Ghost.Core/Ghost.Core.csproj

@@ -20,8 +20,9 @@
   </PropertyGroup>
 
   <ItemGroup>
-    <PackageReference Include="Misaki.HighPerformance" Version="1.0.1" />
-    <PackageReference Include="Misaki.HighPerformance.LowLevel" Version="1.2.5" />
+    <PackageReference Include="Misaki.HighPerformance" Version="1.0.2" />
+    <PackageReference Include="Misaki.HighPerformance.Jobs" Version="1.2.1" />
+    <PackageReference Include="Misaki.HighPerformance.LowLevel" Version="1.3.2" />
     <PackageReference Include="Misaki.HighPerformance.Mathematics" Version="1.2.6" />
     <PackageReference Include="System.IO.Hashing" Version="10.0.0" />
     <PackageReference Include="TerraFX.Interop.Windows" Version="10.0.26100.5" />

Ghost.Core/Handle.cs

@@ -4,8 +4,7 @@ public interface IHandleType;
 public interface IIdentifierType;
 public interface IKeyType;
 
-public readonly struct Handle<T>
-    where T : IHandleType
+public readonly struct Handle<T> : IEquatable<Handle<T>>
 {
     public readonly int id;
     public readonly int generation;
@@ -57,8 +56,7 @@ public readonly struct Handle<T>
     }
 }
 
-public readonly struct Identifier<T>
-    where T : IIdentifierType
+public readonly struct Identifier<T> : IEquatable<Identifier<T>>
 {
     public readonly int value;
 
@@ -74,7 +72,7 @@ public readonly struct Identifier<T>
 
     public readonly override int GetHashCode()
     {
-        return value.GetHashCode();
+        return value;
     }
 
     public readonly override bool Equals(object? obj)
@@ -106,10 +104,32 @@ public readonly struct Identifier<T>
     {
         return !a.Equals(b);
     }
+
+    public static bool operator <(Identifier<T> a, Identifier<T> b)
+    {
+        return a.value < b.value;
+    }
+
+    public static bool operator >(Identifier<T> a, Identifier<T> b)
+    {
+        return a.value > b.value;
+    }
+
+    public static bool operator <=(Identifier<T> a, Identifier<T> b)
+    {
+        return a.value <= b.value;
+    }
+
+    public static bool operator >=(Identifier<T> a, Identifier<T> b)
+    {
+        return a.value >= b.value;
+    }
+
+    public static implicit operator int(Identifier<T> id) => id.value;
+    public static implicit operator Identifier<T>(int value) => new Identifier<T>(value);
 }
 
 public readonly struct Key<T>
-    where T : IKeyType
 {
     public readonly ulong value;
 

Ghost.Core/Result.cs

@@ -1,14 +1,16 @@
+using Misaki.HighPerformance.LowLevel;
+using System.Runtime.CompilerServices;
+
 namespace Ghost.Core;
 
 public readonly struct Result
 {
-    private readonly bool _isSuccess;
     private readonly string? _message;
-
-    public readonly bool IsSuccess => _isSuccess;
-    public readonly bool IsFailure => !_isSuccess;
+    private readonly bool _isSuccess;
 
     public readonly string? Message => _message;
+    public readonly bool IsSuccess => _isSuccess;
+    public readonly bool IsFailure => !_isSuccess;
 
     public Result(bool success, string? message = null)
     {
@@ -36,16 +38,10 @@ public readonly struct Result
         return Result<T>.Failure(message);
     }
 
-    public static Result<T, S> Create<T, S>(T value, S status)
-        where S : Enum
+    public void Deconstruct(out bool success, out string? message)
     {
-        return new Result<T, S>(value, status);
-    }
-
-    public static RefResult<T, S> CreateRef<T, S>(ref T value, S status)
-        where S : Enum
-    {
-        return new RefResult<T, S>(ref value, status);
+        success = IsSuccess;
+        message = Message;
     }
 
     public override string ToString() => IsSuccess ? "OK" : $"Error: {Message}";
@@ -55,16 +51,28 @@ public readonly struct Result
 
 public readonly struct Result<T>
 {
-    private readonly bool _isSuccess;
     private readonly T _value;
     private readonly string? _message;
+    private readonly bool _isSuccess;
 
+    public T Value
+    {
+        get
+        {
+#if DEBUG || GHOST_EDITOR
+            if (!_isSuccess)
+            {
+                throw new InvalidOperationException($"Cannot access Value when Result is a failure. {_message}");
+            }
+#endif
+            return _value;
+        }
+    }
+
+    public readonly string? Message => _message;
     public readonly bool IsSuccess => _isSuccess;
     public readonly bool IsFailure => !_isSuccess;
 
-    public readonly T Value => _value;
-    public readonly string? Message => _message;
-
     public Result(bool success, T value, string? message = null)
     {
         _isSuccess = success;
@@ -82,6 +90,13 @@ public readonly struct Result<T>
         return new Result<T>(false, default!, message);
     }
 
+    public void Deconstruct(out bool success, out T value, out string? message)
+    {
+        success = IsSuccess;
+        value = Value;
+        message = Message;
+    }
+
     public override string ToString() => IsSuccess ? $"OK: {Value}" : $"Error: {Message}";
 
     public static implicit operator Result<T>(T? data) => data is not null ? Success(data) : Failure(null);
@@ -89,9 +104,9 @@ public readonly struct Result<T>
     public static implicit operator bool(Result<T> result) => result.IsSuccess;
 }
 
-public enum ResultStatus : byte
+public enum ErrorStatus : byte
 {
-    Success,
+    None,
     NotFound,
     InvalidArgument,
     InvalidState,
@@ -104,67 +119,152 @@ public enum ResultStatus : byte
     UnknownError
 }
 
-public readonly struct Result<T, S>
-    where S : Enum
+public readonly struct Result<T, E>
+    where E : struct, Enum
 {
     private readonly T _value;
-    private readonly S _status;
+    private readonly E _error;
+    private readonly bool _isSuccess;
 
-    public T Value => _value;
-    public S Status => _status;
+    public T Value
+    {
+        get
+        {
+#if DEBUG || GHOST_EDITOR
+            if (!_isSuccess)
+            {
+                throw new InvalidOperationException($"Cannot access Value when Result is a failure. Error: {_error}");
+            }
+#endif
+            return _value;
+        }
+    }
 
-    public Result(T value, S status)
+    public E Error => _error;
+    public bool IsSuccess => _isSuccess;
+    public bool IsFailure => !_isSuccess;
+
+    public Result(T value, E status, bool isSuccess)
     {
         _value = value;
-        _status = status;
+        _error = status;
+        _isSuccess = isSuccess;
     }
 
-    public static Result<T, S> Create(T value, S status)
+    public static Result<T, E> Success(T value)
     {
-        return new Result<T, S>(value, status);
+        return new Result<T, E>(value, default, true);
     }
 
-    public override string ToString() => $"Value: {_value}, Status: {_status}";
+    public static Result<T, E> Failure(E status)
+    {
+        return new Result<T, E>(default!, status, false);
+    }
+
+    public void Deconstruct(out bool success, out T value, out E status)
+    {
+        success = IsSuccess;
+        value = Value;
+        status = Error;
+    }
+
+    public override string ToString() => $"Value: {_value}, Status: {_error}";
+
+    public static implicit operator Result<T, E>(T data) => new(data, default, true);
+    public static implicit operator Result<T, E>(E status) => new(default!, status, false);
+    public static implicit operator bool(Result<T, E> result) => result.IsSuccess;
 }
 
-public readonly ref struct RefResult<T, S>
-    where S : Enum
+public readonly ref struct RefResult<T, E>
+    where E : struct, Enum
 {
     private readonly ref T _value;
-    private readonly S _status;
+    private readonly E _error;
+    private readonly bool _isSuccess;
 
-    public ref T Value => ref _value;
-    public S Status => _status;
+    public ref T Value
+    {
+        get
+        {
+#if DEBUG || GHOST_EDITOR
+            if (!_isSuccess)
+            {
+                throw new InvalidOperationException($"Cannot access Value when Result is a failure. Error: {_error}");
+            }
+#endif
+            return ref _value;
+        }
+    }
 
-    public RefResult(ref T value, S status)
+    public E Error => _error;
+    public bool IsSuccess => _isSuccess;
+    public bool IsFailure => !_isSuccess;
+
+    public RefResult(ref T value, E error, bool isSuccess)
     {
         _value = ref value;
-        _status = status;
+        _error = error;
+        _isSuccess = isSuccess;
     }
 
-    public static RefResult<T, S> Create(ref T value, S status)
+    public static RefResult<T, E> Success(ref T value)
     {
-        return new RefResult<T, S>(ref value, status);
+        return new RefResult<T, E>(ref value, default, true);
     }
 
-    public override string ToString() => $"Value: {_value}, Status: {_status}";
+    public static RefResult<T, E> Failure(E error)
+    {
+        return new RefResult<T, E>(ref Unsafe.NullRef<T>(), error, false);
+    }
+
+    public void Deconstruct(out bool success, out Ref<T> value, out E status)
+    {
+        success = IsSuccess;
+        value = new Ref<T>(ref Value);
+        status = Error;
+    }
+
+    public override string ToString() => $"Value: {_value}, Status: {_error}";
+
+    public static implicit operator RefResult<T, E>(Ref<T> data) => new(ref data.Get(), default, true);
+    public static implicit operator RefResult<T, E>(E error) => new(ref Unsafe.NullRef<T>(), error, false);
+    public static implicit operator bool(RefResult<T, E> result) => result.IsSuccess;
 }
 
 public static class ResultExtensions
 {
-    public static void ThrowIfFailed(this Result result)
+    public static void ThrowIfFailed(this ErrorStatus result, [CallerArgumentExpression(nameof(result))] string? op = null)
     {
-        if (!result.IsSuccess)
+        if (result != ErrorStatus.None)
         {
-            throw new InvalidOperationException($"Operation failed: {result.Message}");
+            throw new InvalidOperationException($"{op} failed: {result}");
         }
     }
 
-    public static T GetValueOrThrow<T>(this Result<T> result)
+    public static void ThrowIfFailed(this Result result, [CallerArgumentExpression(nameof(result))] string? op = null)
     {
         if (!result.IsSuccess)
         {
-            throw new InvalidOperationException($"Operation failed: {result.Message}");
+            throw new InvalidOperationException($"{op} failed: {result.Message}");
+        }
+    }
+
+    public static T GetValueOrThrow<T>(this Result<T> result, [CallerArgumentExpression(nameof(result))] string? op = null)
+    {
+        if (!result.IsSuccess)
+        {
+            throw new InvalidOperationException($"{op} failed: {result.Message}");
+        }
+
+        return result.Value;
+    }
+
+    public static T GetValueOrThrow<T, S>(this Result<T, S> result, [CallerArgumentExpression(nameof(result))] string? op = null)
+        where S : struct, Enum
+    {
+        if (!result.IsSuccess)
+        {
+            throw new InvalidOperationException($"{op} failed: status {result.Error}");
         }
 
         return result.Value;
@@ -175,21 +275,35 @@ public static class ResultExtensions
         return result.IsSuccess ? result.Value : defaultValue;
     }
 
-    public static T GetValueOrThrow<T, S>(this Result<T, S> result, S expect)
-        where S : Enum
+    public static T? GetValueOrDefault<T, S>(this Result<T, S> result, T? defaultValue = default)
+        where S : struct, Enum
     {
-        if (!EqualityComparer<S>.Default.Equals(result.Status, expect))
-        {
-            throw new InvalidOperationException($"Operation failed: expected status {expect}, but got {result.Status}");
-        }
-
-        return result.Value;
+        return result.IsSuccess ? result.Value : defaultValue;
     }
 
-    public static T? GetValueOrDefault<T, S>(this Result<T, S> result, S expect, T? defaultValue = default)
-        where S : Enum
+    public static bool TryGetValue<T>(this Result<T> result, out T value)
     {
-        return (result.Status?.Equals(expect) ?? false) ? defaultValue : result.Value;
+        if (result.IsSuccess)
+        {
+            value = result.Value;
+            return true;
+        }
+
+        value = default!;
+        return false;
+    }
+
+    public static bool TryGetValue<T, S>(this Result<T, S> result, out T value)
+        where S : struct, Enum
+    {
+        if (result.IsSuccess)
+        {
+            value = result.Value;
+            return true;
+        }
+
+        value = default!;
+        return false;
     }
 
     public static Result OnSuccess(this Result result, Action action)
@@ -212,6 +326,17 @@ public static class ResultExtensions
         return result;
     }
 
+    public static Result<T, E> OnSuccess<T, E>(this Result<T, E> result, Action<T> action)
+        where E : struct, Enum
+    {
+        if (result.IsSuccess)
+        {
+            action(result.Value);
+        }
+
+        return result;
+    }
+
     public static Result OnFailed(this Result result, Action<string?> action)
     {
         if (result.IsFailure)
@@ -231,4 +356,15 @@ public static class ResultExtensions
 
         return result;
     }
+
+    public static Result<T, E> OnFailed<T, E>(this Result<T, E> result, Action<E> action)
+        where E : struct, Enum
+    {
+        if (result.IsFailure)
+        {
+            action(result.Error);
+        }
+
+        return result;
+    }
 }

Ghost.Editor.Core/Controls/Internal/ComponentDataView.cs

@@ -2,7 +2,7 @@ using Ghost.Core;
 using Ghost.Editor.Core.Inspector;
 using Ghost.Editor.Core.Resources;
 using Ghost.Editor.Core.Utilities;
-using Ghost.Entities;
+using Ghost.SparseEntities;
 using Microsoft.UI.Xaml;
 using Microsoft.UI.Xaml.Controls;
 using System.Reflection;

Ghost.Editor.Core/Inspector/ComponentObject.cs

@@ -1,6 +1,6 @@
-using Ghost.Entities;
-using Ghost.Entities.Components;
-using Ghost.Entities.Query;
+using Ghost.SparseEntities;
+using Ghost.SparseEntities.Components;
+using Ghost.SparseEntities.Query;
 
 namespace Ghost.Editor.Core.Inspector;
 

Ghost.Editor.Core/SceneGraph/EntityNode.cs

@@ -2,7 +2,7 @@ using Ghost.Editor.Core.Controls.Internal;
 using Ghost.Editor.Core.Inspector;
 using Ghost.Editor.Core.Resources;
 using Ghost.Engine.Editor;
-using Ghost.Entities;
+using Ghost.SparseEntities;
 using Microsoft.UI.Text;
 using Microsoft.UI.Xaml;
 using Microsoft.UI.Xaml.Controls;

Ghost.Editor.Core/SceneGraph/SceneGraphHelpers.cs

@@ -1,5 +1,5 @@
 using Ghost.Engine.Components;
-using Ghost.Entities;
+using Ghost.SparseEntities;
 
 namespace Ghost.Editor.Core.SceneGraph;
 

Ghost.Editor.Core/SceneGraph/WorldNode.cs

@@ -3,7 +3,7 @@ using Ghost.Editor.Core.Inspector;
 using Ghost.Editor.Core.Resources;
 using Ghost.Editor.Core.Serializer;
 using Ghost.Engine.Components;
-using Ghost.Entities;
+using Ghost.SparseEntities;
 using Microsoft.UI.Xaml;
 using Microsoft.UI.Xaml.Controls;
 using System.Text.Json.Serialization;

Ghost.Editor.Core/Serializer/WorldNodeSerializer.cs

@@ -1,7 +1,7 @@
 using Ghost.Editor.Core.SceneGraph;
 using Ghost.Engine.Utilities;
-using Ghost.Entities;
-using Ghost.Entities.Components;
+using Ghost.SparseEntities;
+using Ghost.SparseEntities.Components;
 using System.Text.Json;
 using System.Text.Json.Serialization;
 

Ghost.Engine/Components/Hierarchy.cs

@@ -1,6 +1,6 @@
 using Ghost.Engine.Editor;
-using Ghost.Entities;
-using Ghost.Entities.Components;
+using Ghost.SparseEntities;
+using Ghost.SparseEntities.Components;
 using System.Runtime.CompilerServices;
 
 namespace Ghost.Engine.Components;

Ghost.Engine/Components/LocalToWorld.cs

@@ -1,5 +1,5 @@
 using Ghost.Engine.Utilities;
-using Ghost.Entities.Components;
+using Ghost.SparseEntities.Components;
 using System.Numerics;
 using System.Runtime.CompilerServices;
 

Ghost.Engine/Ghost.Engine.csproj

@@ -16,7 +16,7 @@
   </PropertyGroup>
 
   <ItemGroup>
-    <ProjectReference Include="..\Ghost.Entities\Ghost.Entities.csproj" />
+    <ProjectReference Include="..\Ghost.SparseEntities\Ghost.SparseEntities.csproj" />
     <ProjectReference Include="..\Ghost.Graphics\Ghost.Graphics.csproj" />
     <!--<ProjectReference Include="..\Ghost.Generator\Ghost.Generator.csproj" OutputItemType="Analyzer" ReferenceOutputAssembly="false" />-->
   </ItemGroup>

Ghost.Engine/Services/PlayerLoopService.cs

@@ -1,4 +1,4 @@
-using Ghost.Entities;
+using Ghost.SparseEntities;
 
 namespace Ghost.Engine.Services;
 

Ghost.Entities.Test/EntityQueryTest.cs

@@ -0,0 +1,101 @@
+using Ghost.Test.Core;
+using Misaki.HighPerformance.Jobs;
+using Misaki.HighPerformance.Mathematics;
+
+namespace Ghost.Entities.Test;
+
+internal struct TestEntityQueryJob : IJobEntity<Transform>
+{
+    public readonly void Execute(Entity entity, ref Transform transform, int threadIndex)
+    {
+        transform.position += new float3(5, 5, 5);
+    }
+}
+
+internal struct TestChunkQueryJob : IJobChunk
+{
+    public readonly void Execute(ChunkView view, int threadIndex)
+    {
+        var random = new random((uint)threadIndex + 1u);
+
+        var transforms = view.GetComponentDataRW<Transform>();
+        for (var i = 0; i < view.Count; i++)
+        {
+            transforms[i].position += random.NextFloat3();
+        }
+    }
+}
+
+public partial class EntityQueryTest : ITest
+{
+    private JobScheduler _jobScheduler = null!;
+    private World _world = null!;
+
+    public void Setup()
+    {
+        _jobScheduler = new JobScheduler(4);
+        _world = World.Create(_jobScheduler);
+    }
+
+    public void Run()
+    {
+        var entities = (Span<Entity>)stackalloc Entity[1000];
+        _world.EntityManager.CreateEntities(entities, ComponentTypeID<Transform>.value);
+
+        var queryID = new QueryBuilder().WithAllRW<Transform>().Build(_world);
+        ref var query = ref _world.GetEntityQueryReference(queryID);
+
+        _world.AdvanceVersion();
+
+        var testJob = new TestChunkQueryJob();
+        var handle = query.ScheduleChunkParallel(testJob, 64, JobHandle.Invalid);
+        _jobScheduler.WaitComplete(handle);
+
+        query.ForEach<Transform>((e, ref t) =>
+        {
+            Console.WriteLine($"Entity {e} Has Position: {t.position}");
+        });
+
+        foreach (var (entity, transform) in query.GetEntityComponentIterator<Transform>())
+        {
+            Console.WriteLine($"Entity {entity} Updated Position: {transform.Get().position}");
+        }
+
+        foreach (var chunk in query.GetChunkIterator())
+        {
+            var transforms = chunk.GetComponentData<Transform>();
+            var chunkEntities = chunk.GetEntities();
+
+            // if (chunk.HasChanged<Transform>(0))
+            {
+                // var bits = chunk.GetEnableBits<Transform>();
+
+                // var it = bits.GetIterator();
+                // while (it.Next(out var index) && index < chunk.Count)
+                for (var index = 0; index < chunk.Count; index++)
+                {
+                    Console.WriteLine($"Entity {chunkEntities[index]} Updated Position: {transforms[index].position}");
+                }
+            }
+        }
+
+        _world.EntityManager.DestroyEntities(entities);
+    }
+
+    public void Cleanup()
+    {
+        _world.Dispose();
+        _jobScheduler.Dispose();
+        JobScheduler.ReleaseTempAllocator();
+    }
+}
+
+public struct Transform : IEnableableComponent
+{
+    public float3 position;
+}
+
+public struct Mesh : IComponent
+{
+    public int index;
+}

Ghost.Entities.Test/EntityTest.cs

@@ -1,191 +0,0 @@
-using Ghost.Entities.Components;
-using Ghost.Entities.Query;
-using Ghost.Entities.Systems;
-using Ghost.Test.Core;
-using System.Numerics;
-
-namespace Ghost.Entities.Test;
-
-public partial class EntityTest : ITest
-{
-    private World _world = null!;
-
-    public void Setup()
-    {
-        _world = World.Create();
-    }
-
-    public void Run()
-    {
-        var entity1 = _world.EntityManager.CreateEntity();
-        var entity2 = _world.EntityManager.CreateEntity();
-        var entity3 = _world.EntityManager.CreateEntity();
-
-        _world.EntityManager.AddComponent(entity1, new Transform { position = new Vector3(1, 2, 3) });
-        _world.EntityManager.AddComponent(entity1, new Mesh { index = 42 });
-        _world.EntityManager.AddScript<UIManager>(entity1);
-        _world.EntityManager.AddScript<EventManager>(entity1);
-
-        _world.EntityManager.AddComponent(entity2, new Transform { position = new Vector3(4, 5, 6) });
-        _world.EntityManager.AddComponent(entity2, new Mesh { index = 43 });
-        _world.EntityManager.AddScript<UserScript>(entity2);
-
-        _world.EntityManager.AddComponent(entity3, new Transform { position = new Vector3(7, 8, 9) });
-        _world.EntityManager.AddScript<EventManager>(entity3);
-
-        foreach (var (_, transform) in _world.Query<Transform>())
-        {
-            transform.ValueRW.position += new Vector3(1, 1, 1);
-        }
-
-        var filter = new QueryBuilder()
-            .WithAll<Mesh>()
-            .Build();
-
-        foreach (var (_, mesh) in _world.QueryFilter<Mesh>(in filter))
-        {
-            mesh.ValueRW.index += 1;
-        }
-
-        _world.EntityManager.RemoveEntity(ref entity2);
-
-        var entity4 = _world.EntityManager.CreateEntity();
-        _world.EntityManager.AddComponent(entity4, new Transform { position = new Vector3(10, 11, 12) });
-        _world.EntityManager.AddComponent(entity4, new Mesh { index = 45 });
-        _world.EntityManager.AddScript<UserScript>(entity4);
-
-        _world.SystemStorage.AddSystem<TestSystem2>();
-        _world.SystemStorage.AddSystem<TestSystem>();
-
-        _world.SystemStorage.CreateSystems();
-        _world.SystemStorage.UpdateSystems();
-    }
-
-    public void Cleanup()
-    {
-        _world.Dispose();
-    }
-}
-
-public class TestSystem : ISystem
-{
-    public void OnCreate(in SystemState state)
-    {
-    }
-
-    public void OnUpdate(in SystemState state)
-    {
-        foreach (var (entity, transform) in state.World.Query<Transform>())
-        {
-            Console.WriteLine($"Entity {entity}: Transform Position = {transform.ValueRO.position}");
-        }
-    }
-
-    public void OnDestroy(in SystemState state)
-    {
-    }
-}
-
-[DependsOn(typeof(TestSystem))]
-public class TestSystem2 : ISystem
-{
-    public void OnCreate(in SystemState state)
-    {
-    }
-
-    public void OnUpdate(in SystemState state)
-    {
-        foreach (var (entity, mesh) in state.World.Query<Mesh>())
-        {
-            Console.WriteLine($"Entity {entity}: Mesh Index = {mesh.ValueRO.index}");
-        }
-    }
-
-    public void OnDestroy(in SystemState state)
-    {
-    }
-}
-
-public struct Transform : IComponentData
-{
-    public Vector3 position;
-    public Quaternion rotation;
-    public Vector3 scale;
-}
-
-public struct Mesh : IComponentData
-{
-    public uint index;
-}
-
-public class UserScript : ScriptComponent
-{
-    public override int ExecutionOrder => -1;
-
-    public override void OnEnable()
-    {
-        Console.WriteLine("UserScript enabled for entity: " + Owner);
-        EntityManager.GetComponent<Transform>(Owner).ValueRW.position += new Vector3(10, 10, 10);
-    }
-
-    override public void OnDisable()
-    {
-        Console.WriteLine("UserScript disabled for entity: " + Owner);
-    }
-
-    public override void Initialize()
-    {
-        Console.WriteLine("UserScript initialized for entity: " + Owner);
-    }
-
-    public override void Start()
-    {
-        Console.WriteLine("UserScript started for entity: " + Owner);
-    }
-
-    public override void Update()
-    {
-        Console.WriteLine("UserScript updating for entity: " + Owner);
-    }
-
-    public override void OnDestroy()
-    {
-        Console.WriteLine("UserScript destroyed for entity: " + Owner);
-    }
-}
-
-public class UIManager : ScriptComponent
-{
-    public override void Start()
-    {
-        Console.WriteLine("UIManager started for entity: " + Owner);
-    }
-
-    public override void Update()
-    {
-        Console.WriteLine("UIManager updating for entity: " + Owner);
-    }
-
-    public override void OnDestroy()
-    {
-        Console.WriteLine("UIManager destroyed for entity: " + Owner);
-    }
-}
-
-public class EventManager : ScriptComponent
-{
-    public override void Start()
-    {
-        Console.WriteLine("EventManager started for entity: " + Owner);
-    }
-
-    public override void Update()
-    {
-        Console.WriteLine("EventManager updating for entity: " + Owner);
-    }
-
-    public override void OnDestroy()
-    {
-        Console.WriteLine("EventManager destroyed for entity: " + Owner);
-    }
-}

Ghost.Entities.Test/Program.cs

@@ -1,5 +1,7 @@
-
 using Ghost.Entities.Test;
 using Ghost.Test.Core;
+using Misaki.HighPerformance.LowLevel.Buffer;
 
-TestRunner.Run<EntityTest>();
+AllocationManager.EnableDebugLayer();
+TestRunner.Run<SystemTest>();
+AllocationManager.Dispose();

Ghost.Entities.Test/SystemTest.cs

@@ -0,0 +1,52 @@
+using Ghost.Test.Core;
+using Misaki.HighPerformance.Jobs;
+
+namespace Ghost.Entities.Test;
+
+internal class SystemTest : ITest
+{
+    private JobScheduler _jobScheduler = null!;
+    private World _world = null!;
+
+    public void Setup()
+    {
+        _jobScheduler = new JobScheduler(4);
+        _world = World.Create(_jobScheduler);
+    }
+
+    public void Run()
+    {
+        var group = _world.SystemManager.GetSystem<DefaultSystemGroup>();
+        group.AddSystem<TestSystemB>();
+        group.AddSystem<TestSystemA>();
+
+        group.SortSystems();
+
+        var api = new SystemAPI();
+        _world.SystemManager.InitializeAll(in api);
+    }
+
+    public void Cleanup()
+    {
+        _world.Dispose();
+        _jobScheduler.Dispose();
+        JobScheduler.ReleaseTempAllocator();
+    }
+}
+
+internal class TestSystemA : SystemBase
+{
+    protected override void OnInitialize(ref readonly SystemAPI systemAPI)
+    {
+        Console.WriteLine("TestSystemA Initialized");
+    }
+}
+
+[UpdateAfter(typeof(TestSystemA))]
+internal class TestSystemB : SystemBase
+{
+    protected override void OnInitialize(ref readonly SystemAPI systemAPI)
+    {
+        Console.WriteLine("TestSystemB Initialized");
+    }
+}

