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
  22 struct RoadVehicle;
  23
  24 /** Road vehicle states */
  25 enum RoadVehicleStates {
  26         /*
  27          * Lower 4 bits are used for vehicle track direction. (Trackdirs)
  28          * When in a road stop (bit 5 or bit 6 set) these bits give the
  29          * track direction of the entry to the road stop.
  30          * As the entry direction will always be a diagonal
  31          * direction (X_NE, Y_SE, X_SW or Y_NW) only bits 0 and 3
  32          * are needed to hold this direction. Bit 1 is then used to show
  33          * that the vehicle is using the second road stop bay.
  34          * Bit 2 is then used for drive-through stops to show the vehicle
  35          * is stopping at this road stop.
  36          */
  37
  38         /* Numeric values */
  39         RVSB_IN_DEPOT                = 0xFE,                      ///< The vehicle is in a depot
  40         RVSB_WORMHOLE                = 0xFF,                      ///< The vehicle is in a tunnel and/or bridge
  41
  42         /* Bit numbers */
  43         RVS_USING_SECOND_BAY         =    1,                      ///< Only used while in a road stop
  44         RVS_ENTERED_STOP             =    2,                      ///< Only set when a vehicle has entered the stop
  45         RVS_DRIVE_SIDE               =    4,                      ///< Only used when retrieving move data
  46         RVS_IN_ROAD_STOP             =    5,                      ///< The vehicle is in a road stop
  47         RVS_IN_DT_ROAD_STOP          =    6,                      ///< 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_DRIVE_SIDE              = 1 << RVS_DRIVE_SIDE,       ///< The vehicle is at the opposite side of the road
  56
  57         RVSB_TRACKDIR_MASK           = 0x0F,                      ///< The mask used to extract track dirs
  58         RVSB_ROAD_STOP_TRACKDIR_MASK = 0x09,                      ///< Only bits 0 and 3 are used to encode the trackdir for road stops
  59 };
  60
  61 /** State information about the Road Vehicle controller */
  62 static const uint RDE_NEXT_TILE = 0x80; ///< We should enter the next tile
  63 static const uint RDE_TURNED    = 0x40; ///< We just finished turning
  64
  65 /* Start frames for when a vehicle enters a tile/changes its state.
  66  * The start frame is different for vehicles that turned around or
  67  * are leaving the depot as the do not start at the edge of the tile.
  68  * For trams there are a few different start frames as there are two
  69  * places where trams can turn. */
  70 static const uint RVC_DEFAULT_START_FRAME                =  0;
  71 static const uint RVC_TURN_AROUND_START_FRAME            =  1;
  72 static const uint RVC_DEPOT_START_FRAME                  =  6;
  73 static const uint RVC_START_FRAME_AFTER_LONG_TRAM        = 21;
  74 static const uint RVC_TURN_AROUND_START_FRAME_SHORT_TRAM = 16;
  75 /* Stop frame for a vehicle in a drive-through stop */
  76 static const uint RVC_DRIVE_THROUGH_STOP_FRAME           = 11;
  77 static const uint RVC_DEPOT_STOP_FRAME                   = 11;
  78
  79 /** The number of ticks a vehicle has for overtaking. */
  80 static const byte RV_OVERTAKE_TIMEOUT = 35;
  81
  82 void RoadVehUpdateCache(RoadVehicle *v, bool same_length = false);
  83 void GetRoadVehSpriteSize(EngineID engine, uint &width, uint &height, int &xoffs, int &yoffs, EngineImageType image_type);
  84
  85 /**
  86  * Buses, trucks and trams belong to this class.
  87  */
  88 struct RoadVehicle FINAL : public GroundVehicle<RoadVehicle, VEH_ROAD> {
  89         byte state;             ///< @see RoadVehicleStates
  90         byte frame;
  91         uint16 blocked_ctr;
  92         byte overtaking;        ///< Set to #RVSB_DRIVE_SIDE when overtaking, otherwise 0.
  93         byte overtaking_ctr;    ///< The length of the current overtake attempt.
