722 
724  if (ret.Failed()) return ret;
725 
726  }
727 
728  uint num_pieces = (!need_to_clear && IsTileType(tile, MP_TUNNELBRIDGE)) ?
729  /* There are 2 pieces on *every* tile of the bridge or tunnel */
730  2 * (GetTunnelBridgeLength(GetOtherTunnelBridgeEnd(tile), tile) + 2) :
731  /* Count pieces */
732  CountBits(pieces);
733 
734  cost.AddCost(num_pieces * _price[PR_BUILD_ROAD]);
735 
736  if (flags & DC_EXEC) {
737  switch (GetTileType(tile)) {
738  case MP_ROAD: {
739  RoadTileType rtt = GetRoadTileType(tile);
740  if (existing == ROAD_NONE || rtt == ROAD_TILE_CROSSING) {
741  SetRoadTypes(tile, GetRoadTypes(tile) | RoadTypeToRoadTypes(rt));
742  SetRoadOwner(tile, rt, company);
743  if (rt == ROADTYPE_ROAD) SetTownIndex(tile, p2);
744  }
745  if (rtt != ROAD_TILE_CROSSING) SetRoadBits(tile, existing | pieces, rt);
746  break;
747  }
748 
749  case MP_TUNNELBRIDGE: {
750  TileIndex other_end = GetOtherTunnelBridgeEnd(tile);
751 
752  SetRoadTypes(other_end, GetRoadTypes(other_end) | RoadTypeToRoadTypes(rt));
753  SetRoadTypes(tile, GetRoadTypes(tile) | RoadTypeToRoadTypes(rt));
754  SetRoadOwner(other_end, rt, company);
755  SetRoadOwner(tile, rt, company);
756 
757  /* Mark tiles dirty that have been repaved */
758  if (IsBridge(tile)) {
759  MarkBridgeDirty(tile);
760  } else {
761  MarkTileDirtyByTile(other_end);
762  MarkTileDirtyByTile(tile);
763  }
764  break;
765  }
766 
767  case MP_STATION:
768  assert(IsDriveThroughStopTile(tile));
769  SetRoadTypes(tile, GetRoadTypes(tile) | RoadTypeToRoadTypes(rt));
770  SetRoadOwner(tile, rt, company);
771  break;
772 
773  default:
774  MakeRoadNormal(tile, pieces, RoadTypeToRoadTypes(rt), p2, company, company);
775  break;
776  }
777 
778  /* Update company infrastructure count. */
779  Company *c = Company::GetIfValid(GetRoadOwner(tile, rt));
780  if (c != NULL) {
781  if (IsTileType(tile, MP_TUNNELBRIDGE)) num_pieces *= TUNNELBRIDGE_TRACKBIT_FACTOR;
782  c->infrastructure.road[rt] += num_pieces;
784  }
785 
786  if (rt != ROADTYPE_TRAM && IsNormalRoadTile(tile)) {
787  existing |= pieces;
789  GetDisallowedRoadDirections(tile) ^ toggle_drd : DRD_NONE);
790  }
791 
792  MarkTileDirtyByTile(tile);
793  }
794  return cost;
795 }
796 
805 {
806  RoadBits bits = GetAnyRoadBits(tile + TileOffsByDiagDir(dir), rt, false);
807  return (bits & DiagDirToRoadBits(ReverseDiagDir(dir))) != 0;
808 }
809 
827 CommandCost CmdBuildLongRoad(TileIndex start_tile, DoCommandFlag flags, uint32 p1, uint32 p2, const char *text)
828 {
830 
831  if (p1 >= MapSize()) return CMD_ERROR;
832 
833  TileIndex end_tile = p1;
834  RoadType rt = Extract<RoadType, 3, 2>(p2);
835  if (!IsValidRoadType(rt) || !ValParamRoadType(rt)) return CMD_ERROR;
836 
837  Axis axis = Extract<Axis, 2, 1>(p2);
838  /* Only drag in X or Y direction dictated by the direction variable */
839  if (axis == AXIS_X && TileY(start_tile) != TileY(end_tile)) return CMD_ERROR; // x-axis
840  if (axis == AXIS_Y && TileX(start_tile) != TileX(end_tile)) return CMD_ERROR; // y-axis
841 
842  DiagDirection dir = AxisToDiagDir(axis);
843 
844  /* Swap direction, also the half-tile drag var (bit 0 and 1) */
845  if (start_tile > end_tile || (start_tile == end_tile && HasBit(p2, 0))) {
846  dir = ReverseDiagDir(dir);
847  p2 ^= 3;
848  drd = DRD_SOUTHBOUND;
849  }
850 
851  /* On the X-axis, we have to swap the initial bits, so they
852  * will be interpreted correctly in the GTTS. Furthermore
853  * when you just 'click' on one tile to build them. */
854  if ((axis == AXIS_Y) == (start_tile == end_tile && HasBit(p2, 0) == HasBit(p2, 1))) drd ^= DRD_BOTH;
855  /* No disallowed direction bits have to be toggled */
856  if (!HasBit(p2, 5)) drd = DRD_NONE;
857 
859  CommandCost last_error = CMD_ERROR;
860  TileIndex tile = start_tile;
861  bool had_bridge = false;
862  bool had_tunnel = false;
863  bool had_success = false;
864  bool is_ai = HasBit(p2, 6);
865 
866  /* Start tile is the first tile clicked by the user. */
867  for (;;) {
868  RoadBits bits = AxisToRoadBits(axis);
869 
870  /* Determine which road parts should be built. */
871  if (!is_ai && start_tile != end_tile) {
872  /* Only build the first and last roadbit if they can connect to something. */
873  if (tile == end_tile && !CanConnectToRoad(tile, rt, dir)) {
874  bits = DiagDirToRoadBits(ReverseDiagDir(dir));
875  } else if (tile == start_tile && !CanConnectToRoad(tile, rt, ReverseDiagDir(dir))) {
876  bits = DiagDirToRoadBits(dir);
877  }
878  } else {
879  /* Road parts only have to be built at the start tile or at the end tile. */
880  if (tile == end_tile && !HasBit(p2, 1)) bits &= DiagDirToRoadBits(ReverseDiagDir(dir));
881  if (tile == start_tile && HasBit(p2, 0)) bits &= DiagDirToRoadBits(dir);
882  }
883 
