docs: added documentation to draw & update interfaces

Engine.Core/Systems/Abstract/IDraw.cs

@@ -1,6 +1,12 @@
 namespace Syntriax.Engine.Core;
 
+/// <summary>
+/// Represents a <see cref="IBehaviour"/> to be notified when the draw phase of the <see cref="IUniverse"/> occurs.
+/// </summary>
 public interface IDraw : IBehaviour
 {
+    /// <summary>
+    /// Calls draw logic for the <see cref="IBehaviour"/> to be displayed visually.
+    /// </summary>
     void Draw();
 }

Engine.Core/Systems/Abstract/IPostDraw.cs

@@ -1,6 +1,12 @@
 namespace Syntriax.Engine.Core;
 
+/// <summary>
+/// Represents a <see cref="IBehaviour"/> to be notified after the draw phase of the <see cref="IUniverse"/> occurs.
+/// </summary>
 public interface IPostDraw : IBehaviour
 {
+    /// <summary>
+    /// Updates the state of the <see cref="IBehaviour"/> after the main draw phase happens.
+    /// </summary>
     void PostDraw();
 }

Engine.Core/Systems/Abstract/IPostUpdate.cs

@@ -1,6 +1,12 @@
 namespace Syntriax.Engine.Core;
 
+/// <summary>
+/// Represents a <see cref="IBehaviour"/> to be notified after the update phase of the <see cref="IUniverse"/> occurs.
+/// </summary>
 public interface IPostUpdate : IBehaviour
 {
+    /// <summary>
+    /// Updates the state of the <see cref="IBehaviour"/> after the main update phase happens.
+    /// </summary>
     void PostUpdate();
 }

Engine.Core/Systems/Abstract/IPreDraw.cs

@@ -1,6 +1,12 @@
 namespace Syntriax.Engine.Core;
 
+/// <summary>
+/// Represents a <see cref="IBehaviour"/> to be notified before the draw phase of the <see cref="IUniverse"/> occurs.
+/// </summary>
 public interface IPreDraw : IBehaviour
 {
+    /// <summary>
+    /// Updates the state of the <see cref="IBehaviour"/> before the main draw phase happens.
+    /// </summary>
     void PreDraw();
 }

Engine.Core/Systems/Abstract/IPreUpdate.cs

@@ -1,6 +1,12 @@
 namespace Syntriax.Engine.Core;
 
+/// <summary>
+/// Represents a <see cref="IBehaviour"/> to be notified before the update phase of the <see cref="IUniverse"/> occurs.
+/// </summary>
 public interface IPreUpdate : IBehaviour
 {
+    /// <summary>
+    /// Updates the state of the <see cref="IBehaviour"/> before the main update phase happens.
+    /// </summary>
     void PreUpdate();
 }

Engine.Core/Systems/Abstract/IUpdate.cs

@@ -1,6 +1,12 @@
 namespace Syntriax.Engine.Core;
 
+/// <summary>
+/// Represents a <see cref="IBehaviour"/> to be notified when the update phase of the <see cref="IUniverse"/> occurs.
+/// </summary>
 public interface IUpdate : IBehaviour
 {
+    /// <summary>
+    /// Updates the state of the <see cref="IBehaviour"/>.
+    /// </summary>
     void Update();
 }

Engine.Core/Systems/DrawManager.cs

@@ -3,9 +3,11 @@ namespace Syntriax.Engine.Core;
 
 public class DrawManager : UniverseObject
 {
-    private readonly BehaviourCollector<IPreDraw> preDrawEntities = new();
+    private static System.Comparison<IBehaviour> SortByPriority() => (x, y) => y.Priority.CompareTo(x.Priority);
-    private readonly BehaviourCollector<IDraw> drawEntities = new();
+
-    private readonly BehaviourCollector<IPostDraw> postDrawEntities = new();
+    private readonly ActiveBehaviourCollectorSorted<IPreDraw> preDrawEntities = new() { SortBy = SortByPriority() };
+    private readonly ActiveBehaviourCollectorSorted<IDraw> drawEntities = new() { SortBy = SortByPriority() };
+    private readonly ActiveBehaviourCollectorSorted<IPostDraw> postDrawEntities = new() { SortBy = SortByPriority() };
 
     private void OnPreDraw(IUniverse sender)
     {

Engine.Core/Systems/UpdateManager.cs

@@ -5,10 +5,12 @@ namespace Syntriax.Engine.Core;
 
 public class UpdateManager : UniverseObject
 {
-    private readonly BehaviourCollector<IFirstFrameUpdate> firstFrameUpdates = new();
+    private static System.Comparison<IBehaviour> SortByPriority() => (x, y) => y.Priority.CompareTo(x.Priority);
-    private readonly BehaviourCollector<IPreUpdate> preUpdateEntities = new();
+
-    private readonly BehaviourCollector<IUpdate> updateEntities = new();
+    private readonly ActiveBehaviourCollectorSorted<IFirstFrameUpdate> firstFrameUpdates = new() { SortBy = SortByPriority() };
-    private readonly BehaviourCollector<IPostUpdate> postUpdateEntities = new();
+    private readonly ActiveBehaviourCollectorSorted<IPreUpdate> preUpdateEntities = new() { SortBy = SortByPriority() };
+    private readonly ActiveBehaviourCollectorSorted<IUpdate> updateEntities = new() { SortBy = SortByPriority() };
+    private readonly ActiveBehaviourCollectorSorted<IPostUpdate> postUpdateEntities = new() { SortBy = SortByPriority() };
 
     private readonly List<IFirstFrameUpdate> toCallFirstFrameUpdates = [];
 

