# tunnelbridge_cmd.cpp

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    00001 /* $Id: tunnelbridge_cmd.cpp 17346 2009-09-01 13:16:53Z rubidium $ */
    00002
    00008 #include "stdafx.h"
    00009 #include "openttd.h"
    00010 #include "rail_map.h"
    00011 #include "landscape.h"
    00012 #include "unmovable_map.h"
    00013 #include "viewport_func.h"
    00014 #include "command_func.h"
    00015 #include "town.h"
    00016 #include "variables.h"
    00017 #include "train.h"
    00018 #include "water_map.h"
    00019 #include "yapf/yapf.h"
    00020 #include "newgrf_sound.h"
    00021 #include "autoslope.h"
    00022 #include "tunnelbridge_map.h"
    00023 #include "strings_func.h"
    00024 #include "date_func.h"
    00025 #include "functions.h"
    00026 #include "vehicle_func.h"
    00027 #include "sound_func.h"
    00028 #include "tunnelbridge.h"
    00029 #include "engine_base.h"
    00030 #include "cheat_type.h"
    00031 #include "elrail_func.h"
    00032 #include "landscape_type.h"
    00033
    00034 #include "table/sprites.h"
    00035 #include "table/strings.h"
    00036 #include "table/bridge_land.h"
    00037
    00038 BridgeSpec _bridge[MAX_BRIDGES];
    00039 TileIndex _build_tunnel_endtile;
    00040
    00042 void ResetBridges()
    00043 {
    00044   /* First, free sprite table data */
    00045   for (BridgeType i = 0; i < MAX_BRIDGES; i++) {
    00046     if (_bridge[i].sprite_table != NULL) {
    00047       for (BridgePieces j = BRIDGE_PIECE_NORTH; j < BRIDGE_PIECE_INVALID; j++) free(_bridge[i].sprite_table[j]);
    00048       free(_bridge[i].sprite_table);
    00049     }
    00050   }
    00051
    00052   /* Then, wipe out current bidges */
    00053   memset(&_bridge, 0, sizeof(_bridge));
    00054   /* And finally, reinstall default data */
    00055   memcpy(&_bridge, &_orig_bridge, sizeof(_orig_bridge));
    00056 }
    00057
    00061 int CalcBridgeLenCostFactor(int x)
    00062 {
    00063   int n;
    00064   int r;
    00065
    00066   if (x < 2) return x;
    00067   x -= 2;
    00068   for (n = 0, r = 2;; n++) {
    00069     if (x <= n) return r + x * n;
    00070     r += n * n;
    00071     x -= n;
    00072   }
    00073 }
    00074
    00075 Foundation GetBridgeFoundation(Slope tileh, Axis axis)
    00076 {
    00077   if ((tileh == SLOPE_FLAT) ||
    00078       (((tileh == SLOPE_NE) || (tileh == SLOPE_SW)) && (axis == AXIS_X)) ||
    00079       (((tileh == SLOPE_NW) || (tileh == SLOPE_SE)) && (axis == AXIS_Y))) return FOUNDATION_NONE;
    00080
    00081   return (HasSlopeHighestCorner(tileh) ? InclinedFoundation(axis) : FlatteningFoundation(tileh));
    00082 }
    00083
    00091 bool HasBridgeFlatRamp(Slope tileh, Axis axis)
    00092 {
    00093   ApplyFoundationToSlope(GetBridgeFoundation(tileh, axis), &tileh);
    00094   /* If the foundation slope is flat the bridge has a non-flat ramp and vice versa. */
    00095   return (tileh != SLOPE_FLAT);
    00096 }
    00097
    00098 static inline const PalSpriteID *GetBridgeSpriteTable(int index, BridgePieces table)
    00099 {
    00100   const BridgeSpec *bridge = GetBridgeSpec(index);
    00101   assert(table < BRIDGE_PIECE_INVALID);
    00102   if (bridge->sprite_table == NULL || bridge->sprite_table[table] == NULL) {
    00103     return _bridge_sprite_table[index][table];
    00104   } else {
    00105     return bridge->sprite_table[table];
    00106   }
    00107 }
    00108
    00109
    00118 static CommandCost CheckBridgeSlopeNorth(Axis axis, Slope *tileh, uint *z)
    00119 {
    00120   Foundation f = GetBridgeFoundation(*tileh, axis);
    00121   *z += ApplyFoundationToSlope(f, tileh);
    00122
    00123   Slope valid_inclined = (axis == AXIS_X ? SLOPE_NE : SLOPE_NW);
    00124   if ((*tileh != SLOPE_FLAT) && (*tileh != valid_inclined)) return CMD_ERROR;
    00125
    00126   if (f == FOUNDATION_NONE) return CommandCost();
    00127
    00128   return CommandCost(EXPENSES_CONSTRUCTION, _price.terraform);
    00129 }
    00130
    00139 static CommandCost CheckBridgeSlopeSouth(Axis axis, Slope *tileh, uint *z)
    00140 {
    00141   Foundation f = GetBridgeFoundation(*tileh, axis);
    00142   *z += ApplyFoundationToSlope(f, tileh);
    00143
    00144   Slope valid_inclined = (axis == AXIS_X ? SLOPE_SW : SLOPE_SE);
    00145   if ((*tileh != SLOPE_FLAT) && (*tileh != valid_inclined)) return CMD_ERROR;
    00146
    00147   if (f == FOUNDATION_NONE) return CommandCost();
    00148
    00149   return CommandCost(EXPENSES_CONSTRUCTION, _price.terraform);
    00150 }
    00151
    00152 bool CheckBridge_Stuff(BridgeType bridge_type, uint bridge_len, DoCommandFlag flags)
    00153 {
    00154   if (flags & DC_QUERY_COST) {
    00155     return bridge_len <= (_settings_game.construction.longbridges ? 100U : 16U);
    00156   }
    00157
    00158   if (bridge_type >= MAX_BRIDGES) return false;
    00159
    00160   const BridgeSpec *b = GetBridgeSpec(bridge_type);
    00161   if (b->avail_year > _cur_year) return false;
    00162
    00163   uint max = b->max_length;
    00164   if (max >= 16 && _settings_game.construction.longbridges) max = 100;
    00165
    00166   return b->min_length <= bridge_len && bridge_len <= max;
    00167 }
    00168
    00178 CommandCost CmdBuildBridge(TileIndex end_tile, DoCommandFlag flags, uint32 p1, uint32 p2, const char *text)
    00179 {
    00180   BridgeType bridge_type;
    00181   RailType railtype = INVALID_RAILTYPE;
    00182   RoadTypes roadtypes = ROADTYPES_NONE;
    00183   uint x;
    00184   uint y;
    00185   uint sx;
    00186   uint sy;
    00187   TileIndex tile_start;
    00188   TileIndex tile_end;
    00189   Slope tileh_start;
    00190   Slope tileh_end;
    00191   uint z_start;
    00192   uint z_end;
    00193   TileIndex tile;
    00194   TileIndexDiff delta;
    00195   uint bridge_len;
    00196   Axis direction;
    00197   CommandCost cost(EXPENSES_CONSTRUCTION);
    00198   CommandCost ret;
    00199   bool replace_bridge = false;
    00200   BridgeType replaced_bridge_type;
    00201   TransportType transport_type;
    00202
    00203   /* unpack parameters */
    00204   bridge_type = GB(p2, 0, 8);
    00205
    00206   if (p1 >= MapSize()) return CMD_ERROR;
    00207
    00208   transport_type = (TransportType)GB(p2, 15, 2);
    00209
    00210   /* type of bridge */
    00211   switch (transport_type) {
    00212     case TRANSPORT_ROAD:
    00213       roadtypes = (RoadTypes)GB(p2, 8, 2);
    00214       if (!AreValidRoadTypes(roadtypes) || !HasRoadTypesAvail(_current_company, roadtypes)) return CMD_ERROR;
    00215       break;
    00216
    00217     case TRANSPORT_RAIL:
    00218       railtype = (RailType)GB(p2, 8, 7);
    00219       if (!ValParamRailtype(railtype)) return CMD_ERROR;
    00220       break;
    00221
    00222     case TRANSPORT_WATER:
    00223       break;
    00224
    00225     default:
    00226       /* Airports don't have tunnels. */
    00227       return CMD_ERROR;
    00228   }
    00229
    00230   x = TileX(end_tile);
    00231   y = TileY(end_tile);
    00232   sx = TileX(p1);
    00233   sy = TileY(p1);
    00234
    00235   /* check if valid, and make sure that (x,y) are smaller than (sx,sy) */
    00236   if (x == sx) {
    00237     if (y == sy) return_cmd_error(STR_5008_CANNOT_START_AND_END_ON);
    00238     direction = AXIS_Y;
    00239     if (y > sy) Swap(y, sy);
    00240   } else if (y == sy) {
    00241     direction = AXIS_X;
    00242     if (x > sx) Swap(x, sx);
    00243   } else {
    00244     return_cmd_error(STR_500A_START_AND_END_MUST_BE_IN);
    00245   }
    00246
    00247   bridge_len = sx + sy - x - y - 1;
    00248   if (transport_type != TRANSPORT_WATER) {
    00249     /* set and test bridge length, availability */
    00250     if (!CheckBridge_Stuff(bridge_type, bridge_len, flags)) return_cmd_error(STR_5015_CAN_T_BUILD_BRIDGE_HERE);
    00251   }
    00252
    00253   /* retrieve landscape height and ensure it's on land */
    00254   tile_start = TileXY(x, y);
    00255   tile_end = TileXY(sx, sy);
    00256   if (IsWaterTile(tile_start) || IsWaterTile(tile_end)) {
    00257     return_cmd_error(STR_02A0_ENDS_OF_BRIDGE_MUST_BOTH);
    00258   }
    00259
    00260   tileh_start = GetTileSlope(tile_start, &z_start);
    00261   tileh_end = GetTileSlope(tile_end, &z_end);
    00262
    00263   CommandCost terraform_cost_north = CheckBridgeSlopeNorth(direction, &tileh_start, &z_start);
    00264   CommandCost terraform_cost_south = CheckBridgeSlopeSouth(direction, &tileh_end,   &z_end);
    00265
    00266   if (z_start != z_end) return_cmd_error(STR_BRIDGEHEADS_NOT_SAME_HEIGHT);
    00267
    00268   if (IsBridgeTile(tile_start) && IsBridgeTile(tile_end) &&
    00269       GetOtherBridgeEnd(tile_start) == tile_end &&
    00270       GetTunnelBridgeTransportType(tile_start) == transport_type) {
    00271     /* Replace a current bridge. */
    00272
    00273     /* If this is a railway bridge, make sure the railtypes match. */
    00274     if (transport_type == TRANSPORT_RAIL && GetRailType(tile_start) != railtype) {
    00275       return_cmd_error(STR_5007_MUST_DEMOLISH_BRIDGE_FIRST);
    00276     }
    00277
    00278     /* Do not replace town bridges with lower speed bridges. */
    00279     if (!(flags & DC_QUERY_COST) && IsTileOwner(tile_start, OWNER_TOWN) &&
    00280         GetBridgeSpec(bridge_type)->speed < GetBridgeSpec(GetBridgeType(tile_start))->speed) {
    00281       Town *t = ClosestTownFromTile(tile_start, UINT_MAX);
    00282
    00283       if (t == NULL) {
    00284         return CMD_ERROR;
    00285       } else {
    00286         SetDParam(0, t->index);
    00287         return_cmd_error(STR_2009_LOCAL_AUTHORITY_REFUSES);
    00288       }
    00289     }
    00290
    00291     /* Do not replace the bridge with the same bridge type. */
    00292     if (!(flags & DC_QUERY_COST) && bridge_type == GetBridgeType(tile_start)) {
    00293       return_cmd_error(STR_1007_ALREADY_BUILT);
    00294     }
    00295
    00296     /* Do not allow replacing another company's bridges. */
    00297     if (!IsTileOwner(tile_start, _current_company) && !IsTileOwner(tile_start, OWNER_TOWN)) {
    00298       return_cmd_error(STR_1024_AREA_IS_OWNED_BY_ANOTHER);
    00299     }
    00300
    00301     cost.AddCost((bridge_len + 1) * _price.clear_bridge); // The cost of clearing the current bridge.
