#Supreme commander 2 desync code

The UI instantly flashes in response as UserTick updates at 60hz. During this time Player A issues an attack command. This means for any new piece of input it can’t be processed until all clients agree on which tick to process it!įor example three players - player A, B, and C - are all running SimTick 1. I went over how each user in a multiplayer game is updating an identical game state and they only need to process input. Aside from the complexity of creating a massive deterministic simulation there is also some required latency on input. There are some distinct downsides to a synchronous multiplayer game. This is why the game can look and feel smooth when it’s secretly slow in the background. Each UserTick updates at a variable time delta which is used to interpolate the game state (such as unit positions). User interface, rendering, animation, and even unit position can run at a silky smooth 60fps. This layer can be thought of as strictly visual. In a multiplayer game if one player is unable to fully process the SimTick in 100ms then all other players can become held up and have to wait wait. Each SimTick needs to run within 100ms or the game will play in slow motion. All units, all AI, and all physics are updating within a SimTick function running at a mere 10 hz. This is what you could consider the “real game”. The simulation layer runs at a fixed 10 fps all the time. The SupCom engine uses two layers - simulation and user. The game is actually running at two separate frame rates. Wait, what? It looks far smoother than 10 fps you say! It is and it isn’t. What frame rate do you think the game is running at? The correct answer is 10 frames per second. Take a look at the video if you haven’t already. If the game has 3000 units that’s just too much.

For a player to join mid-game the entire game state would have to be sync’d. It’s also why some RTS games don’t allow join in progress. This is also why replays stop working when the game is patched and why you frequently can’t rewind them. Simply re-run the game feeding the inputs from the replay file and you’ll get the exact same result. Have you ever wondered why file sizes of instant replays are so tiny? It’s because the replay file only needs to store player inputs. It’s the same principle as instant replays in many games, including shooters. If all players have an identical game state and process the same input then their output state should also be identical.

Instead of transferring over per unit state information (position, health, etc) over the network only player input needs to be sent across the networks.

#Supreme commander 2 desync code

In an 8 player game of SupCom every player has an identical copy of the game state and follows an identical code path. We will be adding a 'Show All Regions' button in the next patch.With a fully synchronous lockstep architecture! In a synchronous engine every client executes the exact same code at the exact same frame rate.

Default games list is currently limited to games hosted in your current Global Steam region.

Joining via standard game list fully functional Joining passworded games via the 'Friends' list still not functioning to spec. Was 2650Ĭybranasaurus Energy cost reduced to 4900. Reduced Research Station mass cost to 375 Was 150įixed Illuminate Land Radar boost description Wilfindja movement speed increased to 3.6. Proto Brain and Star King Extreme navigation radius fixed Soul Ripper, Darkenoid, Mega-Fortress and Star King Extreme crash damage set to 5000 Proto Brain vision radius increased to 32.

MP UI polish - Multiple fixes and polish throughout the MP menus.

Highlight on top scores in summary screen Setting Exclusions in skirmish lobby will no longer reset player choices (color, team etc)Īlso added message to players when they leave the chat on Summary screen and on SkirmishĪdded tag to the messages that are sent to team only Passworded games for your friends will now show up in the friends tab (see related known issues below) Game type indicator on in-game scoreboardĭead player indication on in-game scoreboard Navigation fixes for Cybran Protobrain and UEF experimental Transport Improved path-finding and performance for larger games