# road_func.h

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    00001 /* $Id$ */
    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
    00030 #define FOR_EACH_SET_ROADTYPE(var, road_types) FOR_EACH_SET_BIT_EX(RoadType, var, RoadTypes, road_types)
    00031
    00037 static inline bool IsValidRoadType(RoadType rt)
    00038 {
    00039   return rt == ROADTYPE_ROAD || rt == ROADTYPE_TRAM;
    00040 }
    00041
    00048 static inline RoadTypes RoadTypeToRoadTypes(RoadType rt)
    00049 {
    00050   return (RoadTypes)(1 << rt);
    00051 }
    00052
    00062 static inline RoadTypes ComplementRoadTypes(RoadTypes r)
    00063 {
    00064   return (RoadTypes)(ROADTYPES_ALL ^ r);
    00065 }
    00066
    00067
    00077 static inline RoadBits ComplementRoadBits(RoadBits r)
    00078 {
    00079   return (RoadBits)(ROAD_ALL ^ r);
    00080 }
    00081
    00090 static inline RoadBits MirrorRoadBits(RoadBits r)
    00091 {
    00092   return (RoadBits)(GB(r, 0, 2) << 2 | GB(r, 2, 2));
    00093 }
    00094
    00104 static inline RoadBits RotateRoadBits(RoadBits r, DiagDirDiff rot)
    00105 {
    00106   for (; rot > (DiagDirDiff)0; rot--) {
    00107     r = (RoadBits)(GB(r, 0, 1) << 3 | GB(r, 1, 3));
    00108   }
    00109   return r;
    00110 }
    00111
    00118 static inline bool IsStraightRoad(RoadBits r)
    00119 {
    00120   return (r == ROAD_X || r == ROAD_Y);
    00121 }
    00122
    00132 static inline RoadBits DiagDirToRoadBits(DiagDirection d)
    00133 {
    00134   return (RoadBits)(ROAD_NW << (3 ^ d));
    00135 }
    00136
    00146 static inline RoadBits AxisToRoadBits(Axis a)
    00147 {
    00148   return a == AXIS_X ? ROAD_X : ROAD_Y;
    00149 }
    00150
    00151 bool HasRoadTypesAvail(const CompanyID company, const RoadTypes rts);
    00152 bool ValParamRoadType(const RoadType rt);
    00153 RoadTypes GetCompanyRoadtypes(const CompanyID company);
    00154
    00155 void UpdateLevelCrossing(TileIndex tile, bool sound = true);
    00156
    00157 #endif /* ROAD_FUNC_H */