From ad365dc7225df5df0d8be0729f6c62490c845f77 Mon Sep 17 00:00:00 2001
From: Syntriax <syntriax@gmail.com>
Date: Fri, 25 Jul 2025 21:40:57 +0300
Subject: [PATCH] feat: monogame content loader interface added

---
 .../Abstract/ILoadContent.cs                  | 10 ++++
 .../Behaviours/LoadContentManager.cs          | 53 +++++++++++++++++++
 .../MonoGameWindow.cs                         |  3 ++
 3 files changed, 66 insertions(+)
 create mode 100644 Engine.Integration/Engine.Integration.MonoGame/Abstract/ILoadContent.cs
 create mode 100644 Engine.Integration/Engine.Integration.MonoGame/Behaviours/LoadContentManager.cs

diff --git a/Engine.Integration/Engine.Integration.MonoGame/Abstract/ILoadContent.cs b/Engine.Integration/Engine.Integration.MonoGame/Abstract/ILoadContent.cs
new file mode 100644
index 0000000..042a5b7
--- /dev/null
+++ b/Engine.Integration/Engine.Integration.MonoGame/Abstract/ILoadContent.cs
@@ -0,0 +1,10 @@
+using Microsoft.Xna.Framework.Content;
+
+using Syntriax.Engine.Core;
+
+namespace Syntriax.Engine.Integration.MonoGame;
+
+public interface ILoadContent : IBehaviour
+{
+    void LoadContent(ContentManager content);
+}
diff --git a/Engine.Integration/Engine.Integration.MonoGame/Behaviours/LoadContentManager.cs b/Engine.Integration/Engine.Integration.MonoGame/Behaviours/LoadContentManager.cs
new file mode 100644
index 0000000..ccaf8da
--- /dev/null
+++ b/Engine.Integration/Engine.Integration.MonoGame/Behaviours/LoadContentManager.cs
@@ -0,0 +1,53 @@
+using System.Collections.Generic;
+using Syntriax.Engine.Core;
+
+namespace Syntriax.Engine.Integration.MonoGame;
+
+public class LoadContentManager : Behaviour, IFirstFrameUpdate
+{
+    // We use Ascending order because we are using reverse for loop to call them
+    private static Comparer<IBehaviour> SortByAscendingPriority() => Comparer<IBehaviour>.Create((x, y) => x.Priority.CompareTo(y.Priority));
+
+    private readonly ActiveBehaviourCollectorSorted<ILoadContent> loadContents = new() { SortBy = SortByAscendingPriority() };
+    private readonly List<ILoadContent> toCallLoadContents = new(32);
+
+    private MonoGameWindowContainer monoGameWindowContainer = null!;
+
+    public void FirstActiveFrame()
+    {
+        monoGameWindowContainer = Universe.FindRequiredBehaviour<MonoGameWindowContainer>();
+    }
+
+    protected override void OnEnteredUniverse(IUniverse universe)
+    {
+        loadContents.Assign(universe);
+
+        universe.OnPreUpdate.AddListener(OnPreUpdate);
+    }
+
+    protected override void OnExitedUniverse(IUniverse universe)
+    {
+        loadContents.Unassign();
+
+        universe.OnPreUpdate.RemoveListener(OnPreUpdate);
+    }
+
+    private void OnPreUpdate(IUniverse sender, IUniverse.UpdateArguments args)
+    {
+        for (int i = toCallLoadContents.Count - 1; i >= 0; i--)
+        {
+            toCallLoadContents[i].LoadContent(monoGameWindowContainer.Window.Content);
+            toCallLoadContents.RemoveAt(i);
+        }
+    }
+
+    private void OnFirstFrameCollected(IBehaviourCollector<ILoadContent> sender, IBehaviourCollector<ILoadContent>.BehaviourCollectedArguments args)
+    {
+        toCallLoadContents.Add(args.BehaviourCollected);
+    }
+
+    public LoadContentManager()
+    {
+        loadContents.OnCollected.AddListener(OnFirstFrameCollected);
+    }
+}
diff --git a/Engine.Integration/Engine.Integration.MonoGame/MonoGameWindow.cs b/Engine.Integration/Engine.Integration.MonoGame/MonoGameWindow.cs
index 62e9ae5..8b8740c 100644
--- a/Engine.Integration/Engine.Integration.MonoGame/MonoGameWindow.cs
+++ b/Engine.Integration/Engine.Integration.MonoGame/MonoGameWindow.cs
@@ -21,6 +21,9 @@ public class MonoGameWindow : Game
 
         Universe.InstantiateUniverseObject().SetUniverseObject("Window Container")
             .BehaviourController.AddBehaviour<MonoGameWindowContainer>(this);
+
+        Universe.InstantiateUniverseObject().SetUniverseObject("Content Loader")
+            .BehaviourController.AddBehaviour<LoadContentManager>();
     }
 
     protected override void Initialize()