# tunnelbridge_cmd.cpp

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    00001 /* $Id: tunnelbridge_cmd.cpp 14259 2008-09-07 11:54:00Z rubidium $ */
    00002
    00008 #include "stdafx.h"
    00009 #include "openttd.h"
    00010 #include "bridge_map.h"
    00011 #include "rail_map.h"
    00012 #include "road_map.h"
    00013 #include "tile_cmd.h"
    00014 #include "landscape.h"
    00015 #include "tunnel_map.h"
    00016 #include "unmovable_map.h"
    00017 #include "viewport_func.h"
    00018 #include "command_func.h"
    00019 #include "town.h"
    00020 #include "variables.h"
    00021 #include "bridge.h"
    00022 #include "train.h"
    00023 #include "water_map.h"
    00024 #include "yapf/yapf.h"
    00025 #include "newgrf_sound.h"
    00026 #include "autoslope.h"
    00027 #include "transparency.h"
    00028 #include "tunnelbridge_map.h"
    00029 #include "strings_func.h"
    00030 #include "date_func.h"
    00031 #include "functions.h"
    00032 #include "vehicle_func.h"
    00033 #include "sound_func.h"
    00034 #include "signal_func.h"
    00035 #include "tunnelbridge.h"
    00036 #include "player_base.h"
    00037
    00038 #include "table/sprites.h"
    00039 #include "table/strings.h"
    00040 #include "table/bridge_land.h"
    00041
    00042 BridgeSpec _bridge[MAX_BRIDGES];
    00043
    00045 void ResetBridges()
    00046 {
    00047   /* First, free sprite table data */
    00048   for (BridgeType i = 0; i < MAX_BRIDGES; i++) {
    00049     if (_bridge[i].sprite_table != NULL) {
    00050       for (uint j = 0; j < 7; j++) free(_bridge[i].sprite_table[j]);
    00051       free(_bridge[i].sprite_table);
    00052     }
    00053   }
    00054
    00055   /* Then, wipe out current bidges */
    00056   memset(&_bridge, 0, sizeof(_bridge));
    00057   /* And finally, reinstall default data */
    00058   memcpy(&_bridge, &_orig_bridge, sizeof(_orig_bridge));
    00059 }
    00060
    00064 int CalcBridgeLenCostFactor(int x)
    00065 {
    00066   int n;
    00067   int r;
    00068
    00069   if (x < 2) return x;
    00070   x -= 2;
    00071   for (n = 0, r = 2;; n++) {
    00072     if (x <= n) return r + x * n;
    00073     r += n * n;
    00074     x -= n;
    00075   }
    00076 }
    00077
    00078 Foundation GetBridgeFoundation(Slope tileh, Axis axis)
    00079 {
    00080   if ((tileh == SLOPE_FLAT) ||
    00081       (((tileh == SLOPE_NE) || (tileh == SLOPE_SW)) && (axis == AXIS_X)) ||
    00082       (((tileh == SLOPE_NW) || (tileh == SLOPE_SE)) && (axis == AXIS_Y))) return FOUNDATION_NONE;
    00083
    00084   return (HasSlopeHighestCorner(tileh) ? InclinedFoundation(axis) : FlatteningFoundation(tileh));
    00085 }
    00086
    00094 bool HasBridgeFlatRamp(Slope tileh, Axis axis)
    00095 {
    00096   ApplyFoundationToSlope(GetBridgeFoundation(tileh, axis), &tileh);
    00097   /* If the foundation slope is flat the bridge has a non-flat ramp and vice versa. */
    00098   return (tileh != SLOPE_FLAT);
    00099 }
    00100
    00101 static inline const PalSpriteID *GetBridgeSpriteTable(int index, byte table)
    00102 {
    00103   const BridgeSpec *bridge = GetBridgeSpec(index);
    00104   assert(table < 7);
    00105   if (bridge->sprite_table == NULL || bridge->sprite_table[table] == NULL) {
    00106     return _bridge_sprite_table[index][table];
    00107   } else {
    00108     return bridge->sprite_table[table];
    00109   }
    00110 }
    00111
    00112
    00121 static CommandCost CheckBridgeSlopeNorth(Axis axis, Slope *tileh, uint *z)
    00122 {
    00123   Foundation f = GetBridgeFoundation(*tileh, axis);
    00124   *z += ApplyFoundationToSlope(f, tileh);
    00125
    00126   Slope valid_inclined = (axis == AXIS_X ? SLOPE_NE : SLOPE_NW);
    00127   if ((*tileh != SLOPE_FLAT) && (*tileh != valid_inclined)) return CMD_ERROR;
    00128
    00129   if (f == FOUNDATION_NONE) return CommandCost();
    00130
    00131   return CommandCost(EXPENSES_CONSTRUCTION, _price.terraform);
    00132 }
    00133
    00142 static CommandCost CheckBridgeSlopeSouth(Axis axis, Slope *tileh, uint *z)
    00143 {
    00144   Foundation f = GetBridgeFoundation(*tileh, axis);
    00145   *z += ApplyFoundationToSlope(f, tileh);
    00146
    00147   Slope valid_inclined = (axis == AXIS_X ? SLOPE_SW : SLOPE_SE);
    00148   if ((*tileh != SLOPE_FLAT) && (*tileh != valid_inclined)) return CMD_ERROR;
    00149
    00150   if (f == FOUNDATION_NONE) return CommandCost();
    00151
    00152   return CommandCost(EXPENSES_CONSTRUCTION, _price.terraform);
    00153 }
    00154
    00155 bool CheckBridge_Stuff(BridgeType bridge_type, uint bridge_len, uint32 flags)
    00156 {
    00157   if (flags & DC_QUERY_COST) {
    00158     return bridge_len <= (_patches.longbridges ? 100U : 16U);
    00159   }
    00160
    00161   if (bridge_type >= MAX_BRIDGES) return false;
    00162
    00163   const BridgeSpec *b = GetBridgeSpec(bridge_type);
    00164   if (b->avail_year > _cur_year) return false;
    00165
    00166   uint max = b->max_length;
    00167   if (max >= 16 && _patches.longbridges) max = 100;
    00168
    00169   return b->min_length <= bridge_len && bridge_len <= max;
    00170 }
    00171
    00181 CommandCost CmdBuildBridge(TileIndex end_tile, uint32 flags, uint32 p1, uint32 p2)
    00182 {
    00183   BridgeType bridge_type;
    00184   RailType railtype = INVALID_RAILTYPE;
    00185   RoadTypes roadtypes = ROADTYPES_NONE;
    00186   uint x;
    00187   uint y;
    00188   uint sx;
    00189   uint sy;
    00190   TileIndex tile_start;
    00191   TileIndex tile_end;
    00192   Slope tileh_start;
    00193   Slope tileh_end;
    00194   uint z_start;
    00195   uint z_end;
    00196   TileIndex tile;
    00197   TileIndexDiff delta;
    00198   uint bridge_len;
    00199   Axis direction;
    00200   CommandCost cost(EXPENSES_CONSTRUCTION);
    00201   CommandCost ret;
    00202   bool replace_bridge = false;
    00203   BridgeType replaced_bridge_type;
    00204   TransportType transport_type;
    00205
    00206   /* unpack parameters */
    00207   bridge_type = GB(p2, 0, 8);
    00208
    00209   if (p1 >= MapSize()) return CMD_ERROR;
    00210
    00211   transport_type = (TransportType)GB(p2, 15, 2);
    00212
    00213   /* type of bridge */
    00214   switch (transport_type) {
    00215     case TRANSPORT_ROAD:
    00216       roadtypes = (RoadTypes)GB(p2, 8, 3);
    00217       if (!AreValidRoadTypes(roadtypes) || !HasRoadTypesAvail(_current_player, roadtypes)) return CMD_ERROR;
    00218       break;
    00219
    00220     case TRANSPORT_RAIL:
    00221       railtype = (RailType)GB(p2, 8, 8);
    00222       if (!ValParamRailtype(railtype)) return CMD_ERROR;
    00223       break;
    00224
    00225     default:
    00226       /* For now, only TRANSPORT_RAIL and TRANSPORT_ROAD are allowed.
