WIP: ResourceManager refactor, hot reloading using ResourceRef, API changes.

TODO.md

@@ -4,9 +4,9 @@
 
 - ~~Add and implement interfaces for systems (ISystem, IUpdatableSystem, etc.)~~
 - Minimize amount of possible null references.
-- Serialization and deserialization of Resources from and to TOML files.
+- TextDataResource providing a convenient wrapper around TOML data files.
 - Add documentation for common classes.
-- Hot reloading of resources.
+- ~~Hot reloading of resources.~~
 
 ## I/O
 

TestGame/Resources/test_emitter.toml

@@ -0,0 +1,11 @@
+[ParticleEmitterSettings]
+
+MaxParticles = 1024
+EmitRadius = 128
+LifeTime = 0.5
+Direction = { x = 0.0, y = 1.0 }
+LinearVelocity = 980.0
+ScaleBegin = 1.0
+ScaleEnd = 0.0
+ColorBegin = { r = 0.0, g = 1.0, b = 0.0, a = 1.0 }
+ColorEnd = { r = 1.0, g = 0.0, b = 0.0, a = 1.0 }

TestGame/TestGame.cs

@@ -15,16 +15,25 @@ public class TestGame : Game
     {
         InitializeDefault();
         _particleSystem = new ParticleSystem();
+
+        ResourceManager.AddResourceLoaderAssociation(new ParticleEmitterSettingsResourceLoader());
+
+        Input.AddInputMapping("reload", new InputAction[] { new KeyInputAction(KeyboardKey.R) });
     }
 
     protected override void LoadResources()
     {
-        if (!ResourceManager.TryLoad("my_sound", "sounds/test_sound.ogg", out Sound? _testSound))
+        // if (!ResourceManager.TryLoad("my_sound", "sounds/test_sound.ogg", out Sound? _testSound))
-        {
+        // {
 
-        }
+        // }
 
-        if (!ResourceManager.TryLoad("inter_regular", "fonts/Inter-Regular.ttf", out Font? _font))
+        // if (!ResourceManager.TryLoad("inter_regular", "fonts/Inter-Regular.ttf", out Font? _font))
+        // {
+
+        // }
+
+        if (!ResourceManager.TryLoad("test_emitter.toml", out _emitterSettings))
         {
 
         }
@@ -32,19 +41,19 @@ public class TestGame : Game
 
     protected override void Ready()
     {
-        _particleSystem!.CreateEmitter(Renderer.WindowSize / 2, new ParticleEmitterSettings()
+        _emitterId = _particleSystem!.CreateEmitter(Renderer.WindowSize / 2, _emitterSettings);
-        {
-            ColorBegin = Color.Green,
-            ColorEnd = Color.Red,
-            EmitRadius = 128,
-            MaxParticles = 256
-        });
     }
 
     protected override void Run()
     {
         while (Renderer.ShouldRun)
         {
+            if (Input.IsActionPressed("reload"))
+            {
+                ResourceManager.Reload();
+                _particleSystem!.RestartEmitter(_emitterId);
+            }
+
             _particleSystem!.Update(Renderer.FrameTime);
 
             Renderer.BeginFrame();
@@ -77,5 +86,7 @@ public class TestGame : Game
     }
 
     private ParticleSystem? _particleSystem;
+    private int _emitterId;
+    private ResourceRef<ParticleEmitterSettingsResource>? _emitterSettings;
     private Logger _logger = new(nameof(TestGame));
 }

Voile/Source/Resources/Font.cs

@@ -7,7 +7,12 @@ public class Font : Resource
     /// </summary>
     internal int Handle { get; set; } = -1;
     public int Size { get; set; } = 16;
-    public Font(string path, byte[] buffer) : base(path, buffer)
+
+    public byte[]? Buffer { get; private set; }
+    public long BufferSize { get; set; }
+
+    public Font(string path, byte[] buffer) : base(path)
     {
+        Buffer = buffer;
     }
 }

