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https://github.com/JGRennison/OpenTTD-patches.git
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70 lines
2.2 KiB
C++
70 lines
2.2 KiB
C++
/* $Id$ */
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/** @file newgrf_commons.h This file simplyfies and embeds a common mechanism of
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* loading/saving and mapping of grf entities.
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*/
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#ifndef NEWGRF_COMMONS_H
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#define NEWGRF_COMMONS_H
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/**
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* Maps an entity id stored on the map to a GRF file.
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* Entities are objects used ingame (houses, industries, industry tiles) for
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* which we need to correlate the ids from the grf files with the ones in the
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* the savegames themselves.
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* An array of EntityIDMapping structs is saved with the savegame so
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* that those GRFs can be loaded in a different order, or removed safely. The
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* index in the array is the entity's ID stored on the map.
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*
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* The substitute ID is the ID of an original entity that should be used instead
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* if the GRF containing the new entity is not available.
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*/
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struct EntityIDMapping {
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uint32 grfid; ///< The GRF ID of the file the entity belongs to
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uint8 entity_id; ///< The entity ID within the GRF file
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uint8 substitute_id; ///< The (original) entity ID to use if this GRF is not available
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};
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class OverrideManagerBase
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{
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protected:
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uint16 *entity_overrides;
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uint16 max_offset; ///< what is the length of the original entity's array of specs
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uint16 max_new_entities; ///< what is the amount of entities, old and new summed
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uint16 invalid_ID; ///< ID used to dected invalid entities;
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virtual uint16 AddEntityID(byte grf_local_id, uint32 grfid, byte substitute_id);
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public:
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EntityIDMapping *mapping_ID; ///< mapping of ids from grf files. Public out of convenience
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OverrideManagerBase(uint16 offset, uint16 maximum, uint16 invalid);
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virtual ~OverrideManagerBase();
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void ResetOverride();
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void ResetMapping();
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void Add(uint8 local_id, uint entity_type);
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uint16 GetSubstituteID(byte entity_id);
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uint16 GetID(uint8 grf_local_id, uint32 grfid);
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inline uint16 GetMaxMapping() { return max_new_entities; };
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inline uint16 GetMaxOffset() { return max_offset; };
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};
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struct HouseSpec;
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class HouseOverrideManager : public OverrideManagerBase
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{
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public:
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HouseOverrideManager(uint16 offset, uint16 maximum, uint16 invalid) : OverrideManagerBase(offset, maximum, invalid) {};
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void SetEntitySpec(const HouseSpec *hs);
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};
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extern HouseOverrideManager _house_mngr;
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#endif /* NEWGRF_COMMONS_H */
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