    00227        * But let not this stops us for preparing the future */
    00228       return CMD_ERROR;
    00229   }
    00230
    00231   x = TileX(end_tile);
    00232   y = TileY(end_tile);
    00233   sx = TileX(p1);
    00234   sy = TileY(p1);
    00235
    00236   /* check if valid, and make sure that (x,y) are smaller than (sx,sy) */
    00237   if (x == sx) {
    00238     if (y == sy) return_cmd_error(STR_5008_CANNOT_START_AND_END_ON);
    00239     direction = AXIS_Y;
    00240     if (y > sy) Swap(y, sy);
    00241   } else if (y == sy) {
    00242     direction = AXIS_X;
    00243     if (x > sx) Swap(x, sx);
    00244   } else {
    00245     return_cmd_error(STR_500A_START_AND_END_MUST_BE_IN);
    00246   }
    00247
    00248   /* set and test bridge length, availability */
    00249   bridge_len = sx + sy - x - y - 1;
    00250   if (!CheckBridge_Stuff(bridge_type, bridge_len, flags)) return_cmd_error(STR_5015_CAN_T_BUILD_BRIDGE_HERE);
    00251
    00252   /* retrieve landscape height and ensure it's on land */
    00253   tile_start = TileXY(x, y);
    00254   tile_end = TileXY(sx, sy);
    00255   if (IsWaterTile(tile_start) || IsWaterTile(tile_end)) {
    00256     return_cmd_error(STR_02A0_ENDS_OF_BRIDGE_MUST_BOTH);
    00257   }
    00258
    00259   tileh_start = GetTileSlope(tile_start, &z_start);
    00260   tileh_end = GetTileSlope(tile_end, &z_end);
    00261
    00262   CommandCost terraform_cost_north = CheckBridgeSlopeNorth(direction, &tileh_start, &z_start);
    00263   CommandCost terraform_cost_south = CheckBridgeSlopeSouth(direction, &tileh_end,   &z_end);
    00264
    00265   if (z_start != z_end) return_cmd_error(STR_BRIDGEHEADS_NOT_SAME_HEIGHT);
    00266
    00267   if (IsBridgeTile(tile_start) && IsBridgeTile(tile_end) &&
    00268       GetOtherBridgeEnd(tile_start) == tile_end &&
    00269       GetTunnelBridgeTransportType(tile_start) == transport_type) {
    00270     /* Replace a current bridge. */
    00271
    00272     /* If this is a railway bridge, make sure the railtypes match. */
    00273     if (transport_type == TRANSPORT_RAIL && GetRailType(tile_start) != railtype) {
    00274       return_cmd_error(STR_5007_MUST_DEMOLISH_BRIDGE_FIRST);
    00275     }
    00276
    00277     /* Do not replace town bridges with lower speed bridges. */
    00278     if (!(flags & DC_QUERY_COST) && IsTileOwner(tile_start, OWNER_TOWN) &&
    00279         GetBridgeSpec(bridge_type)->speed < GetBridgeSpec(GetBridgeType(tile_start))->speed) {
    00280       Town *t = ClosestTownFromTile(tile_start, UINT_MAX);
    00281
    00282       if (t == NULL) {
    00283         return CMD_ERROR;
    00284       } else {
    00285         SetDParam(0, t->index);
    00286         return_cmd_error(STR_2009_LOCAL_AUTHORITY_REFUSES);
    00287       }
    00288     }
    00289
    00290     /* Do not replace the bridge with the same bridge type. */
    00291     if (!(flags & DC_QUERY_COST) && bridge_type == GetBridgeType(tile_start)) {
    00292       return_cmd_error(STR_1007_ALREADY_BUILT);
    00293     }
    00294
    00295     /* Do not allow replacing another player's bridges. */
    00296     if (!IsTileOwner(tile_start, _current_player) && !IsTileOwner(tile_start, OWNER_TOWN)) {
    00297       return_cmd_error(STR_1024_AREA_IS_OWNED_BY_ANOTHER);
    00298     }
    00299
    00300     cost.AddCost((bridge_len + 1) * _price.clear_bridge); // The cost of clearing the current bridge.
    00301     replace_bridge = true;
    00302     replaced_bridge_type = GetBridgeType(tile_start);
    00303
    00304     /* Do not remove road types when upgrading a bridge */
    00305     roadtypes |= GetRoadTypes(tile_start);
    00306   } else {
    00307     /* Build a new bridge. */
    00308
    00309     bool allow_on_slopes = (!_is_old_ai_player && _patches.build_on_slopes);
    00310
    00311     /* Try and clear the start landscape */
    00312     ret = DoCommand(tile_start, 0, 0, flags, CMD_LANDSCAPE_CLEAR);
    00313     if (CmdFailed(ret)) return ret;
    00314     cost = ret;
    00315
    00316     if (CmdFailed(terraform_cost_north) || (terraform_cost_north.GetCost() != 0 && !allow_on_slopes))
    00317       return_cmd_error(STR_1000_LAND_SLOPED_IN_WRONG_DIRECTION);
    00318     cost.AddCost(terraform_cost_north);
    00319
    00320     /* Try and clear the end landscape */
    00321     ret = DoCommand(tile_end, 0, 0, flags, CMD_LANDSCAPE_CLEAR);
    00322     if (CmdFailed(ret)) return ret;
    00323     cost.AddCost(ret);
    00324
    00325     /* false - end tile slope check */
    00326     if (CmdFailed(terraform_cost_south) || (terraform_cost_south.GetCost() != 0 && !allow_on_slopes))
    00327       return_cmd_error(STR_1000_LAND_SLOPED_IN_WRONG_DIRECTION);
    00328     cost.AddCost(terraform_cost_south);
    00329   }
    00330
    00331   if (!replace_bridge) {
    00332     TileIndex Heads[] = {tile_start, tile_end};
    00333     int i;
    00334
    00335     for (i = 0; i < 2; i++) {
    00336       if (MayHaveBridgeAbove(Heads[i])) {
    00337         if (IsBridgeAbove(Heads[i])) {
    00338           TileIndex north_head = GetNorthernBridgeEnd(Heads[i]);
    00339
    00340           if (direction == GetBridgeAxis(Heads[i])) return_cmd_error(STR_5007_MUST_DEMOLISH_BRIDGE_FIRST);
    00341
    00342           if (z_start + TILE_HEIGHT == GetBridgeHeight(north_head)) {
    00343             return_cmd_error(STR_5007_MUST_DEMOLISH_BRIDGE_FIRST);
    00344           }
    00345         }
    00346       }
    00347     }
    00348   }
    00349
    00350   /* do the drill? */
    00351   if (flags & DC_EXEC) {
    00352     DiagDirection dir = AxisToDiagDir(direction);
    00353     Owner owner = (replace_bridge && IsTileOwner(tile_start, OWNER_TOWN)) ? OWNER_TOWN : _current_player;
    00354
    00355     switch (transport_type) {
    00356       case TRANSPORT_RAIL:
    00357         MakeRailBridgeRamp(tile_start, owner, bridge_type, dir,                 railtype);
    00358         MakeRailBridgeRamp(tile_end,   owner, bridge_type, ReverseDiagDir(dir), railtype);
    00359         break;
    00360
    00361       case TRANSPORT_ROAD:
    00362         MakeRoadBridgeRamp(tile_start, owner, bridge_type, dir,                 roadtypes);
    00363         MakeRoadBridgeRamp(tile_end,   owner, bridge_type, ReverseDiagDir(dir), roadtypes);
    00364         break;
    00365
    00366       default:
    00367         NOT_REACHED();
    00368         break;
    00369     }
    00370     MarkTileDirtyByTile(tile_start);
    00371     MarkTileDirtyByTile(tile_end);
    00372   }
    00373
    00374   delta = (direction == AXIS_X ? TileDiffXY(1, 0) : TileDiffXY(0, 1));
    00375   for (tile = tile_start + delta; tile != tile_end; tile += delta) {
    00376     if (GetTileMaxZ(tile) > z_start) return_cmd_error(STR_BRIDGE_TOO_LOW_FOR_TERRAIN);
    00377
    00378     if (MayHaveBridgeAbove(tile) && IsBridgeAbove(tile) && !replace_bridge) {
    00379       /* Disallow crossing bridges for the time being */
    00380       return_cmd_error(STR_5007_MUST_DEMOLISH_BRIDGE_FIRST);
    00381     }
    00382
    00383     switch (GetTileType(tile)) {
    00384       case MP_WATER:
    00385         if (!EnsureNoVehicleOnGround(tile)) return_cmd_error(STR_980E_SHIP_IN_THE_WAY);