Ghost.Entities/Archetype.cs

@@ -0,0 +1,702 @@
+using Ghost.Core;
+using Misaki.HighPerformance.LowLevel.Buffer;
+using Misaki.HighPerformance.LowLevel.Collections;
+using Misaki.HighPerformance.LowLevel.Utilities;
+using System.Diagnostics;
+using System.Runtime.CompilerServices;
+
+namespace Ghost.Entities;
+
+internal unsafe sealed class ChunkDebugView
+{
+    [DebuggerDisplay("{Name,nq}: {Data}")]
+    internal class ComponentArrayView
+    {
+        public string Name { get; }
+        [DebuggerBrowsable(DebuggerBrowsableState.RootHidden)]
+        public object Data { get; }
+
+        public ComponentArrayView(string name, object data)
+        {
+            Name = name;
+            Data = data;
+        }
+    }
+
+    private Chunk _chunk;
+
+    public ChunkDebugView(Chunk chunk)
+    {
+        _chunk = chunk;
+    }
+
+    [DebuggerBrowsable(DebuggerBrowsableState.RootHidden)]
+    public object[] Items => GetItems(in _chunk);
+
+    private static T[] ReadComponentArray<T>(long pData, int offsetInChunk, int count)
+        where T : unmanaged
+    {
+        var result = new T[count];
+        unsafe
+        {
+            var basePtr = (byte*)pData + offsetInChunk;
+            var span = new Span<T>(basePtr, count);
+            span.CopyTo(result);
+        }
+
+        return result;
+    }
+
+    private static object[] GetItems(ref readonly Chunk chunk)
+    {
+#if !(DEBUG || GHOST_EDITOR)
+        return [];
+#else
+        var pData = chunk.GetUnsafePtr();
+        var count = chunk._count;
+        var capacity = chunk._capacity;
+        var worldID = chunk._worldID;
+        var archetypeID = chunk._archetypeID;
+
+        if (count == 0)
+        {
+            return [];
+        }
+
+        var views = new List<object>();
+        var r = World.GetWorld(worldID);
+        if (!r)
+        {
+            return [];
+        }
+
+        ref var archetype = ref r.Value.GetArchetypeReference(archetypeID);
+        var it = archetype._signature.GetIterator();
+        while (it.Next(out var index))
+        {
+            var type = ComponentRegister.s_runtimeIDToType[index];
+            if (type == null)
+            {
+                continue;
+            }
+            var layout = archetype.GetLayout(index).Value;
+            var readMethod = typeof(ChunkDebugView)
+                .GetMethod(nameof(ReadComponentArray), System.Reflection.BindingFlags.NonPublic | System.Reflection.BindingFlags.Static)!
+                .MakeGenericMethod(type);
+
+            // 3. Invoke it to get a Position[] or Velocity[]
+            var array = readMethod.Invoke(null, [(long)pData, layout.offset, count]);
+            if (array == null)
+            {
+                continue;
+            }
+
+            // 4. Wrap it in a nice label so the debugger shows "Position[]"
+            views.Add(new ComponentArrayView(type.Name, array));
+        }
+
+        return [.. views];
+#endif
+    }
+}
+
+[DebuggerTypeProxy(typeof(ChunkDebugView))]
+internal unsafe struct Chunk : IDisposable
+{
+    public const int CHUNK_BUFFER_SIZE = 16384; // 16 KB
+    public const int BIT_ALIGNMENT = 8;
+    public const int BIT_SHIFT = 3; // log2(BIT_ALIGNMENT)
+    public const int BIT_ALIGNMENT_MINUS_ONE = BIT_ALIGNMENT - 1;
+
+    private UnsafeArray<byte> _data;
+    private UnsafeArray<int> _versions;
+
+    // TODO: Add structual change versioning, similar to DidOrderChange in unity ecs.
+    internal int _structuralVersion;
+
+    internal int _count;
+    internal readonly int _capacity;
+
+#if DEBUG || GHOST_EDITOR
+    // For debugging purpose
+    internal int _worldID;
+    internal int _archetypeID;
+#endif
+
+    public Chunk(int bufferSize, int capacity, int componentCount, int globalVersion)
+    {
+        _data = new UnsafeArray<byte>(bufferSize, Allocator.Persistent, AllocationOption.Clear);
+        _versions = new UnsafeArray<int>(componentCount, Allocator.Persistent);
+        _capacity = capacity;
+        _count = 0;
+
+        _versions.AsSpan().Fill(globalVersion);
+        _structuralVersion = globalVersion;
+    }
+
+    [MethodImpl(MethodImplOptions.AggressiveInlining)]
+    public readonly byte* GetUnsafePtr()
+    {
+        return (byte*)_data.GetUnsafePtr();
+    }
+
+    [MethodImpl(MethodImplOptions.AggressiveInlining)]
+    public readonly int* GetVersionUnsafePtr()
+    {
+        return (int*)_versions.GetUnsafePtr();
+    }
+
+    public void Dispose()
+    {
+        _data.Dispose();
+        _versions.Dispose();
+    }
+}
+
+internal unsafe struct Archetype : IDisposable
+{
+    internal struct ComponentMemoryLayout
+    {
+        public int componentID;
+        public int size;
+        public int offset;
+        public int enableBitsOffset;
+        public int versionIndex;
+    }
+
+    private struct Edge
+    {
+        public int componentID;
+        public int targetArchetype; // can't use Identifier<Archetype> because cycle causer
+    }
+
+    internal UnsafeBitSet _signature;
+    internal UnsafeList<Chunk> _chunks;
+    internal UnsafeArray<ComponentMemoryLayout> _layouts;
+
+    private UnsafeArray<int> _componentIDToLayoutIndex;
+    // TODO: Is hash map better?
+    private UnsafeList<Edge> _edgesAdd;
+    private UnsafeList<Edge> _edgesRemove;
+
+    private readonly Identifier<Archetype> _id;
+    private readonly Identifier<World> _worldID;
+
+    private readonly int _hash;
+    private int _entityCapacity;
+    private int _maxComponentID;
+    private int _entityIdsOffset;
+
+    public readonly Identifier<Archetype> ID => _id;
+    public readonly Identifier<World> WorldID => _worldID;
+
+    public readonly int EntityCapacity => _entityCapacity;
+    public readonly int ChunkCount => _chunks.Count;
+    public readonly int EntityIDsOffset => _entityIdsOffset;
+
+    public Archetype(Identifier<Archetype> id, Identifier<World> worldID, ReadOnlySpan<Identifier<IComponent>> componentIds)
+    {
+        _id = id;
+        _worldID = worldID;
+
+        _chunks = new UnsafeList<Chunk>(4, Allocator.Persistent);
+        _edgesAdd = new UnsafeList<Edge>(4, Allocator.Persistent);
+        _edgesRemove = new UnsafeList<Edge>(4, Allocator.Persistent);
+
+        if (componentIds.IsEmpty)
+        {
+            _signature = new UnsafeBitSet(1, Allocator.Persistent, AllocationOption.Clear);
+            _hash = 0;
+
+            _signature.ClearAll();
+            _entityCapacity = Chunk.CHUNK_BUFFER_SIZE / sizeof(Entity);
+
+            return;
+        }
+
+        var highestComponentID = 0;
+        for (var i = 0; i < componentIds.Length; i++)
+        {
+            if (componentIds[i] > highestComponentID)
+            {
+                highestComponentID = componentIds[i];
+            }
+        }
+
+        _signature = new UnsafeBitSet(highestComponentID + 1, Allocator.Persistent, AllocationOption.Clear);
+        _hash = _signature.GetHashCode();
+
+        CalculateLayout(componentIds);
+    }
+
+    private void CalculateLayout(ReadOnlySpan<Identifier<IComponent>> componentIds)
+    {
+        var entitySize = sizeof(Entity);
+        var entityAlign = (int)MemoryUtility.AlignOf<Entity>();
+
+        var components = (Span<ComponentInfo>)stackalloc ComponentInfo[componentIds.Length];
+        for (var i = 0; i < componentIds.Length; i++)
+        {
+            _signature.SetBit(componentIds[i]);
+            components[i] = ComponentRegister.GetComponentInfo(componentIds[i]);
+        }
+
+        // Calculate total size per entity to get an initial capacity estimate
+        var bytesPerEntity = entitySize;
+        var maxComponentID = 0;
+        for (var i = 0; i < components.Length; i++)
+        {
+            var comp = components[i];
+            bytesPerEntity += comp.size;
+            if (comp.id > maxComponentID)
+            {
+                maxComponentID = comp.id;
+            }
+        }
+
+        _maxComponentID = maxComponentID;
+        _entityCapacity = Chunk.CHUNK_BUFFER_SIZE / bytesPerEntity;
+        _layouts = new UnsafeArray<ComponentMemoryLayout>(components.Length, Allocator.Persistent);
+        _componentIDToLayoutIndex = new UnsafeArray<int>(_maxComponentID + 1, Allocator.Persistent);
+
+        _componentIDToLayoutIndex.AsSpan().Fill(-1);
+
+        components.Sort((a, b) => b.alignment.CompareTo(a.alignment));
+        var tempOffsets = stackalloc int[components.Length];
+        var tempBitmaskOffsets = stackalloc int[components.Length];
+
+        while (_entityCapacity > 0)
+        {
+            var currentOffset = 0;
+            var fits = true;
+
+            currentOffset = (currentOffset + entityAlign - 1) & ~(entityAlign - 1);
+
+            _entityIdsOffset = currentOffset;
+            currentOffset += _entityCapacity * entitySize;
+
+            for (var i = 0; i < components.Length; i++)
+            {
+                var size = components[i].size;
+                var align = components[i].alignment;
+
+                currentOffset = (currentOffset + align - 1) & ~(align - 1);
+                tempOffsets[i] = currentOffset;
+                currentOffset += _entityCapacity * size;
+
+                var bitmaskOffset = -1;
+                if (components[i].isEnableable)
+                {
+                    var bitmaskSize = (_entityCapacity + Chunk.BIT_ALIGNMENT_MINUS_ONE) / Chunk.BIT_ALIGNMENT;
+                    // Reserve space for the bitmask (1 bit per entity)
+
+                    currentOffset = (currentOffset + Chunk.BIT_ALIGNMENT_MINUS_ONE) & ~Chunk.BIT_ALIGNMENT_MINUS_ONE; // Align
+                    bitmaskOffset = currentOffset;
+                    currentOffset += bitmaskSize;
+                }
+
+                tempBitmaskOffsets[i] = bitmaskOffset;
+
+                if (currentOffset > Chunk.CHUNK_BUFFER_SIZE)
+                {
+                    fits = false;
+                    break;
+                }
+            }
+
+            if (fits)
+            {
+                for (var i = 0; i < components.Length; i++)
+                {
+                    _layouts[i] = new ComponentMemoryLayout
+                    {
+                        componentID = components[i].id,
+                        offset = tempOffsets[i],
+                        size = components[i].size,
+                        enableBitsOffset = tempBitmaskOffsets[i],
+                        versionIndex = i
+                    };
+
+                    _componentIDToLayoutIndex[components[i].id] = i;
+                }
+
+                return;
+            }
+
+            _entityCapacity--;
+        }
+    }
+
+    public void AllocateEntity(out int chunkIndex, out int rowIndex)
+    {
+        var world = World.GetWorldUncheck(_worldID);
+
+        for (var i = 0; i < _chunks.Count; i++)
+        {
+            ref var chunk = ref _chunks[i];
+            if (chunk._count < _entityCapacity)
+            {
+                rowIndex = chunk._count;
+                chunk._count++;
+                chunk._structuralVersion = world.Version;
+                chunkIndex = i;
+
+                return;
+            }
+        }
+
+        // Need to allocate a new chunk
+        var newChunk = new Chunk(Chunk.CHUNK_BUFFER_SIZE, _entityCapacity, _layouts.Count, world.Version);
+#if DEBUG || GHOST_EDITOR
+        newChunk._worldID = _worldID;
+        newChunk._archetypeID = _id;
+#endif
+
+        // Set all enable to true by default for enableable components
+        for (var i = 0; i < _layouts.Count; i++)
+        {
+            var layout = _layouts[i];
+            if (layout.enableBitsOffset != -1)
+            {
+                var pChunk = newChunk.GetUnsafePtr();
+                var pBits = pChunk + layout.enableBitsOffset;
+                MemoryUtility.MemSet(pBits, 0xFF, (nuint)((_entityCapacity + Chunk.BIT_ALIGNMENT_MINUS_ONE) / Chunk.BIT_ALIGNMENT));
+            }
+        }
+
+        rowIndex = 0;
+        newChunk._count++;
+        chunkIndex = _chunks.Count;
+
+        _chunks.Add(newChunk);
+    }
+
+    [MethodImpl(MethodImplOptions.AggressiveInlining)]
+    public readonly void SetEntity(int chunkIndex, int rowIndex, Entity entity)
+    {
+        var chunk = _chunks[chunkIndex];
+        var chunkBase = chunk.GetUnsafePtr();
+        var dst = chunkBase + _entityIdsOffset + (sizeof(Entity) * rowIndex);
+
+        MemoryUtility.MemCpy(dst, &entity, (nuint)sizeof(Entity));
+    }
+
+    [MethodImpl(MethodImplOptions.AggressiveInlining)]
+    public readonly ErrorStatus SetComponentData(int chunkIndex, int rowIndex, Identifier<IComponent> componentID, void* pComponent)
+    {
+        var r = GetLayout(componentID);
+        if (r.Error != ErrorStatus.None)
+        {
+            return r.Error;
+        }
+
+        var offset = r.Value.offset;
+        ref var chunk = ref _chunks[chunkIndex];
+
+        var chunkBase = chunk.GetUnsafePtr();
+        var size = ComponentRegister.GetComponentInfo(componentID).size;
+        var dst = chunkBase + offset + (size * rowIndex);
+
+        MemoryUtility.MemCpy(dst, pComponent, (nuint)size);
+
+        var world = World.GetWorldUncheck(_worldID);
+        MarkChanged(chunkIndex, componentID, world.Version);
+
+        return ErrorStatus.None;
+    }
+
+    [MethodImpl(MethodImplOptions.AggressiveInlining)]
+    public readonly void* GetComponentData(int chunkIndex, int rowIndex, Identifier<IComponent> componentID)
+    {
+        var r = GetLayout(componentID);
+        if (r.Error != ErrorStatus.None)
+        {
+            return null;
+        }
+
+        var offset = r.Value.offset;
+        var chunk = _chunks[chunkIndex];
+
+        var chunkBase = chunk.GetUnsafePtr();
+        var size = ComponentRegister.GetComponentInfo(componentID).size;
+        return chunkBase + offset + (size * rowIndex);
+    }
+
+    [MethodImpl(MethodImplOptions.AggressiveInlining)]
+    public ref Chunk GetChunkReference(int index)
+    {
+        return ref _chunks[index];
+    }
+
+    [MethodImpl(MethodImplOptions.AggressiveInlining)]
+    public readonly Result<ComponentMemoryLayout, ErrorStatus> GetLayout(int componentID)
+    {
+        if (componentID >= _componentIDToLayoutIndex.Count)
+        {
+            return ErrorStatus.InvalidArgument;
+        }
+
+        var layoutIndex = _componentIDToLayoutIndex[componentID];
+        if (layoutIndex == -1)
+        {
+            return ErrorStatus.NotFound;
+        }
+
+        return _layouts[layoutIndex];
+    }
+
+    [MethodImpl(MethodImplOptions.AggressiveInlining)]
+    public readonly ErrorStatus MarkChanged(int chunkIndex, int componentTypeId, int globalVersion)
+    {
+        var layoutResult = GetLayout(componentTypeId);
+        if (layoutResult.IsFailure)
+        {
+            return layoutResult.Error;
+        }
+
+        ref var chunk = ref _chunks[chunkIndex];
+        chunk.GetVersionUnsafePtr()[layoutResult.Value.versionIndex] = globalVersion;
+
+        return ErrorStatus.None;
+    }
+
+    [MethodImpl(MethodImplOptions.AggressiveInlining)]
+    public readonly Result<int, ErrorStatus> GetVersion(int chunkIndex, int componentTypeId)
+    {
+        var layoutResult = GetLayout(componentTypeId);
+        if (layoutResult.Error != ErrorStatus.None)
+        {
+            return layoutResult.Error;
+        }
+
+        ref var chunk = ref _chunks[chunkIndex];
+        return chunk.GetVersionUnsafePtr()[layoutResult.Value.versionIndex];
+    }
+
+    public ErrorStatus RemoveEntity(int chunkIndex, int rowIndex)
+    {
+        if (chunkIndex < 0 || chunkIndex >= _chunks.Count)
+        {
+            return ErrorStatus.InvalidArgument;
+        }
+
+        var world = World.GetWorldUncheck(_worldID);
+        ref var chunk = ref _chunks[chunkIndex];
+        var lastIndex = chunk._count - 1;
+
+        // If we are NOT removing the very last entity, we must swap.
+        if (rowIndex != lastIndex)
+        {
+            var chunkBase = chunk.GetUnsafePtr();
+            var pLastEntity = chunkBase + _entityIdsOffset + (sizeof(Entity) * lastIndex);
+            var pRowEntity = chunkBase + _entityIdsOffset + (sizeof(Entity) * rowIndex);
+
+            var result = world.EntityManager.UpdateEntityLocation(*(Entity*)pLastEntity, _id, chunkIndex, rowIndex);
+            if (result != ErrorStatus.None)
+            {
+                return result;
+            }
+
+            // Only operate the swap back after the update is succeed.
+            MemoryUtility.MemCpy(pRowEntity, pLastEntity, (nuint)sizeof(Entity));
+
+            for (var i = 0; i < _layouts.Count; i++)
+            {
+                var layout = _layouts[i];
+
+                var pRow = chunk.GetUnsafePtr() + layout.offset + (layout.size * rowIndex);
+                var pLast = chunk.GetUnsafePtr() + layout.offset + (layout.size * lastIndex);
+
+                MemoryUtility.MemCpy(pRow, pLast, (nuint)layout.size);
+            }
+        }
+
+        chunk._count--;
+        chunk._structuralVersion = world.Version;
+
+        return ErrorStatus.None;
+    }
+
+    public ErrorStatus RemoveEntities(int chunkIndex, ReadOnlySpan<int> sortedIndicesToRemove)
+    {
+        if (chunkIndex < 0 || chunkIndex >= _chunks.Count)
+        {
+            return ErrorStatus.InvalidArgument;
+        }
+
+        if (sortedIndicesToRemove.Length == 0)
+        {
+            return ErrorStatus.None;
+        }
+
+        ref var chunk = ref _chunks[chunkIndex];
+
+        int oldCount = chunk._count;
+        int removeCount = sortedIndicesToRemove.Length;
+        int newCount = oldCount - removeCount; // The boundary between "Keep" and "Drop"
+
+        var chunkBase = chunk.GetUnsafePtr();
+        var world = World.GetWorldUncheck(_worldID); // Typo fixed from 'wrold'
+
+        // Pointers for the swap logic
+        // 1. 'holePtr' tracks which index in the sorted list we are processing
+        int holePtr = 0;
+
+        // 2. 'candidateIndex' starts at the end of the OLD array and moves backward
+        int candidateIndex = oldCount - 1;
+
+        // 3. 'removalTailPtr' tracks removals at the end of the array to skip them
+        int removalTailPtr = sortedIndicesToRemove.Length - 1;
+
+        // Iterate through the holes that are strictly INSIDE the new valid range
+        while (holePtr < removeCount)
+        {
+            int holeIndex = sortedIndicesToRemove[holePtr];
+
+            // If the current hole is beyond the new count, it's in the "Drop Zone".
+            // Since the list is sorted, all subsequent holes are also in the drop zone.
+            // We are done filling holes.
+            if (holeIndex >= newCount)
+                break;
+
+            // --- Find a Valid Filler ---
+            // We look for an entity at the end of the array that IS NOT scheduled for removal.
+            while (candidateIndex >= newCount)
+            {
+                // Check if the current candidate is actually marked for removal
+                bool isCandidateRemoved = false;
+
+                // Because sortedIndices is sorted, we check the end of the list 
+                // to see if the candidateIndex matches a removal request.
+                if (removalTailPtr >= 0 && sortedIndicesToRemove[removalTailPtr] == candidateIndex)
+                {
+                    isCandidateRemoved = true;
+                    removalTailPtr--; // Consume this removal
+                }
+
+                if (!isCandidateRemoved)
+                {
+                    // Found a valid filler!
+                    break;
+                }
+
+                // This candidate was also removed, so skip it and keep looking left
+                candidateIndex--;
+            }
+
+            // --- Perform The Swap ---
+            // Move 'candidateIndex' (Filler) into 'holeIndex' (Hole)
+
+            var pFillerEntity = chunkBase + _entityIdsOffset + (sizeof(Entity) * candidateIndex);
+            var pHoleEntity = chunkBase + _entityIdsOffset + (sizeof(Entity) * holeIndex);
+
+            // 1. Update the Map (Critical Step)
+            // We tell the world: "The entity that WAS at 'candidateIndex' is now at 'holeIndex'"
+            var result = world.EntityManager.UpdateEntityLocation(*(Entity*)pFillerEntity, _id, chunkIndex, holeIndex);
+            if (result != ErrorStatus.None)
+            {
+                return result;
+            }
+
+            // 2. Overwrite Entity ID
+            MemoryUtility.MemCpy(pHoleEntity, pFillerEntity, (nuint)sizeof(Entity));
+
+            // 3. Overwrite Components
+            for (var i = 0; i < _layouts.Count; i++)
+            {
+                var layout = _layouts[i];
+                var pRow = chunkBase + layout.offset + (layout.size * holeIndex);
+                var pLast = chunkBase + layout.offset + (layout.size * candidateIndex);
+                MemoryUtility.MemCpy(pRow, pLast, (nuint)layout.size);
+            }
+
+            // Prepare for next hole
+            holePtr++;
+            candidateIndex--;
+        }
+
+        chunk._count = newCount;
+        chunk._structuralVersion = world.Version;
+
+        return ErrorStatus.None;
+    }
+
+    [MethodImpl(MethodImplOptions.AggressiveInlining)]
+    public readonly bool HasComponent(Identifier<IComponent> componentID)
+    {
+        return _signature.IsSet(componentID);
+    }
+
+    [MethodImpl(MethodImplOptions.AggressiveInlining)]
+    public void AddEdgeAdd(Identifier<IComponent> componentID, Identifier<Archetype> targetArchetype)
+    {
+        _edgesAdd.Add(new Edge
+        {
+            componentID = componentID,
+            targetArchetype = targetArchetype
+        });
+    }
+
+    [MethodImpl(MethodImplOptions.AggressiveInlining)]
+    public readonly Identifier<Archetype> GetEdgeAdd(Identifier<IComponent> componentID)
+    {
+        for (var i = 0; i < _edgesAdd.Count; i++)
+        {
+            var edge = _edgesAdd[i];
+            if (edge.componentID == componentID)
+            {
+                return edge.targetArchetype;
+            }
+        }
+
+        return Identifier<Archetype>.Invalid;
+    }
+
+    [MethodImpl(MethodImplOptions.AggressiveInlining)]
+    public void AddEdgeRemove(Identifier<IComponent> componentID, Identifier<Archetype> targetArchetype)
+    {
+        _edgesRemove.Add(new Edge
+        {
+            componentID = componentID,
+            targetArchetype = targetArchetype
+        });
+    }
+
+    [MethodImpl(MethodImplOptions.AggressiveInlining)]
+    public readonly Identifier<Archetype> GetEdgeRemove(Identifier<IComponent> componentID)
+    {
+        for (var i = 0; i < _edgesRemove.Count; i++)
+        {
+            var edge = _edgesRemove[i];
+            if (edge.componentID == componentID)
+            {
+                return edge.targetArchetype;
+            }
+        }
+
+        return Identifier<Archetype>.Invalid;
+    }
+
+    public override readonly int GetHashCode()
+    {
+        return _hash;
+    }
+
+    public void Dispose()
+    {
+        if (_chunks.IsCreated)
+        {
+            foreach (ref var chunk in _chunks)
+            {
+                chunk.Dispose();
+            }
+        }
+
+        _signature.Dispose();
+        _chunks.Dispose();
+        _componentIDToLayoutIndex.Dispose();
+        _layouts.Dispose();
+        _edgesAdd.Dispose();
+        _edgesRemove.Dispose();
+    }
+}

Ghost.Entities/AssemblyInfo.cs

@@ -1,6 +1,5 @@
 global using EntityID = System.Int32;
-global using GenerationID = System.UInt16;
-global using WorldID = System.UInt16;
+global using GenerationID = System.Int32;
 
 using Ghost.Core.Attributes;
 using System.Runtime.CompilerServices;
@@ -10,3 +9,4 @@ using System.Runtime.CompilerServices;
 [assembly: InternalsVisibleTo("Ghost.Entities.Test")]
 
 [assembly: EngineAssembly]
+

Ghost.Entities/Common.cs

@@ -0,0 +1,19 @@
+namespace Ghost.Entities;
+
+public readonly struct TimeData
+{
+    public int FrameCount
+    {
+        get; init;
+    }
+
+    public float DeltaTime
+    {
+        get; init;
+    }
+
+    public double ElapsedTime
+    {
+        get; init;
+    }
+}

Ghost.Entities/Component.cs

@@ -0,0 +1,125 @@
+using Ghost.Core;
+using Misaki.HighPerformance.LowLevel.Collections;
+using Misaki.HighPerformance.LowLevel.Utilities;
+using System.Runtime.CompilerServices;
+
+namespace Ghost.Entities;
+
+public interface IComponent
+{
+}
+
+public interface IEnableableComponent : IComponent
+{
+}
+
+internal struct ComponentInfo
+{
+    // public string stableName; // Do we actually need this?
+    public int id;
+    public int size;
+    public int alignment;
+    public bool isEnableable;
+}
+
+public static class ComponentTypeID<T>
+    where T : unmanaged, IComponent
+{
+    public static readonly Identifier<IComponent> value = ComponentRegister.GetOrRegisterComponent<T>();
+}
+
+internal static class ComponentRegister
+{
+    private static readonly List<ComponentInfo> s_registeredComponents = new();
+    private static readonly Dictionary<IntPtr, int> s_typeHandleToID = new();
+    private static readonly Dictionary<string, int> s_nameToRuntimeID = new();
+#if DEBUG || GHOST_EDITOR
+    internal static readonly Dictionary<int, Type> s_runtimeIDToType = new();
+#endif
+
+    public static unsafe Identifier<IComponent> GetOrRegisterComponent<T>()
+        where T : unmanaged, IComponent
+    {
+        var type = typeof(T);
+        var typeHandle = type.TypeHandle.Value;
+
+        lock (s_registeredComponents)
+        {
+            if (s_typeHandleToID.TryGetValue(typeHandle, out var existingID))
+            {
+                return existingID;
+            }
+
+            var newID = new Identifier<IComponent>(s_registeredComponents.Count);
+            var stableName = typeof(T).FullName ?? typeof(T).Name;
+            var info = new ComponentInfo
+            {
+                // stableName = new FixedText64(stableName),
+                id = newID,
+                size = sizeof(T),
+                alignment = (int)MemoryUtility.AlignOf<T>(),
+                isEnableable = typeof(IEnableableComponent).IsAssignableFrom(type),
+                // isManaged = typeof(IManagedWrapper).IsAssignableFrom(type),
+            };
+
+            s_registeredComponents.Add(info);
+
+            s_typeHandleToID[typeHandle] = newID;
+            s_nameToRuntimeID[stableName] = newID;
+#if DEBUG || GHOST_EDITOR
+            s_runtimeIDToType[newID.value] = typeof(T);
+#endif
+
+            return newID;
+        }
+    }
+
+    [MethodImpl(MethodImplOptions.AggressiveInlining)]
+    public static Identifier<IComponent> GetComponentID(Type type)
+    {
+        var typeHandle = type.TypeHandle.Value;
+        lock (s_registeredComponents)
+        {
+            if (s_typeHandleToID.TryGetValue(typeHandle, out var existingID))
+            {
+                return existingID;
+            }
+        }
+
+        return Identifier<IComponent>.Invalid;
+    }
+
+    [MethodImpl(MethodImplOptions.AggressiveInlining)]
+    public static ComponentInfo GetComponentInfo(Identifier<IComponent> typeId)
+    {
+        lock (s_registeredComponents)
+        {
+            return s_registeredComponents[typeId];
+        }
+    }
+
+    // TODO: A ComponentSet structure to cache the hashcode for better performance.
+    public static int GetHashCode(params ReadOnlySpan<Identifier<IComponent>> componentTypeIDs)
+    {
+        var largestID = 0;
+        foreach (var id in componentTypeIDs)
+        {
+            if (id.value > largestID)
+            {
+                largestID = id.value;
+            }
+        }
+
+        var length = UnsafeBitSet.RequiredLength(largestID + 1);
+        var bits = (Span<uint>)stackalloc uint[length];
+        bits.Clear();
+
+        var bitSet = new SpanBitSet(bits);
+        foreach (var id in componentTypeIDs)
+        {
+            bitSet.SetBit(id.value);
+        }
+
+        return bitSet.GetHashCode();
+    }
+}

