✨ Usable multiplayer

Scripts/Logic/PlayerInput.cs

@@ -0,0 +1,33 @@
+using Godot;
+
+namespace CodingLand.Scripts.Logic;
+
+public partial class PlayerInput : MultiplayerSynchronizer
+{
+    [Export] public bool IsDashing;
+
+    [Export] public Vector2 MovementDirection;
+
+    public override void _Ready()
+    {
+        if (GetMultiplayerAuthority() != Multiplayer.GetUniqueId())
+        {
+            SetProcess(false);
+            SetPhysicsProcess(false);
+        }
+    }
+
+    [Rpc(CallLocal = true)]
+    private void Dash()
+    {
+        IsDashing = true;
+    }
+
+    public override void _Process(double delta)
+    {
+        MovementDirection = Input.GetVector("move_left", "move_right", "move_up", "move_down");
+
+        if (Input.IsActionJustPressed("move_dash"))
+            Rpc(nameof(Dash));
+    }
+}

Scripts/Logic/World.cs

@@ -0,0 +1,68 @@
+using System.Numerics;
+using Godot;
+using Vector2 = Godot.Vector2;
+
+namespace CodingLand.Scripts.Logic;
+
+public partial class World : Node2D
+{
+    [Export] public PackedScene PlayerScene;
+
+    public void StartGame()
+    {
+        if (!Multiplayer.IsServer())
+            return;
+
+        // Handling player connect / disconnect after this client connected
+        Multiplayer.PeerDisconnected += RemovePlayer_Adaptor;
+        Multiplayer.PeerConnected += AddPlayer_Adaptor;
+
+        // Handling player connected before this client
+        foreach (var id in Multiplayer.GetPeers())
+            AddPlayer(id);
+
+        // Add this client as a player if client isn't a dedicated server
+        if (!OS.HasFeature("dedicated_server"))
+            AddPlayer(1);
+    }
+
+    public override void _ExitTree()
+    {
+        if (!Multiplayer.IsServer())
+            return;
+
+        Multiplayer.PeerDisconnected -= RemovePlayer_Adaptor;
+        Multiplayer.PeerConnected -= AddPlayer_Adaptor;
+    }
+
+    private string BuildPlayerName(int id)
+    {
+        return $"Player#{id}";
+    }
+
+    private void AddPlayer_Adaptor(long id)
+        => AddPlayer((int)id);
+
+    private void RemovePlayer_Adaptor(long id)
+        => RemovePlayer((int)id);
+
+    private void AddPlayer(int id)
+    {
+        var player = PlayerScene.Instantiate<Player>();
+        player.SetPlayerId(id);
+        var position = Vector2.FromAngle(GD.Randf() * 2 * Mathf.Pi);
+        player.Position = new Vector2(position.X * 5f * GD.Randf(), position.Y * 5f * GD.Randf());
+        player.Name = BuildPlayerName(id);
+
+        AddChild(player, true);
+    }
+
+    private void RemovePlayer(int id)
+    {
+        var name = BuildPlayerName(id);
+        if (!HasNode(name))
+            return;
+
+        GetNode(name).QueueFree();
+    }
+}