Voile/Source/Resources/Loaders/FontLoader.cs

@@ -1,13 +1,15 @@
+
 namespace Voile.Resources;
 
-public class FontLoader : IResourceLoader<Font>
+public class FontLoader : ResourceLoader<Font>
 {
-    public IEnumerable<string> SupportedExtensions => new string[]
+    public override IEnumerable<string> SupportedExtensions => new string[]
     {
         "ttf"
     };
 
-    public Font Load(string path)
+
+    protected override Font LoadResource(string path)
     {
         byte[] fileBuffer = File.ReadAllBytes(path);
         var result = new Font(path, fileBuffer);

Voile/Source/Resources/Loaders/IResourceLoader.cs

@@ -1,8 +0,0 @@
-namespace Voile.Resources
-{
-    public interface IResourceLoader<T> where T : Resource
-    {
-        public IEnumerable<string> SupportedExtensions { get; }
-        public T Load(string path);
-    }
-}

Voile/Source/Resources/Loaders/ResourceLoader.cs

@@ -0,0 +1,69 @@
+
+using System.Diagnostics.CodeAnalysis;
+
+namespace Voile.Resources
+{
+    public abstract class ResourceLoader<T> where T : Resource
+    {
+        public abstract IEnumerable<string> SupportedExtensions { get; }
+
+        public Guid Load(string path)
+        {
+            var resource = LoadResource(path);
+            var guid = Guid.NewGuid();
+
+            var oldResourceGuid = _loadedResources.FirstOrDefault(loadedResource => loadedResource.Value.Path == path).Key;
+
+            if (_loadedResources.ContainsKey(oldResourceGuid))
+            {
+                _loadedResources[oldResourceGuid] = resource;
+                return oldResourceGuid;
+            }
+
+            _loadedResources.Add(guid, resource);
+
+            return guid;
+        }
+
+        public void Reload()
+        {
+            foreach (var loadedResource in _loadedResources)
+            {
+                Load(loadedResource.Value.Path);
+            }
+        }
+
+        public bool TryGet(Guid resourceGuid, [NotNullWhen(true)] out T? resource)
+        {
+            resource = default;
+
+            if (!_loadedResources.ContainsKey(resourceGuid))
+            {
+                return false;
+            }
+
+            resource = _loadedResources[resourceGuid];
+
+            return true;
+        }
+
+        public bool TryUnload(Guid resourceGuid)
+        {
+            if (!_loadedResources.ContainsKey(resourceGuid))
+            {
+                return false;
+            }
+
+            var resource = _loadedResources[resourceGuid];
+
+            _loadedResources.Remove(resourceGuid);
+            resource.Dispose();
+
+            return true;
+        }
+
+        protected abstract T LoadResource(string path);
+
+        protected Dictionary<Guid, T> _loadedResources = new();
+    }
+}

Voile/Source/Resources/Loaders/SoundLoader.cs

@@ -2,14 +2,14 @@ using StbVorbisSharp;
 
 namespace Voile.Resources
 {
-    public class SoundLoader : IResourceLoader<Sound>
+    public class SoundLoader : ResourceLoader<Sound>
     {
-        public IEnumerable<string> SupportedExtensions => new string[]
+        public override IEnumerable<string> SupportedExtensions => new string[]
         {
             "ogg"
         };
 
-        public Sound Load(string path)
+        protected override Sound LoadResource(string path)
         {
             Vorbis vorbis;
             Sound result;

Voile/Source/Resources/Loaders/Texture2dLoader.cs

@@ -3,16 +3,16 @@ using StbImageSharp;
 
 namespace Voile
 {
-    public class Texture2dLoader : IResourceLoader<Texture2d>
+    public class Texture2dLoader : ResourceLoader<Texture2d>
     {
-        public IEnumerable<string> SupportedExtensions => new string[]
+        public override IEnumerable<string> SupportedExtensions => new string[]
         {
             ".png",
             ".jpg",
             ".jpeg"
         };
 