Ghost.Entities/Components/ComponentStorage.cs

@@ -1,715 +0,0 @@
-using Ghost.Core;
-using Misaki.HighPerformance.LowLevel.Collections;
-using System.Diagnostics.CodeAnalysis;
-using System.Runtime.CompilerServices;
-using System.Runtime.InteropServices;
-
-namespace Ghost.Entities.Components;
-
-internal static class SingletonContainer<T>
-    where T : unmanaged, IComponentData
-{
-    public static readonly Dictionary<int, T> container = new();
-}
-
-internal interface IComponentPool : IDisposable
-{
-    public EntityID Count
-    {
-        get;
-    }
-
-    public void Add(Entity entity, IComponentData component);
-    public bool Remove(Entity entity);
-    public bool Has(Entity entity);
-    public IComponentData Get(Entity entity);
-    public IntPtr GetUnsafe(Entity entity);
-    public void Set(Entity entity, in IComponentData component);
-
-    public IEnumerable<(Entity entity, IComponentData component)> Enumerate();
-}
-
-internal interface IComponentPool<T> : IComponentPool
-    where T : IComponentData
-{
-    public void Add(Entity entity, T Component);
-    public void Set(Entity entity, in T component);
-}
-
-internal class ComponentPool<T> : IComponentPool<T>
-    where T : unmanaged, IComponentData
-{
-    private struct ComponentMetadata
-    {
-        public T data;
-        public Entity owner;
-    }
-
-    private EntityID _nextId;
-    private EntityID _capacity;
-
-    private ComponentMetadata[] _components;
-    private EntityID[] _lookup;
-
-    public EntityID Count => _nextId;
-
-    public ComponentPool(int initialSize)
-    {
-        _nextId = 0;
-        _capacity = initialSize;
-
-        _components = new ComponentMetadata[initialSize];
-        _lookup = new EntityID[initialSize];
-
-        _lookup.AsSpan().Fill(Entity.INVALID_ID);
-    }
-
-    public ComponentPool()
-        : this(16)
-    {
-    }
-
-    [MethodImpl(MethodImplOptions.AggressiveInlining)]
-    private static EntityID GetLookupIndex(Entity entity)
-    {
-        return entity.ID;
-    }
-
-    [MethodImpl(MethodImplOptions.AggressiveInlining)]
-    private EntityID GetComponentIndex(Entity entity)
-    {
-        return _lookup[GetLookupIndex(entity)];
-    }
-
-    public void Add(Entity entity, IComponentData component)
-    {
-        if (component is not T typedComponent)
-        {
-            throw new ArgumentException($"Component type mismatch. Expected {typeof(T)}, but got {component.GetType()}.");
-        }
-
-        Add(entity, typedComponent);
-    }
-
-    public void Add(Entity entity, T component)
-    {
-        if (!entity.IsValid)
-        {
-            return;
-        }
-
-        var lookupIndex = GetLookupIndex(entity);
-        var componentIndex = GetComponentIndex(entity);
-
-        if (componentIndex != Entity.INVALID_ID)
-        {
-            // Overwrite the old data if generation is larger
-            if (entity.Generation > _components[componentIndex].owner.Generation)
-            {
-                var index = _lookup[lookupIndex];
-                _components[index].data = component;
-                _components[index].owner = entity;
-            }
-
-            return;
-        }
-
-        if (_nextId >= _capacity)
-        {
-            var newCapacity = _capacity * 2;
-            Array.Resize(ref _components, newCapacity);
-            Array.Resize(ref _lookup, newCapacity);
-            _lookup.AsSpan(_capacity, newCapacity - _capacity).Fill(Entity.INVALID_ID);
-
-            _capacity = newCapacity;
-        }
-
-        _lookup[lookupIndex] = _nextId;
-        _components[_nextId] = new ComponentMetadata
-        {
-            data = component,
-            owner = entity
-        };
-
-        _nextId++;
-    }
-
-    public bool Remove(Entity entity)
-    {
-        // We do not remove anything here, the generation of the entity will be used to determine if the component is valid.
-        return true;
-    }
-
-    public IComponentData Get(Entity entity)
-    {
-        return GetRef(entity);
-    }
-
-    public unsafe IntPtr GetUnsafe(Entity entity)
-    {
-        return (IntPtr)Unsafe.AsPointer(ref GetRef(entity));
-    }
-
-    public ref T GetRef(Entity entity)
-    {
-        if (!entity.IsValid)
-        {
-            return ref Unsafe.NullRef<T>();
-        }
-
-        var index = GetComponentIndex(entity);
-        return ref _components[index].data;
-    }
-
-    public bool Has(Entity entity)
-    {
-        if (entity.ID >= _lookup.Length)
-        {
-            return false;
-        }
-
-        var index = GetComponentIndex(entity);
-        return index != Entity.INVALID_ID && _components[index].owner.Generation == entity.Generation;
-    }
-
-    public void Set(Entity entity, in IComponentData component)
-    {
-        if (component is not T typedComponent)
-        {
-            throw new ArgumentException($"Component type mismatch. Expected {typeof(T)}, but got {component.GetType()}.");
-        }
-        Set(entity, typedComponent);
-    }
-
-    public void Set(Entity entity, in T component)
-    {
-        if (!entity.IsValid || entity.ID >= _lookup.Length || GetComponentIndex(entity) == Entity.INVALID_ID)
-        {
-            return;
-        }
-
-        var index = GetComponentIndex(entity);
-        _components[index].data = component;
-        _components[index].owner = entity;
-    }
-
-    public IEnumerable<(Entity entity, IComponentData component)> Enumerate()
-    {
-        for (var i = 0; i < _nextId; i++)
-        {
-            if (_components[i].owner.IsValid)
-            {
-                yield return (_components[i].owner, _components[i].data);
-            }
-        }
-    }
-
-    public void Dispose()
-    {
-        _components = Array.Empty<ComponentMetadata>();
-        _lookup = Array.Empty<EntityID>();
-        _nextId = 0;
-        _capacity = 0;
-    }
-}
-
-internal class ScriptComponentPool : IComponentPool<ScriptComponent>
-{
-    private Dictionary<Entity, List<ScriptComponent>>? _scriptComponents;
-    private List<ScriptComponent>? _executionList;
-
-    private readonly World _world;
-
-    internal IReadOnlyDictionary<Entity, List<ScriptComponent>>? ScriptComponents => _scriptComponents;
-    internal IReadOnlyList<ScriptComponent>? ExecutionList => _executionList;
-
-    public bool IsInitialized => _scriptComponents != null;
-    public int Count => _scriptComponents?.Keys.Count ?? 0;
-
-    public ScriptComponentPool(World world)
-    {
-        _world = world;
-    }
-
-    internal void Initialize(int capacity = 16)
-    {
-        _scriptComponents ??= new(capacity);
-    }
-
-    internal void RebuildExecutionList()
-    {
-        if (_scriptComponents == null)
-        {
-            return;
-        }
-
-        _executionList ??= new List<ScriptComponent>(_scriptComponents.Count);
-        _executionList.Clear();
-
-        foreach (var kvp in _scriptComponents)
-        {
-            _executionList.AddRange(kvp.Value);
-        }
-
-        _executionList.Sort((a, b) => a.ExecutionOrder.CompareTo(b.ExecutionOrder));
-    }
-
-    public void Add(Entity entity, IComponentData component)
-    {
-        if (component is not ScriptComponent scriptComponent)
-        {
-            throw new ArgumentException($"Component type mismatch. Expected {typeof(ScriptComponent)}, but got {component.GetType()}.");
-        }
-
-        Add(entity, scriptComponent);
-    }
-
-    public void Add(Entity entity, ScriptComponent component)
-    {
-        if (!IsInitialized)
-        {
-            Initialize();
-        }
-
-        ref var scriptList = ref CollectionsMarshal.GetValueRefOrAddDefault(_scriptComponents!, entity, out var exists);
-        scriptList ??= new List<ScriptComponent>();
-
-        scriptList.Add(component);
-
-        component.Owner = entity;
-        component._world = _world;
-        component.Enable = true;
-        component.Initialize();
-    }
-
-    public bool Remove<T>(Entity entity)
-        where T : ScriptComponent
-    {
-        if (!Has(entity)
-            || !_scriptComponents!.TryGetValue(entity, out var scriptList)
-            || scriptList == null)
-        {
-            return false;
-        }
-
-        var scriptToRemove = scriptList.FirstOrDefault(script => script is T);
-        if (scriptToRemove == null)
-        {
-            return false;
-        }
-
-        scriptToRemove.OnDestroy();
-        scriptList.Remove(scriptToRemove);
-        if (scriptList.Count == 0)
-        {
-            _scriptComponents.Remove(entity);
-        }
-
-        return true;
-    }
-
-    public bool RemoveAt(Entity entity, int index)
-    {
-        if (!Has(entity)
-            || !_scriptComponents!.TryGetValue(entity, out var scriptList)
-            || scriptList == null)
-        {
-            return false;
-        }
-
-        if (index < 0 || index > scriptList.Count)
-        {
-            return false;
-        }
-
-        scriptList.RemoveAt(index);
-        if (scriptList.Count == 0)
-        {
-            _scriptComponents.Remove(entity);
-        }
-
-        return true;
-    }
-
-    public bool Remove(Entity entity)
-    {
-        if (!Has(entity)
-            || !_scriptComponents!.TryGetValue(entity, out var scriptList)
-            || scriptList == null)
-        {
-            return false;
-        }
-
-        foreach (var script in scriptList)
-        {
-            script.OnDestroy();
-        }
-
-        _scriptComponents.Remove(entity);
-        return true;
-    }
-
-    public bool Has(Entity entity)
-    {
-        return _scriptComponents?.ContainsKey(entity) ?? false;
-    }
-
-    [Obsolete("Use GetAll instead of Get for ScriptComponentPool.")]
-    public IComponentData Get(Entity entity)
-    {
-        if (!Has(entity)
-            || !_scriptComponents!.TryGetValue(entity, out var scriptList)
-            || scriptList == null
-            || scriptList.Count == 0)
-        {
-            return null!;
-        }
-
-        return scriptList[0];
-    }
-
-    [Obsolete("Use GetAll instead of GetUnsafe for ScriptComponentPool.")]
-    public unsafe IntPtr GetUnsafe(Entity entity)
-    {
-        if (!Has(entity)
-            || !_scriptComponents!.TryGetValue(entity, out var scriptList)
-            || scriptList == null
-            || scriptList.Count == 0)
-        {
-            return IntPtr.Zero;
-        }
-
-        return (IntPtr)Unsafe.AsPointer(ref CollectionsMarshal.AsSpan(scriptList)[0]);
-    }
-
-    public void Set(Entity entity, in IComponentData component)
-    {
-        if (component is not ScriptComponent scriptComponent)
-        {
-            throw new ArgumentException($"Component type mismatch. Expected {typeof(ScriptComponent)}, but got {component.GetType()}.");
-        }
-        Set(entity, scriptComponent);
-    }
-
-    public void Set(Entity entity, in ScriptComponent component)
-    {
-        if (!Has(entity)
-            || !_scriptComponents!.TryGetValue(entity, out var scriptList)
-            || scriptList == null)
-        {
-            return;
-        }
-        var index = scriptList.IndexOf(component);
-        if (index >= 0)
-        {
-            scriptList[index] = component;
-            component.Owner = entity;
-        }
-    }
-
-    public IEnumerable<(Entity entity, IComponentData component)> Enumerate()
-    {
-        if (_scriptComponents == null)
-        {
-            yield break;
-        }
-
-        foreach (var kvp in _scriptComponents)
-        {
-            foreach (var script in kvp.Value)
-            {
-                yield return (kvp.Key, script);
-            }
-        }
-    }
-
-    public IReadOnlyList<IComponentData>? GetAll(Entity entity)
-    {
-        if (_scriptComponents == null
-            || !_scriptComponents.TryGetValue(entity, out var scriptList))
-        {
-            return null;
-        }
-
-        return scriptList;
-    }
-
-    public void Dispose()
-    {
-        if (_scriptComponents != null)
-        {
-            if (_executionList != null)
-            {
-                foreach (var script in _executionList)
-                {
-                    script.OnDestroy();
-                }
-
-                _executionList.Clear();
-            }
-            else
-            {
-                foreach (var scriptList in _scriptComponents.Values)
-                {
-                    if (scriptList == null)
-                    {
-                        continue;
-                    }
-
-                    foreach (var script in scriptList)
-                    {
-                        script.OnDestroy();
-                    }
-                }
-
-            }
-
-            _scriptComponents.Clear();
-        }
-    }
-}
-
-[SkipLocalsInit]
-internal struct ComponentStorage : IDisposable
-{
-    private static int s_nextId = 0;
-    private static class TypeID<T>
-    {
-        public static readonly int value = s_nextId++;
-    }
-
-    private int _currentCapacity = 16;
-
-    private IComponentPool?[] _componentPools = new IComponentPool[16];
-    private UnsafeBitSet[] _componentEntityMasks = new UnsafeBitSet[16];
-
-    private readonly Dictionary<TypeHandle, int> _typeIDMap = new(16);
-    private readonly Dictionary<int, TypeHandle> _typeHandleMap = new(16);
-
-    private readonly ScriptComponentPool _scriptComponentPool;
-
-    private readonly World _world;
-
-    internal ComponentStorage(World world)
-    {
-        _world = world;
-        _scriptComponentPool = new ScriptComponentPool(world);
-    }
-
-    internal readonly IReadOnlyList<IComponentPool?> ComponentPools => _componentPools;
-    internal readonly IReadOnlyList<UnsafeBitSet> ComponentEntityMasks => _componentEntityMasks;
-    internal readonly ScriptComponentPool ScriptComponentPool => _scriptComponentPool;
-
-    [MethodImpl(MethodImplOptions.AggressiveInlining)]
-    private readonly int GetTypeID(TypeHandle typeHandle)
-    {
-        if (_typeIDMap.TryGetValue(typeHandle, out var id))
-        {
-            return id;
-        }
-
-        return typeof(TypeID<>).MakeGenericType(typeHandle!)
-            .GetField("value", System.Reflection.BindingFlags.Static | System.Reflection.BindingFlags.Public)
-            ?.GetValue(null) as int? ?? -1;
-    }
-
-    [MethodImpl(MethodImplOptions.AggressiveInlining)]
-    private readonly int GetTypeID<T>()
-    {
-        return TypeID<T>.value;
-    }
-
-    [MethodImpl(MethodImplOptions.AggressiveInlining)]
-    private void Resize(int newCapacity)
-    {
-        Array.Resize(ref _componentPools, newCapacity);
-        Array.Resize(ref _componentEntityMasks, newCapacity);
-        _currentCapacity = newCapacity;
-    }
-
-    [MethodImpl(MethodImplOptions.AggressiveInlining)]
-    internal readonly TypeHandle GetComponentPoolType(int poolIndex)
-    {
-        if (poolIndex < 0 || poolIndex >= _currentCapacity)
-        {
-            throw new ArgumentOutOfRangeException(nameof(poolIndex), "Invalid pool index.");
-        }
-
-        return _typeHandleMap[poolIndex];
-    }
-
-    [MethodImpl(MethodImplOptions.AggressiveInlining)]
-    public readonly bool TryGetPool(TypeHandle typeHandle, [NotNullWhen(true)] out IComponentPool? pool)
-    {
-        var result = _typeIDMap.TryGetValue(typeHandle, out var id);
-        if (!result || id >= _currentCapacity)
-        {
-            pool = null;
-            return false;
-        }
-
-        pool = _componentPools[id];
-        return pool != null;
-    }
-
-    [MethodImpl(MethodImplOptions.AggressiveInlining)]
-    public readonly bool TryGetPool(Type type, [NotNullWhen(true)] out IComponentPool? pool)
-    {
-        return TryGetPool(TypeHandle.Get(type), out pool);
-    }
-
-    [MethodImpl(MethodImplOptions.AggressiveInlining)]
-    public readonly bool TryGetPool<T>([NotNullWhen(true)] out ComponentPool<T>? pool)
-        where T : unmanaged, IComponentData
-    {
-        var id = TypeID<T>.value;
-        if (id >= _currentCapacity)
-        {
-            pool = null;
-            return false;
-        }
-
-        pool = (ComponentPool<T>?)_componentPools[id];
-        return pool != null;
-    }
-
-    public IComponentPool GetOrCreateComponentPool(Type type)
-    {
-        var typeHandle = TypeHandle.Get(type);
-        if (_typeIDMap.TryGetValue(typeHandle, out var id))
-        {
-            if (id < _currentCapacity && _componentPools[id] is IComponentPool existingPool)
-            {
-                return existingPool;
-            }
-        }
-        else
-        {
-            id = GetTypeID(typeHandle);
-        }
-
-        if (id >= _currentCapacity)
-        {
-            Resize(_currentCapacity * 2);
-            _typeIDMap[typeHandle] = id;
-            _typeHandleMap[id] = typeHandle;
-        }
-        else if (_componentPools[id] is IComponentPool existingPool)
-        {
-            return existingPool;
-        }
-
-        var pool = Activator.CreateInstance(typeof(ComponentPool<>).MakeGenericType(type)) as IComponentPool
-            ?? throw new InvalidOperationException($"Failed to create component pool for type {type.FullName}");
-
-        _componentPools[id] = pool;
-
-        return pool;
-    }
-
-    public ComponentPool<T> GetOrCreateComponentPool<T>()
-        where T : unmanaged, IComponentData
-    {
-        var id = TypeID<T>.value;
-        var typeHandle = TypeHandle.Get<T>();
-
-        if (id >= _currentCapacity)
-        {
-            Resize(_currentCapacity * 2);
-            _typeIDMap[typeHandle] = id;
-            _typeHandleMap[id] = typeHandle;
-        }
-        else if (_componentPools[id] is ComponentPool<T> existingPool)
-        {
-            return existingPool;
-        }
-
-        var pool = new ComponentPool<T>();
-        _componentPools[id] = pool;
-
-        return pool;
-    }
-
-    [MethodImpl(MethodImplOptions.AggressiveInlining)]
-    public readonly bool TryGetMask(TypeHandle typeHandle, [NotNullWhen(true)] out UnsafeBitSet? bitSet)
-    {
-        if (!_typeIDMap.TryGetValue(typeHandle, out var id)
-            || id >= _currentCapacity)
-        {
-            bitSet = null;
-            return false;
-        }
-
-        bitSet = _componentEntityMasks[id];
-        return bitSet.HasValue;
-    }
-
-    [MethodImpl(MethodImplOptions.AggressiveInlining)]
-    public readonly bool TryGetMask<T>([NotNullWhen(true)] out UnsafeBitSet? bitSet)
-        where T : unmanaged, IComponentData
-    {
-        return TryGetMask(TypeHandle.Get<T>(), out bitSet);
-    }
-
-    public ref UnsafeBitSet GetOrCreateMask(TypeHandle typeHandle)
-    {
-        if (!_typeIDMap.TryGetValue(typeHandle, out var id))
-        {
-            id = GetTypeID(typeHandle);
-            _typeIDMap[typeHandle] = id;
-            _typeHandleMap[id] = typeHandle;
-        }
-
-        if (id >= _currentCapacity)
-        {
-            Resize(_currentCapacity * 2);
-        }
-
-        ref var set = ref _componentEntityMasks[id];
-        if (!set.IsCreated)
-        {
-            set = new UnsafeBitSet();
-        }
-
-        return ref set;
-    }
-
-    public ref UnsafeBitSet GetOrCreateMask<T>()
-        where T : unmanaged, IComponentData
-    {
-        return ref GetOrCreateMask(TypeHandle.Get<T>());
-    }
-
-    public ref UnsafeBitSet GetOrCreateMask(Type type)
-    {
-        return ref GetOrCreateMask(TypeHandle.Get(type));
-    }
-
-    [MethodImpl(MethodImplOptions.AggressiveInlining)]
-    public readonly void RebuildExecutionList()
-    {
-        _scriptComponentPool.RebuildExecutionList();
-    }
-
-    [MethodImpl(MethodImplOptions.AggressiveInlining)]
-    public readonly void Remove(Entity entity)
-    {
-        _scriptComponentPool.Remove(entity);
-    }
-
-    [MethodImpl(MethodImplOptions.AggressiveInlining)]
-    public readonly void Dispose()
-    {
-        foreach (var pool in _componentPools)
-        {
-            pool?.Dispose();
-        }
-
-        foreach (var bitSet in _componentEntityMasks)
-        {
-            bitSet.Dispose();
-        }
-
-        _scriptComponentPool.Dispose();
-    }
-}

Ghost.Entities/Components/IComponentData.cs

@@ -1,5 +0,0 @@
-namespace Ghost.Entities.Components;
-
-public interface IComponentData
-{
-}

Ghost.Entities/Components/ScriptComponent.cs

@@ -1,110 +0,0 @@
-namespace Ghost.Entities.Components;
-
-public abstract class ScriptComponent : IComponentData
-{
-    private bool _enable;
-
-    internal World _world = null!;
-
-    /// <summary>
-    /// Gets or sets a Value indicating whether this script component is enabled.
-    /// </summary>
-    public bool Enable
-    {
-        get => _enable;
-        set
-        {
-            if (_enable == value)
-            {
-                return;
-            }
-
-            _enable = value;
-            if (_enable)
-            {
-                OnEnable();
-            }
-            else
-            {
-                OnDisable();
-            }
-        }
-    }
-
-    /// <summary>
-    /// Gets the entity that owns this script component.
-    /// </summary>
-    public Entity Owner
-    {
-        get;
-        internal set;
-    }
-
-    /// <summary>
-    /// Gets the EntityManager instance associated with the current world.
-    /// </summary>
-    protected EntityManager EntityManager => _world.EntityManager;
-
-    /// <summary>
-    /// Gets or sets the priority of the script component.
-    /// Change this during runtime does not affect the execution order.
-    /// </summary>
-    public virtual int ExecutionOrder => 0;
-
-    /// <summary>
-    /// Called when the script component is enabled.
-    /// </summary>
-    public virtual void OnEnable()
-    {
-    }
-
-    /// <summary>
-    /// Called when the script component is disabled.
-    /// </summary>
-    public virtual void OnDisable()
-    {
-    }
-
-    /// <summary>
-    /// Called when the script component is initialized.
-    /// </summary>
-    public virtual void Initialize()
-    {
-    }
-
-    /// <summary>
-    /// Called when the script component is started.
-    /// </summary>
-    public virtual void Start()
-    {
-    }
-
-    /// <summary>
-    /// Called every frame.
-    /// </summary>
-    public virtual void Update()
-    {
-    }
-
-    /// <summary>
-    /// Called every frame after all Update methods have been called.
-    /// </summary>
-    public virtual void LateUpdate()
-    {
-    }
-
-    /// <summary>
-    /// Called at a fixed interval.
-    /// This method is called at a fixed time step, independent of the frame rate.
-    /// </summary>
-    public virtual void FixedUpdate()
-    {
-    }
-
-    /// <summary>
-    /// Called when the script component is destroyed.
-    /// </summary>
-    public virtual void OnDestroy()
-    {
-    }
-}

Ghost.Entities/Entity.cs

@@ -1,30 +1,29 @@
 using System.Runtime.CompilerServices;
-using System.Text.Json.Serialization;
+using System.Runtime.InteropServices;
 
 namespace Ghost.Entities;
 
-[SkipLocalsInit]
-public struct Entity : IEquatable<Entity>, IComparable<Entity>
+[StructLayout(LayoutKind.Sequential, Size = 8)]
+public readonly record struct Entity
 {
     public const EntityID INVALID_ID = -1;
 
-    [JsonInclude]
-    private EntityID _id;
-    private GenerationID _generation;
+    private readonly EntityID _id;
+    private readonly GenerationID _generation;
 
-    public readonly EntityID ID
+    public EntityID ID
     {
         [MethodImpl(MethodImplOptions.AggressiveInlining)]
         get => _id;
     }
 
-    public readonly GenerationID Generation
+    public GenerationID Generation
     {
         [MethodImpl(MethodImplOptions.AggressiveInlining)]
         get => _generation;
     }
 
-    public readonly bool IsValid
+    public bool IsValid
     {
         [MethodImpl(MethodImplOptions.AggressiveInlining)]
         get => ID != INVALID_ID;
@@ -42,40 +41,7 @@ public struct Entity : IEquatable<Entity>, IComparable<Entity>
         _generation = generation;
     }
 
-    [MethodImpl(MethodImplOptions.AggressiveInlining)]
-    internal void IncrementGeneration() => _generation++;
-
-    public readonly bool Equals(Entity other)
-    {
-        return _id == other._id && _generation == other._generation;
-    }
-
-    public readonly int CompareTo(Entity other)
-    {
-        return _id.CompareTo(other._id);
-    }
-
-    public override readonly bool Equals(object? obj)
-    {
-        return obj is Entity other && Equals(other);
-    }
-
-    public override readonly int GetHashCode()
-    {
-        return _id.GetHashCode();
-    }
-
-    public static bool operator ==(Entity left, Entity right)
-    {
-        return left.Equals(right);
-    }
-
-    public static bool operator !=(Entity left, Entity right)
-    {
-        return !(left == right);
-    }
-
-    public override readonly string ToString()
+    public override string ToString()
     {
         return $"Entity {{ Index: {ID}, Generation: {Generation} }}";
     }

Ghost.Entities/EntityCommandBuffer.cs

@@ -0,0 +1,222 @@
+using Ghost.Core;
+using Misaki.HighPerformance.LowLevel.Buffer;
+using Misaki.HighPerformance.LowLevel.Collections;
+using Misaki.HighPerformance.LowLevel.Utilities;
+using System.Runtime.CompilerServices;
+
+namespace Ghost.Entities;
+
+public unsafe class EntityCommandBuffer : IDisposable
+{
+    private enum ECBOpCode : byte
+    {
+        CreateEntity,
+        CreateEntityWithComponents,
+        DestroyEntity,
+        AddComponent,
+        RemoveComponent,
+        SetComponent,
+    }
+
+    private readonly EntityManager _entityManager;
+    private UnsafeList<byte> _buffer;
+    private bool _disposed;
+
+    public EntityCommandBuffer(EntityManager entityManager)
+    {
+        _entityManager = entityManager;
+        _buffer = new UnsafeList<byte>(4096, Allocator.Persistent);
+    }
+
+    ~EntityCommandBuffer()
+    {
+        Dispose();
+    }
+
+    private void WriteHeader(ECBOpCode op)
+    {
+        _buffer.Add((byte)op);
+    }
+
+    private void Write<T>(T value)
+        where T : unmanaged
+    {
+        var size = sizeof(T);
+        var idx = _buffer.Count;
+
+        if (idx + size > _buffer.Capacity)
+        {
+            _buffer.Resize(idx + size);
+        }
+
+        MemoryUtility.MemCpy((byte*)_buffer.GetUnsafePtr() + idx, &value, (nuint)size);
+    }
+
+    private void WriteSpan<T>(ReadOnlySpan<T> span)
+        where T : unmanaged
+    {
+        var size = sizeof(T) * span.Length;
+        var idx = _buffer.Count;
+
+        if (idx + size > _buffer.Capacity)
+        {
+            _buffer.Resize(idx + size);
+        }
+
+        fixed (T* ptr = span)
+        {
+            MemoryUtility.MemCpy((byte*)_buffer.GetUnsafePtr() + idx, ptr, (nuint)size);
+        }
+    }
+
+    private T Read<T>(ref int cursor)
+        where T : unmanaged
+    {
+        var size = sizeof(T);
+        var ptr = (byte*)_buffer.GetUnsafePtr();
+
+        var value = *(T*)&ptr[cursor];
+        cursor += size;
+
+        return value;
+    }
+
+    private Span<T> ReadSpan<T>(ref int cursor, int length)
+        where T : unmanaged
+    {
+        var size = sizeof(T) * length;
+        var ptr = (byte*)_buffer.GetUnsafePtr();
+
+        var span = new Span<T>(&ptr[cursor], length);
+        cursor += size;
+
+        return span;
+    }
+
+    private void* ReadBuffer(ref int cursor, int size)
+    {
+        var ptr = (byte*)_buffer.GetUnsafePtr();
+        var bufferPtr = ptr + cursor;
+        cursor += size;
+
+        return bufferPtr;
+    }
+
+    public void CreateEntity(int count = 1)
+    {
+        WriteHeader(ECBOpCode.CreateEntity);
+        Write(count);
+    }
+
+    public void CreateEntity(int count, params ReadOnlySpan<Identifier<IComponent>> componentTypeIDs)
+    {
+        WriteHeader(ECBOpCode.CreateEntityWithComponents);
+        Write(count);
+        Write(componentTypeIDs.Length);
+        WriteSpan(componentTypeIDs);
+    }
+
+    public void DestroyEntity(Entity entity)
+    {
+        WriteHeader(ECBOpCode.DestroyEntity);
+        Write(entity);
+    }
+
+    public void AddComponent<T>(Entity entity, T component = default)
+        where T : unmanaged, IComponent
+    {
+        WriteHeader(ECBOpCode.AddComponent);
+        Write(entity);
+        Write(ComponentTypeID<T>.value);
+        Write(component);
+    }
+
+    public void RemoveComponent<T>(Entity entity)
+        where T : unmanaged, IComponent
+    {
+        WriteHeader(ECBOpCode.RemoveComponent);
+        Write(entity);
+        Write(ComponentTypeID<T>.value);
+    }
+
+    public void SetComponent<T>(Entity entity, T component)
+        where T : unmanaged, IComponent
+    {
+        WriteHeader(ECBOpCode.SetComponent);
+        Write(entity);
+        Write(ComponentTypeID<T>.value);
+        Write(component);
+    }
+
+    internal void Playback()
+    {
+        var cursor = 0;
+        var length = _buffer.Count;
+
+        while (cursor < length)
+        {
+            var op = Read<ECBOpCode>(ref cursor);
+
+            switch (op)
+            {
+                case ECBOpCode.CreateEntity:
+                    var count = Read<int>(ref cursor);
+                    _entityManager.CreateEntities(count);
+                    break;
+
+                case ECBOpCode.CreateEntityWithComponents:
+                    var entityCount = Read<int>(ref cursor);
+                    var compCount = Read<int>(ref cursor);
+                    var compTypeIDs = ReadSpan<Identifier<IComponent>>(ref cursor, compCount);
+                    _entityManager.CreateEntities(entityCount, compTypeIDs);
+                    break;
+
+                case ECBOpCode.DestroyEntity:
+                    var entityToDestroy = Read<Entity>(ref cursor);
+                    _entityManager.DestroyEntity(entityToDestroy);
+                    break;
+
+                case ECBOpCode.AddComponent:
+                    var entityToAdd = Read<Entity>(ref cursor);
+                    var addCompTypeID = Read<Identifier<IComponent>>(ref cursor);
+                    var pAddCompData = ReadBuffer(ref cursor, ComponentRegister.GetComponentInfo(addCompTypeID).size);
+                    _entityManager.AddComponent(entityToAdd, addCompTypeID, pAddCompData);
+                    break;
+
+                case ECBOpCode.RemoveComponent:
+                    var entityToRemove = Read<Entity>(ref cursor);
+                    var removeCompTypeID = Read<Identifier<IComponent>>(ref cursor);
+                    _entityManager.RemoveComponent(entityToRemove, removeCompTypeID);
+                    break;
+
+                case ECBOpCode.SetComponent:
+                    var entityToSet = Read<Entity>(ref cursor);
+                    var setCompTypeID = Read<Identifier<IComponent>>(ref cursor);
+                    var pSetCompData = ReadBuffer(ref cursor, ComponentRegister.GetComponentInfo(setCompTypeID).size);
+                    _entityManager.SetComponent(entityToSet, setCompTypeID, pSetCompData);
+                    break;
+            }
+        }
+
+        Reset();
+    }
+
+    [MethodImpl(MethodImplOptions.AggressiveInlining)]
+    internal void Reset()
+    {
+        _buffer.Clear();
+    }
+
+    public void Dispose()
+    {
+        if (_disposed)
+        {
+            return;
+        }
+
+        _buffer.Dispose();
+
+        _disposed = true;
+        GC.SuppressFinalize(this);
+    }
+}

Ghost.Entities/EntityManager.Managed.cs

@@ -0,0 +1,224 @@
+using Misaki.HighPerformance.Collections;
+using Misaki.HighPerformance.Utilities;
+
+namespace Ghost.Entities;
+
+public partial class EntityManager
+{
+    private readonly SlotMap<List<ScriptComponent>> _scriptComponents;
+
+    internal SlotMap<List<ScriptComponent>> ScriptComponents => _scriptComponents;
+
+    /// <summary>
+    /// Creates a new ManagedEntity and associates it with the given Entity.
+    /// </summary>
+    /// <param name="entity">The Entity to associate with the ManagedEntity.</param>
+    /// <returns>The created ManagedEntity.</returns>
+    public ManagedEntity CreateManagedEntity(Entity entity)
+    {
+        var managedEntity = CreateManagedEntity();
+        AddComponent(entity, new ManagedEntityRef
+        {
+            entity = managedEntity
+        });
+
+        return managedEntity;
+    }
+
+    /// <summary>
+    /// Creates a new ManagedEntity.
+    /// </summary>
+    /// <remarks>
+    /// You must call this if you add <see cref="ManagedEntityRef"/> manually to an entity.
+    /// Otherwise, use <see cref="CreateManagedEntity(Entity)"/>.
+    /// </remarks>
+    /// <returns>The created ManagedEntity.</returns>
+    public ManagedEntity CreateManagedEntity()
+    {
+        var id = _scriptComponents.Add(new(8), out var generation);
+        var managedEntity = new ManagedEntity
+        {
+            id = id,
+            generation = generation
+        };
+
+        return managedEntity;
+    }
+
+    /// <summary>
+    /// Destroys the given ManagedEntity and calls OnDestroy on all associated ScriptComponents.
+    /// </summary>
+    /// <param name="managedEntity">The ManagedEntity to destroy.</param>
+    public void DestroyManagedEntity(ManagedEntity managedEntity)
+    {
+        if (_scriptComponents.TryGetElement(managedEntity.id, managedEntity.generation, out var scripts))
+        {
+            foreach (var script in scripts)
+            {
+                script.OnDestroy();
+            }
+
+            _scriptComponents.Remove(managedEntity.id, managedEntity.generation);
+        }
+    }
+
+    /// <summary>
+    /// Checks if the given ManagedEntity exists.
+    /// </summary>
+    /// <param name="managedEntity">The ManagedEntity to check.</param>
+    /// <returns>True if the ManagedEntity exists, false otherwise.</returns>
+    public bool Exists(ManagedEntity managedEntity)
+    {
+        return _scriptComponents.Contains(managedEntity.id, managedEntity.generation);
+    }
+
+    /// <summary>
+    /// Adds a ScriptComponent of type T to the given ManagedEntity and Entity.
+    /// </summary>
+    /// <typeparam name="T">The type of ScriptComponent to add.</typeparam>
+    /// <param name="managedEntity">The ManagedEntity to add the ScriptComponent to.</
+    /// <param name="entity">The Entity associated with the ManagedEntity.</param>
+    public void AddScriptComponent<T>(ManagedEntity managedEntity, Entity entity)
+        where T : ScriptComponent, new()
+    {
+        if (_scriptComponents.TryGetElement(managedEntity.id, managedEntity.generation, out var scripts))
+        {
+            var script = new T
+            {
+                _world = _world,
+                _entity = entity,
+                _managedEntity = managedEntity
+            };
+
+            scripts.Add(script);
+            script.OnCreate();
+
+            return;
+        }
+
+        throw new InvalidOperationException($"ManagedEntity {managedEntity} does not exist.");
+    }
+
+    /// <summary>
+    /// Adds a ScriptComponent of type T to the given Entity.
+    /// </summary>
+    /// <typeparam name="T">The type of ScriptComponent to add.</typeparam>
+    /// <param name="entity">The Entity to add the ScriptComponent to.</param>
+    public unsafe void AddScriptComponent<T>(Entity entity)
+        where T : ScriptComponent, new()
+    {
+        var location = _entityLocations.GetElementAt(entity.ID, entity.Generation);
+        ref var archetype = ref _world.GetArchetypeReference(location.archetypeID);
+
+        var pManagedEntityRef = (ManagedEntityRef*)archetype.GetComponentData(location.chunkIndex, location.rowIndex, ComponentTypeID<ManagedEntityRef>.value);
+        if (pManagedEntityRef == null)
+        {
+            throw new InvalidOperationException($"Entity {entity} does not have ManagedEntityRef component.");
+        }
+
+        AddScriptComponent<T>(pManagedEntityRef->entity, entity);
+    }
+
+    /// <summary>
+    /// Destroys the ScriptComponent of type T associated with the given ManagedEntity.
+    /// </summary>
+    /// <typeparam name="T">The type of ScriptComponent to destroy.</typeparam>
+    /// <param name="managedEntity">The ManagedEntity whose ScriptComponent is to be destroyed </param>
+    /// <returns>True if the ScriptComponent was found and destroyed, false otherwise.</returns
+    public bool DestroyScriptComponent<T>(ManagedEntity managedEntity)
+        where T : ScriptComponent
+    {
+        if (_scriptComponents.TryGetElement(managedEntity.id, managedEntity.generation, out var scripts))
+        {
+            for (var i = 0; i < scripts.Count; i++)
+            {
+                if (scripts[i] is T script)
+                {
+                    script.OnDestroy();
+                    scripts.RemoveAndSwapBack(i);
+                    return true;
+                }
+            }
+
+            return false;
+        }
+
+        throw new InvalidOperationException($"ManagedEntity {managedEntity} does not exist.");
+    }
+
+    /// <summary>
+    /// Checks if the given ManagedEntity has a ScriptComponent of type T.
+    /// </summary>
+    /// <typeparam name="T">The type of ScriptComponent to check for.</typeparam>
+    /// <param name="managedEntity">The ManagedEntity to check.</param>
+    /// <returns>True if the ManagedEntity has a ScriptComponent of type T, false </returns>
+    public bool HasScriptComponent<T>(ManagedEntity managedEntity)
+        where T : ScriptComponent
+    {
+        if (_scriptComponents.TryGetElement(managedEntity.id, managedEntity.generation, out var scripts))
+        {
+            foreach (var script in scripts)
+            {
+                if (script is T)
+                {
+                    return true;
+                }
+            }
+
+            return false;
+        }
+
+        throw new InvalidOperationException($"ManagedEntity {managedEntity} does not exist.");
+    }
+
+    /// <summary>
+    /// Gets the ScriptComponent of type T associated with the given ManagedEntity.
+    /// </summary>
+    /// <typeparam name="T">The type of ScriptComponent to get.</typeparam>
+    /// <param name="managedEntity">The ManagedEntity whose ScriptComponent is to be retrieved
+    /// <returns>The ScriptComponent of type T.</returns>
+    public T GetScriptComponent<T>(ManagedEntity managedEntity)
+        where T : ScriptComponent
+    {
+        if (_scriptComponents.TryGetElement(managedEntity.id, managedEntity.generation, out var scripts))
+        {
+            foreach (var script in scripts)
+            {
+                if (script is T typedScript)
+                {
+                    return typedScript;
+                }
+            }
+
+            throw new InvalidOperationException($"ManagedEntity {managedEntity} does not have script component of type {typeof(T)}.");
+        }
+
+        throw new InvalidOperationException($"ManagedEntity {managedEntity} does not exist.");
+    }
+
+    /// <summary>
+    /// Gets all ScriptComponents of type T associated with the given ManagedEntity.
+    /// </summary>
+    /// <typeparam name="T">The type of ScriptComponent to get.</typeparam>
+    /// <param name="managedEntity">The ManagedEntity whose ScriptComponents are to be retrieved
+    /// <returns>The list of ScriptComponents of type T.</returns>
+    public List<T> GetScriptComponents<T>(ManagedEntity managedEntity)
+        where T : ScriptComponent
+    {
+        if (_scriptComponents.TryGetElement(managedEntity.id, managedEntity.generation, out var scripts))
+        {
+            var result = new List<T>();
+            foreach (var script in scripts)
+            {
+                if (script is T typedScript)
+                {
+                    result.Add(typedScript);
+                }
+            }
+
+            return result;
+        }
+
+        throw new InvalidOperationException($"ManagedEntity {managedEntity} does not exist.");
+    }
+}

