Added ECS stuff back

FinalEngine.ECS/Attributes/EntitySystemProcessAttribute.cs

@@ -0,0 +1,13 @@
+// <copyright file="EntitySystemProcessAttribute.cs" company="Software Antics">
+//     Copyright (c) Software Antics. All rights reserved.
+// </copyright>
+
+namespace FinalEngine.ECS.Attributes;
+
+using System;
+
+[AttributeUsage(AttributeTargets.Class, AllowMultiple = false)]
+public sealed class EntitySystemProcessAttribute : Attribute
+{
+    public GameLoopType ExecutionType { get; init; }
+}

FinalEngine.ECS/EntityWorld.cs

@@ -6,6 +6,8 @@ namespace FinalEngine.ECS;
 
 using System;
 using System.Collections.Generic;
+using System.Reflection;
+using FinalEngine.ECS.Attributes;
 using FinalEngine.ECS.Exceptions;
 
 public class EntityWorld : IEntityWorld
@@ -59,6 +61,27 @@ public void AddSystem(EntitySystemBase system)
         this.systems.Add(system);
     }
 
+    public void ProcessAll(GameLoopType type)
+    {
+        foreach (var system in this.systems)
+        {
+            var loopType = GameLoopType.Update;
+            var attribute = system.GetType().GetCustomAttribute<EntitySystemProcessAttribute>();
+
+            if (attribute != null)
+            {
+                loopType = attribute.ExecutionType;
+            }
+
+            if (loopType != type)
+            {
+                continue;
+            }
+
+            system.Process();
+        }
+    }
+
     public void RemoveEntity(Entity entity)
     {
         ArgumentNullException.ThrowIfNull(entity, nameof(entity));

FinalEngine.ECS/GameLoopType.cs

@@ -0,0 +1,12 @@
+// <copyright file="GameLoopType.cs" company="Software Antics">
+//     Copyright (c) Software Antics. All rights reserved.
+// </copyright>
+
+namespace FinalEngine.ECS;
+
+public enum GameLoopType
+{
+    Update,
+
+    Render,
+}

FinalEngine.ECS/IEntitySystemsProcessor.cs

@@ -0,0 +1,10 @@
+// <copyright file="IEntitySystemsProcessor.cs" company="Software Antics">
+//     Copyright (c) Software Antics. All rights reserved.
+// </copyright>
+
+namespace FinalEngine.ECS;
+
+public interface IEntitySystemsProcessor
+{
+    void ProcessAll(GameLoopType type);
+}

FinalEngine.ECS/IEntityWorld.cs

@@ -6,7 +6,7 @@ namespace FinalEngine.ECS;
 
 using System;
 
-public interface IEntityWorld
+public interface IEntityWorld : IEntitySystemsProcessor
 {
     void AddEntity(Entity entity);