src/roadveh.h

   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 src/roadveh.h Road vehicle states */
  11
  12 #ifndef ROADVEH_H
  13 #define ROADVEH_H
  14
  15 #include "ground_vehicle.hpp"
  16 #include "engine_base.h"
  17 #include "cargotype.h"
  18 #include "track_func.h"
  19 #include "road_type.h"
  20 #include "newgrf_engine.h"
  21 #include "pathfinder/pos.h"
  22
  23 struct RoadVehicle;
  24
  25 /** Road vehicle states */
  26 enum RoadVehicleStates {
  27         /*
  28          * Lower 4 bits are used for vehicle track direction. (Trackdirs)
  29          * When in a road stop (bit 4 or bit 5 set) these bits give the
  30          * track direction of the entry to the road stop.
  31          * As the entry direction will always be a diagonal
  32          * direction (X_NE, Y_SE, X_SW or Y_NW) only bits 0 and 3
  33          * are needed to hold this direction. Bit 1 is then used to show
  34          * that the vehicle is using the second road stop bay.
  35          * Bit 2 is then used for drive-through stops to show the vehicle
  36          * is stopping at this road stop.
  37          */
  38
  39         /* Numeric values */
  40         RVSB_IN_DEPOT                = 0xFE,                      ///< The vehicle is in a depot
  41         RVSB_WORMHOLE                = 0xFF,                      ///< The vehicle is in a tunnel and/or bridge
  42
  43         /* Bit numbers */
  44         RVS_USING_SECOND_BAY         =    1,                      ///< Only used while in a road stop
  45         RVS_ENTERED_STOP             =    2,                      ///< Only set when a vehicle has entered the stop
  46         RVS_IN_ROAD_STOP             =    4,                      ///< The vehicle is in a road stop
  47         RVS_IN_DT_ROAD_STOP          =    5,                      ///< The vehicle is in a drive-through road stop
  48
  49         /* Bit sets of the above specified bits */
  50         RVSB_IN_ROAD_STOP            = 1 << RVS_IN_ROAD_STOP,     ///< The vehicle is in a road stop
  51         RVSB_IN_ROAD_STOP_END        = RVSB_IN_ROAD_STOP + TRACKDIR_END,
  52         RVSB_IN_DT_ROAD_STOP         = 1 << RVS_IN_DT_ROAD_STOP,  ///< The vehicle is in a drive-through road stop
  53         RVSB_IN_DT_ROAD_STOP_END     = RVSB_IN_DT_ROAD_STOP + TRACKDIR_END,
  54
  55         RVSB_TRACKDIR_MASK           = 0x0F,                      ///< The mask used to extract track dirs
  56         RVSB_ROAD_STOP_TRACKDIR_MASK = 0x09,                      ///< Only bits 0 and 3 are used to encode the trackdir for road stops
  57 };
  58
  59 /** State information about the Road Vehicle controller */
  60 static const uint RDE_NEXT_TILE = 0x80; ///< We should enter the next tile
  61 static const uint RDE_TURNED    = 0x40; ///< We just finished turning
  62
  63 /* Start frames for when a vehicle enters a tile/changes its state.
  64  * The start frame is different for vehicles that turned around or
  65  * are leaving the depot as the do not start at the edge of the tile.
  66  * For trams there are a few different start frames as there are two
  67  * places where trams can turn. */
  68 static const uint RVC_DEFAULT_START_FRAME                =  0;
  69 static const uint RVC_SHORT_TURN_START_FRAME             = 16;
  70 static const uint RVC_LONG_TURN_START_FRAME              =  0;
  71 static const uint RVC_AFTER_TURN_START_FRAME             =  1;
  72 static const uint RVC_DEPOT_START_FRAME                  =  6;
  73 /* Stop frame for a vehicle in a drive-through stop */
  74 static const uint RVC_DRIVE_THROUGH_STOP_FRAME           = 11;
  75 static const uint RVC_DEPOT_STOP_FRAME                   = 11;
  76
  77 /** The number of ticks a vehicle has for overtaking. */
  78 static const byte RV_OVERTAKE_TIMEOUT = 35;
  79
  80 void RoadVehUpdateCache(RoadVehicle *v, bool same_length = false);
  81 void GetRoadVehSpriteSize(EngineID engine, uint &width, uint &height, int &xoffs, int &yoffs, EngineImageType image_type);
  82
  83 /**
  84  * Buses, trucks and trams belong to this class.
