src/newgrf_station.h

   1 /* $Id: newgrf_station.h 26085 2013-11-24 14:41:19Z frosch $ */
   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 newgrf_station.h Header file for NewGRF stations */
  11
  12 #ifndef NEWGRF_STATION_H
  13 #define NEWGRF_STATION_H
  14
  15 #include "newgrf_animation_type.h"
  16 #include "newgrf_callbacks.h"
  17 #include "newgrf_class.h"
  18 #include "newgrf_commons.h"
  19 #include "cargo_type.h"
  20 #include "station_type.h"
  21 #include "rail_type.h"
  22 #include "newgrf_spritegroup.h"
  23 #include "newgrf_town.h"
  24
  25 /** Scope resolver for stations. */
  26 struct StationScopeResolver : public ScopeResolver {
  27         TileIndex tile;                     ///< %Tile of the station.
  28         struct BaseStation *st;             ///< Instance of the station.
  29         const struct StationSpec *statspec; ///< Station (type) specification.
  30         CargoID cargo_type;                 ///< Type of cargo of the station.
  31         Axis axis;                          ///< Station axis, used only for the slope check callback.
  32
  33         /**
  34          * Constructor for station scopes.
  35          * @param ro Surrounding resolver.
  36          * @param statspec Station (type) specification.
  37          * @param st Instance of the station.
  38          * @param tile %Tile of the station.
  39          */
  40         StationScopeResolver(ResolverObject &ro, const StationSpec *statspec, BaseStation *st, TileIndex tile)
  41                 : ScopeResolver(ro), tile(tile), st(st), statspec(statspec), cargo_type(CT_INVALID), axis(INVALID_AXIS)
  42         {
  43         }
  44
  45         /* virtual */ uint32 GetRandomBits() const;
  46         /* virtual */ uint32 GetTriggers() const;
  47
  48         /* virtual */ uint32 GetVariable(byte variable, uint32 parameter, bool *available) const;
  49 };
  50
  51 /** Station resolver. */
  52 struct StationResolverObject : public ResolverObject {
  53         StationScopeResolver station_scope; ///< The station scope resolver.
  54         TownScopeResolver *town_scope;      ///< The town scope resolver (created on the first call).
  55
  56         StationResolverObject(const StationSpec *statspec, BaseStation *st, TileIndex tile,
  57                         CallbackID callback = CBID_NO_CALLBACK, uint32 callback_param1 = 0, uint32 callback_param2 = 0);
  58         ~StationResolverObject();
  59
  60         TownScopeResolver *GetTown();
  61
  62         /* virtual */ ScopeResolver *GetScope(VarSpriteGroupScope scope = VSG_SCOPE_SELF, byte relative = 0)
  63         {
  64                 switch (scope) {
  65                         case VSG_SCOPE_SELF:
  66                                 return &this->station_scope;
  67
  68                         case VSG_SCOPE_PARENT: {
  69                                 TownScopeResolver *tsr = this->GetTown();
  70                                 if (tsr != NULL) return tsr;
  71                         }
  72                         FALLTHROUGH;
  73
  74                         default:
  75                                 return ResolverObject::GetScope(scope, relative);
  76                 }
  77         }
  78
  79         /* virtual */ const SpriteGroup *ResolveReal(const RealSpriteGroup *group) const;
  80 };
  81
  82 enum StationClassID {
  83         STAT_CLASS_BEGIN = 0,    ///< the lowest valid value
  84         STAT_CLASS_DFLT = 0,     ///< Default station class.
  85         STAT_CLASS_WAYP,         ///< Waypoint class.
  86         STAT_CLASS_MAX = 256,    ///< Maximum number of classes.
  87 };
  88 typedef SimpleTinyEnumT<StationClassID, byte> StationClassIDByte;
  89 template <> struct EnumPropsT<StationClassID> : MakeEnumPropsT<StationClassID, byte, STAT_CLASS_BEGIN, STAT_CLASS_MAX, STAT_CLASS_MAX, 8> {};
  90
  91 /** Allow incrementing of StationClassID variables */
  92 DECLARE_POSTFIX_INCREMENT(StationClassID)
  93
  94 enum StationSpecFlags {
  95         SSF_SEPARATE_GROUND,      ///< Use different sprite set for ground sprites.
  96         SSF_DIV_BY_STATION_SIZE,  ///< Divide cargo amount by station size.
  97         SSF_CB141_RANDOM_BITS,    ///< Callback 141 needs random bits.
  98         SSF_CUSTOM_FOUNDATIONS,   ///< Draw custom foundations.
  99         SSF_EXTENDED_FOUNDATIONS, ///< Extended foundation block instead of simple.
 100 };
 101
 102 /** Randomisation triggers for stations */
 103 enum StationRandomTrigger {
 104         SRT_NEW_CARGO,        ///< Trigger station on new cargo arrival.
 105         SRT_CARGO_TAKEN,      ///< Trigger station when cargo is completely taken.
 106         SRT_TRAIN_ARRIVES,    ///< Trigger platform when train arrives.
 107         SRT_TRAIN_DEPARTS,    ///< Trigger platform when train leaves.
 108         SRT_TRAIN_LOADS,      ///< Trigger platform when train loads/unloads.
 109         SRT_PATH_RESERVATION, ///< Trigger platform when train reserves path.
 110 };
 111
 112 /* Station layout for given dimensions - it is a two-dimensional array
 113  * where index is computed as (x * platforms) + platform. */
 114 typedef byte *StationLayout;
 115
 116 /** Station specification. */
 117 struct StationSpec {
 118         /**
 119          * Properties related the the grf file.