-        public Texture2d Load(string path)
+        protected override Texture2d LoadResource(string path)
         {
             ImageResult image;
             using (var stream = File.OpenRead(path))

Voile/Source/Resources/Resource.cs

@@ -1,34 +1,34 @@
-using System.Text.Json.Serialization;
+using Voile.Resources;
 
 namespace Voile
 {
+    /// <summary>
+    /// Wraps a reference to an asset of a given type.
+    /// </summary>
+    /// <typeparam name="T"></typeparam>
+    public sealed class ResourceRef<T> where T : Resource
+    {
+        public readonly Guid Guid = Guid.Empty;
+        public bool HasValue => Guid != Guid.Empty;
+        public T Value => ResourceManager.GetResource<T>(Guid);
+
+        public ResourceRef(Guid guid)
+        {
+            Guid = guid;
+        }
+    }
+
     public abstract class Resource : IDisposable
     {
-        public Guid Guid { get; set; } = Guid.NewGuid();
+        public string Path { get; private set; } = string.Empty;
 
-        public string? Path { get => _path; set => _path = value; }
+        public Resource(string path)
-
-        [JsonIgnore]
-        public byte[]? Buffer { get => _buffer; set => _buffer = value; }
-
-        [JsonIgnore]
-        public long BufferSize { get; set; }
-
-        public Resource(string path, byte[] buffer)
         {
-            _path = path;
+            Path = path;
-            _buffer = buffer;
-
-            BufferSize = buffer.Length;
         }
 
         public void Dispose()
         {
-            Buffer = null;
-            Path = null;
         }
-
-        private string? _path;
-        private byte[]? _buffer;
     }
 }

Voile/Source/Resources/ResourceManager.cs

@@ -6,9 +6,13 @@ namespace Voile.Resources
 {
     public class ResourceManager : IDisposable
     {
-        public string ResourceRoot { get; set; } = "Resources/";
+        public static string ResourceRoot { get; set; } = "Resources/";
 
-        public bool TryLoad<T>(string resourceId, string path, [NotNullWhen(true)] out T? result) where T : Resource
+        public static Action<string>? OnLoadRequested;
+        public static Action<Guid>? OnUnloadRequested;
+        public static Action? OnReloaded;
+
+        public static bool TryLoad<T>(string path, [NotNullWhen(true)] out ResourceRef<T>? result) where T : Resource
         {
             T? resource = default;
             result = null;
@@ -22,9 +26,9 @@ namespace Voile.Resources
                 return false;
             }
 
-            _logger.Info($"Loading {path} as {typeof(T)} with id \"{resourceId}\"...");
+            _logger.Info($"Loading {path} as {typeof(T)}...");
 
-            if (!TryGetLoader(out IResourceLoader<T>? loader))
+            if (!TryGetLoader(out ResourceLoader<T>? loader))
             {
                 return false;
             }
@@ -37,34 +41,58 @@ namespace Voile.Resources
                 _logger.Error($"Extension {extension} is not supported!");
             }
 
-            if (loader.Load(fullPath) is not T loadedResource)
+            var resourceGuid = loader.Load(fullPath);
+
+            if (!loader.TryGet(resourceGuid, out T? loadedResource))
             {
+                _logger.Error($"Failed to load resource at path \"{path}\"!");
                 return false;
             }
 
             resource = loadedResource;
-            _loadedResources.Add(resourceId, resource);
 
-            _logger.Info($"\"{resourceId}\" was loaded successfully.");
+            _resourcePathMap.Add(path, resourceGuid);
 
-            result = loadedResource;
+            _logger.Info($"\"{path}\" ({resourceGuid}) was loaded successfully.");
+
+            result = new ResourceRef<T>(resourceGuid);
             return true;
         }
 
