# 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 */