  94         uint16 crashed_ctr;     ///< Animation counter when the vehicle has crashed. @see RoadVehIsCrashed
  95         byte reverse_ctr;
  96
  97         RoadType roadtype;
  98         RoadTypes compatible_roadtypes;
  99
 100         /** We don't want GCC to zero our struct! It already is zeroed and has an index! */
 101         RoadVehicle() : GroundVehicleBase() {}
 102         /** We want to 'destruct' the right class. */
 103         virtual ~RoadVehicle() { this->PreDestructor(); }
 104
 105         friend struct GroundVehicle<RoadVehicle, VEH_ROAD>; // GroundVehicle needs to use the acceleration functions defined at RoadVehicle.
 106
 107         void MarkDirty();
 108         void UpdateDeltaXY(Direction direction);
 109         ExpensesType GetExpenseType(bool income) const { return income ? EXPENSES_ROADVEH_INC : EXPENSES_ROADVEH_RUN; }
 110         bool IsPrimaryVehicle() const { return this->IsFrontEngine(); }
 111         SpriteID GetImage(Direction direction, EngineImageType image_type) const;
 112         int GetDisplaySpeed() const { return this->gcache.last_speed / 2; }
 113         int GetDisplayMaxSpeed() const { return this->vcache.cached_max_speed / 2; }
 114         Money GetRunningCost() const;
 115         int GetDisplayImageWidth(Point *offset = NULL) const;
 116         bool IsInDepot() const { return this->state == RVSB_IN_DEPOT; }
 117         bool Tick();
 118         void OnNewDay();
 119         uint Crash(bool flooded = false);
 120         Trackdir GetVehicleTrackdir() const;
 121         TileIndex GetOrderStationLocation(StationID station);
 122         bool FindClosestDepot(TileIndex *location, DestinationID *destination, bool *reverse);
 123
 124         bool IsBus() const;
 125
 126         int GetCurrentMaxSpeed() const;
 127         int UpdateSpeed();
 128
 129 protected: // These functions should not be called outside acceleration code.
 130
 131         /**
 132          * Allows to know the power value that this vehicle will use.
 133          * @return Power value from the engine in HP, or zero if the vehicle is not powered.
 134          */
 135         inline uint16 GetPower() const
 136         {
 137                 /* Power is not added for articulated parts */
 138                 if (!this->IsArticulatedPart()) {
 139                         /* Road vehicle power is in units of 10 HP. */
 140                         return 10 * GetVehicleProperty(this, PROP_ROADVEH_POWER, RoadVehInfo(this->engine_type)->power);
 141                 }
 142                 return 0;
 143         }
 144
 145         /**
 146          * Returns a value if this articulated part is powered.
 147          * @return Zero, because road vehicles don't have powered parts.
 148          */
 149         inline uint16 GetPoweredPartPower(const RoadVehicle *head) const
 150         {
 151                 return 0;
 152         }
 153
 154         /**
 155          * Allows to know the weight value that this vehicle will use.
 156          * @return Weight value from the engine in tonnes.
 157          */
 158         inline uint16 GetWeight() const
 159         {
 160                 uint16 weight = (CargoSpec::Get(this->cargo_type)->weight * this->cargo.StoredCount()) / 16;
 161
 162                 /* Vehicle weight is not added for articulated parts. */
 163                 if (!this->IsArticulatedPart()) {
 164                         /* Road vehicle weight is in units of 1/4 t. */
 165                         weight += GetVehicleProperty(this, PROP_ROADVEH_WEIGHT, RoadVehInfo(this->engine_type)->weight) / 4;
 166                 }
 167
 168                 return weight;
 169         }
 170
 171         /**
 172          * Allows to know the tractive effort value that this vehicle will use.
 173          * @return Tractive effort value from the engine.
 174          */
 175         inline byte GetTractiveEffort() const
 176         {
 177                 /* The tractive effort coefficient is in units of 1/256.  */
 178                 return GetVehicleProperty(this, PROP_ROADVEH_TRACTIVE_EFFORT, RoadVehInfo(this->engine_type)->tractive_effort);
 179         }
 180
 181         /**
 182          * Gets the area used for calculating air drag.
 183          * @return Area of the engine in m^2.
 184          */
 185         inline byte GetAirDragArea() const
 186         {
 187                 return 6;
 188         }
 189
 190         /**
 191          * Gets the air drag coefficient of this vehicle.
 192          * @return Air drag value from the engine.