Ghost.Entities/EntityQuery.JobChunk.cs

@@ -0,0 +1,87 @@
+using Ghost.Core;
+using Misaki.HighPerformance.Jobs;
+using Misaki.HighPerformance.LowLevel.Collections;
+using System.Runtime.CompilerServices;
+
+namespace Ghost.Entities;
+
+public interface IJobChunk
+{
+    void Execute(ChunkView view, int threadIndex);
+}
+
+internal unsafe struct ChunkInfo
+{
+    public Chunk* pChunk;
+    public Archetype* pArchetype;
+}
+
+internal unsafe struct JobChunkBatch<TJob> : IJobParallelFor
+    where TJob : unmanaged, IJobChunk
+{
+
+    public TJob userJob;
+    public ReadOnlyUnsafeCollection<ChunkInfo> chunkInfos;
+
+    public void Execute(int loopIndex, int threadIndex)
+    {
+        var info = chunkInfos[loopIndex];
+        var view = new ChunkView(in *info.pArchetype, in *info.pChunk);
+
+        userJob.Execute(view, threadIndex);
+    }
+}
+
+internal struct DisposeJobChunk : IJob
+{
+    public UnsafeList<ChunkInfo> list;
+
+    public void Execute(int threadIndex)
+    {
+        list.Dispose();
+    }
+}
+
+public unsafe partial struct EntityQuery
+{
+    public JobHandle ScheduleChunkParallel<TJob>(TJob job, int batchSize, JobHandle dependency)
+        where TJob : unmanaged, IJobChunk
+    {
+        var world = World.GetWorld(_worldID).GetValueOrThrow();
+
+        var chunkInfos = new UnsafeList<ChunkInfo>(_matchingArchetypes.Count * 2, JobScheduler.TempAllocatorHandle);
+
+        foreach (var archID in _matchingArchetypes)
+        {
+            ref var arch = ref world.GetArchetypeReference(archID);
+
+            for (int i = 0; i < arch.ChunkCount; i++)
+            {
+                var pChunk = (Chunk*)arch._chunks.GetUnsafePtr() + i;
+
+                chunkInfos.Add(new ChunkInfo
+                {
+                    pArchetype = (Archetype*)Unsafe.AsPointer(ref arch),
+                    pChunk = pChunk
+                });
+            }
+        }
+
+        var batchJob = new JobChunkBatch<TJob>
+        {
+            userJob = job,
+            chunkInfos = chunkInfos.AsReadOnly()
+        };
+
+        var handle = world.JobScheduler.ScheduleParallel(ref batchJob, chunkInfos.Count, batchSize, dependency);
+
+        var disposeJob = new DisposeJobChunk
+        {
+            list = chunkInfos
+        };
+
+        world.JobScheduler.Schedule(ref disposeJob, handle);
+
+        return handle;
+    }
+}

Ghost.Entities/Ghost.Entities.csproj

@@ -1,4 +1,4 @@
-<Project Sdk="Microsoft.NET.Sdk">
+<Project Sdk="Microsoft.NET.Sdk">
 
   <PropertyGroup>
     <TargetFramework>net10.0</TargetFramework>
@@ -8,60 +8,57 @@
   </PropertyGroup>
 
   <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Debug|AnyCPU'">
-    <IsAotCompatible>True</IsAotCompatible>
+    <IsAotCompatible>False</IsAotCompatible>
+    <IsTrimmable>False</IsTrimmable>
   </PropertyGroup>
 
   <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Release|AnyCPU'">
     <IsAotCompatible>True</IsAotCompatible>
+    <IsTrimmable>True</IsTrimmable>
   </PropertyGroup>
 
   <ItemGroup>
-    <None Include="Template\ForEach.cs">
+    <Compile Remove="Templates\ForEach.cs" />
+  </ItemGroup>
+
+  <ItemGroup>
+    <None Include="Templates\EntityQuery.ForEach.gen.cs">
       <DesignTime>True</DesignTime>
       <AutoGen>True</AutoGen>
+      <DependentUpon>EntityQuery.ForEach.tt</DependentUpon>
+    </None>
+    <None Include="Templates\ForEach.gen.cs">
       <DependentUpon>ForEach.tt</DependentUpon>
-    </None>
-    <None Include="Template\QueryItem.cs">
       <DesignTime>True</DesignTime>
       <AutoGen>True</AutoGen>
-      <DependentUpon>QueryItem.tt</DependentUpon>
     </None>
-    <None Include="Template\QueryRefComponent.cs">
+    <None Include="Templates\QueryBuilder.With.gen.cs">
       <DesignTime>True</DesignTime>
       <AutoGen>True</AutoGen>
-      <DependentUpon>QueryRefComponent.tt</DependentUpon>
-    </None>
-    <None Include="Template\World.Query.cs">
-      <DesignTime>True</DesignTime>
-      <AutoGen>True</AutoGen>
-      <DependentUpon>World.Query.tt</DependentUpon>
+      <DependentUpon>QueryBuilder.With.tt</DependentUpon>
     </None>
   </ItemGroup>
 
   <ItemGroup>
-    <None Update="Template\ForEach.tt">
+    <ProjectReference Include="..\Ghost.Core\Ghost.Core.csproj" />
+  </ItemGroup>
+
+  <ItemGroup>
+    <None Update="Templates\EntityQuery.ForEach.tt">
       <Generator>TextTemplatingFileGenerator</Generator>
-      <LastGenOutput>ForEach.cs</LastGenOutput>
+      <LastGenOutput>EntityQuery.ForEach.gen.cs</LastGenOutput>
     </None>
-    <None Update="Template\QueryEnumerable.tt">
+    <None Update="Templates\ForEach.tt">
+      <LastGenOutput>ForEach.gen.cs</LastGenOutput>
       <Generator>TextTemplatingFileGenerator</Generator>
-      <LastGenOutput>QueryEnumerable.cs</LastGenOutput>
     </None>
-    <None Update="Template\Helpers.tt">
-      <Generator>TextTemplatingFilePreprocessor</Generator>
-      <LastGenOutput>Helpers.cs</LastGenOutput>
-    </None>
-    <None Update="Template\QueryItem.tt">
+    <None Update="Templates\EntityQuery.JobEntityParallel.tt">
       <Generator>TextTemplatingFileGenerator</Generator>
-      <LastGenOutput>QueryItem.cs</LastGenOutput>
+      <LastGenOutput>EntityQuery.JobEntityParallel.gen.cs</LastGenOutput>
     </None>
-    <None Update="Template\QueryRefComponent.tt">
+    <None Update="Templates\QueryBuilder.With.tt">
       <Generator>TextTemplatingFileGenerator</Generator>
-      <LastGenOutput>QueryRefComponent.cs</LastGenOutput>
-    </None>
-    <None Update="Template\World.Query.tt">
-      <Generator>TextTemplatingFileGenerator</Generator>
-      <LastGenOutput>World.Query.cs</LastGenOutput>
+      <LastGenOutput>QueryBuilder.With.gen.cs</LastGenOutput>
     </None>
   </ItemGroup>
 
@@ -70,44 +67,26 @@
   </ItemGroup>
 
   <ItemGroup>
-    <Compile Update="Template\ForEach.cs">
+    <Compile Update="Templates\EntityQuery.ForEach.gen.cs">
+      <DesignTime>True</DesignTime>
+      <AutoGen>True</AutoGen>
+      <DependentUpon>EntityQuery.ForEach.tt</DependentUpon>
+    </Compile>
+    <Compile Update="Templates\EntityQuery.JobEntityParallel.gen.cs">
+      <DesignTime>True</DesignTime>
+      <AutoGen>True</AutoGen>
+      <DependentUpon>EntityQuery.JobEntityParallel.tt</DependentUpon>
+    </Compile>
+    <Compile Update="Templates\ForEach.gen.cs">
       <DesignTime>True</DesignTime>
       <AutoGen>True</AutoGen>
       <DependentUpon>ForEach.tt</DependentUpon>
     </Compile>
-    <Compile Update="Template\Helpers.cs">
+    <Compile Update="Templates\QueryBuilder.With.gen.cs">
       <DesignTime>True</DesignTime>
       <AutoGen>True</AutoGen>
-      <DependentUpon>Helpers.tt</DependentUpon>
+      <DependentUpon>QueryBuilder.With.tt</DependentUpon>
     </Compile>
-    <Compile Update="Template\QueryEnumerable.cs">
-      <DesignTime>True</DesignTime>
-      <AutoGen>True</AutoGen>
-      <DependentUpon>QueryEnumerable.tt</DependentUpon>
-    </Compile>
-    <Compile Update="Template\QueryItem.cs">
-      <DesignTime>True</DesignTime>
-      <AutoGen>True</AutoGen>
-      <DependentUpon>QueryItem.tt</DependentUpon>
-    </Compile>
-    <Compile Update="Template\QueryRefComponent.cs">
-      <DesignTime>True</DesignTime>
-      <AutoGen>True</AutoGen>
-      <DependentUpon>QueryRefComponent.tt</DependentUpon>
-    </Compile>
-    <Compile Update="Template\World.Query.cs">
-      <DesignTime>True</DesignTime>
-      <AutoGen>True</AutoGen>
-      <DependentUpon>World.Query.tt</DependentUpon>
-    </Compile>
-  </ItemGroup>
-
-  <ItemGroup>
-    <Folder Include="Helpers\" />
-  </ItemGroup>
-
-  <ItemGroup>
-    <ProjectReference Include="..\Ghost.Core\Ghost.Core.csproj" />
   </ItemGroup>
 
 </Project>

Ghost.Entities/ManagedComponent.cs

@@ -0,0 +1,256 @@
+#if false
+using Ghost.Core;
+using Misaki.HighPerformance.Collections;
+using System.Runtime.CompilerServices;
+
+namespace Ghost.Entities;
+
+public interface IManagedComponent;
+public interface IManagedWrapper;
+
+public readonly struct Managed<T> : IComponent, IManagedWrapper
+    where T : IManagedComponent
+{
+    public readonly int id;
+    public readonly int generation;
+
+    internal Managed(int id, int generation)
+    {
+        this.id = id;
+        this.generation = generation;
+    }
+}
+
+public static class ManagedComponemtnID<T>
+    where T : IManagedComponent
+{
+    public static readonly Identifier<IManagedComponent> value = ManagedComponentRegister.GetOrRegisterComponent<T>();
+}
+
+internal struct ManagedComponentInfo
+{
+    public int id;
+    public bool isScriptComponent;
+}
+
+internal static class ManagedComponentRegister
+{
+    private static readonly List<ManagedComponentInfo> s_registeredComponents = new();
+    private static readonly Dictionary<IntPtr, int> s_typeHandleToID = new();
+    private static readonly Dictionary<string, int> s_nameToRuntimeID = new();
+#if DEBUG || GHOST_EDITOR
+    internal static readonly Dictionary<int, Type> s_runtimeIDToType = new();
+#endif
+
+    public static Identifier<IManagedComponent> GetOrRegisterComponent<T>()
+        where T : IManagedComponent
+    {
+        var typeHandle = typeof(T).TypeHandle.Value;
+
+        lock (s_registeredComponents)
+        {
+            if (s_typeHandleToID.TryGetValue(typeHandle, out var existingID))
+            {
+                return existingID;
+            }
+
+            var newID = new Identifier<IManagedComponent>(s_registeredComponents.Count);
+            var stableName = typeof(T).FullName ?? typeof(T).Name;
+            var info = new ManagedComponentInfo
+            {
+                id = newID,
+                isScriptComponent = typeof(ScriptComponent).IsAssignableFrom(typeof(T)),
+            };
+
+            s_registeredComponents.Add(info);
+
+            s_typeHandleToID[typeHandle] = newID;
+            s_nameToRuntimeID[stableName] = newID;
+#if DEBUG || GHOST_EDITOR
+            s_runtimeIDToType[newID.value] = typeof(T);
+#endif
+
+            return newID;
+        }
+    }
+
+    [MethodImpl(MethodImplOptions.AggressiveInlining)]
+    public static Identifier<IManagedComponent> GetComponentID(Type type)
+    {
+        var typeHandle = type.TypeHandle.Value;
+        lock (s_registeredComponents)
+        {
+            if (s_typeHandleToID.TryGetValue(typeHandle, out var existingID))
+            {
+                return existingID;
+            }
+        }
+
+        return Identifier<IManagedComponent>.Invalid;
+    }
+
+    [MethodImpl(MethodImplOptions.AggressiveInlining)]
+    public static ManagedComponentInfo GetComponentInfo(Identifier<IManagedComponent> typeId)
+    {
+        lock (s_registeredComponents)
+        {
+            return s_registeredComponents[typeId];
+        }
+    }
+}
+
+internal interface IManagedComponentStorage
+{
+    public Identifier<IManagedComponent> TypeID { get; }
+}
+
+internal class ManagedComponentStorage<T> : IManagedComponentStorage
+    where T : IManagedComponent
+{
+    private readonly SlotMap<T> _storage = new(16);
+
+    public Identifier<IManagedComponent> TypeID => ManagedComponemtnID<T>.value;
+
+    public Managed<T> Add(T component)
+    {
+        var id = _storage.Add(component, out var generation);
+        return new Managed<T>(id, generation);
+    }
+
+    public void Remove(Managed<T> managed)
+    {
+        _storage.Remove(managed.id, managed.generation);
+    }
+
+    public ref T GetComponentReference(Managed<T> managed)
+    {
+        return ref _storage.GetElementReferenceAt(managed.id, managed.generation, out _);
+    }
+}
+
+public abstract class ScriptComponent : IManagedComponent
+{
+    internal World _world = null!;
+    internal Entity _entity;
+
+    public World World => _world;
+    public Entity Entity => _entity;
+
+    protected ref T GetComponent<T>()
+        where T : unmanaged, IComponent
+    {
+        return ref _world.EntityManager.GetComponent<T>(_entity);
+    }
+
+    public virtual void OnCreate()
+    {
+    }
+
+    public virtual void OnDestroy()
+    {
+    }
+
+    public virtual void OnEnable()
+    {
+    }
+
+    public virtual void OnDisable()
+    {
+    }
+
+    public virtual void Start()
+    {
+    }
+
+    public virtual void Update()
+    {
+    }
+
+    public virtual void FixedUpdate()
+    {
+    }
+
+    public virtual void LateUpdate()
+    {
+    }
+}
+
+public partial class EntityManager
+{
+    private IManagedComponentStorage[] _storages;
+
+    internal IManagedComponentStorage[] Storages => _storages;
+
+    private ManagedComponentStorage<T> GetOrCreateManagedComponentStorage<T>()
+        where T : IManagedComponent
+    {
+        var id = ManagedComponemtnID<T>.value;
+        if (_storages == null || _storages.Length <= id.value)
+        {
+            Array.Resize(ref _storages, id.value + 1);
+        }
+
+        ref var storage = ref _storages[id.value];
+        storage ??= new ManagedComponentStorage<T>();
+
+        return (ManagedComponentStorage<T>)storage;
+    }
+
+    public Managed<T> AddManagedComponent<T>(Entity entity)
+        where T : IManagedComponent, new()
+    {
+        var instance = new T();
+        if (instance is ScriptComponent scriptComponent)
+        {
+            scriptComponent._world = _world;
+            scriptComponent._entity = entity;
+            scriptComponent.OnCreate();
+        }
+
+        var managed = GetOrCreateManagedComponentStorage<T>().Add(instance);
+        AddComponent(entity, managed);
+
+        return managed;
+    }
+
+    public bool RemoveManagedComponent<T>(Entity entity)
+        where T : IManagedComponent
+    {
+        ref var component = ref GetComponent<Managed<T>>(entity);
+        if (!Unsafe.IsNullRef(ref component))
+        {
+            var storage = GetOrCreateManagedComponentStorage<T>();
+            var componentRef = storage.GetComponentReference(component);
+            if (componentRef is ScriptComponent scriptComponent)
+            {
+                scriptComponent.OnDestroy();
+            }
+
+            RemoveComponent<Managed<T>>(entity);
+            storage.Remove(component);
+
+            return true;
+        }
+
+        return false;
+    }
+
+    public ref T GetManagedComponent<T>(Entity entity)
+        where T : IManagedComponent
+    {
+        ref var component = ref GetComponent<Managed<T>>(entity);
+        if (Unsafe.IsNullRef(ref component))
+        {
+            return ref Unsafe.NullRef<T>();
+        }
+
+        return ref GetOrCreateManagedComponentStorage<T>().GetComponentReference(component);
+    }
+
+    public ref T GetManagedComponent<T>(Managed<T> managedComponent)
+        where T : IManagedComponent
+    {
+        return ref GetOrCreateManagedComponentStorage<T>().GetComponentReference(managedComponent);
+    }
+}
+#endif

Ghost.Entities/ManagedEntity.cs

@@ -0,0 +1,69 @@
+using System.Runtime.CompilerServices;
+
+namespace Ghost.Entities;
+
+public record struct ManagedEntity
+{
+    public int id;
+    public int generation;
+}
+
+public struct ManagedEntityRef : IComponent
+{
+    public ManagedEntity entity;
+}
+
+public abstract class ScriptComponent
+{
+    internal World _world = null!;
+    internal Entity _entity;
+    internal ManagedEntity _managedEntity;
+
+    public World World => _world;
+    public Entity Entity => _entity;
+    public ManagedEntity ManagedEntity => _managedEntity;
+
+    protected ref T GetComponent<T>()
+        where T : unmanaged, IComponent
+    {
+        ref var value = ref _world.EntityManager.GetComponent<T>(_entity);
+        if (Unsafe.IsNullRef(ref value))
+        {
+            throw new InvalidOperationException($"Entity {_entity} does not have component of type {typeof(T)}");
+        }
+
+        return ref value;
+    }
+
+    public virtual void OnCreate()
+    {
+    }
+
+    public virtual void OnDestroy()
+    {
+    }
+
+    public virtual void OnEnable()
+    {
+    }
+
+    public virtual void OnDisable()
+    {
+    }
+
+    public virtual void Start()
+    {
+    }
+
+    public virtual void Update()
+    {
+    }
+
+    public virtual void FixedUpdate()
+    {
+    }
+
+    public virtual void LateUpdate()
+    {
+    }
+}

