src/rail.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 rail.h Rail specific functions. */
  11
  12 #ifndef RAIL_H
  13 #define RAIL_H
  14
  15 #include "rail_type.h"
  16 #include "track_type.h"
  17 #include "gfx_type.h"
  18 #include "core/bitmath_func.hpp"
  19 #include "economy_func.h"
  20 #include "slope_type.h"
  21 #include "strings_type.h"
  22 #include "date_type.h"
  23 #include "signal.h"
  24 #include "gfx_func.h"
  25
  26 /** Railtype flags. */
  27 enum RailTypeFlags {
  28         RTF_CATENARY          = 0,                           ///< Bit number for drawing a catenary.
  29         RTF_NO_LEVEL_CROSSING = 1,                           ///< Bit number for disallowing level crossings.
  30
  31         RTFB_NONE              = 0,                          ///< All flags cleared.
  32         RTFB_CATENARY          = 1 << RTF_CATENARY,          ///< Value for drawing a catenary.
  33         RTFB_NO_LEVEL_CROSSING = 1 << RTF_NO_LEVEL_CROSSING, ///< Value for disallowing level crossings.
  34 };
  35 DECLARE_ENUM_AS_BIT_SET(RailTypeFlags)
  36
  37 struct SpriteGroup;
  38
  39 /** Sprite groups for a railtype. */
  40 enum RailTypeSpriteGroup {
  41         RTSG_CURSORS,     ///< Cursor and toolbar icon images
  42         RTSG_OVERLAY,     ///< Images for overlaying track
  43         RTSG_GROUND,      ///< Main group of ground images
  44         RTSG_TUNNEL,      ///< Main group of ground images for snow or desert
  45         RTSG_WIRES,       ///< Catenary wires
  46         RTSG_PYLONS,      ///< Catenary pylons
  47         RTSG_BRIDGE,      ///< Bridge surface images
  48         RTSG_CROSSING,    ///< Level crossing overlay images
  49         RTSG_DEPOT,       ///< Depot images
  50         RTSG_FENCES,      ///< Fence images
  51         RTSG_TUNNEL_PORTAL, ///< Tunnel portal overlay
  52         RTSG_SIGNALS,     ///< Signal images
  53         RTSG_END,
  54 };
  55
  56 /**
  57  * Offsets for sprites within an overlay/underlay set.
  58  * These are the same for overlay and underlay sprites.
  59  */
  60 enum RailTrackOffset {
  61         RTO_X,            ///< Piece of rail in X direction
  62         RTO_Y,            ///< Piece of rail in Y direction
  63         RTO_N,            ///< Piece of rail in northern corner
  64         RTO_S,            ///< Piece of rail in southern corner
  65         RTO_E,            ///< Piece of rail in eastern corner
  66         RTO_W,            ///< Piece of rail in western corner
  67         RTO_SLOPE_NE,     ///< Piece of rail on slope with north-east raised
  68         RTO_SLOPE_SE,     ///< Piece of rail on slope with south-east raised
  69         RTO_SLOPE_SW,     ///< Piece of rail on slope with south-west raised
  70         RTO_SLOPE_NW,     ///< Piece of rail on slope with north-west raised
  71         RTO_CROSSING_XY,  ///< Crossing of X and Y rail, with ballast
  72         RTO_JUNCTION_SW,  ///< Ballast for junction 'pointing' SW
  73         RTO_JUNCTION_NE,  ///< Ballast for junction 'pointing' NE
  74         RTO_JUNCTION_SE,  ///< Ballast for junction 'pointing' SE
  75         RTO_JUNCTION_NW,  ///< Ballast for junction 'pointing' NW
  76         RTO_JUNCTION_NSEW,///< Ballast for full junction
  77 };
  78
  79 /**
  80  * Offsets for sprites within a bridge surface overlay set.