884  CommandCost ret = DoCommand(tile, drd << 6 | rt << 4 | bits, 0, flags, CMD_BUILD_ROAD);
885  if (ret.Failed()) {
886  last_error = ret;
887  if (last_error.GetErrorMessage() != STR_ERROR_ALREADY_BUILT) {
888  if (is_ai) return last_error;
889  break;
890  }
891  } else {
892  had_success = true;
893  /* Only pay for the upgrade on one side of the bridges and tunnels */
894  if (IsTileType(tile, MP_TUNNELBRIDGE)) {
895  if (IsBridge(tile)) {
896  if (!had_bridge || GetTunnelBridgeDirection(tile) == dir) {
897  cost.AddCost(ret);
898  }
899  had_bridge = true;
900  } else { // IsTunnel(tile)
901  if (!had_tunnel || GetTunnelBridgeDirection(tile) == dir) {
902  cost.AddCost(ret);
903  }
904  had_tunnel = true;
905  }
906  } else {
907  cost.AddCost(ret);
908  }
909  }
910 
911  if (tile == end_tile) break;
912 
913  tile += TileOffsByDiagDir(dir);
914  }
915 
916  return had_success ? cost : last_error;
917 }
918 
932 CommandCost CmdRemoveLongRoad(TileIndex start_tile, DoCommandFlag flags, uint32 p1, uint32 p2, const char *text)
933 {
935 
936  if (p1 >= MapSize()) return CMD_ERROR;
937 
938  TileIndex end_tile = p1;
939  RoadType rt = Extract<RoadType, 3, 2>(p2);
940  if (!IsValidRoadType(rt)) return CMD_ERROR;
941 
942  Axis axis = Extract<Axis, 2, 1>(p2);
943  /* Only drag in X or Y direction dictated by the direction variable */
944  if (axis == AXIS_X && TileY(start_tile) != TileY(end_tile)) return CMD_ERROR; // x-axis
945  if (axis == AXIS_Y && TileX(start_tile) != TileX(end_tile)) return CMD_ERROR; // y-axis
946 
947  /* Swap start and ending tile, also the half-tile drag var (bit 0 and 1) */
948  if (start_tile > end_tile || (start_tile == end_tile && HasBit(p2, 0))) {
949  TileIndex t = start_tile;
950  start_tile = end_tile;
951  end_tile = t;
952  p2 ^= IsInsideMM(p2 & 3, 1, 3) ? 3 : 0;
953  }
954 
956  TileIndex tile = start_tile;
957  CommandCost last_error = CMD_ERROR;
958  bool had_success = false;
959  /* Start tile is the small number. */
960  for (;;) {
961  RoadBits bits = AxisToRoadBits(axis);
962 
963  if (tile == end_tile && !HasBit(p2, 1)) bits &= ROAD_NW | ROAD_NE;
964  if (tile == start_tile && HasBit(p2, 0)) bits &= ROAD_SE | ROAD_SW;
965 
966  /* try to remove the halves. */
967  if (bits != 0) {
968  CommandCost ret = RemoveRoad(tile, flags & ~DC_EXEC, bits, rt, true);
969  if (ret.Succeeded()) {
970  if (flags & DC_EXEC) {
971  money -= ret.GetCost();
972  if (money < 0) {
973  _additional_cash_required = DoCommand(start_tile, end_tile, p2, flags & ~DC_EXEC, CMD_REMOVE_LONG_ROAD).GetCost();
974  return cost;
975  }
976  RemoveRoad(tile, flags, bits, rt, true, false);
977  }
978  cost.AddCost(ret);
979  had_success = true;
980  } else {
981  /* Ownership errors are more important. */
982  if (last_error.GetErrorMessage() != STR_ERROR_OWNED_BY) last_error = ret;
983  }
984  }
985 
986  if (tile == end_tile) break;
987 
988  tile += (axis == AXIS_Y) ? TileDiffXY(0, 1) : TileDiffXY(1, 0);
989  }
990 
991  return had_success ? cost : last_error;
992 }
993 
1007 CommandCost CmdBuildRoadDepot(TileIndex tile, DoCommandFlag flags, uint32 p1, uint32 p2, const char *text)
1008 {
1009  DiagDirection dir = Extract<DiagDirection, 0, 2>(p1);
1010  RoadType rt = Extract<RoadType, 2, 2>(p1);
1011 
1012  if (!IsValidRoadType(rt) || !ValParamRoadType(rt)) return CMD_ERROR;
1013 
1014  Slope tileh = GetTileSlope(tile);
1015  if (tileh != SLOPE_FLAT && (
1017  !CanBuildDepotByTileh(dir, tileh)
1018  )) {
1019  return_cmd_error(STR_ERROR_FLAT_LAND_REQUIRED);
1020  }
1021 
1022  CommandCost cost = DoCommand(tile, 0, 0, flags, CMD_LANDSCAPE_CLEAR);
1023  if (cost.Failed()) return cost;
1024 
1025  if (IsBridgeAbove(tile)) return_cmd_error(STR_ERROR_MUST_DEMOLISH_BRIDGE_FIRST);
1026 
1027  if (!Depot::CanAllocateItem()) return CMD_ERROR;
1028 
1029  if (flags & DC_EXEC) {
1030  Depot *dep = new Depot(tile);
1031  dep->build_date = _date;
1032 
1033  /* A road depot has two road bits. */
1034  Company::Get(_current_company)->infrastructure.road[rt] += 2;
1036 
1037  MakeRoadDepot(tile, _current_company, dep->index, dir, rt);
1038  MarkTileDirtyByTile(tile);
1039  MakeDefaultName(dep);
1040  }
1041  cost.AddCost(_price[PR_BUILD_DEPOT_ROAD]);
1042  return cost;
1043 }
1044 
1045 static CommandCost RemoveRoadDepot(TileIndex tile, DoCommandFlag flags)
1046 {
1047  if (_current_company != OWNER_WATER) {
1048  CommandCost ret = CheckTileOwnership(tile);
1049  if (ret.Failed()) return ret;
1050  }
1051 
1053  if (ret.Failed()) return ret;
1054 
1055  if (flags & DC_EXEC) {
1057  if (c != NULL) {
1058  /* A road depot has two road bits. */
1061  }
1062 
1063  delete Depot::GetByTile(tile);
1064  DoClearSquare(tile);
1065  }
1066 
1067  return CommandCost(EXPENSES_CONSTRUCTION, _price[PR_CLEAR_DEPOT_ROAD]);
1068 }
1069 