Ghost.Entities/Query.cs

@@ -0,0 +1,604 @@
+using Ghost.Core;
+using Misaki.HighPerformance.LowLevel.Buffer;
+using Misaki.HighPerformance.LowLevel.Collections;
+using System.Runtime.CompilerServices;
+
+namespace Ghost.Entities;
+
+internal struct EntityQueryMask : IDisposable, IEquatable<EntityQueryMask>
+{
+    public UnsafeBitSet structuralAll;
+    public UnsafeBitSet structuralAny;
+    public UnsafeBitSet structuralAbsent;
+
+    public UnsafeBitSet requireEnabled;
+    public UnsafeBitSet requireDisabled;
+    public UnsafeBitSet rejectIfEnabled;
+
+    public UnsafeBitSet writeAccess;
+
+    [MethodImpl(MethodImplOptions.AggressiveInlining)]
+    public readonly bool Matches(ref readonly UnsafeBitSet archetypeSignature)
+    {
+        return (!structuralAll.IsCreated || structuralAll.All(archetypeSignature))
+            && (!structuralAbsent.IsCreated || structuralAbsent.None(archetypeSignature))
+            && (!structuralAny.IsCreated || structuralAny.Count == 0 || structuralAny.Any(archetypeSignature));
+    }
+
+    [MethodImpl(MethodImplOptions.AggressiveInlining)]
+    public override readonly int GetHashCode()
+    {
+        var hash = 17;
+        if (structuralAll.IsCreated) hash = hash * 23 + structuralAll.GetHashCode();
+        if (structuralAbsent.IsCreated) hash = hash * 23 + structuralAbsent.GetHashCode();
+        if (structuralAny.IsCreated) hash = hash * 23 + structuralAny.GetHashCode();
+        if (requireEnabled.IsCreated) hash = hash * 23 + requireEnabled.GetHashCode();
+        if (requireDisabled.IsCreated) hash = hash * 23 + requireDisabled.GetHashCode();
+        if (rejectIfEnabled.IsCreated) hash = hash * 23 + rejectIfEnabled.GetHashCode();
+        if (writeAccess.IsCreated) hash = hash * 23 + writeAccess.GetHashCode();
+
+        return hash;
+    }
+
+    public readonly bool Equals(EntityQueryMask other)
+    {
+        return structuralAll.Equals(other.structuralAll)
+            && structuralAny.Equals(other.structuralAny)
+            && structuralAbsent.Equals(other.structuralAbsent)
+            && requireEnabled.Equals(other.requireEnabled)
+            && requireDisabled.Equals(other.requireDisabled)
+            && rejectIfEnabled.Equals(other.rejectIfEnabled)
+            && writeAccess.Equals(other.writeAccess);
+    }
+
+    public override readonly bool Equals(object? obj)
+    {
+        return obj is EntityQueryMask mask && Equals(mask);
+    }
+
+    public static bool operator ==(EntityQueryMask left, EntityQueryMask right)
+    {
+        return left.Equals(right);
+    }
+
+    public static bool operator !=(EntityQueryMask left, EntityQueryMask right)
+    {
+        return !(left == right);
+    }
+
+    public void Dispose()
+    {
+        structuralAll.Dispose();
+        structuralAny.Dispose();
+        structuralAbsent.Dispose();
+
+        requireEnabled.Dispose();
+        requireDisabled.Dispose();
+        rejectIfEnabled.Dispose();
+
+        writeAccess.Dispose();
+    }
+}
+
+/// <summary>
+/// Provides a read-only view over a chunk of entities and their component data within an archetype.
+/// </summary>
+/// <remarks>This does not filter disabled/enabled components. You must handle that manually.</remarks>
+public readonly unsafe ref struct ChunkView
+{
+    // We flatten all the information we need for fast access.
+    private readonly ReadOnlyUnsafeCollection<Archetype.ComponentMemoryLayout> _layouts;
+    private readonly byte* _pChunkData;
+    private readonly int* _pVersion;
+    private readonly int _entityOffset;
+    private readonly int _entityCount;
+    private readonly int _structuralVersion;
+    private readonly int _currentVersion;
+
+    public readonly int Count => _entityCount;
+
+    internal ChunkView(ref readonly Archetype archetype, ref readonly Chunk chunk)
+    {
+        _layouts = archetype._layouts.AsReadOnly();
+        _pChunkData = chunk.GetUnsafePtr();
+        _entityOffset = archetype.EntityIDsOffset;
+        _entityCount = chunk._count;
+        _pVersion = chunk.GetVersionUnsafePtr();
+
+        _structuralVersion = chunk._structuralVersion;
+        _currentVersion = World.GetWorldUncheck(archetype.WorldID).Version;
+    }
+
+    [MethodImpl(MethodImplOptions.AggressiveInlining)]
+    private Archetype.ComponentMemoryLayout GetLayout(Identifier<IComponent> id)
+    {
+        var layout = _layouts[id.value];
+        if (layout.enableBitsOffset == -1)
+        {
+            throw new InvalidOperationException($"Component {id} is not exist in the archetype.");
+        }
+
+        return layout;
+    }
+
+    /// <summary>
+    /// Determines whether the specified component has changed since the given version.
+    /// </summary>
+    /// <param name="id">The identifier of the component to check for changes.</param>
+    /// <param name="version">The version number to compare against the component's current version. Must be greater than or equal to zero.</param>
+    /// <returns>true if the component's current version is less than or equal to the specified version; otherwise, false.</returns>
+    [MethodImpl(MethodImplOptions.AggressiveInlining)]
+    public bool HasChanged(Identifier<IComponent> id, int version)
+    {
+        var layout = GetLayout(id);
+        return version < _pVersion[layout.versionIndex];
+    }
+
+    /// <summary>
+    /// Determines whether the specified version indicates that the component of type <typeparamref name="T"/> has
+    /// changed since the last recorded version.
+    /// </summary>
+    /// <typeparam name="T">The type of component to check for changes. Must be an unmanaged type that implements <see cref="IComponent"/>.</typeparam>
+    /// <param name="version">The version number to compare against the current version of the component.</param>
+    /// <returns>true if the component of type T has changed since the specified version; otherwise, false.</returns>
+    [MethodImpl(MethodImplOptions.AggressiveInlining)]
+    public readonly bool HasChanged<T>(int version)
+        where T : unmanaged, IComponent
+    {
+        var layout = GetLayout(ComponentTypeID<T>.value);
+        return version < _pVersion[layout.versionIndex];
+    }
+
+    /// <summary>
+    /// Determines whether the chunk's structure has changed since the specified version.
+    /// </summary>
+    /// <param name="version">The version number to compare against the chunk's structural version.</param>
+    /// <returns>true if the chunk's structure has changed since the specified version; otherwise, false.</returns>
+    [MethodImpl(MethodImplOptions.AggressiveInlining)]
+    public readonly bool HasStructuralChanged(int version)
+    {
+        return version < _structuralVersion;
+    }
+
+    /// <summary>
+    /// Gets the current version number associated with the specified component identifier.
+    /// </summary>
+    /// <param name="id">The identifier of the component for which to retrieve the version number. Must reference a valid component.</param>
+    /// <returns>The version number of the specified component.</returns>
+    [MethodImpl(MethodImplOptions.AggressiveInlining)]
+    public readonly int GetComponentVersion(Identifier<IComponent> id)
+    {
+        return _pVersion[id];
+    }
+
+    /// <summary>
+    /// Gets the current version number associated with the specified component type.
+    /// </summary>
+    /// <typeparam name="T">The component type for which to retrieve the version. Must be an unmanaged type that implements <see cref="IComponent"/>.</typeparam>
+    /// <returns>The version number of the component type <typeparamref name="T"/>.</returns>
+    [MethodImpl(MethodImplOptions.AggressiveInlining)]
+    public readonly int GetComponentVersion<T>()
+        where T : unmanaged, IComponent
+    {
+        return _pVersion[ComponentTypeID<T>.value];
+    }
+
+    /// <summary>
+    /// Returns a read-only span containing structuralAll entities stored in the current chunk.
+    /// </summary>
+    /// <returns>A read-only span of <see cref="Entity"/> values representing the entities in the chunk.</returns>
+    [MethodImpl(MethodImplOptions.AggressiveInlining)]
+    public ReadOnlySpan<Entity> GetEntities()
+    {
+        var pEntity = (Entity*)(_pChunkData + _entityOffset);
+        return new ReadOnlySpan<Entity>(pEntity, _entityCount);
+    }
+
+    /// <summary>
+    /// Gets a readonly span providing direct access to the component data of type T0 for structuralAll entities in the chunk.
+    /// </summary>
+    /// <typeparam name="T">The type of component to access. Must be an unmanaged type that implements <see cref="Component"/>.</typeparam>
+    /// <returns>A readonly span of type <see cref="{T}"/> containing the component data for each entity in the chunk.</returns>
+    /// <exception cref="InvalidOperationException">Thrown if the specified component type is not present in the archetype.</exception>
+    [MethodImpl(MethodImplOptions.AggressiveInlining)]
+    public ReadOnlySpan<T> GetComponentData<T>()
+        where T : unmanaged, IComponent
+    {
+        var layout = GetLayout(ComponentTypeID<T>.value);
+        var pComponentData = _pChunkData + layout.offset;
+        return new ReadOnlySpan<T>(pComponentData, _entityCount);
+    }
+
+    /// <summary>
+    /// Gets a span providing direct access to the component data of type T0 for structuralAll entities in the chunk.
+    /// </summary>
+    /// <typeparam name="T">The type of component to access. Must be an unmanaged type that implements <see cref="Component"/>.</typeparam>
+    /// <returns>A span of type <see cref="{T}"/> containing the component data for each entity in the chunk.</returns>
+    /// <exception cref="InvalidOperationException">Thrown if the specified component type is not present in the archetype.</exception>
+    [MethodImpl(MethodImplOptions.AggressiveInlining)]
+    public Span<T> GetComponentDataRW<T>()
+        where T : unmanaged, IComponent
+    {
+        var compId = ComponentTypeID<T>.value;
+        var layout = GetLayout(compId);
+
+        _pVersion[layout.versionIndex] = _currentVersion;
+
+        var pComponentData = _pChunkData + layout.offset;
+        return new Span<T>(pComponentData, _entityCount);
+    }
+
+    /// <summary>
+    /// Gets a bit set representing the enabled state of each instance of the specified enableable component
+    /// type within the current chunk.
+    /// </summary>
+    /// <typeparam name="T">The component type for which to retrieve enablement bits. Must be unmanaged and implement <see cref="IEnableableComponent"/>.</typeparam>
+    /// <returns>A <see cref="SpanBitSet"/> that provides access to the enablement bits for all instances of the specified component type in the chunk.</returns>
+    /// <exception cref="InvalidOperationException">Thrown if the specified component type does not support enablement.</exception>
+    [MethodImpl(MethodImplOptions.AggressiveInlining)]
+    public SpanBitSet GetEnableBits<T>()
+        where T : unmanaged, IEnableableComponent
+    {
+        var layout = _layouts[ComponentTypeID<T>.value];
+        var maskBase = _pChunkData + layout.enableBitsOffset;
+        return new SpanBitSet(new Span<uint>(maskBase, (_entityCount + 31) / 32));
+    }
+
+    /// <summary>
+    /// Determines whether the specified component of type <typeparamref name="T"/> at the given index is currently enabled.
+    /// </summary>
+    /// <typeparam name="T">The type of the component to check. Must be an unmanaged type that implements <see cref="IEnableableComponent"/>.</typeparam>
+    /// <param name="index">The zero-based index of the component instance to check within the chunk.</param>
+    /// <returns>true if the component at the specified index is enabled; otherwise, false.</returns>
+    /// <exception cref="InvalidOperationException">Thrown if the specified component type <typeparamref name="T"/> does not support enable/disable functionality.</exception>
+    [MethodImpl(MethodImplOptions.AggressiveInlining)]
+    public bool IsComponentEnabled<T>(int index)
+        where T : unmanaged, IEnableableComponent
+    {
+        var layout = GetLayout(ComponentTypeID<T>.value);
+        var pMask = _pChunkData + layout.enableBitsOffset;
+        return EntityQuery.CheckBit(pMask, index);
+    }
+}
+
+public unsafe partial struct EntityQuery : IDisposable
+{
+    /// <summary>
+    /// Provides an enumerator for iterating over chunks of entities and their component data that match a set of archetypes within a world.
+    /// </summary>
+    public readonly ref struct ChunkIterator
+    {
+        public ref struct Enumerator
+        {
+            private readonly ChunkIterator _iterator;
+            private int _archetypeIndex;
+            private int _chunkIndex;
+
+            internal Enumerator(ChunkIterator iterator)
+            {
+                _iterator = iterator;
+                _archetypeIndex = 0;
+                _chunkIndex = -1;
+            }
+
+            public readonly ChunkView Current
+            {
+                get
+                {
+                    ref var archetype = ref _iterator._world.GetArchetypeReference(_iterator._matchingArchetypes[_archetypeIndex]);
+                    ref var chunk = ref archetype.GetChunkReference(_chunkIndex);
+                    return new ChunkView(in archetype, in chunk);
+                }
+            }
+
+            public bool MoveNext()
+            {
+                _chunkIndex++;
+
+                while (_archetypeIndex < _iterator._matchingArchetypes.Count)
+                {
+                    ref var archetype = ref _iterator._world.GetArchetypeReference(_iterator._matchingArchetypes[_archetypeIndex]);
+                    if (_chunkIndex < archetype.ChunkCount)
+                    {
+                        return true;
+                    }
+
+                    _chunkIndex = 0;
+                    _archetypeIndex++;
+                }
+
+                return false;
+            }
+
+            public void Reset()
+            {
+                _archetypeIndex = 0;
+                _chunkIndex = -1;
+            }
+        }
+
+        private readonly ReadOnlyUnsafeCollection<Identifier<Archetype>> _matchingArchetypes;
+        private readonly World _world;
+
+        internal ChunkIterator(ReadOnlyUnsafeCollection<Identifier<Archetype>> matchingArchetypes, World world)
+        {
+            _matchingArchetypes = matchingArchetypes;
+            _world = world;
+        }
+
+        public readonly Enumerator GetEnumerator()
+        {
+            return new Enumerator(this);
+        }
+    }
+
+    internal EntityQueryMask _mask;
+
+    private UnsafeList<Identifier<Archetype>> _matchingArchetypes;
+    private readonly Identifier<EntityQuery> _id;
+    private readonly Identifier<World> _worldID;
+
+    internal EntityQuery(Identifier<EntityQuery> id, Identifier<World> worldID, EntityQueryMask mask)
+    {
+        _id = id;
+        _worldID = worldID;
+        _mask = mask;
+        _matchingArchetypes = new UnsafeList<Identifier<Archetype>>(8, Allocator.Persistent);
+    }
+
+    // TODO: Fetching layout every time is not optimal. Cache them?
+    private static bool IsEntityValid(byte* chunkBase, int entityIndex, ref readonly Archetype archetype, ref readonly EntityQueryMask mask)
+    {
+        // 1. Check "Require Enabled" (WithAll)
+        var it = mask.requireEnabled.GetIterator();
+        while (it.Next(out var id))
+        {
+            // Get the EnableBitmask for this component in this chunk
+            var layoutResult = archetype.GetLayout(id);
+            if (layoutResult.Error != ErrorStatus.None
+                // Not enableable, always true
+                || layoutResult.Value.enableBitsOffset == -1)
+            {
+                continue;
+            }
+
+            // Check bit
+            if (!CheckBit(chunkBase + layoutResult.Value.enableBitsOffset, entityIndex))
+            {
+                return false;
+            }
+        }
+
+        // 2. Check "Require Disabled" (WithDisabled)
+        it = mask.requireDisabled.GetIterator();
+        while (it.Next(out var id))
+        {
+            var layoutResult = archetype.GetLayout(id);
+            if (layoutResult.Error != ErrorStatus.None)
+            {
+                continue;
+            }
+
+            // If component is not enableable, it is technically "Always Enabled", 
+            // so it cannot satisfy "WithDisabled".
+
+            // Check bit (Must be 0)
+            if (layoutResult.Value.enableBitsOffset == -1
+                || CheckBit(chunkBase + layoutResult.Value.enableBitsOffset, entityIndex))
+            {
+                return false;
+            }
+        }
+
+        // 3. Check "Reject if Enabled" (The "Soft WithNone")
+        it = mask.rejectIfEnabled.GetIterator();
+        while (it.Next(out var id))
+        {
+            var layoutResult = archetype.GetLayout(id);
+            if (layoutResult.Error != ErrorStatus.None)
+            {
+                continue;
+            }
+
+            // If component is not enableable, it is technically "Always Enabled", 
+            // so it cannot satisfy "Reject if Enabled".
+
+            // Check bit (Must be 0)
+            if (layoutResult.Value.enableBitsOffset == -1
+                || CheckBit(chunkBase + layoutResult.Value.enableBitsOffset, entityIndex))
+            {
+                return false;
+            }
+        }
+
+        return true;
+    }
+
+    [MethodImpl(MethodImplOptions.AggressiveInlining)]
+    internal static bool CheckBit(byte* maskBase, int index)
+    {
+        var byteIndex = index >> Chunk.BIT_SHIFT;
+        var bitIndex = index & Chunk.BIT_ALIGNMENT_MINUS_ONE;
+        return (maskBase[byteIndex] & (1 << bitIndex)) != 0;
+    }
+
+    [MethodImpl(MethodImplOptions.AggressiveInlining)]
+    internal void AddArchetypeIfMatch(ref readonly Archetype archetype)
+    {
+        if (_mask.Matches(in archetype._signature))
+        {
+            _matchingArchetypes.Add(archetype.ID);
+        }
+    }
+
+    [MethodImpl(MethodImplOptions.AggressiveInlining)]
+    public readonly ChunkIterator GetChunkIterator()
+    {
+        var world = World.GetWorld(_worldID).Value;
+        return new ChunkIterator(_matchingArchetypes.AsReadOnly(), world);
+    }
+
+    [MethodImpl(MethodImplOptions.AggressiveInlining)]
+    public readonly int GetEntityCount()
+    {
+        var total = 0;
+        var r = World.GetWorld(_worldID);
+        if (r.IsFailure)
+        {
+            return 0;
+        }
+
+        var world = r.Value;
+        for(var i = 0; i < _matchingArchetypes.Count; i++)
+        {
+            var archetypeID = _matchingArchetypes[i];
+            ref var archetype = ref world.GetArchetypeReference(archetypeID);
+            for (var j = 0; j < archetype.ChunkCount; j++)
+            {
+                ref var chunk = ref archetype.GetChunkReference(j);
+                total += chunk._count;
+            }
+        }
+
+        return total;
+    }
+
+    public void Dispose()
+    {
+        _mask.Dispose();
+        _matchingArchetypes.Dispose();
+    }
+}
+
+public ref partial struct QueryBuilder
+{
+    private readonly Stack.Scope _scope;
+
+    private UnsafeList<Identifier<IComponent>> _all;
+    private UnsafeList<Identifier<IComponent>> _any;
+    private UnsafeList<Identifier<IComponent>> _absent;
+    private UnsafeList<Identifier<IComponent>> _none;
+    private UnsafeList<Identifier<IComponent>> _disabled;
+    private UnsafeList<Identifier<IComponent>> _present;
+
+    private UnsafeList<Identifier<IComponent>> _rw;
+
+    public QueryBuilder()
+    {
+        _scope = AllocationManager.CreateStackScope();
+
+        _all = new UnsafeList<Identifier<IComponent>>(4, _scope.AllocationHandle);
+        _any = new UnsafeList<Identifier<IComponent>>(4, _scope.AllocationHandle);
+        _absent = new UnsafeList<Identifier<IComponent>>(4, _scope.AllocationHandle);
+        _none = new UnsafeList<Identifier<IComponent>>(4, _scope.AllocationHandle);
+        _disabled = new UnsafeList<Identifier<IComponent>>(4, _scope.AllocationHandle);
+        _present = new UnsafeList<Identifier<IComponent>>(4, _scope.AllocationHandle);
+
+        _rw = new UnsafeList<Identifier<IComponent>>(4, _scope.AllocationHandle);
+    }
+
+    [MethodImpl(MethodImplOptions.AggressiveInlining)]
+    private static void FindMax(UnsafeList<Identifier<IComponent>> list, ref int max)
+    {
+        foreach (var id in list)
+        {
+            if (id.value > max) max = id.value;
+        }
+    }
+
+    public Identifier<EntityQuery> Build(World world, Allocator allocator = Allocator.Persistent)
+    {
+        // 1. Calculate max component ID to size the BitSets
+        var maxID = 0;
+        FindMax(_all, ref maxID);
+        FindMax(_any, ref maxID);
+        FindMax(_absent, ref maxID);
+        FindMax(_none, ref maxID);
+        FindMax(_disabled, ref maxID);
+        FindMax(_present, ref maxID);
+
+        // 2. Create the Mask
+        var mask = new EntityQueryMask
+        {
+            structuralAll = new UnsafeBitSet(maxID + 1, allocator, AllocationOption.Clear),
+            structuralAny = new UnsafeBitSet(maxID + 1, allocator, AllocationOption.Clear),
+            structuralAbsent = new UnsafeBitSet(maxID + 1, allocator, AllocationOption.Clear),
+            requireEnabled = new UnsafeBitSet(maxID + 1, allocator, AllocationOption.Clear),
+            requireDisabled = new UnsafeBitSet(maxID + 1, allocator, AllocationOption.Clear),
+            rejectIfEnabled = new UnsafeBitSet(maxID + 1, allocator, AllocationOption.Clear),
+
+            writeAccess = new UnsafeBitSet(maxID + 1, allocator, AllocationOption.Clear),
+        };
+
+        // 3. Fill BitSets
+        foreach (var id in _all)
+        {
+            mask.structuralAll.SetBit(id);  // Structure: Must Exist
+            mask.requireEnabled.SetBit(id); // Filter: Must be Enabled
+        }
+
+        foreach (var id in _disabled)
+        {
+            mask.structuralAll.SetBit(id);   // Structure: Must Exist
+            mask.requireDisabled.SetBit(id); // Filter: Must be Disabled
+        }
+
+        foreach (var id in _none)
+        {
+            if (ComponentRegister.GetComponentInfo(id).isEnableable)
+            {
+                mask.rejectIfEnabled.SetBit(id); // Filter: Must Not be Enabled (Can be Absent or Disabled)
+            }
+            else
+            {
+                mask.structuralAbsent.SetBit(id); // Structure: Must Not Exist
+            }
+        }
+
+        foreach (var id in _present)
+        {
+            mask.structuralAll.SetBit(id);
+        }
+
+        foreach (var id in _absent)
+        {
+            mask.structuralAbsent.SetBit(id);
+        }
+
+        foreach (var id in _any)
+        {
+            mask.structuralAny.SetBit(id);
+        }
+
+        foreach (var id in _rw)
+        {
+            mask.writeAccess.SetBit(id);
+        }
+
+        // 4. Ask World for the Query (Cached)
+        var maskHash = mask.GetHashCode();
+        var queryID = world.GetEntityQueryIDByMaskHash(maskHash);
+        if (queryID.IsValid)
+        {
+            // Check if the masks are actually equal (Hash collision?).
+            // Really worth it? It's unlikely to have collisions here.
+            if (world.GetEntityQueryReference(queryID)._mask.Equals(mask))
+            {
+                mask.Dispose();
+                goto Return;
+            }
+        }
+
+        // NOTE: We do not dispose the mask here, as it is now owned by the EntityQuery.
+        queryID = world.CreateEntityQuery(mask, maskHash);
+
+    Return:
+        Dispose();
+        return queryID;
+    }
+
+    private void Dispose()
+    {
+        _scope.Dispose();
+    }
+}

Ghost.Entities/Query/QueryBuilder.cs

@@ -1,42 +0,0 @@
-using Ghost.Core;
-
-namespace Ghost.Entities.Query;
-
-public struct QueryBuilder
-{
-    private QueryFilter _filter;
-
-    public QueryBuilder()
-    {
-        _filter = new QueryFilter();
-    }
-
-    public QueryBuilder WithAll<T>()
-    {
-        _filter._all.Add(TypeHandle.Get<T>());
-        return this;
-    }
-
-    public QueryBuilder WithAny<T>()
-    {
-        _filter._any.Add(TypeHandle.Get<T>());
-        return this;
-    }
-
-    public QueryBuilder WithAbsent<T>()
-    {
-        _filter._absent.Add(TypeHandle.Get<T>());
-        return this;
-    }
-
-    public QueryBuilder WithDisabled<T>()
-    {
-        _filter._disabled.Add(TypeHandle.Get<T>());
-        return this;
-    }
-
-    public readonly QueryFilter Build()
-    {
-        return _filter;
-    }
-}

Ghost.Entities/Query/QueryFilter.cs

@@ -1,97 +0,0 @@
-using Ghost.Core;
-using Misaki.HighPerformance.LowLevel.Buffer;
-using Misaki.HighPerformance.LowLevel.Collections;
-
-namespace Ghost.Entities.Query;
-
-public struct QueryFilter : IDisposable
-{
-    //private readonly Stack.Scope _scope;
-
-    internal UnsafeList<TypeHandle> _all;
-    internal UnsafeList<TypeHandle> _any;
-    internal UnsafeList<TypeHandle> _absent;
-    internal UnsafeList<TypeHandle> _disabled;
-
-    public QueryFilter()
-    {
-        //_scope = AllocationManager.CreateStackScope();
-
-        _all = new UnsafeList<TypeHandle>(4, Allocator.Stack);
-        _any = new UnsafeList<TypeHandle>(4, Allocator.Stack);
-        _absent = new UnsafeList<TypeHandle>(4, Allocator.Stack);
-        _disabled = new UnsafeList<TypeHandle>(4, Allocator.Stack);
-    }
-
-    public readonly UnsafeBitSet ComputeFilterBitMask(World world, Allocator allocator)
-    {
-        UnsafeBitSet allMask = default;
-        UnsafeBitSet anyMask = default;
-        UnsafeBitSet absentMask = default;
-
-        var result = new UnsafeBitSet(world.EntityManager.EntityCount, allocator);
-        result.ClearAll();
-
-        using (AllocationManager.CreateStackScope())
-        {
-            foreach (var typeHandle in _all)
-            {
-                var mask = world.ComponentStorage.GetOrCreateMask(typeHandle);
-
-                if (!allMask.IsCreated)
-                {
-                    allMask = new UnsafeBitSet(mask.Count, Allocator.Stack, AllocationOption.None);
-                    allMask.SetAll();
-                }
-
-                allMask.And(mask);
-            }
-
-            foreach (var typeHandle in _any)
-            {
-                var mask = world.ComponentStorage.GetOrCreateMask(typeHandle);
-
-                if (!anyMask.IsCreated)
-                {
-                    anyMask = new UnsafeBitSet(mask.Count, Allocator.Stack);
-                }
-
-                anyMask.And(mask);
-            }
-
-            foreach (var typeHandle in _absent)
-            {
-                var mask = world.ComponentStorage.GetOrCreateMask(typeHandle);
-
-                if (!absentMask.IsCreated)
-                {
-                    absentMask = new UnsafeBitSet(mask.Count, Allocator.Stack);
-                }
-
-                absentMask.Or(mask);
-            }
-
-            if (allMask.IsCreated)
-            {
-                result.And(allMask);
-            }
-
-            if (anyMask.IsCreated)
-            {
-                result.And(anyMask);
-            }
-
-            if (absentMask.IsCreated)
-            {
-                result.ANDC(absentMask);
-            }
-        }
-
-        return result;
-    }
-
-    public readonly void Dispose()
-    {
-        //_scope.Dispose();
-    }
-}

Ghost.Entities/Query/QueryTypeParameter.cs

@@ -1,73 +0,0 @@
-using Ghost.Entities.Components;
-using System.Runtime.CompilerServices;
-
-namespace Ghost.Entities.Query;
-
-public interface IQueryTypeParameter<T>
-    where T : IComponentData
-{
-}
-
-public ref struct CompRef<T> : IQueryTypeParameter<T>
-    where T : IComponentData
-{
-    internal ref T _value;
-
-    public ref T ValueRW
-    {
-        [MethodImpl(MethodImplOptions.AggressiveInlining)]
-        get => ref _value;
-    }
-
-    public readonly ref T ValueRO
-    {
-        [MethodImpl(MethodImplOptions.AggressiveInlining)]
-        get => ref _value;
-    }
-
-    public readonly bool IsValid
-    {
-        get;
-        init;
-    }
-
-    public CompRef(ref T value, bool isValid)
-    {
-        _value = ref value;
-        IsValid = isValid;
-    }
-
-    public CompRef(ref T value)
-        : this(ref value, true)
-    {
-    }
-}
-
-public readonly ref struct CompRO<T> : IQueryTypeParameter<T>
-    where T : IComponentData
-{
-    internal readonly ref T _value;
-
-    public readonly ref T ValueRO
-    {
-        [MethodImpl(MethodImplOptions.AggressiveInlining)]
-        get => ref _value;
-    }
-
-    public readonly bool IsValid
-    {
-        get;
-        init;
-    }
-
-    public CompRO(ref T value, bool isValid)
-    {
-        _value = ref value;
-        IsValid = isValid;
-    }
-
-    public CompRO(ref T value)
-        : this(ref value, true)
-    {
-    }
-}

Ghost.Entities/System.cs

@@ -0,0 +1,407 @@
+using Ghost.Core;
+
+namespace Ghost.Entities;
+
+public readonly ref struct SystemAPI
+{
+    public TimeData Time
+    {
+        get; init;
+    }
+}
+
+public interface ISystem
+{
+    World World
+    {
+        get; init;
+    }
+
+    void Initialize(ref readonly SystemAPI systemAPI);
+    void Update(ref readonly SystemAPI systemAPI);
+    void Cleanup(ref readonly SystemAPI systemAPI);
+}
+
+public abstract class SystemBase : ISystem
+{
+    private List<int>? _requiredQueries;
+
+    public World World
+    {
+        get; init;
+    } = null!;
+
+    public int LastSystemVersion
+    {
+        get; internal set;
+    } = -2;
+
+    private bool ShouldUpdate()
+    {
+        if (_requiredQueries == null || _requiredQueries.Count == 0)
+        {
+            return true;
+        }
+
+        foreach (var queryID in _requiredQueries)
+        {
+            ref var query = ref World.GetEntityQueryReference(new Identifier<EntityQuery>(queryID));
+            if (query.GetEntityCount() == 0)
+            {
+                return false;
+            }
+        }
+
+        return true;
+    }
+
+    protected void RequireQueryForUpdate(Identifier<EntityQuery> queryID)
+    {
+        _requiredQueries ??= new List<int>(4);
+        _requiredQueries.Add(queryID.value);
+    }
+
+    public void Initialize(ref readonly SystemAPI systemAPI)
+    {
+        OnInitialize(in systemAPI);
+    }
+
+    public void Update(ref readonly SystemAPI systemAPI)
+    {
+        if (ShouldUpdate())
+        {
+            if (World.Version - LastSystemVersion > 1)
+            {
+                OnStartRunning();
+            }
+
+            OnUpdate(in systemAPI);
+            LastSystemVersion = World.Version;
+        }
+        else
+        {
+            if (World.Version - LastSystemVersion <= 1)
+            {
+                OnStopRunning();
+            }
+        }
+    }
+
+    public void Cleanup(ref readonly SystemAPI systemAPI)
+    {
+        OnCleanup(in systemAPI);
+    }
+
+    protected virtual void OnInitialize(ref readonly SystemAPI systemAPI)
+    {
+    }
+
+    protected virtual void OnUpdate(ref readonly SystemAPI systemAPI)
+    {
+    }
+
+    protected virtual void OnCleanup(ref readonly SystemAPI systemAPI)
+    {
+    }
+
+    protected virtual void OnStopRunning()
+    {
+    }
+
+    protected virtual void OnStartRunning()
+    {
+    }
+}
+
+[AttributeUsage(AttributeTargets.Class | AttributeTargets.Struct, AllowMultiple = true)]
+public class UpdateAfterAttribute : Attribute
+{
+    public Type SystemType { get; }
+
+    public UpdateAfterAttribute(Type systemType)
+    {
+        SystemType = systemType;
+    }
+}
+
+[AttributeUsage(AttributeTargets.Class | AttributeTargets.Struct, AllowMultiple = true)]
+public class UpdateBeforeAttribute : Attribute
+{
+    public Type SystemType { get; }
+
+    public UpdateBeforeAttribute(Type systemType)
+    {
+        SystemType = systemType;
+    }
+}
+
+[AttributeUsage(AttributeTargets.Class | AttributeTargets.Struct, AllowMultiple = false)]
+public class SystemGroupAttribute : Attribute
+{
+    public Type GroupType { get; }
+
+    public SystemGroupAttribute(Type groupType)
+    {
+        GroupType = groupType;
+    }
+}
+
+#if false
+internal static partial class SystemGroupRegistry
+{
+    private static readonly Dictionary<Type, List<ISystem>> _systemGroupMap = new();
+
+    // TODO: Use Source Generators to generate group registrations at compile time.
+
+    public static void RegisterSystemGroup<T>(Type groupType)
+        where T : ISystem, new()
+    {
+        if (!_systemGroupMap.ContainsKey(typeof(T)))
+        {
+            _systemGroupMap[typeof(T)] = new();
+        }
+
+        _systemGroupMap[groupType].Add(new T());
+    }
+
+    public static List<ISystem> GetSystemsForGroup(Type groupType)
+    {
+        if (_systemGroupMap.TryGetValue(groupType, out var systems))
+        {
+            return systems;
+        }
+
+        throw new InvalidOperationException($"No systems registered for System Group of type {groupType.FullName}");
+    }
+}
+#endif
+
+public abstract class SystemGroup : ISystem
+{
+    private readonly List<ISystem> _systems = [];
+    private List<ISystem>? _sortedSystems;
+
+    private uint _version = 0;
+    private uint _sortedVersion = 0;
+
+    public World World
+    {
+        get; init;
+    } = null!;
+
+    // public SystemGroup()
+    // {
+    //     _systems = SystemGroupRegistry.GetSystemsForGroup(GetType());
+    // }
+
+    private static List<ISystem> Sort(List<ISystem> systems)
+    {
+        // 1. Build the Graph
+        // Key: The System, Value: Systems that MUST run before the Key
+        var dependencies = new Dictionary<Type, HashSet<Type>>();
+        var systemMap = systems.ToDictionary(s => s.GetType(), s => s);
+
+        foreach (var sys in systems)
+        {
+            var type = sys.GetType();
+            if (!dependencies.TryGetValue(type, out HashSet<Type>? value))
+            {
+                value = [];
+                dependencies[type] = value;
+            }
+
+            // Handle [UpdateAfter(typeof(Other))] -> Other comes before This
+            foreach (var attr in type.GetCustomAttributes(typeof(UpdateAfterAttribute), true))
+            {
+                var depType = ((UpdateAfterAttribute)attr).SystemType;
+                value.Add(depType);
+            }
+
+            // Handle [UpdateBefore(typeof(Other))] -> This comes before Other
+            // Which means: Other depends on This
+            foreach (var attr in type.GetCustomAttributes(typeof(UpdateBeforeAttribute), true))
+            {
+                var targetType = ((UpdateBeforeAttribute)attr).SystemType;
+                if (!dependencies.ContainsKey(targetType)) dependencies[targetType] = [];
+                dependencies[targetType].Add(type);
+            }
+        }
+
+        // 2. Topological Sort (Kahn's Algorithm variant)
+        var sortedList = new List<ISystem>();
+        var visited = new HashSet<Type>();
+
+        // We loop until we have sorted everyone
+        while (sortedList.Count < systems.Count)
+        {
+            bool addedAny = false;
+
+            foreach (var sys in systems)
+            {
+                var type = sys.GetType();
+                if (visited.Contains(type)) continue;
+
+                // Check if all dependencies for this system are already visited/sorted
+                bool canRun = true;
+                if (dependencies.TryGetValue(type, out var deps))
+                {
+                    foreach (var dep in deps)
+                    {
+                        // If the dependency exists in our list but hasn't run yet, we can't run.
+                        // (We check systemMap to ignore dependencies that don't exist in this world)
+                        if (systemMap.ContainsKey(dep) && !visited.Contains(dep))
+                        {
+                            canRun = false;
+                            break;
+                        }
+                    }
+                }
+
+                if (canRun)
+                {
+                    sortedList.Add(sys);
+                    visited.Add(type);
+                    addedAny = true;
+                }
+            }
+
+            if (!addedAny)
+            {
+                throw new InvalidOperationException("Circular Dependency detected in Systems! Check your [UpdateAfter] attributes.");
+            }
+        }
+
+        return sortedList;
+    }
+
+    public void AddSystem<T>()
+        where T : ISystem, new()
+    {
+        _systems.Add(new T()
+        {
+            World = World
+        });
+
+        _version++;
+    }
+
+    public void SortSystems()
+    {
+        if (_sortedVersion == _version)
+        {
+            return;
+        }
+
+        if (_systems.Count == 0)
+        {
+            _sortedSystems = [];
+            _sortedVersion = _version;
+            return;
+        }
+
+        _sortedSystems = Sort(_systems);
+        _sortedVersion = _version;
+    }
+
+    private void ThrowIfNotSorted()
+    {
+        if (_sortedSystems == null || _sortedVersion != _version)
+        {
+            throw new InvalidOperationException("Systems must be sorted before calling this method. Call SortSystems() after adding all systems.");
+        }
+    }
+
+    public void Initialize(ref readonly SystemAPI systemAPI)
+    {
+        ThrowIfNotSorted();
+
+        foreach (var system in _sortedSystems!)
+        {
+            system.Initialize(in systemAPI);
+        }
+    }
+
+    public void Update(ref readonly SystemAPI systemAPI)
+    {
+        ThrowIfNotSorted();
+
+        foreach (var system in _sortedSystems!)
+        {
+            system.Update(in systemAPI);
+        }
+    }
+
+    public void Cleanup(ref readonly SystemAPI systemAPI)
+    {
+        ThrowIfNotSorted();
+
+        foreach (var system in _sortedSystems!)
+        {
+            system.Cleanup(in systemAPI);
+        }
+    }
+}
+
+public class DefaultSystemGroup : SystemGroup
+{
+}
+
+public class SystemManager
+{
+    private readonly World _world;
+
+    private readonly List<ISystem> _systems = [];
+
+    internal SystemManager(World world)
+    {
+        _world = world;
+        AddSystem<DefaultSystemGroup>();
+    }
+
+    public void AddSystem<T>()
+        where T : ISystem, new()
+    {
+        _systems.Add(new T()
+        {
+            World = _world
+        });
+    }
+
+    public T GetSystem<T>()
+        where T : ISystem
+    {
+        foreach (var system in _systems)
+        {
+            if (system is T typedSystem)
+            {
+                return typedSystem;
+            }
+        }
+
+        throw new InvalidOperationException($"System of type {typeof(T).FullName} not found in SystemManager.");
+    }
+
+    internal void InitializeAll(ref readonly SystemAPI systemAPI)
+    {
+        foreach (var system in _systems)
+        {
+            system.Initialize(in systemAPI);
+        }
+    }
+
+    internal void UpdateAll(ref readonly SystemAPI systemAPI)
+    {
+        foreach (var system in _systems)
+        {
+            system.Update(in systemAPI);
+        }
+    }
+
+    internal void CleanupAll(ref readonly SystemAPI systemAPI)
+    {
+        foreach (var system in _systems)
+        {
+            system.Cleanup(in systemAPI);
+        }
+    }
+}

Ghost.Entities/Systems/ISystem.cs

@@ -1,27 +0,0 @@
-namespace Ghost.Entities.Systems;
-
-/// <summary>
-/// Attribute to declare that a system depends on one or more other systems.
-/// </summary>
-[AttributeUsage(AttributeTargets.Struct | AttributeTargets.Class, AllowMultiple = false)]
-public class DependsOnAttribute : Attribute
-{
-    public Type[] Prerequisites
-    {
-        get;
-    }
-
-    public DependsOnAttribute(params Type[] prerequisites)
-    {
-        Prerequisites = prerequisites;
-    }
-}
-
-public interface ISystem
-{
-    public void OnCreate(in SystemState state);
-
-    public void OnUpdate(in SystemState state);
-
-    public void OnDestroy(in SystemState state);
-}

