# tunnelbridge_cmd.cpp

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    00001 /* $Id: tunnelbridge_cmd.cpp 18477 2009-12-13 00:24:53Z 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   } else {
    00252     if (bridge_len > (_settings_game.construction.longbridges ? 100U : 16U)) return_cmd_error(STR_5015_CAN_T_BUILD_BRIDGE_HERE);
    00253   }
    00254
    00255   /* retrieve landscape height and ensure it's on land */
    00256   tile_start = TileXY(x, y);
    00257   tile_end = TileXY(sx, sy);
    00258   if (IsWaterTile(tile_start) || IsWaterTile(tile_end)) {
    00259     return_cmd_error(STR_02A0_ENDS_OF_BRIDGE_MUST_BOTH);
    00260   }
    00261
    00262   tileh_start = GetTileSlope(tile_start, &z_start);
    00263   tileh_end = GetTileSlope(tile_end, &z_end);
    00264
    00265   CommandCost terraform_cost_north = CheckBridgeSlopeNorth(direction, &tileh_start, &z_start);
    00266   CommandCost terraform_cost_south = CheckBridgeSlopeSouth(direction, &tileh_end,   &z_end);
    00267
    00268   if (z_start != z_end) return_cmd_error(STR_BRIDGEHEADS_NOT_SAME_HEIGHT);
    00269
    00270   if (IsBridgeTile(tile_start) && IsBridgeTile(tile_end) &&
    00271       GetOtherBridgeEnd(tile_start) == tile_end &&
    00272       GetTunnelBridgeTransportType(tile_start) == transport_type) {
    00273     /* Replace a current bridge. */
    00274
    00275     /* If this is a railway bridge, make sure the railtypes match. */
    00276     if (transport_type == TRANSPORT_RAIL && GetRailType(tile_start) != railtype) {
    00277       return_cmd_error(STR_5007_MUST_DEMOLISH_BRIDGE_FIRST);
    00278     }
    00279
    00280     /* Do not replace town bridges with lower speed bridges. */
    00281     if (!(flags & DC_QUERY_COST) && IsTileOwner(tile_start, OWNER_TOWN) &&
    00282         GetBridgeSpec(bridge_type)->speed < GetBridgeSpec(GetBridgeType(tile_start))->speed) {
    00283       Town *t = ClosestTownFromTile(tile_start, UINT_MAX);
    00284
    00285       if (t == NULL) {
    00286         return CMD_ERROR;
    00287       } else {
    00288         SetDParam(0, t->index);
    00289         return_cmd_error(STR_2009_LOCAL_AUTHORITY_REFUSES);
    00290       }
    00291     }
    00292
    00293     /* Do not replace the bridge with the same bridge type. */
    00294     if (!(flags & DC_QUERY_COST) && bridge_type == GetBridgeType(tile_start)) {
    00295       return_cmd_error(STR_1007_ALREADY_BUILT);
    00296     }
    00297
    00298     /* Do not allow replacing another company's bridges. */
    00299     if (!IsTileOwner(tile_start, _current_company) && !IsTileOwner(tile_start, OWNER_TOWN)) {
    00300       return_cmd_error(STR_1024_AREA_IS_OWNED_BY_ANOTHER);
    00301     }
    00302
    00303     cost.AddCost((bridge_len + 1) * _price.clear_bridge); // The cost of clearing the current bridge.
    00304     replace_bridge = true;
    00305     replaced_bridge_type = GetBridgeType(tile_start);
    00306
    00307     /* Do not remove road types when upgrading a bridge */
    00308     roadtypes |= GetRoadTypes(tile_start);
    00309   } else {
    00310     /* Build a new bridge. */
    00311
    00312     bool allow_on_slopes = (_settings_game.construction.build_on_slopes && transport_type != TRANSPORT_WATER);
    00313
    00314     /* Try and clear the start landscape */
    00315     ret = DoCommand(tile_start, 0, 0, flags, CMD_LANDSCAPE_CLEAR);
    00316     if (CmdFailed(ret)) return ret;
    00317     cost = ret;
    00318
    00319     if (CmdFailed(terraform_cost_north) || (terraform_cost_north.GetCost() != 0 && !allow_on_slopes))
    00320       return_cmd_error(STR_1000_LAND_SLOPED_IN_WRONG_DIRECTION);
    00321     cost.AddCost(terraform_cost_north);
    00322
    00323     /* Try and clear the end landscape */
    00324     ret = DoCommand(tile_end, 0, 0, flags, CMD_LANDSCAPE_CLEAR);
    00325     if (CmdFailed(ret)) return ret;
    00326     cost.AddCost(ret);
    00327
    00328     /* false - end tile slope check */
    00329     if (CmdFailed(terraform_cost_south) || (terraform_cost_south.GetCost() != 0 && !allow_on_slopes))
    00330       return_cmd_error(STR_1000_LAND_SLOPED_IN_WRONG_DIRECTION);
    00331     cost.AddCost(terraform_cost_south);
    00332
    00333     if (transport_type == TRANSPORT_WATER && (tileh_start == SLOPE_FLAT || tileh_end == SLOPE_FLAT)) return_cmd_error(STR_1000_LAND_SLOPED_IN_WRONG_DIRECTION);
    00334   }
    00335
    00336   if (!replace_bridge) {
    00337     TileIndex Heads[] = {tile_start, tile_end};
    00338     int i;
    00339
    00340     for (i = 0; i < 2; i++) {
    00341       if (MayHaveBridgeAbove(Heads[i])) {
    00342         if (IsBridgeAbove(Heads[i])) {
    00343           TileIndex north_head = GetNorthernBridgeEnd(Heads[i]);
    00344
    00345           if (direction == GetBridgeAxis(Heads[i])) return_cmd_error(STR_5007_MUST_DEMOLISH_BRIDGE_FIRST);
    00346
    00347           if (z_start + TILE_HEIGHT == GetBridgeHeight(north_head)) {
    00348             return_cmd_error(STR_5007_MUST_DEMOLISH_BRIDGE_FIRST);
    00349           }
    00350         }
    00351       }
    00352     }
    00353   }
    00354
    00355   /* do the drill? */
    00356   if (flags & DC_EXEC) {
    00357     DiagDirection dir = AxisToDiagDir(direction);
    00358     Owner owner = replace_bridge ? GetTileOwner(tile_start) : _current_company;
    00359
    00360     switch (transport_type) {
    00361       case TRANSPORT_RAIL:
    00362         MakeRailBridgeRamp(tile_start, owner, bridge_type, dir,                 railtype);
    00363         MakeRailBridgeRamp(tile_end,   owner, bridge_type, ReverseDiagDir(dir), railtype);
    00364         break;
    00365
    00366       case TRANSPORT_ROAD:
    00367         MakeRoadBridgeRamp(tile_start, owner, bridge_type, dir,                 roadtypes);
    00368         MakeRoadBridgeRamp(tile_end,   owner, bridge_type, ReverseDiagDir(dir), roadtypes);
    00369         break;
    00370
    00371       case TRANSPORT_WATER:
    00372         MakeAqueductBridgeRamp(tile_start, owner, dir);
    00373         MakeAqueductBridgeRamp(tile_end,   owner, ReverseDiagDir(dir));
    00374         break;
    00375
    00376       default:
    00377         NOT_REACHED();
    00378         break;
    00379     }
    00380     MarkTileDirtyByTile(tile_start);
    00381     MarkTileDirtyByTile(tile_end);
    00382   }
    00383
    00384   delta = (direction == AXIS_X ? TileDiffXY(1, 0) : TileDiffXY(0, 1));
    00385   for (tile = tile_start + delta; tile != tile_end; tile += delta) {
    00386     if (GetTileMaxZ(tile) > z_start) return_cmd_error(STR_BRIDGE_TOO_LOW_FOR_TERRAIN);
    00387
    00388     if (MayHaveBridgeAbove(tile) && IsBridgeAbove(tile) && !replace_bridge) {