1070 static CommandCost ClearTile_Road(TileIndex tile, DoCommandFlag flags)
1071 {
1072  switch (GetRoadTileType(tile)) {
1073  case ROAD_TILE_NORMAL: {
1074  RoadBits b = GetAllRoadBits(tile);
1075 
1076  /* Clear the road if only one piece is on the tile OR we are not using the DC_AUTO flag */
1077  if ((HasExactlyOneBit(b) && GetRoadBits(tile, ROADTYPE_TRAM) == ROAD_NONE) || !(flags & DC_AUTO)) {
1079  RoadType rt;
1080  FOR_EACH_SET_ROADTYPE(rt, GetRoadTypes(tile)) {
1081  CommandCost tmp_ret = RemoveRoad(tile, flags, GetRoadBits(tile, rt), rt, true);
1082  if (tmp_ret.Failed()) return tmp_ret;
1083  ret.AddCost(tmp_ret);
1084  }
1085  return ret;
1086  }
1087  return_cmd_error(STR_ERROR_MUST_REMOVE_ROAD_FIRST);
1088  }
1089 
1090  case ROAD_TILE_CROSSING: {
1091  RoadTypes rts = GetRoadTypes(tile);
1093 
1094  if (flags & DC_AUTO) return_cmd_error(STR_ERROR_MUST_REMOVE_ROAD_FIRST);
1095 
1096  /* Must iterate over the roadtypes in a reverse manner because
1097  * tram tracks must be removed before the road bits. */
1098  RoadType rt = ROADTYPE_TRAM;
1099  do {
1100  if (HasBit(rts, rt)) {
1101  CommandCost tmp_ret = RemoveRoad(tile, flags, GetCrossingRoadBits(tile), rt, false);
1102  if (tmp_ret.Failed()) return tmp_ret;
1103  ret.AddCost(tmp_ret);
1104  }
1105  } while (rt-- != ROADTYPE_ROAD);
1106 
1107  if (flags & DC_EXEC) {
1108  DoCommand(tile, 0, 0, flags, CMD_LANDSCAPE_CLEAR);
1109  }
1110  return ret;
1111  }
1112 
1113  default:
1114  case ROAD_TILE_DEPOT:
1115  if (flags & DC_AUTO) {
1116  return_cmd_error(STR_ERROR_BUILDING_MUST_BE_DEMOLISHED);
1117  }
1118  return RemoveRoadDepot(tile, flags);
1119  }
1120 }
1121 
1122 
1124  uint16 image;
1125  byte subcoord_x;
1126  byte subcoord_y;
1127 };
1128 
1129 #include "table/road_land.h"
1130 
1139 {
1140  /* Flat land and land without a road doesn't require a foundation */
1141  if (tileh == SLOPE_FLAT || bits == ROAD_NONE) return FOUNDATION_NONE;
1142 
1143  /* Steep slopes behave the same as slopes with one corner raised. */
1144  if (IsSteepSlope(tileh)) {
1146  }
1147 
1148  /* Leveled RoadBits on a slope */
1149  if ((_invalid_tileh_slopes_road[0][tileh] & bits) == ROAD_NONE) return FOUNDATION_LEVELED;
1150 
1151  /* Straight roads without foundation on a slope */
1152  if (!IsSlopeWithOneCornerRaised(tileh) &&
1153  (_invalid_tileh_slopes_road[1][tileh] & bits) == ROAD_NONE)
1154  return FOUNDATION_NONE;
1155 
1156  /* Roads on steep Slopes or on Slopes with one corner raised */
1157  return (bits == ROAD_X ? FOUNDATION_INCLINED_X : FOUNDATION_INCLINED_Y);
1158 }
1159 
1160 const byte _road_sloped_sprites[14] = {
1161  0, 0, 2, 0,
1162  0, 1, 0, 0,
1163  3, 0, 0, 0,
1164  0, 0
1165 };
1166 
1176 static bool DrawRoadAsSnowDesert(TileIndex tile, Roadside roadside)
1177 {
1178  return (IsOnSnow(tile) &&
1179  !(_settings_game.game_creation.landscape == LT_TROPIC && HasGrfMiscBit(GMB_DESERT_PAVED_ROADS) &&
1180  roadside != ROADSIDE_BARREN && roadside != ROADSIDE_GRASS && roadside != ROADSIDE_GRASS_ROAD_WORKS));
1181 }
1182 
1188 void DrawTramCatenary(const TileInfo *ti, RoadBits tram)
1189 {
1190  /* Do not draw catenary if it is invisible */
1191  if (IsInvisibilitySet(TO_CATENARY)) return;
1192 
1193  /* Don't draw the catenary under a low bridge */
1195  int height = GetBridgeHeight(GetNorthernBridgeEnd(ti->tile));
1196 
1197  if (height <= GetTileMaxZ(ti->tile) + 1) return;
1198  }
1199 
1200  SpriteID front;
1201  SpriteID back;
1202 
1203  if (ti->tileh != SLOPE_FLAT) {
1204  back = SPR_TRAMWAY_BACK_WIRES_SLOPED + _road_sloped_sprites[ti->tileh - 1];
1205  front = SPR_TRAMWAY_FRONT_WIRES_SLOPED + _road_sloped_sprites[ti->tileh - 1];
1206  } else {
1207  back = SPR_TRAMWAY_BASE + _road_backpole_sprites_1[tram];
1208  front = SPR_TRAMWAY_BASE + _road_frontwire_sprites_1[tram];
1209  }
1210 
1211  AddSortableSpriteToDraw(back, PAL_NONE, ti->x, ti->y, 16, 16, TILE_HEIGHT + BB_HEIGHT_UNDER_BRIDGE, ti->z, IsTransparencySet(TO_CATENARY));
1212  AddSortableSpriteToDraw(front, PAL_NONE, ti->x, ti->y, 16, 16, TILE_HEIGHT + BB_HEIGHT_UNDER_BRIDGE, ti->z, IsTransparencySet(TO_CATENARY));
1213 }
1214 
1223 static void DrawRoadDetail(SpriteID img, const TileInfo *ti, int dx, int dy, int h)
1224 {
1225  int x = ti->x | dx;
1226  int y = ti->y | dy;
1227  int z = ti->z;
1228  if (ti->tileh != SLOPE_FLAT) z = GetSlopePixelZ(x, y);
1229  AddSortableSpriteToDraw(img, PAL_NONE, x, y, 2, 2, h, z);
1230 }
1231 
1236 static void DrawRoadBits(TileInfo *ti)
1237 {
1238  RoadBits road = GetRoadBits(ti->tile, ROADTYPE_ROAD);
1239  RoadBits tram = GetRoadBits(ti->tile, ROADTYPE_TRAM);
1240 
1241  SpriteID image = 0;
1242  PaletteID pal = PAL_NONE;
1243 
1244  if (ti->tileh != SLOPE_FLAT) {
1245  DrawFoundation(ti, GetRoadFoundation(ti->tileh, road | tram));
1246 
1247  /* DrawFoundation() modifies ti.