    00386         if (!IsWater(tile) && !IsCoast(tile)) goto not_valid_below;
    00387         break;
    00388
    00389       case MP_RAILWAY:
    00390         if (!IsPlainRailTile(tile)) goto not_valid_below;
    00391         break;
    00392
    00393       case MP_ROAD:
    00394         if (IsRoadDepot(tile)) goto not_valid_below;
    00395         break;
    00396
    00397       case MP_TUNNELBRIDGE:
    00398         if (IsTunnel(tile)) break;
    00399         if (replace_bridge) break;
    00400         if (direction == DiagDirToAxis(GetTunnelBridgeDirection(tile))) goto not_valid_below;
    00401         if (z_start < GetBridgeHeight(tile)) goto not_valid_below;
    00402         break;
    00403
    00404       case MP_UNMOVABLE:
    00405         if (!IsOwnedLand(tile)) goto not_valid_below;
    00406         break;
    00407
    00408       case MP_CLEAR:
    00409         break;
    00410
    00411       default:
    00412 not_valid_below:;
    00413         /* try and clear the middle landscape */
    00414         ret = DoCommand(tile, 0, 0, flags, CMD_LANDSCAPE_CLEAR);
    00415         if (CmdFailed(ret)) return ret;
    00416         cost.AddCost(ret);
    00417         break;
    00418     }
    00419
    00420     if (flags & DC_EXEC) {
    00421       SetBridgeMiddle(tile, direction);
    00422       MarkTileDirtyByTile(tile);
    00423     }
    00424   }
    00425
    00426   if (flags & DC_EXEC && transport_type == TRANSPORT_RAIL) {
    00427     Track track = AxisToTrack(direction);
    00428     AddSideToSignalBuffer(tile_start, INVALID_DIAGDIR, _current_player);
    00429     YapfNotifyTrackLayoutChange(tile_start, track);
    00430   }
    00431
    00432   /* for human player that builds the bridge he gets a selection to choose from bridges (DC_QUERY_COST)
    00433    * It's unnecessary to execute this command every time for every bridge. So it is done only
    00434    * and cost is computed in "bridge_gui.c". For AI, Towns this has to be of course calculated
    00435    */
    00436   if (!(flags & DC_QUERY_COST) || (IsValidPlayer(_current_player) && GetPlayer(_current_player)->is_ai)) {
    00437     bridge_len += 2; // begin and end tiles/ramps
    00438
    00439     if (IsValidPlayer(_current_player) && !_is_old_ai_player)
    00440       bridge_len = CalcBridgeLenCostFactor(bridge_len);
    00441
    00442     cost.AddCost((int64)bridge_len * _price.build_bridge * GetBridgeSpec(bridge_type)->price >> 8);
    00443   }
    00444
    00445   return cost;
    00446 }
    00447
    00448
    00455 CommandCost CmdBuildTunnel(TileIndex start_tile, uint32 flags, uint32 p1, uint32 p2)
    00456 {
    00457   TileIndexDiff delta;
    00458   TileIndex end_tile;
    00459   DiagDirection direction;
    00460   Slope start_tileh;
    00461   Slope end_tileh;
    00462   TransportType transport_type = (TransportType)GB(p1, 9, 1);
    00463   uint start_z;
    00464   uint end_z;
    00465   CommandCost cost(EXPENSES_CONSTRUCTION);
    00466   CommandCost ret;
    00467
    00468   _build_tunnel_endtile = 0;
    00469   if (transport_type == TRANSPORT_RAIL) {
    00470     if (!ValParamRailtype((RailType)p1)) return CMD_ERROR;
    00471   } else {
    00472     const RoadTypes rts = (RoadTypes)GB(p1, 0, 3);
    00473     if (!AreValidRoadTypes(rts) || !HasRoadTypesAvail(_current_player, rts)) return CMD_ERROR;
    00474   }
    00475
    00476   start_tileh = GetTileSlope(start_tile, &start_z);
    00477   direction = GetInclinedSlopeDirection(start_tileh);
    00478   if (direction == INVALID_DIAGDIR) return_cmd_error(STR_500B_SITE_UNSUITABLE_FOR_TUNNEL);
    00479
    00480   if (IsWaterTile(start_tile)) return_cmd_error(STR_3807_CAN_T_BUILD_ON_WATER);
    00481
    00482   ret = DoCommand(start_tile, 0, 0, flags, CMD_LANDSCAPE_CLEAR);
    00483   if (CmdFailed(ret)) return ret;
    00484
    00485   /* XXX - do NOT change 'ret' in the loop, as it is used as the price
    00486    * for the clearing of the entrance of the tunnel. Assigning it to
    00487    * cost before the loop will yield different costs depending on start-
    00488    * position, because of increased-cost-by-length: 'cost += cost >> 3' */
    00489
    00490   delta = TileOffsByDiagDir(direction);
    00491   DiagDirection tunnel_in_way_dir;
    00492   if (OtherAxis(DiagDirToAxis(direction)) == AXIS_X) {
    00493     tunnel_in_way_dir = (TileX(start_tile) < (MapMaxX() / 2)) ? DIAGDIR_SW : DIAGDIR_NE;
    00494   } else {
    00495     tunnel_in_way_dir = (TileY(start_tile) < (MapMaxX() / 2)) ? DIAGDIR_SE : DIAGDIR_NW;
    00496   }
    00497
    00498   end_tile = start_tile;
    00499
    00501   int tiles_coef = 3;
    00503   int tiles = 0;
    00505   int tiles_bump = 25;
    00506
    00507   for (;;) {
    00508     end_tile += delta;
    00509     end_tileh = GetTileSlope(end_tile, &end_z);
    00510
    00511     if (start_z == end_z) break;
    00512
    00513     if (!_cheats.crossing_tunnels.value && IsTunnelInWayDir(end_tile, start_z, tunnel_in_way_dir)) {
    00514       return_cmd_error(STR_5003_ANOTHER_TUNNEL_IN_THE_WAY);
    00515     }
    00516
    00517     tiles++;
    00518     if (tiles == tiles_bump) {
    00519       tiles_coef++;
    00520       tiles_bump *= 2;
    00521     }
    00522
    00523     cost.AddCost(_price.build_tunnel);
    00524     cost.AddCost(cost.GetCost() >> tiles_coef); // add a multiplier for longer tunnels
    00525   }
    00526
    00527   /* Add the cost of the entrance */
    00528   cost.AddCost(_price.build_tunnel);
    00529   cost.AddCost(ret);
    00530
    00531   /* if the command fails from here on we want the end tile to be highlighted */
    00532   _build_tunnel_endtile = end_tile;
    00533
    00534   if (IsWaterTile(end_tile)) return_cmd_error(STR_3807_CAN_T_BUILD_ON_WATER);
    00535
    00536   /* slope of end tile must be complementary to the slope of the start tile */
    00537   if (end_tileh != ComplementSlope(start_tileh)) {
    00538     /* Check if there is a structure on the terraformed tile. Do not add the cost, that will be done by the terraforming */
    00539     ret = DoCommand(end_tile, 0, 0, DC_AUTO, CMD_LANDSCAPE_CLEAR);
    00540     if (CmdFailed(ret)) return_cmd_error(STR_5005_UNABLE_TO_EXCAVATE_LAND);
    00541
    00542     ret = DoCommand(end_tile, end_tileh & start_tileh, 0, flags, CMD_TERRAFORM_LAND);
    00543     if (CmdFailed(ret)) return_cmd_error(STR_5005_UNABLE_TO_EXCAVATE_LAND);
    00544   } else {
    00545     ret = DoCommand(end_tile, 0, 0, flags, CMD_LANDSCAPE_CLEAR);
    00546     if (CmdFailed(ret)) return ret;
    00547   }
    00548   cost.AddCost(_price.build_tunnel);
    00549   cost.AddCost(ret);
    00550
    00551   if (flags & DC_EXEC) {
    00552     if (transport_type == TRANSPORT_RAIL) {
    00553       MakeRailTunnel(start_tile, _current_player, direction,                 (RailType)GB(p1, 0, 4));
    00554       MakeRailTunnel(end_tile,   _current_player, ReverseDiagDir(direction), (RailType)GB(p1, 0, 4));
    00555       AddSideToSignalBuffer(start_tile, INVALID_DIAGDIR, _current_player);
    00556       YapfNotifyTrackLayoutChange(start_tile, AxisToTrack(DiagDirToAxis(direction)));
    00557     } else {
    00558       MakeRoadTunnel(start_tile, _current_player, direction,                 (RoadTypes)GB(p1, 0, 3));