    00389       /* Disallow crossing bridges for the time being */
    00390       return_cmd_error(STR_5007_MUST_DEMOLISH_BRIDGE_FIRST);
    00391     }
    00392
    00393     switch (GetTileType(tile)) {
    00394       case MP_WATER:
    00395         if (!IsWater(tile) && !IsCoast(tile)) goto not_valid_below;
    00396         break;
    00397
    00398       case MP_RAILWAY:
    00399         if (!IsPlainRail(tile)) goto not_valid_below;
    00400         break;
    00401
    00402       case MP_ROAD:
    00403         if (IsRoadDepot(tile)) goto not_valid_below;
    00404         break;
    00405
    00406       case MP_TUNNELBRIDGE:
    00407         if (IsTunnel(tile)) break;
    00408         if (replace_bridge) break;
    00409         if (direction == DiagDirToAxis(GetTunnelBridgeDirection(tile))) goto not_valid_below;
    00410         if (z_start < GetBridgeHeight(tile)) goto not_valid_below;
    00411         break;
    00412
    00413       case MP_UNMOVABLE:
    00414         if (!IsOwnedLand(tile)) goto not_valid_below;
    00415         break;
    00416
    00417       case MP_CLEAR:
    00418         break;
    00419
    00420       default:
    00421 not_valid_below:;
    00422         /* try and clear the middle landscape */
    00423         ret = DoCommand(tile, 0, 0, flags, CMD_LANDSCAPE_CLEAR);
    00424         if (CmdFailed(ret)) return ret;
    00425         cost.AddCost(ret);
    00426         break;
    00427     }
    00428
    00429     if (flags & DC_EXEC) {
    00430       SetBridgeMiddle(tile, direction);
    00431       MarkTileDirtyByTile(tile);
    00432     }
    00433   }
    00434
    00435   if (flags & DC_EXEC && transport_type == TRANSPORT_RAIL) {
    00436     Track track = AxisToTrack(direction);
    00437     AddSideToSignalBuffer(tile_start, INVALID_DIAGDIR, _current_company);
    00438     YapfNotifyTrackLayoutChange(tile_start, track);
    00439   }
    00440
    00441   /* for human player that builds the bridge he gets a selection to choose from bridges (DC_QUERY_COST)
    00442    * It's unnecessary to execute this command every time for every bridge. So it is done only
    00443    * and cost is computed in "bridge_gui.c". For AI, Towns this has to be of course calculated
    00444    */
    00445   if (!(flags & DC_QUERY_COST) || (IsValidCompanyID(_current_company) && GetCompany(_current_company)->is_ai)) {
    00446     bridge_len += 2; // begin and end tiles/ramps
    00447
    00448     if (IsValidCompanyID(_current_company))
    00449       bridge_len = CalcBridgeLenCostFactor(bridge_len);
    00450
    00451     cost.AddCost((int64)bridge_len * _price.build_bridge * GetBridgeSpec(bridge_type)->price >> 8);
    00452
    00453     /* Aqueducts are a little more expensive. */
    00454     if (transport_type == TRANSPORT_WATER) cost.AddCost((int64)bridge_len * _price.clear_water);
    00455   }
    00456
    00457   return cost;
    00458 }
    00459
    00460
    00467 CommandCost CmdBuildTunnel(TileIndex start_tile, DoCommandFlag flags, uint32 p1, uint32 p2, const char *text)
    00468 {
    00469   TileIndexDiff delta;
    00470   TileIndex end_tile;
    00471   DiagDirection direction;
    00472   Slope start_tileh;
    00473   Slope end_tileh;
    00474   TransportType transport_type = (TransportType)GB(p1, 9, 1);
    00475   uint start_z;
    00476   uint end_z;
    00477   CommandCost cost(EXPENSES_CONSTRUCTION);
    00478   CommandCost ret;
    00479
    00480   _build_tunnel_endtile = 0;
    00481   if (transport_type == TRANSPORT_RAIL) {
    00482     if (!ValParamRailtype((RailType)p1)) return CMD_ERROR;
    00483   } else {
    00484     const RoadTypes rts = (RoadTypes)GB(p1, 0, 2);
    00485     if (!AreValidRoadTypes(rts) || !HasRoadTypesAvail(_current_company, rts)) return CMD_ERROR;
    00486   }
    00487
    00488   start_tileh = GetTileSlope(start_tile, &start_z);
    00489   direction = GetInclinedSlopeDirection(start_tileh);
    00490   if (direction == INVALID_DIAGDIR) return_cmd_error(STR_500B_SITE_UNSUITABLE_FOR_TUNNEL);
    00491
    00492   if (IsWaterTile(start_tile)) return_cmd_error(STR_3807_CAN_T_BUILD_ON_WATER);
    00493
    00494   ret = DoCommand(start_tile, 0, 0, flags, CMD_LANDSCAPE_CLEAR);
    00495   if (CmdFailed(ret)) return ret;
    00496
    00497   /* XXX - do NOT change 'ret' in the loop, as it is used as the price
    00498    * for the clearing of the entrance of the tunnel. Assigning it to
    00499    * cost before the loop will yield different costs depending on start-
    00500    * position, because of increased-cost-by-length: 'cost += cost >> 3' */
    00501
    00502   delta = TileOffsByDiagDir(direction);
    00503   DiagDirection tunnel_in_way_dir;
    00504   if (DiagDirToAxis(direction) == AXIS_Y) {
    00505     tunnel_in_way_dir = (TileX(start_tile) < (MapMaxX() / 2)) ? DIAGDIR_SW : DIAGDIR_NE;
    00506   } else {
    00507     tunnel_in_way_dir = (TileY(start_tile) < (MapMaxX() / 2)) ? DIAGDIR_SE : DIAGDIR_NW;
    00508   }
    00509
    00510   end_tile = start_tile;
    00511
    00513   int tiles_coef = 3;
    00515   int tiles = 0;
    00517   int tiles_bump = 25;
    00518
    00519   for (;;) {
    00520     end_tile += delta;
    00521     if (!IsValidTile(end_tile)) return_cmd_error(STR_TUNNEL_THROUGH_MAP_BORDER);
    00522     end_tileh = GetTileSlope(end_tile, &end_z);
    00523
    00524     if (start_z == end_z) break;
    00525
    00526     if (!_cheats.crossing_tunnels.value && IsTunnelInWayDir(end_tile, start_z, tunnel_in_way_dir)) {
    00527       return_cmd_error(STR_5003_ANOTHER_TUNNEL_IN_THE_WAY);
    00528     }
    00529
    00530     tiles++;
    00531     if (tiles == tiles_bump) {
    00532       tiles_coef++;
    00533       tiles_bump *= 2;
    00534     }
    00535
    00536     cost.AddCost(_price.build_tunnel);
    00537     cost.AddCost(cost.GetCost() >> tiles_coef); // add a multiplier for longer tunnels
    00538   }
    00539
    00540   /* Add the cost of the entrance */
    00541   cost.AddCost(_price.build_tunnel);
    00542   cost.AddCost(ret);
    00543
    00544   /* if the command fails from here on we want the end tile to be highlighted */
    00545   _build_tunnel_endtile = end_tile;
    00546
    00547   if (IsWaterTile(end_tile)) return_cmd_error(STR_3807_CAN_T_BUILD_ON_WATER);
    00548
    00549   /* slope of end tile must be complementary to the slope of the start tile */
    00550   if (end_tileh != ComplementSlope(start_tileh)) {
    00551     /* Check if there is a structure on the terraformed tile. Do not add the cost, that will be done by the terraforming
    00552      * Note: Currently the town rating is also affected by this clearing-test. So effectivly the player is punished twice for clearing
    00553      *       the tree on end_tile.
