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My first goal was to fix the two annoying issues I described in the previous post. The local multiplayer saga, season 2: NetplayĪs the apartment shito is beginning to settle down, I have been able to start working on this. But when the players aren't engaging in a local multiplayer game yet, there is the possibility that mirror clients run too slow and end up lagging behind an awful lot.ġ1 comments (last by SIGMA) | Post a comment If a mirror client runs out of input frames (because the mirror host is running slower), it will need to block until it receives input frames - missing an input frame would cause a desync.ĭuring a local multiplayer game, this has shown to be enough to form a somewhat viable netplay implementation: this crude synchronization mechanism, combined with local multiplayer sync, do a good job at keeping all instances in sync. The basic idea is to delay inputs a bit on all sides to counter network lag.Įach input frame sent by a mirror host is given a frame count, which lets mirror clients make sure to apply that frame at the exact same time as their host, thus ensuring all sides are given the exact same inputs. Similarly, player 2's instance 2 and player 3's instance 3 are also mirror hosts.Īs is typical with netplay implementations, inputs are delayed by a fixed amount, which is hardcoded to 4 frames in the current test branch, but will be configurable in the final product. Then player 1's instance 1 acts as a mirror host: players 2 and 3's instance 1, the mirror clients, connect to it, and receive their input from it, thus mirroring player 1's input on players 2 and 3's machines. The game host transmits useful information to the game clients, tells them when to start running.

So first, we're going to name them.Īssuming player 1 is the player who initiated the game: player 1's instance 1 acts as the game host, while player 2's instance 2 and player 3's instance 3 act as game clients. Implementing this proves to be tricky, because since each individual instance there is its own process, there's a lot of moving parts. If you remember the graph from the previous post: Oh, the fun that is dealing with synchronization. I've been building the basic network infrastructure for netplay lately. If you're running into trouble: Howto/FAQ