tunnelbridge_cmd.cpp

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00001 /* $Id: tunnelbridge_cmd.cpp 15601 2009-03-02 22:57:47Z rubidium $ */
00002 
00008 #include "stdafx.h"
00009 #include "openttd.h"
00010 #include "rail_map.h"
00011 #include "landscape.h"
00012 #include "town_type.h"
00013 #include "unmovable_map.h"
00014 #include "viewport_func.h"
00015 #include "command_func.h"
00016 #include "town.h"
00017 #include "variables.h"
00018 #include "train.h"
00019 #include "water_map.h"
00020 #include "yapf/yapf.h"
00021 #include "newgrf_sound.h"
00022 #include "autoslope.h"
00023 #include "tunnelbridge_map.h"
00024 #include "strings_func.h"
00025 #include "date_func.h"
00026 #include "functions.h"
00027 #include "vehicle_func.h"
00028 #include "sound_func.h"
00029 #include "tunnelbridge.h"
00030 #include "engine_base.h"
00031 #include "cheat_type.h"
00032 #include "elrail_func.h"
00033 #include "landscape_type.h"
00034 
00035 #include "table/sprites.h"
00036 #include "table/strings.h"
00037 #include "table/bridge_land.h"
00038 
00039 BridgeSpec _bridge[MAX_BRIDGES];
00040 TileIndex _build_tunnel_endtile;
00041 
00043 void ResetBridges()
00044 {
00045   /* First, free sprite table data */
00046   for (BridgeType i = 0; i < MAX_BRIDGES; i++) {
00047     if (_bridge[i].sprite_table != NULL) {
00048       for (BridgePieces j = BRIDGE_PIECE_NORTH; j < BRIDGE_PIECE_INVALID; j++) free(_bridge[i].sprite_table[j]);
00049       free(_bridge[i].sprite_table);
00050     }
00051   }
00052 
00053   /* Then, wipe out current bidges */
00054   memset(&_bridge, 0, sizeof(_bridge));
00055   /* And finally, reinstall default data */
00056   memcpy(&_bridge, &_orig_bridge, sizeof(_orig_bridge));
00057 }
00058 
00062 int CalcBridgeLenCostFactor(int x)
00063 {
00064   int n;
00065   int r;
00066 
00067   if (x < 2) return x;
00068   x -= 2;
00069   for (n = 0, r = 2;; n++) {
00070     if (x <= n) return r + x * n;
00071     r += n * n;
00072     x -= n;
00073   }
00074 }
00075 
00076 Foundation GetBridgeFoundation(Slope tileh, Axis axis)
00077 {
00078   if ((tileh == SLOPE_FLAT) ||
00079       (((tileh == SLOPE_NE) || (tileh == SLOPE_SW)) && (axis == AXIS_X)) ||
00080       (((tileh == SLOPE_NW) || (tileh == SLOPE_SE)) && (axis == AXIS_Y))) return FOUNDATION_NONE;
00081 
00082   return (HasSlopeHighestCorner(tileh) ? InclinedFoundation(axis) : FlatteningFoundation(tileh));
00083 }
00084 
00092 bool HasBridgeFlatRamp(Slope tileh, Axis axis)
00093 {
00094   ApplyFoundationToSlope(GetBridgeFoundation(tileh, axis), &tileh);
00095   /* If the foundation slope is flat the bridge has a non-flat ramp and vice versa. */
00096   return (tileh != SLOPE_FLAT);
00097 }
00098 
00099 static inline const PalSpriteID *GetBridgeSpriteTable(int index, BridgePieces table)
00100 {
00101   const BridgeSpec *bridge = GetBridgeSpec(index);
00102   assert(table < BRIDGE_PIECE_INVALID);
00103   if (bridge->sprite_table == NULL || bridge->sprite_table[table] == NULL) {
00104     return _bridge_sprite_table[index][table];
00105   } else {
00106     return bridge->sprite_table[table];
00107   }
00108 }
00109 
00110 
00119 static CommandCost CheckBridgeSlopeNorth(Axis axis, Slope *tileh, uint *z)
00120 {
00121   Foundation f = GetBridgeFoundation(*tileh, axis);
00122   *z += ApplyFoundationToSlope(f, tileh);
00123 
00124   Slope valid_inclined = (axis == AXIS_X ? SLOPE_NE : SLOPE_NW);
00125   if ((*tileh != SLOPE_FLAT) && (*tileh != valid_inclined)) return CMD_ERROR;
00126 
00127   if (f == FOUNDATION_NONE) return CommandCost();
00128 
00129   return CommandCost(EXPENSES_CONSTRUCTION, _price.terraform);
00130 }
00131 
00140 static CommandCost CheckBridgeSlopeSouth(Axis axis, Slope *tileh, uint *z)
00141 {
00142   Foundation f = GetBridgeFoundation(*tileh, axis);
00143   *z += ApplyFoundationToSlope(f, tileh);
00144 
00145   Slope valid_inclined = (axis == AXIS_X ? SLOPE_SW : SLOPE_SE);
00146   if ((*tileh != SLOPE_FLAT) && (*tileh != valid_inclined)) return CMD_ERROR;
00147 
00148   if (f == FOUNDATION_NONE) return CommandCost();
00149 
00150   return CommandCost(EXPENSES_CONSTRUCTION, _price.terraform);
00151 }
00152 
00153 bool CheckBridge_Stuff(BridgeType bridge_type, uint bridge_len, DoCommandFlag flags)
00154 {
00155   if (flags & DC_QUERY_COST) {
00156     return bridge_len <= (_settings_game.construction.longbridges ? 100U : 16U);
00157   }
00158 
00159   if (bridge_type >= MAX_BRIDGES) return false;
00160 
00161   const BridgeSpec *b = GetBridgeSpec(bridge_type);
00162   if (b->avail_year > _cur_year) return false;
00163 
00164   uint max = b->max_length;
00165   if (max >= 16 && _settings_game.construction.longbridges) max = 100;
00166 
00167   return b->min_length <= bridge_len && bridge_len <= max;
00168 }
00169 
00179 CommandCost CmdBuildBridge(TileIndex end_tile, DoCommandFlag flags, uint32 p1, uint32 p2, const char *text)
00180 {
00181   BridgeType bridge_type;
00182   RailType railtype = INVALID_RAILTYPE;
00183   RoadTypes roadtypes = ROADTYPES_NONE;
00184   uint x;
00185   uint y;
00186   uint sx;
00187   uint sy;
00188   TileIndex tile_start;
00189   TileIndex tile_end;
00190   Slope tileh_start;
00191   Slope tileh_end;
00192   uint z_start;
00193   uint z_end;
00194   TileIndex tile;
00195   TileIndexDiff delta;
00196   uint bridge_len;
00197   Axis direction;
00198   CommandCost cost(EXPENSES_CONSTRUCTION);
00199   CommandCost ret;
00200   bool replace_bridge = false;
00201   BridgeType replaced_bridge_type;
00202   TransportType transport_type;
00203 
00204   /* unpack parameters */
00205   bridge_type = GB(p2, 0, 8);
00206 
00207   if (p1 >= MapSize()) return CMD_ERROR;
00208 
00209   transport_type = (TransportType)GB(p2, 15, 2);
00210 
00211   /* type of bridge */
00212   switch (transport_type) {
00213     case TRANSPORT_ROAD:
00214       roadtypes = (RoadTypes)GB(p2, 8, 2);
00215       if (!AreValidRoadTypes(roadtypes) || !HasRoadTypesAvail(_current_company, roadtypes)) return CMD_ERROR;
00216       break;
00217 
00218     case TRANSPORT_RAIL:
00219       railtype = (RailType)GB(p2, 8, 7);
00220       if (!ValParamRailtype(railtype)) return CMD_ERROR;
00221       break;
00222 
00223     case TRANSPORT_WATER:
00224       break;
00225 
00226     default:
00227       /* Airports don't have tunnels. */
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   bridge_len = sx + sy - x - y - 1;
00249   if (transport_type != TRANSPORT_WATER) {
00250     /* set and test bridge length, availability */
00251     if (!CheckBridge_Stuff(bridge_type, bridge_len, flags)) return_cmd_error(STR_5015_CAN_T_BUILD_BRIDGE_HERE);
00252   }
00253 
00254   /* retrieve landscape height and ensure it's on land */
00255   tile_start = TileXY(x, y);
00256   tile_end = TileXY(sx, sy);
00257   if (IsWaterTile(tile_start) || IsWaterTile(tile_end)) {
00258     return_cmd_error(STR_02A0_ENDS_OF_BRIDGE_MUST_BOTH);
00259   }
00260 
00261   tileh_start = GetTileSlope(tile_start, &z_start);
00262   tileh_end = GetTileSlope(tile_end, &z_end);
00263 
00264   CommandCost terraform_cost_north = CheckBridgeSlopeNorth(direction, &tileh_start, &z_start);
00265   CommandCost terraform_cost_south = CheckBridgeSlopeSouth(direction, &tileh_end,   &z_end);
00266 
00267   if (z_start != z_end) return_cmd_error(STR_BRIDGEHEADS_NOT_SAME_HEIGHT);
00268 
00269   if (IsBridgeTile(tile_start) && IsBridgeTile(tile_end) &&
00270       GetOtherBridgeEnd(tile_start) == tile_end &&
00271       GetTunnelBridgeTransportType(tile_start) == transport_type) {
00272     /* Replace a current bridge. */
00273 
00274     /* If this is a railway bridge, make sure the railtypes match. */
00275     if (transport_type == TRANSPORT_RAIL && GetRailType(tile_start) != railtype) {
00276       return_cmd_error(STR_5007_MUST_DEMOLISH_BRIDGE_FIRST);
00277     }
00278 
00279     /* Do not replace town bridges with lower speed bridges. */
00280     if (!(flags & DC_QUERY_COST) && IsTileOwner(tile_start, OWNER_TOWN) &&
00281         GetBridgeSpec(bridge_type)->speed < GetBridgeSpec(GetBridgeType(tile_start))->speed) {
00282       Town *t = ClosestTownFromTile(tile_start, UINT_MAX);
00283 
00284       if (t == NULL) {
00285         return CMD_ERROR;
00286       } else {
00287         SetDParam(0, t->index);
00288         return_cmd_error(STR_2009_LOCAL_AUTHORITY_REFUSES);
00289       }
00290     }
00291 
00292     /* Do not replace the bridge with the same bridge type. */
00293     if (!(flags & DC_QUERY_COST) && bridge_type == GetBridgeType(tile_start)) {
00294       return_cmd_error(STR_1007_ALREADY_BUILT);
00295     }
00296 
00297     /* Do not allow replacing another company's bridges. */
00298     if (!IsTileOwner(tile_start, _current_company) && !IsTileOwner(tile_start, OWNER_TOWN)) {
00299       return_cmd_error(STR_1024_AREA_IS_OWNED_BY_ANOTHER);
00300     }
00301 
00302     cost.AddCost((bridge_len + 1) * _price.clear_bridge); // The cost of clearing the current bridge.