    00554      */
    00555     ret = DoCommand(end_tile, 0, 0, DC_AUTO, CMD_LANDSCAPE_CLEAR);
    00556     if (CmdFailed(ret)) return_cmd_error(STR_5005_UNABLE_TO_EXCAVATE_LAND);
    00557
    00558     ret = DoCommand(end_tile, end_tileh & start_tileh, 0, flags, CMD_TERRAFORM_LAND);
    00559     if (CmdFailed(ret)) return_cmd_error(STR_5005_UNABLE_TO_EXCAVATE_LAND);
    00560   } else {
    00561     ret = DoCommand(end_tile, 0, 0, flags, CMD_LANDSCAPE_CLEAR);
    00562     if (CmdFailed(ret)) return ret;
    00563   }
    00564   cost.AddCost(_price.build_tunnel);
    00565   cost.AddCost(ret);
    00566
    00567   if (flags & DC_EXEC) {
    00568     if (transport_type == TRANSPORT_RAIL) {
    00569       MakeRailTunnel(start_tile, _current_company, direction,                 (RailType)GB(p1, 0, 4));
    00570       MakeRailTunnel(end_tile,   _current_company, ReverseDiagDir(direction), (RailType)GB(p1, 0, 4));
    00571       AddSideToSignalBuffer(start_tile, INVALID_DIAGDIR, _current_company);
    00572       YapfNotifyTrackLayoutChange(start_tile, DiagDirToDiagTrack(direction));
    00573     } else {
    00574       MakeRoadTunnel(start_tile, _current_company, direction,                 (RoadTypes)GB(p1, 0, 2));
    00575       MakeRoadTunnel(end_tile,   _current_company, ReverseDiagDir(direction), (RoadTypes)GB(p1, 0, 2));
    00576     }
    00577   }
    00578
    00579   return cost;
    00580 }
    00581
    00582
    00583 static inline bool CheckAllowRemoveTunnelBridge(TileIndex tile)
    00584 {
    00585   /* Floods can remove anything as well as the scenario editor */
    00586   if (_current_company == OWNER_WATER || _game_mode == GM_EDITOR) return true;
    00587
    00588   switch (GetTunnelBridgeTransportType(tile)) {
    00589     case TRANSPORT_ROAD: {
    00590       RoadTypes rts = GetRoadTypes(tile);
    00591       Owner road_owner = _current_company;
    00592       Owner tram_owner = _current_company;
    00593
    00594       if (HasBit(rts, ROADTYPE_ROAD)) road_owner = GetRoadOwner(tile, ROADTYPE_ROAD);
    00595       if (HasBit(rts, ROADTYPE_TRAM)) tram_owner = GetRoadOwner(tile, ROADTYPE_TRAM);
    00596
    00597       /* We can remove unowned road and if the town allows it */
    00598       if (road_owner == OWNER_TOWN && !(_settings_game.construction.extra_dynamite || _cheats.magic_bulldozer.value)) return CheckTileOwnership(tile);
    00599       if (road_owner == OWNER_NONE || road_owner == OWNER_TOWN) road_owner = _current_company;
    00600       if (tram_owner == OWNER_NONE) tram_owner = _current_company;
    00601
    00602       return CheckOwnership(road_owner) && CheckOwnership(tram_owner);
    00603     }
    00604
    00605     case TRANSPORT_RAIL:
    00606     case TRANSPORT_WATER:
    00607       return CheckOwnership(GetTileOwner(tile));
    00608
    00609     default: NOT_REACHED();
    00610   }
    00611 }
    00612
    00613 static CommandCost DoClearTunnel(TileIndex tile, DoCommandFlag flags)
    00614 {
    00615   Town *t = NULL;
    00616   TileIndex endtile;
    00617
    00618   if (!CheckAllowRemoveTunnelBridge(tile)) return CMD_ERROR;
    00619
    00620   endtile = GetOtherTunnelEnd(tile);
    00621
    00622   if (HasVehicleOnTunnelBridge(tile, endtile)) return CMD_ERROR;
    00623
    00624   _build_tunnel_endtile = endtile;
    00625
    00626   if (IsTileOwner(tile, OWNER_TOWN) && _game_mode != GM_EDITOR) {
    00627     t = ClosestTownFromTile(tile, UINT_MAX); // town penalty rating
    00628
    00629     /* Check if you are allowed to remove the tunnel owned by a town
    00630      * Removal depends on difficulty settings */
    00631     if (!CheckforTownRating(flags, t, TUNNELBRIDGE_REMOVE)) {
    00632       SetDParam(0, t->index);
    00633       return_cmd_error(STR_2009_LOCAL_AUTHORITY_REFUSES);
    00634     }
    00635   }
    00636
    00637   /* checks if the owner is town then decrease town rating by RATING_TUNNEL_BRIDGE_DOWN_STEP until
    00638    * you have a "Poor" (0) town rating */
    00639   if (IsTileOwner(tile, OWNER_TOWN) && _game_mode != GM_EDITOR) {
    00640     ChangeTownRating(t, RATING_TUNNEL_BRIDGE_DOWN_STEP, RATING_TUNNEL_BRIDGE_MINIMUM, flags);
    00641   }
    00642
    00643   if (flags & DC_EXEC) {
    00644     if (GetTunnelBridgeTransportType(tile) == TRANSPORT_RAIL) {
    00645       /* We first need to request values before calling DoClearSquare */
    00646       DiagDirection dir = GetTunnelBridgeDirection(tile);
    00647       Track track = DiagDirToDiagTrack(dir);
    00648       Owner owner = GetTileOwner(tile);
    00649
    00650       Vehicle *v = NULL;
    00651       if (GetTunnelBridgeReservation(tile)) {
    00652         v = GetTrainForReservation(tile, track);
    00653         if (v != NULL) FreeTrainTrackReservation(v);
    00654       }
    00655
    00656       DoClearSquare(tile);
    00657       DoClearSquare(endtile);
    00658
    00659       /* cannot use INVALID_DIAGDIR for signal update because the tunnel doesn't exist anymore */
    00660       AddSideToSignalBuffer(tile,    ReverseDiagDir(dir), owner);
    00661       AddSideToSignalBuffer(endtile, dir,                 owner);
    00662
    00663       YapfNotifyTrackLayoutChange(tile,    track);
    00664       YapfNotifyTrackLayoutChange(endtile, track);
    00665
    00666       if (v != NULL) TryPathReserve(v);
    00667     } else {
    00668       DoClearSquare(tile);
    00669       DoClearSquare(endtile);
    00670     }
    00671   }
    00672   return CommandCost(EXPENSES_CONSTRUCTION, _price.clear_tunnel * (GetTunnelBridgeLength(tile, endtile) + 2));
    00673 }
    00674
    00675
    00676 static CommandCost DoClearBridge(TileIndex tile, DoCommandFlag flags)
    00677 {
    00678   DiagDirection direction;
    00679   TileIndexDiff delta;
    00680   TileIndex endtile;
    00681   Town *t = NULL;
    00682
    00683   if (!CheckAllowRemoveTunnelBridge(tile)) return CMD_ERROR;
    00684
    00685   endtile = GetOtherBridgeEnd(tile);
    00686
    00687   if (HasVehicleOnTunnelBridge(tile, endtile)) return CMD_ERROR;
    00688
    00689   direction = GetTunnelBridgeDirection(tile);
    00690   delta = TileOffsByDiagDir(direction);
    00691
    00692   if (IsTileOwner(tile, OWNER_TOWN) && _game_mode != GM_EDITOR) {
    00693     t = ClosestTownFromTile(tile, UINT_MAX); // town penalty rating
    00694
    00695     /* Check if you are allowed to remove the bridge owned by a town
    00696      * Removal depends on difficulty settings */
    00697     if (!CheckforTownRating(flags, t, TUNNELBRIDGE_REMOVE)) {
    00698       SetDParam(0, t->index);
    00699       return_cmd_error(STR_2009_LOCAL_AUTHORITY_REFUSES);
    00700     }
    00701   }
    00702
    00703   /* checks if the owner is town then decrease town rating by RATING_TUNNEL_BRIDGE_DOWN_STEP until
    00704    * you have a "Poor" (0) town rating */
    00705   if (IsTileOwner(tile, OWNER_TOWN) && _game_mode != GM_EDITOR) {
    00706     ChangeTownRating(t, RATING_TUNNEL_BRIDGE_DOWN_STEP, RATING_TUNNEL_BRIDGE_MINIMUM, flags);
    00707   }
    00708
    00709   if (flags & DC_EXEC) {
    00710     /* read this value before actual removal of bridge */
    00711     bool rail = GetTunnelBridgeTransportType(tile) == TRANSPORT_RAIL;
    00712     Owner owner = GetTileOwner(tile);
    00713     uint height = GetBridgeHeight(tile);
    00714     Vehicle *v = NULL;
    00715
    00716     if (rail && GetTunnelBridgeReservation(tile)) {
    00717       v = GetTrainForReservation(tile, DiagDirToDiagTrack(direction));
    00718       if (v != NULL) FreeTrainTrackReservation(v);
    00719     }
    00720
    00721     DoClearSquare(tile);
    00722     DoClearSquare(endtile);
    00723     for (TileIndex c = tile + delta; c != endtile; c += delta) {
    00724       /* do not let trees appear from 'nowhere' after removing bridge */
    00725       if (IsNormalRoadTile(c) && GetRoadside(c) == ROADSIDE_TREES) {
    00726         uint minz = GetTileMaxZ(c) + 3 * TILE_HEIGHT;
    00727         if (height < minz) SetRoadside(c, ROADSIDE_PAVED);
    00728       }
    00729       ClearBridgeMiddle(c);
    00730       MarkTileDirtyByTile(c);
    00731     }
    00732
    00733     if (rail) {
    00734       /* cannot use INVALID_DIAGDIR for signal update because the bridge doesn't exist anymore */
    00735       AddSideToSignalBuffer(tile,    ReverseDiagDir(direction), owner);
    00736       AddSideToSignalBuffer(endtile, direction,                 owner);
    00737
    00738       Track track = DiagDirToDiagTrack(direction);
    00739       YapfNotifyTrackLayoutChange(tile,    track);
    00740       YapfNotifyTrackLayoutChange(endtile, track);
    00741
    00742       if (v != NULL) TryPathReserve(v, true);
    00743     }
    00744   }
    00745
    00746   return CommandCost(EXPENSES_CONSTRUCTION, (GetTunnelBridgeLength(tile, endtile) + 2) * _price.clear_bridge);
    00747 }
    00748
    00749 static CommandCost ClearTile_TunnelBridge(TileIndex tile, DoCommandFlag flags)
    00750 {
    00751   if (IsTunnel(tile)) {
    00752     if (flags & DC_AUTO) return_cmd_error(STR_5006_MUST_DEMOLISH_TUNNEL_FIRST);
    00753     return DoClearTunnel(tile, flags);
    00754   } else { // IsBridge(tile)
    00755     if (flags & DC_AUTO) return_cmd_error(STR_5007_MUST_DEMOLISH_BRIDGE_FIRST);
    00756     return DoClearBridge(tile, flags);
    00757   }
    00758
    00759   return CMD_ERROR;
    00760 }
    00761
    00773 static void DrawBridgePillars(const PalSpriteID *psid, const TileInfo *ti, Axis axis, bool drawfarpillar, int x, int y, int z_bridge)
    00774 {
    00775   /* Do not draw bridge pillars if they are invisible */
    00776   if (IsInvisibilitySet(TO_BRIDGES)) return;
    00777
    00778   SpriteID image = psid->sprite;
    00779
    00780   if (image != 0) {
    00781     /* "side" specifies the side the pillars stand on.
