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(svn r17470) -Fix (r17460): possible crash when overbuiling rail by station
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/*
* This file is part of OpenTTD.
* OpenTTD is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, version 2.
* OpenTTD is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
* See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with OpenTTD. If not, see <http://www.gnu.org/licenses/>.
*/
/** @file ai_rail.hpp Everything to query and build rails. */
#ifndef AI_RAIL_HPP
#define AI_RAIL_HPP
#include "ai_object.hpp"
#include "ai_error.hpp"
#include "ai_tile.hpp"
/**
* Class that handles all rail related functions.
*/
class AIRail : public AIObject {
public:
static const char *GetClassName() { return "AIRail"; }
/**
* All rail related error messages.
*/
enum ErrorMessages {
/** Base for rail building / maintaining errors */
ERR_RAIL_BASE = AIError::ERR_CAT_RAIL << AIError::ERR_CAT_BIT_SIZE,
/** One-way roads cannot have crossings */
ERR_CROSSING_ON_ONEWAY_ROAD, // [STR_ERROR_CROSSING_ON_ONEWAY_ROAD]
/** Track not suitable for signals */
ERR_UNSUITABLE_TRACK, // [STR_ERROR_NO_SUITABLE_RAILROAD_TRACK]
/** Non-uniform stations is diabled */
ERR_NONUNIFORM_STATIONS_DISABLED, // [STR_ERROR_NONUNIFORM_STATIONS_DISALLOWED]
};
/**
* Types of rail known to the game.
*/
enum RailType {
/* Note: the values _are_ important as they represent an in-game value */
RAILTYPE_INVALID = 0xFF, //!< Invalid RailType.
};
/**
* A bitmap with all possible rail tracks on a tile.
*/
enum RailTrack {
/* Note: the values _are_ important as they represent an in-game value */
RAILTRACK_NE_SW = 1 << 0, //!< Track along the x-axis (north-east to south-west).
RAILTRACK_NW_SE = 1 << 1, //!< Track along the y-axis (north-west to south-east).
RAILTRACK_NW_NE = 1 << 2, //!< Track in the upper corner of the tile (north).
RAILTRACK_SW_SE = 1 << 3, //!< Track in the lower corner of the tile (south).
RAILTRACK_NW_SW = 1 << 4, //!< Track in the left corner of the tile (west).
RAILTRACK_NE_SE = 1 << 5, //!< Track in the right corner of the tile (east).
RAILTRACK_INVALID = 0xFF, //!< Flag for an invalid track.
};
/**
* Types of signal known to the game.
*/
enum SignalType {
/* Note: the values _are_ important as they represent an in-game value */
SIGNALTYPE_NORMAL = 0, //!< Normal signal.
SIGNALTYPE_ENTRY = 1, //!< Entry presignal.
SIGNALTYPE_EXIT = 2, //!< Exit signal.
SIGNALTYPE_COMBO = 3, //!< Combo signal.
SIGNALTYPE_PBS = 4, //!< Normal PBS signal.
SIGNALTYPE_PBS_ONEWAY = 5, //!< No-entry PBS signal.
SIGNALTYPE_TWOWAY = 8, //!< Bit mask for twoway signal.
SIGNALTYPE_NORMAL_TWOWAY = SIGNALTYPE_NORMAL | SIGNALTYPE_TWOWAY, //!< Normal twoway signal.
SIGNALTYPE_ENTRY_TWOWAY = SIGNALTYPE_ENTRY | SIGNALTYPE_TWOWAY, //!< Entry twoway signal.
SIGNALTYPE_EXIT_TWOWAY = SIGNALTYPE_EXIT | SIGNALTYPE_TWOWAY, //!< Exit twoway signal.
SIGNALTYPE_COMBO_TWOWAY = SIGNALTYPE_COMBO | SIGNALTYPE_TWOWAY, //!< Combo twoway signal.
SIGNALTYPE_NONE = 0xFF, //!< No signal.