00303     replace_bridge = true;
00304     replaced_bridge_type = GetBridgeType(tile_start);
00305 
00306     /* Do not remove road types when upgrading a bridge */
00307     roadtypes |= GetRoadTypes(tile_start);
00308   } else {
00309     /* Build a new bridge. */
00310 
00311     bool allow_on_slopes = (_settings_game.construction.build_on_slopes && transport_type != TRANSPORT_WATER);
00312 
00313     /* Try and clear the start landscape */
00314     ret = DoCommand(tile_start, 0, 0, flags, CMD_LANDSCAPE_CLEAR);
00315     if (CmdFailed(ret)) return ret;
00316     cost = ret;
00317 
00318     if (CmdFailed(terraform_cost_north) || (terraform_cost_north.GetCost() != 0 && !allow_on_slopes))
00319       return_cmd_error(STR_1000_LAND_SLOPED_IN_WRONG_DIRECTION);
00320     cost.AddCost(terraform_cost_north);
00321 
00322     /* Try and clear the end landscape */
00323     ret = DoCommand(tile_end, 0, 0, flags, CMD_LANDSCAPE_CLEAR);
00324     if (CmdFailed(ret)) return ret;
00325     cost.AddCost(ret);
00326 
00327     /* false - end tile slope check */
00328     if (CmdFailed(terraform_cost_south) || (terraform_cost_south.GetCost() != 0 && !allow_on_slopes))
00329       return_cmd_error(STR_1000_LAND_SLOPED_IN_WRONG_DIRECTION);
00330     cost.AddCost(terraform_cost_south);
00331 
00332     if (transport_type == TRANSPORT_WATER && (tileh_start == SLOPE_FLAT || tileh_end == SLOPE_FLAT)) return_cmd_error(STR_1000_LAND_SLOPED_IN_WRONG_DIRECTION);
00333   }
00334 
00335   if (!replace_bridge) {
00336     TileIndex Heads[] = {tile_start, tile_end};
00337     int i;
00338 
00339     for (i = 0; i < 2; i++) {
00340       if (MayHaveBridgeAbove(Heads[i])) {
00341         if (IsBridgeAbove(Heads[i])) {
00342           TileIndex north_head = GetNorthernBridgeEnd(Heads[i]);
00343 
00344           if (direction == GetBridgeAxis(Heads[i])) return_cmd_error(STR_5007_MUST_DEMOLISH_BRIDGE_FIRST);
00345 
00346           if (z_start + TILE_HEIGHT == GetBridgeHeight(north_head)) {
00347             return_cmd_error(STR_5007_MUST_DEMOLISH_BRIDGE_FIRST);
00348           }
00349         }
00350       }
00351     }
00352   }
00353 
00354   /* do the drill? */
00355   if (flags & DC_EXEC) {
00356     DiagDirection dir = AxisToDiagDir(direction);
00357     Owner owner = replace_bridge ? GetTileOwner(tile_start) : _current_company;
00358 
00359     switch (transport_type) {
00360       case TRANSPORT_RAIL:
00361         MakeRailBridgeRamp(tile_start, owner, bridge_type, dir,                 railtype);
00362         MakeRailBridgeRamp(tile_end,   owner, bridge_type, ReverseDiagDir(dir), railtype);
00363         break;
00364 
00365       case TRANSPORT_ROAD:
00366         MakeRoadBridgeRamp(tile_start, owner, bridge_type, dir,                 roadtypes);
00367         MakeRoadBridgeRamp(tile_end,   owner, bridge_type, ReverseDiagDir(dir), roadtypes);
00368         break;
00369 
00370       case TRANSPORT_WATER:
00371         MakeAqueductBridgeRamp(tile_start, owner, dir);
00372         MakeAqueductBridgeRamp(tile_end,   owner, ReverseDiagDir(dir));
00373         break;
00374 
00375       default:
00376         NOT_REACHED();
00377         break;
00378     }
00379     MarkTileDirtyByTile(tile_start);
00380     MarkTileDirtyByTile(tile_end);
00381   }
00382 
00383   delta = (direction == AXIS_X ? TileDiffXY(1, 0) : TileDiffXY(0, 1));
00384   for (tile = tile_start + delta; tile != tile_end; tile += delta) {
00385     if (GetTileMaxZ(tile) > z_start) return_cmd_error(STR_BRIDGE_TOO_LOW_FOR_TERRAIN);
00386 
00387     if (MayHaveBridgeAbove(tile) && IsBridgeAbove(tile) && !replace_bridge) {
00388       /* Disallow crossing bridges for the time being */
00389       return_cmd_error(STR_5007_MUST_DEMOLISH_BRIDGE_FIRST);
00390     }
00391 
00392     switch (GetTileType(tile)) {
00393       case MP_WATER:
00394         if (!IsWater(tile) && !IsCoast(tile)) goto not_valid_below;
00395         break;
00396 
00397       case MP_RAILWAY:
00398         if (!IsPlainRailTile(tile)) goto not_valid_below;
00399         break;
00400 
00401       case MP_ROAD:
00402         if (IsRoadDepot(tile)) goto not_valid_below;
00403         break;
00404 
00405       case MP_TUNNELBRIDGE:
00406         if (IsTunnel(tile)) break;
00407         if (replace_bridge) break;
00408         if (direction == DiagDirToAxis(GetTunnelBridgeDirection(tile))) goto not_valid_below;
00409         if (z_start < GetBridgeHeight(tile)) goto not_valid_below;
00410         break;
00411 
00412       case MP_UNMOVABLE:
00413         if (!IsOwnedLand(tile)) goto not_valid_below;
00414         break;
00415 
00416       case MP_CLEAR:
00417         break;
00418 
00419       default:
00420 not_valid_below:;
00421         /* try and clear the middle landscape */
00422         ret = DoCommand(tile, 0, 0, flags, CMD_LANDSCAPE_CLEAR);
00423         if (CmdFailed(ret)) return ret;
00424         cost.AddCost(ret);
00425         break;
00426     }
00427 
00428     if (flags & DC_EXEC) {
00429       SetBridgeMiddle(tile, direction);
00430       MarkTileDirtyByTile(tile);
00431     }
00432   }
00433 
00434   if (flags & DC_EXEC && transport_type == TRANSPORT_RAIL) {
00435     Track track = AxisToTrack(direction);
00436     AddSideToSignalBuffer(tile_start, INVALID_DIAGDIR, _current_company);
00437     YapfNotifyTrackLayoutChange(tile_start, track);
00438   }
00439 
00440   /* for human player that builds the bridge he gets a selection to choose from bridges (DC_QUERY_COST)
00441    * It's unnecessary to execute this command every time for every bridge. So it is done only
00442    * and cost is computed in "bridge_gui.c". For AI, Towns this has to be of course calculated
00443    */
00444   if (!(flags & DC_QUERY_COST) || (IsValidCompanyID(_current_company) && GetCompany(_current_company)->is_ai)) {
00445     bridge_len += 2; // begin and end tiles/ramps
00446 
00447     if (IsValidCompanyID(_current_company))
00448       bridge_len = CalcBridgeLenCostFactor(bridge_len);
00449 
00450     cost.AddCost((int64)bridge_len * _price.build_bridge * GetBridgeSpec(bridge_type)->price >> 8);
00451 
00452     /* Aqueducts are a little more expensive. */
00453     if (transport_type == TRANSPORT_WATER) cost.AddCost((int64)bridge_len * _price.clear_water);
00454   }
00455 
00456   return cost;
00457 }
00458 
00459 