Ghost.Entities/Systems/SystemDependencyBuilder.cs

@@ -1,105 +0,0 @@
-using System.Reflection;
-
-namespace Ghost.Entities.Systems;
-
-internal class SystemDependencyBuilder
-{
-    private readonly Dictionary<Type, List<Type>> _dependencies = new();
-    private readonly List<Type> _systemTypes;
-
-    public SystemDependencyBuilder(List<Type> allSystemTypes)
-    {
-        _systemTypes = allSystemTypes;
-    }
-
-    /// <summary>
-    /// Builds a dependency graph for all system types that implement the <see cref="ISystem"/> interface.
-    /// </summary>
-    /// <remarks>This method analyzes all system types and their dependencies, as defined by the <see
-    /// cref="DependsOnAttribute"/>. It validates that each system type is a concrete implementation of <see
-    /// cref="ISystem"/> and constructs a mapping of each system type to its direct dependencies.</remarks>
-    /// <exception cref="ArgumentException">Thrown if a type in <c>allSystemTypes</c> is not a concrete implementation of <see cref="ISystem"/>.</exception>
-    public void BuildDependencyGraph()
-    {
-        foreach (var systemType in _systemTypes)
-        {
-            if (!typeof(ISystem).IsAssignableFrom(systemType) || systemType.IsAbstract || systemType.IsInterface)
-            {
-                throw new ArgumentException($"{systemType.Name} is not a concrete ISystem type.");
-            }
-
-            var directDependencies = new List<Type>();
-            var dependsOnAttributes = systemType.GetCustomAttributes<DependsOnAttribute>(false);
-            foreach (var attr in dependsOnAttributes)
-            {
-                directDependencies.AddRange(attr.Prerequisites);
-            }
-
-            _dependencies[systemType] = directDependencies;
-        }
-    }
-
-    private void Visit(Type systemType, HashSet<Type> visited, HashSet<Type> permanentMark, List<Type> executionOrder)
-    {
-        if (permanentMark.Contains(systemType))
-        {
-            return;
-        }
-
-        if (visited.Contains(systemType))
-        {
-            throw new InvalidOperationException($"Circular dependency detected involving system: {systemType.Name}");
-        }
-
-        visited.Add(systemType); // Mark as currently visiting
-
-        if (_dependencies.TryGetValue(systemType, out var directDependencies))
-        {
-            foreach (var dependencyType in directDependencies)
-            {
-                // Ensure the dependency is a registered system type
-                if (!_systemTypes.Contains(dependencyType))
-                {
-                    throw new InvalidOperationException($"System {systemType.Name} depends on unregistered system {dependencyType.Name}.");
-                }
-
-                Visit(dependencyType, visited, permanentMark, executionOrder);
-            }
-        }
-
-        visited.Remove(systemType); // Done visiting this node in the current path
-        permanentMark.Add(systemType); // Mark as permanently processed
-        executionOrder.Add(systemType); // Add to the sorted list (this will be reversed later for correct order)
-    }
-
-    /// <summary>
-    /// Builds the topological order of systems.
-    /// </summary>
-    /// <returns>A list of system types in the order they should be executed.</returns>
-    /// <exception cref="InvalidOperationException">Thrown if a circular dependency is detected.</exception>"
-    public List<Type> BuildExecutionOrder()
-    {
-        var executionOrder = new List<Type>(_systemTypes.Count);
-        var visited = new HashSet<Type>(); // Tracks visited nodes in the current DFS path (for cycle detection)
-        var permanentMark = new HashSet<Type>(); // Tracks nodes whose dependencies have been fully resolved
-
-        // Initialize dependencies for all registered systems, even those without explicit attributes
-        foreach (var sysType in _systemTypes)
-        {
-            if (!_dependencies.ContainsKey(sysType))
-            {
-                _dependencies[sysType] = new();
-            }
-        }
-
-        foreach (var systemType in _systemTypes)
-        {
-            if (!permanentMark.Contains(systemType))
-            {
-                Visit(systemType, visited, permanentMark, executionOrder);
-            }
-        }
-
-        return executionOrder;
-    }
-}

Ghost.Entities/Systems/SystemState.cs

@@ -1,10 +0,0 @@
-namespace Ghost.Entities.Systems;
-
-public struct SystemState
-{
-    public World World
-    {
-        get;
-        init;
-    }
-}

Ghost.Entities/Systems/SystemStorage.cs

@@ -1,93 +0,0 @@
-using System.Runtime.CompilerServices;
-using System.Runtime.InteropServices;
-
-namespace Ghost.Entities.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();
-    }
-}

Ghost.Entities/Template/ForEach.cs

@@ -1,12 +0,0 @@
-
-
-namespace Ghost.Entities;
-
-public delegate void ForEach<T0>(ref T0 t0Component);
-public delegate void ForEach<T0, T1>(ref T0 t0Component, ref T1 t1Component);
-public delegate void ForEach<T0, T1, T2>(ref T0 t0Component, ref T1 t1Component, ref T2 t2Component);
-public delegate void ForEach<T0, T1, T2, T3>(ref T0 t0Component, ref T1 t1Component, ref T2 t2Component, ref T3 t3Component);
-public delegate void ForEach<T0, T1, T2, T3, T4>(ref T0 t0Component, ref T1 t1Component, ref T2 t2Component, ref T3 t3Component, ref T4 t4Component);
-public delegate void ForEach<T0, T1, T2, T3, T4, T5>(ref T0 t0Component, ref T1 t1Component, ref T2 t2Component, ref T3 t3Component, ref T4 t4Component, ref T5 t5Component);
-public delegate void ForEach<T0, T1, T2, T3, T4, T5, T6>(ref T0 t0Component, ref T1 t1Component, ref T2 t2Component, ref T3 t3Component, ref T4 t4Component, ref T5 t5Component, ref T6 t6Component);
-public delegate void ForEach<T0, T1, T2, T3, T4, T5, T6, T7>(ref T0 t0Component, ref T1 t1Component, ref T2 t2Component, ref T3 t3Component, ref T4 t4Component, ref T5 t5Component, ref T6 t6Component, ref T7 t7Component);

Ghost.Entities/Template/ForEach.tt

@@ -1,16 +0,0 @@
-<#@ template language="C#" #>
-<#@ output extension=".cs" #>
-<#@ assembly name="System.Core" #>
-<#@ import namespace="System.Linq" #>
-<#@ import namespace="System.Text" #>
-<#@ include file="Helpers.ttinclude" #>
-
-namespace Ghost.Entities;
-
-<# for (var i = 1; i <= Amount; i++)
-{
-    var generics = AppendGenerics(i);
-    var compGenerics = AppendGenericRefParameters(i);
-#>
-public delegate void ForEach<<#= generics #>>(<#= compGenerics #>);
-<# } #>

Ghost.Entities/Template/QueryEnumerable.tt

@@ -1,175 +0,0 @@
-<#@ template language="C#" #>
-<#@ output extension=".cs" #>
-<#@ assembly name="System.Core" #>
-<#@ import namespace="System.Text" #>
-<#@ import namespace="System.Linq" #>
-<#@ include file="Helpers.ttinclude" #>
-
-using Ghost.Core;
-using Ghost.Entities.Components;
-using Ghost.Entities.Query;
-using Misaki.HighPerformance.LowLevel.Buffer;
-using Misaki.HighPerformance.LowLevel.Collections;
-
-namespace Ghost.Entities;
-
-<# for (int arity = 1; arity <= Amount; arity++) {
-var generics = AppendGenerics(arity);
-var restrictions = AppendGenericRestrictions(arity, "unmanaged, IComponentData");
-var poolParams = Enumerable.Range(0, arity)
-                            .Select(i => $"ComponentPool<T{i}> pool{i}")
-                            .Aggregate((a, b) => a + ", " + b);
-var constructorParams = Enumerable.Range(0, arity)
-                                    .Select(i => $"_pool{i}")
-                                    .Aggregate((a, b) => a + ", " + b);
-    
-#>
-public unsafe ref struct QueryEnumerable<<#= generics #>>
-    <#= restrictions #>
-{
-    private QueryFilter _filter;
-
-    private readonly World _world;
-
-<# for (int i = 0; i < arity; i++){ #>
-    private readonly ComponentPool<T<#= i #>> _pool<#= i #>;
-<# } #>
-    private readonly int _count;
-
-    internal QueryEnumerable(World world, <#= poolParams #>, int count)
-    {
-        _filter = new();
-<# for (int i = 0; i < arity; i++) {#>
-        _filter._all.Add(TypeHandle.Get<T<#= i #>>());
-<# } #>
-
-        _world = world;
-
-<# for (int i = 0; i < arity; i++) { #>
-        _pool<#= i #> = pool<#= i #>;
-<# } #>
-
-        _count = count;
-    }
-
-    internal QueryEnumerable(World world, <#= poolParams #>, int count, ref readonly QueryFilter filter)
-    {
-        _filter = filter;
-
-        _world = world;
-
-<# for (int i = 0; i < arity; i++) { #>
-        _pool<#= i #> = pool<#= i #>;
-<# } #>
-
-        _count = count;
-    }
-
-#pragma warning disable CS9084 // Struct member returns 'this' or other instance members by reference
-    public Enumerator GetEnumerator() => new(_world, <#= constructorParams #>, _count, ref _filter);
-#pragma warning restore CS9084 // Struct member returns 'this' or other instance members by reference
-
-    public ref struct Enumerator
-    {
-        private ref QueryFilter _filter;
-        private UnsafeBitSet _filterMask;
-        
-        private readonly ReadOnlySpan<Entity> _entities;
-        private readonly Stack.Scope _stackScope;
-
-<# for (int i = 0; i < arity; i++){ #>
-        private readonly ComponentPool<T<#= i #>> _pool<#= i #>;
-<# } #>
-
-        private int _index;
-        private int _count;
-
-        public QueryItem<<#= generics #>> Current
-        {
-            get;
-            private set;
-        }
-
-        internal Enumerator(World world, <#= poolParams #>, int count, ref QueryFilter filter)
-        {
-            _stackScope = AllocationManager.CreateStackScope();
-
-            _filter = ref filter;
-            _filterMask = _filter.ComputeFilterBitMask(world, Allocator.Stack);
-
-            _entities = world.EntityManager.Entities;
-
-<# for (int i = 0; i < arity; i++){ #>
-            _pool<#= i #> = pool<#= i #>;
-<# } #>
-
-            _count = count;
-            _index = -1;
-
-            Current = default;
-        }
-
-        public bool MoveNext()
-        {
-            _index = _filterMask.NextSetBit(_index + 1);
-            if (_index < 0 || _count <= 0)
-            {
-                return false;
-            }
-
-            _count--;
-            Current = new QueryItem<<#= generics #>>(_entities[_index], <#= constructorParams #>);
-
-            return true;
-        }
-
-        public readonly void Dispose()
-        {
-            _stackScope.Dispose();
-            _filter.Dispose();
-        }
-    }
-<# for (int i = 1; i <= ExtensionAmount; i++) {
-var compGenerics = AppendGenerics(i, "TComponent");
-var compRestrictions = AppendGenericRestrictions(i, "TComponent", "unmanaged, IComponentData");
-#>
-
-	public QueryEnumerable<<#= generics #>> WithAll<<#= compGenerics #>>()
-		<#= compRestrictions #>
-	{
-<# for (int j = 0; j < i; j++) {#>
-        _filter._all.Add(TypeHandle.Get<TComponent<#= j #>>());
-<# } #>
-        return this;
-	}
-
-    public QueryEnumerable<<#= generics #>> WithAny<<#= compGenerics #>>()
-		<#= compRestrictions #>
-	{
-<# for (int j = 0; j < i; j++) {#>
-        _filter._any.Add(TypeHandle.Get<TComponent<#= j #>>());
-<# } #>
-        return this;
-	}
-
-    public QueryEnumerable<<#= generics #>> WithAbsent<<#= compGenerics #>>()
-		<#= compRestrictions #>
-	{
-<# for (int j = 0; j < i; j++) {#>
-        _filter._absent.Add(TypeHandle.Get<TComponent<#= j #>>());
-<# } #>
-        return this;
-	}
-
-    public QueryEnumerable<<#= generics #>> WithDisabled<<#= compGenerics #>>()
-		<#= compRestrictions #>
-	{
-<# for (int j = 0; j < i; j++) {#>
-        _filter._disabled.Add(TypeHandle.Get<TComponent<#= j #>>());
-<# } #>
-        return this;
-	}
-<# } #>
-}
-
-<# } #>

Ghost.Entities/Template/QueryItem.cs

@@ -1,319 +0,0 @@
-
-
-using Ghost.Entities.Components;
-using Ghost.Entities.Query;
-
-namespace Ghost.Entities;
-
-public readonly struct QueryItem<T0>
-    where T0 : unmanaged, IComponentData
-{
-    private readonly Entity _entity;
-    private readonly ComponentPool<T0> _pool0;
-
-    internal QueryItem(Entity entity, ComponentPool<T0> pool0)
-    {
-        _entity = entity;
-        _pool0 = pool0;
-    }
-
-    public Entity Entity => _entity;
-
-    public ref T0 Component0 => ref _pool0.GetRef(_entity);
-
-    // Deconstruct into tuple-like values
-    public void Deconstruct(out Entity entity, out CompRef<T0> c0)
-    {
-        entity = _entity;
-
-        c0 = new(ref _pool0.GetRef(_entity));
-    }
-}
-
-public readonly struct QueryItem<T0, T1>
-    where T0 : unmanaged, IComponentData where T1 : unmanaged, IComponentData
-{
-    private readonly Entity _entity;
-    private readonly ComponentPool<T0> _pool0;
-    private readonly ComponentPool<T1> _pool1;
-
-    internal QueryItem(Entity entity, ComponentPool<T0> pool0, ComponentPool<T1> pool1)
-    {
-        _entity = entity;
-        _pool0 = pool0;
-        _pool1 = pool1;
-    }
-
-    public Entity Entity => _entity;
-
-    public ref T0 Component0 => ref _pool0.GetRef(_entity);
-    public ref T1 Component1 => ref _pool1.GetRef(_entity);
-
-    // Deconstruct into tuple-like values
-    public void Deconstruct(out Entity entity, out CompRef<T0> c0, out CompRef<T1> c1)
-    {
-        entity = _entity;
-
-        c0 = new(ref _pool0.GetRef(_entity));
-        c1 = new(ref _pool1.GetRef(_entity));
-    }
-}
-
-public readonly struct QueryItem<T0, T1, T2>
-    where T0 : unmanaged, IComponentData where T1 : unmanaged, IComponentData where T2 : unmanaged, IComponentData
-{
-    private readonly Entity _entity;
-    private readonly ComponentPool<T0> _pool0;
-    private readonly ComponentPool<T1> _pool1;
-    private readonly ComponentPool<T2> _pool2;
-
-    internal QueryItem(Entity entity, ComponentPool<T0> pool0, ComponentPool<T1> pool1, ComponentPool<T2> pool2)
-    {
-        _entity = entity;
-        _pool0 = pool0;
-        _pool1 = pool1;
-        _pool2 = pool2;
-    }
-
-    public Entity Entity => _entity;
-
-    public ref T0 Component0 => ref _pool0.GetRef(_entity);
-    public ref T1 Component1 => ref _pool1.GetRef(_entity);
-    public ref T2 Component2 => ref _pool2.GetRef(_entity);
-
-    // Deconstruct into tuple-like values
-    public void Deconstruct(out Entity entity, out CompRef<T0> c0, out CompRef<T1> c1, out CompRef<T2> c2)
-    {
-        entity = _entity;
-
-        c0 = new(ref _pool0.GetRef(_entity));
-        c1 = new(ref _pool1.GetRef(_entity));
-        c2 = new(ref _pool2.GetRef(_entity));
-    }
-}
-
-public readonly struct QueryItem<T0, T1, T2, T3>
-    where T0 : unmanaged, IComponentData where T1 : unmanaged, IComponentData where T2 : unmanaged, IComponentData where T3 : unmanaged, IComponentData
-{
-    private readonly Entity _entity;
-    private readonly ComponentPool<T0> _pool0;
-    private readonly ComponentPool<T1> _pool1;
-    private readonly ComponentPool<T2> _pool2;
-    private readonly ComponentPool<T3> _pool3;
-
-    internal QueryItem(Entity entity, ComponentPool<T0> pool0, ComponentPool<T1> pool1, ComponentPool<T2> pool2, ComponentPool<T3> pool3)
-    {
-        _entity = entity;
-        _pool0 = pool0;
-        _pool1 = pool1;
-        _pool2 = pool2;
-        _pool3 = pool3;
-    }
-
-    public Entity Entity => _entity;
-
-    public ref T0 Component0 => ref _pool0.GetRef(_entity);
-    public ref T1 Component1 => ref _pool1.GetRef(_entity);
-    public ref T2 Component2 => ref _pool2.GetRef(_entity);
-    public ref T3 Component3 => ref _pool3.GetRef(_entity);
-
-    // Deconstruct into tuple-like values
-    public void Deconstruct(out Entity entity, out CompRef<T0> c0, out CompRef<T1> c1, out CompRef<T2> c2, out CompRef<T3> c3)
-    {
-        entity = _entity;
-
-        c0 = new(ref _pool0.GetRef(_entity));
-        c1 = new(ref _pool1.GetRef(_entity));
-        c2 = new(ref _pool2.GetRef(_entity));
-        c3 = new(ref _pool3.GetRef(_entity));
-    }
-}
-
-public readonly struct QueryItem<T0, T1, T2, T3, T4>
-    where T0 : unmanaged, IComponentData where T1 : unmanaged, IComponentData where T2 : unmanaged, IComponentData where T3 : unmanaged, IComponentData where T4 : unmanaged, IComponentData
-{
-    private readonly Entity _entity;
-    private readonly ComponentPool<T0> _pool0;
-    private readonly ComponentPool<T1> _pool1;
-    private readonly ComponentPool<T2> _pool2;
-    private readonly ComponentPool<T3> _pool3;
-    private readonly ComponentPool<T4> _pool4;
-
-    internal QueryItem(Entity entity, ComponentPool<T0> pool0, ComponentPool<T1> pool1, ComponentPool<T2> pool2, ComponentPool<T3> pool3, ComponentPool<T4> pool4)
-    {
-        _entity = entity;
-        _pool0 = pool0;
-        _pool1 = pool1;
-        _pool2 = pool2;
-        _pool3 = pool3;
-        _pool4 = pool4;
-    }
-
-    public Entity Entity => _entity;
-
-    public ref T0 Component0 => ref _pool0.GetRef(_entity);
-    public ref T1 Component1 => ref _pool1.GetRef(_entity);
-    public ref T2 Component2 => ref _pool2.GetRef(_entity);
-    public ref T3 Component3 => ref _pool3.GetRef(_entity);
-    public ref T4 Component4 => ref _pool4.GetRef(_entity);
-
-    // Deconstruct into tuple-like values
-    public void Deconstruct(out Entity entity, out CompRef<T0> c0, out CompRef<T1> c1, out CompRef<T2> c2, out CompRef<T3> c3, out CompRef<T4> c4)
-    {
-        entity = _entity;
-
-        c0 = new(ref _pool0.GetRef(_entity));
-        c1 = new(ref _pool1.GetRef(_entity));
-        c2 = new(ref _pool2.GetRef(_entity));
-        c3 = new(ref _pool3.GetRef(_entity));
-        c4 = new(ref _pool4.GetRef(_entity));
-    }
-}
-
-public readonly struct QueryItem<T0, T1, T2, T3, T4, T5>
-    where T0 : unmanaged, IComponentData where T1 : unmanaged, IComponentData where T2 : unmanaged, IComponentData where T3 : unmanaged, IComponentData where T4 : unmanaged, IComponentData where T5 : unmanaged, IComponentData
-{
-    private readonly Entity _entity;
-    private readonly ComponentPool<T0> _pool0;
-    private readonly ComponentPool<T1> _pool1;
-    private readonly ComponentPool<T2> _pool2;
-    private readonly ComponentPool<T3> _pool3;
-    private readonly ComponentPool<T4> _pool4;
-    private readonly ComponentPool<T5> _pool5;
-
-    internal QueryItem(Entity entity, ComponentPool<T0> pool0, ComponentPool<T1> pool1, ComponentPool<T2> pool2, ComponentPool<T3> pool3, ComponentPool<T4> pool4, ComponentPool<T5> pool5)
-    {
-        _entity = entity;
-        _pool0 = pool0;
-        _pool1 = pool1;
-        _pool2 = pool2;
-        _pool3 = pool3;
-        _pool4 = pool4;
-        _pool5 = pool5;
-    }
-
-    public Entity Entity => _entity;
-
-    public ref T0 Component0 => ref _pool0.GetRef(_entity);
-    public ref T1 Component1 => ref _pool1.GetRef(_entity);
-    public ref T2 Component2 => ref _pool2.GetRef(_entity);
-    public ref T3 Component3 => ref _pool3.GetRef(_entity);
-    public ref T4 Component4 => ref _pool4.GetRef(_entity);
-    public ref T5 Component5 => ref _pool5.GetRef(_entity);
-
-    // Deconstruct into tuple-like values
-    public void Deconstruct(out Entity entity, out CompRef<T0> c0, out CompRef<T1> c1, out CompRef<T2> c2, out CompRef<T3> c3, out CompRef<T4> c4, out CompRef<T5> c5)
-    {
-        entity = _entity;
-
-        c0 = new(ref _pool0.GetRef(_entity));
-        c1 = new(ref _pool1.GetRef(_entity));
-        c2 = new(ref _pool2.GetRef(_entity));
-        c3 = new(ref _pool3.GetRef(_entity));
-        c4 = new(ref _pool4.GetRef(_entity));
-        c5 = new(ref _pool5.GetRef(_entity));
-    }
-}
-
-public readonly struct QueryItem<T0, T1, T2, T3, T4, T5, T6>
-    where T0 : unmanaged, IComponentData where T1 : unmanaged, IComponentData where T2 : unmanaged, IComponentData where T3 : unmanaged, IComponentData where T4 : unmanaged, IComponentData where T5 : unmanaged, IComponentData where T6 : unmanaged, IComponentData
-{
-    private readonly Entity _entity;
-    private readonly ComponentPool<T0> _pool0;
-    private readonly ComponentPool<T1> _pool1;
-    private readonly ComponentPool<T2> _pool2;
-    private readonly ComponentPool<T3> _pool3;
-    private readonly ComponentPool<T4> _pool4;
-    private readonly ComponentPool<T5> _pool5;
-    private readonly ComponentPool<T6> _pool6;
-
-    internal QueryItem(Entity entity, ComponentPool<T0> pool0, ComponentPool<T1> pool1, ComponentPool<T2> pool2, ComponentPool<T3> pool3, ComponentPool<T4> pool4, ComponentPool<T5> pool5, ComponentPool<T6> pool6)
-    {
-        _entity = entity;
-        _pool0 = pool0;
-        _pool1 = pool1;
-        _pool2 = pool2;
-        _pool3 = pool3;
-        _pool4 = pool4;
-        _pool5 = pool5;
-        _pool6 = pool6;
-    }
-
-    public Entity Entity => _entity;
-
-    public ref T0 Component0 => ref _pool0.GetRef(_entity);
-    public ref T1 Component1 => ref _pool1.GetRef(_entity);
-    public ref T2 Component2 => ref _pool2.GetRef(_entity);
-    public ref T3 Component3 => ref _pool3.GetRef(_entity);
-    public ref T4 Component4 => ref _pool4.GetRef(_entity);
-    public ref T5 Component5 => ref _pool5.GetRef(_entity);
-    public ref T6 Component6 => ref _pool6.GetRef(_entity);
-
-    // Deconstruct into tuple-like values
-    public void Deconstruct(out Entity entity, out CompRef<T0> c0, out CompRef<T1> c1, out CompRef<T2> c2, out CompRef<T3> c3, out CompRef<T4> c4, out CompRef<T5> c5, out CompRef<T6> c6)
-    {
-        entity = _entity;
-
-        c0 = new(ref _pool0.GetRef(_entity));
-        c1 = new(ref _pool1.GetRef(_entity));
-        c2 = new(ref _pool2.GetRef(_entity));
-        c3 = new(ref _pool3.GetRef(_entity));
-        c4 = new(ref _pool4.GetRef(_entity));
-        c5 = new(ref _pool5.GetRef(_entity));
-        c6 = new(ref _pool6.GetRef(_entity));
-    }
-}
-
-public readonly struct QueryItem<T0, T1, T2, T3, T4, T5, T6, T7>
-    where T0 : unmanaged, IComponentData where T1 : unmanaged, IComponentData where T2 : unmanaged, IComponentData where T3 : unmanaged, IComponentData where T4 : unmanaged, IComponentData where T5 : unmanaged, IComponentData where T6 : unmanaged, IComponentData where T7 : unmanaged, IComponentData
-{
-    private readonly Entity _entity;
-    private readonly ComponentPool<T0> _pool0;
-    private readonly ComponentPool<T1> _pool1;
-    private readonly ComponentPool<T2> _pool2;
-    private readonly ComponentPool<T3> _pool3;
-    private readonly ComponentPool<T4> _pool4;
-    private readonly ComponentPool<T5> _pool5;
-    private readonly ComponentPool<T6> _pool6;
-    private readonly ComponentPool<T7> _pool7;
-
-    internal QueryItem(Entity entity, ComponentPool<T0> pool0, ComponentPool<T1> pool1, ComponentPool<T2> pool2, ComponentPool<T3> pool3, ComponentPool<T4> pool4, ComponentPool<T5> pool5, ComponentPool<T6> pool6, ComponentPool<T7> pool7)
-    {
-        _entity = entity;
-        _pool0 = pool0;
-        _pool1 = pool1;
-        _pool2 = pool2;
-        _pool3 = pool3;
-        _pool4 = pool4;
-        _pool5 = pool5;
-        _pool6 = pool6;
-        _pool7 = pool7;
-    }
-
-    public Entity Entity => _entity;
-
-    public ref T0 Component0 => ref _pool0.GetRef(_entity);
-    public ref T1 Component1 => ref _pool1.GetRef(_entity);
-    public ref T2 Component2 => ref _pool2.GetRef(_entity);
-    public ref T3 Component3 => ref _pool3.GetRef(_entity);
-    public ref T4 Component4 => ref _pool4.GetRef(_entity);
-    public ref T5 Component5 => ref _pool5.GetRef(_entity);
-    public ref T6 Component6 => ref _pool6.GetRef(_entity);
-    public ref T7 Component7 => ref _pool7.GetRef(_entity);
-
-    // Deconstruct into tuple-like values
-    public void Deconstruct(out Entity entity, out CompRef<T0> c0, out CompRef<T1> c1, out CompRef<T2> c2, out CompRef<T3> c3, out CompRef<T4> c4, out CompRef<T5> c5, out CompRef<T6> c6, out CompRef<T7> c7)
-    {
-        entity = _entity;
-
-        c0 = new(ref _pool0.GetRef(_entity));
-        c1 = new(ref _pool1.GetRef(_entity));
-        c2 = new(ref _pool2.GetRef(_entity));
-        c3 = new(ref _pool3.GetRef(_entity));
-        c4 = new(ref _pool4.GetRef(_entity));
-        c5 = new(ref _pool5.GetRef(_entity));
-        c6 = new(ref _pool6.GetRef(_entity));
-        c7 = new(ref _pool7.GetRef(_entity));
-    }
-}
-

Ghost.Entities/Template/QueryItem.tt

@@ -1,61 +0,0 @@
-<#@ template language="C#" debug="false" hostspecific="true" #>
-<#@ assembly name="System.Core" #>
-<#@ import namespace="System.Linq" #>
-<#@ include file="Helpers.ttinclude" #>
-<#@ output extension=".cs" #>
-
-using Ghost.Entities.Components;
-using Ghost.Entities.Query;
-
-namespace Ghost.Entities;
-
-<# for (int arity = 1; arity <= Amount; arity++)
-{
-var generics = AppendGenerics(arity);
-var restrictions = AppendGenericRestrictions(arity, "unmanaged, IComponentData");
-var constructorParams = Enumerable.Range(0, arity)
-                                    .Select(i => $"ComponentPool<T{i}> pool{i}")
-                                    .Aggregate((a, b) => a + ", " + b);
-var deconstructParams = Enumerable.Range(0, arity)
-                                    .Select(i => {
-                                        var name = $"c{i}";
-                                        return arity == 1
-                                            ? $"out CompRef<T0> {name}"
-                                            : $"out CompRef<T{i}> {name}";
-                                    })
-                                    .Aggregate((a, b) => a + ", " + b);
-#>
-public readonly struct QueryItem<<#= generics #>>
-    <#= restrictions #>
-{
-    private readonly Entity _entity;
-<# for (int i = 0; i < arity; i++){ #>
-    private readonly ComponentPool<T<#= i #>> _pool<#= i #>;
-<# } #>
-
-    internal QueryItem(Entity entity, <#= constructorParams #>)
-    {
-        _entity = entity;
-<# for (int i = 0; i < arity; i++){ #>
-        _pool<#= i #> = pool<#= i #>;
-<# } #>
-    }
-
-    public Entity Entity => _entity;
-
-<# for (int i = 0; i < arity; i++){ #>
-    public ref T<#= i #> Component<#= i #> => ref _pool<#= i #>.GetRef(_entity);
-<# } #>
-
-    // Deconstruct into tuple-like values
-    public void Deconstruct(out Entity entity, <#= deconstructParams #>)
-    {
-        entity = _entity;
-
-<# for (int i = 0; i < arity; i++){ #>
-        c<#= i #> = new (ref _pool<#= i #>.GetRef(_entity));
-<# } #>
-    }
-}
-
-<# } #>

Ghost.Entities/Template/QueryRefComponent.cs

@@ -1,22 +0,0 @@
-
-
-using Ghost.Entities.Components;
-
-namespace Ghost.Entities;
-
-public delegate void QueryRefComponent<T0>(Entity entity, ref T0 t0Component)
-    where T0 : unmanaged, IComponentData;
-public delegate void QueryRefComponent<T0, T1>(Entity entity, ref T0 t0Component, ref T1 t1Component)
-    where T0 : unmanaged, IComponentData where T1 : unmanaged, IComponentData;
-public delegate void QueryRefComponent<T0, T1, T2>(Entity entity, ref T0 t0Component, ref T1 t1Component, ref T2 t2Component)
-    where T0 : unmanaged, IComponentData where T1 : unmanaged, IComponentData where T2 : unmanaged, IComponentData;
-public delegate void QueryRefComponent<T0, T1, T2, T3>(Entity entity, ref T0 t0Component, ref T1 t1Component, ref T2 t2Component, ref T3 t3Component)
-    where T0 : unmanaged, IComponentData where T1 : unmanaged, IComponentData where T2 : unmanaged, IComponentData where T3 : unmanaged, IComponentData;
-public delegate void QueryRefComponent<T0, T1, T2, T3, T4>(Entity entity, ref T0 t0Component, ref T1 t1Component, ref T2 t2Component, ref T3 t3Component, ref T4 t4Component)
-    where T0 : unmanaged, IComponentData where T1 : unmanaged, IComponentData where T2 : unmanaged, IComponentData where T3 : unmanaged, IComponentData where T4 : unmanaged, IComponentData;
-public delegate void QueryRefComponent<T0, T1, T2, T3, T4, T5>(Entity entity, ref T0 t0Component, ref T1 t1Component, ref T2 t2Component, ref T3 t3Component, ref T4 t4Component, ref T5 t5Component)
-    where T0 : unmanaged, IComponentData where T1 : unmanaged, IComponentData where T2 : unmanaged, IComponentData where T3 : unmanaged, IComponentData where T4 : unmanaged, IComponentData where T5 : unmanaged, IComponentData;
-public delegate void QueryRefComponent<T0, T1, T2, T3, T4, T5, T6>(Entity entity, ref T0 t0Component, ref T1 t1Component, ref T2 t2Component, ref T3 t3Component, ref T4 t4Component, ref T5 t5Component, ref T6 t6Component)
-    where T0 : unmanaged, IComponentData where T1 : unmanaged, IComponentData where T2 : unmanaged, IComponentData where T3 : unmanaged, IComponentData where T4 : unmanaged, IComponentData where T5 : unmanaged, IComponentData where T6 : unmanaged, IComponentData;
-public delegate void QueryRefComponent<T0, T1, T2, T3, T4, T5, T6, T7>(Entity entity, ref T0 t0Component, ref T1 t1Component, ref T2 t2Component, ref T3 t3Component, ref T4 t4Component, ref T5 t5Component, ref T6 t6Component, ref T7 t7Component)
-    where T0 : unmanaged, IComponentData where T1 : unmanaged, IComponentData where T2 : unmanaged, IComponentData where T3 : unmanaged, IComponentData where T4 : unmanaged, IComponentData where T5 : unmanaged, IComponentData where T6 : unmanaged, IComponentData where T7 : unmanaged, IComponentData;