1248  * Default sloped sprites.. */
1249  if (ti->tileh != SLOPE_FLAT) image = _road_sloped_sprites[ti->tileh - 1] + SPR_ROAD_SLOPE_START;
1250  }
1251 
1252  if (image == 0) image = _road_tile_sprites_1[road != ROAD_NONE ? road : tram];
1253 
1254  Roadside roadside = GetRoadside(ti->tile);
1255 
1256  if (DrawRoadAsSnowDesert(ti->tile, roadside)) {
1257  image += 19;
1258  } else {
1259  switch (roadside) {
1260  case ROADSIDE_BARREN: pal = PALETTE_TO_BARE_LAND; break;
1261  case ROADSIDE_GRASS: break;
1262  case ROADSIDE_GRASS_ROAD_WORKS: break;
1263  default: image -= 19; break; // Paved
1264  }
1265  }
1266 
1267  DrawGroundSprite(image, pal);
1268 
1269  /* For tram we overlay the road graphics with either tram tracks only
1270  * (when there is actual road beneath the trams) or with tram tracks
1271  * and some dirts which hides the road graphics */
1272  if (tram != ROAD_NONE) {
1273  if (ti->tileh != SLOPE_FLAT) {
1274  image = _road_sloped_sprites[ti->tileh - 1] + SPR_TRAMWAY_SLOPED_OFFSET;
1275  } else {
1276  image = _road_tile_sprites_1[tram] - SPR_ROAD_Y;
1277  }
1278  image += (road == ROAD_NONE) ? SPR_TRAMWAY_TRAM : SPR_TRAMWAY_OVERLAY;
1279  DrawGroundSprite(image, pal);
1280  }
1281 
1282  if (road != ROAD_NONE) {
1284  if (drd != DRD_NONE) {
1285  DrawGroundSpriteAt(SPR_ONEWAY_BASE + drd - 1 + ((road == ROAD_X) ? 0 : 3), PAL_NONE, 8, 8, GetPartialPixelZ(8, 8, ti->tileh));
1286  }
1287  }
1288 
1289  if (HasRoadWorks(ti->tile)) {
1290  /* Road works */
1291  DrawGroundSprite((road | tram) & ROAD_X ? SPR_EXCAVATION_X : SPR_EXCAVATION_Y, PAL_NONE);
1292  return;
1293  }
1294 
1295  if (tram != ROAD_NONE) DrawTramCatenary(ti, tram);
1296 
1297  /* Return if full detail is disabled, or we are zoomed fully out. */
1298  if (!HasBit(_display_opt, DO_FULL_DETAIL) || _cur_dpi->zoom > ZOOM_LVL_DETAIL) return;
1299 
1300  /* Do not draw details (street lights, trees) under low bridge */
1301  if (IsBridgeAbove(ti->tile) && (roadside == ROADSIDE_TREES || roadside == ROADSIDE_STREET_LIGHTS)) {
1302  int height = GetBridgeHeight(GetNorthernBridgeEnd(ti->tile));
1303  int minz = GetTileMaxZ(ti->tile) + 2;
1304 
1305  if (roadside == ROADSIDE_TREES) minz++;
1306 
1307  if (height < minz) return;
1308  }
1309 
1310  /* If there are no road bits, return, as there is nothing left to do */
1311  if (HasAtMostOneBit(road)) return;
1312 
1313  /* Draw extra details. */
1314  for (const DrawRoadTileStruct *drts = _road_display_table[roadside][road | tram]; drts->image != 0; drts++) {
1315  DrawRoadDetail(drts->image, ti, drts->subcoord_x, drts->subcoord_y, 0x10);
1316  }
1317 }
1318 
1320 static void DrawTile_Road(TileInfo *ti)
1321 {
1322  switch (GetRoadTileType(ti->tile)) {
1323  case ROAD_TILE_NORMAL:
1324  DrawRoadBits(ti);
1325  break;
1326 
1327  case ROAD_TILE_CROSSING: {
1329 
1330  PaletteID pal = PAL_NONE;
1331  const RailtypeInfo *rti = GetRailTypeInfo(GetRailType(ti->tile));
1332 
1333  if (rti->UsesOverlay()) {
1334  Axis axis = GetCrossingRailAxis(ti->tile);
1335  SpriteID road = SPR_ROAD_Y + axis;
1336 
1337  Roadside roadside = GetRoadside(ti->tile);
1338 
1339  if (DrawRoadAsSnowDesert(ti->tile, roadside)) {
1340  road += 19;
1341  } else {
1342  switch (roadside) {
1343  case ROADSIDE_BARREN: pal = PALETTE_TO_BARE_LAND; break;
1344  case ROADSIDE_GRASS: break;
1345  default: road -= 19; break; // Paved
1346  }
1347  }
1348 
1349  DrawGroundSprite(road, pal);
1350 
1351  SpriteID rail = GetCustomRailSprite(rti, ti->tile, RTSG_CROSSING) + axis;
1352  /* Draw tracks, but draw PBS reserved tracks darker. */
1353  pal = (_game_mode != GM_MENU && _settings_client.gui.show_track_reservation && HasCrossingReservation(ti->tile)) ? PALETTE_CRASH : PAL_NONE;
1354  DrawGroundSprite(rail, pal);
1355 
1356  DrawRailTileSeq(ti, &_crossing_layout, TO_CATENARY, rail, 0, PAL_NONE);
1357  } else {
1358  SpriteID image = rti->base_sprites.crossing;
1359 
1360  if (GetCrossingRoadAxis(ti->tile) == AXIS_X) image++;
1361  if (IsCrossingBarred(ti->tile)) image += 2;
1362 
1363  Roadside roadside = GetRoadside(ti->tile);
1364 
