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