+        public void Reload()
+        {
+            _logger.Info("Reloading resources.");
+            OnReloaded?.Invoke();
+        }
+
+        // TODO
         public bool TryUnload(string resourceId)
         {
             _logger.Info($"Unloading resource with id \"{resourceId}\"...");
 
-            if (!_loadedResources.ContainsKey(resourceId))
+            // if (!_resourceStringMap.TryGetValue(resourceId, out Guid guid))
-            {
+            // {
-                _logger.Error($"Cannot unload resource with id \"{resourceId}\": resource doesn't exist!");
+            //     _logger.Error($"Resource with ID \"{resourceId}\" doesn't exist!");
-                return false;
+            //     return false;
-            }
+            // }
 
-            var resource = _loadedResources[resourceId];
+            return true;
+        }
 
-            _loadedResources.Remove(resourceId);
+        // TODO
-            resource.Dispose();
+        public bool TryUnload(Guid resourceGuid)
+        {
+            _logger.Info($"Unloading resource with guid \"{resourceGuid}\"...");
+
+            // if (!_loadedResources.ContainsKey(resourceGuid))
+            // {
+            //     _logger.Error($"Cannot unload resource with id \"{resourceGuid}\": resource doesn't exist!");
+            //     return false;
+            // }
+            // var resource = _loadedResources[resourceGuid];
+
+            // _loadedResources.Remove(resourceGuid);
+            // resource.Dispose();
 
             return true;
         }
@@ -94,11 +122,17 @@ namespace Voile.Resources
                 return false;
             }
 
-            var expectedResource = _loadedResources[resourceId];
+            var resourceGuid = _resourcePathMap[resourceId];
 
-            if (expectedResource is not T loadedResource)
+            if (!TryGetLoader(out ResourceLoader<T>? loader))
             {
-                _logger.Error($"Given resource is of wrong type: provided {typeof(T)}, expected {expectedResource.GetType()}!");
+                _logger.Error($"No loader available for type {typeof(T)}!");
+                return false;
+            }
+
+            if (!loader.TryGet(resourceGuid, out T? loadedResource))
+            {
+                _logger.Error($"No resource with id {resourceId} found!");
                 return false;
             }
 
@@ -107,11 +141,29 @@ namespace Voile.Resources
             return true;
         }
 
-        public bool IsResourceLoaded(string resourceId) => _loadedResources.ContainsKey(resourceId);
+        public static T GetResource<T>(Guid resourceGuid) where T : Resource
+        {
+            if (!TryGetLoader(out ResourceLoader<T>? loader))
+            {
+                throw new Exception($"No loader available for type {typeof(T)}!");
+            }
 
-        public void AddResourceLoaderAssociation<T>(IResourceLoader<T> loader) where T : Resource
+            if (!loader.TryGet(resourceGuid, out T? loadedResource))
+            {
+                throw new Exception($"No resource with GUID \"{resourceGuid}\" found!");
+            }
+
+            return loadedResource;
+        }
+
+        public bool IsResourceLoaded(string resourceId) => _resourcePathMap.ContainsKey(resourceId);
+
+        public static void AddResourceLoaderAssociation<T>(ResourceLoader<T> loader) where T : Resource
         {
             _logger.Info($"Added resource loader association for {typeof(T)}.");
+
+            OnReloaded += loader.Reload;
+
             _resourceLoaderAssociations.Add(typeof(T), loader);
         }
 
@@ -121,7 +173,28 @@ namespace Voile.Resources
             _resourceSaverAssociations.Add(typeof(T), saver);
         }
 
