[Kde-games-devel] Online Granatier, common real time online gaming libs?

[Nathan Sala]

2013/5/31 Mathias Kraus <k.hias at gmx.de>

> Am Mittwoch, 29. Mai 2013, 21:56:40 schrieb Nathan Sala:
> > Hello there gamers,
>
> Hi
>
> > We had a really great time playing Granatier today on the KDE stand for
> the
> > OpenSource solutions forum in Paris.
> > People also enjoyed watching us ;)
>
> Nice to hear :)
>
> > It came an idea which is to implement the online mode.
>
> I always wanted Granatier to be an online game, but I didn't find time to
> do it.
> Last year, I think, I saw a blog post from the telepathy guys. They had a
> proof of concept online version of battleship, but I don't know what
> happened with that.
> At that time it sounded reasonable to use telepathy to connect the player
> with each other. With telepathy we wouldn't need to care about such things
> like NAT and so on.
>
> Yes that would be good. Can it help with NAT?


> > As far as I know, there is no example of real time online gaming in kde
> > games?
> >
>
> I see a common part which would be valid for any game:
> > - A client/server model with their specific interfaces.
> > - Network layer
> >   - A common messages header.
> >   - A TCP/UDP messages matching.
> >   - A messages synchronization based on sequence numbers.
> > - A later next step: textual description of the network messages and
> > automatic structs and classes generation at compile time.
>
> It look like you have some experience with online gaming. It would be
> great if you could help with a common library.
>

No. I have experience about networking performance and reliability, but not
about game engines.
As a first step I want to build a solid low level networking UDP/TCP layer
which will handle clients/server synchronization.
But then I need to find a good generic algorithm and therefore a  protocol.

The best idea I have until now would be like:
- User inputs are sent to the server and redistributed to all the clients.
- Every XX milliseconds, the server sends the full current state of the
game to all the clients.


>
> > And then Granatier as a POC:
> > - Modification of the game engine to fully support the client/server
> model
> > with 2 types of clients: local and remote.
> > - Some UI work about creating/joining games and so on.
>
> I already did some proof of concept work in a scratch repo to try to
> separate the game engine from the visual representation, but didn't get too
> far.
> It's a big task, the codebase is about 8000 lines of code, but it is
> doable if there are several people working on it.
>

What a good new. That's what we need!


>
> Regards,
> Hias
>
> > This is just a first thought, so any comment is greatly welcome
> >
> > Regards,
> > Nathan
>
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