  81  */
  82 enum RailTrackBridgeOffset {
  83         RTBO_X,     ///< Piece of rail in X direction
  84         RTBO_Y,     ///< Piece of rail in Y direction
  85         RTBO_SLOPE, ///< Sloped rail pieces, in order NE, SE, SW, NW
  86 };
  87
  88 /**
  89  * Offsets from base sprite for fence sprites. These are in the order of
  90  *  the sprites in the original data files.
  91  */
  92 enum RailFenceOffset {
  93         RFO_FLAT_X_NW,     //!< Slope FLAT, Track X,     Fence NW
  94         RFO_FLAT_Y_NE,     //!< Slope FLAT, Track Y,     Fence NE
  95         RFO_FLAT_LEFT,     //!< Slope FLAT, Track LEFT,  Fence E
  96         RFO_FLAT_UPPER,    //!< Slope FLAT, Track UPPER, Fence S
  97         RFO_SLOPE_SW_NW,   //!< Slope SW,   Track X,     Fence NW
  98         RFO_SLOPE_SE_NE,   //!< Slope SE,   Track Y,     Fence NE
  99         RFO_SLOPE_NE_NW,   //!< Slope NE,   Track X,     Fence NW
 100         RFO_SLOPE_NW_NE,   //!< Slope NW,   Track Y,     Fence NE
 101         RFO_FLAT_X_SE,     //!< Slope FLAT, Track X,     Fence SE
 102         RFO_FLAT_Y_SW,     //!< Slope FLAT, Track Y,     Fence SW
 103         RFO_FLAT_RIGHT,    //!< Slope FLAT, Track RIGHT, Fence W
 104         RFO_FLAT_LOWER,    //!< Slope FLAT, Track LOWER, Fence N
 105         RFO_SLOPE_SW_SE,   //!< Slope SW,   Track X,     Fence SE
 106         RFO_SLOPE_SE_SW,   //!< Slope SE,   Track Y,     Fence SW
 107         RFO_SLOPE_NE_SE,   //!< Slope NE,   Track X,     Fence SE
 108         RFO_SLOPE_NW_SW,   //!< Slope NW,   Track Y,     Fence SW
 109 };
 110
 111 /** List of rail type labels. */
 112 typedef SmallVector<RailTypeLabel, 4> RailTypeLabelList;
 113
 114 /**
 115  * This struct contains all the info that is needed to draw and construct tracks.
 116  */
 117 class RailtypeInfo {
 118 public:
 119         /**
 120          * Struct containing the main sprites. @note not all sprites are listed, but only
 121          *  the ones used directly in the code
 122          */
 123         struct {
 124                 SpriteID track_y;      ///< single piece of rail in Y direction, with ground
 125                 SpriteID track_ns;     ///< two pieces of rail in North and South corner (East-West direction)
 126                 SpriteID ground;       ///< ground sprite for a 3-way switch
 127                 SpriteID single[TRACK_END]; ///< single piece of rail per track, without ground
 128                 SpriteID single_sloped;///< single piece of rail for slopes
 129                 SpriteID crossing;     ///< level crossing, rail in X direction
 130                 SpriteID tunnel;       ///< tunnel sprites base
 131         } base_sprites;
 132
 133         /**
 134          * struct containing the sprites for the rail GUI. @note only sprites referred to
 135          * directly in the code are listed
 136          */
 137         struct {
 138                 SpriteID build_ns_rail;      ///< button for building single rail in N-S direction
 139                 SpriteID build_x_rail;       ///< button for building single rail in X direction
 140                 SpriteID build_ew_rail;      ///< button for building single rail in E-W direction
 141                 SpriteID build_y_rail;       ///< button for building single rail in Y direction
 142                 SpriteID auto_rail;          ///< button for the autorail construction
 143                 SpriteID build_depot;        ///< button for building depots
 144                 SpriteID build_tunnel;       ///< button for building a tunnel
 145                 SpriteID convert_rail;       ///< button for converting rail
 146                 SpriteID signals[SIGTYPE_END][2][2]; ///< signal GUI sprites (type, variant, state)
 147         } gui_sprites;
 148
 149         struct {
 150                 CursorID rail_ns;    ///< Cursor for building rail in N-S direction
 151                 CursorID rail_swne;  ///< Cursor for building rail in X direction
 152                 CursorID rail_ew;    ///< Cursor for building rail in E-W direction
 153                 CursorID rail_nwse;  ///< Cursor for building rail in Y direction
 154                 CursorID autorail;   ///< Cursor for autorail tool
 155                 CursorID depot;      ///< Cursor for building a depot
 156                 CursorID tunnel;     ///< Cursor for building a tunnel
 157                 CursorID convert;    ///< Cursor for converting track
 158         } cursor;                    ///< Cursors associated with the rail type.
