diff options
Diffstat (limited to 'src/newgrf_commons.cpp')
| -rw-r--r-- | src/newgrf_commons.cpp | 69 |
1 files changed, 69 insertions, 0 deletions
diff --git a/src/newgrf_commons.cpp b/src/newgrf_commons.cpp index 9e796aa60..6c03de201 100644 --- a/src/newgrf_commons.cpp +++ b/src/newgrf_commons.cpp @@ -151,6 +151,75 @@ void HouseOverrideManager::SetEntitySpec(const HouseSpec *hs) } } +/** Method to find an entity ID and to mark it as reserved for the Industry to be included. + * @param grf_local_id ID used by the grf file for pre-installation work (equivalent of TTDPatch's setid + * @param grfid ID of the current grf file + * @param substitute_id industry from which data has been copied + * @return a free entity id (slotid) if ever one has been found, or Invalid_ID marker otherwise + */ +uint16 IndustryOverrideManager::AddEntityID(byte grf_local_id, uint32 grfid, byte substitute_id) +{ + /* This entity hasn't been defined before, so give it an ID now. */ + for (uint16 id = 0; id < max_new_entities; id++) { + /* Get the real live industry */ + const IndustrySpec *inds = GetIndustrySpec(id); + + /* This industry must be one that is not available(enabled), mostly because of climate. + * And it must not already be used by a grf (grffile == NULL). + * So reseve this slot here, as it is the chosen one */ + if (!inds->enabled && inds->grf_prop.grffile == NULL) { + EntityIDMapping *map = &mapping_ID[id]; + + if (map->entity_id == 0 && map->grfid == 0) { + /* winning slot, mark it as been used */ + map->entity_id = grf_local_id; + map->grfid = grfid; + map->substitute_id = substitute_id; + return id; + } + } + } + + return invalid_ID; +} + +/** Method to install the new indistry data in its proper slot + * The slot assigment is internal of this method, since it requires + * checking what is available + * @param inds Industryspec that comes from the grf decoding process + */ +void IndustryOverrideManager::SetEntitySpec(const IndustrySpec *inds) +{ + /* First step : We need to find if this industry is already specified in the savegame data */ + IndustryType ind_id = this->GetID(inds->grf_prop.local_id, inds->grf_prop.grffile->grfid); + + if (ind_id == invalid_ID) { // not found? So this is the introduction of a new industry + /* Second step is dealing with the override. */ + if (inds->grf_prop.override != invalid_ID && _industry_specs[inds->grf_prop.override].grf_prop.override == invalid_ID) { + /* this is an override, which means it will take the place of the industry it is + * designed to replace. Before we conclude that the override is allowed, + * we first need to verify that the slot is not holding another override + * If it's the case,it will be considered as a normal substitute */ + ind_id = inds->grf_prop.override; + } else { + /* It has already been overriden, so you've lost your place old boy. + * Or it is a simple substitute. + * In both case, we need to find a free available slot */ + ind_id = this->AddEntityID(inds->grf_prop.local_id, inds->grf_prop.grffile->grfid, inds->grf_prop.subst_id); + } + } + + if (ind_id == invalid_ID) { + grfmsg(1, "Industry.SetEntitySpec: Too many industries allocated. Ignoring."); + return; + } + + /* Now that we know we can use the given id, copy the spech to its final destination*/ + memcpy(&_industry_specs[ind_id], inds, sizeof(*inds)); + /* and mark it as usable*/ + _industry_specs[ind_id].enabled = true; +} + /** Function used by houses (and soon industries) to get information * on type of "terrain" the tile it is queries sits on. * @param tile TileIndex of the tile been queried |