Ghost.Entities/Template/QueryRefComponent.tt

@@ -1,21 +0,0 @@
-<#@ template language="C#" #>
-<#@ output extension=".cs" #>
-<#@ import namespace="System.Text" #>
-<#@ include file="Helpers.ttinclude" #>
-
-using Ghost.Entities.Components;
-
-namespace Ghost.Entities;
-
-<#
-for (var index = 1; index <= Amount; index++)
-{
-    var generics = AppendGenerics(index);
-    var parameters = AppendGenericRefParameters(index);
-    var restrictions = AppendGenericRestrictions(index, "unmanaged, IComponentData");
-#>
-public delegate void QueryRefComponent<<#= generics #>>(Entity entity, <#= parameters.ToString() #>)
-    <#= restrictions.ToString() #>;
-<#
-}
-#>

Ghost.Entities/Template/World.Query.cs

@@ -1,242 +0,0 @@
-
-
-using Ghost.Entities.Components;
-using Ghost.Entities.Query;
-
-namespace Ghost.Entities;
-
-public partial class World
-{
-    public QueryEnumerable<T0> Query<T0>()
-        where T0 : unmanaged, IComponentData
-    {
-        if (!(_componentStorage.TryGetPool<T0>(out var pool0)))
-        {
-            return default;
-        }
-
-        return new QueryEnumerable<T0>(
-            this,
-            pool0,
-            pool0.Count);
-    }
-
-    public QueryEnumerable<T0> QueryFilter<T0>(ref readonly QueryFilter filter)
-        where T0 : unmanaged, IComponentData
-    {
-        if (!(_componentStorage.TryGetPool<T0>(out var pool0)))
-        {
-            return default;
-        }
-
-        return new QueryEnumerable<T0>(
-            this,
-            pool0,
-            pool0.Count,
-            in filter);
-    }
-
-    public QueryEnumerable<T0, T1> Query<T0, T1>()
-        where T0 : unmanaged, IComponentData where T1 : unmanaged, IComponentData
-    {
-        if (!(_componentStorage.TryGetPool<T0>(out var pool0) && _componentStorage.TryGetPool<T1>(out var pool1)))
-        {
-            return default;
-        }
-
-        return new QueryEnumerable<T0, T1>(
-            this,
-            pool0, pool1,
-            pool0.Count);
-    }
-
-    public QueryEnumerable<T0, T1> QueryFilter<T0, T1>(ref readonly QueryFilter filter)
-        where T0 : unmanaged, IComponentData where T1 : unmanaged, IComponentData
-    {
-        if (!(_componentStorage.TryGetPool<T0>(out var pool0) && _componentStorage.TryGetPool<T1>(out var pool1)))
-        {
-            return default;
-        }
-
-        return new QueryEnumerable<T0, T1>(
-            this,
-            pool0, pool1,
-            pool0.Count,
-            in filter);
-    }
-
-    public QueryEnumerable<T0, T1, T2> Query<T0, T1, T2>()
-        where T0 : unmanaged, IComponentData where T1 : unmanaged, IComponentData where T2 : unmanaged, IComponentData
-    {
-        if (!(_componentStorage.TryGetPool<T0>(out var pool0) && _componentStorage.TryGetPool<T1>(out var pool1) && _componentStorage.TryGetPool<T2>(out var pool2)))
-        {
-            return default;
-        }
-
-        return new QueryEnumerable<T0, T1, T2>(
-            this,
-            pool0, pool1, pool2,
-            pool0.Count);
-    }
-
-    public QueryEnumerable<T0, T1, T2> QueryFilter<T0, T1, T2>(ref readonly QueryFilter filter)
-        where T0 : unmanaged, IComponentData where T1 : unmanaged, IComponentData where T2 : unmanaged, IComponentData
-    {
-        if (!(_componentStorage.TryGetPool<T0>(out var pool0) && _componentStorage.TryGetPool<T1>(out var pool1) && _componentStorage.TryGetPool<T2>(out var pool2)))
-        {
-            return default;
-        }
-
-        return new QueryEnumerable<T0, T1, T2>(
-            this,
-            pool0, pool1, pool2,
-            pool0.Count,
-            in filter);
-    }
-
-    public QueryEnumerable<T0, T1, T2, T3> Query<T0, T1, T2, T3>()
-        where T0 : unmanaged, IComponentData where T1 : unmanaged, IComponentData where T2 : unmanaged, IComponentData where T3 : unmanaged, IComponentData
-    {
-        if (!(_componentStorage.TryGetPool<T0>(out var pool0) && _componentStorage.TryGetPool<T1>(out var pool1) && _componentStorage.TryGetPool<T2>(out var pool2) && _componentStorage.TryGetPool<T3>(out var pool3)))
-        {
-            return default;
-        }
-
-        return new QueryEnumerable<T0, T1, T2, T3>(
-            this,
-            pool0, pool1, pool2, pool3,
-            pool0.Count);
-    }
-
-    public QueryEnumerable<T0, T1, T2, T3> QueryFilter<T0, T1, T2, T3>(ref readonly QueryFilter filter)
-        where T0 : unmanaged, IComponentData where T1 : unmanaged, IComponentData where T2 : unmanaged, IComponentData where T3 : unmanaged, IComponentData
-    {
-        if (!(_componentStorage.TryGetPool<T0>(out var pool0) && _componentStorage.TryGetPool<T1>(out var pool1) && _componentStorage.TryGetPool<T2>(out var pool2) && _componentStorage.TryGetPool<T3>(out var pool3)))
-        {
-            return default;
-        }
-
-        return new QueryEnumerable<T0, T1, T2, T3>(
-            this,
-            pool0, pool1, pool2, pool3,
-            pool0.Count,
-            in filter);
-    }
-
-    public QueryEnumerable<T0, T1, T2, T3, T4> Query<T0, T1, T2, T3, T4>()
-        where T0 : unmanaged, IComponentData where T1 : unmanaged, IComponentData where T2 : unmanaged, IComponentData where T3 : unmanaged, IComponentData where T4 : unmanaged, IComponentData
-    {
-        if (!(_componentStorage.TryGetPool<T0>(out var pool0) && _componentStorage.TryGetPool<T1>(out var pool1) && _componentStorage.TryGetPool<T2>(out var pool2) && _componentStorage.TryGetPool<T3>(out var pool3) && _componentStorage.TryGetPool<T4>(out var pool4)))
-        {
-            return default;
-        }
-
-        return new QueryEnumerable<T0, T1, T2, T3, T4>(
-            this,
-            pool0, pool1, pool2, pool3, pool4,
-            pool0.Count);
-    }
-
-    public QueryEnumerable<T0, T1, T2, T3, T4> QueryFilter<T0, T1, T2, T3, T4>(ref readonly QueryFilter filter)
-        where T0 : unmanaged, IComponentData where T1 : unmanaged, IComponentData where T2 : unmanaged, IComponentData where T3 : unmanaged, IComponentData where T4 : unmanaged, IComponentData
-    {
-        if (!(_componentStorage.TryGetPool<T0>(out var pool0) && _componentStorage.TryGetPool<T1>(out var pool1) && _componentStorage.TryGetPool<T2>(out var pool2) && _componentStorage.TryGetPool<T3>(out var pool3) && _componentStorage.TryGetPool<T4>(out var pool4)))
-        {
-            return default;
-        }
-
-        return new QueryEnumerable<T0, T1, T2, T3, T4>(
-            this,
-            pool0, pool1, pool2, pool3, pool4,
-            pool0.Count,
-            in filter);
-    }
-
-    public QueryEnumerable<T0, T1, T2, T3, T4, T5> Query<T0, T1, T2, T3, T4, T5>()
-        where T0 : unmanaged, IComponentData where T1 : unmanaged, IComponentData where T2 : unmanaged, IComponentData where T3 : unmanaged, IComponentData where T4 : unmanaged, IComponentData where T5 : unmanaged, IComponentData
-    {
-        if (!(_componentStorage.TryGetPool<T0>(out var pool0) && _componentStorage.TryGetPool<T1>(out var pool1) && _componentStorage.TryGetPool<T2>(out var pool2) && _componentStorage.TryGetPool<T3>(out var pool3) && _componentStorage.TryGetPool<T4>(out var pool4) && _componentStorage.TryGetPool<T5>(out var pool5)))
-        {
-            return default;
-        }
-
-        return new QueryEnumerable<T0, T1, T2, T3, T4, T5>(
-            this,
-            pool0, pool1, pool2, pool3, pool4, pool5,
-            pool0.Count);
-    }
-
-    public QueryEnumerable<T0, T1, T2, T3, T4, T5> QueryFilter<T0, T1, T2, T3, T4, T5>(ref readonly QueryFilter filter)
-        where T0 : unmanaged, IComponentData where T1 : unmanaged, IComponentData where T2 : unmanaged, IComponentData where T3 : unmanaged, IComponentData where T4 : unmanaged, IComponentData where T5 : unmanaged, IComponentData
-    {
-        if (!(_componentStorage.TryGetPool<T0>(out var pool0) && _componentStorage.TryGetPool<T1>(out var pool1) && _componentStorage.TryGetPool<T2>(out var pool2) && _componentStorage.TryGetPool<T3>(out var pool3) && _componentStorage.TryGetPool<T4>(out var pool4) && _componentStorage.TryGetPool<T5>(out var pool5)))
-        {
-            return default;
-        }
-
-        return new QueryEnumerable<T0, T1, T2, T3, T4, T5>(
-            this,
-            pool0, pool1, pool2, pool3, pool4, pool5,
-            pool0.Count,
-            in filter);
-    }
-
-    public QueryEnumerable<T0, T1, T2, T3, T4, T5, T6> Query<T0, T1, T2, T3, T4, T5, T6>()
-        where T0 : unmanaged, IComponentData where T1 : unmanaged, IComponentData where T2 : unmanaged, IComponentData where T3 : unmanaged, IComponentData where T4 : unmanaged, IComponentData where T5 : unmanaged, IComponentData where T6 : unmanaged, IComponentData
-    {
-        if (!(_componentStorage.TryGetPool<T0>(out var pool0) && _componentStorage.TryGetPool<T1>(out var pool1) && _componentStorage.TryGetPool<T2>(out var pool2) && _componentStorage.TryGetPool<T3>(out var pool3) && _componentStorage.TryGetPool<T4>(out var pool4) && _componentStorage.TryGetPool<T5>(out var pool5) && _componentStorage.TryGetPool<T6>(out var pool6)))
-        {
-            return default;
-        }
-
-        return new QueryEnumerable<T0, T1, T2, T3, T4, T5, T6>(
-            this,
-            pool0, pool1, pool2, pool3, pool4, pool5, pool6,
-            pool0.Count);
-    }
-
-    public QueryEnumerable<T0, T1, T2, T3, T4, T5, T6> QueryFilter<T0, T1, T2, T3, T4, T5, T6>(ref readonly QueryFilter filter)
-        where T0 : unmanaged, IComponentData where T1 : unmanaged, IComponentData where T2 : unmanaged, IComponentData where T3 : unmanaged, IComponentData where T4 : unmanaged, IComponentData where T5 : unmanaged, IComponentData where T6 : unmanaged, IComponentData
-    {
-        if (!(_componentStorage.TryGetPool<T0>(out var pool0) && _componentStorage.TryGetPool<T1>(out var pool1) && _componentStorage.TryGetPool<T2>(out var pool2) && _componentStorage.TryGetPool<T3>(out var pool3) && _componentStorage.TryGetPool<T4>(out var pool4) && _componentStorage.TryGetPool<T5>(out var pool5) && _componentStorage.TryGetPool<T6>(out var pool6)))
-        {
-            return default;
-        }
-
-        return new QueryEnumerable<T0, T1, T2, T3, T4, T5, T6>(
-            this,
-            pool0, pool1, pool2, pool3, pool4, pool5, pool6,
-            pool0.Count,
-            in filter);
-    }
-
-    public QueryEnumerable<T0, T1, T2, T3, T4, T5, T6, T7> Query<T0, T1, T2, T3, T4, T5, T6, T7>()
-        where T0 : unmanaged, IComponentData where T1 : unmanaged, IComponentData where T2 : unmanaged, IComponentData where T3 : unmanaged, IComponentData where T4 : unmanaged, IComponentData where T5 : unmanaged, IComponentData where T6 : unmanaged, IComponentData where T7 : unmanaged, IComponentData
-    {
-        if (!(_componentStorage.TryGetPool<T0>(out var pool0) && _componentStorage.TryGetPool<T1>(out var pool1) && _componentStorage.TryGetPool<T2>(out var pool2) && _componentStorage.TryGetPool<T3>(out var pool3) && _componentStorage.TryGetPool<T4>(out var pool4) && _componentStorage.TryGetPool<T5>(out var pool5) && _componentStorage.TryGetPool<T6>(out var pool6) && _componentStorage.TryGetPool<T7>(out var pool7)))
-        {
-            return default;
-        }
-
-        return new QueryEnumerable<T0, T1, T2, T3, T4, T5, T6, T7>(
-            this,
-            pool0, pool1, pool2, pool3, pool4, pool5, pool6, pool7,
-            pool0.Count);
-    }
-
-    public QueryEnumerable<T0, T1, T2, T3, T4, T5, T6, T7> QueryFilter<T0, T1, T2, T3, T4, T5, T6, T7>(ref readonly QueryFilter filter)
-        where T0 : unmanaged, IComponentData where T1 : unmanaged, IComponentData where T2 : unmanaged, IComponentData where T3 : unmanaged, IComponentData where T4 : unmanaged, IComponentData where T5 : unmanaged, IComponentData where T6 : unmanaged, IComponentData where T7 : unmanaged, IComponentData
-    {
-        if (!(_componentStorage.TryGetPool<T0>(out var pool0) && _componentStorage.TryGetPool<T1>(out var pool1) && _componentStorage.TryGetPool<T2>(out var pool2) && _componentStorage.TryGetPool<T3>(out var pool3) && _componentStorage.TryGetPool<T4>(out var pool4) && _componentStorage.TryGetPool<T5>(out var pool5) && _componentStorage.TryGetPool<T6>(out var pool6) && _componentStorage.TryGetPool<T7>(out var pool7)))
-        {
-            return default;
-        }
-
-        return new QueryEnumerable<T0, T1, T2, T3, T4, T5, T6, T7>(
-            this,
-            pool0, pool1, pool2, pool3, pool4, pool5, pool6, pool7,
-            pool0.Count,
-            in filter);
-    }
-
-}

Ghost.Entities/Template/World.Query.tt

@@ -1,54 +0,0 @@
-<#@ template language="C#" #>
-<#@ output extension=".cs" #>
-<#@ assembly name="System.Core" #>
-<#@ import namespace="System.Linq" #>
-<#@ import namespace="System.Text" #>
-<#@ include file="Helpers.ttinclude" #>
-
-using Ghost.Entities.Components;
-using Ghost.Entities.Query;
-
-namespace Ghost.Entities;
-
-public partial class World
-{
-<# for (var index = 1; index <= Amount; index++) {
-    var generics  = AppendGenerics(index);
-    var restrictions = AppendGenericRestrictions(index, "unmanaged, IComponentData");
-    var tryGetPools = TryGetComponentPools(index);
-    var poolParams = Enumerable.Range(0, index)
-                                      .Select(i => $"pool{i}")
-                                      .Aggregate((a,b)=> a + ", " + b);
-    var countSource = "pool0.Count";
-#>
-    public QueryEnumerable<<#= generics #>> Query<<#= generics #>>()
-        <#= restrictions #>
-    {
-        if (!(<#= tryGetPools #>))
-        {
-            return default;
-        }
-
-        return new QueryEnumerable<<#= generics #>>(
-            this,
-            <#= poolParams #>,
-            <#= countSource #>);
-    }
-
-    public QueryEnumerable<<#= generics #>> QueryFilter<<#= generics #>>(ref readonly QueryFilter filter) 
-        <#= restrictions #>
-    {
-        if (!(<#= tryGetPools #>))
-        {
-            return default;
-        }
-
-        return new QueryEnumerable<<#= generics #>>(
-            this,
-            <#= poolParams #>,
-            <#= countSource #>,
-            in filter);
-    }
-
-<# } #>
-}

Ghost.Entities/Templates/EntityQuery.ComponentIterator.tt

@@ -0,0 +1,228 @@
+<#@ template language="C#" #>
+<#@ output extension="gen.cs" #>
+<#@ assembly name="System.Core" #>
+<#@ import namespace="System.Linq" #>
+<#@ import namespace="System.Text" #>
+<#@ include file="Helpers.ttinclude" #>
+using Ghost.Core;
+using Misaki.HighPerformance.LowLevel;
+using Misaki.HighPerformance.LowLevel.Buffer;
+using Misaki.HighPerformance.LowLevel.Collections;
+using System.Runtime.CompilerServices;
+
+namespace Ghost.Entities;
+
+public unsafe partial struct EntityQuery
+{
+<# for (var i = 1; i <= Amount; i++)
+{
+    var generics = AppendParameters(i, "T{0}");
+    var compGenerics = AppendParameters(i, "ref T{0} component{0}");
+    var deconstrictOutPrams = AppendParameters(i, "out Ref<T{0}> component{0}");
+    var restrictions = AppendGenericRestrictionsMultiline(i, "unmanaged, IComponent", 2);
+#>
+    public readonly ref struct ComponentIterator<<#= generics#>>
+<#= restrictions #>
+    {
+<# if (i > 1) { #>
+        public ref struct QueryItem
+        {
+<# for (var j = 0; j < i; j++) { #>
+            public ref T<#= j #> component<#= j #>;
+<# } #>
+            internal QueryItem(<#= compGenerics #>)
+            {
+<# for (var j = 0; j < i; j++) { #>
+                this.component<#= j #> = ref component<#= j #>;
+<# } #>
+            }
+
+            public void Deconstruct(<#= deconstrictOutPrams #>)
+            {
+<# for (var j = 0; j < i; j++) { #>
+                component<#= j #> = new Ref<T<#= j #>>(ref this.component<#= j #>);
+<# } #>
+            }
+        }
+
+<# } #>
+        public ref struct Enumerator : IDisposable
+        {
+            private fixed int _compTypeIDs[<#= i #>];
+            private fixed int _offsets[<#= i #>];
+            private fixed long _compBasePtrs[<#= i #>];
+
+            private readonly ReadOnlyUnsafeCollection<Identifier<Archetype>> _matchingArchetypes;
+            private readonly EntityQueryMask _mask;
+            private readonly World _world;
+
+            private readonly Stack.Scope _scope;
+            private UnsafeList<int> _changedComponentIDs;
+
+            private ref Archetype _currentArchetype;
+            private ref Chunk _currentChunk;
+            private byte* _chunkBasePtr;
+
+            private int _currentChunkEntityCount;
+            private int _currentArchetypeIndex;
+            private int _currentChunkIndex;
+            private int _currentEntityIndex;
+
+            internal Enumerator(ReadOnlyUnsafeCollection<Identifier<Archetype>> matchingArchetypes, EntityQueryMask mask, World world)
+            {
+<# for (var j = 0; j < i; j++) { #>
+                _compTypeIDs[<#= j #>] = ComponentTypeID<T<#= j #>>.value;
+                _offsets[<#= j #>] = 0;
+                _compBasePtrs[<#= j #>] = 0;
+
+<# } #>
+                _matchingArchetypes = matchingArchetypes;
+                _mask = mask;
+                _world = world;
+
+                _scope = AllocationManager.CreateStackScope();
+                _changedComponentIDs = new UnsafeList<int>(<#= i #>, _scope.AllocationHandle);
+
+                var it = _mask.writeAccess.GetIterator();
+                while (it.Next(out var id))
+                {
+                    for (var i = 0; i < <#= i #>; i++)
+                    {
+                        if (id == _compTypeIDs[i])
+                        {
+                            _changedComponentIDs.Add(id);
+                            break;
+                        }
+                    }
+                }
+
+                Reset();
+            }
+
+<# if (i > 1) { #>
+            public QueryItem Current => new(
+<# for (var j = 0; j < i; j++) { #>
+                ref *(T<#= j #>*)(_compBasePtrs[<#= j #>] + _currentEntityIndex * sizeof(T<#= j #>))<#= j < i - 1 ? "," : "" #>
+<# } #>
+            );
+<# } else { #>
+            public ref T0 Current => ref *(T0*)(_compBasePtrs[0] + _currentEntityIndex * sizeof(T0));
+<# } #>
+
+            [MethodImpl(MethodImplOptions.AggressiveInlining)]
+            private void SetChunk(int chunkIndex)
+            {
+                _currentChunk = ref _currentArchetype.GetChunkReference(chunkIndex);
+                _chunkBasePtr = _currentChunk.GetUnsafePtr();
+                _currentChunkEntityCount = _currentChunk._count;
+
+                for (var index = 0; index < <#= i #>; index++)
+                {
+                    var layout = _currentArchetype.GetLayout(_compTypeIDs[index])
+                        .GetValueOrThrow();
+                    _offsets[index] = layout.offset;
+                    _compBasePtrs[index] = (long)(_chunkBasePtr + _offsets[index]);
+                }
+
+                for (var i = 0; i < _changedComponentIDs.Count; i++)
+                {
+                    _currentArchetype.MarkChanged(_currentChunkIndex, _changedComponentIDs[i], _world.Version);
+                }
+            }
+
+            public bool MoveNext()
+            {
+                while (true)
+                {
+                    _currentEntityIndex++;
+                    if (_currentEntityIndex < _currentChunk._count)
+                    {
+                        var pChunkData = _currentChunk.GetUnsafePtr();
+                        if (IsEntityValid(pChunkData, _currentEntityIndex, in _currentArchetype, in _mask))
+                        {
+                            return true;
+                        }
+
+                        continue;
+                    }
+
+                    _currentChunkIndex++;
+                    if (!Unsafe.IsNullRef(ref _currentArchetype) && _currentChunkIndex < _currentArchetype.ChunkCount)
+                    {
+                        SetChunk(_currentChunkIndex);
+                        _currentEntityIndex = -1; // Reset for new chunk
+
+                        continue;
+                    }
+
+                    _currentArchetypeIndex++;
+                    if (_currentArchetypeIndex < _matchingArchetypes.Count)
+                    {
+                        _currentArchetype = ref _world.GetArchetypeReference(_matchingArchetypes[_currentArchetypeIndex]);
+
+                        _currentChunkIndex = 0;
+                        if (_currentArchetype.ChunkCount > 0)
+                        {
+                            SetChunk(0);
+                            _currentEntityIndex = -1;
+                            continue;
+                        }
+
+                        // If archetype has no chunks, loop will try next archetype
+                    }
+                    else
+                    {
+                        return false; // End of all data
+                    }
+                }
+            }
+
+            public void Reset()
+            {
+                _currentArchetype = ref Unsafe.NullRef<Archetype>();
+                _currentChunk = ref Unsafe.NullRef<Chunk>();
+                _currentArchetypeIndex = 0;
+                _currentChunkIndex = 0;
+                _currentEntityIndex = -1;
+
+                if (_matchingArchetypes.Count > 0)
+                {
+                    _currentArchetype = ref _world.GetArchetypeReference(_matchingArchetypes[0]);
+                    if (_currentArchetype.ChunkCount > 0)
+                    {
+                        SetChunk(0);
+                    }
+                }
+            }
+
+            public readonly void Dispose()
+            {
+                _scope.Dispose();
+            }
+        }
+
+        private readonly ReadOnlyUnsafeCollection<Identifier<Archetype>> _matchingArchetypes;
+        private readonly EntityQueryMask _mask;
+        private readonly World _world;
+
+        internal ComponentIterator(ReadOnlyUnsafeCollection<Identifier<Archetype>> matchingArchetypes, EntityQueryMask mask, World world)
+        {
+            _matchingArchetypes = matchingArchetypes;
+            _mask = mask;
+            _world = world;
+        }
+
+        public Enumerator GetEnumerator()
+        {
+            return new Enumerator(_matchingArchetypes, _mask, _world);
+        }
+    }
+
+    public readonly ComponentIterator<<#= generics#>> GetComponentIterator<<#= generics#>>()
+<#= restrictions #>
+    {
+        return new ComponentIterator<<#= generics#>>(_matchingArchetypes.AsReadOnly(), _mask, World.GetWorld(_worldID).GetValueOrThrow());
+    }
+
+<# } #>
+}

Ghost.Entities/Templates/EntityQuery.EntityComponentIterator.tt

@@ -0,0 +1,229 @@
+<#@ template language="C#" #>
+<#@ output extension="gen.cs" #>
+<#@ assembly name="System.Core" #>
+<#@ import namespace="System.Linq" #>
+<#@ import namespace="System.Text" #>
+<#@ include file="Helpers.ttinclude" #>
+using Ghost.Core;
+using Misaki.HighPerformance.LowLevel;
+using Misaki.HighPerformance.LowLevel.Buffer;
+using Misaki.HighPerformance.LowLevel.Collections;
+using System.Runtime.CompilerServices;
+
+namespace Ghost.Entities;
+
+public unsafe partial struct EntityQuery
+{
+<# for (var i = 1; i <= Amount; i++)
+{
+    var generics = AppendParameters(i, "T{0}");
+    var compGenerics = AppendParameters(i, "ref T{0} component{0}");
+    var deconstrictOutPrams = AppendParameters(i, "out Ref<T{0}> component{0}");
+    var restrictions = AppendGenericRestrictionsMultiline(i, "unmanaged, IComponent", 2);
+#>
+    public readonly ref struct EntityComponentIterator<<#= generics #>>
+<#= restrictions #>
+    {
+        public ref struct QueryItem
+        {
+            public Entity entity;
+
+<# for (var j = 0; j < i; j++) { #>
+            public ref T<#= j #> component<#= j #>;
+<# } #>
+            internal QueryItem(Entity entity, <#= compGenerics #>)
+            {
+                this.entity = entity;
+
+<# for (var j = 0; j < i; j++) { #>
+                this.component<#= j #> = ref component<#= j #>;
+<# } #>
+            }
+
+            public void Deconstruct(out Entity entity, <#= deconstrictOutPrams #>)
+            {
+                entity = this.entity;
+
+<# for (var j = 0; j < i; j++) { #>
+                component<#= j #> = new Ref<T<#= j #>>(ref this.component<#= j #>);
+<# } #>
+            }
+        }
+
+        public ref struct Enumerator : IDisposable
+        {
+            private fixed int _compTypeIDs[<#= i #>];
+            private fixed int _offsets[<#= i #>];
+            private fixed long _compBasePtrs[<#= i #>];
+
+            private readonly ReadOnlyUnsafeCollection<Identifier<Archetype>> _matchingArchetypes;
+            private readonly EntityQueryMask _mask;
+            private readonly World _world;
+
+            private readonly Stack.Scope _scope;
+            private UnsafeList<int> _changedComponentIDs;
+
+            private ref Archetype _currentArchetype;
+            private ref Chunk _currentChunk;
+            private byte* _chunkBasePtr;
+
+            private int _currentChunkEntityCount;
+            private int _currentArchetypeIndex;
+            private int _currentChunkIndex;
+            private int _currentEntityIndex;
+
+            internal Enumerator(ReadOnlyUnsafeCollection<Identifier<Archetype>> matchingArchetypes, EntityQueryMask mask, World world)
+            {
+<# for (var j = 0; j < i; j++) { #>
+                _compTypeIDs[<#= j #>] = ComponentTypeID<T<#= j #>>.value;
+                _offsets[<#= j #>] = 0;
+                _compBasePtrs[<#= j #>] = 0;
+
+<# } #>
+                _matchingArchetypes = matchingArchetypes;
+                _mask = mask;
+                _world = world;
+
+                _scope = AllocationManager.CreateStackScope();
+                _changedComponentIDs = new UnsafeList<int>(<#= i #>, _scope.AllocationHandle);
+
+                var it = _mask.writeAccess.GetIterator();
+                while (it.Next(out var id))
+                {
+                    for (var i = 0; i < <#= i #>; i++)
+                    {
+                        if (id == _compTypeIDs[i])
+                        {
+                            _changedComponentIDs.Add(id);
+                            break;
+                        }
+                    }
+                }
+
+                Reset();
+            }
+
+            public QueryItem Current => new(
+                *(Entity*)(_chunkBasePtr + _currentArchetype.EntityIDsOffset + _currentEntityIndex * sizeof(Entity)),
+<# for (var j = 0; j < i; j++) { #>
+                ref *(T<#= j #>*)(_compBasePtrs[<#= j #>] + _currentEntityIndex * sizeof(T<#= j #>))<#= j < i - 1 ? "," : "" #>
+<# } #>
+            );
+
+            [MethodImpl(MethodImplOptions.AggressiveInlining)]
+            private void SetChunk(int chunkIndex)
+            {
+                _currentChunk = ref _currentArchetype.GetChunkReference(chunkIndex);
+                _chunkBasePtr = _currentChunk.GetUnsafePtr();
+                _currentChunkEntityCount = _currentChunk._count;
+
+                for (var index = 0; index < <#= i #>; index++)
+                {
+                    var layout = _currentArchetype.GetLayout(_compTypeIDs[index])
+                        .GetValueOrThrow();
+                    _offsets[index] = layout.offset;
+                    _compBasePtrs[index] = (long)(_chunkBasePtr + _offsets[index]);
+                }
+
+                for (var i = 0; i < _changedComponentIDs.Count; i++)
+                {
+                    _currentArchetype.MarkChanged(_currentChunkIndex, _changedComponentIDs[i], _world.Version);
+                }
+            }
+
+            public bool MoveNext()
+            {
+                while (true)
+                {
+                    _currentEntityIndex++;
+                    if (_currentEntityIndex < _currentChunk._count)
+                    {
+                        var pChunkData = _currentChunk.GetUnsafePtr();
+                        if (IsEntityValid(pChunkData, _currentEntityIndex, in _currentArchetype, in _mask))
+                        {
+                            return true;
+                        }
+
+                        continue;
+                    }
+
+                    _currentChunkIndex++;
+                    if (!Unsafe.IsNullRef(ref _currentArchetype) && _currentChunkIndex < _currentArchetype.ChunkCount)
+                    {
+                        SetChunk(_currentChunkIndex);
+                        _currentEntityIndex = -1; // Reset for new chunk
+
+                        continue;
+                    }
+
+                    _currentArchetypeIndex++;
+                    if (_currentArchetypeIndex < _matchingArchetypes.Count)
+                    {
+                        _currentArchetype = ref _world.GetArchetypeReference(_matchingArchetypes[_currentArchetypeIndex]);
+
+                        _currentChunkIndex = 0;
+                        if (_currentArchetype.ChunkCount > 0)
+                        {
+                            SetChunk(0);
+                            _currentEntityIndex = -1;
+                            continue;
+                        }
+
+                        // If archetype has no chunks, loop will try next archetype
+                    }
+                    else
+                    {
+                        return false; // End of all data
+                    }
+                }
+            }
+
+            public void Reset()
+            {
+                _currentArchetype = ref Unsafe.NullRef<Archetype>();
+                _currentChunk = ref Unsafe.NullRef<Chunk>();
+                _currentArchetypeIndex = 0;
+                _currentChunkIndex = 0;
+                _currentEntityIndex = -1;
+
+                if (_matchingArchetypes.Count > 0)
+                {
+                    _currentArchetype = ref _world.GetArchetypeReference(_matchingArchetypes[0]);
+                    if (_currentArchetype.ChunkCount > 0)
+                    {
+                        SetChunk(0);
+                    }
+                }
+            }
+
+            public readonly void Dispose()
+            {
+                _scope.Dispose();
+            }
+        }
+
+        private readonly ReadOnlyUnsafeCollection<Identifier<Archetype>> _matchingArchetypes;
+        private readonly EntityQueryMask _mask;
+        private readonly World _world;
+
+        internal EntityComponentIterator(ReadOnlyUnsafeCollection<Identifier<Archetype>> matchingArchetypes, EntityQueryMask mask, World world)
+        {
+            _matchingArchetypes = matchingArchetypes;
+            _mask = mask;
+            _world = world;
+        }
+
+        public Enumerator GetEnumerator()
+        {
+            return new Enumerator(_matchingArchetypes, _mask, _world);
+        }
+    }
+
+    public readonly EntityComponentIterator<<#= generics#>> GetEntityComponentIterator<<#= generics#>>()
+<#= restrictions #>
+    {
+        return new EntityComponentIterator<<#= generics#>>(_matchingArchetypes.AsReadOnly(), _mask, World.GetWorld(_worldID).GetValueOrThrow());
+    }
+
+<# } #>
+}

