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genxium 2023-01-30 09:56:19 +08:00
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# Preface
This project is a demo for a websocket-based rollback netcode inspired by [GGPO](https://github.com/pond3r/ggpo/blob/master/doc/README.md). As lots of feedbacks ask for a discussion on using UDP instead, I tried to summarize my personal opinion about it in [ConcerningEdgeCases](./ConcerningEdgeCases.md) -- not necessarily correct but that's indeed a question to face :)
This project is a demo for a websocket-based rollback netcode inspired by [GGPO](https://github.com/pond3r/ggpo/blob/master/doc/README.md).
As lots of feedbacks ask for a discussion on using UDP instead, I tried to summarize my personal opinion about it in [ConcerningEdgeCases](./ConcerningEdgeCases.md) -- **since v0.9.25, the project is actually equipped with UDP capabilities as follows**.
- When using the so called `native apps` on `Android` and `Windows` (I'm working casually hard to support `iOS` next), the frontends will try to use UDP hole-punching w/ the help of backend as a registry. If UDP hole-punching is working, the rollback is often less than `turn-around frames to recover` and thus not noticeable, being much better than using websocket alone.
- If UDP hole-punching is not working, e.g. for Symmetric NAT like in 4G/5G cellular network, the frontends will use backend as a UDP tunnel (or relay, whatever you like to call it). This video shows how the UDP tunnel performs for a [Phone-4G v.s. PC-Wifi (viewed by PC side)](https://pan.baidu.com/s/1wdUTvRiyrTLWy7mF6G7uyQ?pwd=icmp).
- Browser vs `native app` is possible but in that case only websocket is used.
The following video is recorded over INTERNET using an input delay of 4 frames and it feels SMOOTH when playing! Please also checkout these demo videos
- [source video of the first gif (earlier version)](https://pan.baidu.com/s/1ML6hNupaPHPJRd5rcTvQvw?pwd=8ruc)