  85  */
  86 struct RoadVehicle FINAL : public GroundVehicle<RoadVehicle, VEH_ROAD> {
  87         byte state;             ///< @see RoadVehicleStates
  88         byte frame;
  89         uint16 blocked_ctr;
  90         byte overtaking;        ///< Set to 1 when overtaking, otherwise 0.
  91         byte overtaking_ctr;    ///< The length of the current overtake attempt.
  92         uint16 crashed_ctr;     ///< Animation counter when the vehicle has crashed. @see RoadVehIsCrashed
  93         byte reverse_ctr;
  94
  95         RoadType roadtype;
  96         RoadTypes compatible_roadtypes;
  97
  98         /** We don't want GCC to zero our struct! It already is zeroed and has an index! */
  99         RoadVehicle() : GroundVehicleBase() {}
 100         /** We want to 'destruct' the right class. */
 101         virtual ~RoadVehicle() { this->PreDestructor(); }
 102
 103         friend struct GroundVehicle<RoadVehicle, VEH_ROAD>; // GroundVehicle needs to use the acceleration functions defined at RoadVehicle.
 104
 105         void MarkDirty();
 106         void UpdateDeltaXY(Direction direction);
 107         ExpensesType GetExpenseType(bool income) const { return income ? EXPENSES_ROADVEH_INC : EXPENSES_ROADVEH_RUN; }
 108         bool IsPrimaryVehicle() const { return this->IsFrontEngine(); }
 109         SpriteID GetImage(Direction direction, EngineImageType image_type) const;
 110         int GetDisplaySpeed() const { return this->gcache.last_speed / 2; }
 111         int GetDisplayMaxSpeed() const { return this->vcache.cached_max_speed / 2; }
 112         Money GetRunningCost() const;
 113         int GetDisplayImageWidth(Point *offset = NULL) const;
 114         bool IsInDepot() const { return this->state == RVSB_IN_DEPOT; }
 115         bool Tick();
 116         void OnNewDay();
 117         uint Crash(bool flooded = false);
 118         RoadPathPos GetPos() const;
 119         TileIndex GetOrderStationLocation(StationID station);
 120         bool FindClosestDepot(TileIndex *location, DestinationID *destination, bool *reverse);
 121
 122         bool IsBus() const;
 123
 124         int GetCurrentMaxSpeed() const;
 125         int UpdateSpeed();
 126
 127 protected: // These functions should not be called outside acceleration code.
 128
 129         /**
 130          * Allows to know the power value that this vehicle will use.
 131          * @return Power value from the engine in HP, or zero if the vehicle is not powered.
 132          */
 133         inline uint16 GetPower() const
 134         {
 135                 /* Power is not added for articulated parts */
 136                 if (!this->IsArticulatedPart()) {
 137                         /* Road vehicle power is in units of 10 HP. */
 138                         return 10 * GetVehicleProperty(this, PROP_ROADVEH_POWER, RoadVehInfo(this->engine_type)->power);
 139                 }
 140                 return 0;
 141         }
 142
 143         /**
 144          * Returns a value if this articulated part is powered.
 145          * @return Zero, because road vehicles don't have powered parts.
 146          */
 147         inline uint16 GetPoweredPartPower(const RoadVehicle *head) const
 148         {
 149                 return 0;
 150         }
 151
 152         /**
 153          * Allows to know the weight value that this vehicle will use.
 154          * @return Weight value from the engine in tonnes.
 155          */
 156         inline uint16 GetWeight() const
 157         {
 158                 uint16 weight = (CargoSpec::Get(this->cargo_type)->weight * this->cargo.StoredCount()) / 16;
 159
 160                 /* Vehicle weight is not added for articulated parts. */
 161                 if (!this->IsArticulatedPart()) {
 162                         /* Road vehicle weight is in units of 1/4 t. */
 163                         weight += GetVehicleProperty(this, PROP_ROADVEH_WEIGHT, RoadVehInfo(this->engine_type)->weight) / 4;
 164                 }
 165
 166                 return weight;
 167         }
 168
 169         /**
 170          * Allows to know the tractive effort value that this vehicle will use.
 171          * @return Tractive effort value from the engine.
 172          */
 173         inline byte GetTractiveEffort() const
 174         {
 175                 /* The tractive effort coefficient is in units of 1/256.  */
 176                 return GetVehicleProperty(this, PROP_ROADVEH_TRACTIVE_EFFORT, RoadVehInfo(this->engine_type)->tractive_effort);
 177         }
 178
 179         /**
 180          * Gets the area used for calculating air drag.
