feat: added support for multiple batches

Engine.Systems/Graphics/TriangleBatcher.cs

@@ -4,12 +4,12 @@ using Engine.Core;
 
 namespace Engine.Systems.Graphics;
 
-public class TriangleBatcher : Behaviour, IFirstFrameUpdate, IDraw
+public class TriangleBatcher : Behaviour, IFirstFrameUpdate, ILastFrameUpdate, IDraw
 {
     private static Comparer<int> SortByAscendingPriority() => Comparer<int>.Create((x, y) => x.CompareTo(y));
     private static System.Func<IBehaviour, int> GetPriority() => (b) => b.Priority;
 
-    private ITriangleBatch triangleBatch = null!;
+    private readonly BehaviourCollector<ITriangleBatch> triangleBatches = new();
     private ICamera camera = null!;
 
     private readonly ActiveBehaviourCollectorOrdered<int, IDrawableTriangle> drawableShapes = new(GetPriority(), SortByAscendingPriority());
@@ -18,16 +18,25 @@ public class TriangleBatcher : Behaviour, IFirstFrameUpdate, IDraw
     {
         camera = Universe.FindRequiredBehaviour<ICamera>();
 
-        triangleBatch = Universe.FindRequiredBehaviour<ITriangleBatch>();
-        drawableShapes.Unassign();
         drawableShapes.Assign(Universe);
+        triangleBatches.Assign(Universe);
     }
 
     public void Draw()
     {
+        for (int i = 0; i < triangleBatches.Count; i++)
+        {
+            ITriangleBatch triangleBatch = triangleBatches[i];
             triangleBatch.Begin(camera.ViewMatrix, camera.ProjectionMatrix);
-        for (int i = 0; i < drawableShapes.Count; i++)
-            drawableShapes[i].Draw(triangleBatch);
+            for (int j = 0; j < drawableShapes.Count; j++)
+                drawableShapes[j].Draw(triangleBatch);
             triangleBatch.End();
         }
+    }
+
+    public void LastActiveFrame()
+    {
+        triangleBatches.Unassign();
+        drawableShapes.Unassign();
+    }
 }