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/* $Id$ */
/*
* 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 <http://www.gnu.org/licenses/>.
*/
/**
* @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 <size_t Tcnt>
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 */
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