    00559       MakeRoadTunnel(end_tile,   _current_player, ReverseDiagDir(direction), (RoadTypes)GB(p1, 0, 3));
    00560     }
    00561   }
    00562
    00563   return cost;
    00564 }
    00565
    00566
    00567 static inline bool CheckAllowRemoveTunnelBridge(TileIndex tile)
    00568 {
    00569   /* Floods can remove anything as well as the scenario editor */
    00570   if (_current_player == OWNER_WATER || _game_mode == GM_EDITOR) return true;
    00571   /* Obviously if the bridge/tunnel belongs to us, or no-one, we can remove it */
    00572   if (CheckTileOwnership(tile) || IsTileOwner(tile, OWNER_NONE)) return true;
    00573   /* Otherwise we can only remove town-owned stuff with extra patch-settings, or cheat */
    00574   if (IsTileOwner(tile, OWNER_TOWN) && (_patches.extra_dynamite || _cheats.magic_bulldozer.value)) return true;
    00575   return false;
    00576 }
    00577
    00578 static CommandCost DoClearTunnel(TileIndex tile, uint32 flags)
    00579 {
    00580   Town *t = NULL;
    00581   TileIndex endtile;
    00582
    00583   if (!CheckAllowRemoveTunnelBridge(tile)) return CMD_ERROR;
    00584
    00585   endtile = GetOtherTunnelEnd(tile);
    00586
    00587   if (HasVehicleOnTunnelBridge(tile, endtile)) return CMD_ERROR;
    00588
    00589   _build_tunnel_endtile = endtile;
    00590
    00591   if (IsTileOwner(tile, OWNER_TOWN) && _game_mode != GM_EDITOR) {
    00592     t = ClosestTownFromTile(tile, (uint)-1); // town penalty rating
    00593
    00594     /* Check if you are allowed to remove the tunnel owned by a town
    00595      * Removal depends on difficulty settings */
    00596     if (!CheckforTownRating(flags, t, TUNNELBRIDGE_REMOVE)) {
    00597       SetDParam(0, t->index);
    00598       return_cmd_error(STR_2009_LOCAL_AUTHORITY_REFUSES);
    00599     }
    00600   }
    00601
    00602   /* checks if the owner is town then decrease town rating by RATING_TUNNEL_BRIDGE_DOWN_STEP until
    00603    * you have a "Poor" (0) town rating */
    00604   if (IsTileOwner(tile, OWNER_TOWN) && _game_mode != GM_EDITOR) {
    00605     ChangeTownRating(t, RATING_TUNNEL_BRIDGE_DOWN_STEP, RATING_TUNNEL_BRIDGE_MINIMUM);
    00606   }
    00607
    00608   if (flags & DC_EXEC) {
    00609     if (GetTunnelBridgeTransportType(tile) == TRANSPORT_RAIL) {
    00610       /* We first need to request values before calling DoClearSquare */
    00611       DiagDirection dir = GetTunnelBridgeDirection(tile);
    00612       Owner owner = GetTileOwner(tile);
    00613
    00614       DoClearSquare(tile);
    00615       DoClearSquare(endtile);
    00616
    00617       /* cannot use INVALID_DIAGDIR for signal update because the tunnel doesn't exist anymore */
    00618       AddSideToSignalBuffer(tile,    ReverseDiagDir(dir), owner);
    00619       AddSideToSignalBuffer(endtile, dir,                 owner);
    00620
    00621       Track track = AxisToTrack(DiagDirToAxis(dir));
    00622       YapfNotifyTrackLayoutChange(tile,    track);
    00623       YapfNotifyTrackLayoutChange(endtile, track);
    00624     } else {
    00625       DoClearSquare(tile);
    00626       DoClearSquare(endtile);
    00627     }
    00628   }
    00629   return CommandCost(EXPENSES_CONSTRUCTION, _price.clear_tunnel * (GetTunnelBridgeLength(tile, endtile) + 2));
    00630 }
    00631
    00632
    00633 static CommandCost DoClearBridge(TileIndex tile, uint32 flags)
    00634 {
    00635   DiagDirection direction;
    00636   TileIndexDiff delta;
    00637   TileIndex endtile;
    00638   Town *t = NULL;
    00639
    00640   if (!CheckAllowRemoveTunnelBridge(tile)) return CMD_ERROR;
    00641
    00642   endtile = GetOtherBridgeEnd(tile);
    00643
    00644   if (HasVehicleOnTunnelBridge(tile, endtile)) return CMD_ERROR;
    00645
    00646   direction = GetTunnelBridgeDirection(tile);
    00647   delta = TileOffsByDiagDir(direction);
    00648
    00649   if (IsTileOwner(tile, OWNER_TOWN) && _game_mode != GM_EDITOR) {
    00650     t = ClosestTownFromTile(tile, (uint)-1); // town penalty rating
    00651
    00652     /* Check if you are allowed to remove the bridge owned by a town
    00653      * Removal depends on difficulty settings */
    00654     if (!CheckforTownRating(flags, t, TUNNELBRIDGE_REMOVE)) {
    00655       SetDParam(0, t->index);
    00656       return_cmd_error(STR_2009_LOCAL_AUTHORITY_REFUSES);
    00657     }
    00658   }
    00659
    00660   /* checks if the owner is town then decrease town rating by RATING_TUNNEL_BRIDGE_DOWN_STEP until
    00661    * you have a "Poor" (0) town rating */
    00662   if (IsTileOwner(tile, OWNER_TOWN) && _game_mode != GM_EDITOR) {
    00663     ChangeTownRating(t, RATING_TUNNEL_BRIDGE_DOWN_STEP, RATING_TUNNEL_BRIDGE_MINIMUM);
    00664   }
    00665
    00666   if (flags & DC_EXEC) {
    00667     /* read this value before actual removal of bridge */
    00668     bool rail = GetTunnelBridgeTransportType(tile) == TRANSPORT_RAIL;
    00669     Owner owner = GetTileOwner(tile);
    00670     uint height = GetBridgeHeight(tile);
    00671
    00672     DoClearSquare(tile);
    00673     DoClearSquare(endtile);
    00674     for (TileIndex c = tile + delta; c != endtile; c += delta) {
    00675       /* do not let trees appear from 'nowhere' after removing bridge */
    00676       if (IsNormalRoadTile(c) && GetRoadside(c) == ROADSIDE_TREES) {
    00677         uint minz = GetTileMaxZ(c) + 3 * TILE_HEIGHT;
    00678         if (height < minz) SetRoadside(c, ROADSIDE_PAVED);
    00679       }
    00680       ClearBridgeMiddle(c);
    00681       MarkTileDirtyByTile(c);
    00682     }
    00683
    00684     if (rail) {
    00685       /* cannot use INVALID_DIAGDIR for signal update because the bridge doesn't exist anymore */
    00686       AddSideToSignalBuffer(tile,    ReverseDiagDir(direction), owner);
    00687       AddSideToSignalBuffer(endtile, direction,                 owner);
    00688
    00689       Track track = AxisToTrack(DiagDirToAxis(direction));
    00690       YapfNotifyTrackLayoutChange(tile,    track);
    00691       YapfNotifyTrackLayoutChange(endtile, track);
    00692     }
    00693   }
    00694
    00695   return CommandCost(EXPENSES_CONSTRUCTION, (GetTunnelBridgeLength(tile, endtile) + 2) * _price.clear_bridge);
    00696 }
    00697
    00698 static CommandCost ClearTile_TunnelBridge(TileIndex tile, byte flags)
    00699 {
    00700   if (IsTunnel(tile)) {
    00701     if (flags & DC_AUTO) return_cmd_error(STR_5006_MUST_DEMOLISH_TUNNEL_FIRST);
    00702     return DoClearTunnel(tile, flags);
    00703   } else { // IsBridge(tile)
    00704     if (flags & DC_AUTO) return_cmd_error(STR_5007_MUST_DEMOLISH_BRIDGE_FIRST);
    00705     return DoClearBridge(tile, flags);
    00706   }
    00707
    00708   return CMD_ERROR;
    00709 }
    00710
    00722 static void DrawBridgePillars(const PalSpriteID *psid, const TileInfo* ti, Axis axis, BridgeType type, int x, int y, int z_bridge)
    00723 {
    00724   SpriteID image = psid->sprite;
    00725   if (image != 0) {
    00726     bool drawfarpillar = !HasBit(GetBridgeSpec(type)->flags, 0);
    00727
    00728     /* "side" specifies the side the pillars stand on.
    00729      * The length of the pillars is then set to the height of the bridge over the corners of this edge.