00466 CommandCost CmdBuildTunnel(TileIndex start_tile, DoCommandFlag flags, uint32 p1, uint32 p2, const char *text)
00467 {
00468   TileIndexDiff delta;
00469   TileIndex end_tile;
00470   DiagDirection direction;
00471   Slope start_tileh;
00472   Slope end_tileh;
00473   TransportType transport_type = (TransportType)GB(p1, 9, 1);
00474   uint start_z;
00475   uint end_z;
00476   CommandCost cost(EXPENSES_CONSTRUCTION);
00477   CommandCost ret;
00478 
00479   _build_tunnel_endtile = 0;
00480   if (transport_type == TRANSPORT_RAIL) {
00481     if (!ValParamRailtype((RailType)p1)) return CMD_ERROR;
00482   } else {
00483     const RoadTypes rts = (RoadTypes)GB(p1, 0, 2);
00484     if (!AreValidRoadTypes(rts) || !HasRoadTypesAvail(_current_company, rts)) return CMD_ERROR;
00485   }
00486 
00487   start_tileh = GetTileSlope(start_tile, &start_z);
00488   direction = GetInclinedSlopeDirection(start_tileh);
00489   if (direction == INVALID_DIAGDIR) return_cmd_error(STR_500B_SITE_UNSUITABLE_FOR_TUNNEL);
00490 
00491   if (IsWaterTile(start_tile)) return_cmd_error(STR_3807_CAN_T_BUILD_ON_WATER);
00492 
00493   ret = DoCommand(start_tile, 0, 0, flags, CMD_LANDSCAPE_CLEAR);
00494   if (CmdFailed(ret)) return ret;
00495 
00496   /* XXX - do NOT change 'ret' in the loop, as it is used as the price
00497    * for the clearing of the entrance of the tunnel. Assigning it to
00498    * cost before the loop will yield different costs depending on start-
00499    * position, because of increased-cost-by-length: 'cost += cost >> 3' */
00500 
00501   delta = TileOffsByDiagDir(direction);
00502   DiagDirection tunnel_in_way_dir;
00503   if (DiagDirToAxis(direction) == AXIS_Y) {
00504     tunnel_in_way_dir = (TileX(start_tile) < (MapMaxX() / 2)) ? DIAGDIR_SW : DIAGDIR_NE;
00505   } else {
00506     tunnel_in_way_dir = (TileY(start_tile) < (MapMaxX() / 2)) ? DIAGDIR_SE : DIAGDIR_NW;
00507   }
00508 
00509   end_tile = start_tile;
00510 
00512   int tiles_coef = 3;
00514   int tiles = 0;
00516   int tiles_bump = 25;
00517 
00518   for (;;) {
00519     end_tile += delta;
00520     if (!IsValidTile(end_tile)) return_cmd_error(STR_TUNNEL_THROUGH_MAP_BORDER);
00521     end_tileh = GetTileSlope(end_tile, &end_z);
00522 
00523     if (start_z == end_z) break;
00524 
00525     if (!_cheats.crossing_tunnels.value && IsTunnelInWayDir(end_tile, start_z, tunnel_in_way_dir)) {
00526       return_cmd_error(STR_5003_ANOTHER_TUNNEL_IN_THE_WAY);
00527     }
00528 
00529     tiles++;
00530     if (tiles == tiles_bump) {
00531       tiles_coef++;
00532       tiles_bump *= 2;
00533     }
00534 
00535     cost.AddCost(_price.build_tunnel);
00536     cost.AddCost(cost.GetCost() >> tiles_coef); // add a multiplier for longer tunnels
00537   }
00538 
00539   /* Add the cost of the entrance */
00540   cost.AddCost(_price.build_tunnel);
00541   cost.AddCost(ret);
00542 
00543   /* if the command fails from here on we want the end tile to be highlighted */
00544   _build_tunnel_endtile = end_tile;
00545 
00546   if (IsWaterTile(end_tile)) return_cmd_error(STR_3807_CAN_T_BUILD_ON_WATER);
00547 
00548   /* slope of end tile must be complementary to the slope of the start tile */
00549   if (end_tileh != ComplementSlope(start_tileh)) {
00550     /* Check if there is a structure on the terraformed tile. Do not add the cost, that will be done by the terraforming
00551      * Note: Currently the town rating is also affected by this clearing-test. So effectivly the player is punished twice for clearing
00552      *       the tree on end_tile.
00553      */
00554     ret = DoCommand(end_tile, 0, 0, DC_AUTO, CMD_LANDSCAPE_CLEAR);
00555     if (CmdFailed(ret)) return_cmd_error(STR_5005_UNABLE_TO_EXCAVATE_LAND);
00556 
00557     ret = DoCommand(end_tile, end_tileh & start_tileh, 0, flags, CMD_TERRAFORM_LAND);
00558     if (CmdFailed(ret)) return_cmd_error(STR_5005_UNABLE_TO_EXCAVATE_LAND);
00559   } else {
00560     ret = DoCommand(end_tile, 0, 0, flags, CMD_LANDSCAPE_CLEAR);
00561     if (CmdFailed(ret)) return ret;
00562   }
00563   cost.AddCost(_price.build_tunnel);
00564   cost.AddCost(ret);
00565 
00566   if (flags & DC_EXEC) {
00567     if (transport_type == TRANSPORT_RAIL) {
00568       MakeRailTunnel(start_tile, _current_company, direction,                 (RailType)GB(p1, 0, 4));
00569       MakeRailTunnel(end_tile,   _current_company, ReverseDiagDir(direction), (RailType)GB(p1, 0, 4));
00570       AddSideToSignalBuffer(start_tile, INVALID_DIAGDIR, _current_company);
00571       YapfNotifyTrackLayoutChange(start_tile, DiagDirToDiagTrack(direction));
00572     } else {
00573       MakeRoadTunnel(start_tile, _current_company, direction,                 (RoadTypes)GB(p1, 0, 2));
00574       MakeRoadTunnel(end_tile,   _current_company, ReverseDiagDir(direction), (RoadTypes)GB(p1, 0, 2));
00575     }
00576   }
00577 
00578   return cost;
00579 }
00580 
00581 
00582 static inline bool CheckAllowRemoveTunnelBridge(TileIndex tile)
00583 {
00584   /* Floods can remove anything as well as the scenario editor */
00585   if (_current_company == OWNER_WATER || _game_mode == GM_EDITOR) return true;
00586 
00587   RoadTypes rts = GetRoadTypes(tile);
00588   Owner road_owner = _current_company;
00589   Owner tram_owner = _current_company;
00590 
00591   if (HasBit(rts, ROADTYPE_ROAD)) road_owner = GetRoadOwner(tile, ROADTYPE_ROAD);
00592   if (HasBit(rts, ROADTYPE_TRAM)) tram_owner = GetRoadOwner(tile, ROADTYPE_TRAM);
00593 
00594   /* We can remove unowned road and if the town allows it */
00595   if (road_owner == OWNER_NONE || (road_owner == OWNER_TOWN && (_settings_game.construction.extra_dynamite || _cheats.magic_bulldozer.value))) road_owner = _current_company;
00596   if (tram_owner == OWNER_NONE) tram_owner = _current_company;
00597 
00598   return CheckOwnership(road_owner) && CheckOwnership(tram_owner);
00599 }
00600 
00601 static CommandCost DoClearTunnel(TileIndex tile, DoCommandFlag flags)
00602 {
00603   Town *t = NULL;
00604   TileIndex endtile;
00605 
00606   if (!CheckAllowRemoveTunnelBridge(tile)) return CMD_ERROR;
00607 
00608   endtile = GetOtherTunnelEnd(tile);
00609 
00610   if (HasVehicleOnTunnelBridge(tile, endtile)) return CMD_ERROR;
00611 
00612   _build_tunnel_endtile = endtile;
00613 
00614   if (IsTileOwner(tile, OWNER_TOWN) && _game_mode != GM_EDITOR) {