    00782      * The length of the pillars is then set to the height of the bridge over the corners of this edge.
    00783      *
    00784      *                axis==AXIS_X  axis==AXIS_Y
    00785      *   side==false      SW            NW
    00786      *   side==true       NE            SE
    00787      *
    00788      * I have no clue, why this was done this way.
    00789      */
    00790     bool side = HasBit(image, 0);
    00791
    00792     /* "dir" means the edge the pillars stand on */
    00793     DiagDirection dir = AxisToDiagDir(axis);
    00794     if (side != (axis == AXIS_Y)) dir = ReverseDiagDir(dir);
    00795
    00796     /* Determine ground height under pillars */
    00797     int front_height = ti->z;
    00798     int back_height = ti->z;
    00799     GetSlopeZOnEdge(ti->tileh, dir, &front_height, &back_height);
    00800
    00801     /* x and y size of bounding-box of pillars */
    00802     int w = (axis == AXIS_X ? 16 : 2);
    00803     int h = (axis == AXIS_X ? 2 : 16);
    00804     /* sprite position of back facing pillar */
    00805     int x_back = x - (axis == AXIS_X ? 0 : 9);
    00806     int y_back = y - (axis == AXIS_X ? 9 : 0);
    00807
    00808     for (int cur_z = z_bridge; cur_z >= front_height || cur_z >= back_height; cur_z -= TILE_HEIGHT) {
    00809       /* Draw front facing pillar */
    00810       if (cur_z >= front_height) {
    00811         AddSortableSpriteToDraw(image, psid->pal, x, y, w, h, BB_HEIGHT_UNDER_BRIDGE - 5, cur_z, IsTransparencySet(TO_BRIDGES), 0, 0, -5);
    00812       }
    00813
    00814       /* Draw back facing pillar, but not the highest part directly under the bridge-floor */
    00815       if (drawfarpillar && cur_z >= back_height && cur_z < z_bridge - TILE_HEIGHT) {
    00816         AddSortableSpriteToDraw(image, psid->pal, x_back, y_back, w, h, BB_HEIGHT_UNDER_BRIDGE - 5, cur_z, IsTransparencySet(TO_BRIDGES), 0, 0, -5);
    00817       }
    00818     }
    00819   }
    00820 }
    00821
    00831 static void DrawBridgeTramBits(int x, int y, byte z, int offset, bool overlay, bool head)
    00832 {
    00833   static const SpriteID tram_offsets[2][6] = { { 107, 108, 109, 110, 111, 112 }, { 4, 5, 15, 16, 17, 18 } };
    00834   static const SpriteID back_offsets[6]    =   {  95,  96,  99, 102, 100, 101 };
    00835   static const SpriteID front_offsets[6]   =   {  97,  98, 103, 106, 104, 105 };
    00836
    00837   static const uint size_x[6] = {  1, 16, 16,  1, 16,  1 };
    00838   static const uint size_y[6] = { 16,  1,  1, 16,  1, 16 };
    00839   static const uint front_bb_offset_x[6] = { 15,  0,  0, 15,  0, 15 };
    00840   static const uint front_bb_offset_y[6] = {  0, 15, 15,  0, 15,  0 };
    00841
    00842   /* The sprites under the vehicles are drawn as SpriteCombine. StartSpriteCombine() has already been called
    00843    * The bounding boxes here are the same as for bridge front/roof */
    00844   if (head || !IsInvisibilitySet(TO_BRIDGES)) {
    00845     AddSortableSpriteToDraw(SPR_TRAMWAY_BASE + tram_offsets[overlay][offset], PAL_NONE,
    00846       x, y, size_x[offset], size_y[offset], 0x28, z,
    00847       !head && IsTransparencySet(TO_BRIDGES));
    00848   }
    00849
    00850   /* Do not draw catenary if it is set invisible */
    00851   if (!IsInvisibilitySet(TO_CATENARY)) {
    00852     AddSortableSpriteToDraw(SPR_TRAMWAY_BASE + back_offsets[offset], PAL_NONE,
    00853       x, y, size_x[offset], size_y[offset], 0x28, z,
    00854       IsTransparencySet(TO_CATENARY));
    00855   }
    00856
    00857   /* Start a new SpriteCombine for the front part */
    00858   EndSpriteCombine();
    00859   StartSpriteCombine();
    00860
    00861   /* For sloped sprites the bounding box needs to be higher, as the pylons stop on a higher point */
    00862   if (!IsInvisibilitySet(TO_CATENARY)) {
    00863     AddSortableSpriteToDraw(SPR_TRAMWAY_BASE + front_offsets[offset], PAL_NONE,
    00864       x, y, size_x[offset] + front_bb_offset_x[offset], size_y[offset] + front_bb_offset_y[offset], 0x28, z,
    00865       IsTransparencySet(TO_CATENARY), front_bb_offset_x[offset], front_bb_offset_y[offset]);
    00866   }
    00867 }
    00868
    00882 static void DrawTile_TunnelBridge(TileInfo *ti)
    00883 {
    00884   SpriteID image;
    00885   TransportType transport_type = GetTunnelBridgeTransportType(ti->tile);
    00886   DiagDirection tunnelbridge_direction = GetTunnelBridgeDirection(ti->tile);
    00887
    00888   if (IsTunnel(ti->tile)) {
    00889     /* Front view of tunnel bounding boxes:
    00890      *
    00891      *   122223  <- BB_Z_SEPARATOR
    00892      *   1    3
    00893      *   1    3                1,3 = empty helper BB
    00894      *   1    3                  2 = SpriteCombine of tunnel-roof and catenary (tram & elrail)
    00895      *
    00896      */
    00897
    00898     static const int _tunnel_BB[4][12] = {
    00899       /*  tunnnel-roof  |  Z-separator  | tram-catenary
    00900        * w  h  bb_x bb_y| x   y   w   h |bb_x bb_y w h */
    00901       {  1,  0, -15, -14,  0, 15, 16,  1, 0, 1, 16, 15 }, // NE
    00902       {  0,  1, -14, -15, 15,  0,  1, 16, 1, 0, 15, 16 }, // SE
    00903       {  1,  0, -15, -14,  0, 15, 16,  1, 0, 1, 16, 15 }, // SW
    00904       {  0,  1, -14, -15, 15,  0,  1, 16, 1, 0, 15, 16 }, // NW
    00905     };
    00906     const int *BB_data = _tunnel_BB[tunnelbridge_direction];
    00907
    00908     bool catenary = false;
    00909
    00910     if (transport_type == TRANSPORT_RAIL) {
    00911       image = GetRailTypeInfo(GetRailType(ti->tile))->base_sprites.tunnel;
    00912     } else {
    00913       image = SPR_TUNNEL_ENTRY_REAR_ROAD;
    00914     }
    00915
    00916     if (HasTunnelBridgeSnowOrDesert(ti->tile)) image += 32;
    00917
    00918     image += tunnelbridge_direction * 2;
    00919     DrawGroundSprite(image, PAL_NONE);
    00920
    00921     /* PBS debugging, draw reserved tracks darker */
    00922     if (_game_mode != GM_MENU && _settings_client.gui.show_track_reservation && (transport_type == TRANSPORT_RAIL && GetTunnelBridgeReservation(ti->tile))) {
    00923       const RailtypeInfo *rti = GetRailTypeInfo(GetRailType(ti->tile));
    00924       DrawGroundSprite(DiagDirToAxis(tunnelbridge_direction) == AXIS_X ? rti->base_sprites.single_y : rti->base_sprites.single_x, PALETTE_CRASH);
    00925     }
    00926
    00927     if (transport_type == TRANSPORT_ROAD) {
    00928       RoadTypes rts = GetRoadTypes(ti->tile);
    00929
    00930       if (HasBit(rts, ROADTYPE_TRAM)) {
    00931         static const SpriteID tunnel_sprites[2][4] = { { 28, 78, 79, 27 }, {  5, 76, 77,  4 } };
