/* $Id$ */ /* * This file is part of OpenTTD. * 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. * 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. * 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 . */ /** * @file newgrf_commons.h This file simplyfies and embeds a common mechanism of * loading/saving and mapping of grf entities. */ #ifndef NEWGRF_COMMONS_H #define NEWGRF_COMMONS_H #include "tile_type.h" /** Contextx for tile accesses */ enum TileContext { TCX_NORMAL, ///< Nothing special. TCX_UPPER_HALFTILE, ///< Querying information about the upper part of a tile with halftile foundation. TCX_ON_BRIDGE, ///< Querying information about stuff on the bridge (via some bridgehead). }; /** * Maps an entity id stored on the map to a GRF file. * Entities are objects used ingame (houses, industries, industry tiles) for * which we need to correlate the ids from the grf files with the ones in the * the savegames themselves. * An array of EntityIDMapping structs is saved with the savegame so * that those GRFs can be loaded in a different order, or removed safely. The * index in the array is the entity's ID stored on the map. * * The substitute ID is the ID of an original entity that should be used instead * if the GRF containing the new entity is not available. */ struct EntityIDMapping { uint32 grfid; ///< The GRF ID of the file the entity belongs to uint8 entity_id; ///< The entity ID within the GRF file uint8 substitute_id; ///< The (original) entity ID to use if this GRF is not available }; class OverrideManagerBase { protected: uint16 *entity_overrides; uint32 *grfid_overrides; uint16 max_offset; ///< what is the length of the original entity's array of specs uint16 max_new_entities; ///< what is the amount of entities, old and new summed uint16 invalid_ID; ///< ID used to dected invalid entities; virtual bool CheckValidNewID(uint16 testid) { return true; } public: EntityIDMapping *mapping_ID; ///< mapping of ids from grf files. Public out of convenience OverrideManagerBase(uint16 offset, uint16 maximum, uint16 invalid); virtual ~OverrideManagerBase(); void ResetOverride(); void ResetMapping(); void Add(uint8 local_id, uint32 grfid, uint entity_type); virtual uint16 AddEntityID(byte grf_local_id, uint32 grfid, byte substitute_id); uint16 GetSubstituteID(uint16 entity_id) const; virtual uint16 GetID(uint8 grf_local_id, uint32 grfid) const; inline uint16 GetMaxMapping() const { return max_new_entities; } inline uint16 GetMaxOffset() const { return max_offset; } }; struct HouseSpec; class HouseOverrideManager : public OverrideManagerBase { public: HouseOverrideManager(uint16 offset, uint16 maximum, uint16 invalid) : OverrideManagerBase(offset, maximum, invalid) {} void SetEntitySpec(const HouseSpec *hs); }; struct IndustrySpec; class IndustryOverrideManager : public OverrideManagerBase { public: IndustryOverrideManager(uint16 offset, uint16 maximum, uint16 invalid) : OverrideManagerBase(offset, maximum, invalid) {} virtual uint16 AddEntityID(byte grf_local_id, uint32 grfid, byte substitute_id); virtual uint16 GetID(uint8 grf_local_id, uint32 grfid) const; void SetEntitySpec(IndustrySpec *inds); }; struct IndustryTileSpec; class IndustryTileOverrideManager : public OverrideManagerBase { protected: virtual bool CheckValidNewID(uint16 testid) { return testid != 0xFF; } public: IndustryTileOverrideManager(uint16 offset, uint16 maximum, uint16 invalid) : OverrideManagerBase(offset, maximum, invalid) {} void SetEntitySpec(const IndustryTileSpec *indts); }; struct AirportSpec; class AirportOverrideManager : public OverrideManagerBase { public: AirportOverrideManager(uint16 offset, uint16 maximum, uint16 invalid) : OverrideManagerBase(offset, maximum, invalid) {} void SetEntitySpec(AirportSpec *inds); }; struct AirportTileSpec; class AirportTileOverrideManager : public OverrideManagerBase { protected: virtual bool CheckValidNewID(uint16 testid) { return testid != 0xFF; } public: AirportTileOverrideManager(uint16 offset, uint16 maximum, uint16 invalid) : OverrideManagerBase(offset, maximum, invalid) {} void SetEntitySpec(const AirportTileSpec *ats); }; extern HouseOverrideManager _house_mngr; extern IndustryOverrideManager _industry_mngr; extern IndustryTileOverrideManager _industile_mngr; extern AirportOverrideManager _airport_mngr; extern AirportTileOverrideManager _airporttile_mngr; uint32 GetTerrainType(TileIndex tile, TileContext context = TCX_NORMAL); TileIndex GetNearbyTile(byte parameter, TileIndex tile); uint32 GetNearbyTileInformation(TileIndex tile); /** * Data related to the handling of grf files. * @tparam Tcnt Number of spritegroups */ template struct GRFFilePropsBase { GRFFilePropsBase() : local_id(0), grffile(0) { /* The lack of some compilers to provide default constructors complying to the specs * requires us to zero the stuff ourself. */ memset(spritegroup, 0, sizeof(spritegroup)); } uint16 local_id; ///< id defined by the grf file for this entity const struct GRFFile *grffile; ///< grf file that introduced this entity const struct SpriteGroup *spritegroup[Tcnt]; ///< pointer to the different sprites of the entity }; /** Data related to the handling of grf files. */ struct GRFFileProps : GRFFilePropsBase<1> { /** Set all default data constructor for the props. */ GRFFileProps(uint16 subst_id) : GRFFilePropsBase<1>(), subst_id(subst_id), override(subst_id) { } /** Simple constructor for the props. */ GRFFileProps() : GRFFilePropsBase<1>() {} uint16 subst_id; uint16 override; ///< id of the entity been replaced by }; #endif /* NEWGRF_COMMONS_H */