};
/**
* Checks whether the given tile is actually a tile with rail that can be
* used to traverse a tile. This excludes rail depots but includes
* stations and waypoints.
* @param tile The tile to check.
* @pre AIMap::IsValidTile(tile).
* @return True if and only if the tile has rail.
*/
static bool IsRailTile(TileIndex tile);
/**
* Checks whether there is a road / rail crossing on a tile.
* @param tile The tile to check.
* @return True if and only if there is a road / rail crossing.
*/
static bool IsLevelCrossingTile(TileIndex tile);
/**
* Checks whether the given tile is actually a tile with a rail depot.
* @param tile The tile to check.
* @pre AIMap::IsValidTile(tile).
* @return True if and only if the tile has a rail depot.
*/
static bool IsRailDepotTile(TileIndex tile);
/**
* Checks whether the given tile is actually a tile with a rail station.
* @param tile The tile to check.
* @pre AIMap::IsValidTile(tile).
* @return True if and only if the tile has a rail station.
*/
static bool IsRailStationTile(TileIndex tile);
/**
* Checks whether the given tile is actually a tile with a rail waypoint.
* @param tile The tile to check.
* @pre AIMap::IsValidTile(tile).
* @return True if and only if the tile has a rail waypoint.
*/
static bool IsRailWaypointTile(TileIndex tile);
/**
* Check if a given RailType is available.
* @param rail_type The RailType to check for.
* @return True if this RailType can be used.
*/
static bool IsRailTypeAvailable(RailType rail_type);
/**
* Get the current RailType set for all AIRail functions.
* @return The RailType currently set.
*/
static RailType GetCurrentRailType();
/**
* Set the RailType for all further AIRail functions.
* @param rail_type The RailType to set.
*/
static void SetCurrentRailType(RailType rail_type);
/**
* Check if a train build for a rail type can run on another rail type.
* @param engine_rail_type The rail type the train is build for.
* @param track_rail_type The type you want to check.
* @pre AIRail::IsRailTypeAvailable(engine_rail_type).
* @pre AIRail::IsRailTypeAvailable(track_rail_type).
* @return Whether a train build for 'engine_rail_type' can run on 'track_rail_type'.
* @note Even if a train can run on a RailType that doesn't mean that it'll be
* able to power the train. Use TrainHasPowerOnRail for that.
*/
static bool TrainCanRunOnRail(AIRail::RailType engine_rail_type, AIRail::RailType track_rail_type);
/**
* Check if a train build for a rail type has power on another rail type.
* @param engine_rail_type The rail type the train is build for.
* @param track_rail_type The type you want to check.
* @pre AIRail::IsRailTypeAvailable(engine_rail_type).
* @pre AIRail::IsRailTypeAvailable(track_rail_type).
* @return Whether a train build for 'engine_rail_type' has power on 'track_rail_type'.
*/
static bool TrainHasPowerOnRail(AIRail::RailType engine_rail_type, AIRail::RailType track_rail_type);
/**
* Get the RailType that is used on a tile.
* @param tile The tile to check.
* @pre AITile::HasTransportType(tile, AITile.TRANSPORT_RAIL).
* @return The RailType that is used on a tile.
*/
static RailType GetRailType(TileIndex tile);
/**
* Convert the tracks on all tiles within a rectangle to another RailType.
* @param start_tile One corner of the rectangle.
* @param end_tile The opposite corner of the rectangle.
* @param convert_to The RailType you want to convert the rails to.
* @pre AIMap::IsValidTile(start_tile).
* @pre AIMap::IsValidTile(end_tile).
* @pre IsRailTypeAvailable(convert_to).
* @exception AIRail::ERR_UNSUITABLE_TRACK
* @return Whether at least some rail has been converted succesfully.
*/
static bool ConvertRailType(TileIndex start_tile, TileIndex end_tile, AIRail::RailType convert_to);
/**
* Gets the tile in front of a rail depot.
* @param depot The rail depot tile.
* @pre IsRailDepotTile(depot).
* @return The tile in front of the depot.
