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/* $Id$ */
#ifndef BRIDGE_MAP_H
#define BRIDGE_MAP_H
#include "direction.h"
#include "macros.h"
#include "map.h"
#include "rail.h"
#include "tile.h"
static inline bool IsBridgeRamp(TileIndex t)
{
return !HASBIT(_m[t].m5, 6);
}
static inline bool IsBridgeMiddle(TileIndex t)
{
return HASBIT(_m[t].m5, 6);
}
/**
* Determines which piece of a bridge is contained in the current tile
* @param tile The tile to analyze
* @return the piece
*/
static inline uint GetBridgePiece(TileIndex tile)
{
return GB(_m[tile].m2, 0, 4);
}
/**
* Determines the type of bridge on a tile
* @param tile The tile to analyze
* @return The bridge type
*/
static inline uint GetBridgeType(TileIndex tile)
{
return GB(_m[tile].m2, 4, 4);
}
/**
* Get the direction pointing onto the bridge
*/
static inline DiagDirection GetBridgeRampDirection(TileIndex t)
{
/* Heavy wizardry to convert the X/Y (bit 0) + N/S (bit 5) encoding of
* bridges to a DiagDirection
*/
return (DiagDirection)((6 - (_m[t].m5 >> 4 & 2) - (_m[t].m5 & 1)) % 4);
}
static inline Axis GetBridgeAxis(TileIndex t)
{
return (Axis)GB(_m[t].m5, 0, 1);
}
static inline bool IsClearUnderBridge(TileIndex t)
{
return GB(_m[t].m5, 3, 3) == 0;
}
static inline bool IsWaterUnderBridge(TileIndex t)
{
return GB(_m[t].m5, 3, 3) == 1;
}
static inline bool IsTransportUnderBridge(TileIndex t)
{
return HASBIT(_m[t].m5, 5);
}
static inline TransportType GetTransportTypeUnderBridge(TileIndex t)
{
return (TransportType)GB(_m[t].m5, 3, 2);
}
/**
* Finds the end of a bridge in the specified direction starting at a middle tile
*/
TileIndex GetBridgeEnd(TileIndex, DiagDirection);
/**
* Finds the southern end of a bridge starting at a middle tile
*/
TileIndex GetSouthernBridgeEnd(TileIndex t);
/**
* Starting at one bridge end finds the other bridge end
*/
TileIndex GetOtherBridgeEnd(TileIndex);
static inline void SetClearUnderBridge(TileIndex t)
{
SetTileOwner(t, OWNER_NONE);
SB(_m[t].m5, 3, 3, 0 << 2 | 0);
}
static inline void SetWaterUnderBridge(TileIndex t)
{
SetTileOwner(t, OWNER_WATER);
SB(_m[t].m5, 3, 3, 0 << 2 | 1);
}
static inline void SetRailUnderBridge(TileIndex t, Owner o, RailType r)
{
SetTileOwner(t, o);
SB(_m[t].m5, 3, 3, 1 << 2 | TRANSPORT_RAIL);
SB(_m[t].m3, 0, 4, r);
}
static inline void SetRoadUnderBridge(TileIndex t, Owner o)
{
SetTileOwner(t, o);
SB(_m[t].m5, 3, 3, 1 << 2 | TRANSPORT_ROAD);
}
static inline void MakeBridgeRamp(TileIndex t, Owner o, uint bridgetype, DiagDirection d, TransportType tt)
{
uint northsouth = (d == DIAGDIR_NE || d == DIAGDIR_NW);
SetTileType(t, MP_TUNNELBRIDGE);
SetTileOwner(t, o);
_m[t].m2 = bridgetype << 4;
_m[t].m4 = 0;
_m[t].m5 = 1 << 7 | 0 << 6 | northsouth << 5 | tt << 1 | DiagDirToAxis(d);
}
static inline void MakeRoadBridgeRamp(TileIndex t, Owner o, uint bridgetype, DiagDirection d)
{
MakeBridgeRamp(t, o, bridgetype, d, TRANSPORT_ROAD);
_m[t].m3 = 0;
}
static inline void MakeRailBridgeRamp(TileIndex t, Owner o, uint bridgetype, DiagDirection d, RailType r)
{
MakeBridgeRamp(t, o, bridgetype, d, TRANSPORT_RAIL);
_m[t].m3 = r;
}
static inline void MakeBridgeMiddle(TileIndex t, uint bridgetype, uint piece, Axis a, TransportType tt)
{
SetTileType(t, MP_TUNNELBRIDGE);
SetTileOwner(t, OWNER_NONE);
_m[t].m2 = bridgetype << 4 | piece;
_m[t].m3 = 0;
_m[t].m4 = 0;
_m[t].m5 = 1 << 7 | 1 << 6 | 0 << 5 | 0 << 3 | tt << 1 | a;
}
static inline void MakeRoadBridgeMiddle(TileIndex t, uint bridgetype, uint piece, Axis a)
{
MakeBridgeMiddle(t, bridgetype, piece, a, TRANSPORT_ROAD);
}
static inline void MakeRailBridgeMiddle(TileIndex t, uint bridgetype, uint piece, Axis a, RailType r)
{
MakeBridgeMiddle(t, bridgetype, piece, a, TRANSPORT_RAIL);
SB(_m[t].m3, 4, 4, r);
}
#endif
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