def SetStartRoomDataForLevel(self, level_num: LevelNum,
start_room: RoomNum,
entrance_direction: Direction) -> None:
level_offset = level_num * self.LEVEL_METADATA_OFFSET
if start_room:
self.level_metadata[level_offset +
self.START_ROOM_OFFSET] = start_room
if entrance_direction:
self.level_metadata[
level_offset + self.
ENTRANCE_DIRECTION_OFFSET] = entrance_direction.GetRomValue()
if start_room and entrance_direction:
formatted_gateway = (start_room + int(entrance_direction) +
0x80) % 0x100
self.level_metadata[level_offset +
self.GATEWAY_OFFSET] = formatted_gateway
