road_func.h

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00001 /* $Id: road_func.h 17248 2009-08-21 20:21:05Z 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_func.h"
00018 #include "company_type.h"
00019 
00025 static inline bool IsValidRoadType(RoadType rt)
00026 {
00027   return rt == ROADTYPE_ROAD || rt == ROADTYPE_TRAM;
00028 }
00029 
00035 static inline bool AreValidRoadTypes(RoadTypes rts)
00036 {
00037   return HasBit(rts, ROADTYPE_ROAD) || HasBit(rts, ROADTYPE_TRAM);
00038 }
00039 
00046 static inline RoadTypes RoadTypeToRoadTypes(RoadType rt)
00047 {
00048   return (RoadTypes)(1 << rt);
00049 }
00050 
00060 static inline RoadTypes ComplementRoadTypes(RoadTypes r)
00061 {
00062   return (RoadTypes)(ROADTYPES_ALL ^ r);
00063 }
00064 
00065 
00075 static inline RoadBits ComplementRoadBits(RoadBits r)
00076 {
00077   return (RoadBits)(ROAD_ALL ^ r);
00078 }
00079 
00088 static inline RoadBits MirrorRoadBits(RoadBits r)
00089 {
00090   return (RoadBits)(GB(r, 0, 2) << 2 | GB(r, 2, 2));
00091 }
00092 
00102 static inline RoadBits RotateRoadBits(RoadBits r, DiagDirDiff rot)
00103 {
00104   for (; rot > (DiagDirDiff)0; rot--) {
00105     r = (RoadBits)(GB(r, 0, 1) << 3 | GB(r, 1, 3));
00106   }
00107   return r;
00108 }
00109 
00116 static inline bool IsStraightRoad(RoadBits r)
00117 {
00118   return (r == ROAD_X || r == ROAD_Y);
00119 }
00120 
00130 static inline RoadBits DiagDirToRoadBits(DiagDirection d)
00131 {
00132   return (RoadBits)(ROAD_NW << (3 ^ d));
00133 }
00134 
00144 static inline RoadBits AxisToRoadBits(Axis a)
00145 {
00146   return a == AXIS_X ? ROAD_X : ROAD_Y;
00147 }
00148 
00155 bool HasRoadTypesAvail(const CompanyID company, const RoadTypes rts);
00156 
00162 bool ValParamRoadType(const RoadType rt);
00163 
00169 RoadTypes GetCompanyRoadtypes(const CompanyID company);
00170 
00171 void UpdateLevelCrossing(TileIndex tile, bool sound = true);
00172 
00173 #endif /* ROAD_FUNC_H */

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