5 ms·

Multiplayer functionality doesn't seem to be working for me. Is this just me, or an artifact of the compilation?

db48x 8y ago
The browser doesn't provide the usual POSIX api for opening TCP connections. With some work you can write a shim library that implements it in terms of websockets, but it still can't connect to arbitrary hosts. Instead you have to run a proxy server for it to connect to.
- reubenmorais 8y ago
  Could you use WebRTC instead, for true P2P?
  - db48x 8y ago
    You still need a proxy server, unless the OpenTTD game browser supports WebRTC connections.
    - jeremija 8y ago
      Yeah, you'd need a proxy server (websockets) to establish WebRTC connections. Even after a WebRTC connection is established, you'd need a STUN or a TURN (coturn supports both) server to get around NATs. Pls somebody correct me if I'm wrong!
      - tim-- 8y ago
        You should only need a STUN or TURN server if you are attempting to connect to a machine that is behind a NAT. OpenTTD servers are usually on public IPs (similar to HTTP servers), so a STUN or TURN server should not be required. The biggest issue is that WebRTC connections do not allow you to send raw data over TCP or UDP[1]. That being said, it shouldn't be too difficult to just create a WebSocket server that translates between the native network protocol and HTTP WebSockets[2]. [1] https://developer.mozilla.org/en-US/docs/Web/API/RTCDataChannel [2] https://wiki.openttd.org/Network_Protocol
      - db48x 8y ago
        You're entirely correct. Here's a demo if you're interested: http://vrcade.io/win311 http://vrcade.io/win311
  - lxtx 8y ago
    You can. I've used WebRTC for multiplayer support in Quake 3 compiled to WebAssembly.
    - fb03 8y ago
      Do you have a link for that? Sounds super cool
      - lxtx 8y ago
        The forked ioquake3 is available at https://github.com/seemk/ioq3 https://github.com/seemk/ioq3 However it's not trivial to get it working at the moment, will hopefully soon come back to this project and finish it :D

The browser doesn't provide the usual POSIX api for opening TCP connections. With some work you can write a shim library that implements it in terms of websockets, but it still can't connect to arbitrary hosts. Instead you have to run a proxy server for it to connect to.

reubenmorais 8y ago
Could you use WebRTC instead, for true P2P?
- db48x 8y ago
  You still need a proxy server, unless the OpenTTD game browser supports WebRTC connections.
  - jeremija 8y ago
    Yeah, you'd need a proxy server (websockets) to establish WebRTC connections. Even after a WebRTC connection is established, you'd need a STUN or a TURN (coturn supports both) server to get around NATs. Pls somebody correct me if I'm wrong!
    - tim-- 8y ago
      You should only need a STUN or TURN server if you are attempting to connect to a machine that is behind a NAT. OpenTTD servers are usually on public IPs (similar to HTTP servers), so a STUN or TURN server should not be required. The biggest issue is that WebRTC connections do not allow you to send raw data over TCP or UDP[1]. That being said, it shouldn't be too difficult to just create a WebSocket server that translates between the native network protocol and HTTP WebSockets[2]. [1] https://developer.mozilla.org/en-US/docs/Web/API/RTCDataChannel [2] https://wiki.openttd.org/Network_Protocol
    - db48x 8y ago
      You're entirely correct. Here's a demo if you're interested: http://vrcade.io/win311 http://vrcade.io/win311
- lxtx 8y ago
  You can. I've used WebRTC for multiplayer support in Quake 3 compiled to WebAssembly.
  - fb03 8y ago
    Do you have a link for that? Sounds super cool
    - lxtx 8y ago
      The forked ioquake3 is available at https://github.com/seemk/ioq3 https://github.com/seemk/ioq3 However it's not trivial to get it working at the moment, will hopefully soon come back to this project and finish it :D