https://blog.wongcw.com/2021/05/08/id-software%e9%a6%96%e5%b8%ad%e9%97%9c%e5%8d%a1%e8%a8%ad%e8%a8%88%e5%b8%ab%e9%9b%a2%e8%81%b7%e6%9b%be%e5%8f%83%e8%88%87%e8%a3%bd%e4%bd%9c%e3%80%8a%e6%af%80%e6%bb%85%e6%88%b0%e5%a3%ab%ef%bc%9a%e6%b0%b8/