00615     t = ClosestTownFromTile(tile, UINT_MAX); // town penalty rating
00616 
00617     /* Check if you are allowed to remove the tunnel owned by a town
00618      * Removal depends on difficulty settings */
00619     if (!CheckforTownRating(flags, t, TUNNELBRIDGE_REMOVE)) {
00620       SetDParam(0, t->index);
00621       return_cmd_error(STR_2009_LOCAL_AUTHORITY_REFUSES);
00622     }
00623   }
00624 
00625   /* checks if the owner is town then decrease town rating by RATING_TUNNEL_BRIDGE_DOWN_STEP until
00626    * you have a "Poor" (0) town rating */
00627   if (IsTileOwner(tile, OWNER_TOWN) && _game_mode != GM_EDITOR) {
00628     ChangeTownRating(t, RATING_TUNNEL_BRIDGE_DOWN_STEP, RATING_TUNNEL_BRIDGE_MINIMUM, flags);
00629   }
00630 
00631   if (flags & DC_EXEC) {
00632     if (GetTunnelBridgeTransportType(tile) == TRANSPORT_RAIL) {
00633       /* We first need to request values before calling DoClearSquare */
00634       DiagDirection dir = GetTunnelBridgeDirection(tile);
00635       Track track = DiagDirToDiagTrack(dir);
00636       Owner owner = GetTileOwner(tile);
00637 
00638       Vehicle *v = NULL;
00639       if (GetTunnelBridgeReservation(tile)) {
00640         v = GetTrainForReservation(tile, track);
00641         if (v != NULL) FreeTrainTrackReservation(v);
00642       }
00643 
00644       DoClearSquare(tile);
00645       DoClearSquare(endtile);
00646 
00647       /* cannot use INVALID_DIAGDIR for signal update because the tunnel doesn't exist anymore */
00648       AddSideToSignalBuffer(tile,    ReverseDiagDir(dir), owner);
00649       AddSideToSignalBuffer(endtile, dir,                 owner);
00650 
00651       YapfNotifyTrackLayoutChange(tile,    track);
00652       YapfNotifyTrackLayoutChange(endtile, track);
00653 
00654       if (v != NULL) TryPathReserve(v);
00655     } else {
00656       DoClearSquare(tile);
00657       DoClearSquare(endtile);
00658     }
00659   }
00660   return CommandCost(EXPENSES_CONSTRUCTION, _price.clear_tunnel * (GetTunnelBridgeLength(tile, endtile) + 2));
00661 }
00662 
00663 
00664 static CommandCost DoClearBridge(TileIndex tile, DoCommandFlag flags)
00665 {
00666   DiagDirection direction;
00667   TileIndexDiff delta;
00668   TileIndex endtile;
00669   Town *t = NULL;
00670 
00671   if (!CheckAllowRemoveTunnelBridge(tile)) return CMD_ERROR;
00672 
00673   endtile = GetOtherBridgeEnd(tile);
00674 
00675   if (HasVehicleOnTunnelBridge(tile, endtile)) return CMD_ERROR;
00676 
00677   direction = GetTunnelBridgeDirection(tile);
00678   delta = TileOffsByDiagDir(direction);
00679 
00680   if (IsTileOwner(tile, OWNER_TOWN) && _game_mode != GM_EDITOR) {
00681     t = ClosestTownFromTile(tile, UINT_MAX); // town penalty rating
00682 
00683     /* Check if you are allowed to remove the bridge owned by a town
00684      * Removal depends on difficulty settings */
00685     if (!CheckforTownRating(flags, t, TUNNELBRIDGE_REMOVE)) {
00686       SetDParam(0, t->index);
00687       return_cmd_error(STR_2009_LOCAL_AUTHORITY_REFUSES);
00688     }
00689   }
00690 
00691   /* checks if the owner is town then decrease town rating by RATING_TUNNEL_BRIDGE_DOWN_STEP until
00692    * you have a "Poor" (0) town rating */
00693   if (IsTileOwner(tile, OWNER_TOWN) && _game_mode != GM_EDITOR) {
00694     ChangeTownRating(t, RATING_TUNNEL_BRIDGE_DOWN_STEP, RATING_TUNNEL_BRIDGE_MINIMUM, flags);
00695   }
00696 
00697   if (flags & DC_EXEC) {
00698     /* read this value before actual removal of bridge */
00699     bool rail = GetTunnelBridgeTransportType(tile) == TRANSPORT_RAIL;
00700     Owner owner = GetTileOwner(tile);
00701     uint height = GetBridgeHeight(tile);
00702     Vehicle *v = NULL;
00703 
00704     if (rail && GetTunnelBridgeReservation(tile)) {
00705       v = GetTrainForReservation(tile, DiagDirToDiagTrack(direction));
00706       if (v != NULL) FreeTrainTrackReservation(v);
00707     }
00708 
00709     DoClearSquare(tile);
00710     DoClearSquare(endtile);
00711     for (TileIndex c = tile + delta; c != endtile; c += delta) {
00712       /* do not let trees appear from 'nowhere' after removing bridge */
00713       if (IsNormalRoadTile(c) && GetRoadside(c) == ROADSIDE_TREES) {
00714         uint minz = GetTileMaxZ(c) + 3 * TILE_HEIGHT;
00715         if (height < minz) SetRoadside(c, ROADSIDE_PAVED);
00716       }
00717       ClearBridgeMiddle(c);
00718       MarkTileDirtyByTile(c);
00719     }
00720 
00721     if (rail) {
00722       /* cannot use INVALID_DIAGDIR for signal update because the bridge doesn't exist anymore */
00723       AddSideToSignalBuffer(tile,    ReverseDiagDir(direction), owner);
00724       AddSideToSignalBuffer(endtile, direction,                 owner);
00725 
00726       Track track = DiagDirToDiagTrack(direction);
00727       YapfNotifyTrackLayoutChange(tile,    track);
00728       YapfNotifyTrackLayoutChange(endtile, track);
00729 
00730       if (v != NULL) TryPathReserve(v, true);
00731     }
00732   }
00733 
00734   return CommandCost(EXPENSES_CONSTRUCTION, (GetTunnelBridgeLength(tile, endtile) + 2) * _price.clear_bridge);
00735 }
00736 
00737 static CommandCost ClearTile_TunnelBridge(TileIndex tile, DoCommandFlag flags)
00738 {
00739   if (IsTunnel(tile)) {
00740     if (flags & DC_AUTO) return_cmd_error(STR_5006_MUST_DEMOLISH_TUNNEL_FIRST);
00741     return DoClearTunnel(tile, flags);
00742   } else { // IsBridge(tile)
00743     if (flags & DC_AUTO) return_cmd_error(STR_5007_MUST_DEMOLISH_BRIDGE_FIRST);
00744     return DoClearBridge(tile, flags);
00745   }
00746 
00747   return CMD_ERROR;
00748 }
00749 
00761 static void DrawBridgePillars(const PalSpriteID *psid, const TileInfo *ti, Axis axis, bool drawfarpillar, int x, int y, int z_bridge)
00762 {
00763   /* Do not draw bridge pillars if they are invisible */
00764   if (IsInvisibilitySet(TO_BRIDGES)) return;
00765 
00766   SpriteID image = psid->sprite;
00767 
00768   if (image != 0) {
00769     /* "side" specifies the side the pillars stand on.
00770      * The length of the pillars is then set to the height of the bridge over the corners of this edge.
00771      *
00772      *                axis==AXIS_X  axis==AXIS_Y
00773      *   side==false      SW            NW
00774      *   side==true       NE            SE
00775      *
00776      * I have no clue, why this was done this way.
