tunnelbridge_cmd.cpp

Go to the documentation of this file.
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 };

Generated on Mon Sep 22 20:34:20 2008 for openttd by  doxygen 1.5.6