    00730      *
    00731      *                axis==AXIS_X  axis==AXIS_Y
    00732      *   side==false      SW            NW
    00733      *   side==true       NE            SE
    00734      *
    00735      * I have no clue, why this was done this way.
    00736      */
    00737     bool side = HasBit(image, 0);
    00738
    00739     /* "dir" means the edge the pillars stand on */
    00740     DiagDirection dir = AxisToDiagDir(axis);
    00741     if (side != (axis == AXIS_Y)) dir = ReverseDiagDir(dir);
    00742
    00743     /* Determine ground height under pillars */
    00744     int front_height = ti->z;
    00745     int back_height = ti->z;
    00746     GetSlopeZOnEdge(ti->tileh, dir, &front_height, &back_height);
    00747
    00748     /* x and y size of bounding-box of pillars */
    00749     int w = (axis == AXIS_X ? 16 : 2);
    00750     int h = (axis == AXIS_X ? 2 : 16);
    00751     /* sprite position of back facing pillar */
    00752     int x_back = x - (axis == AXIS_X ? 0 : 9);
    00753     int y_back = y - (axis == AXIS_X ? 9 : 0);
    00754
    00755     for (int cur_z = z_bridge; cur_z >= front_height || cur_z >= back_height; cur_z -= TILE_HEIGHT) {
    00756       /* Draw front facing pillar */
    00757       if (cur_z >= front_height) {
    00758         AddSortableSpriteToDraw(image, psid->pal, x, y, w, h, BB_HEIGHT_UNDER_BRIDGE - 5, cur_z, IsTransparencySet(TO_BRIDGES), 0, 0, -5);
    00759       }
    00760
    00761       /* Draw back facing pillar, but not the highest part directly under the bridge-floor */
    00762       if (drawfarpillar && cur_z >= back_height && cur_z < z_bridge - TILE_HEIGHT) {
    00763         AddSortableSpriteToDraw(image, psid->pal, x_back, y_back, w, h, BB_HEIGHT_UNDER_BRIDGE - 5, cur_z, IsTransparencySet(TO_BRIDGES), 0, 0, -5);
    00764       }
    00765     }
    00766   }
    00767 }
    00768
    00777 static void DrawBridgeTramBits(int x, int y, byte z, int offset, bool overlay)
    00778 {
    00779   static const SpriteID tram_offsets[2][6] = { { 107, 108, 109, 110, 111, 112 }, { 4, 5, 15, 16, 17, 18 } };
    00780   static const SpriteID back_offsets[6]    =   {  95,  96,  99, 102, 100, 101 };
    00781   static const SpriteID front_offsets[6]   =   {  97,  98, 103, 106, 104, 105 };
    00782
    00783   static const uint size_x[6] = {  1, 16, 16,  1, 16,  1 };
    00784   static const uint size_y[6] = { 16,  1,  1, 16,  1, 16 };
    00785   static const uint front_bb_offset_x[6] = { 15,  0,  0, 15,  0, 15 };
    00786   static const uint front_bb_offset_y[6] = {  0, 15, 15,  0, 15,  0 };
    00787
    00788   /* The sprites under the vehicles are drawn as SpriteCombine. StartSpriteCombine() has already been called
    00789    * The bounding boxes here are the same as for bridge front/roof */
    00790   AddSortableSpriteToDraw(SPR_TRAMWAY_BASE + tram_offsets[overlay][offset], PAL_NONE, x, y, size_x[offset], size_y[offset], 0x28, z, IsTransparencySet(TO_BRIDGES));
    00791
    00792   AddSortableSpriteToDraw(SPR_TRAMWAY_BASE + back_offsets[offset],  PAL_NONE, x, y, size_x[offset], size_y[offset], 0x28, z, IsTransparencySet(TO_CATENARY));
    00793
    00794   /* Start a new SpriteCombine for the front part */
    00795   EndSpriteCombine();
    00796   StartSpriteCombine();
    00797
    00798   /* For sloped sprites the bounding box needs to be higher, as the pylons stop on a higher point */
    00799   AddSortableSpriteToDraw(SPR_TRAMWAY_BASE + front_offsets[offset], PAL_NONE, x, y, size_x[offset] + front_bb_offset_x[offset], size_y[offset] + front_bb_offset_y[offset], 0x28, z, IsTransparencySet(TO_CATENARY), front_bb_offset_x[offset], front_bb_offset_y[offset]);
    00800 }
    00801
    00815 static void DrawTile_TunnelBridge(TileInfo *ti)
    00816 {
    00817   SpriteID image;
    00818   TransportType transport_type = GetTunnelBridgeTransportType(ti->tile);
    00819   DiagDirection tunnelbridge_direction = GetTunnelBridgeDirection(ti->tile);
    00820
    00821   if (IsTunnel(ti->tile)) {
    00822     /* Front view of tunnel bounding boxes:
    00823      *
    00824      *   122223  <- BB_Z_SEPARATOR
    00825      *   1    3
    00826      *   1    3                1,3 = empty helper BB
    00827      *   1    3                  2 = SpriteCombine of tunnel-roof and catenary (tram & elrail)
    00828      *
    00829      */
    00830
    00831     static const int _tunnel_BB[4][12] = {
    00832       /*  tunnnel-roof  |  Z-separator  | tram-catenary
    00833        * w  h  bb_x bb_y| x   y   w   h |bb_x bb_y w h */
    00834       {  1,  0, -15, -14,  0, 15, 16,  1, 0, 1, 16, 15 }, // NE
    00835       {  0,  1, -14, -15, 15,  0,  1, 16, 1, 0, 15, 16 }, // SE
    00836       {  1,  0, -15, -14,  0, 15, 16,  1, 0, 1, 16, 15 }, // SW
    00837       {  0,  1, -14, -15, 15,  0,  1, 16, 1, 0, 15, 16 }, // NW
    00838     };
    00839     const int *BB_data = _tunnel_BB[tunnelbridge_direction];
    00840
    00841     bool catenary = false;
    00842
    00843     if (transport_type == TRANSPORT_RAIL) {
    00844       image = GetRailTypeInfo(GetRailType(ti->tile))->base_sprites.tunnel;
    00845     } else {
    00846       image = SPR_TUNNEL_ENTRY_REAR_ROAD;
    00847     }
    00848
    00849     if (HasTunnelBridgeSnowOrDesert(ti->tile)) image += 32;
    00850
    00851     image += tunnelbridge_direction * 2;
    00852     DrawGroundSprite(image, PAL_NONE);
    00853     if (transport_type == TRANSPORT_ROAD) {
    00854       RoadTypes rts = GetRoadTypes(ti->tile);
    00855
    00856       if (HasBit(rts, ROADTYPE_TRAM)) {
    00857         static const SpriteID tunnel_sprites[2][4] = { { 28, 78, 79, 27 }, {  5, 76, 77,  4 } };
    00858
    00859         DrawGroundSprite(SPR_TRAMWAY_BASE + tunnel_sprites[rts - ROADTYPES_TRAM][tunnelbridge_direction], PAL_NONE);
    00860
    00861         catenary = true;
    00862         StartSpriteCombine();
    00863         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);
    00864       }
    00865     } else if (GetRailType(ti->tile) == RAILTYPE_ELECTRIC) {
    00866       DrawCatenary(ti);
    00867
    00868       catenary = true;
    00869       StartSpriteCombine();
    00870       DrawCatenaryOnTunnel(ti);
    00871     }
    00872
    00873     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);
    00874
    00875     if (catenary) EndSpriteCombine();
    00876
    00877     /* Add helper BB for sprite sorting, that separate the tunnel from things beside of it */
    00878     AddSortableSpriteToDraw(SPR_EMPTY_BOUNDING_BOX, PAL_NONE, ti->x             , ti->y             , BB_data[6], BB_data[7], TILE_HEIGHT, ti->z);
