static void DoTriggerHouse(TileIndex tile, HouseTrigger trigger, byte base_random, bool first)
{
ResolverObject object;
/* We can't trigger a non-existent building... */
assert(IsTileType(tile, MP_HOUSE));
HouseID hid = GetHouseType(tile);
HouseSpec *hs = HouseSpec::Get(hid);
if (hs->spritegroup == NULL) return;
NewHouseResolver(&object, hid, tile, Town::GetByTile(tile));
object.callback = CBID_RANDOM_TRIGGER;
object.trigger = trigger;
const SpriteGroup *group = SpriteGroup::Resolve(hs->spritegroup, &object);
if (group == NULL) return;
byte new_random_bits = Random();
byte random_bits = GetHouseRandomBits(tile);
random_bits &= ~object.reseed;
random_bits |= (first ? new_random_bits : base_random) & object.reseed;
SetHouseRandomBits(tile, random_bits);
switch (trigger) {
case HOUSE_TRIGGER_TILE_LOOP:
/* Random value already set. */
break;
case HOUSE_TRIGGER_TILE_LOOP_TOP:
if (!first) {
/* The top tile is marked dirty by the usual TileLoop */
MarkTileDirtyByTile(tile);
break;
}
/* Random value of first tile already set. */
if (hs->building_flags & BUILDING_2_TILES_Y) DoTriggerHouse(TILE_ADDXY(tile, 0, 1), trigger, random_bits, false);
if (hs->building_flags & BUILDING_2_TILES_X) DoTriggerHouse(TILE_ADDXY(tile, 1, 0), trigger, random_bits, false);
if (hs->building_flags & BUILDING_HAS_4_TILES) DoTriggerHouse(TILE_ADDXY(tile, 1, 1), trigger, random_bits, false);
break;
}
}
void TriggerHouse(TileIndex t, HouseTrigger trigger)
{
DoTriggerHouse(t, trigger, 0, true);
}