 193          */
 194         inline byte GetAirDrag() const
 195         {
 196                 return RoadVehInfo(this->engine_type)->air_drag;
 197         }
 198
 199         /**
 200          * Checks the current acceleration status of this vehicle.
 201          * @return Acceleration status.
 202          */
 203         inline AccelStatus GetAccelerationStatus() const
 204         {
 205                 return (this->vehstatus & VS_STOPPED) ? AS_BRAKE : AS_ACCEL;
 206         }
 207
 208         /**
 209          * Calculates the current speed of this vehicle.
 210          * @return Current speed in km/h-ish.
 211          */
 212         inline uint16 GetCurrentSpeed() const
 213         {
 214                 return this->cur_speed / 2;
 215         }
 216
 217         /**
 218          * Returns the rolling friction coefficient of this vehicle.
 219          * @return Rolling friction coefficient in [1e-4].
 220          */
 221         inline uint32 GetRollingFriction() const
 222         {
 223                 /* Trams have a slightly greater friction coefficient than trains.
 224                  * The rest of road vehicles have bigger values. */
 225                 uint32 coeff = (this->roadtype == ROADTYPE_TRAM) ? 40 : 75;
 226                 /* The friction coefficient increases with speed in a way that
 227                  * it doubles at 128 km/h, triples at 256 km/h and so on. */
 228                 return coeff * (128 + this->GetCurrentSpeed()) / 128;
 229         }
 230
 231         /**
 232          * Allows to know the acceleration type of a vehicle.
 233          * @return Zero, road vehicles always use a normal acceleration method.
 234          */
 235         inline int GetAccelerationType() const
 236         {
 237                 return 0;
 238         }
 239
 240         /**
 241          * Returns the slope steepness used by this vehicle.
 242          * @return Slope steepness used by the vehicle.
 243          */
 244         inline uint32 GetSlopeSteepness() const
 245         {
 246                 return _settings_game.vehicle.roadveh_slope_steepness;
 247         }
 248
 249         /**
 250          * Gets the maximum speed allowed by the track for this vehicle.
 251          * @return Since roads don't limit road vehicle speed, it returns always zero.
 252          */
 253         inline uint16 GetMaxTrackSpeed() const
 254         {
 255                 return 0;
 256         }
 257
 258         /**
 259          * Checks if the vehicle is at a tile that can be sloped.
 260          * @return True if the tile can be sloped.
 261          */
 262         inline bool TileMayHaveSlopedTrack() const
 263         {
 264                 TrackStatus ts = GetTileTrackStatus(this->tile, TRANSPORT_ROAD, this->compatible_roadtypes);
 265                 TrackBits trackbits = TrackStatusToTrackBits(ts);
 266
 267                 return trackbits == TRACK_BIT_X || trackbits == TRACK_BIT_Y;
 268         }
 269
 270         /**
 271          * Road vehicles have to use GetSlopePixelZ() to compute their height
 272          * if they are reversing because in that case, their direction
 273          * is not parallel with the road. It is safe to return \c true
 274          * even if it is not reversing.
 275          * @return are we (possibly) reversing?
 276          */
 277         inline bool HasToUseGetSlopePixelZ()
 278         {
 279                 const RoadVehicle *rv = this->First();
 280
 281                 /* Check if this vehicle is in the same direction as the road under.
 282                  * We already know it has either GVF_GOINGUP_BIT or GVF_GOINGDOWN_BIT set. */
 283
 284                 if (rv->state <= RVSB_TRACKDIR_MASK && IsReversingRoadTrackdir((Trackdir)rv->state)) {
 285                         /* If the first vehicle is reversing, this vehicle may be reversing too
 286                          * (especially if this is the first, and maybe the only, vehicle).*/
 287                         return true;
 288                 }
 289
 290                 while (rv != this) {
 291                         /* If any previous vehicle has different direction,
 292                          * we may be in the middle of reversing. */
 293                         if (this->direction != rv->direction) return true;
 294                         rv = rv->Next();
 295                 }
 296
 297                 return false;
 298         }
 299 };
 300
 301 #define FOR_ALL_ROADVEHICLES(var) FOR_ALL_VEHICLES_OF_TYPE(RoadVehicle, var)
 302
 303 #endif /* ROADVEH_H */