    00302     replace_bridge = true;
    00303     replaced_bridge_type = GetBridgeType(tile_start);
    00304
    00305     /* Do not remove road types when upgrading a bridge */
    00306     roadtypes |= GetRoadTypes(tile_start);
    00307   } else {
    00308     /* Build a new bridge. */
    00309
    00310     bool allow_on_slopes = (_settings_game.construction.build_on_slopes && transport_type != TRANSPORT_WATER);
    00311
    00312     /* Try and clear the start landscape */
    00313     ret = DoCommand(tile_start, 0, 0, flags, CMD_LANDSCAPE_CLEAR);
    00314     if (CmdFailed(ret)) return ret;
    00315     cost = ret;
    00316
    00317     if (CmdFailed(terraform_cost_north) || (terraform_cost_north.GetCost() != 0 && !allow_on_slopes))
    00318       return_cmd_error(STR_1000_LAND_SLOPED_IN_WRONG_DIRECTION);
    00319     cost.AddCost(terraform_cost_north);
    00320
    00321     /* Try and clear the end landscape */
    00322     ret = DoCommand(tile_end, 0, 0, flags, CMD_LANDSCAPE_CLEAR);
    00323     if (CmdFailed(ret)) return ret;
    00324     cost.AddCost(ret);
    00325
    00326     /* false - end tile slope check */
    00327     if (CmdFailed(terraform_cost_south) || (terraform_cost_south.GetCost() != 0 && !allow_on_slopes))
    00328       return_cmd_error(STR_1000_LAND_SLOPED_IN_WRONG_DIRECTION);
    00329     cost.AddCost(terraform_cost_south);
    00330
    00331     if (transport_type == TRANSPORT_WATER && (tileh_start == SLOPE_FLAT || tileh_end == SLOPE_FLAT)) return_cmd_error(STR_1000_LAND_SLOPED_IN_WRONG_DIRECTION);
    00332   }
    00333
    00334   if (!replace_bridge) {
    00335     TileIndex Heads[] = {tile_start, tile_end};
    00336     int i;
    00337
    00338     for (i = 0; i < 2; i++) {
    00339       if (MayHaveBridgeAbove(Heads[i])) {
    00340         if (IsBridgeAbove(Heads[i])) {
    00341           TileIndex north_head = GetNorthernBridgeEnd(Heads[i]);
    00342
    00343           if (direction == GetBridgeAxis(Heads[i])) return_cmd_error(STR_5007_MUST_DEMOLISH_BRIDGE_FIRST);
    00344
    00345           if (z_start + TILE_HEIGHT == GetBridgeHeight(north_head)) {
    00346             return_cmd_error(STR_5007_MUST_DEMOLISH_BRIDGE_FIRST);
    00347           }
    00348         }
    00349       }
    00350     }
    00351   }
    00352
    00353   /* do the drill? */
    00354   if (flags & DC_EXEC) {
    00355     DiagDirection dir = AxisToDiagDir(direction);
    00356     Owner owner = replace_bridge ? GetTileOwner(tile_start) : _current_company;
    00357
    00358     switch (transport_type) {
    00359       case TRANSPORT_RAIL:
    00360         MakeRailBridgeRamp(tile_start, owner, bridge_type, dir,                 railtype);
    00361         MakeRailBridgeRamp(tile_end,   owner, bridge_type, ReverseDiagDir(dir), railtype);
    00362         break;
    00363
    00364       case TRANSPORT_ROAD:
    00365         MakeRoadBridgeRamp(tile_start, owner, bridge_type, dir,                 roadtypes);
    00366         MakeRoadBridgeRamp(tile_end,   owner, bridge_type, ReverseDiagDir(dir), roadtypes);
    00367         break;
    00368
    00369       case TRANSPORT_WATER:
    00370         MakeAqueductBridgeRamp(tile_start, owner, dir);
    00371         MakeAqueductBridgeRamp(tile_end,   owner, ReverseDiagDir(dir));
    00372         break;
    00373
    00374       default:
    00375         NOT_REACHED();
    00376         break;
    00377     }
    00378     MarkTileDirtyByTile(tile_start);
    00379     MarkTileDirtyByTile(tile_end);
    00380   }
    00381
    00382   delta = (direction == AXIS_X ? TileDiffXY(1, 0) : TileDiffXY(0, 1));
    00383   for (tile = tile_start + delta; tile != tile_end; tile += delta) {
    00384     if (GetTileMaxZ(tile) > z_start) return_cmd_error(STR_BRIDGE_TOO_LOW_FOR_TERRAIN);
    00385
    00386     if (MayHaveBridgeAbove(tile) && IsBridgeAbove(tile) && !replace_bridge) {
    00387       /* Disallow crossing bridges for the time being */
    00388       return_cmd_error(STR_5007_MUST_DEMOLISH_BRIDGE_FIRST);
    00389     }
    00390
    00391     switch (GetTileType(tile)) {
    00392       case MP_WATER:
    00393         if (!IsWater(tile) && !IsCoast(tile)) goto not_valid_below;
    00394         break;
    00395
    00396       case MP_RAILWAY:
    00397         if (!IsPlainRail(tile)) goto not_valid_below;
    00398         break;
    00399
    00400       case MP_ROAD:
    00401         if (IsRoadDepot(tile)) goto not_valid_below;
    00402         break;
    00403
    00404       case MP_TUNNELBRIDGE:
    00405         if (IsTunnel(tile)) break;
    00406         if (replace_bridge) break;
    00407         if (direction == DiagDirToAxis(GetTunnelBridgeDirection(tile))) goto not_valid_below;
    00408         if (z_start < GetBridgeHeight(tile)) goto not_valid_below;
    00409         break;
    00410
    00411       case MP_UNMOVABLE:
    00412         if (!IsOwnedLand(tile)) goto not_valid_below;
    00413         break;
    00414
    00415       case MP_CLEAR:
    00416         break;
    00417
    00418       default:
    00419 not_valid_below:;
    00420         /* try and clear the middle landscape */
    00421         ret = DoCommand(tile, 0, 0, flags, CMD_LANDSCAPE_CLEAR);
    00422         if (CmdFailed(ret)) return ret;
    00423         cost.AddCost(ret);
    00424         break;
    00425     }
    00426
    00427     if (flags & DC_EXEC) {
    00428       SetBridgeMiddle(tile, direction);
    00429       MarkTileDirtyByTile(tile);
    00430     }
    00431   }
    00432
    00433   if (flags & DC_EXEC && transport_type == TRANSPORT_RAIL) {
    00434     Track track = AxisToTrack(direction);
    00435     AddSideToSignalBuffer(tile_start, INVALID_DIAGDIR, _current_company);
    00436     YapfNotifyTrackLayoutChange(tile_start, track);
    00437   }
    00438
    00439   /* for human player that builds the bridge he gets a selection to choose from bridges (DC_QUERY_COST)
    00440    * It's unnecessary to execute this command every time for every bridge. So it is done only
    00441    * and cost is computed in "bridge_gui.c". For AI, Towns this has to be of course calculated
    00442    */
    00443   if (!(flags & DC_QUERY_COST) || (IsValidCompanyID(_current_company) && GetCompany(_current_company)->is_ai)) {
    00444     bridge_len += 2; // begin and end tiles/ramps
    00445
    00446     if (IsValidCompanyID(_current_company))
    00447       bridge_len = CalcBridgeLenCostFactor(bridge_len);
    00448
    00449     cost.AddCost((int64)bridge_len * _price.build_bridge * GetBridgeSpec(bridge_type)->price >> 8);
    00450
    00451     /* Aqueducts are a little more expensive. */
    00452     if (transport_type == TRANSPORT_WATER) cost.AddCost((int64)bridge_len * _price.clear_water);
    00453   }
    00454
    00455   return cost;
    00456 }
    00457
    00458
    00465 CommandCost CmdBuildTunnel(TileIndex start_tile, DoCommandFlag flags, uint32 p1, uint32 p2, const char *text)
    00466 {
