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client_server_detection

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client_server_detection [2019/09/05 20:46] – [How it works] korshunclient_server_detection [2019/09/05 20:54] (current) – [Writing robust multiplayer code] korshun
Line 43: Line 43:
 { {
     // Draw hud, spawn effects.     // Draw hud, spawn effects.
 +}
 +</code>
 +
 +You can also make sure that a serverside-only function is not called on the client, and a clientside-only function is not called on the server.
 +
 +<code>
 +function ServersideOnlyFunction(void)
 +{
 +    // writing if (IsClient()) would incorrectly display the warning in singleplayer.
 +    if (!IsServer())
 +        printbold(s:"Error: ServersideOnlyFunction was called clientside");
 +        
 +    ...
 +}
 +
 +function ClientsideOnlyFunction(void)
 +{
 +    // writing if (IsServer()) would incorrectly display the warning in singleplayer.
 +    if (!IsClient())
 +        printbold(s:"Error: ClientsideOnlyFunction was called serverside");
 +        
 +    ...
 } }
 </code> </code>
Line 54: Line 76:
 ''IsServer()'' is more complicated. It returns true if [[zdoom>ConsolePlayerNumber]] is negative. But if it's not negative, it needs to distinguish between multiplayer emulation and real multiplayer. It checks if the multiplayer is real using [[zan>IsNetworkGame]]. But calling this function in ZDoom/GZDoom crashes the engine. Therefore, before calling ''IsNetworkGame'', it checks if the engine is Zandronum using [[source_port_detection|IsZandronum]]. ''IsServer()'' is more complicated. It returns true if [[zdoom>ConsolePlayerNumber]] is negative. But if it's not negative, it needs to distinguish between multiplayer emulation and real multiplayer. It checks if the multiplayer is real using [[zan>IsNetworkGame]]. But calling this function in ZDoom/GZDoom crashes the engine. Therefore, before calling ''IsNetworkGame'', it checks if the engine is Zandronum using [[source_port_detection|IsZandronum]].
  
-If the engine is not Zandronum, the function returns true, because in ZDoom/GZDoom all players run gameplay code.+If the engine is not Zandronum, the function returns true, because in ZDoom/GZDoom multiplayer all players run gameplay code.
  
 If the engine is Zandronum, the function returns false if it's real multiplayer, true if it's multiplayer emulation. If the engine is Zandronum, the function returns false if it's real multiplayer, true if it's multiplayer emulation.
client_server_detection.1567716360.txt.gz · Last modified: by korshun

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