    00932
    00933         DrawGroundSprite(SPR_TRAMWAY_BASE + tunnel_sprites[rts - ROADTYPES_TRAM][tunnelbridge_direction], PAL_NONE);
    00934
    00935         /* Do not draw wires if they are invisible */
    00936         if (!IsInvisibilitySet(TO_CATENARY)) {
    00937           catenary = true;
    00938           StartSpriteCombine();
    00939           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);
    00940         }
    00941       }
    00942     } else if (HasCatenaryDrawn(GetRailType(ti->tile))) {
    00943       /* Maybe draw pylons on the entry side */
    00944       DrawCatenary(ti);
    00945
    00946       catenary = true;
    00947       StartSpriteCombine();
    00948       /* Draw wire above the ramp */
    00949       DrawCatenaryOnTunnel(ti);
    00950     }
    00951
    00952     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);
    00953
    00954     if (catenary) EndSpriteCombine();
    00955
    00956     /* Add helper BB for sprite sorting, that separate the tunnel from things beside of it */
    00957     AddSortableSpriteToDraw(SPR_EMPTY_BOUNDING_BOX, PAL_NONE, ti->x             , ti->y             , BB_data[6], BB_data[7], TILE_HEIGHT, ti->z);
    00958     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);
    00959
    00960     DrawBridgeMiddle(ti);
    00961   } else { // IsBridge(ti->tile)
    00962     const PalSpriteID *psid;
    00963     int base_offset;
    00964     bool ice = HasTunnelBridgeSnowOrDesert(ti->tile);
    00965
    00966     if (transport_type == TRANSPORT_RAIL) {
    00967       base_offset = GetRailTypeInfo(GetRailType(ti->tile))->bridge_offset;
    00968       assert(base_offset != 8); // This one is used for roads
    00969     } else {
    00970       base_offset = 8;
    00971     }
    00972
    00973     /* as the lower 3 bits are used for other stuff, make sure they are clear */
    00974     assert( (base_offset & 0x07) == 0x00);
    00975
    00976     DrawFoundation(ti, GetBridgeFoundation(ti->tileh, DiagDirToAxis(tunnelbridge_direction)));
    00977
    00978     /* HACK Wizardry to convert the bridge ramp direction into a sprite offset */
    00979     base_offset += (6 - tunnelbridge_direction) % 4;
    00980
    00981     if (ti->tileh == SLOPE_FLAT) base_offset += 4; // sloped bridge head
    00982
    00983     /* Table number BRIDGE_PIECE_HEAD always refers to the bridge heads for any bridge type */
    00984     if (transport_type != TRANSPORT_WATER) {
    00985       psid = &GetBridgeSpriteTable(GetBridgeType(ti->tile), BRIDGE_PIECE_HEAD)[base_offset];
    00986     } else {
    00987       psid = _aqueduct_sprites + base_offset;
    00988     }
    00989
    00990     if (!ice) {
    00991       DrawClearLandTile(ti, 3);
    00992     } else {
    00993       DrawGroundSprite(SPR_FLAT_SNOWY_TILE + _tileh_to_sprite[ti->tileh], PAL_NONE);
    00994     }
    00995
    00996     /* draw ramp */
    00997
    00998     /* Draw Trambits and PBS Reservation as SpriteCombine */
    00999     if (transport_type == TRANSPORT_ROAD || transport_type == TRANSPORT_RAIL) StartSpriteCombine();
    01000
    01001     /* HACK set the height of the BB of a sloped ramp to 1 so a vehicle on
    01002      * it doesn't disappear behind it
    01003      */
    01004     /* Bridge heads are drawn solid no matter how invisibility/transparency is set */
    01005     AddSortableSpriteToDraw(psid->sprite, psid->pal, ti->x, ti->y, 16, 16, ti->tileh == SLOPE_FLAT ? 0 : 8, ti->z);
    01006
    01007     if (_game_mode != GM_MENU && _settings_client.gui.show_track_reservation && transport_type == TRANSPORT_RAIL && GetTunnelBridgeReservation(ti->tile)) {
    01008       const RailtypeInfo *rti = GetRailTypeInfo(GetRailType(ti->tile));
    01009       if (HasBridgeFlatRamp(ti->tileh, DiagDirToAxis(tunnelbridge_direction))) {
    01010         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);
    01011       } else {
    01012         AddSortableSpriteToDraw(rti->base_sprites.single_sloped + tunnelbridge_direction, PALETTE_CRASH, ti->x, ti->y, 16, 16, 8, ti->z);
    01013       }
    01014     }
    01015
    01016     if (transport_type == TRANSPORT_ROAD) {
    01017       RoadTypes rts = GetRoadTypes(ti->tile);
    01018
    01019       if (HasBit(rts, ROADTYPE_TRAM)) {
    01020         uint offset = tunnelbridge_direction;
    01021         uint z = ti->z;
    01022         if (ti->tileh != SLOPE_FLAT) {
    01023           offset = (offset + 1) & 1;
    01024           z += TILE_HEIGHT;
    01025         } else {
    01026           offset += 2;
    01027         }
    01028         /* DrawBridgeTramBits() calls EndSpriteCombine() and StartSpriteCombine() */
    01029         DrawBridgeTramBits(ti->x, ti->y, z, offset, HasBit(rts, ROADTYPE_ROAD), true);
    01030       }
    01031       EndSpriteCombine();
    01032     } else if (transport_type == TRANSPORT_RAIL) {
    01033       EndSpriteCombine();
    01034       if (HasCatenaryDrawn(GetRailType(ti->tile))) {
    01035         DrawCatenary(ti);
    01036       }
    01037     }
    01038
    01039     DrawBridgeMiddle(ti);
    01040   }
    01041 }
    01042
    01043
    01061 static BridgePieces CalcBridgePiece(uint north, uint south)
    01062 {
    01063   if (north == 1) {
    01064     return BRIDGE_PIECE_NORTH;
    01065   } else if (south == 1) {
    01066     return BRIDGE_PIECE_SOUTH;
    01067   } else if (north < south) {
    01068     return north & 1 ? BRIDGE_PIECE_INNER_SOUTH : BRIDGE_PIECE_INNER_NORTH;
    01069   } else if (north > south) {
    01070     return south & 1 ? BRIDGE_PIECE_INNER_NORTH : BRIDGE_PIECE_INNER_SOUTH;
    01071   } else {
    01072     return north & 1 ? BRIDGE_PIECE_MIDDLE_EVEN : BRIDGE_PIECE_MIDDLE_ODD;
    01073   }
    01074 }
    01075
    01076
    01077 void DrawBridgeMiddle(const TileInfo *ti)
    01078 {
    01079   /* Sectional view of bridge bounding boxes:
    01080    *
    01081    *  1           2                                1,2 = SpriteCombine of Bridge front/(back&floor) and TramCatenary
    01082    *  1           2                                  3 = empty helper BB
    01083    *  1     7     2                                4,5 = pillars under higher bridges
    01084    *  1 6 88888 6 2                                  6 = elrail-pylons
    01085    *  1 6 88888 6 2                                  7 = elrail-wire
    01086    *  1 6 88888 6 2  <- TILE_HEIGHT                  8 = rail-vehicle on bridge
    01087    *  3333333333333  <- BB_Z_SEPARATOR
    01088    *                 <- unused