    00467   TileIndexDiff delta;
    00468   TileIndex end_tile;
    00469   DiagDirection direction;
    00470   Slope start_tileh;
    00471   Slope end_tileh;
    00472   TransportType transport_type = (TransportType)GB(p1, 9, 1);
    00473   uint start_z;
    00474   uint end_z;
    00475   CommandCost cost(EXPENSES_CONSTRUCTION);
    00476   CommandCost ret;
    00477
    00478   _build_tunnel_endtile = 0;
    00479   if (transport_type == TRANSPORT_RAIL) {
    00480     if (!ValParamRailtype((RailType)p1)) return CMD_ERROR;
    00481   } else {
    00482     const RoadTypes rts = (RoadTypes)GB(p1, 0, 2);
    00483     if (!AreValidRoadTypes(rts) || !HasRoadTypesAvail(_current_company, rts)) return CMD_ERROR;
    00484   }
    00485
    00486   start_tileh = GetTileSlope(start_tile, &start_z);
    00487   direction = GetInclinedSlopeDirection(start_tileh);
    00488   if (direction == INVALID_DIAGDIR) return_cmd_error(STR_500B_SITE_UNSUITABLE_FOR_TUNNEL);
    00489
    00490   if (IsWaterTile(start_tile)) return_cmd_error(STR_3807_CAN_T_BUILD_ON_WATER);
    00491
    00492   ret = DoCommand(start_tile, 0, 0, flags, CMD_LANDSCAPE_CLEAR);
    00493   if (CmdFailed(ret)) return ret;
    00494
    00495   /* XXX - do NOT change 'ret' in the loop, as it is used as the price
    00496    * for the clearing of the entrance of the tunnel. Assigning it to
    00497    * cost before the loop will yield different costs depending on start-
    00498    * position, because of increased-cost-by-length: 'cost += cost >> 3' */
    00499
    00500   delta = TileOffsByDiagDir(direction);
    00501   DiagDirection tunnel_in_way_dir;
    00502   if (DiagDirToAxis(direction) == AXIS_Y) {
    00503     tunnel_in_way_dir = (TileX(start_tile) < (MapMaxX() / 2)) ? DIAGDIR_SW : DIAGDIR_NE;
    00504   } else {
    00505     tunnel_in_way_dir = (TileY(start_tile) < (MapMaxX() / 2)) ? DIAGDIR_SE : DIAGDIR_NW;
    00506   }
    00507
    00508   end_tile = start_tile;
    00509
    00511   int tiles_coef = 3;
    00513   int tiles = 0;
    00515   int tiles_bump = 25;
    00516
    00517   for (;;) {
    00518     end_tile += delta;
    00519     if (!IsValidTile(end_tile)) return_cmd_error(STR_TUNNEL_THROUGH_MAP_BORDER);
    00520     end_tileh = GetTileSlope(end_tile, &end_z);
    00521
    00522     if (start_z == end_z) break;
    00523
    00524     if (!_cheats.crossing_tunnels.value && IsTunnelInWayDir(end_tile, start_z, tunnel_in_way_dir)) {
    00525       return_cmd_error(STR_5003_ANOTHER_TUNNEL_IN_THE_WAY);
    00526     }
    00527
    00528     tiles++;
    00529     if (tiles == tiles_bump) {
    00530       tiles_coef++;
    00531       tiles_bump *= 2;
    00532     }
    00533
    00534     cost.AddCost(_price.build_tunnel);
    00535     cost.AddCost(cost.GetCost() >> tiles_coef); // add a multiplier for longer tunnels
    00536   }
    00537
    00538   /* Add the cost of the entrance */
    00539   cost.AddCost(_price.build_tunnel);
    00540   cost.AddCost(ret);
    00541
    00542   /* if the command fails from here on we want the end tile to be highlighted */
    00543   _build_tunnel_endtile = end_tile;
    00544
    00545   if (IsWaterTile(end_tile)) return_cmd_error(STR_3807_CAN_T_BUILD_ON_WATER);
    00546
    00547   /* slope of end tile must be complementary to the slope of the start tile */
    00548   if (end_tileh != ComplementSlope(start_tileh)) {
    00549     /* Check if there is a structure on the terraformed tile. Do not add the cost, that will be done by the terraforming
    00550      * Note: Currently the town rating is also affected by this clearing-test. So effectivly the player is punished twice for clearing
    00551      *       the tree on end_tile.
    00552      */
    00553     ret = DoCommand(end_tile, 0, 0, DC_AUTO, CMD_LANDSCAPE_CLEAR);
    00554     if (CmdFailed(ret)) return_cmd_error(STR_5005_UNABLE_TO_EXCAVATE_LAND);
    00555
    00556     ret = DoCommand(end_tile, end_tileh & start_tileh, 0, flags, CMD_TERRAFORM_LAND);
    00557     if (CmdFailed(ret)) return_cmd_error(STR_5005_UNABLE_TO_EXCAVATE_LAND);
    00558   } else {
    00559     ret = DoCommand(end_tile, 0, 0, flags, CMD_LANDSCAPE_CLEAR);
    00560     if (CmdFailed(ret)) return ret;
    00561   }
    00562   cost.AddCost(_price.build_tunnel);
    00563   cost.AddCost(ret);
    00564
    00565   if (flags & DC_EXEC) {
    00566     if (transport_type == TRANSPORT_RAIL) {
    00567       MakeRailTunnel(start_tile, _current_company, direction,                 (RailType)GB(p1, 0, 4));
    00568       MakeRailTunnel(end_tile,   _current_company, ReverseDiagDir(direction), (RailType)GB(p1, 0, 4));
    00569       AddSideToSignalBuffer(start_tile, INVALID_DIAGDIR, _current_company);
    00570       YapfNotifyTrackLayoutChange(start_tile, DiagDirToDiagTrack(direction));
    00571     } else {
    00572       MakeRoadTunnel(start_tile, _current_company, direction,                 (RoadTypes)GB(p1, 0, 2));
    00573       MakeRoadTunnel(end_tile,   _current_company, ReverseDiagDir(direction), (RoadTypes)GB(p1, 0, 2));
    00574     }
    00575   }
    00576
    00577   return cost;
    00578 }
    00579
    00580
    00581 static inline bool CheckAllowRemoveTunnelBridge(TileIndex tile)
    00582 {
    00583   /* Floods can remove anything as well as the scenario editor */
    00584   if (_current_company == OWNER_WATER || _game_mode == GM_EDITOR) return true;
    00585
    00586   switch (GetTunnelBridgeTransportType(tile)) {
    00587     case TRANSPORT_ROAD: {
    00588       RoadTypes rts = GetRoadTypes(tile);
    00589       Owner road_owner = _current_company;
    00590       Owner tram_owner = _current_company;
    00591
    00592       if (HasBit(rts, ROADTYPE_ROAD)) road_owner = GetRoadOwner(tile, ROADTYPE_ROAD);
    00593       if (HasBit(rts, ROADTYPE_TRAM)) tram_owner = GetRoadOwner(tile, ROADTYPE_TRAM);
    00594
    00595       /* We can remove unowned road and if the town allows it */
    00596       if (road_owner == OWNER_TOWN && !(_settings_game.construction.extra_dynamite || _cheats.magic_bulldozer.value)) return CheckTileOwnership(tile);
    00597       if (road_owner == OWNER_NONE || road_owner == OWNER_TOWN) road_owner = _current_company;
    00598       if (tram_owner == OWNER_NONE) tram_owner = _current_company;
    00599
    00600       return CheckOwnership(road_owner) && CheckOwnership(tram_owner);
    00601     }
    00602
    00603     case TRANSPORT_RAIL:
    00604     case TRANSPORT_WATER:
    00605       return CheckOwnership(GetTileOwner(tile));
    00606
    00607     default: NOT_REACHED();
    00608   }
    00609 }
    00610
    00611 static CommandCost DoClearTunnel(TileIndex tile, DoCommandFlag flags)
    00612 {
    00613   Town *t = NULL;
    00614   TileIndex endtile;
    00615
    00616   if (!CheckAllowRemoveTunnelBridge(tile)) return CMD_ERROR;
    00617
    00618   endtile = GetOtherTunnelEnd(tile);
    00619
    00620   if (HasVehicleOnTunnelBridge(tile, endtile)) return CMD_ERROR;