1365  if (DrawRoadAsSnowDesert(ti->tile, roadside)) {
1366  image += 8;
1367  } else {
1368  switch (roadside) {
1369  case ROADSIDE_BARREN: pal = PALETTE_TO_BARE_LAND; break;
1370  case ROADSIDE_GRASS: break;
1371  default: image += 4; break; // Paved
1372  }
1373  }
1374 
1375  DrawGroundSprite(image, pal);
1376 
1377  /* PBS debugging, draw reserved tracks darker */
1378  if (_game_mode != GM_MENU && _settings_client.gui.show_track_reservation && HasCrossingReservation(ti->tile)) {
1380  }
1381  }
1382 
1383  if (HasTileRoadType(ti->tile, ROADTYPE_TRAM)) {
1384  DrawGroundSprite(SPR_TRAMWAY_OVERLAY + (GetCrossingRoadAxis(ti->tile) ^ 1), pal);
1386  }
1388  break;
1389  }
1390 
1391  default:
1392  case ROAD_TILE_DEPOT: {
1394 
1395  PaletteID palette = COMPANY_SPRITE_COLOUR(GetTileOwner(ti->tile));
1396 
1397  const DrawTileSprites *dts;
1398  if (HasTileRoadType(ti->tile, ROADTYPE_TRAM)) {
1399  dts = &_tram_depot[GetRoadDepotDirection(ti->tile)];
1400  } else {
1401  dts = &_road_depot[GetRoadDepotDirection(ti->tile)];
1402  }
1403 
1404  DrawGroundSprite(dts->ground.sprite, PAL_NONE);
1405  DrawOrigTileSeq(ti, dts, TO_BUILDINGS, palette);
1406  break;
1407  }
1408  }
1409  DrawBridgeMiddle(ti);
1410 }
1411 
1419 void DrawRoadDepotSprite(int x, int y, DiagDirection dir, RoadType rt)
1420 {
1421  PaletteID palette = COMPANY_SPRITE_COLOUR(_local_company);
1422  const DrawTileSprites *dts = (rt == ROADTYPE_TRAM) ? &_tram_depot[dir] : &_road_depot[dir];
1423 
1424  DrawSprite(dts->ground.sprite, PAL_NONE, x, y);
1425  DrawOrigTileSeqInGUI(x, y, dts, palette);
1426 }
1427 
1433 void UpdateNearestTownForRoadTiles(bool invalidate)
1434 {
1435  assert(!invalidate || _generating_world);
1436 
1437  for (TileIndex t = 0; t < MapSize(); t++) {
1438  if (IsTileType(t, MP_ROAD) && !IsRoadDepot(t) && !HasTownOwnedRoad(t)) {
1439  TownID tid = (TownID)INVALID_TOWN;
1440  if (!invalidate) {
1441  const Town *town = CalcClosestTownFromTile(t);
1442  if (town != NULL) tid = town->index;
1443  }
1444  SetTownIndex(t, tid);
1445  }
1446  }
1447 }
1448 
1449 static int GetSlopePixelZ_Road(TileIndex tile, uint x, uint y)
1450 {
1451 
1452  if (IsNormalRoad(tile)) {
1453  int z;
1454  Slope tileh = GetTilePixelSlope(tile, &z);
1455  if (tileh == SLOPE_FLAT) return z;
1456 
1457  Foundation f = GetRoadFoundation(tileh, GetAllRoadBits(tile));
1458  z += ApplyPixelFoundationToSlope(f, &tileh);
1459  return z + GetPartialPixelZ(x & 0xF, y & 0xF, tileh);
1460  } else {
1461  return GetTileMaxPixelZ(tile);
1462  }
1463 }
1464 
1465 static Foundation GetFoundation_Road(TileIndex tile, Slope tileh)
1466 {
1467  if (IsNormalRoad(tile)) {
1468  return GetRoadFoundation(tileh, GetAllRoadBits(tile));
1469  } else {
1470  return FlatteningFoundation(tileh);
1471  }
1472 }
1473 
1474 static const Roadside _town_road_types[][2] = {
1480 };
1481 
1482 static const Roadside _town_road_types_2[][2] = {
1488 };
1489 
1490 
1491 static void TileLoop_Road(TileIndex tile)
1492 {
1494  case LT_ARCTIC:
1495  if (IsOnSnow(tile) != (GetTileZ(tile) > GetSnowLine())) {
1496  ToggleSnow(tile);
1497  MarkTileDirtyByTile(tile);
1498  }
1499  break;
1500 
1501  case LT_TROPIC:
1502  if (GetTropicZone(tile) == TROPICZONE_DESERT && !IsOnDesert(tile)) {
1503  ToggleDesert(tile);
1504  MarkTileDirtyByTile(tile);
1505  }
1506  break;
1507  }
1508 
1509  if (IsRoadDepot(tile)) return;
1510 
1511  const Town *t = ClosestTownFromTile(tile, UINT_MAX);
1512  if (!HasRoadWorks(tile)) {
1513  HouseZonesBits grp = HZB_TOWN_EDGE;
1514 
1515  if (t != NULL) {
1516  grp = GetTownRadiusGroup(t, tile);
1517 
1518  /* Show an animation to indicate road work */
1519  if (t->road_build_months != 0 &&
1520  (DistanceManhattan(t->xy, tile) < 8 || grp != HZB_TOWN_EDGE) &&
1521  IsNormalRoad(tile) && !HasAtMostOneBit(GetAllRoadBits(tile))) {
1522  if (GetFoundationSlope(tile) == SLOPE_FLAT && EnsureNoVehicleOnGround(tile).Succeeded() && Chance16(1, 40)) {
1523  StartRoadWorks(tile);
1524 
1525  if (_settings_client.sound.ambient) SndPlayTileFx(SND_21_JACKHAMMER, tile);
1527  TileX(tile) * TILE_SIZE + 7,