00777      */
00778     bool side = HasBit(image, 0);
00779 
00780     /* "dir" means the edge the pillars stand on */
00781     DiagDirection dir = AxisToDiagDir(axis);
00782     if (side != (axis == AXIS_Y)) dir = ReverseDiagDir(dir);
00783 
00784     /* Determine ground height under pillars */
00785     int front_height = ti->z;
00786     int back_height = ti->z;
00787     GetSlopeZOnEdge(ti->tileh, dir, &front_height, &back_height);
00788 
00789     /* x and y size of bounding-box of pillars */
00790     int w = (axis == AXIS_X ? 16 : 2);
00791     int h = (axis == AXIS_X ? 2 : 16);
00792     /* sprite position of back facing pillar */
00793     int x_back = x - (axis == AXIS_X ? 0 : 9);
00794     int y_back = y - (axis == AXIS_X ? 9 : 0);
00795 
00796     for (int cur_z = z_bridge; cur_z >= front_height || cur_z >= back_height; cur_z -= TILE_HEIGHT) {
00797       /* Draw front facing pillar */
00798       if (cur_z >= front_height) {
00799         AddSortableSpriteToDraw(image, psid->pal, x, y, w, h, BB_HEIGHT_UNDER_BRIDGE - 5, cur_z, IsTransparencySet(TO_BRIDGES), 0, 0, -5);
00800       }
00801 
00802       /* Draw back facing pillar, but not the highest part directly under the bridge-floor */
00803       if (drawfarpillar && cur_z >= back_height && cur_z < z_bridge - TILE_HEIGHT) {
00804         AddSortableSpriteToDraw(image, psid->pal, x_back, y_back, w, h, BB_HEIGHT_UNDER_BRIDGE - 5, cur_z, IsTransparencySet(TO_BRIDGES), 0, 0, -5);
00805       }
00806     }
00807   }
00808 }
00809 
00819 static void DrawBridgeTramBits(int x, int y, byte z, int offset, bool overlay, bool head)
00820 {
00821   static const SpriteID tram_offsets[2][6] = { { 107, 108, 109, 110, 111, 112 }, { 4, 5, 15, 16, 17, 18 } };
00822   static const SpriteID back_offsets[6]    =   {  95,  96,  99, 102, 100, 101 };
00823   static const SpriteID front_offsets[6]   =   {  97,  98, 103, 106, 104, 105 };
00824 
00825   static const uint size_x[6] = {  1, 16, 16,  1, 16,  1 };
00826   static const uint size_y[6] = { 16,  1,  1, 16,  1, 16 };
00827   static const uint front_bb_offset_x[6] = { 15,  0,  0, 15,  0, 15 };
00828   static const uint front_bb_offset_y[6] = {  0, 15, 15,  0, 15,  0 };
00829 
00830   /* The sprites under the vehicles are drawn as SpriteCombine. StartSpriteCombine() has already been called
00831    * The bounding boxes here are the same as for bridge front/roof */
00832   if (head || !IsInvisibilitySet(TO_BRIDGES)) {
00833     AddSortableSpriteToDraw(SPR_TRAMWAY_BASE + tram_offsets[overlay][offset], PAL_NONE,
00834       x, y, size_x[offset], size_y[offset], 0x28, z,
00835       !head && IsTransparencySet(TO_BRIDGES));
00836   }
00837 
00838   /* Do not draw catenary if it is set invisible */
00839   if (!IsInvisibilitySet(TO_CATENARY)) {
00840     AddSortableSpriteToDraw(SPR_TRAMWAY_BASE + back_offsets[offset], PAL_NONE,
00841       x, y, size_x[offset], size_y[offset], 0x28, z,
00842       IsTransparencySet(TO_CATENARY));
00843   }
00844 
00845   /* Start a new SpriteCombine for the front part */
00846   EndSpriteCombine();
00847   StartSpriteCombine();
00848 
00849   /* For sloped sprites the bounding box needs to be higher, as the pylons stop on a higher point */
00850   if (!IsInvisibilitySet(TO_CATENARY)) {
00851     AddSortableSpriteToDraw(SPR_TRAMWAY_BASE + front_offsets[offset], PAL_NONE,
00852       x, y, size_x[offset] + front_bb_offset_x[offset], size_y[offset] + front_bb_offset_y[offset], 0x28, z,
00853       IsTransparencySet(TO_CATENARY), front_bb_offset_x[offset], front_bb_offset_y[offset]);
00854   }
00855 }
00856 
00870 static void DrawTile_TunnelBridge(TileInfo *ti)
00871 {
00872   SpriteID image;
00873   TransportType transport_type = GetTunnelBridgeTransportType(ti->tile);
00874   DiagDirection tunnelbridge_direction = GetTunnelBridgeDirection(ti->tile);
00875 
00876   if (IsTunnel(ti->tile)) {
00877     /* Front view of tunnel bounding boxes:
00878      *
00879      *   122223  <- BB_Z_SEPARATOR
00880      *   1    3
00881      *   1    3                1,3 = empty helper BB
00882      *   1    3                  2 = SpriteCombine of tunnel-roof and catenary (tram & elrail)
00883      *
00884      */
00885 
00886     static const int _tunnel_BB[4][12] = {
00887       /*  tunnnel-roof  |  Z-separator  | tram-catenary
00888        * w  h  bb_x bb_y| x   y   w   h |bb_x bb_y w h */
00889       {  1,  0, -15, -14,  0, 15, 16,  1, 0, 1, 16, 15 }, // NE
00890       {  0,  1, -14, -15, 15,  0,  1, 16, 1, 0, 15, 16 }, // SE
00891       {  1,  0, -15, -14,  0, 15, 16,  1, 0, 1, 16, 15 }, // SW
00892       {  0,  1, -14, -15, 15,  0,  1, 16, 1, 0, 15, 16 }, // NW
00893     };
00894     const int *BB_data = _tunnel_BB[tunnelbridge_direction];
00895 
00896     bool catenary = false;
00897 
00898     if (transport_type == TRANSPORT_RAIL) {
00899       image = GetRailTypeInfo(GetRailType(ti->tile))->base_sprites.tunnel;
00900     } else {
00901       image = SPR_TUNNEL_ENTRY_REAR_ROAD;
00902     }
00903 
00904     if (HasTunnelBridgeSnowOrDesert(ti->tile)) image += 32;
00905 
00906     image += tunnelbridge_direction * 2;
00907     DrawGroundSprite(image, PAL_NONE);
00908 
00909     /* PBS debugging, draw reserved tracks darker */
00910     if (_game_mode != GM_MENU && _settings_client.gui.show_track_reservation && (transport_type == TRANSPORT_RAIL && GetTunnelBridgeReservation(ti->tile))) {
00911       const RailtypeInfo *rti = GetRailTypeInfo(GetRailType(ti->tile));
00912       DrawGroundSprite(DiagDirToAxis(tunnelbridge_direction) == AXIS_X ? rti->base_sprites.single_y : rti->base_sprites.single_x, PALETTE_CRASH);
00913     }
00914 
00915     if (transport_type == TRANSPORT_ROAD) {
00916       RoadTypes rts = GetRoadTypes(ti->tile);
00917 
00918       if (HasBit(rts, ROADTYPE_TRAM)) {
00919         static const SpriteID tunnel_sprites[2][4] = { { 28, 78, 79, 27 }, {  5, 76, 77,  4 } };
00920 
00921         DrawGroundSprite(SPR_TRAMWAY_BASE + tunnel_sprites[rts - ROADTYPES_TRAM][tunnelbridge_direction], PAL_NONE);
00922 
00923         /* Do not draw wires if they are invisible */
00924         if (!IsInvisibilitySet(TO_CATENARY)) {
00925           catenary = true;
00926           StartSpriteCombine();
00927           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);
00928         }
00929       }
00930     } else if (HasCatenaryDrawn(GetRailType(ti->tile))) {
00931       /* Maybe draw pylons on the entry side */
00932       DrawCatenary(ti);
00933 
00934       catenary = true;
00935       StartSpriteCombine();
00936       /* Draw wire above the ramp */
00937       DrawCatenaryOnTunnel(ti);
00938     }
00939 
00940     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);
00941 
00942     if (catenary) EndSpriteCombine();
00943 
00944     /* Add helper BB for sprite sorting, that separate the tunnel from things beside of it */
00945     AddSortableSpriteToDraw(SPR_EMPTY_BOUNDING_BOX, PAL_NONE, ti->x             , ti->y             , BB_data[6], BB_data[7], TILE_HEIGHT, ti->z);
00946     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);
00947 
00948     DrawBridgeMiddle(ti);
00949   } else { // IsBridge(ti->tile)
00950     const PalSpriteID *psid;
00951     int base_offset;
00952     bool ice = HasTunnelBridgeSnowOrDesert(ti->tile);
00953 
00954     if (transport_type == TRANSPORT_RAIL) {