    00621
    00622   _build_tunnel_endtile = endtile;
    00623
    00624   if (IsTileOwner(tile, OWNER_TOWN) && _game_mode != GM_EDITOR) {
    00625     t = ClosestTownFromTile(tile, UINT_MAX); // town penalty rating
    00626
    00627     /* Check if you are allowed to remove the tunnel owned by a town
    00628      * Removal depends on difficulty settings */
    00629     if (!CheckforTownRating(flags, t, TUNNELBRIDGE_REMOVE)) {
    00630       SetDParam(0, t->index);
    00631       return_cmd_error(STR_2009_LOCAL_AUTHORITY_REFUSES);
    00632     }
    00633   }
    00634
    00635   /* checks if the owner is town then decrease town rating by RATING_TUNNEL_BRIDGE_DOWN_STEP until
    00636    * you have a "Poor" (0) town rating */
    00637   if (IsTileOwner(tile, OWNER_TOWN) && _game_mode != GM_EDITOR) {
    00638     ChangeTownRating(t, RATING_TUNNEL_BRIDGE_DOWN_STEP, RATING_TUNNEL_BRIDGE_MINIMUM, flags);
    00639   }
    00640
    00641   if (flags & DC_EXEC) {
    00642     if (GetTunnelBridgeTransportType(tile) == TRANSPORT_RAIL) {
    00643       /* We first need to request values before calling DoClearSquare */
    00644       DiagDirection dir = GetTunnelBridgeDirection(tile);
    00645       Track track = DiagDirToDiagTrack(dir);
    00646       Owner owner = GetTileOwner(tile);
    00647
    00648       Vehicle *v = NULL;
    00649       if (GetTunnelBridgeReservation(tile)) {
    00650         v = GetTrainForReservation(tile, track);
    00651         if (v != NULL) FreeTrainTrackReservation(v);
    00652       }
    00653
    00654       DoClearSquare(tile);
    00655       DoClearSquare(endtile);
    00656
    00657       /* cannot use INVALID_DIAGDIR for signal update because the tunnel doesn't exist anymore */
    00658       AddSideToSignalBuffer(tile,    ReverseDiagDir(dir), owner);
    00659       AddSideToSignalBuffer(endtile, dir,                 owner);
    00660
    00661       YapfNotifyTrackLayoutChange(tile,    track);
    00662       YapfNotifyTrackLayoutChange(endtile, track);
    00663
    00664       if (v != NULL) TryPathReserve(v);
    00665     } else {
    00666       DoClearSquare(tile);
    00667       DoClearSquare(endtile);
    00668     }
    00669   }
    00670   return CommandCost(EXPENSES_CONSTRUCTION, _price.clear_tunnel * (GetTunnelBridgeLength(tile, endtile) + 2));
    00671 }
    00672
    00673
    00674 static CommandCost DoClearBridge(TileIndex tile, DoCommandFlag flags)
    00675 {
    00676   DiagDirection direction;
    00677   TileIndexDiff delta;
    00678   TileIndex endtile;
    00679   Town *t = NULL;
    00680
    00681   if (!CheckAllowRemoveTunnelBridge(tile)) return CMD_ERROR;
    00682
    00683   endtile = GetOtherBridgeEnd(tile);
    00684
    00685   if (HasVehicleOnTunnelBridge(tile, endtile)) return CMD_ERROR;
    00686
    00687   direction = GetTunnelBridgeDirection(tile);
    00688   delta = TileOffsByDiagDir(direction);
    00689
    00690   if (IsTileOwner(tile, OWNER_TOWN) && _game_mode != GM_EDITOR) {
    00691     t = ClosestTownFromTile(tile, UINT_MAX); // town penalty rating
    00692
    00693     /* Check if you are allowed to remove the bridge owned by a town
    00694      * Removal depends on difficulty settings */
    00695     if (!CheckforTownRating(flags, t, TUNNELBRIDGE_REMOVE)) {
    00696       SetDParam(0, t->index);
    00697       return_cmd_error(STR_2009_LOCAL_AUTHORITY_REFUSES);
    00698     }
    00699   }
    00700
    00701   /* checks if the owner is town then decrease town rating by RATING_TUNNEL_BRIDGE_DOWN_STEP until
    00702    * you have a "Poor" (0) town rating */
    00703   if (IsTileOwner(tile, OWNER_TOWN) && _game_mode != GM_EDITOR) {
    00704     ChangeTownRating(t, RATING_TUNNEL_BRIDGE_DOWN_STEP, RATING_TUNNEL_BRIDGE_MINIMUM, flags);
    00705   }
    00706
    00707   if (flags & DC_EXEC) {
    00708     /* read this value before actual removal of bridge */
    00709     bool rail = GetTunnelBridgeTransportType(tile) == TRANSPORT_RAIL;
    00710     Owner owner = GetTileOwner(tile);
    00711     uint height = GetBridgeHeight(tile);
    00712     Vehicle *v = NULL;
    00713
    00714     if (rail && GetTunnelBridgeReservation(tile)) {
    00715       v = GetTrainForReservation(tile, DiagDirToDiagTrack(direction));
    00716       if (v != NULL) FreeTrainTrackReservation(v);
    00717     }
    00718
    00719     DoClearSquare(tile);
    00720     DoClearSquare(endtile);
    00721     for (TileIndex c = tile + delta; c != endtile; c += delta) {
    00722       /* do not let trees appear from 'nowhere' after removing bridge */
    00723       if (IsNormalRoadTile(c) && GetRoadside(c) == ROADSIDE_TREES) {
    00724         uint minz = GetTileMaxZ(c) + 3 * TILE_HEIGHT;
    00725         if (height < minz) SetRoadside(c, ROADSIDE_PAVED);
    00726       }
    00727       ClearBridgeMiddle(c);
    00728       MarkTileDirtyByTile(c);
    00729     }
    00730
    00731     if (rail) {
    00732       /* cannot use INVALID_DIAGDIR for signal update because the bridge doesn't exist anymore */
    00733       AddSideToSignalBuffer(tile,    ReverseDiagDir(direction), owner);
    00734       AddSideToSignalBuffer(endtile, direction,                 owner);
    00735
    00736       Track track = DiagDirToDiagTrack(direction);
    00737       YapfNotifyTrackLayoutChange(tile,    track);
    00738       YapfNotifyTrackLayoutChange(endtile, track);
    00739
    00740       if (v != NULL) TryPathReserve(v, true);
    00741     }
    00742   }
    00743
    00744   return CommandCost(EXPENSES_CONSTRUCTION, (GetTunnelBridgeLength(tile, endtile) + 2) * _price.clear_bridge);
    00745 }
    00746
    00747 static CommandCost ClearTile_TunnelBridge(TileIndex tile, DoCommandFlag flags)
    00748 {
    00749   if (IsTunnel(tile)) {
    00750     if (flags & DC_AUTO) return_cmd_error(STR_5006_MUST_DEMOLISH_TUNNEL_FIRST);
    00751     return DoClearTunnel(tile, flags);
    00752   } else { // IsBridge(tile)
    00753     if (flags & DC_AUTO) return_cmd_error(STR_5007_MUST_DEMOLISH_BRIDGE_FIRST);
    00754     return DoClearBridge(tile, flags);
    00755   }
    00756
    00757   return CMD_ERROR;
    00758 }
    00759
    00771 static void DrawBridgePillars(const PalSpriteID *psid, const TileInfo *ti, Axis axis, bool drawfarpillar, int x, int y, int z_bridge)
    00772 {
    00773   /* Do not draw bridge pillars if they are invisible */
    00774   if (IsInvisibilitySet(TO_BRIDGES)) return;
    00775
    00776   SpriteID image = psid->sprite;
    00777
    00778   if (image != 0) {
    00779     /* "side" specifies the side the pillars stand on.
    00780      * The length of the pillars is then set to the height of the bridge over the corners of this edge.
    00781      *
    00782      *                axis==AXIS_X  axis==AXIS_Y
    00783      *   side==false      SW            NW
    00784      *   side==true       NE            SE
    00785      *
    00786      * I have no clue, why this was done this way.