 159
 160         struct {
 161                 StringID name;            ///< Name of this rail type.
 162                 StringID toolbar_caption; ///< Caption in the construction toolbar GUI for this rail type.
 163                 StringID menu_text;       ///< Name of this rail type in the main toolbar dropdown.
 164                 StringID build_caption;   ///< Caption of the build vehicle GUI for this rail type.
 165                 StringID replace_text;    ///< Text used in the autoreplace GUI.
 166                 StringID new_loco;        ///< Name of an engine for this type of rail in the engine preview GUI.
 167         } strings;                        ///< Strings associated with the rail type.
 168
 169         /** sprite number difference between a piece of track on a snowy ground and the corresponding one on normal ground */
 170         SpriteID snow_offset;
 171
 172         /** bitmask to the OTHER railtypes on which an engine of THIS railtype generates power */
 173         RailTypes powered_railtypes;
 174
 175         /** bitmask to the OTHER railtypes on which an engine of THIS railtype can physically travel */
 176         RailTypes compatible_railtypes;
 177
 178         /**
 179          * Bridge offset
 180          */
 181         SpriteID bridge_offset;
 182
 183         /**
 184          * Original railtype number to use when drawing non-newgrf railtypes, or when drawing stations.
 185          */
 186         byte fallback_railtype;
 187
 188         /**
 189          * Multiplier for curve maximum speed advantage
 190          */
 191         byte curve_speed;
 192
 193         /**
 194          * Bit mask of rail type flags
 195          */
 196         RailTypeFlags flags;
 197
 198         /**
 199          * Cost multiplier for building this rail type
 200          */
 201         uint16 cost_multiplier;
 202
 203         /**
 204          * Cost multiplier for maintenance of this rail type
 205          */
 206         uint16 maintenance_multiplier;
 207
 208         /**
 209          * Acceleration type of this rail type
 210          */
 211         uint8 acceleration_type;
 212
 213         /**
 214          * Maximum speed for vehicles travelling on this rail type
 215          */
 216         uint16 max_speed;
 217
 218         /**
 219          * Unique 32 bit rail type identifier
 220          */
 221         RailTypeLabel label;
 222
 223         /**
 224          * Rail type labels this type provides in addition to the main label.
 225          */
 226         RailTypeLabelList alternate_labels;
 227
 228         /**
 229          * Colour on mini-map
 230          */
 231         byte map_colour;
 232
 233         /**
 234          * Introduction date.
 235          * When #INVALID_DATE or a vehicle using this railtype gets introduced earlier,
 236          * the vehicle's introduction date will be used instead for this railtype.
 237          * The introduction at this date is furthermore limited by the
 238          * #introduction_required_types.
 239          */
 240         Date introduction_date;
 241
 242         /**
 243          * Bitmask of railtypes that are required for this railtype to be introduced
 244          * at a given #introduction_date.
 245          */
 246         RailTypes introduction_required_railtypes;
 247
 248         /**
 249          * Bitmask of which other railtypes are introduced when this railtype is introduced.
 250          */
 251         RailTypes introduces_railtypes;
 252
 253         /**
 254          * The sorting order of this railtype for the toolbar dropdown.
