/* * 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 tunnelbridge_map.h Functions that have tunnels and bridges in common */ #ifndef TUNNELBRIDGE_MAP_H #define TUNNELBRIDGE_MAP_H #include "bridge_map.h" #include "tunnel_map.h" /** * Get the direction pointing to the other end. * * Tunnel: Get the direction facing into the tunnel * Bridge: Get the direction pointing onto the bridge * @param t The tile to analyze * @pre IsTileType(t, MP_TUNNELBRIDGE) * @return the above mentioned direction */ static inline DiagDirection GetTunnelBridgeDirection(TileIndex t) { assert(IsTileType(t, MP_TUNNELBRIDGE)); return (DiagDirection)GB(_m[t].m5, 0, 2); } /** * Tunnel: Get the transport type of the tunnel (road or rail) * Bridge: Get the transport type of the bridge's ramp * @param t The tile to analyze * @pre IsTileType(t, MP_TUNNELBRIDGE) * @return the transport type in the tunnel/bridge */ static inline TransportType GetTunnelBridgeTransportType(TileIndex t) { assert(IsTileType(t, MP_TUNNELBRIDGE)); return (TransportType)GB(_m[t].m5, 2, 2); } /** * Tunnel: Is this tunnel entrance in a snowy or desert area? * Bridge: Does the bridge ramp lie in a snow or desert area? * @param t The tile to analyze * @pre IsTileType(t, MP_TUNNELBRIDGE) * @return true if and only if the tile is in a snowy/desert area */ static inline bool HasTunnelBridgeSnowOrDesert(TileIndex t) { assert(IsTileType(t, MP_TUNNELBRIDGE)); return HasBit(_me[t].m7, 5); } /** * Tunnel: Places this tunnel entrance in a snowy or desert area, or takes it out of there. * Bridge: Sets whether the bridge ramp lies in a snow or desert area. * @param t the tunnel entrance / bridge ramp tile * @param snow_or_desert is the entrance/ramp in snow or desert (true), when * not in snow and not in desert false * @pre IsTileType(t, MP_TUNNELBRIDGE) */ static inline void SetTunnelBridgeSnowOrDesert(TileIndex t, bool snow_or_desert) { assert(IsTileType(t, MP_TUNNELBRIDGE)); SB(_me[t].m7, 5, 1, snow_or_desert); } /** * Determines type of the wormhole and returns its other end * @param t one end * @pre IsTileType(t, MP_TUNNELBRIDGE) * @return other end */ static inline TileIndex GetOtherTunnelBridgeEnd(TileIndex t) { assert(IsTileType(t, MP_TUNNELBRIDGE)); return IsTunnel(t) ? GetOtherTunnelEnd(t) : GetOtherBridgeEnd(t); } /** * Get the reservation state of the rail tunnel/bridge * @pre IsTileType(t, MP_TUNNELBRIDGE) && GetTunnelBridgeTransportType(t) == TRANSPORT_RAIL * @param t the tile * @return reservation state */ static inline bool HasTunnelBridgeReservation(TileIndex t) { assert(IsTileType(t, MP_TUNNELBRIDGE)); assert(GetTunnelBridgeTransportType(t) == TRANSPORT_RAIL); return HasBit(_m[t].m5, 4); } /** * Set the reservation state of the rail tunnel/bridge * @pre IsTileType(t, MP_TUNNELBRIDGE) && GetTunnelBridgeTransportType(t) == TRANSPORT_RAIL * @param t the tile * @param b the reservation state */ static inline void SetTunnelBridgeReservation(TileIndex t, bool b) { assert(IsTileType(t, MP_TUNNELBRIDGE)); assert(GetTunnelBridgeTransportType(t) == TRANSPORT_RAIL); SB(_m[t].m5, 4, 1, b ? 1 : 0); } /** * Get the reserved track bits for a rail tunnel/bridge * @pre IsTileType(t, MP_TUNNELBRIDGE) && GetTunnelBridgeTransportType(t) == TRANSPORT_RAIL * @param t the tile * @return reserved track bits */ static inline TrackBits GetTunnelBridgeReservationTrackBits(TileIndex t) { return HasTunnelBridgeReservation(t) ? DiagDirToDiagTrackBits(GetTunnelBridgeDirection(t)) : TRACK_BIT_NONE; } #endif /* TUNNELBRIDGE_MAP_H */