    00787      */
    00788     bool side = HasBit(image, 0);
    00789
    00790     /* "dir" means the edge the pillars stand on */
    00791     DiagDirection dir = AxisToDiagDir(axis);
    00792     if (side != (axis == AXIS_Y)) dir = ReverseDiagDir(dir);
    00793
    00794     /* Determine ground height under pillars */
    00795     int front_height = ti->z;
    00796     int back_height = ti->z;
    00797     GetSlopeZOnEdge(ti->tileh, dir, &front_height, &back_height);
    00798
    00799     /* x and y size of bounding-box of pillars */
    00800     int w = (axis == AXIS_X ? 16 : 2);
    00801     int h = (axis == AXIS_X ? 2 : 16);
    00802     /* sprite position of back facing pillar */
    00803     int x_back = x - (axis == AXIS_X ? 0 : 9);
    00804     int y_back = y - (axis == AXIS_X ? 9 : 0);
    00805
    00806     for (int cur_z = z_bridge; cur_z >= front_height || cur_z >= back_height; cur_z -= TILE_HEIGHT) {
    00807       /* Draw front facing pillar */
    00808       if (cur_z >= front_height) {
    00809         AddSortableSpriteToDraw(image, psid->pal, x, y, w, h, BB_HEIGHT_UNDER_BRIDGE - 5, cur_z, IsTransparencySet(TO_BRIDGES), 0, 0, -5);
    00810       }
    00811
    00812       /* Draw back facing pillar, but not the highest part directly under the bridge-floor */
    00813       if (drawfarpillar && cur_z >= back_height && cur_z < z_bridge - TILE_HEIGHT) {
    00814         AddSortableSpriteToDraw(image, psid->pal, x_back, y_back, w, h, BB_HEIGHT_UNDER_BRIDGE - 5, cur_z, IsTransparencySet(TO_BRIDGES), 0, 0, -5);
    00815       }
    00816     }
    00817   }
    00818 }
    00819
    00829 static void DrawBridgeTramBits(int x, int y, byte z, int offset, bool overlay, bool head)
    00830 {
    00831   static const SpriteID tram_offsets[2][6] = { { 107, 108, 109, 110, 111, 112 }, { 4, 5, 15, 16, 17, 18 } };
    00832   static const SpriteID back_offsets[6]    =   {  95,  96,  99, 102, 100, 101 };
    00833   static const SpriteID front_offsets[6]   =   {  97,  98, 103, 106, 104, 105 };
    00834
    00835   static const uint size_x[6] = {  1, 16, 16,  1, 16,  1 };
    00836   static const uint size_y[6] = { 16,  1,  1, 16,  1, 16 };
    00837   static const uint front_bb_offset_x[6] = { 15,  0,  0, 15,  0, 15 };
    00838   static const uint front_bb_offset_y[6] = {  0, 15, 15,  0, 15,  0 };
    00839
    00840   /* The sprites under the vehicles are drawn as SpriteCombine. StartSpriteCombine() has already been called
    00841    * The bounding boxes here are the same as for bridge front/roof */
    00842   if (head || !IsInvisibilitySet(TO_BRIDGES)) {
    00843     AddSortableSpriteToDraw(SPR_TRAMWAY_BASE + tram_offsets[overlay][offset], PAL_NONE,
    00844       x, y, size_x[offset], size_y[offset], 0x28, z,
    00845       !head && IsTransparencySet(TO_BRIDGES));
    00846   }
    00847
    00848   /* Do not draw catenary if it is set invisible */
    00849   if (!IsInvisibilitySet(TO_CATENARY)) {
    00850     AddSortableSpriteToDraw(SPR_TRAMWAY_BASE + back_offsets[offset], PAL_NONE,
    00851       x, y, size_x[offset], size_y[offset], 0x28, z,
    00852       IsTransparencySet(TO_CATENARY));
    00853   }
    00854
    00855   /* Start a new SpriteCombine for the front part */
    00856   EndSpriteCombine();
    00857   StartSpriteCombine();
    00858
    00859   /* For sloped sprites the bounding box needs to be higher, as the pylons stop on a higher point */
    00860   if (!IsInvisibilitySet(TO_CATENARY)) {
    00861     AddSortableSpriteToDraw(SPR_TRAMWAY_BASE + front_offsets[offset], PAL_NONE,
    00862       x, y, size_x[offset] + front_bb_offset_x[offset], size_y[offset] + front_bb_offset_y[offset], 0x28, z,
    00863       IsTransparencySet(TO_CATENARY), front_bb_offset_x[offset], front_bb_offset_y[offset]);
    00864   }
    00865 }
    00866
    00880 static void DrawTile_TunnelBridge(TileInfo *ti)
    00881 {
    00882   SpriteID image;
    00883   TransportType transport_type = GetTunnelBridgeTransportType(ti->tile);
    00884   DiagDirection tunnelbridge_direction = GetTunnelBridgeDirection(ti->tile);
    00885
    00886   if (IsTunnel(ti->tile)) {
    00887     /* Front view of tunnel bounding boxes:
    00888      *
    00889      *   122223  <- BB_Z_SEPARATOR
    00890      *   1    3
    00891      *   1    3                1,3 = empty helper BB
    00892      *   1    3                  2 = SpriteCombine of tunnel-roof and catenary (tram & elrail)
    00893      *
    00894      */
    00895
    00896     static const int _tunnel_BB[4][12] = {
    00897       /*  tunnnel-roof  |  Z-separator  | tram-catenary
    00898        * w  h  bb_x bb_y| x   y   w   h |bb_x bb_y w h */
    00899       {  1,  0, -15, -14,  0, 15, 16,  1, 0, 1, 16, 15 }, // NE
    00900       {  0,  1, -14, -15, 15,  0,  1, 16, 1, 0, 15, 16 }, // SE
    00901       {  1,  0, -15, -14,  0, 15, 16,  1, 0, 1, 16, 15 }, // SW
    00902       {  0,  1, -14, -15, 15,  0,  1, 16, 1, 0, 15, 16 }, // NW
    00903     };
    00904     const int *BB_data = _tunnel_BB[tunnelbridge_direction];
    00905
    00906     bool catenary = false;
    00907
    00908     if (transport_type == TRANSPORT_RAIL) {
    00909       image = GetRailTypeInfo(GetRailType(ti->tile))->base_sprites.tunnel;
    00910     } else {
    00911       image = SPR_TUNNEL_ENTRY_REAR_ROAD;
    00912     }
    00913
    00914     if (HasTunnelBridgeSnowOrDesert(ti->tile)) image += 32;
    00915
    00916     image += tunnelbridge_direction * 2;
    00917     DrawGroundSprite(image, PAL_NONE);
    00918
    00919     /* PBS debugging, draw reserved tracks darker */
    00920     if (_game_mode != GM_MENU && _settings_client.gui.show_track_reservation && (transport_type == TRANSPORT_RAIL && GetTunnelBridgeReservation(ti->tile))) {
    00921       const RailtypeInfo *rti = GetRailTypeInfo(GetRailType(ti->tile));
    00922       DrawGroundSprite(DiagDirToAxis(tunnelbridge_direction) == AXIS_X ? rti->base_sprites.single_y : rti->base_sprites.single_x, PALETTE_CRASH);
    00923     }
    00924
    00925     if (transport_type == TRANSPORT_ROAD) {
    00926       RoadTypes rts = GetRoadTypes(ti->tile);
    00927
    00928       if (HasBit(rts, ROADTYPE_TRAM)) {
    00929         static const SpriteID tunnel_sprites[2][4] = { { 28, 78, 79, 27 }, {  5, 76, 77,  4 } };
    00930
    00931         DrawGroundSprite(SPR_TRAMWAY_BASE + tunnel_sprites[rts - ROADTYPES_TRAM][tunnelbridge_direction], PAL_NONE);
    00932
    00933         /* Do not draw wires if they are invisible */
    00934         if (!IsInvisibilitySet(TO_CATENARY)) {
    00935           catenary = true;
    00936           StartSpriteCombine();
    00937           AddSortableSpriteToDraw(SPR_TRAMWAY_TUNNEL_WIRES + tunnelbridge_direction, PAL_NONE, ti->x, ti->y, BB_data[10], BB_data[11], TILE_HEIGHT, ti->z, IsTransparencySet(TO_CATENARY), BB_data[8], BB_data[9], BB_Z_SEPARATOR);
    00938         }
    00939       }
    00940     } else if (HasCatenaryDrawn(GetRailType(ti->tile))) {
    00941       /* Maybe draw pylons on the entry side */
    00942       DrawCatenary(ti);
    00943
    00944       catenary = true;
    00945       StartSpriteCombine();
    00946       /* Draw wire above the ramp */
    00947       DrawCatenaryOnTunnel(ti);
    00948     }
    00949
    00950     AddSortableSpriteToDraw(image + 1, PAL_NONE, ti->x + TILE_SIZE - 1, ti->y + TILE_SIZE - 1, BB_data[0], BB_data[1], TILE_HEIGHT, ti->z, false, BB_data[2], BB_data[3], BB_Z_SEPARATOR);
    00951
    00952     if (catenary) EndSpriteCombine();
    00953
    00954     /* Add helper BB for sprite sorting, that separate the tunnel from things beside of it */
    00955     AddSortableSpriteToDraw(SPR_EMPTY_BOUNDING_BOX, PAL_NONE, ti->x             , ti->y             , BB_data[6], BB_data[7], TILE_HEIGHT, ti->z);
    00956     AddSortableSpriteToDraw(SPR_EMPTY_BOUNDING_BOX, PAL_NONE, ti->x + BB_data[4], ti->y + BB_data[5], BB_data[6], BB_data[7], TILE_HEIGHT, ti->z);
    00957
    00958     DrawBridgeMiddle(ti);