00955       base_offset = GetRailTypeInfo(GetRailType(ti->tile))->bridge_offset;
00956       assert(base_offset != 8); // This one is used for roads
00957     } else {
00958       base_offset = 8;
00959     }
00960 
00961     /* as the lower 3 bits are used for other stuff, make sure they are clear */
00962     assert( (base_offset & 0x07) == 0x00);
00963 
00964     DrawFoundation(ti, GetBridgeFoundation(ti->tileh, DiagDirToAxis(tunnelbridge_direction)));
00965 
00966     /* HACK Wizardry to convert the bridge ramp direction into a sprite offset */
00967     base_offset += (6 - tunnelbridge_direction) % 4;
00968 
00969     if (ti->tileh == SLOPE_FLAT) base_offset += 4; // sloped bridge head
00970 
00971     /* Table number BRIDGE_PIECE_HEAD always refers to the bridge heads for any bridge type */
00972     if (transport_type != TRANSPORT_WATER) {
00973       psid = &GetBridgeSpriteTable(GetBridgeType(ti->tile), BRIDGE_PIECE_HEAD)[base_offset];
00974     } else {
00975       psid = _aqueduct_sprites + base_offset;
00976     }
00977 
00978     if (!ice) {
00979       DrawClearLandTile(ti, 3);
00980     } else {
00981       DrawGroundSprite(SPR_FLAT_SNOWY_TILE + _tileh_to_sprite[ti->tileh], PAL_NONE);
00982     }
00983 
00984     /* draw ramp */
00985 
00986     /* Draw Trambits as SpriteCombine */
00987     if (transport_type == TRANSPORT_ROAD) StartSpriteCombine();
00988 
00989     /* HACK set the height of the BB of a sloped ramp to 1 so a vehicle on
00990      * it doesn't disappear behind it
00991      */
00992     /* Bridge heads are drawn solid no matter how invisibility/transparency is set */
00993     AddSortableSpriteToDraw(psid->sprite, psid->pal, ti->x, ti->y, 16, 16, ti->tileh == SLOPE_FLAT ? 0 : 8, ti->z);
00994 
00995     if (_settings_client.gui.show_track_reservation && transport_type == TRANSPORT_RAIL && GetTunnelBridgeReservation(ti->tile)) {
00996       const RailtypeInfo *rti = GetRailTypeInfo(GetRailType(ti->tile));
00997       if (HasBridgeFlatRamp(ti->tileh, DiagDirToAxis(tunnelbridge_direction))) {
00998         AddSortableSpriteToDraw(DiagDirToAxis(tunnelbridge_direction) == AXIS_X ? rti->base_sprites.single_y : rti->base_sprites.single_x, PALETTE_CRASH, ti->x, ti->y, 16, 16, 0, ti->z + 8);
00999       } else {
01000         AddSortableSpriteToDraw(rti->base_sprites.single_sloped + tunnelbridge_direction, PALETTE_CRASH, ti->x, ti->y, 16, 16, 8, ti->z);
01001       }
01002     }
01003 
01004     if (transport_type == TRANSPORT_ROAD) {
01005       RoadTypes rts = GetRoadTypes(ti->tile);
01006 
01007       if (HasBit(rts, ROADTYPE_TRAM)) {
01008         uint offset = tunnelbridge_direction;
01009         uint z = ti->z;
01010         if (ti->tileh != SLOPE_FLAT) {
01011           offset = (offset + 1) & 1;
01012           z += TILE_HEIGHT;
01013         } else {
01014           offset += 2;
01015         }
01016         /* DrawBridgeTramBits() calls EndSpriteCombine() and StartSpriteCombine() */
01017         DrawBridgeTramBits(ti->x, ti->y, z, offset, HasBit(rts, ROADTYPE_ROAD), true);
01018       }
01019       EndSpriteCombine();
01020     } else if (transport_type == TRANSPORT_RAIL) {
01021       if (HasCatenaryDrawn(GetRailType(ti->tile))) {
01022         DrawCatenary(ti);
01023       }
01024     }
01025 
01026     DrawBridgeMiddle(ti);
01027   }
01028 }
01029 
01030 
01048 static BridgePieces CalcBridgePiece(uint north, uint south)
01049 {
01050   if (north == 1) {
01051     return BRIDGE_PIECE_NORTH;
01052   } else if (south == 1) {
01053     return BRIDGE_PIECE_SOUTH;
01054   } else if (north < south) {
01055     return north & 1 ? BRIDGE_PIECE_INNER_SOUTH : BRIDGE_PIECE_INNER_NORTH;
01056   } else if (north > south) {
01057     return south & 1 ? BRIDGE_PIECE_INNER_NORTH : BRIDGE_PIECE_INNER_SOUTH;
01058   } else {
01059     return north & 1 ? BRIDGE_PIECE_MIDDLE_EVEN : BRIDGE_PIECE_MIDDLE_ODD;
01060   }
01061 }
01062 
01063 
01064 void DrawBridgeMiddle(const TileInfo *ti)
01065 {
01066   /* Sectional view of bridge bounding boxes:
01067    *
01068    *  1           2                                1,2 = SpriteCombine of Bridge front/(back&floor) and TramCatenary
01069    *  1           2                                  3 = empty helper BB
01070    *  1     7     2                                4,5 = pillars under higher bridges
01071    *  1 6 88888 6 2                                  6 = elrail-pylons
01072    *  1 6 88888 6 2                                  7 = elrail-wire
01073    *  1 6 88888 6 2  <- TILE_HEIGHT                  8 = rail-vehicle on bridge
01074    *  3333333333333  <- BB_Z_SEPARATOR
01075    *                 <- unused
01076    *    4       5    <- BB_HEIGHT_UNDER_BRIDGE
01077    *    4       5
01078    *    4       5
01079    *
01080    */
01081 
01082   /* Z position of the bridge sprites relative to bridge height (downwards) */
01083   static const int BRIDGE_Z_START = 3;
01084 
01085   if (!IsBridgeAbove(ti->tile)) return;
01086 
01087   TileIndex rampnorth = GetNorthernBridgeEnd(ti->tile);
01088   TileIndex rampsouth = GetSouthernBridgeEnd(ti->tile);
01089   TransportType transport_type = GetTunnelBridgeTransportType(rampsouth);
01090 
01091   Axis axis = GetBridgeAxis(ti->tile);
01092   BridgePieces piece = CalcBridgePiece(
01093     GetTunnelBridgeLength(ti->tile, rampnorth) + 1,
01094     GetTunnelBridgeLength(ti->tile, rampsouth) + 1
01095   );
01096 
01097   const PalSpriteID *psid;
01098   bool drawfarpillar;
01099   if (transport_type != TRANSPORT_WATER) {
01100     BridgeType type =  GetBridgeType(rampsouth);
01101     drawfarpillar = !HasBit(GetBridgeSpec(type)->flags, 0);
01102 
01103     uint base_offset;
01104     if (transport_type == TRANSPORT_RAIL) {
01105       base_offset = GetRailTypeInfo(GetRailType(rampsouth))->bridge_offset;
01106     } else {
01107       base_offset = 8;
01108     }
01109 
01110     psid = base_offset + GetBridgeSpriteTable(type, piece);
01111   } else {
01112     drawfarpillar = true;
01113     psid = _aqueduct_sprites;
01114   }
01115 
01116   if (axis != AXIS_X) psid += 4;
01117 
01118   int x = ti->x;
01119   int y = ti->y;
01120   uint bridge_z = GetBridgeHeight(rampsouth);
01121   uint z = bridge_z - BRIDGE_Z_START;
01122 
01123   /* Add a bounding box, that separates the bridge from things below it. */
01124   AddSortableSpriteToDraw(SPR_EMPTY_BOUNDING_BOX, PAL_NONE, x, y, 16, 16, 1, bridge_z - TILE_HEIGHT + BB_Z_SEPARATOR);
01125 
01126   /* Draw Trambits as SpriteCombine */
01127   if (transport_type == TRANSPORT_ROAD) StartSpriteCombine();
01128 
01129   /* Draw floor and far part of bridge*/
01130   if (!IsInvisibilitySet(TO_BRIDGES)) {
01131     if (axis == AXIS_X) {
01132       AddSortableSpriteToDraw(psid->sprite, psid->pal, x, y, 16, 1, 0x28, z, IsTransparencySet(TO_BRIDGES), 0, 0, BRIDGE_Z_START);
01133     } else {
01134       AddSortableSpriteToDraw(psid->sprite, psid->pal, x, y, 1, 16, 0x28, z, IsTransparencySet(TO_BRIDGES), 0, 0, BRIDGE_Z_START);
01135     }
01136   }
01137 
01138   psid++;
01139 
01140   if (transport_type == TRANSPORT_ROAD) {
01141     RoadTypes rts = GetRoadTypes(rampsouth);
01142 
01143     if (HasBit(rts, ROADTYPE_TRAM)) {
01144       /* DrawBridgeTramBits() calls EndSpriteCombine() and StartSpriteCombine() */
01145       DrawBridgeTramBits(x, y, bridge_z, axis ^ 1, HasBit(rts, ROADTYPE_ROAD), false);