-        private bool TryGetLoader<T>([NotNullWhen(true)] out IResourceLoader<T>? loader) where T : Resource
+        public void EnableFileWatching()
+        {
+            _fileWatcher = new FileSystemWatcher(ResourceRoot);
+
+            _fileWatcher.NotifyFilter = NotifyFilters.Attributes
+                         | NotifyFilters.CreationTime
+                         | NotifyFilters.DirectoryName
+                         | NotifyFilters.FileName
+                         | NotifyFilters.LastAccess
+                         | NotifyFilters.LastWrite
+                         | NotifyFilters.Security
+                         | NotifyFilters.Size;
+
+            _fileWatcher.IncludeSubdirectories = true;
+            _fileWatcher.EnableRaisingEvents = true;
+
+            _fileWatcher.Changed += FileSystemChanged;
+
+            _logger.Info("File watching enabled.");
+        }
+
+        private static bool TryGetLoader<T>([NotNullWhen(true)] out ResourceLoader<T>? loader) where T : Resource
         {
             loader = null;
 
@@ -131,13 +204,9 @@ namespace Voile.Resources
                 return false;
             }
 
-            loader = _resourceLoaderAssociations[typeof(T)] as IResourceLoader<T>;
+            loader = _resourceLoaderAssociations[typeof(T)] as ResourceLoader<T>;
 
-            if (loader is not null)
+            if (loader is null)
-            {
-                _logger.Info($"Using {loader.GetType()} for loading...");
-            }
-            else
             {
                 _logger.Error($"No loader association found for {typeof(T)}.");
                 return false;
@@ -171,31 +240,42 @@ namespace Voile.Resources
             return true;
         }
 
-        public void Dispose()
+        private void FileSystemChanged(object sender, FileSystemEventArgs e)
         {
-            foreach (var resource in _loadedResources)
+            if (e.ChangeType != WatcherChangeTypes.Changed)
             {
-                TryUnload(resource.Key);
+                return;
             }
 
-            GC.SuppressFinalize(this);
+            Reload();
+        }
+
+        public void Dispose()
+        {
+            // foreach (var loader in _)
+            // {
+            //     TryUnload(resource.Key);
+            // }
+
+            // GC.SuppressFinalize(this);
         }
 
 
-        private Logger _logger = new(nameof(ResourceManager));
+        private static Logger _logger = new(nameof(ResourceManager));
 
-        private readonly Dictionary<Type, object> _resourceLoaderAssociations = new()
+        private static readonly Dictionary<Type, object> _resourceLoaderAssociations = new()
         {
             {typeof(Sound), new SoundLoader()},
             {typeof(Texture2d), new Texture2dLoader()},
             {typeof(Font), new FontLoader()}
         };
 
-        private readonly Dictionary<Type, object> _resourceSaverAssociations = new()
+        private static readonly Dictionary<Type, object> _resourceSaverAssociations = new()
         {
 
         };
 
-        private Dictionary<string, Resource> _loadedResources = new();
+        private FileSystemWatcher? _fileWatcher;
+        private static Dictionary<string, Guid> _resourcePathMap = new();
     }
 }

Voile/Source/Resources/Sound.cs

@@ -5,8 +5,12 @@ namespace Voile
         public SoundFormat Format { get; set; }
         public int SampleRate { get; set; }
 
-        public Sound(string path, byte[] buffer) : base(path, buffer)
+        public byte[]? Buffer { get; private set; }
+        public long BufferSize { get; set; }
+
+        public Sound(string path, byte[] buffer) : base(path)
         {
+            Buffer = buffer;
         }
     }
 

Voile/Source/Resources/Texture2d.cs

@@ -9,9 +9,14 @@ namespace Voile
         public int Width { get; set; }
         public int Height { get; set; }
         public int Mipmaps { get; set; } = 1;
+
+        public byte[]? Buffer { get; private set; }
+        public long BufferSize { get; set; }
+
         public TextureFormat Format { get; set; } = TextureFormat.UncompressedR8G8B8A8;
-        public Texture2d(string path, byte[] buffer) : base(path, buffer)
+        public Texture2d(string path, byte[] buffer) : base(path)
         {
+            Buffer = buffer;
         }
 
         public static Texture2d Empty => new Texture2d(string.Empty, new byte[] { });