    00959   } else { // IsBridge(ti->tile)
    00960     const PalSpriteID *psid;
    00961     int base_offset;
    00962     bool ice = HasTunnelBridgeSnowOrDesert(ti->tile);
    00963
    00964     if (transport_type == TRANSPORT_RAIL) {
    00965       base_offset = GetRailTypeInfo(GetRailType(ti->tile))->bridge_offset;
    00966       assert(base_offset != 8); // This one is used for roads
    00967     } else {
    00968       base_offset = 8;
    00969     }
    00970
    00971     /* as the lower 3 bits are used for other stuff, make sure they are clear */
    00972     assert( (base_offset & 0x07) == 0x00);
    00973
    00974     DrawFoundation(ti, GetBridgeFoundation(ti->tileh, DiagDirToAxis(tunnelbridge_direction)));
    00975
    00976     /* HACK Wizardry to convert the bridge ramp direction into a sprite offset */
    00977     base_offset += (6 - tunnelbridge_direction) % 4;
    00978
    00979     if (ti->tileh == SLOPE_FLAT) base_offset += 4; // sloped bridge head
    00980
    00981     /* Table number BRIDGE_PIECE_HEAD always refers to the bridge heads for any bridge type */
    00982     if (transport_type != TRANSPORT_WATER) {
    00983       psid = &GetBridgeSpriteTable(GetBridgeType(ti->tile), BRIDGE_PIECE_HEAD)[base_offset];
    00984     } else {
    00985       psid = _aqueduct_sprites + base_offset;
    00986     }
    00987
    00988     if (!ice) {
    00989       DrawClearLandTile(ti, 3);
    00990     } else {
    00991       DrawGroundSprite(SPR_FLAT_SNOWY_TILE + _tileh_to_sprite[ti->tileh], PAL_NONE);
    00992     }
    00993
    00994     /* draw ramp */
    00995
    00996     /* Draw Trambits and PBS Reservation as SpriteCombine */
    00997     if (transport_type == TRANSPORT_ROAD || transport_type == TRANSPORT_RAIL) StartSpriteCombine();
    00998
    00999     /* HACK set the height of the BB of a sloped ramp to 1 so a vehicle on
    01000      * it doesn't disappear behind it
    01001      */
    01002     /* Bridge heads are drawn solid no matter how invisibility/transparency is set */
    01003     AddSortableSpriteToDraw(psid->sprite, psid->pal, ti->x, ti->y, 16, 16, ti->tileh == SLOPE_FLAT ? 0 : 8, ti->z);
    01004
    01005     if (_game_mode != GM_MENU && _settings_client.gui.show_track_reservation && transport_type == TRANSPORT_RAIL && GetTunnelBridgeReservation(ti->tile)) {
    01006       const RailtypeInfo *rti = GetRailTypeInfo(GetRailType(ti->tile));
    01007       if (HasBridgeFlatRamp(ti->tileh, DiagDirToAxis(tunnelbridge_direction))) {
    01008         AddSortableSpriteToDraw(DiagDirToAxis(tunnelbridge_direction) == AXIS_X ? rti->base_sprites.single_y : rti->base_sprites.single_x, PALETTE_CRASH, ti->x, ti->y, 16, 16, 0, ti->z + 8);
    01009       } else {
    01010         AddSortableSpriteToDraw(rti->base_sprites.single_sloped + tunnelbridge_direction, PALETTE_CRASH, ti->x, ti->y, 16, 16, 8, ti->z);
    01011       }
    01012     }
    01013
    01014     if (transport_type == TRANSPORT_ROAD) {
    01015       RoadTypes rts = GetRoadTypes(ti->tile);
    01016
    01017       if (HasBit(rts, ROADTYPE_TRAM)) {
    01018         uint offset = tunnelbridge_direction;
    01019         uint z = ti->z;
    01020         if (ti->tileh != SLOPE_FLAT) {
    01021           offset = (offset + 1) & 1;
    01022           z += TILE_HEIGHT;
    01023         } else {
    01024           offset += 2;
    01025         }
    01026         /* DrawBridgeTramBits() calls EndSpriteCombine() and StartSpriteCombine() */
    01027         DrawBridgeTramBits(ti->x, ti->y, z, offset, HasBit(rts, ROADTYPE_ROAD), true);
    01028       }
    01029       EndSpriteCombine();
    01030     } else if (transport_type == TRANSPORT_RAIL) {
    01031       EndSpriteCombine();
    01032       if (HasCatenaryDrawn(GetRailType(ti->tile))) {
    01033         DrawCatenary(ti);
    01034       }
    01035     }
    01036
    01037     DrawBridgeMiddle(ti);
    01038   }
    01039 }
    01040
    01041
    01059 static BridgePieces CalcBridgePiece(uint north, uint south)
    01060 {
    01061   if (north == 1) {
    01062     return BRIDGE_PIECE_NORTH;
    01063   } else if (south == 1) {
    01064     return BRIDGE_PIECE_SOUTH;
    01065   } else if (north < south) {
    01066     return north & 1 ? BRIDGE_PIECE_INNER_SOUTH : BRIDGE_PIECE_INNER_NORTH;
    01067   } else if (north > south) {
    01068     return south & 1 ? BRIDGE_PIECE_INNER_NORTH : BRIDGE_PIECE_INNER_SOUTH;
    01069   } else {
    01070     return north & 1 ? BRIDGE_PIECE_MIDDLE_EVEN : BRIDGE_PIECE_MIDDLE_ODD;
    01071   }
    01072 }
    01073
    01074
    01075 void DrawBridgeMiddle(const TileInfo *ti)
    01076 {
    01077   /* Sectional view of bridge bounding boxes:
    01078    *
    01079    *  1           2                                1,2 = SpriteCombine of Bridge front/(back&floor) and TramCatenary
    01080    *  1           2                                  3 = empty helper BB
    01081    *  1     7     2                                4,5 = pillars under higher bridges
    01082    *  1 6 88888 6 2                                  6 = elrail-pylons
    01083    *  1 6 88888 6 2                                  7 = elrail-wire
    01084    *  1 6 88888 6 2  <- TILE_HEIGHT                  8 = rail-vehicle on bridge
    01085    *  3333333333333  <- BB_Z_SEPARATOR
    01086    *                 <- unused
    01087    *    4       5    <- BB_HEIGHT_UNDER_BRIDGE
    01088    *    4       5
    01089    *    4       5
    01090    *
    01091    */
    01092
    01093   /* Z position of the bridge sprites relative to bridge height (downwards) */
    01094   static const int BRIDGE_Z_START = 3;
    01095
    01096   if (!IsBridgeAbove(ti->tile)) return;
    01097
    01098   TileIndex rampnorth = GetNorthernBridgeEnd(ti->tile);
    01099   TileIndex rampsouth = GetSouthernBridgeEnd(ti->tile);
    01100   TransportType transport_type = GetTunnelBridgeTransportType(rampsouth);
    01101
    01102   Axis axis = GetBridgeAxis(ti->tile);
    01103   BridgePieces piece = CalcBridgePiece(
    01104     GetTunnelBridgeLength(ti->tile, rampnorth) + 1,
    01105     GetTunnelBridgeLength(ti->tile, rampsouth) + 1
    01106   );
    01107
    01108   const PalSpriteID *psid;
    01109   bool drawfarpillar;
    01110   if (transport_type != TRANSPORT_WATER) {
    01111     BridgeType type =  GetBridgeType(rampsouth);
    01112     drawfarpillar = !HasBit(GetBridgeSpec(type)->flags, 0);
    01113
    01114     uint base_offset;
    01115     if (transport_type == TRANSPORT_RAIL) {
    01116       base_offset = GetRailTypeInfo(GetRailType(rampsouth))->bridge_offset;
    01117     } else {
    01118       base_offset = 8;
    01119     }
    01120
    01121     psid = base_offset + GetBridgeSpriteTable(type, piece);
    01122   } else {
    01123     drawfarpillar = true;
    01124     psid = _aqueduct_sprites;
    01125   }
    01126
    01127   if (axis != AXIS_X) psid += 4;
    01128
    01129   int x = ti->x;
    01130   int y = ti->y;
    01131   uint bridge_z = GetBridgeHeight(rampsouth);
    01132   uint z = bridge_z - BRIDGE_Z_START;
    01133
    01134   /* Add a bounding box, that separates the bridge from things below it. */
    01135   AddSortableSpriteToDraw(SPR_EMPTY_BOUNDING_BOX, PAL_NONE, x, y, 16, 16, 1, bridge_z - TILE_HEIGHT + BB_Z_SEPARATOR);
    01136
    01137   /* Draw Trambits as SpriteCombine */
    01138   if (transport_type == TRANSPORT_ROAD) StartSpriteCombine();
    01139
    01140   /* Draw floor and far part of bridge*/
    01141   if (!IsInvisibilitySet(TO_BRIDGES)) {
    01142     if (axis == AXIS_X) {
    01143       AddSortableSpriteToDraw(psid->sprite, psid->pal, x, y, 16, 1, 0x28, z, IsTransparencySet(TO_BRIDGES), 0, 0, BRIDGE_Z_START);
    01144     } else {
    01145       AddSortableSpriteToDraw(psid->sprite, psid->pal, x, y, 1, 16, 0x28, z, IsTransparencySet(TO_BRIDGES), 0, 0, BRIDGE_Z_START);
    01146     }
    01147   }
    01148
    01149   psid++;
    01150
    01151   if (transport_type == TRANSPORT_ROAD) {