    00879     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);
    00880
    00881     DrawBridgeMiddle(ti);
    00882   } else { // IsBridge(ti->tile)
    00883     const PalSpriteID *psid;
    00884     int base_offset;
    00885     bool ice = HasTunnelBridgeSnowOrDesert(ti->tile);
    00886
    00887     if (transport_type == TRANSPORT_RAIL) {
    00888       base_offset = GetRailTypeInfo(GetRailType(ti->tile))->bridge_offset;
    00889       assert(base_offset != 8); // This one is used for roads
    00890     } else {
    00891       base_offset = 8;
    00892     }
    00893
    00894     /* as the lower 3 bits are used for other stuff, make sure they are clear */
    00895     assert( (base_offset & 0x07) == 0x00);
    00896
    00897     DrawFoundation(ti, GetBridgeFoundation(ti->tileh, DiagDirToAxis(tunnelbridge_direction)));
    00898
    00899     /* HACK Wizardry to convert the bridge ramp direction into a sprite offset */
    00900     base_offset += (6 - tunnelbridge_direction) % 4;
    00901
    00902     if (ti->tileh == SLOPE_FLAT) base_offset += 4; // sloped bridge head
    00903
    00904     /* Table number 6 always refers to the bridge heads for any bridge type */
    00905     psid = &GetBridgeSpriteTable(GetBridgeType(ti->tile), 6)[base_offset];
    00906
    00907     if (!ice) {
    00908       DrawClearLandTile(ti, 3);
    00909     } else {
    00910       DrawGroundSprite(SPR_FLAT_SNOWY_TILE + _tileh_to_sprite[ti->tileh], PAL_NONE);
    00911     }
    00912
    00913     /* draw ramp */
    00914
    00915     /* Draw Trambits as SpriteCombine */
    00916     if (transport_type == TRANSPORT_ROAD) StartSpriteCombine();
    00917
    00918     /* HACK set the height of the BB of a sloped ramp to 1 so a vehicle on
    00919      * it doesn't disappear behind it
    00920      */
    00921     AddSortableSpriteToDraw(
    00922       psid->sprite, psid->pal, ti->x, ti->y, 16, 16, ti->tileh == SLOPE_FLAT ? 0 : 8, ti->z, IsTransparencySet(TO_BRIDGES)
    00923     );
    00924
    00925     if (transport_type == TRANSPORT_ROAD) {
    00926       RoadTypes rts = GetRoadTypes(ti->tile);
    00927
    00928       if (HasBit(rts, ROADTYPE_TRAM)) {
    00929         uint offset = tunnelbridge_direction;
    00930         uint z = ti->z;
    00931         if (ti->tileh != SLOPE_FLAT) {
    00932           offset = (offset + 1) & 1;
    00933           z += TILE_HEIGHT;
    00934         } else {
    00935           offset += 2;
    00936         }
    00937         /* DrawBridgeTramBits() calls EndSpriteCombine() and StartSpriteCombine() */
    00938         DrawBridgeTramBits(ti->x, ti->y, z, offset, HasBit(rts, ROADTYPE_ROAD));
    00939       }
    00940       EndSpriteCombine();
    00941     } else if (GetRailType(ti->tile) == RAILTYPE_ELECTRIC) {
    00942       DrawCatenary(ti);
    00943     }
    00944
    00945     DrawBridgeMiddle(ti);
    00946   }
    00947 }
    00948
    00949
    00966 static uint CalcBridgePiece(uint north, uint south)
    00967 {
    00968   if (north == 1) {
    00969     return 0;
    00970   } else if (south == 1) {
    00971     return 1;
    00972   } else if (north < south) {
    00973     return north & 1 ? 3 : 2;
    00974   } else if (north > south) {
    00975     return south & 1 ? 2 : 3;
    00976   } else {
    00977     return north & 1 ? 5 : 4;
    00978   }
    00979 }
    00980
    00981
    00982 void DrawBridgeMiddle(const TileInfo* ti)
    00983 {
    00984   /* Sectional view of bridge bounding boxes:
    00985    *
    00986    *  1           2                                1,2 = SpriteCombine of Bridge front/(back&floor) and TramCatenary
    00987    *  1           2                                  3 = empty helper BB
    00988    *  1     7     2                                4,5 = pillars under higher bridges
    00989    *  1 6 88888 6 2                                  6 = elrail-pylons
    00990    *  1 6 88888 6 2                                  7 = elrail-wire
    00991    *  1 6 88888 6 2  <- TILE_HEIGHT                  8 = rail-vehicle on bridge
    00992    *  3333333333333  <- BB_Z_SEPARATOR
    00993    *                 <- unused
    00994    *    4       5    <- BB_HEIGHT_UNDER_BRIDGE
    00995    *    4       5
    00996    *    4       5
    00997    *
    00998    */
    00999
    01000   /* Z position of the bridge sprites relative to bridge height (downwards) */
    01001   static const int BRIDGE_Z_START = 3;
    01002
    01003   const PalSpriteID* psid;
    01004   uint base_offset;
    01005   TileIndex rampnorth;
    01006   TileIndex rampsouth;
    01007   TransportType transport_type;
    01008   Axis axis;
    01009   uint piece;
    01010   BridgeType type;
    01011   int x;
    01012   int y;
    01013   uint z;
    01014
    01015   if (!IsBridgeAbove(ti->tile)) return;
    01016
    01017   rampnorth = GetNorthernBridgeEnd(ti->tile);
    01018   rampsouth = GetSouthernBridgeEnd(ti->tile);
    01019   transport_type = GetTunnelBridgeTransportType(rampsouth);
    01020
    01021   axis = GetBridgeAxis(ti->tile);
    01022   piece = CalcBridgePiece(
    01023     GetTunnelBridgeLength(ti->tile, rampnorth) + 1,
    01024     GetTunnelBridgeLength(ti->tile, rampsouth) + 1
    01025   );
    01026   type = GetBridgeType(rampsouth);
    01027
    01028   if (transport_type == TRANSPORT_RAIL) {
    01029     base_offset = GetRailTypeInfo(GetRailType(rampsouth))->bridge_offset;
    01030   } else {
    01031     base_offset = 8;
    01032   }
    01033
    01034   psid = base_offset + GetBridgeSpriteTable(type, piece);
    01035   if (axis != AXIS_X) psid += 4;
    01036
    01037   x = ti->x;
    01038   y = ti->y;
    01039   uint bridge_z = GetBridgeHeight(rampsouth);
    01040   z = bridge_z - BRIDGE_Z_START;
    01041
    01042   /* Add a bounding box, that separates the bridge from things below it. */
    01043   AddSortableSpriteToDraw(SPR_EMPTY_BOUNDING_BOX, PAL_NONE, x, y, 16, 16, 1, bridge_z - TILE_HEIGHT + BB_Z_SEPARATOR);
    01044
    01045   /* Draw Trambits as SpriteCombine */
    01046   if (transport_type == TRANSPORT_ROAD) StartSpriteCombine();
    01047
    01048   /* Draw floor and far part of bridge*/
    01049   if (axis == AXIS_X) {
    01050     AddSortableSpriteToDraw(psid->sprite, psid->pal, x, y, 16, 1, 0x28, z, IsTransparencySet(TO_BRIDGES), 0, 0, BRIDGE_Z_START);
    01051   } else {
    01052     AddSortableSpriteToDraw(psid->sprite, psid->pal, x, y, 1, 16, 0x28, z, IsTransparencySet(TO_BRIDGES), 0, 0, BRIDGE_Z_START);
    01053   }
    01054
    01055   psid++;
    01056
    01057   if (transport_type == TRANSPORT_ROAD) {
