road_func.h

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00001 /* $Id: road_func.h 19552 2010-04-03 19:57:23Z rubidium $ */
00002 
00003 /*
00004  * This file is part of OpenTTD.
00005  * 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.
00006  * 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.
00007  * 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/>.
00008  */
00009 
00012 #ifndef ROAD_FUNC_H
00013 #define ROAD_FUNC_H
00014 
00015 #include "core/bitmath_func.hpp"
00016 #include "road_type.h"
00017 #include "direction_type.h"
00018 #include "company_type.h"
00019 #include "tile_type.h"
00020 
00026 static inline bool IsValidRoadType(RoadType rt)
00027 {
00028   return rt == ROADTYPE_ROAD || rt == ROADTYPE_TRAM;
00029 }
00030 
00037 static inline RoadTypes RoadTypeToRoadTypes(RoadType rt)
00038 {
00039   return (RoadTypes)(1 << rt);
00040 }
00041 
00051 static inline RoadTypes ComplementRoadTypes(RoadTypes r)
00052 {
00053   return (RoadTypes)(ROADTYPES_ALL ^ r);
00054 }
00055 
00056 
00066 static inline RoadBits ComplementRoadBits(RoadBits r)
00067 {
00068   return (RoadBits)(ROAD_ALL ^ r);
00069 }
00070 
00079 static inline RoadBits MirrorRoadBits(RoadBits r)
00080 {
00081   return (RoadBits)(GB(r, 0, 2) << 2 | GB(r, 2, 2));
00082 }
00083 
00093 static inline RoadBits RotateRoadBits(RoadBits r, DiagDirDiff rot)
00094 {
00095   for (; rot > (DiagDirDiff)0; rot--) {
00096     r = (RoadBits)(GB(r, 0, 1) << 3 | GB(r, 1, 3));
00097   }
00098   return r;
00099 }
00100 
00107 static inline bool IsStraightRoad(RoadBits r)
00108 {
00109   return (r == ROAD_X || r == ROAD_Y);
00110 }
00111 
00121 static inline RoadBits DiagDirToRoadBits(DiagDirection d)
00122 {
00123   return (RoadBits)(ROAD_NW << (3 ^ d));
00124 }
00125 
00135 static inline RoadBits AxisToRoadBits(Axis a)
00136 {
00137   return a == AXIS_X ? ROAD_X : ROAD_Y;
00138 }
00139 
00146 bool HasRoadTypesAvail(const CompanyID company, const RoadTypes rts);
00147 
00153 bool ValParamRoadType(const RoadType rt);
00154 
00160 RoadTypes GetCompanyRoadtypes(const CompanyID company);
00161 
00162 void UpdateLevelCrossing(TileIndex tile, bool sound = true);
00163 
00164 #endif /* ROAD_FUNC_H */

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