1528  TileY(tile) * TILE_SIZE + 7,
1529  0,
1530  EV_BULLDOZER);
1531  MarkTileDirtyByTile(tile);
1532  return;
1533  }
1534  }
1535  }
1536 
1537  {
1538  /* Adjust road ground type depending on 'grp' (grp is the distance to the center) */
1539  const Roadside *new_rs = (_settings_game.game_creation.landscape == LT_TOYLAND) ? _town_road_types_2[grp] : _town_road_types[grp];
1540  Roadside cur_rs = GetRoadside(tile);
1541 
1542  /* We have our desired type, do nothing */
1543  if (cur_rs == new_rs[0]) return;
1544 
1545  /* We have the pre-type of the desired type, switch to the desired type */
1546  if (cur_rs == new_rs[1]) {
1547  cur_rs = new_rs[0];
1548  /* We have barren land, install the pre-type */
1549  } else if (cur_rs == ROADSIDE_BARREN) {
1550  cur_rs = new_rs[1];
1551  /* We're totally off limits, remove any installation and make barren land */
1552  } else {
1553  cur_rs = ROADSIDE_BARREN;
1554  }
1555  SetRoadside(tile, cur_rs);
1556  MarkTileDirtyByTile(tile);
1557  }
1558  } else if (IncreaseRoadWorksCounter(tile)) {
1559  TerminateRoadWorks(tile);
1560 
1562  /* Generate a nicer town surface */
1563  const RoadBits old_rb = GetAnyRoadBits(tile, ROADTYPE_ROAD);
1564  const RoadBits new_rb = CleanUpRoadBits(tile, old_rb);
1565 
1566  if (old_rb != new_rb) {
1567  RemoveRoad(tile, DC_EXEC | DC_AUTO | DC_NO_WATER, (old_rb ^ new_rb), ROADTYPE_ROAD, true);
1568  }
1569  }
1570 
1571  MarkTileDirtyByTile(tile);
1572  }
1573 }
1574 
1575 static bool ClickTile_Road(TileIndex tile)
1576 {
1577  if (!IsRoadDepot(tile)) return false;
1578 
1579  ShowDepotWindow(tile, VEH_ROAD);
1580  return true;
1581 }
1582 
1583 /* Converts RoadBits to TrackBits */
1584 static const TrackBits _road_trackbits[16] = {
1585  TRACK_BIT_NONE, // ROAD_NONE
1586  TRACK_BIT_NONE, // ROAD_NW
1587  TRACK_BIT_NONE, // ROAD_SW
1588  TRACK_BIT_LEFT, // ROAD_W
1589  TRACK_BIT_NONE, // ROAD_SE
1590  TRACK_BIT_Y, // ROAD_Y
1591  TRACK_BIT_LOWER, // ROAD_S
1592  TRACK_BIT_LEFT | TRACK_BIT_LOWER | TRACK_BIT_Y, // ROAD_Y | ROAD_SW
1593  TRACK_BIT_NONE, // ROAD_NE
1594  TRACK_BIT_UPPER, // ROAD_N
1595  TRACK_BIT_X, // ROAD_X
1596  TRACK_BIT_LEFT | TRACK_BIT_UPPER | TRACK_BIT_X, // ROAD_X | ROAD_NW
1597  TRACK_BIT_RIGHT, // ROAD_E
1598  TRACK_BIT_RIGHT | TRACK_BIT_UPPER | TRACK_BIT_Y, // ROAD_Y | ROAD_NE
1599  TRACK_BIT_RIGHT | TRACK_BIT_LOWER | TRACK_BIT_X, // ROAD_X | ROAD_SE
1600  TRACK_BIT_ALL, // ROAD_ALL
1601 };
1602 
1603 static TrackStatus GetTileTrackStatus_Road(TileIndex tile, TransportType mode, uint sub_mode, DiagDirection side)
1604 {
1605  TrackdirBits trackdirbits = TRACKDIR_BIT_NONE;
1606  TrackdirBits red_signals = TRACKDIR_BIT_NONE; // crossing barred
1607  switch (mode) {
1608  case TRANSPORT_RAIL:
1609  if (IsLevelCrossing(tile)) trackdirbits = TrackBitsToTrackdirBits(GetCrossingRailBits(tile));
1610  break;
1611 
1612  case TRANSPORT_ROAD:
1613  if ((GetRoadTypes(tile) & sub_mode) == 0) break;
1614  switch (GetRoadTileType(tile)) {
1615  case ROAD_TILE_NORMAL: {
1616  const uint drd_to_multiplier[DRD_END] = { 0x101, 0x100, 0x1, 0x0 };
1617  RoadType rt = (RoadType)FindFirstBit(sub_mode);
1618  RoadBits bits = GetRoadBits(tile, rt);
1619 
1620  /* no roadbit at this side of tile, return 0 */
1621  if (side != INVALID_DIAGDIR && (DiagDirToRoadBits(side) & bits) == 0) break;
1622 
1623  uint multiplier = drd_to_multiplier[rt == ROADTYPE_TRAM ? DRD_NONE : GetDisallowedRoadDirections(tile)];
1624  if (!HasRoadWorks(tile)) trackdirbits = (TrackdirBits)(_road_trackbits[bits] * multiplier);
1625  break;
1626  }
1627 
1628  case ROAD_TILE_CROSSING: {
1629  Axis axis = GetCrossingRoadAxis(tile);
1630 
1631  if (side != INVALID_DIAGDIR && axis != DiagDirToAxis(side)) break;
1632 
1633  trackdirbits = TrackBitsToTrackdirBits(AxisToTrackBits(axis));
1634  if (IsCrossingBarred(tile)) red_signals = trackdirbits;
1635  break;
1636  }
1637 
1638  default:
1639  case ROAD_TILE_DEPOT: {
1641 
1642  if (side != INVALID_DIAGDIR && side != dir) break;
1643 
1644  trackdirbits = TrackBitsToTrackdirBits(DiagDirToDiagTrackBits(dir));
1645  break;
