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/* $Id$ */
/** @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
/**
* 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;
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 uint16 AddEntityID(byte grf_local_id, uint32 grfid, byte substitute_id);
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, uint entity_type);
uint16 GetSubstituteID(byte entity_id);
uint16 GetID(uint8 grf_local_id, uint32 grfid);
inline uint16 GetMaxMapping() { return max_new_entities; };
inline uint16 GetMaxOffset() { 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);
};
extern HouseOverrideManager _house_mngr;
#endif /* NEWGRF_COMMONS_H */
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