/* $Id$ */ /** @file newgrf_generic.cpp Handling of generic feature callbacks. */ #include "stdafx.h" #include "debug.h" #include "newgrf.h" #include "newgrf_spritegroup.h" #include <list> struct GenericCallback { const GRFFile *file; const SpriteGroup *group; GenericCallback(const GRFFile *file, const SpriteGroup *group) : file(file), group(group) { } }; typedef std::list<GenericCallback> GenericCallbackList; static GenericCallbackList _gcl[GSF_END]; /** * Reset all generic feature callback sprite groups. */ void ResetGenericCallbacks() { for (uint8 feature = 0; feature < lengthof(_gcl); feature++) { _gcl[feature].clear(); } } /** * Add a generic feature callback sprite group to the appropriate feature list. * @param feature * @param file * @param group */ void AddGenericCallback(uint8 feature, const GRFFile *file, const SpriteGroup *group) { if (feature >= lengthof(_gcl)) { grfmsg(5, "AddGenericCallback: Unsupported feature 0x%02X", feature); return; } /* Generic feature callbacks are evaluated in reverse (i.e. the last group * to be added is evaluated first, etc) thus we push the group to the * beginning of the list so a standard iterator will do the right thing. */ _gcl[feature].push_front(GenericCallback(file, group)); } static uint32 GenericCallbackGetRandomBits(const ResolverObject *object) { return 0; } static uint32 GenericCallbackGetTriggers(const ResolverObject *object) { return 0; } static void GenericCallbackSetTriggers(const ResolverObject *object, int triggers) { return; } static uint32 GenericCallbackGetVariable(const ResolverObject *object, byte variable, byte parameter, bool *available) { switch (variable) { case 0x40: return object->u.generic.cargo_type; case 0x80: return object->u.generic.cargo_type; case 0x81: return object->u.generic.cargo_type; case 0x82: return object->u.generic.default_selection; case 0x83: return object->u.generic.src_industry; case 0x84: return object->u.generic.dst_industry; case 0x85: return object->u.generic.distance; case 0x86: return object->u.generic.event; case 0x87: return object->u.generic.count; case 0x88: return object->u.generic.station_size; default: break; } DEBUG(grf, 1, "Unhandled generic feature property 0x%02X", variable); *available = false; return UINT_MAX; } static const SpriteGroup *GenericCallbackResolveReal(const ResolverObject *object, const SpriteGroup *group) { if (group->g.real.num_loaded == 0) return NULL; return group->g.real.loaded[0]; } static inline void NewGenericResolver(ResolverObject *res, const GRFFile *grffile) { res->GetRandomBits = &GenericCallbackGetRandomBits; res->GetTriggers = &GenericCallbackGetTriggers; res->SetTriggers = &GenericCallbackSetTriggers; res->GetVariable = &GenericCallbackGetVariable; res->ResolveReal = &GenericCallbackResolveReal; res->callback = CBID_NO_CALLBACK; res->callback_param1 = 0; res->callback_param2 = 0; res->last_value = 0; res->trigger = 0; res->reseed = 0; res->count = 0; res->grffile = grffile; } /** Follow a generic feature callback list and return the first successful * answer * @param feature GRF Feature of callback * @param object pre-populated resolver object * @param file address of GRFFile object if file reference is needed, NULL is valid * @return callback value if successful or CALLBACK_FAILED */ static uint16 GetGenericCallbackResult(uint8 feature, ResolverObject *object, const GRFFile **file) { assert(feature < lengthof(_gcl)); /* Test each feature callback sprite group. */ for (GenericCallbackList::const_iterator it = _gcl[feature].begin(); it != _gcl[feature].end(); ++it) { const SpriteGroup *group = it->group; group = Resolve(group, object); if (group == NULL || group->type != SGT_CALLBACK) continue; /* Return NewGRF file if necessary */ if (file != NULL) *file = it->file; return group->g.callback.result; } /* No callback returned a valid result, so we've failed. */ return CALLBACK_FAILED; } /** * 'Execute' an AI purchase selection callback */ uint16 GetAiPurchaseCallbackResult(uint8 feature, CargoID cargo_type, uint8 default_selection, IndustryType src_industry, IndustryType dst_industry, uint8 distance, AIConstructionEvent event, uint8 count, uint8 station_size, const GRFFile **file) { ResolverObject object; NewGenericResolver(&object, *file); object.callback = CBID_GENERIC_AI_PURCHASE_SELECTION; object.u.generic.cargo_type = cargo_type; object.u.generic.default_selection = default_selection; object.u.generic.src_industry = src_industry; object.u.generic.dst_industry = dst_industry; object.u.generic.distance = distance; object.u.generic.event = event; object.u.generic.count = count; object.u.generic.station_size = station_size; uint16 callback = GetGenericCallbackResult(feature, &object, file); if (callback != CALLBACK_FAILED) callback = GB(callback, 0, 8); return callback; }