 255          */
 256         byte sorting_order;
 257
 258         /**
 259          * NewGRF providing the Action3 for the railtype. NULL if not available.
 260          */
 261         const GRFFile *grffile[RTSG_END];
 262
 263         /**
 264          * Sprite groups for resolving sprites
 265          */
 266         const SpriteGroup *group[RTSG_END];
 267
 268         inline bool UsesOverlay() const
 269         {
 270                 return this->group[RTSG_GROUND] != NULL;
 271         }
 272
 273         /**
 274          * Offset between the current railtype and normal rail. This means that:<p>
 275          * 1) All the sprites in a railset MUST be in the same order. This order
 276          *    is determined by normal rail. Check sprites 1005 and following for this order<p>
 277          * 2) The position where the railtype is loaded must always be the same, otherwise
 278          *    the offset will fail.
 279          */
 280         inline uint GetRailtypeSpriteOffset() const
 281         {
 282                 return 82 * this->fallback_railtype;
 283         }
 284 };
 285
 286
 287 /**
 288  * Returns a pointer to the Railtype information for a given railtype
 289  * @param railtype the rail type which the information is requested for
 290  * @return The pointer to the RailtypeInfo
 291  */
 292 static inline const RailtypeInfo *GetRailTypeInfo(RailType railtype)
 293 {
 294         extern RailtypeInfo _railtypes[RAILTYPE_END];
 295         assert(railtype < RAILTYPE_END);
 296         return &_railtypes[railtype];
 297 }
 298
 299 /**
 300  * Checks if an engine of the given RailType can drive on a tile with a given
 301  * RailType. This would normally just be an equality check, but for electric
 302  * rails (which also support non-electric engines).
 303  * @return Whether the engine can drive on this tile.
 304  * @param  enginetype The RailType of the engine we are considering.
 305  * @param  tiletype   The RailType of the tile we are considering.
 306  */
 307 static inline bool IsCompatibleRail(RailType enginetype, RailType tiletype)
 308 {
 309         return HasBit(GetRailTypeInfo(enginetype)->compatible_railtypes, tiletype);
 310 }
 311
 312 /**
 313  * Checks if an engine of the given RailType got power on a tile with a given
 314  * RailType. This would normally just be an equality check, but for electric
 315  * rails (which also support non-electric engines).
 316  * @return Whether the engine got power on this tile.
 317  * @param  enginetype The RailType of the engine we are considering.
 318  * @param  tiletype   The RailType of the tile we are considering.
 319  */
 320 static inline bool HasPowerOnRail(RailType enginetype, RailType tiletype)
 321 {
 322         return HasBit(GetRailTypeInfo(enginetype)->powered_railtypes, tiletype);
 323 }
 324
 325 /**
 326  * Test if a RailType disallows build of level crossings.
 327  * @param rt The RailType to check.
 328  * @return Whether level crossings are not allowed.
 329  */
 330 static inline bool RailNoLevelCrossings(RailType rt)
 331 {
 332         return HasBit(GetRailTypeInfo(rt)->flags, RTF_NO_LEVEL_CROSSING);
 333 }
 334
 335 /**
 336  * Returns the cost of building the specified railtype.
 337  * @param railtype The railtype being built.
 338  * @return The cost multiplier.
 339  */
 340 static inline Money RailBuildCost(RailType railtype)
 341 {
 342         assert(railtype < RAILTYPE_END);
 343         return (_price[PR_BUILD_RAIL] * GetRailTypeInfo(railtype)->cost_multiplier) >> 3;
 344 }
 345
 346 /**
 347  * Returns the 'cost' of clearing the specified railtype.
 348  * @param railtype The railtype being removed.
 349  * @return The cost.
 350  */
 351 static inline Money RailClearCost(RailType railtype)
 352 {
 353         /* Clearing rail in fact earns money, but if the build cost is set
 354          * very low then a loophole exists where money can be made.
 355          * In this case we limit the removal earnings to 3/4s of the build
 356          * cost.