    01089    *    4       5    <- BB_HEIGHT_UNDER_BRIDGE
    01090    *    4       5
    01091    *    4       5
    01092    *
    01093    */
    01094
    01095   /* Z position of the bridge sprites relative to bridge height (downwards) */
    01096   static const int BRIDGE_Z_START = 3;
    01097
    01098   if (!IsBridgeAbove(ti->tile)) return;
    01099
    01100   TileIndex rampnorth = GetNorthernBridgeEnd(ti->tile);
    01101   TileIndex rampsouth = GetSouthernBridgeEnd(ti->tile);
    01102   TransportType transport_type = GetTunnelBridgeTransportType(rampsouth);
    01103
    01104   Axis axis = GetBridgeAxis(ti->tile);
    01105   BridgePieces piece = CalcBridgePiece(
    01106     GetTunnelBridgeLength(ti->tile, rampnorth) + 1,
    01107     GetTunnelBridgeLength(ti->tile, rampsouth) + 1
    01108   );
    01109
    01110   const PalSpriteID *psid;
    01111   bool drawfarpillar;
    01112   if (transport_type != TRANSPORT_WATER) {
    01113     BridgeType type =  GetBridgeType(rampsouth);
    01114     drawfarpillar = !HasBit(GetBridgeSpec(type)->flags, 0);
    01115
    01116     uint base_offset;
    01117     if (transport_type == TRANSPORT_RAIL) {
    01118       base_offset = GetRailTypeInfo(GetRailType(rampsouth))->bridge_offset;
    01119     } else {
    01120       base_offset = 8;
    01121     }
    01122
    01123     psid = base_offset + GetBridgeSpriteTable(type, piece);
    01124   } else {
    01125     drawfarpillar = true;
    01126     psid = _aqueduct_sprites;
    01127   }
    01128
    01129   if (axis != AXIS_X) psid += 4;
    01130
    01131   int x = ti->x;
    01132   int y = ti->y;
    01133   uint bridge_z = GetBridgeHeight(rampsouth);
    01134   uint z = bridge_z - BRIDGE_Z_START;
    01135
    01136   /* Add a bounding box, that separates the bridge from things below it. */
    01137   AddSortableSpriteToDraw(SPR_EMPTY_BOUNDING_BOX, PAL_NONE, x, y, 16, 16, 1, bridge_z - TILE_HEIGHT + BB_Z_SEPARATOR);
    01138
    01139   /* Draw Trambits as SpriteCombine */
    01140   if (transport_type == TRANSPORT_ROAD) StartSpriteCombine();
    01141
    01142   /* Draw floor and far part of bridge*/
    01143   if (!IsInvisibilitySet(TO_BRIDGES)) {
    01144     if (axis == AXIS_X) {
    01145       AddSortableSpriteToDraw(psid->sprite, psid->pal, x, y, 16, 1, 0x28, z, IsTransparencySet(TO_BRIDGES), 0, 0, BRIDGE_Z_START);
    01146     } else {
    01147       AddSortableSpriteToDraw(psid->sprite, psid->pal, x, y, 1, 16, 0x28, z, IsTransparencySet(TO_BRIDGES), 0, 0, BRIDGE_Z_START);
    01148     }
    01149   }
    01150
    01151   psid++;
    01152
    01153   if (transport_type == TRANSPORT_ROAD) {
    01154     RoadTypes rts = GetRoadTypes(rampsouth);
    01155
    01156     if (HasBit(rts, ROADTYPE_TRAM)) {
    01157       /* DrawBridgeTramBits() calls EndSpriteCombine() and StartSpriteCombine() */
    01158       DrawBridgeTramBits(x, y, bridge_z, axis ^ 1, HasBit(rts, ROADTYPE_ROAD), false);
    01159     } else {
    01160       EndSpriteCombine();
    01161       StartSpriteCombine();
    01162     }
    01163   } else if (transport_type == TRANSPORT_RAIL) {
    01164     if (HasCatenaryDrawn(GetRailType(rampsouth))) {
    01165       DrawCatenaryOnBridge(ti);
    01166     }
    01167   }
    01168
    01169   /* draw roof, the component of the bridge which is logically between the vehicle and the camera */
    01170   if (!IsInvisibilitySet(TO_BRIDGES)) {
    01171     if (axis == AXIS_X) {
    01172       y += 12;
    01173       if (psid->sprite & SPRITE_MASK) AddSortableSpriteToDraw(psid->sprite, psid->pal, x, y, 16, 4, 0x28, z, IsTransparencySet(TO_BRIDGES), 0, 3, BRIDGE_Z_START);
    01174     } else {
    01175       x += 12;
    01176       if (psid->sprite & SPRITE_MASK) AddSortableSpriteToDraw(psid->sprite, psid->pal, x, y, 4, 16, 0x28, z, IsTransparencySet(TO_BRIDGES), 3, 0, BRIDGE_Z_START);
    01177     }
    01178   }
    01179
    01180   /* Draw TramFront as SpriteCombine */
    01181   if (transport_type == TRANSPORT_ROAD) EndSpriteCombine();
    01182
    01183   /* Do not draw anything more if bridges are invisible */
    01184   if (IsInvisibilitySet(TO_BRIDGES)) return;
    01185
    01186   psid++;
    01187   if (ti->z + 5 == z) {
    01188     /* draw poles below for small bridges */
    01189     if (psid->sprite != 0) {
    01190       SpriteID image = psid->sprite;
    01191       SpriteID pal   = psid->pal;
    01192       if (IsTransparencySet(TO_BRIDGES)) {
    01193         SetBit(image, PALETTE_MODIFIER_TRANSPARENT);
    01194         pal = PALETTE_TO_TRANSPARENT;
    01195       }
    01196
    01197       DrawGroundSpriteAt(image, pal, x, y, z);
    01198     }
    01199   } else if (_settings_client.gui.bridge_pillars) {
    01200     /* draw pillars below for high bridges */
    01201     DrawBridgePillars(psid, ti, axis, drawfarpillar, x, y, z);
    01202   }
    01203 }
    01204
    01205
    01206 static uint GetSlopeZ_TunnelBridge(TileIndex tile, uint x, uint y)
    01207 {
    01208   uint z;
    01209   Slope tileh = GetTileSlope(tile, &z);
    01210
    01211   x &= 0xF;
    01212   y &= 0xF;
    01213
    01214   if (IsTunnel(tile)) {
    01215     uint pos = (DiagDirToAxis(GetTunnelBridgeDirection(tile)) == AXIS_X ? y : x);
    01216
    01217     /* In the tunnel entrance? */
    01218     if (5 <= pos && pos <= 10) return z;
    01219   } else { // IsBridge(tile)
    01220     DiagDirection dir = GetTunnelBridgeDirection(tile);
    01221     uint pos = (DiagDirToAxis(dir) == AXIS_X ? y : x);
    01222
    01223     z += ApplyFoundationToSlope(GetBridgeFoundation(tileh, DiagDirToAxis(dir)), &tileh);
    01224
    01225     /* On the bridge ramp? */
    01226     if (5 <= pos && pos <= 10) {
    01227       uint delta;
    01228
    01229       if (tileh != SLOPE_FLAT) return z + TILE_HEIGHT;
    01230
    01231       switch (dir) {
    01232         default: NOT_REACHED();
    01233         case DIAGDIR_NE: delta = (TILE_SIZE - 1 - x) / 2; break;
    01234         case DIAGDIR_SE: delta = y / 2; break;
    01235         case DIAGDIR_SW: delta = x / 2; break;
    01236         case DIAGDIR_NW: delta = (TILE_SIZE - 1 - y) / 2; break;
    01237       }
    01238       return z + 1 + delta;
    01239     }
    01240   }
    01241
    01242   return z + GetPartialZ(x, y, tileh);
    01243 }
    01244
    01245 static Foundation GetFoundation_TunnelBridge(TileIndex tile, Slope tileh)
    01246 {
    01247   return IsTunnel(tile) ? FOUNDATION_NONE : GetBridgeFoundation(tileh, DiagDirToAxis(GetTunnelBridgeDirection(tile)));
    01248 }
    01249
    01250