    01152     RoadTypes rts = GetRoadTypes(rampsouth);
    01153
    01154     if (HasBit(rts, ROADTYPE_TRAM)) {
    01155       /* DrawBridgeTramBits() calls EndSpriteCombine() and StartSpriteCombine() */
    01156       DrawBridgeTramBits(x, y, bridge_z, axis ^ 1, HasBit(rts, ROADTYPE_ROAD), false);
    01157     } else {
    01158       EndSpriteCombine();
    01159       StartSpriteCombine();
    01160     }
    01161   } else if (transport_type == TRANSPORT_RAIL) {
    01162     if (HasCatenaryDrawn(GetRailType(rampsouth))) {
    01163       DrawCatenaryOnBridge(ti);
    01164     }
    01165   }
    01166
    01167   /* draw roof, the component of the bridge which is logically between the vehicle and the camera */
    01168   if (!IsInvisibilitySet(TO_BRIDGES)) {
    01169     if (axis == AXIS_X) {
    01170       y += 12;
    01171       if (psid->sprite & SPRITE_MASK) AddSortableSpriteToDraw(psid->sprite, psid->pal, x, y, 16, 4, 0x28, z, IsTransparencySet(TO_BRIDGES), 0, 3, BRIDGE_Z_START);
    01172     } else {
    01173       x += 12;
    01174       if (psid->sprite & SPRITE_MASK) AddSortableSpriteToDraw(psid->sprite, psid->pal, x, y, 4, 16, 0x28, z, IsTransparencySet(TO_BRIDGES), 3, 0, BRIDGE_Z_START);
    01175     }
    01176   }
    01177
    01178   /* Draw TramFront as SpriteCombine */
    01179   if (transport_type == TRANSPORT_ROAD) EndSpriteCombine();
    01180
    01181   /* Do not draw anything more if bridges are invisible */
    01182   if (IsInvisibilitySet(TO_BRIDGES)) return;
    01183
    01184   psid++;
    01185   if (ti->z + 5 == z) {
    01186     /* draw poles below for small bridges */
    01187     if (psid->sprite != 0) {
    01188       SpriteID image = psid->sprite;
    01189       SpriteID pal   = psid->pal;
    01190       if (IsTransparencySet(TO_BRIDGES)) {
    01191         SetBit(image, PALETTE_MODIFIER_TRANSPARENT);
    01192         pal = PALETTE_TO_TRANSPARENT;
    01193       }
    01194
    01195       DrawGroundSpriteAt(image, pal, x, y, z);
    01196     }
    01197   } else if (_settings_client.gui.bridge_pillars) {
    01198     /* draw pillars below for high bridges */
    01199     DrawBridgePillars(psid, ti, axis, drawfarpillar, x, y, z);
    01200   }
    01201 }
    01202
    01203
    01204 static uint GetSlopeZ_TunnelBridge(TileIndex tile, uint x, uint y)
    01205 {
    01206   uint z;
    01207   Slope tileh = GetTileSlope(tile, &z);
    01208
    01209   x &= 0xF;
    01210   y &= 0xF;
    01211
    01212   if (IsTunnel(tile)) {
    01213     uint pos = (DiagDirToAxis(GetTunnelBridgeDirection(tile)) == AXIS_X ? y : x);
    01214
    01215     /* In the tunnel entrance? */
    01216     if (5 <= pos && pos <= 10) return z;
    01217   } else { // IsBridge(tile)
    01218     DiagDirection dir = GetTunnelBridgeDirection(tile);
    01219     uint pos = (DiagDirToAxis(dir) == AXIS_X ? y : x);
    01220
    01221     z += ApplyFoundationToSlope(GetBridgeFoundation(tileh, DiagDirToAxis(dir)), &tileh);
    01222
    01223     /* On the bridge ramp? */
    01224     if (5 <= pos && pos <= 10) {
    01225       uint delta;
    01226
    01227       if (tileh != SLOPE_FLAT) return z + TILE_HEIGHT;
    01228
    01229       switch (dir) {
    01230         default: NOT_REACHED();
    01231         case DIAGDIR_NE: delta = (TILE_SIZE - 1 - x) / 2; break;
    01232         case DIAGDIR_SE: delta = y / 2; break;
    01233         case DIAGDIR_SW: delta = x / 2; break;
    01234         case DIAGDIR_NW: delta = (TILE_SIZE - 1 - y) / 2; break;
    01235       }
    01236       return z + 1 + delta;
    01237     }
    01238   }
    01239
    01240   return z + GetPartialZ(x, y, tileh);
    01241 }
    01242
    01243 static Foundation GetFoundation_TunnelBridge(TileIndex tile, Slope tileh)
    01244 {
    01245   return IsTunnel(tile) ? FOUNDATION_NONE : GetBridgeFoundation(tileh, DiagDirToAxis(GetTunnelBridgeDirection(tile)));
    01246 }
    01247
    01248
    01249 static void GetAcceptedCargo_TunnelBridge(TileIndex tile, AcceptedCargo ac)
    01250 {
    01251   /* not used */
    01252 }
    01253
    01254 static void GetTileDesc_TunnelBridge(TileIndex tile, TileDesc *td)
    01255 {
    01256   TransportType tt = GetTunnelBridgeTransportType(tile);
    01257
    01258   if (IsTunnel(tile)) {
    01259     td->str = (tt == TRANSPORT_RAIL) ? STR_5017_RAILROAD_TUNNEL : STR_5018_ROAD_TUNNEL;
    01260   } else { // IsBridge(tile)
    01261     td->str = (tt == TRANSPORT_WATER) ? STR_AQUEDUCT : GetBridgeSpec(GetBridgeType(tile))->transport_name[tt];
    01262   }
    01263   td->owner[0] = GetTileOwner(tile);
    01264
    01265   Owner road_owner = INVALID_OWNER;
    01266   Owner tram_owner = INVALID_OWNER;
    01267   RoadTypes rts = GetRoadTypes(tile);
    01268   if (HasBit(rts, ROADTYPE_ROAD)) road_owner = GetRoadOwner(tile, ROADTYPE_ROAD);
    01269   if (HasBit(rts, ROADTYPE_TRAM)) tram_owner = GetRoadOwner(tile, ROADTYPE_TRAM);
    01270
    01271   /* Is there a mix of owners? */
    01272   if ((tram_owner != INVALID_OWNER && tram_owner != td->owner[0]) ||
    01273       (road_owner != INVALID_OWNER && road_owner != td->owner[0])) {
    01274     uint i = 1;
    01275     if (road_owner != INVALID_OWNER) {
    01276       td->owner_type[i] = STR_ROAD_OWNER;
    01277       td->owner[i] = road_owner;
    01278       i++;
    01279     }
    01280     if (tram_owner != INVALID_OWNER) {
    01281       td->owner_type[i] = STR_TRAM_OWNER;
    01282       td->owner[i] = tram_owner;
    01283     }
    01284   }
    01285 }
    01286
    01287
    01288 static void TileLoop_TunnelBridge(TileIndex tile)
    01289 {
    01290   bool snow_or_desert = HasTunnelBridgeSnowOrDesert(tile);
    01291   switch (_settings_game.game_creation.landscape) {
    01292     case LT_ARCTIC:
    01293       if (snow_or_desert != (GetTileZ(tile) > GetSnowLine())) {
    01294         SetTunnelBridgeSnowOrDesert(tile, !snow_or_desert);
    01295         MarkTileDirtyByTile(tile);
    01296       }
    01297       break;
    01298
    01299     case LT_TROPIC:
    01300       if (GetTropicZone(tile) == TROPICZONE_DESERT && !snow_or_desert) {
    01301         SetTunnelBridgeSnowOrDesert(tile, true);
    01302         MarkTileDirtyByTile(tile);
    01303       }
    01304       break;
    01305
    01306     default:
    01307       break;
    01308   }
    01309 }
    01310
    01311 static TrackStatus GetTileTrackStatus_TunnelBridge(TileIndex tile, TransportType mode, uint sub_mode, DiagDirection side)
    01312 {
    01313   TransportType transport_type = GetTunnelBridgeTransportType(tile);
    01314   if (transport_type != mode || (transport_type == TRANSPORT_ROAD && (GetRoadTypes(tile) & sub_mode) == 0)) return 0;
    01315
    01316   DiagDirection dir = GetTunnelBridgeDirection(tile);
    01317   if (side != INVALID_DIAGDIR && side != ReverseDiagDir(dir)) return 0;
    01318   return CombineTrackStatus(TrackBitsToTrackdirBits(DiagDirToDiagTrackBits(dir)), TRACKDIR_BIT_NONE);
    01319 }
    01320
    01321 static void ChangeTileOwner_TunnelBridge(TileIndex tile, Owner old_owner, Owner new_owner)
    01322 {
    01323   for (RoadType rt = ROADTYPE_ROAD; rt < ROADTYPE_END; rt++) {
    01324     /* Update all roadtypes, no matter if they are present */
    01325     if (GetRoadOwner(tile, rt) == old_owner) {
    01326       SetRoadOwner(tile, rt, new_owner == INVALID_OWNER ? OWNER_NONE : new_owner);
    01327     }
    01328   }
    01329
    01330   if (!IsTileOwner(tile, old_owner)) return;
    01331
    01332   if (new_owner != INVALID_OWNER) {
    01333     SetTileOwner(tile, new_owner);
    01334   } else {
    01335     if (CmdFailed(DoCommand(tile, 0, 0, DC_EXEC | DC_BANKRUPT, CMD_LANDSCAPE_CLEAR))) {
    01336       /* When clearing the bridge/tunnel failed there are still vehicles on/in
    01337        * the bridge/tunnel. As all *our* vehicles are already removed, they
    01338        * must be of another owner. Therefore this can't be rail tunnel/bridge.
