src/newgrf_engine.h

   1 /*
   2  * This file is part of OpenTTD.
   3  * 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.
   4  * 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.
   5  * 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/>.
   6  */
   7
   8 /** @file newgrf_engine.h Functions for NewGRF engines. */
   9
  10 #ifndef NEWGRF_ENGINE_H
  11 #define NEWGRF_ENGINE_H
  12
  13 #include "direction_type.h"
  14 #include "newgrf_callbacks.h"
  15 #include "newgrf_properties.h"
  16 #include "vehicle_type.h"
  17 #include "engine_type.h"
  18 #include "gfx_type.h"
  19 #include "newgrf_spritegroup.h"
  20
  21 /** Resolver for a vehicle scope. */
  22 struct VehicleScopeResolver : public ScopeResolver {
  23         const struct Vehicle *v; ///< The vehicle being resolved.
  24         EngineID self_type;      ///< Type of the vehicle.
  25         bool info_view;          ///< Indicates if the item is being drawn in an info window.
  26
  27         /**
  28          * Scope resolver of a single vehicle.
  29          * @param ro Surrounding resolver.
  30          * @param engine_type Engine type
  31          * @param v %Vehicle being resolved.
  32          * @param info_view Indicates if the item is being drawn in an info window.
  33          */
  34         VehicleScopeResolver(ResolverObject &ro, EngineID engine_type, const Vehicle *v, bool info_view)
  35                 : ScopeResolver(ro), v(v), self_type(engine_type), info_view(info_view)
  36         {
  37         }
  38
  39         void SetVehicle(const Vehicle *v) { this->v = v; }
  40
  41         uint32 GetRandomBits() const override;
  42         uint32 GetVariable(byte variable, uint32 parameter, bool *available) const override;
  43         uint32 GetTriggers() const override;
  44 };
  45
  46 /** Resolver for a vehicle (chain) */
  47 struct VehicleResolverObject : public ResolverObject {
  48         /** Application of 'wagon overrides'. */
  49         enum WagonOverride {
  50                 WO_NONE,     //!< Resolve no wagon overrides.
  51                 WO_UNCACHED, //!< Resolve wagon overrides.
  52                 WO_CACHED,   //!< Resolve wagon overrides using TrainCache::cached_override.
  53                 WO_SELF,     //!< Resolve self-override (helicopter rotors and such).
  54         };
  55
  56         VehicleScopeResolver self_scope;     ///< Scope resolver for the indicated vehicle.
  57         VehicleScopeResolver parent_scope;   ///< Scope resolver for its parent vehicle.
  58
  59         VehicleScopeResolver relative_scope; ///< Scope resolver for an other vehicle in the chain.
  60         byte cached_relative_count;          ///< Relative position of the other vehicle.
  61
  62         VehicleResolverObject(EngineID engine_type, const Vehicle *v, WagonOverride wagon_override, bool info_view = false,
  63                         CallbackID callback = CBID_NO_CALLBACK, uint32 callback_param1 = 0, uint32 callback_param2 = 0);
  64
  65         ScopeResolver *GetScope(VarSpriteGroupScope scope = VSG_SCOPE_SELF, byte relative = 0) override;
  66
  67         const SpriteGroup *ResolveReal(const RealSpriteGroup *group) const override;
  68
  69         GrfSpecFeature GetFeature() const override;
  70         uint32 GetDebugID() const override;
  71 };
  72
  73 static const uint TRAININFO_DEFAULT_VEHICLE_WIDTH   = 29;
  74 static const uint ROADVEHINFO_DEFAULT_VEHICLE_WIDTH = 32;
  75 static const uint VEHICLEINFO_FULL_VEHICLE_WIDTH    = 32;
  76
  77 struct VehicleSpriteSeq;
  78
  79 void SetWagonOverrideSprites(EngineID engine, CargoID cargo, const struct SpriteGroup *group, EngineID *train_id, uint trains);
  80 const SpriteGroup *GetWagonOverrideSpriteSet(EngineID engine, CargoID cargo, EngineID overriding_engine);
  81 void SetCustomEngineSprites(EngineID engine, byte cargo, const struct SpriteGroup *group);
  82
  83 void GetCustomEngineSprite(EngineID engine, const Vehicle *v, Direction direction, EngineImageType image_type, VehicleSpriteSeq *result);
  84 #define GetCustomVehicleSprite(v, direction, image_type, result) GetCustomEngineSprite(v->engine_type, v, direction, image_type, result)
  85 #define GetCustomVehicleIcon(et, direction, image_type, result) GetCustomEngineSprite(et, nullptr, direction, image_type, result)
  86
  87 void GetRotorOverrideSprite(EngineID engine, const struct Aircraft *v, bool info_view, EngineImageType image_type, VehicleSpriteSeq *result);
  88 #define GetCustomRotorSprite(v, i, image_type, result) GetRotorOverrideSprite(v->engine_type, v, i, image_type, result)
  89 #define GetCustomRotorIcon(et, image_type, result) GetRotorOverrideSprite(et, nullptr, true, image_type, result)
  90
  91 /* Forward declaration of GRFFile, to avoid unnecessary inclusion of newgrf.h
  92  * elsewhere... */
  93 struct GRFFile;
  94
  95 void SetEngineGRF(EngineID engine, const struct GRFFile *file);
  96
  97 uint16 GetVehicleCallback(CallbackID callback, uint32 param1, uint32 param2, EngineID engine, const Vehicle *v);
  98 uint16 GetVehicleCallbackParent(CallbackID callback, uint32 param1, uint32 param2, EngineID engine, const Vehicle *v, const Vehicle *parent);
  99 bool UsesWagonOverride(const Vehicle *v);
 100
 101 /* Handler to Evaluate callback 36. If the callback fails (i.e. most of the
 102  * time) orig_value is returned */
 103 uint GetVehicleProperty(const Vehicle *v, PropertyID property, uint orig_value);
 104 uint GetEngineProperty(EngineID engine, PropertyID property, uint orig_value, const Vehicle *v = nullptr);
 105
 106 enum VehicleTrigger {
 107         VEHICLE_TRIGGER_NEW_CARGO     = 0x01,
 108         /* Externally triggered only for the first vehicle in chain */
 109         VEHICLE_TRIGGER_DEPOT         = 0x02,
 110         /* Externally triggered only for the first vehicle in chain, only if whole chain is empty */
 111         VEHICLE_TRIGGER_EMPTY         = 0x04,
 112         /* Not triggered externally (called for the whole chain if we got NEW_CARGO) */
 113         VEHICLE_TRIGGER_ANY_NEW_CARGO = 0x08,
 114         /* Externally triggered for each vehicle in chain */
 115         VEHICLE_TRIGGER_CALLBACK_32   = 0x10,
 116 };
 117 void TriggerVehicle(Vehicle *veh, VehicleTrigger trigger);
 118
 119 void AlterVehicleListOrder(EngineID engine, uint target);
 120 void CommitVehicleListOrderChanges();
 121
 122 EngineID GetNewEngineID(const GRFFile *file, VehicleType type, uint16 internal_id);
 123
 124 #endif /* NEWGRF_ENGINE_H */