Add ParticleSystem, fix incorrect Argb conversion in Color, remove byte casting in LerpColor, update TestGame to demostrate particle system.

TestGame/TestGame.cs

@@ -4,6 +4,8 @@ using Voile.Resources;
 using Voile.SceneGraph;
 using Voile.Utils;
 using Voile.Input;
+using Voile.Systems;
+using System.Numerics;
 
 public class TestGame : Game
 {
@@ -12,9 +14,7 @@ public class TestGame : Game
     public override void Initialize()
     {
         InitializeDefault();
-
-        _audioSystem = new FmodAudioSystem();
-        _audioSystem.Start();
+        _particleSystem = new ParticleSystem();
     }
 
     protected override void LoadResources()
@@ -32,62 +32,50 @@ public class TestGame : Game
 
     protected override void Ready()
     {
-        _scene = new Scene(new SceneSettings()
+        _particleSystem!.CreateEmitter(Renderer.WindowSize / 2, new ParticleEmitterSettings()
         {
-            Renderer = Renderer,
-            AudioBackend = _audioSystem!,
-            InputHandler = Input,
-            ResourceManager = ResourceManager
+            ColorBegin = Color.Green,
+            ColorEnd = Color.Red,
+            EmitRadius = 128,
+            MaxParticles = 256
         });
-
-        _uiLayer = new UiLayer();
-        _worldLayer = new EntityLayer();
-
-        _testSoundInstance = _audioSystem!.CreateInstance(_testSound!);
-
-        Input.AddInputMapping("play", new InputAction[] { new KeyInputAction(KeyboardKey.Spacebar) });
-        Input.AddInputMapping("sprint", new InputAction[] { new KeyInputAction(KeyboardKey.LeftShift) });
-        Input.AddInputMapping("toggle_fullscreen", new InputAction[] { new KeyInputAction(KeyboardKey.F11) });
-
-        _scene!.AddLayer("World", _worldLayer!);
-
-        _worldLayer!.AddEntity(new World());
-        _worldLayer.AddEntity(new TestPlayer());
-
-        _scene.AddLayer("UI", _uiLayer!);
-        _scene.Start();
     }
 
     protected override void Run()
     {
         while (Renderer.ShouldRun)
         {
-            if (Input.IsActionPressed("play"))
-            {
-                _testSoundInstance!.PitchVariation(0.9f, 1.1f)
-                    .VolumeVariation(0.98f, 1.02f);
+            _particleSystem!.Update(Renderer.FrameTime);
 
-                _testSoundInstance!.Play();
+            Renderer.BeginFrame();
+            Renderer.ClearBackground(Color.Black);
+            foreach (var emitter in _particleSystem!.Emitters)
+            {
+                DrawEmitter(emitter);
             }
-            _scene.Update();
-            _scene.BeginDraw();
-            _scene.EndDraw();
+
+            Renderer.EndFrame();
         }
     }
 
     public override void Shutdown()
     {
         ShutdownDefault();
-        _audioSystem!.Dispose();
     }
 
-    private Sound? _testSound;
-    private SoundInstance? _testSoundInstance;
-    private Font? _font;
-    private FmodAudioSystem? _audioSystem;
-    private Scene? _scene;
+    private void DrawEmitter(ParticleEmitter emitter)
+    {
+        for (int i = 0; i < emitter.Particles.Length; i++)
+        {
+            var particle = emitter.Particles[i];
 
-    private UiLayer? _uiLayer;
-    private EntityLayer? _worldLayer;
+            var color = new Color(particle.ColorArgb);
+
+            Renderer.SetTransform(emitter.OriginPosition + particle.Position, Vector2.Zero);
+            Renderer.DrawCircle(16f * particle.Scale, color);
+        }
+    }
+
+    private ParticleSystem? _particleSystem;
     private Logger _logger = new(nameof(TestGame));
 }