*/
static TileIndex GetRailDepotFrontTile(TileIndex depot);
/**
* Gets the direction of a rail station tile.
* @param tile The rail station tile.
* @pre IsRailStationTile(tile).
* @return The direction of the station (either RAILTRACK_NE_SW or RAILTRACK_NW_SE).
*/
static RailTrack GetRailStationDirection(TileIndex tile);
/**
* Builds a rail depot.
* @param tile Place to build the depot.
* @param front The tile exactly in front of the depot.
* @pre AIMap::IsValidTile(tile).
* @pre AIMap::IsValidTile(front).
* @pre 'tile' is not equal to 'front', but in a straight line of it.
* @pre IsRailTypeAvailable(GetCurrentRailType()).
* @exception AIError::ERR_FLAT_LAND_REQUIRED
* @exception AIError::ERR_AREA_NOT_CLEAR
* @return Whether the rail depot has been/can be build or not.
*/
static bool BuildRailDepot(TileIndex tile, TileIndex front);
/**
* Build a rail station.
* @param tile Place to build the station.
* @param direction The direction to build the station.
* @param num_platforms The number of platforms to build.
* @param platform_length The length of each platform.
* @param station_id The station to join, AIStation::STATION_NEW or AIStation::STATION_JOIN_ADJACENT.
* @pre IsRailTypeAvailable(GetCurrentRailType()).
* @pre AIMap::IsValidTile(tile).
* @pre direction == RAILTRACK_NW_SE || direction == RAILTRACK_NE_SW.
* @pre num_platforms > 0 && num_platforms <= 255.
* @pre platform_length > 0 && platform_length <= 255.
* @pre station_id == AIStation::STATION_NEW || station_id == AIStation::STATION_JOIN_ADJACENT || AIStation::IsValidStation(station_id).
* @exception AIError::ERR_OWNED_BY_ANOTHER_COMPANY
* @exception AIError::ERR_AREA_NOT_CLEAR
* @exception AIError::ERR_FLAT_LAND_REQUIRED
* @exception AIStation::ERR_STATION_TOO_CLOSE_TO_ANOTHER_STATION
* @exception AIStation::ERR_STATION_TOO_MANY_STATIONS
* @exception AIStation::ERR_STATION_TOO_MANY_STATIONS_IN_TOWN
* @return Whether the station has been/can be build or not.
*/
static bool BuildRailStation(TileIndex tile, RailTrack direction, uint num_platforms, uint platform_length, StationID station_id);
/**
* Build a NewGRF rail station. This calls callback 18 to let a NewGRF
* provide the station class / id to build, so we don't end up with
* only the default stations on the map.
* @param tile Place to build the station.
* @param direction The direction to build the station.
* @param num_platforms The number of platforms to build.
* @param platform_length The length of each platform.
* @param station_id The station to join, AIStation::STATION_NEW or AIStation::STATION_JOIN_ADJACENT.
* @param cargo_id The CargoID of the cargo that will be transported from / to this station.
* @param source_industry The IndustryType of the industry you'll transport goods from.
* @param goal_industry The IndustryType of the industry you'll transport goods to.
* @param distance The manhattan distance you'll transport the cargo over.
* @param source_station True if this is the source station, false otherwise.
* @pre IsRailTypeAvailable(GetCurrentRailType()).
* @pre AIMap::IsValidTile(tile).
* @pre direction == RAILTRACK_NW_SE || direction == RAILTRACK_NE_SW.
* @pre num_platforms > 0 && num_platforms <= 255.
* @pre platform_length > 0 && platform_length <= 255.
* @pre station_id == AIStation::STATION_NEW || station_id == AIStation::STATION_JOIN_ADJACENT || AIStation::IsValidStation(station_id).
* @exception AIError::ERR_OWNED_BY_ANOTHER_COMPANY
* @exception AIError::ERR_AREA_NOT_CLEAR
* @exception AIError::ERR_FLAT_LAND_REQUIRED
* @exception AIStation::ERR_STATION_TOO_CLOSE_TO_ANOTHER_STATION
* @exception AIStation::ERR_STATION_TOO_MANY_STATIONS
* @exception AIStation::ERR_STATION_TOO_MANY_STATIONS_IN_TOWN
* @return Whether the station has been/can be build or not.
