1 /* $Id$ */

     2 

     3 /** @file tunnelbridge_map.h Functions that have tunnels and bridges in common */

     4 

     5 #ifndef TUNNELBRIDGE_MAP_H

     6 #define TUNNELBRIDGE_MAP_H

     7 

     8 #include "direction.h"            /* DiagDirection */

     9 #include "core/bitmath_func.hpp"  /* GB, HasBit, SB */

    10 #include "map.h"                  /* Tile, TileIndex */

    11 #include "tile.h"                 /* TileType, IsTileType */

    12 #include "openttd.h"              /* TransportType */

    13 

    14 

    15 /**

    16  * Tunnel: Get the direction facing out of the tunnel

    17  * Bridge: Get the direction pointing onto the bridge

    18  * @param t The tile to analyze

    19  * @pre IsTileType(t, MP_TUNNELBRIDGE)

    20  * @return the above mentionned direction

    21  */

    22 static inline DiagDirection GetTunnelBridgeDirection(TileIndex t)

    23 {

    24 	assert(IsTileType(t, MP_TUNNELBRIDGE));

    25 	return (DiagDirection)GB(_m[t].m5, 0, 2);

    26 }

    27 

    28 /**

    29  * Tunnel: Get the transport type of the tunnel (road or rail)

    30  * Bridge: Get the transport type of the bridge's ramp

    31  * @param t The tile to analyze

    32  * @pre IsTileType(t, MP_TUNNELBRIDGE)

    33  * @return the transport type in the tunnel/bridge

    34  */

    35 static inline TransportType GetTunnelBridgeTransportType(TileIndex t)

    36 {

    37 	assert(IsTileType(t, MP_TUNNELBRIDGE));

    38 	return (TransportType)GB(_m[t].m5, 2, 2);

    39 }

    40 

    41 /**

    42  * Tunnel: Is this tunnel entrance in a snowy or desert area?

    43  * Bridge: Does the bridge ramp lie in a snow or desert area?

    44  * @param t The tile to analyze

    45  * @pre IsTileType(t, MP_TUNNELBRIDGE)

    46  * @return true if and only if the tile is in a snowy/desert area

    47  */

    48 static inline bool HasTunnelBridgeSnowOrDesert(TileIndex t)

    49 {

    50 	assert(IsTileType(t, MP_TUNNELBRIDGE));

    51 	return HasBit(_m[t].m4, 7);

    52 }

    53 

    54 /**

    55  * Tunnel: Places this tunnel entrance in a snowy or desert area, or takes it out of there.

    56  * Bridge: Sets whether the bridge ramp lies in a snow or desert area.

    57  * @param t the tunnel entrance / bridge ramp tile

    58  * @param snow_or_desert is the entrance/ramp in snow or desert (true), when

    59  *                       not in snow and not in desert false

    60  * @pre IsTileType(t, MP_TUNNELBRIDGE)

    61  */

    62 static inline void SetTunnelBridgeSnowOrDesert(TileIndex t, bool snow_or_desert)

    63 {

    64 	assert(IsTileType(t, MP_TUNNELBRIDGE));

    65 	SB(_m[t].m4, 7, 1, snow_or_desert);

    66 }

    67 

    68 #endif /* TUNNELBRIDGE_MAP_H */