Voile/Source/SceneGraph/Resources/SerializedScene.cs

@@ -6,8 +6,12 @@ namespace Voile.SceneGraph
     {
         public Dictionary<string, Layer> Layers { get; set; }
 
-        public SerializedScene(string path, byte[] buffer) : base(path, buffer)
+        public byte[]? Buffer { get; set; }
+        public long BufferSize { get; set; }
+
+        public SerializedScene(string path, byte[] buffer) : base(path)
         {
+            Buffer = buffer;
         }
     }
 

Voile/Source/Systems/ParticleSystem.cs

@@ -1,5 +1,7 @@
+using System.ComponentModel;
 using System.Numerics;
-using Voile.Rendering;
+using Tommy;
+using Voile.Resources;
 using Voile.Utils;
 
 namespace Voile.Systems;
@@ -41,18 +43,71 @@ public class ParticleEmitterSettings
     public float Damping { get; set; } = 1.0f;
 }
 
+public class ParticleEmitterSettingsResource : Resource
+{
+    public ParticleEmitterSettings Settings { get; private set; }
+    public ParticleEmitterSettingsResource(string path, ParticleEmitterSettings settings) : base(path)
+    {
+        Settings = settings;
+    }
+
+}
+
+public class ParticleEmitterSettingsResourceLoader : ResourceLoader<ParticleEmitterSettingsResource>
+{
+    public override IEnumerable<string> SupportedExtensions => new string[] {
+        "toml"
+    };
+
+    protected override ParticleEmitterSettingsResource LoadResource(string path)
+    {
+        // TODO: this is ugly, better to make some sort of wrapper API for TOML files.
+        var settings = new ParticleEmitterSettings();
+        // Parse into a node
+        using (StreamReader reader = File.OpenText(path))
+        {
+            // Parse the table
+            TomlTable table = TOML.Parse(reader);
+
+            if (!table.HasKey("ParticleEmitterSettings"))
+            {
+                Console.WriteLine("Particle emitter settings doesnt have a header!");
+            }
+
+            if (table["ParticleEmitterSettings"]["MaxParticles"] is TomlInteger maxParticles)
+            {
+                settings.MaxParticles = (int)maxParticles.Value;
+            }
+
+            if (table["ParticleEmitterSettings"]["EmitRadius"] is TomlInteger emitRadius)
+            {
+                settings.EmitRadius = (int)emitRadius.Value;
+            }
+
+            if (table["ParticleEmitterSettings"]["LifeTime"] is TomlFloat lifetime)
+            {
+                settings.LifeTime = (float)lifetime.Value;
+            }
+
+        }
+
+        return new ParticleEmitterSettingsResource(path, settings);
+    }
+}
+
 public class ParticleEmitter : IUpdatableSystem
 {
     public ReadOnlySpan<Particle> Particles => _particles.AsSpan();
     public Vector2 OriginPosition => _originPosition;
-    public ParticleEmitterSettings Settings => _settings;
+    public ParticleEmitterSettings Settings => _settingsResource.Value.Settings;
+    public int ParticleArrayOffset => _particles.Offset;
 
-    public ParticleEmitter(Vector2 originPosition, ParticleEmitterSettings settings, ArraySegment<Particle> particles)
+    public ParticleEmitter(Vector2 originPosition, ResourceRef<ParticleEmitterSettingsResource> settingsResource, ArraySegment<Particle> particles)
     {
         _originPosition = originPosition;
 
-        _settings = settings;
+        _settingsResource = settingsResource;
-        _maxParticles = _settings.MaxParticles;
+        _maxParticles = _settingsResource.Value.Settings.MaxParticles;
         _particleIndex = _maxParticles - 1;
 
         _particles = particles;
@@ -60,9 +115,29 @@ public class ParticleEmitter : IUpdatableSystem
         _random = new LehmerRandom();
     }
 