    01339        * In that case we can safely reassign the ownership to OWNER_NONE. */
    01340       assert(GetTunnelBridgeTransportType(tile) != TRANSPORT_RAIL);
    01341       SetTileOwner(tile, OWNER_NONE);
    01342     }
    01343   }
    01344 }
    01345
    01346
    01347 static const byte _tunnel_fractcoord_1[4]    = {0x8E, 0x18, 0x81, 0xE8};
    01348 static const byte _tunnel_fractcoord_2[4]    = {0x81, 0x98, 0x87, 0x38};
    01349 static const byte _tunnel_fractcoord_3[4]    = {0x82, 0x88, 0x86, 0x48};
    01350 static const byte _exit_tunnel_track[4]      = {1, 2, 1, 2};
    01351
    01353 static const Trackdir _road_exit_tunnel_state[DIAGDIR_END] = {
    01354   TRACKDIR_X_SW, TRACKDIR_Y_NW, TRACKDIR_X_NE, TRACKDIR_Y_SE
    01355 };
    01356 static const byte _road_exit_tunnel_frame[4] = {2, 7, 9, 4};
    01357
    01358 static const byte _tunnel_fractcoord_4[4]    = {0x52, 0x85, 0x98, 0x29};
    01359 static const byte _tunnel_fractcoord_5[4]    = {0x92, 0x89, 0x58, 0x25};
    01360 static const byte _tunnel_fractcoord_6[4]    = {0x92, 0x89, 0x56, 0x45};
    01361 static const byte _tunnel_fractcoord_7[4]    = {0x52, 0x85, 0x96, 0x49};
    01362
    01363 static VehicleEnterTileStatus VehicleEnter_TunnelBridge(Vehicle *v, TileIndex tile, int x, int y)
    01364 {
    01365   int z = GetSlopeZ(x, y) - v->z_pos;
    01366
    01367   if (abs(z) > 2) return VETSB_CANNOT_ENTER;
    01368   const DiagDirection dir = GetTunnelBridgeDirection(tile);
    01369
    01370   if (IsTunnel(tile)) {
    01371     byte fc;
    01372     DiagDirection vdir;
    01373
    01374     if (v->type == VEH_TRAIN) {
    01375       fc = (x & 0xF) + (y << 4);
    01376
    01377       vdir = DirToDiagDir(v->direction);
    01378
    01379       if (v->u.rail.track != TRACK_BIT_WORMHOLE && dir == vdir) {
    01380         if (IsFrontEngine(v) && fc == _tunnel_fractcoord_1[dir]) {
    01381           if (!PlayVehicleSound(v, VSE_TUNNEL) && RailVehInfo(v->engine_type)->engclass == 0) {
    01382             SndPlayVehicleFx(SND_05_TRAIN_THROUGH_TUNNEL, v);
    01383           }
    01384           return VETSB_CONTINUE;
    01385         }
    01386         if (fc == _tunnel_fractcoord_2[dir]) {
    01387           v->tile = tile;
    01388           v->u.rail.track = TRACK_BIT_WORMHOLE;
    01389           v->vehstatus |= VS_HIDDEN;
    01390           return VETSB_ENTERED_WORMHOLE;
    01391         }
    01392       }
    01393
    01394       if (dir == ReverseDiagDir(vdir) && fc == _tunnel_fractcoord_3[dir] && z == 0) {
    01395         /* We're at the tunnel exit ?? */
    01396         v->tile = tile;
    01397         v->u.rail.track = (TrackBits)_exit_tunnel_track[dir];
    01398         assert(v->u.rail.track);
    01399         v->vehstatus &= ~VS_HIDDEN;
    01400         return VETSB_ENTERED_WORMHOLE;
    01401       }
    01402     } else if (v->type == VEH_ROAD) {
    01403       fc = (x & 0xF) + (y << 4);
    01404       vdir = DirToDiagDir(v->direction);
    01405
    01406       /* Enter tunnel? */
    01407       if (v->u.road.state != RVSB_WORMHOLE && dir == vdir) {
    01408         if (fc == _tunnel_fractcoord_4[dir] ||
    01409             fc == _tunnel_fractcoord_5[dir]) {
    01410           v->tile = tile;
    01411           v->u.road.state = RVSB_WORMHOLE;
    01412           v->vehstatus |= VS_HIDDEN;
    01413           return VETSB_ENTERED_WORMHOLE;
    01414         } else {
    01415           return VETSB_CONTINUE;
    01416         }
    01417       }
    01418
    01419       if (dir == ReverseDiagDir(vdir) && (
    01420             /* We're at the tunnel exit ?? */
    01421             fc == _tunnel_fractcoord_6[dir] ||
    01422             fc == _tunnel_fractcoord_7[dir]
    01423           ) &&
    01424           z == 0) {
    01425         v->tile = tile;
    01426         v->u.road.state = _road_exit_tunnel_state[dir];
    01427         v->u.road.frame = _road_exit_tunnel_frame[dir];
    01428         v->vehstatus &= ~VS_HIDDEN;
    01429         return VETSB_ENTERED_WORMHOLE;
    01430       }
    01431     }
    01432   } else { // IsBridge(tile)
    01433
    01434     if (v->IsPrimaryVehicle() && v->type != VEH_SHIP) {
    01435       /* modify speed of vehicle */
    01436       uint16 spd = GetBridgeSpec(GetBridgeType(tile))->speed;
    01437
    01438       if (v->type == VEH_ROAD) spd *= 2;
    01439       if (v->cur_speed > spd) v->cur_speed = spd;
    01440     }
    01441
    01442     if (DirToDiagDir(v->direction) == dir) {
    01443       switch (dir) {
    01444         default: NOT_REACHED();
    01445         case DIAGDIR_NE: if ((x & 0xF) != 0)             return VETSB_CONTINUE; break;
    01446         case DIAGDIR_SE: if ((y & 0xF) != TILE_SIZE - 1) return VETSB_CONTINUE; break;
    01447         case DIAGDIR_SW: if ((x & 0xF) != TILE_SIZE - 1) return VETSB_CONTINUE; break;
    01448         case DIAGDIR_NW: if ((y & 0xF) != 0)             return VETSB_CONTINUE; break;
    01449       }
    01450       switch (v->type) {
    01451         case VEH_TRAIN:
    01452           v->u.rail.track = TRACK_BIT_WORMHOLE;
    01453           ClrBit(v->u.rail.flags, VRF_GOINGUP);
    01454           ClrBit(v->u.rail.flags, VRF_GOINGDOWN);
    01455           break;
    01456
    01457         case VEH_ROAD:
    01458           v->u.road.state = RVSB_WORMHOLE;
    01459           break;
    01460
    01461         case VEH_SHIP:
    01462           v->u.ship.state = TRACK_BIT_WORMHOLE;
    01463           break;
    01464
    01465         default: NOT_REACHED();
    01466       }
    01467       return VETSB_ENTERED_WORMHOLE;
    01468     } else if (DirToDiagDir(v->direction) == ReverseDiagDir(dir)) {
    01469       v->tile = tile;
    01470       switch (v->type) {
    01471         case VEH_TRAIN:
    01472           if (v->u.rail.track == TRACK_BIT_WORMHOLE) {
    01473             v->u.rail.track = (DiagDirToAxis(dir) == AXIS_X ? TRACK_BIT_X : TRACK_BIT_Y);
    01474             return VETSB_ENTERED_WORMHOLE;
    01475           }
    01476           break;
    01477
    01478         case VEH_ROAD:
    01479           if (v->u.road.state == RVSB_WORMHOLE) {
    01480             v->u.road.state = _road_exit_tunnel_state[dir];
    01481             v->u.road.frame = 0;
    01482             return VETSB_ENTERED_WORMHOLE;
    01483           }
    01484           break;
    01485
    01486         case VEH_SHIP:
    01487           if (v->u.ship.state == TRACK_BIT_WORMHOLE) {
    01488             v->u.ship.state = (DiagDirToAxis(dir) == AXIS_X ? TRACK_BIT_X : TRACK_BIT_Y);
    01489             return VETSB_ENTERED_WORMHOLE;
    01490           }
    01491           break;
    01492
    01493         default: NOT_REACHED();
    01494       }
    01495     }
    01496   }
    01497   return VETSB_CONTINUE;
    01498 }
    01499
    01500 static CommandCost TerraformTile_TunnelBridge(TileIndex tile, DoCommandFlag flags, uint z_new, Slope tileh_new)
    01501 {
    01502   if (_settings_game.construction.build_on_slopes && AutoslopeEnabled() && IsBridge(tile) && GetTunnelBridgeTransportType(tile) != TRANSPORT_WATER) {
    01503     DiagDirection direction = GetTunnelBridgeDirection(tile);
    01504     Axis axis = DiagDirToAxis(direction);
    01505     CommandCost res;
    01506     uint z_old;
    01507     Slope tileh_old = GetTileSlope(tile, &z_old);
    01508
    01509     /* Check if new slope is valid for bridges in general (so we can safely call GetBridgeFoundation()) */
    01510     if ((direction == DIAGDIR_NW) || (direction == DIAGDIR_NE)) {
    01511       CheckBridgeSlopeSouth(axis, &tileh_old, &z_old);
    01512       res = CheckBridgeSlopeSouth(axis, &tileh_new, &z_new);
    01513     } else {
    01514       CheckBridgeSlopeNorth(axis, &tileh_old, &z_old);
    01515       res = CheckBridgeSlopeNorth(axis, &tileh_new, &z_new);
    01516     }
    01517
    01518     /* Surface slope is valid and remains unchanged? */
    01519     if (!CmdFailed(res) && (z_old == z_new) && (tileh_old == tileh_new)) return CommandCost(EXPENSES_CONSTRUCTION, _price.terraform);
    01520   }
    01521
    01522   return DoCommand(tile, 0, 0, flags, CMD_LANDSCAPE_CLEAR);
    01523 }
    01524
    01525 extern const TileTypeProcs _tile_type_tunnelbridge_procs = {
    01526   DrawTile_TunnelBridge,           // draw_tile_proc
    01527   GetSlopeZ_TunnelBridge,          // get_slope_z_proc
    01528   ClearTile_TunnelBridge,          // clear_tile_proc
    01529   GetAcceptedCargo_TunnelBridge,   // get_accepted_cargo_proc
    01530   GetTileDesc_TunnelBridge,        // get_tile_desc_proc
    01531   GetTileTrackStatus_TunnelBridge, // get_tile_track_status_proc
    01532   NULL,                            // click_tile_proc
    01533   NULL,                            // animate_tile_proc
    01534   TileLoop_TunnelBridge,           // tile_loop_clear
    01535   ChangeTileOwner_TunnelBridge,    // change_tile_owner_clear
    01536   NULL,                            // get_produced_cargo_proc
    01537   VehicleEnter_TunnelBridge,       // vehicle_enter_tile_proc
    01538   GetFoundation_TunnelBridge,      // get_foundation_proc
    01539   TerraformTile_TunnelBridge,      // terraform_tile_proc
    01540 };