 181          * @return Area of the engine in m^2.
 182          */
 183         inline byte GetAirDragArea() const
 184         {
 185                 return 6;
 186         }
 187
 188         /**
 189          * Gets the air drag coefficient of this vehicle.
 190          * @return Air drag value from the engine.
 191          */
 192         inline byte GetAirDrag() const
 193         {
 194                 return RoadVehInfo(this->engine_type)->air_drag;
 195         }
 196
 197         /**
 198          * Checks the current acceleration status of this vehicle.
 199          * @return Acceleration status.
 200          */
 201         inline AccelStatus GetAccelerationStatus() const
 202         {
 203                 return (this->vehstatus & VS_STOPPED) ? AS_BRAKE : AS_ACCEL;
 204         }
 205
 206         /**
 207          * Calculates the current speed of this vehicle.
 208          * @return Current speed in km/h-ish.
 209          */
 210         inline uint16 GetCurrentSpeed() const
 211         {
 212                 return this->cur_speed / 2;
 213         }
 214
 215         /**
 216          * Returns the rolling friction coefficient of this vehicle.
 217          * @return Rolling friction coefficient in [1e-4].
 218          */
 219         inline uint32 GetRollingFriction() const
 220         {
 221                 /* Trams have a slightly greater friction coefficient than trains.
 222                  * The rest of road vehicles have bigger values. */
 223                 uint32 coeff = (this->roadtype == ROADTYPE_TRAM) ? 40 : 75;
 224                 /* The friction coefficient increases with speed in a way that
 225                  * it doubles at 128 km/h, triples at 256 km/h and so on. */
 226                 return coeff * (128 + this->GetCurrentSpeed()) / 128;
 227         }
 228
 229         /**
 230          * Allows to know the acceleration type of a vehicle.
 231          * @return Zero, road vehicles always use a normal acceleration method.
 232          */
 233         inline int GetAccelerationType() const
 234         {
 235                 return 0;
 236         }
 237
 238         /**
 239          * Returns the slope steepness used by this vehicle.
 240          * @return Slope steepness used by the vehicle.
 241          */
 242         inline uint32 GetSlopeSteepness() const
 243         {
 244                 return _settings_game.vehicle.roadveh_slope_steepness;
 245         }
 246
 247         /**
 248          * Gets the maximum speed allowed by the track for this vehicle.
 249          * @return Since roads don't limit road vehicle speed, it returns always zero.
 250          */
 251         inline uint16 GetMaxTrackSpeed() const
 252         {
 253                 return 0;
 254         }
 255
 256         /**
 257          * Checks if the vehicle is at a tile that can be sloped.
 258          * @return True if the tile can be sloped.
 259          */
 260         inline bool TileMayHaveSlopedTrack() const
 261         {
 262                 TrackStatus ts = GetTileRoadStatus(this->tile, this->compatible_roadtypes);
 263                 TrackBits trackbits = TrackStatusToTrackBits(ts);
 264
 265                 return trackbits == TRACK_BIT_X || trackbits == TRACK_BIT_Y;
 266         }
 267
 268         /**
 269          * Road vehicles have to use GetSlopePixelZ() to compute their height
 270          * if they are reversing because in that case, their direction
 271          * is not parallel with the road. It is safe to return \c true
 272          * even if it is not reversing.
 273          * @return are we (possibly) reversing?
 274          */
 275         inline bool HasToUseGetSlopePixelZ()
 276         {
 277                 const RoadVehicle *rv = this->First();
 278
 279                 /* Check if this vehicle is in the same direction as the road under.
 280                  * We already know it has either GVF_GOINGUP_BIT or GVF_GOINGDOWN_BIT set. */
 281
 282                 if (rv->state <= RVSB_TRACKDIR_MASK && IsReversingRoadTrackdir((Trackdir)rv->state)) {
 283                         /* If the first vehicle is reversing, this vehicle may be reversing too
 284                          * (especially if this is the first, and maybe the only, vehicle).*/
 285                         return true;
 286                 }
 287
 288                 while (rv != this) {
 289                         /* If any previous vehicle has different direction,
 290                          * we may be in the middle of reversing. */
 291                         if (this->direction != rv->direction) return true;
 292                         rv = rv->Next();
 293                 }
 294
 295                 return false;
 296         }
 297 };
 298
 299 #define FOR_ALL_ROADVEHICLES(var) FOR_ALL_VEHICLES_OF_TYPE(RoadVehicle, var)
 300
 301 #endif /* ROADVEH_H */