01146     } else {
01147       EndSpriteCombine();
01148       StartSpriteCombine();
01149     }
01150   } else if (transport_type == TRANSPORT_RAIL) {
01151     if (HasCatenaryDrawn(GetRailType(rampsouth))) {
01152       DrawCatenaryOnBridge(ti);
01153     }
01154   }
01155 
01156   /* draw roof, the component of the bridge which is logically between the vehicle and the camera */
01157   if (!IsInvisibilitySet(TO_BRIDGES)) {
01158     if (axis == AXIS_X) {
01159       y += 12;
01160       if (psid->sprite & SPRITE_MASK) AddSortableSpriteToDraw(psid->sprite, psid->pal, x, y, 16, 4, 0x28, z, IsTransparencySet(TO_BRIDGES), 0, 3, BRIDGE_Z_START);
01161     } else {
01162       x += 12;
01163       if (psid->sprite & SPRITE_MASK) AddSortableSpriteToDraw(psid->sprite, psid->pal, x, y, 4, 16, 0x28, z, IsTransparencySet(TO_BRIDGES), 3, 0, BRIDGE_Z_START);
01164     }
01165   }
01166 
01167   /* Draw TramFront as SpriteCombine */
01168   if (transport_type == TRANSPORT_ROAD) EndSpriteCombine();
01169 
01170   /* Do not draw anything more if bridges are invisible */
01171   if (IsInvisibilitySet(TO_BRIDGES)) return;
01172 
01173   psid++;
01174   if (ti->z + 5 == z) {
01175     /* draw poles below for small bridges */
01176     if (psid->sprite != 0) {
01177       SpriteID image = psid->sprite;
01178       SpriteID pal   = psid->pal;
01179       if (IsTransparencySet(TO_BRIDGES)) {
01180         SetBit(image, PALETTE_MODIFIER_TRANSPARENT);
01181         pal = PALETTE_TO_TRANSPARENT;
01182       }
01183 
01184       DrawGroundSpriteAt(image, pal, x, y, z);
01185     }
01186   } else if (_settings_client.gui.bridge_pillars) {
01187     /* draw pillars below for high bridges */
01188     DrawBridgePillars(psid, ti, axis, drawfarpillar, x, y, z);
01189   }
01190 }
01191 
01192 
01193 static uint GetSlopeZ_TunnelBridge(TileIndex tile, uint x, uint y)
01194 {
01195   uint z;
01196   Slope tileh = GetTileSlope(tile, &z);
01197 
01198   x &= 0xF;
01199   y &= 0xF;
01200 
01201   if (IsTunnel(tile)) {
01202     uint pos = (DiagDirToAxis(GetTunnelBridgeDirection(tile)) == AXIS_X ? y : x);
01203 
01204     /* In the tunnel entrance? */
01205     if (5 <= pos && pos <= 10) return z;
01206   } else { // IsBridge(tile)
01207     DiagDirection dir = GetTunnelBridgeDirection(tile);
01208     uint pos = (DiagDirToAxis(dir) == AXIS_X ? y : x);
01209 
01210     z += ApplyFoundationToSlope(GetBridgeFoundation(tileh, DiagDirToAxis(dir)), &tileh);
01211 
01212     /* On the bridge ramp? */
01213     if (5 <= pos && pos <= 10) {
01214       uint delta;
01215 
01216       if (tileh != SLOPE_FLAT) return z + TILE_HEIGHT;
01217 
01218       switch (dir) {
01219         default: NOT_REACHED();
01220         case DIAGDIR_NE: delta = (TILE_SIZE - 1 - x) / 2; break;
01221         case DIAGDIR_SE: delta = y / 2; break;
01222         case DIAGDIR_SW: delta = x / 2; break;
01223         case DIAGDIR_NW: delta = (TILE_SIZE - 1 - y) / 2; break;
01224       }
01225       return z + 1 + delta;
01226     }
01227   }
01228 
01229   return z + GetPartialZ(x, y, tileh);
01230 }
01231 
01232 static Foundation GetFoundation_TunnelBridge(TileIndex tile, Slope tileh)
01233 {
01234   return IsTunnel(tile) ? FOUNDATION_NONE : GetBridgeFoundation(tileh, DiagDirToAxis(GetTunnelBridgeDirection(tile)));
01235 }
01236 
01237 
01238 static void GetAcceptedCargo_TunnelBridge(TileIndex tile, AcceptedCargo ac)
01239 {
01240   /* not used */
01241 }
01242 
01243 static void GetTileDesc_TunnelBridge(TileIndex tile, TileDesc *td)
01244 {
01245   TransportType tt = GetTunnelBridgeTransportType(tile);
01246 
01247   if (IsTunnel(tile)) {
01248     td->str = (tt == TRANSPORT_RAIL) ? STR_5017_RAILROAD_TUNNEL : STR_5018_ROAD_TUNNEL;
01249   } else { // IsBridge(tile)
01250     td->str = (tt == TRANSPORT_WATER) ? STR_AQUEDUCT : GetBridgeSpec(GetBridgeType(tile))->transport_name[tt];
01251   }
01252   td->owner[0] = GetTileOwner(tile);
01253 
01254   Owner road_owner = INVALID_OWNER;
01255   Owner tram_owner = INVALID_OWNER;
01256   RoadTypes rts = GetRoadTypes(tile);
01257   if (HasBit(rts, ROADTYPE_ROAD)) road_owner = GetRoadOwner(tile, ROADTYPE_ROAD);
01258   if (HasBit(rts, ROADTYPE_TRAM)) tram_owner = GetRoadOwner(tile, ROADTYPE_TRAM);
01259 
01260   /* Is there a mix of owners? */
01261   if ((tram_owner != INVALID_OWNER && tram_owner != td->owner[0]) ||
01262       (road_owner != INVALID_OWNER && road_owner != td->owner[0])) {
01263     uint i = 1;
01264     if (road_owner != INVALID_OWNER) {
01265       td->owner_type[i] = STR_ROAD_OWNER;
01266       td->owner[i] = road_owner;
01267       i++;
01268     }
01269     if (tram_owner != INVALID_OWNER) {
01270       td->owner_type[i] = STR_TRAM_OWNER;
01271       td->owner[i] = tram_owner;
01272     }
01273   }
01274 }
01275 
01276 
01277 static void AnimateTile_TunnelBridge(TileIndex tile)
01278 {
01279   /* not used */
01280 }
01281 
01282 static void TileLoop_TunnelBridge(TileIndex tile)
01283 {
01284   bool snow_or_desert = HasTunnelBridgeSnowOrDesert(tile);
01285   switch (_settings_game.game_creation.landscape) {
01286     case LT_ARCTIC:
01287       if (snow_or_desert != (GetTileZ(tile) > GetSnowLine())) {
01288         SetTunnelBridgeSnowOrDesert(tile, !snow_or_desert);
01289         MarkTileDirtyByTile(tile);
01290       }
01291       break;
01292 
01293     case LT_TROPIC:
01294       if (GetTropicZone(tile) == TROPICZONE_DESERT && !snow_or_desert) {
01295         SetTunnelBridgeSnowOrDesert(tile, true);
01296         MarkTileDirtyByTile(tile);
01297       }
01298       break;
01299 
01300     default:
01301       break;
01302   }
01303 }
01304 
01305 static bool ClickTile_TunnelBridge(TileIndex tile)
01306 {
01307   /* not used */
01308   return false;
01309 }
01310 
01311 
01312 static TrackStatus GetTileTrackStatus_TunnelBridge(TileIndex tile, TransportType mode, uint sub_mode, DiagDirection side)
01313 {
01314   TransportType transport_type = GetTunnelBridgeTransportType(tile);
01315   if (transport_type != mode || (transport_type == TRANSPORT_ROAD && (GetRoadTypes(tile) & sub_mode) == 0)) return 0;
01316 
01317   DiagDirection dir = GetTunnelBridgeDirection(tile);
01318   if (side != INVALID_DIAGDIR && side != ReverseDiagDir(dir)) return 0;
01319   return CombineTrackStatus(TrackBitsToTrackdirBits(DiagDirToDiagTrackBits(dir)), TRACKDIR_BIT_NONE);
01320 }
01321 
01322 static void ChangeTileOwner_TunnelBridge(TileIndex tile, Owner old_owner, Owner new_owner)
01323 {
01324   for (RoadType rt = ROADTYPE_ROAD; rt < ROADTYPE_END; rt++) {
01325     /* Update all roadtypes, no matter if they are present */
01326     if (GetRoadOwner(tile, rt) == old_owner) {
01327       SetRoadOwner(tile, rt, new_owner == INVALID_OWNER ? OWNER_NONE : new_owner);
01328     }
01329   }
01330 
01331   if (!IsTileOwner(tile, old_owner)) return;
01332 
01333   if (new_owner != INVALID_OWNER) {
01334     SetTileOwner(tile, new_owner);
01335   } else {
01336     if (CmdFailed(DoCommand(tile, 0, 0, DC_EXEC | DC_BANKRUPT, CMD_LANDSCAPE_CLEAR))) {
01337       /* When clearing the bridge/tunnel failed there are still vehicles on/in
01338        * the bridge/tunnel. As all *our* vehicles are already removed, they
01339        * must be of another owner. Therefore this can't be rail tunnel/bridge.