 357          */
 358         assert(railtype < RAILTYPE_END);
 359         return max(_price[PR_CLEAR_RAIL], -RailBuildCost(railtype) * 3 / 4);
 360 }
 361
 362 /**
 363  * Calculates the cost of rail conversion
 364  * @param from The railtype we are converting from
 365  * @param to   The railtype we are converting to
 366  * @return Cost per TrackBit
 367  */
 368 static inline Money RailConvertCost(RailType from, RailType to)
 369 {
 370         /* Get the costs for removing and building anew
 371          * A conversion can never be more costly */
 372         Money rebuildcost = RailBuildCost(to) + RailClearCost(from);
 373
 374         /* Conversion between somewhat compatible railtypes:
 375          * Pay 1/8 of the target rail cost (labour costs) and additionally any difference in the
 376          * build costs, if the target type is more expensive (material upgrade costs).
 377          * Upgrade can never be more expensive than re-building. */
 378         if (HasPowerOnRail(from, to) || HasPowerOnRail(to, from)) {
 379                 Money upgradecost = RailBuildCost(to) / 8 + max((Money)0, RailBuildCost(to) - RailBuildCost(from));
 380                 return min(upgradecost, rebuildcost);
 381         }
 382
 383         /* make the price the same as remove + build new type for rail types
 384          * which are not compatible in any way */
 385         return rebuildcost;
 386 }
 387
 388 /**
 389  * Calculates the maintenance cost of a number of track bits.
 390  * @param railtype The railtype to get the cost of.
 391  * @param num Number of track bits of this railtype.
 392  * @param total_num Total number of track bits of all railtypes.
 393  * @return Total cost.
 394  */
 395 static inline Money RailMaintenanceCost(RailType railtype, uint32 num, uint32 total_num)
 396 {
 397         assert(railtype < RAILTYPE_END);
 398         return (_price[PR_INFRASTRUCTURE_RAIL] * GetRailTypeInfo(railtype)->maintenance_multiplier * num * (1 + IntSqrt(total_num))) >> 11; // 4 bits fraction for the multiplier and 7 bits scaling.
 399 }
 400
 401 /**
 402  * Calculates the maintenance cost of a number of signals.
 403  * @param num Number of signals.
 404  * @return Total cost.
 405  */
 406 static inline Money SignalMaintenanceCost(uint32 num)
 407 {
 408         return (_price[PR_INFRASTRUCTURE_RAIL] * 15 * num * (1 + IntSqrt(num))) >> 8; // 1 bit fraction for the multiplier and 7 bits scaling.
 409 }
 410
 411 void DrawTrainDepotSprite (BlitArea *dpi, int x, int y, int image, RailType railtype);
 412 int TicksToLeaveDepot(const Train *v);
 413
 414 Foundation GetRailFoundation(Slope tileh, TrackBits bits);
 415
 416
 417 bool HasRailtypeAvail(const CompanyID company, const RailType railtype);
 418 bool ValParamRailtype(const RailType rail);
 419
 420 RailTypes AddDateIntroducedRailTypes(RailTypes current, Date date);
 421
 422 RailType GetBestRailtype(const CompanyID company);
 423 RailTypes GetCompanyRailtypes(const CompanyID c);
 424
 425 RailType GetRailTypeByLabel(RailTypeLabel label, bool allow_alternate_labels = true);
 426
 427 void ResetRailTypes();
 428 void InitRailTypes();
 429 RailType AllocateRailType(RailTypeLabel label);
 430
 431 extern RailType _sorted_railtypes[RAILTYPE_END];
 432 extern uint8 _sorted_railtypes_size;
 433
 434 /**
 435  * Loop header for iterating over railtypes, sorted by sortorder.
 436  * @param var Railtype.
 437  */
 438 #define FOR_ALL_SORTED_RAILTYPES(var) for (uint8 index = 0; index < _sorted_railtypes_size && (var = _sorted_railtypes[index], true) ; index++)
 439
 440 #endif /* RAIL_H */