[Feature Request] Savestate during online

General Development
#1

Features request: Savestate during online: -------Desync-------- So if we got desync, then server doing savestate (manually) and sends (special key) it to client, and client and server are loading a savestate.

Server —savestate----> Client Load command---------> Load delay 0.1+ping–>Load delay 0.1 (example)

Reconnects during online: -------Disconnected-------- So if we got a disconnect, then server will wait new player for connect (by pressing special key?). When new client (or same client) will connect to server, then:

Server —savestate----> Client Load command---------> Load delay 0.1+ping–>Load delay 0.1

And I found bug with MAME at netplay. Just impossible to play, because we got a desync immediately, also 1st player took a second player’s control.

PS Your emulator is best =) because I can play with friend (which have 175 ping, 20 kb/s speed).

#2

Yeah, having a force-resync would be nice. AFAIK, though, only maister really knew the netcode very well, and he’s not around much anymore. I can mention it to him next time I see him, though.

Re: MAME desyncing, yeah, that’s not too surprising. FBA usually works better, if it supports the game you’re wanting to play.

#3

MAME shouldnt work at all since that core doesn’t support serialization. I think that was fixes (as in make sure it’s disabled) after 1.0.0.2

I discussed a force resync with master and yeah it’s a good idea but some save states are huge so it could be a bit daunting to use.

#4

Mame isnt work yet?

And about savestates, I think that is available to enable save/load in netplay by removing checkings. But now I have 2 questions:

  1. How I cant give commands to save/load to client?
  2. What about synchronization, if I can give commands to save/load to client? And 100 ms it is enough for it? or 60? or less or more?
#5

Hey. So what about resync feature? Sometime internet lost connection and game lost. I see that spectate mode sends savestates for client, so what about it in usually netplay?

#6

It’s something we’ve talked about and I think someone (ctult?) was planning to work on it but I don’t know if that ever went anywhere.

#7

Well, I think would be enough to add feature to start netplay with choosed savestate (from server). Server send savestate to client and it will start after. I see a sending null savestate in code.