*/
static bool BuildNewGRFRailStation(TileIndex tile, RailTrack direction, uint num_platforms, uint platform_length, StationID station_id, CargoID cargo_id, IndustryType source_industry, IndustryType goal_industry, int distance, bool source_station);
/**
* Build a rail waypoint.
* @param tile Place to build the waypoint.
* @pre AIMap::IsValidTile(tile).
* @pre IsRailTile(tile).
* @pre GetRailTracks(tile) == RAILTRACK_NE_SW || GetRailTracks(tile) == RAILTRACK_NW_SE.
* @pre IsRailTypeAvailable(GetCurrentRailType()).
* @exception AIError::ERR_FLAT_LAND_REQUIRED
* @return Whether the rail waypoint has been/can be build or not.
*/
static bool BuildRailWaypoint(TileIndex tile);
/**
* Remove a rail waypoint.
* @param tile Place to remove the waypoint from.
* @pre AIMap::IsValidTile(tile).
* @pre IsRailWaypointTile(tile).
* @return Whether the rail waypoint has been/can be removed or not.
*/
static bool RemoveRailWaypoint(TileIndex tile);
/**
* Remove all rail waypoint pieces within a rectangle on the map.
* @param tile One corner of the rectangle to clear.
* @param tile2 The oppposite corner.
* @pre IsValidTile(tile).
* @pre IsValidTile(tile2).
* @return Whether at least one tile has been/can be cleared or not.
*/
static bool RemoveRailWaypointTileRect(TileIndex tile, TileIndex tile2);
/**
* Remove all rail station platform pieces within a rectangle on the map.
* @param tile One corner of the rectangle to clear.
* @param tile2 The oppposite corner.
* @pre IsValidTile(tile).
* @pre IsValidTile(tile2).
* @return Whether at least one tile has been/can be cleared or not.
*/
static bool RemoveRailStationTileRect(TileIndex tile, TileIndex tile2);
/**
* Get all RailTracks on the given tile.
* @note A depot has no railtracks.
* @param tile The tile to check.
* @pre IsRailTile(tile).
* @return A bitmask of RailTrack with all RailTracks on the tile.
*/
static uint GetRailTracks(TileIndex tile);
/**
* Build rail on the given tile.
* @param tile The tile to build on.
* @param rail_track The RailTrack to build.
* @pre AIMap::IsValidTile(tile).
* @pre IsRailTypeAvailable(GetCurrentRailType()).
* @exception AIError::ERR_AREA_NOT_CLEAR
* @exception AIError::ERR_LAND_SLOPED_WRONG
* @exception AIRoad::ERR_ROAD_WORKS_IN_PROGRESS
* @exception AIRail::ERR_CROSSING_ON_ONEWAY_ROAD
* @exception AIError::ERR_ALREADY_BUILT
* @return Whether the rail has been/can be build or not.
* @note You can only build a single track with this function so do not
* use the values from RailTrack as bitmask.
*/
static bool BuildRailTrack(TileIndex tile, RailTrack rail_track);
/**
* Remove rail on the given tile.
* @param tile The tile to remove rail from.
* @param rail_track The RailTrack to remove.
* @pre AIMap::IsValidTile(tile).
* @pre (GetRailTracks(tile) & rail_track) != 0.
* @return Whether the rail has been/can be removed or not.
* @note You can only remove a single track with this function so do not
* use the values from RailTrack as bitmask.
*/
static bool RemoveRailTrack(TileIndex tile, RailTrack rail_track);
/**
* Check if a tile connects two adjacent tiles.
* @param from The first tile to connect.
* @param tile The tile that is checked.
* @param to The second tile to connect.
* @pre from != to.
* @pre AIMap::DistanceManhattan(from, tile) == 1.
* @pre AIMap::DistanceManhattan(to, tile) == 1.