1646  }
1647  }
1648  break;
1649 
1650  default: break;
1651  }
1652  return CombineTrackStatus(trackdirbits, red_signals);
1653 }
1654 
1655 static const StringID _road_tile_strings[] = {
1656  STR_LAI_ROAD_DESCRIPTION_ROAD,
1657  STR_LAI_ROAD_DESCRIPTION_ROAD,
1658  STR_LAI_ROAD_DESCRIPTION_ROAD,
1659  STR_LAI_ROAD_DESCRIPTION_ROAD_WITH_STREETLIGHTS,
1660  STR_LAI_ROAD_DESCRIPTION_ROAD,
1661  STR_LAI_ROAD_DESCRIPTION_TREE_LINED_ROAD,
1662  STR_LAI_ROAD_DESCRIPTION_ROAD,
1663  STR_LAI_ROAD_DESCRIPTION_ROAD,
1664 };
1665 
1666 static void GetTileDesc_Road(TileIndex tile, TileDesc *td)
1667 {
1668  Owner rail_owner = INVALID_OWNER;
1669  Owner road_owner = INVALID_OWNER;
1670  Owner tram_owner = INVALID_OWNER;
1671 
1672  switch (GetRoadTileType(tile)) {
1673  case ROAD_TILE_CROSSING: {
1674  td->str = STR_LAI_ROAD_DESCRIPTION_ROAD_RAIL_LEVEL_CROSSING;
1675  RoadTypes rts = GetRoadTypes(tile);
1676  rail_owner = GetTileOwner(tile);
1677  if (HasBit(rts, ROADTYPE_ROAD)) road_owner = GetRoadOwner(tile, ROADTYPE_ROAD);
1678  if (HasBit(rts, ROADTYPE_TRAM)) tram_owner = GetRoadOwner(tile, ROADTYPE_TRAM);
1679 
1680  const RailtypeInfo *rti = GetRailTypeInfo(GetRailType(tile));
1681  td->rail_speed = rti->max_speed;
1682 
1683  break;
1684  }
1685 
1686  case ROAD_TILE_DEPOT:
1687  td->str = STR_LAI_ROAD_DESCRIPTION_ROAD_VEHICLE_DEPOT;
1688  road_owner = GetTileOwner(tile); // Tile has only one owner, roadtype does not matter
1689  td->build_date = Depot::GetByTile(tile)->build_date;
1690  break;
1691 
1692  default: {
1693  RoadTypes rts = GetRoadTypes(tile);
1694  td->str = (HasBit(rts, ROADTYPE_ROAD) ? _road_tile_strings[GetRoadside(tile)] : STR_LAI_ROAD_DESCRIPTION_TRAMWAY);
1695  if (HasBit(rts, ROADTYPE_ROAD)) road_owner = GetRoadOwner(tile, ROADTYPE_ROAD);
1696  if (HasBit(rts, ROADTYPE_TRAM)) tram_owner = GetRoadOwner(tile, ROADTYPE_TRAM);
1697  break;
1698  }
1699  }
1700 
1701  /* Now we have to discover, if the tile has only one owner or many:
1702  * - Find a first_owner of the tile. (Currently road or tram must be present, but this will break when the third type becomes available)
1703  * - Compare the found owner with the other owners, and test if they differ.
1704  * Note: If road exists it will be the first_owner.
1705  */
1706  Owner first_owner = (road_owner == INVALID_OWNER ? tram_owner : road_owner);
1707  bool mixed_owners = (tram_owner != INVALID_OWNER && tram_owner != first_owner) || (rail_owner != INVALID_OWNER && rail_owner != first_owner);
1708 
1709  if (mixed_owners) {
1710  /* Multiple owners */
1711  td->owner_type[0] = (rail_owner == INVALID_OWNER ? STR_NULL : STR_LAND_AREA_INFORMATION_RAIL_OWNER);
1712  td->owner[0] = rail_owner;
1713  td->owner_type[1] = (road_owner == INVALID_OWNER ? STR_NULL : STR_LAND_AREA_INFORMATION_ROAD_OWNER);
1714  td->owner[1] = road_owner;
1715  td->owner_type[2] = (tram_owner == INVALID_OWNER ? STR_NULL : STR_LAND_AREA_INFORMATION_TRAM_OWNER);
1716  td->owner[2] = tram_owner;
1717  } else {
1718  /* One to rule them all */
1719  td->owner[0] = first_owner;
1720  }
1721 }
1722 
1727 static const byte _roadveh_enter_depot_dir[4] = {
1729 };
1730 
1731 static VehicleEnterTileStatus VehicleEnter_Road(Vehicle *v, TileIndex tile, int x, int y)
1732 {
1733  switch (GetRoadTileType(tile)) {
1734  case ROAD_TILE_DEPOT: {
1735  if (v->type != VEH_ROAD) break;
1736 
1737  RoadVehicle *rv = RoadVehicle::From(v);
1738  if (rv->frame == RVC_DEPOT_STOP_FRAME &&
1739  _roadveh_enter_depot_dir[GetRoadDepotDirection(tile)] == rv->state) {
1740  rv->state = RVSB_IN_DEPOT;
1741  rv->vehstatus |= VS_HIDDEN;
1742  rv->direction = ReverseDir(rv->direction);
1743  if (rv->Next() == NULL) VehicleEnterDepot(rv->First());
1744  rv->tile = tile;
1745 
1747  return VETSB_ENTERED_WORMHOLE;
1748  }
1749  break;
1750  }
1751 
1752  default: break;
1753  }
1754  return VETSB_CONTINUE;
1755 }
1756 
1757 
1758 static void ChangeTileOwner_Road(TileIndex tile, Owner old_owner, Owner new_owner)
1759 {
1760  if (IsRoadDepot(tile)) {
1761  if (GetTileOwner(tile) == old_owner) {
1762  if (new_owner == INVALID_OWNER) {
