src/road.cpp

   1 /* $Id$ */
   2
   3 /*
   4  * This file is part of OpenTTD.
   5  * 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.
   6  * 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.
   7  * 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/>.
   8  */
   9
  10 /** @file road.cpp Generic road related functions. */
  11
  12 #include "stdafx.h"
  13 #include "rail_map.h"
  14 #include "road_map.h"
  15 #include "water_map.h"
  16 #include "genworld.h"
  17 #include "company_func.h"
  18 #include "company_base.h"
  19 #include "engine_base.h"
  20 #include "date_func.h"
  21 #include "landscape.h"
  22
  23 /**
  24  * Return if the tile is a valid tile for a crossing.
  25  *
  26  * @param tile the curent tile
  27  * @param ax the axis of the road over the rail
  28  * @return true if it is a valid tile
  29  */
  30 static bool IsPossibleCrossing(const TileIndex tile, Axis ax)
  31 {
  32         return (IsTileType(tile, MP_RAILWAY) &&
  33                 GetRailTileType(tile) == RAIL_TILE_NORMAL &&
  34                 GetTrackBits(tile) == (ax == AXIS_X ? TRACK_BIT_Y : TRACK_BIT_X) &&
  35                 GetFoundationSlope(tile, NULL) == SLOPE_FLAT);
  36 }
  37
  38 /**
  39  * Clean up unneccesary RoadBits of a planed tile.
  40  * @param tile current tile
  41  * @param org_rb planed RoadBits
  42  * @return optimised RoadBits
  43  */
  44 RoadBits CleanUpRoadBits(const TileIndex tile, RoadBits org_rb)
  45 {
  46         if (!IsValidTile(tile)) return ROAD_NONE;
  47         for (DiagDirection dir = DIAGDIR_BEGIN; dir < DIAGDIR_END; dir++) {
  48                 const TileIndex neighbor_tile = TileAddByDiagDir(tile, dir);
  49
  50                 /* Get the Roadbit pointing to the neighbor_tile */
  51                 const RoadBits target_rb = DiagDirToRoadBits(dir);
  52
  53                 /* If the roadbit is in the current plan */
  54                 if (org_rb & target_rb) {
  55                         bool connective = false;
  56                         const RoadBits mirrored_rb = MirrorRoadBits(target_rb);
  57
  58                         switch (GetTileType(neighbor_tile)) {
  59                                 /* Allways connective ones */
  60                                 case MP_CLEAR: case MP_TREES:
  61                                         connective = true;
  62                                         break;
  63
  64                                 /* The conditionally connective ones */
  65                                 case MP_TUNNELBRIDGE:
  66                                 case MP_STATION:
  67                                 case MP_ROAD: {
  68                                         const RoadBits neighbor_rb = GetAnyRoadBits(neighbor_tile, ROADTYPE_ROAD) | GetAnyRoadBits(neighbor_tile, ROADTYPE_TRAM);
  69
  70                                         /* Accept only connective tiles */
  71                                         connective = (neighbor_rb & mirrored_rb) || // Neighbor has got the fitting RoadBit
  72                                                         HasExactlyOneBit(neighbor_rb); // Neighbor has got only one Roadbit
  73
  74                                         break;
  75                                 }
  76
  77                                 case MP_RAILWAY:
  78                                         connective = IsPossibleCrossing(neighbor_tile, DiagDirToAxis(dir));
  79                                         break;
  80
  81                                 case MP_WATER:
  82                                         /* Check for real water tile */
  83                                         connective = !IsWater(neighbor_tile);
  84                                         break;
  85
  86                                 /* The defentetly not connective ones */
  87                                 default: break;
  88                         }
  89
  90                         /* If the neighbor tile is inconnective remove the planed road connection to it */
  91                         if (!connective) org_rb ^= target_rb;
  92
  93                 }
  94         }
  95
  96         return org_rb;
  97 }
  98
  99 /**
 100  * Finds out, whether given company has all given RoadTypes available
 101  * @param company ID of company
 102  * @param rts RoadTypes to test
 103  * @return true if company has all requested RoadTypes available
 104  */
 105 bool HasRoadTypesAvail(const CompanyID company, const RoadTypes rts)
 106 {
 107         RoadTypes avail_roadtypes;
 108
 109         if (company == OWNER_TOWN || _game_mode == GM_EDITOR || _generating_world) {
 110                 avail_roadtypes = ROADTYPES_ROAD;
 111         } else {
 112                 Company *c = Company::GetIfValid(company);
 113                 if (c == NULL) return false;
 114                 avail_roadtypes = (RoadTypes)c->avail_roadtypes | ROADTYPES_ROAD; // road is available for always for everybody
 115         }
 116         return (rts & ~avail_roadtypes) == 0;
 117 }
 118
 119 /**
 120  * Validate functions for rail building.
 121  * @param rt road type to check.
 122  * @return true if the current company may build the road.
 123  */
 124 bool ValParamRoadType(const RoadType rt)
 125 {
 126         return HasRoadTypesAvail(_current_company, RoadTypeToRoadTypes(rt));
 127 }
 128
 129 /**
 130  * Get the road types the given company can build.
 131  * @param company the company to get the roadtypes for.
 132  * @return the road types.
 133  */
 134 RoadTypes GetCompanyRoadtypes(CompanyID company)
 135 {
 136         RoadTypes rt = ROADTYPES_NONE;
 137
 138         Engine *e;
 139         FOR_ALL_ENGINES_OF_TYPE(e, VEH_ROAD) {
 140                 const EngineInfo *ei = &e->info;
 141
 142                 if (HasBit(ei->climates, _settings_game.game_creation.landscape) &&
 143                                 (HasBit(e->company_avail, company) || _date >= e->intro_date + DAYS_IN_YEAR)) {
 144                         SetBit(rt, HasBit(ei->misc_flags, EF_ROAD_TRAM) ? ROADTYPE_TRAM : ROADTYPE_ROAD);
 145                 }
 146         }
 147
 148         return rt;
 149 }