    01058     RoadTypes rts = GetRoadTypes(rampsouth);
    01059
    01060     if (HasBit(rts, ROADTYPE_TRAM)) {
    01061       /* DrawBridgeTramBits() calls EndSpriteCombine() and StartSpriteCombine() */
    01062       DrawBridgeTramBits(x, y, bridge_z, axis ^ 1, HasBit(rts, ROADTYPE_ROAD));
    01063     } else {
    01064       EndSpriteCombine();
    01065       StartSpriteCombine();
    01066     }
    01067   } else if (GetRailType(rampsouth) == RAILTYPE_ELECTRIC) {
    01068     DrawCatenary(ti);
    01069   }
    01070
    01071   /* draw roof, the component of the bridge which is logically between the vehicle and the camera */
    01072   if (axis == AXIS_X) {
    01073     y += 12;
    01074     if (psid->sprite & SPRITE_MASK) AddSortableSpriteToDraw(psid->sprite, psid->pal, x, y, 16, 4, 0x28, z, IsTransparencySet(TO_BRIDGES), 0, 3, BRIDGE_Z_START);
    01075   } else {
    01076     x += 12;
    01077     if (psid->sprite & SPRITE_MASK) AddSortableSpriteToDraw(psid->sprite, psid->pal, x, y, 4, 16, 0x28, z, IsTransparencySet(TO_BRIDGES), 3, 0, BRIDGE_Z_START);
    01078   }
    01079
    01080   /* Draw TramFront as SpriteCombine */
    01081   if (transport_type == TRANSPORT_ROAD) EndSpriteCombine();
    01082
    01083   psid++;
    01084   if (ti->z + 5 == z) {
    01085     /* draw poles below for small bridges */
    01086     if (psid->sprite != 0) {
    01087       SpriteID image = psid->sprite;
    01088       SpriteID pal   = psid->pal;
    01089       if (IsTransparencySet(TO_BRIDGES)) {
    01090         SetBit(image, PALETTE_MODIFIER_TRANSPARENT);
    01091         pal = PALETTE_TO_TRANSPARENT;
    01092       }
    01093
    01094       DrawGroundSpriteAt(image, pal, x, y, z);
    01095     }
    01096   } else if (_patches.bridge_pillars) {
    01097     /* draw pillars below for high bridges */
    01098     DrawBridgePillars(psid, ti, axis, type, x, y, z);
    01099   }
    01100 }
    01101
    01102
    01103 static uint GetSlopeZ_TunnelBridge(TileIndex tile, uint x, uint y)
    01104 {
    01105   uint z;
    01106   Slope tileh = GetTileSlope(tile, &z);
    01107
    01108   x &= 0xF;
    01109   y &= 0xF;
    01110
    01111   if (IsTunnel(tile)) {
    01112     uint pos = (DiagDirToAxis(GetTunnelBridgeDirection(tile)) == AXIS_X ? y : x);
    01113
    01114     /* In the tunnel entrance? */
    01115     if (5 <= pos && pos <= 10) return z;
    01116   } else { // IsBridge(tile)
    01117     DiagDirection dir = GetTunnelBridgeDirection(tile);
    01118     uint pos = (DiagDirToAxis(dir) == AXIS_X ? y : x);
    01119
    01120     z += ApplyFoundationToSlope(GetBridgeFoundation(tileh, DiagDirToAxis(dir)), &tileh);
    01121
    01122     /* On the bridge ramp? */
    01123     if (5 <= pos && pos <= 10) {
    01124       uint delta;
    01125
    01126       if (tileh != SLOPE_FLAT) return z + TILE_HEIGHT;
    01127
    01128       switch (dir) {
    01129         default: NOT_REACHED();
    01130         case DIAGDIR_NE: delta = (TILE_SIZE - 1 - x) / 2; break;
    01131         case DIAGDIR_SE: delta = y / 2; break;
    01132         case DIAGDIR_SW: delta = x / 2; break;
    01133         case DIAGDIR_NW: delta = (TILE_SIZE - 1 - y) / 2; break;
    01134       }
    01135       return z + 1 + delta;
    01136     }
    01137   }
    01138
    01139   return z + GetPartialZ(x, y, tileh);
    01140 }
    01141
    01142 static Foundation GetFoundation_TunnelBridge(TileIndex tile, Slope tileh)
    01143 {
    01144   return IsTunnel(tile) ? FOUNDATION_NONE : GetBridgeFoundation(tileh, DiagDirToAxis(GetTunnelBridgeDirection(tile)));
    01145 }
    01146
    01147
    01148 static void GetAcceptedCargo_TunnelBridge(TileIndex tile, AcceptedCargo ac)
    01149 {
    01150   /* not used */
    01151 }
    01152
    01153 static void GetTileDesc_TunnelBridge(TileIndex tile, TileDesc *td)
    01154 {
    01155   if (IsTunnel(tile)) {
    01156     td->str = (GetTunnelBridgeTransportType(tile) == TRANSPORT_RAIL) ?
    01157       STR_5017_RAILROAD_TUNNEL : STR_5018_ROAD_TUNNEL;
    01158   } else { //so it must be a bridge
    01159     td->str = GetBridgeSpec(GetBridgeType(tile))->transport_name[GetTunnelBridgeTransportType(tile)];
    01160   }
    01161   td->owner = GetTileOwner(tile);
    01162 }
    01163
    01164
    01165 static void AnimateTile_TunnelBridge(TileIndex tile)
    01166 {
    01167   /* not used */
    01168 }
    01169
    01170 static void TileLoop_TunnelBridge(TileIndex tile)
    01171 {
    01172   bool snow_or_desert = HasTunnelBridgeSnowOrDesert(tile);
    01173   switch (_opt.landscape) {
    01174     case LT_ARCTIC:
    01175       if (snow_or_desert != (GetTileZ(tile) > GetSnowLine())) {
    01176         SetTunnelBridgeSnowOrDesert(tile, !snow_or_desert);
    01177         MarkTileDirtyByTile(tile);
    01178       }
    01179       break;
    01180
    01181     case LT_TROPIC:
    01182       if (GetTropicZone(tile) == TROPICZONE_DESERT && !snow_or_desert) {
    01183         SetTunnelBridgeSnowOrDesert(tile, true);
    01184         MarkTileDirtyByTile(tile);
    01185       }
    01186       break;
    01187
    01188     default:
    01189       break;
    01190   }
    01191 }
    01192
    01193 static void ClickTile_TunnelBridge(TileIndex tile)
    01194 {
    01195   /* not used */
    01196 }
    01197
    01198
    01199 static TrackStatus GetTileTrackStatus_TunnelBridge(TileIndex tile, TransportType mode, uint sub_mode, DiagDirection side)
    01200 {
    01201   TransportType transport_type = GetTunnelBridgeTransportType(tile);
    01202   if (transport_type != mode || (transport_type == TRANSPORT_ROAD && (GetRoadTypes(tile) & sub_mode) == 0)) return 0;
    01203
    01204   DiagDirection dir = GetTunnelBridgeDirection(tile);
    01205   if (side != INVALID_DIAGDIR && side != ReverseDiagDir(dir)) return 0;
    01206   return CombineTrackStatus(TrackBitsToTrackdirBits(AxisToTrackBits(DiagDirToAxis(dir))), TRACKDIR_BIT_NONE);
    01207 }
    01208
    01209 static void ChangeTileOwner_TunnelBridge(TileIndex tile, PlayerID old_player, PlayerID new_player)
    01210 {
    01211   if (!IsTileOwner(tile, old_player)) return;
    01212
    01213   if (new_player != PLAYER_SPECTATOR) {
    01214     SetTileOwner(tile, new_player);
    01215   } else {
    01216     if (CmdFailed(DoCommand(tile, 0, 0, DC_EXEC | DC_BANKRUPT, CMD_LANDSCAPE_CLEAR))) {
    01217       /* When clearing the bridge/tunnel failed there are still vehicles on/in
    01218        * the bridge/tunnel. As all *our* vehicles are already removed, they
    01219        * must be of another owner. Therefor this must be a road bridge/tunnel.