Engine.Physics2D/Abstract/Updates/IPostPhysicsUpdate.cs

@@ -0,0 +1,15 @@
+using Syntriax.Engine.Core;
+
+namespace Syntriax.Engine.Physics2D;
+
+/// <summary>
+/// Represents a <see cref="IBehaviour"/> that listens to the phase after the physics simulation phase.
+/// </summary>
+public interface IPostPhysicsUpdate : IBehaviour
+{
+    /// <summary>
+    /// Execute logic that should occur after the physics simulation has been updated.
+    /// </summary>
+    /// <param name="delta">The time elapsed since the last physics update, typically in seconds.</param>
+    void PostPhysicsUpdate(float delta);
+}

Engine.Physics2D/Abstract/Updates/IPrePhysicsUpdate.cs

@@ -0,0 +1,15 @@
+using Syntriax.Engine.Core;
+
+namespace Syntriax.Engine.Physics2D;
+
+/// <summary>
+/// Represents a <see cref="IBehaviour"/> that listens to the phase before the physics simulation phase.
+/// </summary>
+public interface IPrePhysicsUpdate : IBehaviour
+{
+    /// <summary>
+    /// Execute logic that should occur before the physics simulation is updated.
+    /// </summary>
+    /// <param name="delta">The time elapsed since the last physics update, typically in seconds.</param>
+    void PrePhysicsUpdate(float delta);
+}

Engine.Physics2D/PhysicsEngine2D.cs

@@ -14,9 +14,12 @@ public class PhysicsEngine2D : UniverseObject, IPhysicsEngine2D
     protected readonly ICollisionDetector2D collisionDetector = null!;
     protected readonly ICollisionResolver2D collisionResolver = null!;
 
+    private static System.Comparison<IBehaviour> SortByPriority() => (x, y) => y.Priority.CompareTo(x.Priority);
+    protected ActiveBehaviourCollectorSorted<IPrePhysicsUpdate> physicsPreUpdateCollector = new() { SortBy = SortByPriority() };
+    protected ActiveBehaviourCollectorSorted<IPhysicsUpdate> physicsUpdateCollector = new() { SortBy = SortByPriority() };
+    protected ActiveBehaviourCollectorSorted<IPostPhysicsUpdate> physicsPostUpdateCollector = new() { SortBy = SortByPriority() };
     protected BehaviourCollector<IRigidBody2D> rigidBodyCollector = new();
     protected BehaviourCollector<ICollider2D> colliderCollector = new();
-    protected BehaviourCollector<IPhysicsUpdate> physicsUpdateCollector = new();
 
     public int IterationPerStep { get => _iterationPerStep; set => _iterationPerStep = value < 1 ? 1 : value; }
     public float IterationPeriod { get => _iterationPeriod; set => _iterationPeriod = value.Max(0.0001f); }
@@ -25,6 +28,12 @@ public class PhysicsEngine2D : UniverseObject, IPhysicsEngine2D
     {
         float intervalDeltaTime = deltaTime / IterationPerStep;
 
+        foreach (IPrePhysicsUpdate physicsPreUpdate in physicsPreUpdateCollector)
+            physicsPreUpdate.PrePhysicsUpdate(deltaTime);
+
+        foreach (IPhysicsUpdate physicsUpdate in physicsUpdateCollector)
+            physicsUpdate.PhysicsUpdate(deltaTime);
+
         for (int iterationIndex = 0; iterationIndex < IterationPerStep; iterationIndex++)
         {
             // Can Parallel
@@ -92,8 +101,8 @@ public class PhysicsEngine2D : UniverseObject, IPhysicsEngine2D
             OnPhysicsIteration?.InvokeSafe(this, intervalDeltaTime);
         }
 
-        foreach (IPhysicsUpdate physicsUpdate in physicsUpdateCollector)
+        foreach (IPostPhysicsUpdate physicsPostUpdate in physicsPostUpdateCollector)
-            physicsUpdate.PhysicsUpdate(deltaTime);
+            physicsPostUpdate.PostPhysicsUpdate(deltaTime);
 
         OnPhysicsStep?.InvokeSafe(this, deltaTime);
     }
@@ -109,7 +118,9 @@ public class PhysicsEngine2D : UniverseObject, IPhysicsEngine2D
 
     protected override void OnEnteringUniverse(IUniverse universe)
     {
+        physicsPreUpdateCollector.Assign(universe);
         physicsUpdateCollector.Assign(universe);
+        physicsPostUpdateCollector.Assign(universe);
         colliderCollector.Assign(universe);
         rigidBodyCollector.Assign(universe);
 
@@ -118,7 +129,9 @@ public class PhysicsEngine2D : UniverseObject, IPhysicsEngine2D
 
     protected override void OnExitingUniverse(IUniverse universe)
     {
+        physicsPreUpdateCollector.Unassign();
         physicsUpdateCollector.Unassign();
+        physicsPostUpdateCollector.Unassign();
         colliderCollector.Unassign();
         rigidBodyCollector.Unassign();