1763  DoCommand(tile, 0, 0, DC_EXEC | DC_BANKRUPT, CMD_LANDSCAPE_CLEAR);
1764  } else {
1765  /* A road depot has two road bits. No need to dirty windows here, we'll redraw the whole screen anyway. */
1767  Company::Get(old_owner)->infrastructure.road[rt] -= 2;
1768  Company::Get(new_owner)->infrastructure.road[rt] += 2;
1769 
1770  SetTileOwner(tile, new_owner);
1771  for (RoadType rt = ROADTYPE_ROAD; rt < ROADTYPE_END; rt++) {
1772  if (GetRoadOwner(tile, rt) == old_owner) {
1773  SetRoadOwner(tile, rt, new_owner);
1774  }
1775  }
1776  }
1777  }
1778  return;
1779  }
1780 
1781  for (RoadType rt = ROADTYPE_ROAD; rt < ROADTYPE_END; rt++) {
1782  /* Update all roadtypes, no matter if they are present */
1783  if (GetRoadOwner(tile, rt) == old_owner) {
1784  if (HasTileRoadType(tile, rt)) {
1785  /* A level crossing has two road bits. No need to dirty windows here, we'll redraw the whole screen anyway. */
1786  uint num_bits = IsLevelCrossing(tile) ? 2 : CountBits(GetRoadBits(tile, rt));
1787  Company::Get(old_owner)->infrastructure.road[rt] -= num_bits;
1788  if (new_owner != INVALID_OWNER) Company::Get(new_owner)->infrastructure.road[rt] += num_bits;
1789  }
1790 
1791  SetRoadOwner(tile, rt, new_owner == INVALID_OWNER ? OWNER_NONE : new_owner);
1792  }
1793  }
1794 
1795  if (IsLevelCrossing(tile)) {
1796  if (GetTileOwner(tile) == old_owner) {
1797  if (new_owner == INVALID_OWNER) {
1799  } else {
1800  /* Update infrastructure counts. No need to dirty windows here, we'll redraw the whole screen anyway. */
1801  Company::Get(old_owner)->infrastructure.rail[GetRailType(tile)] -= LEVELCROSSING_TRACKBIT_FACTOR;
1802  Company::Get(new_owner)->infrastructure.rail[GetRailType(tile)] += LEVELCROSSING_TRACKBIT_FACTOR;
1803 
1804  SetTileOwner(tile, new_owner);
1805  }
1806  }
1807  }
1808 }
1809 
1810 static CommandCost TerraformTile_Road(TileIndex tile, DoCommandFlag flags, int z_new, Slope tileh_new)
1811 {
1813  switch (GetRoadTileType(tile)) {
1814  case ROAD_TILE_CROSSING:
1815  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]);
1816  break;
1817 
1818  case ROAD_TILE_DEPOT:
1819  if (AutoslopeCheckForEntranceEdge(tile, z_new, tileh_new, GetRoadDepotDirection(tile))) return CommandCost(EXPENSES_CONSTRUCTION, _price[PR_BUILD_FOUNDATION]);
1820  break;
1821 
1822  case ROAD_TILE_NORMAL: {
1823  RoadBits bits = GetAllRoadBits(tile);
1824  RoadBits bits_copy = bits;
1825  /* Check if the slope-road_bits combination is valid at all, i.e. it is safe to call GetRoadFoundation(). */
1826  if (CheckRoadSlope(tileh_new, &bits_copy, ROAD_NONE, ROAD_NONE).Succeeded()) {
1827  /* CheckRoadSlope() sometimes changes the road_bits, if it does not agree with them. */
1828  if (bits == bits_copy) {
1829  int z_old;
1830  Slope tileh_old = GetTileSlope(tile, &z_old);
1831 
1832  /* Get the slope on top of the foundation */
1833  z_old += ApplyFoundationToSlope(GetRoadFoundation(tileh_old, bits), &tileh_old);
1834  z_new += ApplyFoundationToSlope(GetRoadFoundation(tileh_new, bits), &tileh_new);
1835 
1836  /* The surface slope must not be changed */
1837  if ((z_old == z_new) && (tileh_old == tileh_new)) return CommandCost(EXPENSES_CONSTRUCTION, _price[PR_BUILD_FOUNDATION]);
1838  }
1839  }
1840  break;
1841  }
1842 
1843  default: NOT_REACHED();
1844  }
1845  }
1846 
1847  return DoCommand(tile, 0, 0, flags, CMD_LANDSCAPE_CLEAR);
1848 }
1849 
1851 extern const TileTypeProcs _tile_type_road_procs = {
1852  DrawTile_Road, // draw_tile_proc
1853  GetSlopePixelZ_Road, // get_slope_z_proc
1854  ClearTile_Road, // clear_tile_proc
1855  NULL, // add_accepted_cargo_proc
1856  GetTileDesc_Road, // get_tile_desc_proc
1857  GetTileTrackStatus_Road, // get_tile_track_status_proc
1858  ClickTile_Road, // click_tile_proc
1859  NULL, // animate_tile_proc
1860  TileLoop_Road, // tile_loop_proc
1861  ChangeTileOwner_Road, // change_tile_owner_proc
1862  NULL, // add_produced_cargo_proc
1863  VehicleEnter_Road, // vehicle_enter_tile_proc
1864  GetFoundation_Road, // get_foundation_proc
1865  TerraformTile_Road, // terraform_tile_proc
1866 };