01340        * In that case we can safely reassign the ownership to OWNER_NONE. */
01341       assert(GetTunnelBridgeTransportType(tile) != TRANSPORT_RAIL);
01342       SetTileOwner(tile, OWNER_NONE);
01343     }
01344   }
01345 }
01346 
01347 
01348 static const byte _tunnel_fractcoord_1[4]    = {0x8E, 0x18, 0x81, 0xE8};
01349 static const byte _tunnel_fractcoord_2[4]    = {0x81, 0x98, 0x87, 0x38};
01350 static const byte _tunnel_fractcoord_3[4]    = {0x82, 0x88, 0x86, 0x48};
01351 static const byte _exit_tunnel_track[4]      = {1, 2, 1, 2};
01352 
01354 static const Trackdir _road_exit_tunnel_state[DIAGDIR_END] = {
01355   TRACKDIR_X_SW, TRACKDIR_Y_NW, TRACKDIR_X_NE, TRACKDIR_Y_SE
01356 };
01357 static const byte _road_exit_tunnel_frame[4] = {2, 7, 9, 4};
01358 
01359 static const byte _tunnel_fractcoord_4[4]    = {0x52, 0x85, 0x98, 0x29};
01360 static const byte _tunnel_fractcoord_5[4]    = {0x92, 0x89, 0x58, 0x25};
01361 static const byte _tunnel_fractcoord_6[4]    = {0x92, 0x89, 0x56, 0x45};
01362 static const byte _tunnel_fractcoord_7[4]    = {0x52, 0x85, 0x96, 0x49};
01363 
01364 static VehicleEnterTileStatus VehicleEnter_TunnelBridge(Vehicle *v, TileIndex tile, int x, int y)
01365 {
01366   int z = GetSlopeZ(x, y) - v->z_pos;
01367 
01368   if (abs(z) > 2) return VETSB_CANNOT_ENTER;
01369   const DiagDirection dir = GetTunnelBridgeDirection(tile);
01370 
01371   if (IsTunnel(tile)) {
01372     byte fc;
01373     DiagDirection vdir;
01374 
01375     if (v->type == VEH_TRAIN) {
01376       fc = (x & 0xF) + (y << 4);
01377 
01378       vdir = DirToDiagDir(v->direction);
01379 
01380       if (v->u.rail.track != TRACK_BIT_WORMHOLE && dir == vdir) {
01381         if (IsFrontEngine(v) && fc == _tunnel_fractcoord_1[dir]) {
01382           if (!PlayVehicleSound(v, VSE_TUNNEL) && RailVehInfo(v->engine_type)->engclass == 0) {
01383             SndPlayVehicleFx(SND_05_TRAIN_THROUGH_TUNNEL, v);
01384           }
01385           return VETSB_CONTINUE;
01386         }
01387         if (fc == _tunnel_fractcoord_2[dir]) {
01388           v->tile = tile;
01389           v->u.rail.track = TRACK_BIT_WORMHOLE;
01390           v->vehstatus |= VS_HIDDEN;
01391           return VETSB_ENTERED_WORMHOLE;
01392         }
01393       }
01394 
01395       if (dir == ReverseDiagDir(vdir) && fc == _tunnel_fractcoord_3[dir] && z == 0) {
01396         /* We're at the tunnel exit ?? */
01397         v->tile = tile;
01398         v->u.rail.track = (TrackBits)_exit_tunnel_track[dir];
01399         assert(v->u.rail.track);
01400         v->vehstatus &= ~VS_HIDDEN;
01401         return VETSB_ENTERED_WORMHOLE;
01402       }
01403     } else if (v->type == VEH_ROAD) {
01404       fc = (x & 0xF) + (y << 4);
01405       vdir = DirToDiagDir(v->direction);
01406 
01407       /* Enter tunnel? */
01408       if (v->u.road.state != RVSB_WORMHOLE && dir == vdir) {
01409         if (fc == _tunnel_fractcoord_4[dir] ||
01410             fc == _tunnel_fractcoord_5[dir]) {
01411           v->tile = tile;
01412           v->u.road.state = RVSB_WORMHOLE;
01413           v->vehstatus |= VS_HIDDEN;
01414           return VETSB_ENTERED_WORMHOLE;
01415         } else {
01416           return VETSB_CONTINUE;
01417         }
01418       }
01419 
01420       if (dir == ReverseDiagDir(vdir) && (
01421             /* We're at the tunnel exit ?? */
01422             fc == _tunnel_fractcoord_6[dir] ||
01423             fc == _tunnel_fractcoord_7[dir]
01424           ) &&
01425           z == 0) {
01426         v->tile = tile;
01427         v->u.road.state = _road_exit_tunnel_state[dir];
01428         v->u.road.frame = _road_exit_tunnel_frame[dir];
01429         v->vehstatus &= ~VS_HIDDEN;
01430         return VETSB_ENTERED_WORMHOLE;
01431       }
01432     }
01433   } else { // IsBridge(tile)
01434 
01435     if (v->IsPrimaryVehicle() && v->type != VEH_SHIP) {
01436       /* modify speed of vehicle */
01437       uint16 spd = GetBridgeSpec(GetBridgeType(tile))->speed;
01438 
01439       if (v->type == VEH_ROAD) spd *= 2;
01440       if (v->cur_speed > spd) v->cur_speed = spd;
01441     }
01442 
01443     if (DirToDiagDir(v->direction) == dir) {
01444       switch (dir) {
01445         default: NOT_REACHED();
01446         case DIAGDIR_NE: if ((x & 0xF) != 0)             return VETSB_CONTINUE; break;
01447         case DIAGDIR_SE: if ((y & 0xF) != TILE_SIZE - 1) return VETSB_CONTINUE; break;
01448         case DIAGDIR_SW: if ((x & 0xF) != TILE_SIZE - 1) return VETSB_CONTINUE; break;
01449         case DIAGDIR_NW: if ((y & 0xF) != 0)             return VETSB_CONTINUE; break;
01450       }
01451       switch (v->type) {
01452         case VEH_TRAIN:
01453           v->u.rail.track = TRACK_BIT_WORMHOLE;
01454           ClrBit(v->u.rail.flags, VRF_GOINGUP);
01455           ClrBit(v->u.rail.flags, VRF_GOINGDOWN);
01456           break;
01457 
01458         case VEH_ROAD:
01459           v->u.road.state = RVSB_WORMHOLE;
01460           break;
01461 
01462         case VEH_SHIP:
01463           v->u.ship.state = TRACK_BIT_WORMHOLE;
01464           break;
01465 
01466         default: NOT_REACHED();
01467       }
01468       return VETSB_ENTERED_WORMHOLE;
01469     } else if (DirToDiagDir(v->direction) == ReverseDiagDir(dir)) {
01470       v->tile = tile;
01471       switch (v->type) {
01472         case VEH_TRAIN:
01473           if (v->u.rail.track == TRACK_BIT_WORMHOLE) {
01474             v->u.rail.track = (DiagDirToAxis(dir) == AXIS_X ? TRACK_BIT_X : TRACK_BIT_Y);
01475             return VETSB_ENTERED_WORMHOLE;
01476           }
01477           break;
01478 
01479         case VEH_ROAD:
01480           if (v->u.road.state == RVSB_WORMHOLE) {
01481             v->u.road.state = _road_exit_tunnel_state[dir];
01482             v->u.road.frame = 0;
01483             return VETSB_ENTERED_WORMHOLE;
01484           }
01485           break;
01486 
01487         case VEH_SHIP:
01488           if (v->u.ship.state == TRACK_BIT_WORMHOLE) {
01489             v->u.ship.state = (DiagDirToAxis(dir) == AXIS_X ? TRACK_BIT_X : TRACK_BIT_Y);
01490             return VETSB_ENTERED_WORMHOLE;
01491           }
01492           break;
01493 
01494         default: NOT_REACHED();
01495       }
01496     }
01497   }
01498   return VETSB_CONTINUE;
01499 }
01500 
01501 static CommandCost TerraformTile_TunnelBridge(TileIndex tile, DoCommandFlag flags, uint z_new, Slope tileh_new)
01502 {
01503   if (_settings_game.construction.build_on_slopes && AutoslopeEnabled() && IsBridge(tile) && GetTunnelBridgeTransportType(tile) != TRANSPORT_WATER) {
01504     DiagDirection direction = GetTunnelBridgeDirection(tile);
01505     Axis axis = DiagDirToAxis(direction);
01506     CommandCost res;
01507     uint z_old;
01508     Slope tileh_old = GetTileSlope(tile, &z_old);
01509 
01510     /* Check if new slope is valid for bridges in general (so we can safely call GetBridgeFoundation()) */
01511     if ((direction == DIAGDIR_NW) || (direction == DIAGDIR_NE)) {
01512       CheckBridgeSlopeSouth(axis, &tileh_old, &z_old);
01513       res = CheckBridgeSlopeSouth(axis, &tileh_new, &z_new);
01514     } else {
01515       CheckBridgeSlopeNorth(axis, &tileh_old, &z_old);
01516       res = CheckBridgeSlopeNorth(axis, &tileh_new, &z_new);
01517     }
01518 
01519     /* Surface slope is valid and remains unchanged? */
01520     if (!CmdFailed(res) && (z_old == z_new) && (tileh_old == tileh_new)) return CommandCost(EXPENSES_CONSTRUCTION, _price.terraform);
01521   }
01522 
01523   return DoCommand(tile, 0, 0, flags, CMD_LANDSCAPE_CLEAR);
01524 }
01525 
01526 extern const TileTypeProcs _tile_type_tunnelbridge_procs = {
01527   DrawTile_TunnelBridge,           /* draw_tile_proc */
01528   GetSlopeZ_TunnelBridge,          /* get_slope_z_proc */
01529   ClearTile_TunnelBridge,          /* clear_tile_proc */
01530   GetAcceptedCargo_TunnelBridge,   /* get_accepted_cargo_proc */
01531   GetTileDesc_TunnelBridge,        /* get_tile_desc_proc */
01532   GetTileTrackStatus_TunnelBridge, /* get_tile_track_status_proc */
01533   ClickTile_TunnelBridge,          /* click_tile_proc */
01534   AnimateTile_TunnelBridge,        /* animate_tile_proc */
01535   TileLoop_TunnelBridge,           /* tile_loop_clear */
01536   ChangeTileOwner_TunnelBridge,    /* change_tile_owner_clear */
01537   NULL,                            /* get_produced_cargo_proc */
01538   VehicleEnter_TunnelBridge,       /* vehicle_enter_tile_proc */
01539   GetFoundation_TunnelBridge,      /* get_foundation_proc */
01540   TerraformTile_TunnelBridge,      /* terraform_tile_proc */
01541 };

Generated on Mon Mar 9 23:33:52 2009 for openttd by  doxygen 1.5.6