# 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 "economy_func.h"
    00018
    00028 #define FOR_EACH_SET_ROADTYPE(var, road_types) FOR_EACH_SET_BIT_EX(RoadType, var, RoadTypes, road_types)
    00029
    00035 static inline bool IsValidRoadType(RoadType rt)
    00036 {
    00037   return rt == ROADTYPE_ROAD || rt == ROADTYPE_TRAM;
    00038 }
    00039
    00046 static inline RoadTypes RoadTypeToRoadTypes(RoadType rt)
    00047 {
    00048   return (RoadTypes)(1 << rt);
    00049 }
    00050
    00059 static inline RoadTypes ComplementRoadTypes(RoadTypes r)
    00060 {
    00061   return (RoadTypes)(ROADTYPES_ALL ^ r);
    00062 }
    00063
    00064
    00074 static inline RoadBits ComplementRoadBits(RoadBits r)
    00075 {
    00076   return (RoadBits)(ROAD_ALL ^ r);
    00077 }
    00078
    00087 static inline RoadBits MirrorRoadBits(RoadBits r)
    00088 {
    00089   return (RoadBits)(GB(r, 0, 2) << 2 | GB(r, 2, 2));
    00090 }
    00091
    00101 static inline RoadBits RotateRoadBits(RoadBits r, DiagDirDiff rot)
    00102 {
    00103   for (; rot > (DiagDirDiff)0; rot--) {
    00104     r = (RoadBits)(GB(r, 0, 1) << 3 | GB(r, 1, 3));
    00105   }
    00106   return r;
    00107 }
    00108
    00115 static inline bool IsStraightRoad(RoadBits r)
    00116 {
    00117   return (r == ROAD_X || r == ROAD_Y);
    00118 }
    00119
    00129 static inline RoadBits DiagDirToRoadBits(DiagDirection d)
    00130 {
    00131   return (RoadBits)(ROAD_NW << (3 ^ d));
    00132 }
    00133
    00143 static inline RoadBits AxisToRoadBits(Axis a)
    00144 {
    00145   return a == AXIS_X ? ROAD_X : ROAD_Y;
    00146 }
    00147
    00148
    00155 static inline Money RoadMaintenanceCost(RoadType roadtype, uint32 num)
    00156 {
    00157   assert(roadtype < ROADTYPE_END);
    00158   return (_price[PR_INFRASTRUCTURE_ROAD] * (roadtype == ROADTYPE_TRAM ? 3 : 2) * num * (1 + IntSqrt(num))) >> 9; // 2 bits fraction for the multiplier and 7 bits scaling.
    00159 }
    00160
    00161 bool HasRoadTypesAvail(const CompanyID company, const RoadTypes rts);
    00162 bool ValParamRoadType(const RoadType rt);
    00163 RoadTypes GetCompanyRoadtypes(const CompanyID company);
    00164
    00165 void UpdateLevelCrossing(TileIndex tile, bool sound = true);
    00166
    00167 #endif /* ROAD_FUNC_H */