    01251 static void GetAcceptedCargo_TunnelBridge(TileIndex tile, AcceptedCargo ac)
    01252 {
    01253   /* not used */
    01254 }
    01255
    01256 static void GetTileDesc_TunnelBridge(TileIndex tile, TileDesc *td)
    01257 {
    01258   TransportType tt = GetTunnelBridgeTransportType(tile);
    01259
    01260   if (IsTunnel(tile)) {
    01261     td->str = (tt == TRANSPORT_RAIL) ? STR_5017_RAILROAD_TUNNEL : STR_5018_ROAD_TUNNEL;
    01262   } else { // IsBridge(tile)
    01263     td->str = (tt == TRANSPORT_WATER) ? STR_AQUEDUCT : GetBridgeSpec(GetBridgeType(tile))->transport_name[tt];
    01264   }
    01265   td->owner[0] = GetTileOwner(tile);
    01266
    01267   Owner road_owner = INVALID_OWNER;
    01268   Owner tram_owner = INVALID_OWNER;
    01269   RoadTypes rts = GetRoadTypes(tile);
    01270   if (HasBit(rts, ROADTYPE_ROAD)) road_owner = GetRoadOwner(tile, ROADTYPE_ROAD);
    01271   if (HasBit(rts, ROADTYPE_TRAM)) tram_owner = GetRoadOwner(tile, ROADTYPE_TRAM);
    01272
    01273   /* Is there a mix of owners? */
    01274   if ((tram_owner != INVALID_OWNER && tram_owner != td->owner[0]) ||
    01275       (road_owner != INVALID_OWNER && road_owner != td->owner[0])) {
    01276     uint i = 1;
    01277     if (road_owner != INVALID_OWNER) {
    01278       td->owner_type[i] = STR_ROAD_OWNER;
    01279       td->owner[i] = road_owner;
    01280       i++;
    01281     }
    01282     if (tram_owner != INVALID_OWNER) {
    01283       td->owner_type[i] = STR_TRAM_OWNER;
    01284       td->owner[i] = tram_owner;
    01285     }
    01286   }
    01287 }
    01288
    01289
    01290 static void TileLoop_TunnelBridge(TileIndex tile)
    01291 {
    01292   bool snow_or_desert = HasTunnelBridgeSnowOrDesert(tile);
    01293   switch (_settings_game.game_creation.landscape) {
    01294     case LT_ARCTIC:
    01295       if (snow_or_desert != (GetTileZ(tile) > GetSnowLine())) {
    01296         SetTunnelBridgeSnowOrDesert(tile, !snow_or_desert);
    01297         MarkTileDirtyByTile(tile);
    01298       }
    01299       break;
    01300
    01301     case LT_TROPIC:
    01302       if (GetTropicZone(tile) == TROPICZONE_DESERT && !snow_or_desert) {
    01303         SetTunnelBridgeSnowOrDesert(tile, true);
    01304         MarkTileDirtyByTile(tile);
    01305       }
    01306       break;
    01307
    01308     default:
    01309       break;
    01310   }
    01311 }
    01312
    01313 static TrackStatus GetTileTrackStatus_TunnelBridge(TileIndex tile, TransportType mode, uint sub_mode, DiagDirection side)
    01314 {
    01315   TransportType transport_type = GetTunnelBridgeTransportType(tile);
    01316   if (transport_type != mode || (transport_type == TRANSPORT_ROAD && (GetRoadTypes(tile) & sub_mode) == 0)) return 0;
    01317
    01318   DiagDirection dir = GetTunnelBridgeDirection(tile);
    01319   if (side != INVALID_DIAGDIR && side != ReverseDiagDir(dir)) return 0;
    01320   return CombineTrackStatus(TrackBitsToTrackdirBits(DiagDirToDiagTrackBits(dir)), TRACKDIR_BIT_NONE);
    01321 }
    01322
    01323 static void ChangeTileOwner_TunnelBridge(TileIndex tile, Owner old_owner, Owner new_owner)
    01324 {
    01325   for (RoadType rt = ROADTYPE_ROAD; rt < ROADTYPE_END; rt++) {
    01326     /* Update all roadtypes, no matter if they are present */
    01327     if (GetRoadOwner(tile, rt) == old_owner) {
    01328       SetRoadOwner(tile, rt, new_owner == INVALID_OWNER ? OWNER_NONE : new_owner);
    01329     }
    01330   }
    01331
    01332   if (!IsTileOwner(tile, old_owner)) return;
    01333
    01334   if (new_owner != INVALID_OWNER) {
    01335     SetTileOwner(tile, new_owner);
    01336   } else {
    01337     if (CmdFailed(DoCommand(tile, 0, 0, DC_EXEC | DC_BANKRUPT, CMD_LANDSCAPE_CLEAR))) {
    01338       /* When clearing the bridge/tunnel failed there are still vehicles on/in
    01339        * the bridge/tunnel. As all *our* vehicles are already removed, they
    01340        * must be of another owner. Therefore this can't be rail tunnel/bridge.
    01341        * In that case we can safely reassign the ownership to OWNER_NONE. */
    01342       assert(GetTunnelBridgeTransportType(tile) != TRANSPORT_RAIL);
    01343       SetTileOwner(tile, OWNER_NONE);
    01344     }
    01345   }
    01346 }
    01347
    01348
    01349 static const byte _tunnel_fractcoord_1[4]    = {0x8E, 0x18, 0x81, 0xE8};
    01350 static const byte _tunnel_fractcoord_2[4]    = {0x81, 0x98, 0x87, 0x38};
    01351 static const byte _tunnel_fractcoord_3[4]    = {0x82, 0x88, 0x86, 0x48};
    01352 static const byte _exit_tunnel_track[4]      = {1, 2, 1, 2};
    01353
    01355 static const Trackdir _road_exit_tunnel_state[DIAGDIR_END] = {
    01356   TRACKDIR_X_SW, TRACKDIR_Y_NW, TRACKDIR_X_NE, TRACKDIR_Y_SE
    01357 };
    01358 static const byte _road_exit_tunnel_frame[4] = {2, 7, 9, 4};
    01359
    01360 static const byte _tunnel_fractcoord_4[4]    = {0x52, 0x85, 0x98, 0x29};
    01361 static const byte _tunnel_fractcoord_5[4]    = {0x92, 0x89, 0x58, 0x25};
    01362 static const byte _tunnel_fractcoord_6[4]    = {0x92, 0x89, 0x56, 0x45};
    01363 static const byte _tunnel_fractcoord_7[4]    = {0x52, 0x85, 0x96, 0x49};
    01364
    01365 static VehicleEnterTileStatus VehicleEnter_TunnelBridge(Vehicle *v, TileIndex tile, int x, int y)
    01366 {
    01367   int z = GetSlopeZ(x, y) - v->z_pos;
    01368
    01369   if (abs(z) > 2) return VETSB_CANNOT_ENTER;
    01370   const DiagDirection dir = GetTunnelBridgeDirection(tile);
    01371
    01372   if (IsTunnel(tile)) {
    01373     byte fc;
    01374     DiagDirection vdir;
    01375
    01376     if (v->type == VEH_TRAIN) {
    01377       fc = (x & 0xF) + (y << 4);
    01378
    01379       vdir = DirToDiagDir(v->direction);
    01380
    01381       if (v->u.rail.track != TRACK_BIT_WORMHOLE && dir == vdir) {
    01382         if (IsFrontEngine(v) && fc == _tunnel_fractcoord_1[dir]) {
    01383           if (!PlayVehicleSound(v, VSE_TUNNEL) && RailVehInfo(v->engine_type)->engclass == 0) {
    01384             SndPlayVehicleFx(SND_05_TRAIN_THROUGH_TUNNEL, v);
    01385           }
    01386           return VETSB_CONTINUE;
    01387         }
    01388         if (fc == _tunnel_fractcoord_2[dir]) {
    01389           v->tile = tile;
    01390           v->u.rail.track = TRACK_BIT_WORMHOLE;
    01391           v->vehstatus |= VS_HIDDEN;
    01392           return VETSB_ENTERED_WORMHOLE;
    01393         }
    01394       }
    01395
    01396       if (dir == ReverseDiagDir(vdir) && fc == _tunnel_fractcoord_3[dir] && z == 0) {
    01397         /* We're at the tunnel exit ?? */
    01398         v->tile = tile;
