Use ResourceRefs for RenderSystem, add IReloadableSystem, remove UI package.

TestGame/TestGame.cs

@@ -5,6 +5,7 @@ using Voile.Input;
 using Voile.Systems.Particles;
 using System.Numerics;
 using System.Diagnostics.CodeAnalysis;
+using System.Diagnostics;
 
 public class TestGame : Game
 {
@@ -19,6 +20,8 @@ public class TestGame : Game
         ResourceManager.AddResourceLoaderAssociation(new ParticleEmitterSettingsResourceLoader());
 
         Input.AddInputMapping("reload", new InputAction[] { new KeyInputAction(KeyboardKey.R) });
+
+        _particleSimStopwatch = new Stopwatch();
     }
 
     protected override void LoadResources()
@@ -28,10 +31,12 @@ public class TestGame : Game
 
         // }
 
-        // if (!ResourceManager.TryLoad("inter_regular", "fonts/Inter-Regular.ttf", out Font? _font))
-        // {
+        if (!ResourceManager.TryLoad("fonts/Inter-Regular.ttf", out _font))
+        {
 
-        // }
+        }
+
+        ResourceManager.TryLoad("icon.png", out _icon);
 
         if (!ResourceManager.TryLoad("test_emitter.toml", out _emitterSettings))
         {
@@ -54,7 +59,9 @@ public class TestGame : Game
                 _particleSystem!.RestartEmitter(_emitterId);
             }
 
+            _particleSimStopwatch = Stopwatch.StartNew();
             _particleSystem!.Update(Renderer.FrameTime);
+            _particleSimStopwatch.Stop();
 
             Renderer.BeginFrame();
             Renderer.ClearBackground(Color.Black);
@@ -63,7 +70,14 @@ public class TestGame : Game
                 DrawEmitter(emitter);
             }
 
+            Renderer.SetTransform(Renderer.WindowSize / 2, Vector2.Zero);
+            Renderer.DrawTexture(_icon, Color.White);
+
+            Renderer.ResetTransform();
+            Renderer.DrawText(_font, $"Particle Sim: {TimeSpan.FromTicks(_particleSimStopwatch.ElapsedTicks).TotalMilliseconds} ms", Color.White);
+
             Renderer.EndFrame();
+            _particleSimStopwatch.Restart();
         }
     }
 
@@ -90,7 +104,11 @@ public class TestGame : Game
     }
 
     [NotNull] private ParticleSystem _particleSystem;
+
+    private Stopwatch _particleSimStopwatch;
     private int _emitterId;
     private ResourceRef<ParticleEmitterSettingsResource> _emitterSettings;
+    private ResourceRef<Font> _font;
+    private ResourceRef<Texture2d> _icon;
     private Logger _logger = new(nameof(TestGame));
 }