Changed project name

Ghost.SparseEntities/Systems/SystemStorage.cs

@@ -0,0 +1,93 @@
+using System.Runtime.CompilerServices;
+using System.Runtime.InteropServices;
+
+namespace Ghost.SparseEntities.Systems;
+
+[SkipLocalsInit]
+public readonly struct SystemStorage
+{
+    private readonly List<Type> _systems = new();
+    private readonly List<ISystem> _executionList = new();
+
+    private readonly World _world;
+
+    internal ReadOnlySpan<Type> Systems => CollectionsMarshal.AsSpan(_systems);
+
+    internal SystemStorage(World world)
+    {
+        _world = world;
+    }
+
+    public readonly void AddSystem(Type systemType)
+    {
+        _systems.Add(systemType);
+    }
+
+    [MethodImpl(MethodImplOptions.AggressiveInlining)]
+    public readonly void AddSystem<T>()
+        where T : ISystem, new()
+    {
+        AddSystem(typeof(T));
+    }
+
+    public readonly void RemoveSystem(Type systemType)
+    {
+        _systems.Remove(systemType);
+    }
+
+    [MethodImpl(MethodImplOptions.AggressiveInlining)]
+    public readonly void RemoveSystem<T>()
+        where T : ISystem, new()
+    {
+        RemoveSystem(typeof(T));
+    }
+
+    internal void CreateSystems()
+    {
+        var builder = new SystemDependencyBuilder(_systems);
+        builder.BuildDependencyGraph();
+        var executionOrder = builder.BuildExecutionOrder();
+
+        var state = new SystemState()
+        {
+            World = _world,
+        };
+
+        foreach (var systemType in executionOrder)
+        {
+            var system = (ISystem?)Activator.CreateInstance(systemType) ?? throw new InvalidOperationException($"Failed to create instance of system type {systemType.Name}.");
+
+            _executionList.Add(system);
+            system.OnCreate(in state);
+        }
+    }
+
+    internal void UpdateSystems()
+    {
+        var state = new SystemState()
+        {
+            World = _world,
+        };
+
+        foreach (var system in _executionList)
+        {
+            system.OnUpdate(in state);
+        }
+    }
+
+    internal void Dispose()
+    {
+        var state = new SystemState()
+        {
+            World = _world,
+        };
+
+        foreach (var system in _executionList)
+        {
+            system.OnDestroy(in state);
+        }
+
+        _systems.Clear();
+        _executionList.Clear();
+    }
+}