+    public void Restart(ArraySegment<Particle> particles)
+    {
+        // foreach (var particle in _particles)
+        // {
+        //     particle.LifeTimeRemaining = 0.0f;
+        // }
+
+        for (int i = 0; i < _particles.Count; i++)
+        {
+            var particle = _particles[i];
+            particle.LifeTimeRemaining = 0.0f;
+        }
+
+        _particles = particles;
+
+        _maxParticles = Settings.MaxParticles;
+        _particleIndex = _maxParticles - 1;
+    }
+
     public void Update(double deltaTime)
     {
-        var rate = (int)MathUtils.Lerp(1, _maxParticles, _settings.Explosiveness);
+        var rate = (int)MathUtils.Lerp(1, _maxParticles, Settings.Explosiveness);
+
         for (int i = 0; i < rate; i++)
         {
             Emit();
@@ -71,19 +146,19 @@ public class ParticleEmitter : IUpdatableSystem
         for (int i = 0; i < _maxParticles; i++)
         {
             var particle = _particles[i];
-            if (!particle.Alive) continue;
+            // if (!particle.Alive) continue;
 
-            if (particle.LifeTimeRemaining <= 0.0f)
+            // if (particle.LifeTimeRemaining <= 0.0f)
-            {
+            // {
-                particle.Alive = false;
+            //     particle.Alive = false;
-                continue;
+            //     continue;
-            }
+            // }
 
             particle.LifeTimeRemaining = Math.Clamp(particle.LifeTimeRemaining - (float)deltaTime, 0.0f, particle.LifeTime);
 
             var t = particle.LifeTimeRemaining / particle.LifeTime;
 
-            particle.Velocity += _settings.Gravity * (float)deltaTime;
+            particle.Velocity += Settings.Gravity * (float)deltaTime;
             particle.Position += particle.Velocity * (float)deltaTime;
             particle.Rotation += particle.AngularVelocity * (float)deltaTime;
             particle.Scale = MathUtils.Lerp(Settings.ScaleEnd, Settings.ScaleBegin, t);
@@ -91,7 +166,7 @@ public class ParticleEmitter : IUpdatableSystem
             var color = MathUtils.LerpColor(Settings.ColorEnd, Settings.ColorBegin, t);
             particle.ColorArgb = color.Argb;
 
-            particle.Velocity -= particle.Velocity * _settings.Damping * (float)deltaTime;
+            particle.Velocity -= particle.Velocity * Settings.Damping * (float)deltaTime;
 
             _particles[i] = particle;
         }
@@ -101,16 +176,17 @@ public class ParticleEmitter : IUpdatableSystem
     {
         Particle particle = _particles[_particleIndex];
         if (!(particle.LifeTimeRemaining <= 0)) return;
-        particle.Alive = true;
+
+        // particle.Alive = true;
         particle.Position = GetEmitPosition();
-        particle.Velocity = _settings.Direction * _settings.LinearVelocity;
+        particle.Velocity = Settings.Direction * Settings.LinearVelocity;
 
-        particle.Velocity += Vector2.One * _settings.LinearVelocityRandom * ((float)_random.NextDouble() - 0.5f);
+        particle.Velocity += Vector2.One * Settings.LinearVelocityRandom * ((float)_random.NextDouble() - 0.5f);
 
-        particle.AngularVelocity = _settings.AngularVelocity;
+        particle.AngularVelocity = Settings.AngularVelocity;
-        particle.AngularVelocity += 1f * _settings.AngularVelocityRandom * ((float)_random.NextDouble() - 0.5f);
+        particle.AngularVelocity += 1f * Settings.AngularVelocityRandom * ((float)_random.NextDouble() - 0.5f);
 
-        particle.LifeTime = _settings.LifeTime;
+        particle.LifeTime = Settings.LifeTime;
         particle.LifeTimeRemaining = particle.LifeTime;
 
