# 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 */