 120          * NUM_CARGO real cargo plus three pseudo cargo sprite groups.
 121          * Used for obtaining the sprite offset of custom sprites, and for
 122          * evaluating callbacks.
 123          */
 124         GRFFilePropsBase<NUM_CARGO + 3> grf_prop;
 125         StationClassID cls_id;     ///< The class to which this spec belongs.
 126         StringID name;             ///< Name of this station.
 127
 128         /**
 129          * Bitmask of number of platforms available for the station.
 130          * 0..6 correspond to 1..7, while bit 7 corresponds to >7 platforms.
 131          */
 132         byte disallowed_platforms;
 133         /**
 134          * Bitmask of platform lengths available for the station.
 135          * 0..6 correspond to 1..7, while bit 7 corresponds to >7 tiles long.
 136          */
 137         byte disallowed_lengths;
 138
 139         /**
 140          * Number of tile layouts.
 141          * A minimum of 8 is required is required for stations.
 142          * 0-1 = plain platform
 143          * 2-3 = platform with building
 144          * 4-5 = platform with roof, left side
 145          * 6-7 = platform with roof, right side
 146          */
 147         uint tiles;
 148         NewGRFSpriteLayout *renderdata; ///< Array of tile layouts.
 149
 150         /**
 151          * Cargo threshold for choosing between little and lots of cargo
 152          * @note little/lots are equivalent to the moving/loading states for vehicles
 153          */
 154         uint16 cargo_threshold;
 155
 156         uint32 cargo_triggers; ///< Bitmask of cargo types which cause trigger re-randomizing
 157
 158         byte callback_mask; ///< Bitmask of station callbacks that have to be called
 159
 160         byte flags; ///< Bitmask of flags, bit 0: use different sprite set; bit 1: divide cargo about by station size
 161
 162         byte pylons;  ///< Bitmask of base tiles (0 - 7) which should contain elrail pylons
 163         byte wires;   ///< Bitmask of base tiles (0 - 7) which should contain elrail wires
 164         byte blocked; ///< Bitmask of base tiles (0 - 7) which are blocked to trains
 165
 166         AnimationInfo animation;
 167
 168         byte lengths;
 169         byte *platforms;
 170         StationLayout **layouts;
 171         bool copied_layouts;
 172 };
 173
 174 /** Struct containing information relating to station classes. */
 175 typedef NewGRFClass<StationSpec, StationClassID, STAT_CLASS_MAX> StationClass;
 176
 177 const StationSpec *GetStationSpec(TileIndex t);
 178
 179 /* Evaluate a tile's position within a station, and return the result a bitstuffed format. */
 180 uint32 GetPlatformInfo(Axis axis, byte tile, int platforms, int length, int x, int y, bool centred);
 181
 182 SpriteID GetCustomStationRelocation(const StationSpec *statspec, BaseStation *st, TileIndex tile, uint32 var10 = 0);
 183 SpriteID GetCustomStationFoundationRelocation(const StationSpec *statspec, BaseStation *st, TileIndex tile, uint layout, uint edge_info);
 184 uint16 GetStationCallback(CallbackID callback, uint32 param1, uint32 param2, const StationSpec *statspec, BaseStation *st, TileIndex tile);
 185 CommandCost PerformStationTileSlopeCheck(TileIndex north_tile, TileIndex cur_tile, const StationSpec *statspec, Axis axis, byte plat_len, byte numtracks);
 186
 187 /* Allocate a StationSpec to a Station. This is called once per build operation. */
 188 int AllocateSpecToStation(const StationSpec *statspec, BaseStation *st, bool exec);
 189
 190 /* Deallocate a StationSpec from a Station. Called when removing a single station tile. */
 191 void DeallocateSpecFromStation(BaseStation *st, byte specindex);
 192
 193 /* Draw representation of a station tile for GUI purposes. */
 194 bool DrawStationTile(int x, int y, RailType railtype, Axis axis, StationClassID sclass, uint station);
 195
 196 void AnimateStationTile(TileIndex tile);
 197 void TriggerStationAnimation(BaseStation *st, TileIndex tile, StationAnimationTrigger trigger, CargoID cargo_type = CT_INVALID);
 198 void TriggerStationRandomisation(Station *st, TileIndex tile, StationRandomTrigger trigger, CargoID cargo_type = CT_INVALID);
 199 void StationUpdateCachedTriggers(BaseStation *st);
 200
 201 #endif /* NEWGRF_STATION_H */