    01220        * In that case we can safely reassign the ownership to OWNER_NONE. */
    01221       assert(GetTunnelBridgeTransportType(tile) == TRANSPORT_ROAD);
    01222       SetTileOwner(tile, OWNER_NONE);
    01223     }
    01224   }
    01225 }
    01226
    01227
    01228 static const byte _tunnel_fractcoord_1[4]    = {0x8E, 0x18, 0x81, 0xE8};
    01229 static const byte _tunnel_fractcoord_2[4]    = {0x81, 0x98, 0x87, 0x38};
    01230 static const byte _tunnel_fractcoord_3[4]    = {0x82, 0x88, 0x86, 0x48};
    01231 static const byte _exit_tunnel_track[4]      = {1, 2, 1, 2};
    01232
    01234 static const Trackdir _road_exit_tunnel_state[DIAGDIR_END] = {
    01235   TRACKDIR_X_SW, TRACKDIR_Y_NW, TRACKDIR_X_NE, TRACKDIR_Y_SE
    01236 };
    01237 static const byte _road_exit_tunnel_frame[4] = {2, 7, 9, 4};
    01238
    01239 static const byte _tunnel_fractcoord_4[4]    = {0x52, 0x85, 0x98, 0x29};
    01240 static const byte _tunnel_fractcoord_5[4]    = {0x92, 0x89, 0x58, 0x25};
    01241 static const byte _tunnel_fractcoord_6[4]    = {0x92, 0x89, 0x56, 0x45};
    01242 static const byte _tunnel_fractcoord_7[4]    = {0x52, 0x85, 0x96, 0x49};
    01243
    01244 static VehicleEnterTileStatus VehicleEnter_TunnelBridge(Vehicle *v, TileIndex tile, int x, int y)
    01245 {
    01246   int z = GetSlopeZ(x, y) - v->z_pos;
    01247
    01248   if (abs(z) > 2) return VETSB_CANNOT_ENTER;
    01249   const DiagDirection dir = GetTunnelBridgeDirection(tile);
    01250
    01251   if (IsTunnel(tile)) {
    01252     byte fc;
    01253     DiagDirection vdir;
    01254
    01255     if (v->type == VEH_TRAIN) {
    01256       fc = (x & 0xF) + (y << 4);
    01257
    01258       vdir = DirToDiagDir(v->direction);
    01259
    01260       if (v->u.rail.track != TRACK_BIT_WORMHOLE && dir == vdir) {
    01261         if (IsFrontEngine(v) && fc == _tunnel_fractcoord_1[dir]) {
    01262           if (!PlayVehicleSound(v, VSE_TUNNEL) && RailVehInfo(v->engine_type)->engclass == 0) {
    01263             SndPlayVehicleFx(SND_05_TRAIN_THROUGH_TUNNEL, v);
    01264           }
    01265           return VETSB_CONTINUE;
    01266         }
    01267         if (fc == _tunnel_fractcoord_2[dir]) {
    01268           v->tile = tile;
    01269           v->u.rail.track = TRACK_BIT_WORMHOLE;
    01270           v->vehstatus |= VS_HIDDEN;
    01271           return VETSB_ENTERED_WORMHOLE;
    01272         }
    01273       }
    01274
    01275       if (dir == ReverseDiagDir(vdir) && fc == _tunnel_fractcoord_3[dir] && z == 0) {
    01276         /* We're at the tunnel exit ?? */
    01277         v->tile = tile;
    01278         v->u.rail.track = (TrackBits)_exit_tunnel_track[dir];
    01279         assert(v->u.rail.track);
    01280         v->vehstatus &= ~VS_HIDDEN;
    01281         return VETSB_ENTERED_WORMHOLE;
    01282       }
    01283     } else if (v->type == VEH_ROAD) {
    01284       fc = (x & 0xF) + (y << 4);
    01285       vdir = DirToDiagDir(v->direction);
    01286
    01287       /* Enter tunnel? */
    01288       if (v->u.road.state != RVSB_WORMHOLE && dir == vdir) {
    01289         if (fc == _tunnel_fractcoord_4[dir] ||
    01290             fc == _tunnel_fractcoord_5[dir]) {
    01291           v->tile = tile;
    01292           v->u.road.state = RVSB_WORMHOLE;
    01293           v->vehstatus |= VS_HIDDEN;
    01294           return VETSB_ENTERED_WORMHOLE;
    01295         } else {
    01296           return VETSB_CONTINUE;
    01297         }
    01298       }
    01299
    01300       if (dir == ReverseDiagDir(vdir) && (
    01301             /* We're at the tunnel exit ?? */
    01302             fc == _tunnel_fractcoord_6[dir] ||
    01303             fc == _tunnel_fractcoord_7[dir]
    01304           ) &&
    01305           z == 0) {
    01306         v->tile = tile;
    01307         v->u.road.state = _road_exit_tunnel_state[dir];
    01308         v->u.road.frame = _road_exit_tunnel_frame[dir];
    01309         v->vehstatus &= ~VS_HIDDEN;
    01310         return VETSB_ENTERED_WORMHOLE;
    01311       }
    01312     }
    01313   } else { // IsBridge(tile)
    01314
    01315     if (v->IsPrimaryVehicle()) {
    01316       /* modify speed of vehicle */
    01317       uint16 spd = GetBridgeSpec(GetBridgeType(tile))->speed;
    01318
    01319       if (v->type == VEH_ROAD) spd *= 2;
    01320       if (v->cur_speed > spd) v->cur_speed = spd;
    01321     }
    01322
    01323     if (DirToDiagDir(v->direction) == dir) {
    01324       switch (dir) {
    01325         default: NOT_REACHED();
    01326         case DIAGDIR_NE: if ((x & 0xF) != 0)             return VETSB_CONTINUE; break;
    01327         case DIAGDIR_SE: if ((y & 0xF) != TILE_SIZE - 1) return VETSB_CONTINUE; break;
    01328         case DIAGDIR_SW: if ((x & 0xF) != TILE_SIZE - 1) return VETSB_CONTINUE; break;
    01329         case DIAGDIR_NW: if ((y & 0xF) != 0)             return VETSB_CONTINUE; break;
    01330       }
    01331       if (v->type == VEH_TRAIN) {
    01332         v->u.rail.track = TRACK_BIT_WORMHOLE;
    01333         ClrBit(v->u.rail.flags, VRF_GOINGUP);
    01334         ClrBit(v->u.rail.flags, VRF_GOINGDOWN);
    01335       } else {
    01336         v->u.road.state = RVSB_WORMHOLE;
    01337       }
    01338       return VETSB_ENTERED_WORMHOLE;
    01339     } else if (DirToDiagDir(v->direction) == ReverseDiagDir(dir)) {
    01340       v->tile = tile;
    01341       if (v->type == VEH_TRAIN) {
    01342         if (v->u.rail.track == TRACK_BIT_WORMHOLE) {
    01343           v->u.rail.track = (DiagDirToAxis(dir) == AXIS_X ? TRACK_BIT_X : TRACK_BIT_Y);
    01344           return VETSB_ENTERED_WORMHOLE;
    01345         }
    01346       } else {
    01347         if (v->u.road.state == RVSB_WORMHOLE) {
    01348           v->u.road.state = _road_exit_tunnel_state[dir];
    01349           v->u.road.frame = 0;
    01350           return VETSB_ENTERED_WORMHOLE;
    01351         }
    01352       }
    01353       return VETSB_CONTINUE;
    01354     }
    01355   }
    01356   return VETSB_CONTINUE;
    01357 }
    01358
    01359 static CommandCost TerraformTile_TunnelBridge(TileIndex tile, uint32 flags, uint z_new, Slope tileh_new)
    01360 {
    01361   if (_patches.build_on_slopes && AutoslopeEnabled() && IsBridge(tile)) {
    01362     DiagDirection direction = GetTunnelBridgeDirection(tile);
    01363     Axis axis = DiagDirToAxis(direction);
    01364     CommandCost res;
    01365     uint z_old;
    01366     Slope tileh_old = GetTileSlope(tile, &z_old);
    01367
    01368     /* Check if new slope is valid for bridges in general (so we can savely call GetBridgeFoundation()) */
    01369     if ((direction == DIAGDIR_NW) || (direction == DIAGDIR_NE)) {
    01370       CheckBridgeSlopeSouth(axis, &tileh_old, &z_old);
    01371       res = CheckBridgeSlopeSouth(axis, &tileh_new, &z_new);
    01372     } else {
    01373       CheckBridgeSlopeNorth(axis, &tileh_old, &z_old);
    01374       res = CheckBridgeSlopeNorth(axis, &tileh_new, &z_new);
    01375     }
    01376
    01377     /* Surface slope is valid and remains unchanged? */
    01378     if (!CmdFailed(res) && (z_old == z_new) && (tileh_old == tileh_new)) return CommandCost(EXPENSES_CONSTRUCTION, _price.terraform);
    01379   }
    01380
    01381   return DoCommand(tile, 0, 0, flags, CMD_LANDSCAPE_CLEAR);
    01382 }
    01383
    01384 extern const TileTypeProcs _tile_type_tunnelbridge_procs = {
    01385   DrawTile_TunnelBridge,           /* draw_tile_proc */
    01386   GetSlopeZ_TunnelBridge,          /* get_slope_z_proc */
    01387   ClearTile_TunnelBridge,          /* clear_tile_proc */
    01388   GetAcceptedCargo_TunnelBridge,   /* get_accepted_cargo_proc */
    01389   GetTileDesc_TunnelBridge,        /* get_tile_desc_proc */
    01390   GetTileTrackStatus_TunnelBridge, /* get_tile_track_status_proc */
    01391   ClickTile_TunnelBridge,          /* click_tile_proc */
    01392   AnimateTile_TunnelBridge,        /* animate_tile_proc */
    01393   TileLoop_TunnelBridge,           /* tile_loop_clear */
    01394   ChangeTileOwner_TunnelBridge,    /* change_tile_owner_clear */
    01395   NULL,                            /* get_produced_cargo_proc */
    01396   VehicleEnter_TunnelBridge,       /* vehicle_enter_tile_proc */
    01397   GetFoundation_TunnelBridge,      /* get_foundation_proc */
    01398   TerraformTile_TunnelBridge,      /* terraform_tile_proc */
    01399 };