         _particles[_particleIndex] = particle;
@@ -119,9 +195,11 @@ public class ParticleEmitter : IUpdatableSystem
 
     private Vector2 GetEmitPosition()
     {
+        var settings = _settingsResource.Value.Settings;
+
         // https://gamedev.stackexchange.com/questions/26713/calculate-random-points-pixel-within-a-circle-image
         var angle = _random.NextDouble() * Math.PI * 2;
-        float radius = (float)Math.Sqrt(_random.NextDouble()) * _settings.EmitRadius;
+        float radius = (float)Math.Sqrt(_random.NextDouble()) * settings.EmitRadius;
 
         float x = radius * (float)Math.Cos(angle);
         float y = radius * (float)Math.Sin(angle);
@@ -134,7 +212,7 @@ public class ParticleEmitter : IUpdatableSystem
     private int _particleIndex;
     private Vector2 _originPosition = Vector2.Zero;
     private ArraySegment<Particle> _particles;
-    private ParticleEmitterSettings _settings;
+    private ResourceRef<ParticleEmitterSettingsResource> _settingsResource;
 }
 
 public class ParticleSystem : IUpdatableSystem, IDisposable
@@ -152,12 +230,14 @@ public class ParticleSystem : IUpdatableSystem, IDisposable
         _particles = new Particle[ParticleLimit];
     }
 
-    public void CreateEmitter(Vector2 originPosition, ParticleEmitterSettings settings)
+    public int CreateEmitter(Vector2 originPosition, ResourceRef<ParticleEmitterSettingsResource> settingsResource)
     {
+        var settings = settingsResource.Value.Settings;
+
         if (_emitterSliceOffset + settings.MaxParticles >= ParticleLimit - 1)
         {
             _logger.Error("Cannot create an emitter! Reached particle limit.");
-            return;
+            return -1;
         }
 
         var particles = new ArraySegment<Particle>(_particles, _emitterSliceOffset, settings.MaxParticles);
@@ -173,11 +253,25 @@ public class ParticleSystem : IUpdatableSystem, IDisposable
             particle.LifeTime = settings.LifeTime;
         }
 
-        var emitter = new ParticleEmitter(originPosition, settings, particles);
+        var emitter = new ParticleEmitter(originPosition, settingsResource, particles);
 
         _emitters.Add(emitter);
-
         _emitterSliceOffset += settings.MaxParticles;
+
+        return _emitters.Count - 1;
+    }
+
+    public void RestartEmitter(int id)
+    {
+        if (id > _emitters.Count - 1)
+        {
+            throw new ArgumentException($"Emitter with id {id} doesn't exist!");
+        }
+
+        var emitter = _emitters[id];
+        var particles = new ArraySegment<Particle>(_particles, emitter.ParticleArrayOffset, emitter.Settings.MaxParticles);
+
+        emitter.Restart(particles);
     }
 
     public void Update(double deltaTime)
@@ -196,7 +290,6 @@ public class ParticleSystem : IUpdatableSystem, IDisposable
     private void CleanupParticles() => Array.Clear(_particles);
     private Particle[] _particles;
     private int _particleIndex;
-
     private int _emitterSliceOffset;
 
     private List<ParticleEmitter> _emitters = new();

Voile/Voile.csproj

@@ -12,6 +12,7 @@
         <PackageReference Include="Silk.NET.WebGPU" Version="2.20.0" />
         <PackageReference Include="Silk.NET.WebGPU.Native.WGPU" Version="2.20.0" />
         <PackageReference Include="Silk.NET.Windowing" Version="2.20.0" />
+        <PackageReference Include="Tommy" Version="3.1.2" />
         <PackageReference Include="Voile.Fmod" Version="0.2.2.8" />
         <PackageReference Include="ImGui.NET" Version="1.89.4" />
         <PackageReference Include="Raylib-cs" Version="4.2.0.1" />