    01399         v->u.rail.track = (TrackBits)_exit_tunnel_track[dir];
    01400         assert(v->u.rail.track);
    01401         v->vehstatus &= ~VS_HIDDEN;
    01402         return VETSB_ENTERED_WORMHOLE;
    01403       }
    01404     } else if (v->type == VEH_ROAD) {
    01405       fc = (x & 0xF) + (y << 4);
    01406       vdir = DirToDiagDir(v->direction);
    01407
    01408       /* Enter tunnel? */
    01409       if (v->u.road.state != RVSB_WORMHOLE && dir == vdir) {
    01410         if (fc == _tunnel_fractcoord_4[dir] ||
    01411             fc == _tunnel_fractcoord_5[dir]) {
    01412           v->tile = tile;
    01413           v->u.road.state = RVSB_WORMHOLE;
    01414           v->vehstatus |= VS_HIDDEN;
    01415           return VETSB_ENTERED_WORMHOLE;
    01416         } else {
    01417           return VETSB_CONTINUE;
    01418         }
    01419       }
    01420
    01421       if (dir == ReverseDiagDir(vdir) && (
    01422             /* We're at the tunnel exit ?? */
    01423             fc == _tunnel_fractcoord_6[dir] ||
    01424             fc == _tunnel_fractcoord_7[dir]
    01425           ) &&
    01426           z == 0) {
    01427         v->tile = tile;
    01428         v->u.road.state = _road_exit_tunnel_state[dir];
    01429         v->u.road.frame = _road_exit_tunnel_frame[dir];
    01430         v->vehstatus &= ~VS_HIDDEN;
    01431         return VETSB_ENTERED_WORMHOLE;
    01432       }
    01433     }
    01434   } else { // IsBridge(tile)
    01435
    01436     if (v->IsPrimaryVehicle() && v->type != VEH_SHIP) {
    01437       /* modify speed of vehicle */
    01438       uint16 spd = GetBridgeSpec(GetBridgeType(tile))->speed;
    01439
    01440       if (v->type == VEH_ROAD) spd *= 2;
    01441       if (v->cur_speed > spd) v->cur_speed = spd;
    01442     }
    01443
    01444     if (DirToDiagDir(v->direction) == dir) {
    01445       switch (dir) {
    01446         default: NOT_REACHED();
    01447         case DIAGDIR_NE: if ((x & 0xF) != 0)             return VETSB_CONTINUE; break;
    01448         case DIAGDIR_SE: if ((y & 0xF) != TILE_SIZE - 1) return VETSB_CONTINUE; break;
    01449         case DIAGDIR_SW: if ((x & 0xF) != TILE_SIZE - 1) return VETSB_CONTINUE; break;
    01450         case DIAGDIR_NW: if ((y & 0xF) != 0)             return VETSB_CONTINUE; break;
    01451       }
    01452       switch (v->type) {
    01453         case VEH_TRAIN:
    01454           v->u.rail.track = TRACK_BIT_WORMHOLE;
    01455           ClrBit(v->u.rail.flags, VRF_GOINGUP);
    01456           ClrBit(v->u.rail.flags, VRF_GOINGDOWN);
    01457           break;
    01458
    01459         case VEH_ROAD:
    01460           v->u.road.state = RVSB_WORMHOLE;
    01461           break;
    01462
    01463         case VEH_SHIP:
    01464           v->u.ship.state = TRACK_BIT_WORMHOLE;
    01465           break;
    01466
    01467         default: NOT_REACHED();
    01468       }
    01469       return VETSB_ENTERED_WORMHOLE;
    01470     } else if (DirToDiagDir(v->direction) == ReverseDiagDir(dir)) {
    01471       v->tile = tile;
    01472       switch (v->type) {
    01473         case VEH_TRAIN:
    01474           if (v->u.rail.track == TRACK_BIT_WORMHOLE) {
    01475             v->u.rail.track = (DiagDirToAxis(dir) == AXIS_X ? TRACK_BIT_X : TRACK_BIT_Y);
    01476             return VETSB_ENTERED_WORMHOLE;
    01477           }
    01478           break;
    01479
    01480         case VEH_ROAD:
    01481           if (v->u.road.state == RVSB_WORMHOLE) {
    01482             v->u.road.state = _road_exit_tunnel_state[dir];
    01483             v->u.road.frame = 0;
    01484             return VETSB_ENTERED_WORMHOLE;
    01485           }
    01486           break;
    01487
    01488         case VEH_SHIP:
    01489           if (v->u.ship.state == TRACK_BIT_WORMHOLE) {
    01490             v->u.ship.state = (DiagDirToAxis(dir) == AXIS_X ? TRACK_BIT_X : TRACK_BIT_Y);
    01491             return VETSB_ENTERED_WORMHOLE;
    01492           }
    01493           break;
    01494
    01495         default: NOT_REACHED();
    01496       }
    01497     }
    01498   }
    01499   return VETSB_CONTINUE;
    01500 }
    01501
    01502 static CommandCost TerraformTile_TunnelBridge(TileIndex tile, DoCommandFlag flags, uint z_new, Slope tileh_new)
    01503 {
    01504   if (_settings_game.construction.build_on_slopes && AutoslopeEnabled() && IsBridge(tile) && GetTunnelBridgeTransportType(tile) != TRANSPORT_WATER) {
    01505     DiagDirection direction = GetTunnelBridgeDirection(tile);
    01506     Axis axis = DiagDirToAxis(direction);
    01507     CommandCost res;
    01508     uint z_old;
    01509     Slope tileh_old = GetTileSlope(tile, &z_old);
    01510
    01511     /* Check if new slope is valid for bridges in general (so we can safely call GetBridgeFoundation()) */
    01512     if ((direction == DIAGDIR_NW) || (direction == DIAGDIR_NE)) {
    01513       CheckBridgeSlopeSouth(axis, &tileh_old, &z_old);
    01514       res = CheckBridgeSlopeSouth(axis, &tileh_new, &z_new);
    01515     } else {
    01516       CheckBridgeSlopeNorth(axis, &tileh_old, &z_old);
    01517       res = CheckBridgeSlopeNorth(axis, &tileh_new, &z_new);
    01518     }
    01519
    01520     /* Surface slope is valid and remains unchanged? */
    01521     if (!CmdFailed(res) && (z_old == z_new) && (tileh_old == tileh_new)) return CommandCost(EXPENSES_CONSTRUCTION, _price.terraform);
    01522   }
    01523
    01524   return DoCommand(tile, 0, 0, flags, CMD_LANDSCAPE_CLEAR);
    01525 }
    01526
    01527 extern const TileTypeProcs _tile_type_tunnelbridge_procs = {
    01528   DrawTile_TunnelBridge,           // draw_tile_proc
    01529   GetSlopeZ_TunnelBridge,          // get_slope_z_proc
    01530   ClearTile_TunnelBridge,          // clear_tile_proc
    01531   GetAcceptedCargo_TunnelBridge,   // get_accepted_cargo_proc
    01532   GetTileDesc_TunnelBridge,        // get_tile_desc_proc
    01533   GetTileTrackStatus_TunnelBridge, // get_tile_track_status_proc
    01534   NULL,                            // click_tile_proc
    01535   NULL,                            // animate_tile_proc
    01536   TileLoop_TunnelBridge,           // tile_loop_clear
    01537   ChangeTileOwner_TunnelBridge,    // change_tile_owner_clear
    01538   NULL,                            // get_produced_cargo_proc
    01539   VehicleEnter_TunnelBridge,       // vehicle_enter_tile_proc
    01540   GetFoundation_TunnelBridge,      // get_foundation_proc
    01541   TerraformTile_TunnelBridge,      // terraform_tile_proc
    01542 };