* @return True if 'tile' connects 'from' and 'to'.
*/
static bool AreTilesConnected(TileIndex from, TileIndex tile, TileIndex to);
/**
* Build a rail connection between two tiles.
* @param from The tile just before the tile to build on.
* @param tile The first tile to build on.
* @param to The tile just after the last tile to build on.
* @pre from != to.
* @pre AIMap::DistanceManhattan(from, tile) == 1.
* @pre AIMap::DistanceManhattan(to, tile) >= 1.
* @pre (abs(abs(AIMap::GetTileX(to) - AIMap::GetTileX(tile)) -
* abs(AIMap::GetTileY(to) - AIMap::GetTileY(tile))) <= 1) ||
* (AIMap::GetTileX(from) == AIMap::GetTileX(tile) && AIMap::GetTileX(tile) == AIMap::GetTileX(to)) ||
* (AIMap::GetTileY(from) == AIMap::GetTileY(tile) && AIMap::GetTileY(tile) == AIMap::GetTileY(to)).
* @pre IsRailTypeAvailable(GetCurrentRailType()).
* @exception AIError::ERR_AREA_NOT_CLEAR
* @exception AIError::ERR_LAND_SLOPED_WRONG
* @exception AIRail::ERR_CROSSING_ON_ONEWAY_ROAD
* @exception AIRoad::ERR_ROAD_WORKS_IN_PROGRESS
* @exception AIError::ERR_ALREADY_BUILT
* @return Whether the rail has been/can be build or not.
*/
static bool BuildRail(TileIndex from, TileIndex tile, TileIndex to);
/**
* Remove a rail connection between two tiles.
* @param from The tile just before the tile to remove rail from.
* @param tile The first tile to remove rail from.
* @param to The tile just after the last tile to remove rail from.
* @pre from != to.
* @pre AIMap::DistanceManhattan(from, tile) == 1.
* @pre AIMap::DistanceManhattan(to, tile) >= 1.
* @pre (abs(abs(AIMap::GetTileX(to) - AIMap::GetTileX(tile)) -
* abs(AIMap::GetTileY(to) - AIMap::GetTileY(tile))) <= 1) ||
* (AIMap::GetTileX(from) == AIMap::GetTileX(tile) && AIMap::GetTileX(tile) == AIMap::GetTileX(to)) ||
* (AIMap::GetTileY(from) == AIMap::GetTileY(tile) && AIMap::GetTileY(tile) == AIMap::GetTileY(to)).
* @return Whether the rail has been/can be removed or not.
*/
static bool RemoveRail(TileIndex from, TileIndex tile, TileIndex to);
/**
* Get the SignalType of the signal on a tile or SIGNALTYPE_NONE if there is no signal.
* @pre AIMap::DistanceManhattan(tile, front) == 1.
* @param tile The tile that might have a signal.
* @param front The tile in front of 'tile'.
* @return The SignalType of the signal on 'tile' with it's front to 'front'.
*/
static SignalType GetSignalType(TileIndex tile, TileIndex front);
/**
* Build a signal on a tile.
* @param tile The tile to build on.
* @param front The tile in front of the signal.
* @param signal The SignalType to build.
* @pre AIMap::DistanceManhattan(tile, front) == 1.
* @pre IsRailTile(tile) && !IsRailStationTile(tile) && !IsRailWaypointTile(tile).
* @exception AIRail::ERR_UNSUITABLE_TRACK
* @return Whether the signal has been/can be build or not.
*/
static bool BuildSignal(TileIndex tile, TileIndex front, SignalType signal);
/**
* Remove a signal.
* @param tile The tile to remove the signal from.
* @param front The tile in front of the signal.
* @pre AIMap::DistanceManhattan(tile, front) == 1.
* @pre GetSignalType(tile, front) != SIGNALTYPE_NONE.
* @return Whether the signal has been/can be removed or not.
*/
static bool RemoveSignal(TileIndex tile, TileIndex front);
};
#endif /* AI_RAIL_HPP */
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