Ghost.Entities/Templates/EntityQuery.ForEach.tt

@@ -0,0 +1,119 @@
+<#@ template language="C#" #>
+<#@ output extension="gen.cs" #>
+<#@ assembly name="System.Core" #>
+<#@ import namespace="System.Linq" #>
+<#@ import namespace="System.Text" #>
+<#@ include file="Helpers.ttinclude" #>
+namespace Ghost.Entities;
+
+public unsafe partial struct EntityQuery
+{
+<# for (var f = 0; f < 2; f++)
+{
+    var isForEachWithEntity = f != 0;
+#>
+<# for (var i = 1; i <= Amount; i++)
+{
+    var generics = AppendParameters(i, "T{0}");
+    var restrictions = AppendGenericRestrictionsMultiline(i, "unmanaged, IComponent", 2);
+
+    var delegateTupe = isForEachWithEntity ? "ForEachWithEntity" : "ForEach";
+#>
+    public readonly void ForEach<<#= generics #>>(<#= delegateTupe #><<#= generics #>> action)
+<#= restrictions #>
+    {
+        var world = World.GetWorldUncheck(_worldID);
+        var globalVersion = world.Version;
+
+<# for (var localIndex = 0; localIndex < i; localIndex++) { #>
+        var comp<#= localIndex #>TypeID = ComponentTypeID<T<#= localIndex #>>.value;
+<# } #>
+
+        var compTypeIDs = stackalloc int[]
+        {
+<# for (var localIndex = 0; localIndex < i; localIndex++) { #>
+            comp<#= localIndex #>TypeID.value,
+<# } #>
+        };
+
+        var changedCompIDs = stackalloc int[<#= i #>];
+        var offsets = stackalloc int[<#= i #>];
+        var basePtrs = stackalloc byte*[<#= i #>];
+
+        var changedCompCount = 0;
+
+        var it = _mask.writeAccess.GetIterator();
+        while (it.Next(out var id))
+        {
+            for (var i =0; i < <#= i #>; i++)
+            {
+                if (id == compTypeIDs[i])
+                {
+                    changedCompIDs[changedCompCount] = id;
+                    changedCompCount++;
+                    break;
+                }
+            }
+        }
+
+        for (var i = 0; i < _matchingArchetypes.Count; i++)
+        {
+            ref var archetype = ref world.GetArchetypeReference(_matchingArchetypes[i]);
+            var hasAllComponents = true;
+            for (var index = 0; index < <#= i #>; index++)
+            {
+                var layoutResult = archetype.GetLayout(compTypeIDs[index]);
+                if (!layoutResult)
+                {
+                    hasAllComponents = false;
+                    break;
+                }
+
+                offsets[index] = layoutResult.Value.offset;
+            }
+
+            if (!hasAllComponents)
+            {
+                continue;
+            }
+
+            for (var chunkIndex = 0; chunkIndex < archetype.ChunkCount; chunkIndex++)
+            {
+                ref var chunk = ref archetype.GetChunkReference(chunkIndex);
+                var pChunkData = chunk.GetUnsafePtr();
+
+                for (var j = 0; j < changedCompCount; j++)
+                {
+                    archetype.MarkChanged(chunkIndex, changedCompIDs[j], globalVersion);
+                }
+
+                for (var index = 0; index < <#= i #>; index++)
+                {
+                    basePtrs[index] = pChunkData + offsets[index];
+                }
+
+                for (var entityIndex = 0; entityIndex < chunk._count; entityIndex++)
+                {
+                    if (!IsEntityValid(pChunkData, entityIndex, in archetype, in _mask))
+                    {
+                        continue;
+                    }
+
+<# for (var localIndex = 0; localIndex < i; localIndex++) { #>
+                    var pComp<#= localIndex #> = (T<#= localIndex #>*)(basePtrs[<#= localIndex #>] + (sizeof(T<#= localIndex #>) * entityIndex));
+<# } #>
+
+<# if (isForEachWithEntity) { #>
+                    var pEntity = (Entity*)(pChunkData + archetype.EntityIDsOffset + (sizeof(Entity) * entityIndex));
+                    action(*pEntity, <#= AppendParameters(i, "ref *pComp{0}") #>);
+<# } else { #>
+                    action(<#= AppendParameters(i, "ref *pComp{0}") #>);
+<# } #>
+                }
+            }
+        }
+    }
+
+<# } #>
+<# } #>
+}

Ghost.Entities/Templates/EntityQuery.JobEntity.tt

@@ -0,0 +1,234 @@
+<#@ template language="C#" #>
+<#@ output extension="gen.cs" #>
+<#@ assembly name="System.Core" #>
+<#@ import namespace="System.Linq" #>
+<#@ import namespace="System.Text" #>
+<#@ include file="Helpers.ttinclude" #>
+using Ghost.Core;
+using Misaki.HighPerformance.Jobs;
+using Misaki.HighPerformance.LowLevel.Collections;
+
+namespace Ghost.Entities;
+
+<# for (var i = 1; i <= Amount; i++)
+{
+    var generics = AppendGenerics(i);
+    var restrictions = AppendGenericRestrictionsMultiline(i, "unmanaged, IComponent", 1);
+#>
+public interface IJobEntity<<#= generics #>>
+<#= restrictions #>
+{
+    void Execute(Entity entity, <#= AppendParameters(i, "ref T{0} component{0}") #>, int threadIndex);
+}
+
+internal unsafe struct JobEntityBatch<TJob, <#= generics #>> : IJobParallelFor
+    where TJob : unmanaged, IJobEntity<<#= generics #>>
+<#= restrictions #>
+{
+    public fixed int componentIDs[<#= i #>];
+    public fixed bool componentRW[<#= i #>];
+
+    public TJob userJob;
+
+    public UnsafeList<IntPtr> chunks;
+    public UnsafeList<IntPtr> chunkVersions;
+    public UnsafeList<int> chunkCount;
+    public UnsafeList<int> entityOffset;
+
+<# for (var j = 0; j < i; j++){ #>
+    public UnsafeList<int> offsets<#= j #>;
+    public UnsafeList<int> bitsOffsets<#= j #>;
+    public UnsafeList<int> versionindices<#= j #>;
+
+<# } #>
+    public int version;
+
+    public void Execute(int loopIndex, int threadIndex)
+    {
+        // 1. Get the specific pChunk for this thread
+        var pChunk = (byte*)chunks[loopIndex];
+        var pVersions = (int*)chunkVersions[loopIndex];
+        var count = chunkCount[loopIndex];
+
+<# for (var j = 0; j < i; j++){ #>
+        var off<#= j #> = offsets<#= j #>[loopIndex];
+        var enableOff<#= j #> = bitsOffsets<#= j #>[loopIndex];
+        var versionIndex<#= j #> = versionindices<#= j #>[loopIndex];
+
+<# } #>
+        var pEntity = (Entity*)(pChunk + entityOffset[loopIndex]);
+<# for (var j = 0; j < i; j++){ #>
+        var ptr<#= j #> = (<#= "T" + j #>*)(pChunk + off<#= j #>);
+<# } #>
+
+        // 2. Update versions for RW components
+<# for (var j = 0; j < i; j++){ #>
+        if (componentRW[<#= j #>])
+        {
+            pVersions[versionIndex<#= j #>] = version;
+        }
+
+<# } #>
+        // 3. Iterate all entities in this chunk
+        for (var i = 0; i < count; i++)
+        {
+<# for (var j = 0; j < i; j++){ #>
+            if (enableOff<#= j #> != -1 && !EntityQuery.CheckBit(pChunk + enableOff<#= j #>, i))
+            {
+                continue;
+            }
+
+<# } #>
+            userJob.Execute(pEntity[i], <#= AppendParameters(i, "ref ptr{0}[i]") #>, threadIndex);
+        }
+    }
+}
+
+<# } #>
+public unsafe partial struct EntityQuery
+{
+<# for (var i = 1; i <= Amount; i++)
+{
+    var generics = AppendGenerics(i);
+    var restrictions = AppendGenericRestrictionsMultiline(i, "unmanaged, IComponent", 2);
+#>
+    private struct DisposeJobEntity<#= i #> : IJob
+    {
+        public UnsafeList<IntPtr> chunks;
+        public UnsafeList<IntPtr> chunkVersions;
+        public UnsafeList<int> chunkEntityCounts;
+        public UnsafeList<int> entityOffsets;
+
+<# for (var j = 0; j < i; j++){ #>
+        public UnsafeList<int> offsets<#= j #>;
+        public UnsafeList<int> bitsOffsets<#= j #>;
+        public UnsafeList<int> versionindices<#= j #>;
+
+<# } #>
+        public void Execute(int threadIndex)
+        {
+            chunks.Dispose();
+            chunkVersions.Dispose();
+            chunkEntityCounts.Dispose();
+            entityOffsets.Dispose();
+
+<# for (var j = 0; j < i; j++){ #>
+            offsets<#= j #>.Dispose();
+            bitsOffsets<#= j #>.Dispose();
+            versionindices<#= j #>.Dispose();
+
+<# } #>
+        }
+    }
+
+    public JobHandle ScheduleEntityParallel<TJob, <#= generics #>>(TJob jobData, int batchSize, JobHandle dependency)
+        where TJob : unmanaged, IJobEntity<<#= generics #>>
+<#= restrictions #>
+    {
+        var world = World.GetWorld(_worldID).GetValueOrThrow();
+
+        // 1. Flatten the World
+        var chunks = new UnsafeList<IntPtr>(128, JobScheduler.TempAllocatorHandle);
+        var chunkVersions = new UnsafeList<IntPtr>(128, JobScheduler.TempAllocatorHandle);
+        var chunkEntityCounts = new UnsafeList<int>(128, JobScheduler.TempAllocatorHandle);
+        var entityOffsets = new UnsafeList<int>(128, JobScheduler.TempAllocatorHandle);
+
+<# for (var j = 0; j < i; j++){ #>
+        var offsets<#= j #> = new UnsafeList<int>(128, JobScheduler.TempAllocatorHandle);
+        var bitsOffsets<#= j #> = new UnsafeList<int>(128, JobScheduler.TempAllocatorHandle);
+        var versionIndices<#= j #> = new UnsafeList<int>(128, JobScheduler.TempAllocatorHandle);
+
+<# } #>
+        // Iterate the Query's matching archetypes
+        foreach (var archID in _matchingArchetypes)
+        {
+            ref var arch = ref world.GetArchetypeReference(archID);
+
+            if (arch.ChunkCount == 0)
+            {
+                continue;
+            }
+
+            // Get offsets ONCE per archetype
+<# for (var j = 0; j < i; j++){ #>
+            var layout<#= j #> = arch.GetLayout(ComponentTypeID<T<#= j #>>.value)
+                .GetValueOrThrow();
+<# } #>
+
+            // Add all chunks from this archetype
+            for (var i = 0; i < arch.ChunkCount; i++)
+            {
+                ref var chunkRef = ref arch.GetChunkReference(i);
+
+                chunks.Add((IntPtr)chunkRef.GetUnsafePtr());
+                chunkVersions.Add((IntPtr)chunkRef.GetVersionUnsafePtr());
+                chunkEntityCounts.Add(chunkRef._count);
+                entityOffsets.Add(arch.EntityIDsOffset);
+
+<# for (var j = 0; j < i; j++){ #>
+                offsets<#= j #>.Add(layout<#= j #>.offset);
+                bitsOffsets<#= j #>.Add(layout<#= j #>.enableBitsOffset);
+                versionIndices<#= j #>.Add(layout<#= j #>.versionIndex);
+
+<# } #>
+            }
+        }
+
+        // 2. Create the Runner
+        var runner = new JobEntityBatch<TJob, <#= generics #>>
+        {
+            userJob = jobData,
+            chunks = chunks,
+            chunkVersions = chunkVersions,
+            chunkCount = chunkEntityCounts,
+            entityOffset = entityOffsets,
+
+<# for (var j = 0; j < i; j++){ #>
+            offsets<#= j #> = offsets<#= j #>,
+            bitsOffsets<#= j #> = bitsOffsets<#= j #>,
+            versionindices<#= j #> = versionIndices<#= j #>,
+
+<# } #>
+            version = world.Version,
+        };
+
+        runner.componentIDs[0] = ComponentTypeID<T0>.value;
+
+        var it = _mask.writeAccess.GetIterator();
+        while (it.Next(out var id))
+        {
+            for (var i =0; i < 1; i++)
+            {
+                if (id == runner.componentIDs[i])
+                {
+                    runner.componentRW[i] = true;
+                    break;
+                }
+            }
+        }
+
+        var jobHandle = world.JobScheduler.ScheduleParallel(ref runner, chunks.Count, batchSize, dependency);
+
+        // 3. Dispose the temp lists
+        var disposeJob = new DisposeJobEntity<#= i #>
+        {
+            chunks = chunks,
+            chunkVersions = chunkVersions,
+            chunkEntityCounts = chunkEntityCounts,
+            entityOffsets = entityOffsets,
+
+<# for (var j = 0; j < i; j++){ #>
+            offsets<#= j #> = offsets<#= j #>,
+            bitsOffsets<#= j #> = bitsOffsets<#= j #>,
+            versionindices<#= j #> = versionIndices<#= j #>,
+
+<# } #>
+        };
+
+        world.JobScheduler.Schedule(ref disposeJob, jobHandle);
+
+        return jobHandle;
+    }
+
+<# } #>
+}

Ghost.Entities/Templates/ForEach.gen.cs

@@ -0,0 +1,35 @@
+namespace Ghost.Entities;
+
+public delegate void ForEach<T0>(ref T0 component0)
+    where T0 : unmanaged, IComponent;
+public delegate void ForEach<T0, T1>(ref T0 component0, ref T1 component1)
+    where T0 : unmanaged, IComponent where T1 : unmanaged, IComponent;
+public delegate void ForEach<T0, T1, T2>(ref T0 component0, ref T1 component1, ref T2 component2)
+    where T0 : unmanaged, IComponent where T1 : unmanaged, IComponent where T2 : unmanaged, IComponent;
+public delegate void ForEach<T0, T1, T2, T3>(ref T0 component0, ref T1 component1, ref T2 component2, ref T3 component3)
+    where T0 : unmanaged, IComponent where T1 : unmanaged, IComponent where T2 : unmanaged, IComponent where T3 : unmanaged, IComponent;
+public delegate void ForEach<T0, T1, T2, T3, T4>(ref T0 component0, ref T1 component1, ref T2 component2, ref T3 component3, ref T4 component4)
+    where T0 : unmanaged, IComponent where T1 : unmanaged, IComponent where T2 : unmanaged, IComponent where T3 : unmanaged, IComponent where T4 : unmanaged, IComponent;
+public delegate void ForEach<T0, T1, T2, T3, T4, T5>(ref T0 component0, ref T1 component1, ref T2 component2, ref T3 component3, ref T4 component4, ref T5 component5)
+    where T0 : unmanaged, IComponent where T1 : unmanaged, IComponent where T2 : unmanaged, IComponent where T3 : unmanaged, IComponent where T4 : unmanaged, IComponent where T5 : unmanaged, IComponent;
+public delegate void ForEach<T0, T1, T2, T3, T4, T5, T6>(ref T0 component0, ref T1 component1, ref T2 component2, ref T3 component3, ref T4 component4, ref T5 component5, ref T6 component6)
+    where T0 : unmanaged, IComponent where T1 : unmanaged, IComponent where T2 : unmanaged, IComponent where T3 : unmanaged, IComponent where T4 : unmanaged, IComponent where T5 : unmanaged, IComponent where T6 : unmanaged, IComponent;
+public delegate void ForEach<T0, T1, T2, T3, T4, T5, T6, T7>(ref T0 component0, ref T1 component1, ref T2 component2, ref T3 component3, ref T4 component4, ref T5 component5, ref T6 component6, ref T7 component7)
+    where T0 : unmanaged, IComponent where T1 : unmanaged, IComponent where T2 : unmanaged, IComponent where T3 : unmanaged, IComponent where T4 : unmanaged, IComponent where T5 : unmanaged, IComponent where T6 : unmanaged, IComponent where T7 : unmanaged, IComponent;
+
+public delegate void ForEachWithEntity<T0>(Entity entity, ref T0 component0)
+    where T0 : unmanaged, IComponent;
+public delegate void ForEachWithEntity<T0, T1>(Entity entity, ref T0 component0, ref T1 component1)
+    where T0 : unmanaged, IComponent where T1 : unmanaged, IComponent;
+public delegate void ForEachWithEntity<T0, T1, T2>(Entity entity, ref T0 component0, ref T1 component1, ref T2 component2)
+    where T0 : unmanaged, IComponent where T1 : unmanaged, IComponent where T2 : unmanaged, IComponent;
+public delegate void ForEachWithEntity<T0, T1, T2, T3>(Entity entity, ref T0 component0, ref T1 component1, ref T2 component2, ref T3 component3)
+    where T0 : unmanaged, IComponent where T1 : unmanaged, IComponent where T2 : unmanaged, IComponent where T3 : unmanaged, IComponent;
+public delegate void ForEachWithEntity<T0, T1, T2, T3, T4>(Entity entity, ref T0 component0, ref T1 component1, ref T2 component2, ref T3 component3, ref T4 component4)
+    where T0 : unmanaged, IComponent where T1 : unmanaged, IComponent where T2 : unmanaged, IComponent where T3 : unmanaged, IComponent where T4 : unmanaged, IComponent;
+public delegate void ForEachWithEntity<T0, T1, T2, T3, T4, T5>(Entity entity, ref T0 component0, ref T1 component1, ref T2 component2, ref T3 component3, ref T4 component4, ref T5 component5)
+    where T0 : unmanaged, IComponent where T1 : unmanaged, IComponent where T2 : unmanaged, IComponent where T3 : unmanaged, IComponent where T4 : unmanaged, IComponent where T5 : unmanaged, IComponent;
+public delegate void ForEachWithEntity<T0, T1, T2, T3, T4, T5, T6>(Entity entity, ref T0 component0, ref T1 component1, ref T2 component2, ref T3 component3, ref T4 component4, ref T5 component5, ref T6 component6)
+    where T0 : unmanaged, IComponent where T1 : unmanaged, IComponent where T2 : unmanaged, IComponent where T3 : unmanaged, IComponent where T4 : unmanaged, IComponent where T5 : unmanaged, IComponent where T6 : unmanaged, IComponent;
+public delegate void ForEachWithEntity<T0, T1, T2, T3, T4, T5, T6, T7>(Entity entity, ref T0 component0, ref T1 component1, ref T2 component2, ref T3 component3, ref T4 component4, ref T5 component5, ref T6 component6, ref T7 component7)
+    where T0 : unmanaged, IComponent where T1 : unmanaged, IComponent where T2 : unmanaged, IComponent where T3 : unmanaged, IComponent where T4 : unmanaged, IComponent where T5 : unmanaged, IComponent where T6 : unmanaged, IComponent where T7 : unmanaged, IComponent;

Ghost.Entities/Templates/ForEach.tt

@@ -0,0 +1,27 @@
+<#@ template language="C#" #>
+<#@ output extension="gen.cs" #>
+<#@ assembly name="System.Core" #>
+<#@ import namespace="System.Linq" #>
+<#@ import namespace="System.Text" #>
+<#@ include file="Helpers.ttinclude" #>
+namespace Ghost.Entities;
+
+<# for (var i = 1; i <= Amount; i++)
+{
+    var generics = AppendParameters(i, "T{0}");
+    var compGenerics = AppendParameters(i, "ref T{0} component{0}");
+    var restrictions = AppendGenericRestrictions(i, "unmanaged, IComponent");
+#>
+public delegate void ForEach<<#= generics #>>(<#= compGenerics #>)
+    <#= restrictions #>;
+<# } #>
+
+<# for (var i = 1; i <= Amount; i++)
+{
+    var generics = AppendParameters(i, "T{0}");
+    var compGenerics = AppendParameters(i, "ref T{0} component{0}");
+    var restrictions = AppendGenericRestrictions(i, "unmanaged, IComponent");
+#>
+public delegate void ForEachWithEntity<<#= generics #>>(Entity entity, <#= compGenerics #>)
+    <#= restrictions #>;
+<# } #>

Ghost.Entities/Templates/Helpers.ttinclude

@@ -1,4 +1,4 @@
-<#@ import namespace="System.Text" #>
+<#@ import namespace="System.Text" #>
 <#@ import namespace="System.Collections.Generic" #>
 <#+
 
@@ -17,37 +17,29 @@
         for (var i = 0; i < amount; i++)
         {
             if (i > 0) sb.Append(", ");
-            sb.Append($"{template}{i}");
+            sb.Append(string.Format(template, i));
         }
+
         return sb.ToString();
     }
 
     string AppendGenerics(int amount)
     {
-        return AppendGenerics(amount, "T");
+        return AppendGenerics(amount, "T{0}");
     }
 
-    public StringBuilder AppendGenericRefParameters(int amount)
+    public StringBuilder AppendParameters(int amount, string template)
     {
         var sb = new StringBuilder();
         for (var localIndex = 0; localIndex < amount; localIndex++)
         {
-            sb.Append($"ref T{localIndex} t{localIndex}Component,");
+            sb.Append(string.Format(template, localIndex));
+            if (localIndex < amount - 1)
+            {
+                sb.Append(", ");
+            }
         }
 
-        sb.Length--;
-        return sb;
-    }
-
-    public StringBuilder AppendRefParameters(int amount)
-    {
-        var sb = new StringBuilder();
-        for (var localIndex = 0; localIndex < amount; localIndex++)
-        {
-            sb.Append($"ref component{localIndex},");
-        }
-
-        sb.Length--;
         return sb;
     }
 
@@ -62,6 +54,7 @@
                 sb.Append(' ');
             }
         }
+
         return sb;
     }
 
@@ -70,6 +63,28 @@
         return AppendGenericRestrictions(amount, "T", template);
     }
 
+    public StringBuilder AppendGenericRestrictionsMultiline(int amount, string Ttemplate, string template, int indentation)
+    {
+        var sb = new StringBuilder();
+        var spaces = new string(' ', indentation * 4);
+
+        for (var localIndex = 0; localIndex < amount; localIndex++)
+        {
+            sb.Append($"{spaces}where {Ttemplate}{localIndex} : {template}");
+            if (localIndex < amount - 1)
+            {
+                sb.AppendLine();
+            }
+        }
+
+        return sb;
+    }
+
+    public StringBuilder AppendGenericRestrictionsMultiline(int amount, string template, int indentation)
+    {
+        return AppendGenericRestrictionsMultiline(amount, "T", template, indentation);
+    }
+
     public StringBuilder TryGetComponentPools(int amount)
     {
         var sb = new StringBuilder();
@@ -81,6 +96,7 @@
                 sb.Append(" && ");
             }
         }
+
         return sb;
     }
 
@@ -95,6 +111,7 @@
                 sb.Append(" && ");
             }
         }
+
         return sb;
     }
 
@@ -109,10 +126,11 @@
                 sb.Append(", ");
             }
         }
+
         return sb;
     }
 
-        public StringBuilder GetComponentRef(int amount)
+    public StringBuilder GetComponentRef(int amount)
     {
         var sb = new StringBuilder();
         for (var localIndex = 0; localIndex < amount; localIndex++)
@@ -123,6 +141,7 @@
                 sb.Append(", ");
             }
         }
+
         return sb;
     }
 #>

Ghost.Entities/Templates/QueryBuilder.With.gen.cs

@@ -0,0 +1,380 @@
+
+using System.Runtime.CompilerServices;
+
+namespace Ghost.Entities;
+
+public ref partial struct QueryBuilder
+{
+    /// <summary>
+    /// Adds the specified component type(s) to the 'All' filter of the query.
+    /// Targets entities that have all of the specified component types and those component(s) must be enabled.
+    /// </summary>
+    [MethodImpl(MethodImplOptions.AggressiveInlining)]
+    public QueryBuilder WithAll<T0>()
+        where T0 : unmanaged, IComponent
+    {
+        _all.Add(ComponentTypeID<T0>.value);
+
+        return this;
+    }
+
+    /// <summary>
+    /// Adds the specified component type(s) to the 'All' filter of the query and requires read-write access.
+    /// Targets entities that have all of the specified component types and those component(s) must be enabled.
+    /// </summary>
+    [MethodImpl(MethodImplOptions.AggressiveInlining)]
+    public QueryBuilder WithAllRW<T0>()
+        where T0 : unmanaged, IComponent
+    {
+        _all.Add(ComponentTypeID<T0>.value);
+        _rw.Add(ComponentTypeID<T0>.value);
+
+        return this;
+    }
+
+    /// <summary>
+    /// Adds the specified component type(s) to the 'Any' filter of the query.
+    /// Targets entities that have at least one of the specified component types and those component(s) must be enabled.
+    /// </summary>
+    [MethodImpl(MethodImplOptions.AggressiveInlining)]
+    public QueryBuilder WithAny<T0>()
+        where T0 : unmanaged, IComponent
+    {
+        _any.Add(ComponentTypeID<T0>.value);
+
+        return this;
+    }
+
+    /// <summary>
+    /// Adds the specified component type(s) to the 'Absent' filter of the query.
+    /// Targets entities that do not have any of the specified component types.
+    /// </summary>
+    [MethodImpl(MethodImplOptions.AggressiveInlining)]
+    public QueryBuilder WithAbsent<T0>()
+        where T0 : unmanaged, IComponent
+    {
+        _absent.Add(ComponentTypeID<T0>.value);
+
+        return this;
+    }
+
+    /// <summary>
+    /// Adds the specified component type(s) to the 'None' filter of the query.
+    /// Targets entities that do not have any of the specified component types, or those component(s) are disabled.
+    /// </summary>
+    [MethodImpl(MethodImplOptions.AggressiveInlining)]
+    public QueryBuilder WithNone<T0>()
+        where T0 : unmanaged, IComponent
+    {
+        _none.Add(ComponentTypeID<T0>.value);
+
+        return this;
+    }
+
+    /// <summary>
+    /// Adds the specified component type(s) to the 'Disabled' filter of the query.
+    /// Targets entities that have all of the specified component types and those component(s) are disabled.
+    /// </summary>
+    [MethodImpl(MethodImplOptions.AggressiveInlining)]
+    public QueryBuilder WithDisabled<T0>()
+        where T0 : unmanaged, IEnableableComponent
+    {
+        _disabled.Add(ComponentTypeID<T0>.value);
+
+        return this;
+    }
+
+    /// <summary>
+    /// Adds the specified component type(s) to the 'Present' filter of the query.
+    /// Targets entities that have all of the specified component types, regardless of whether those component(s) are enabled or disabled.
+    /// </summary>
+    [MethodImpl(MethodImplOptions.AggressiveInlining)]
+    public QueryBuilder WithPresent<T0>()
+        where T0 : unmanaged, IComponent
+    {
+        _present.Add(ComponentTypeID<T0>.value);
+
+        return this;
+    }
+
+    /// <summary>
+    /// Adds the specified component type(s) to the 'Present' filter of the query and requires read-write access.
+    /// Targets entities that have all of the specified component types, regardless of whether those component(s) are enabled or disabled.
+    /// </summary>
+    [MethodImpl(MethodImplOptions.AggressiveInlining)]
+    public QueryBuilder WithPresentRW<T0>()
+        where T0 : unmanaged, IComponent
+    {
+        _present.Add(ComponentTypeID<T0>.value);
+        _rw.Add(ComponentTypeID<T0>.value);
+
+        return this;
+    }
+
+    /// <summary>
+    /// Adds the specified component type(s) to the 'All' filter of the query.
+    /// Targets entities that have all of the specified component types and those component(s) must be enabled.
+    /// </summary>
+    [MethodImpl(MethodImplOptions.AggressiveInlining)]
+    public QueryBuilder WithAll<T0, T1>()
+        where T0 : unmanaged, IComponent
+        where T1 : unmanaged, IComponent
+    {
+        _all.Add(ComponentTypeID<T0>.value);
+        _all.Add(ComponentTypeID<T1>.value);
+
+        return this;
+    }
+
+    /// <summary>
+    /// Adds the specified component type(s) to the 'All' filter of the query and requires read-write access.
+    /// Targets entities that have all of the specified component types and those component(s) must be enabled.
+    /// </summary>
+    [MethodImpl(MethodImplOptions.AggressiveInlining)]
+    public QueryBuilder WithAllRW<T0, T1>()
+        where T0 : unmanaged, IComponent
+        where T1 : unmanaged, IComponent
+    {
+        _all.Add(ComponentTypeID<T0>.value);
+        _rw.Add(ComponentTypeID<T0>.value);
+        _all.Add(ComponentTypeID<T1>.value);
+        _rw.Add(ComponentTypeID<T1>.value);
+
+        return this;
+    }
+
+    /// <summary>
+    /// Adds the specified component type(s) to the 'Any' filter of the query.
+    /// Targets entities that have at least one of the specified component types and those component(s) must be enabled.
+    /// </summary>
+    [MethodImpl(MethodImplOptions.AggressiveInlining)]
+    public QueryBuilder WithAny<T0, T1>()
+        where T0 : unmanaged, IComponent
+        where T1 : unmanaged, IComponent
+    {
+        _any.Add(ComponentTypeID<T0>.value);
+        _any.Add(ComponentTypeID<T1>.value);
+
+        return this;
+    }
+
+    /// <summary>
+    /// Adds the specified component type(s) to the 'Absent' filter of the query.
+    /// Targets entities that do not have any of the specified component types.
+    /// </summary>
+    [MethodImpl(MethodImplOptions.AggressiveInlining)]
+    public QueryBuilder WithAbsent<T0, T1>()
+        where T0 : unmanaged, IComponent
+        where T1 : unmanaged, IComponent
+    {
+        _absent.Add(ComponentTypeID<T0>.value);
+        _absent.Add(ComponentTypeID<T1>.value);
+
+        return this;
+    }
+
+    /// <summary>
+    /// Adds the specified component type(s) to the 'None' filter of the query.
+    /// Targets entities that do not have any of the specified component types, or those component(s) are disabled.
+    /// </summary>
+    [MethodImpl(MethodImplOptions.AggressiveInlining)]
+    public QueryBuilder WithNone<T0, T1>()
+        where T0 : unmanaged, IComponent
+        where T1 : unmanaged, IComponent
+    {
+        _none.Add(ComponentTypeID<T0>.value);
+        _none.Add(ComponentTypeID<T1>.value);
+
+        return this;
+    }
+
+    /// <summary>
+    /// Adds the specified component type(s) to the 'Disabled' filter of the query.
+    /// Targets entities that have all of the specified component types and those component(s) are disabled.
+    /// </summary>
+    [MethodImpl(MethodImplOptions.AggressiveInlining)]
+    public QueryBuilder WithDisabled<T0, T1>()
+        where T0 : unmanaged, IEnableableComponent
+        where T1 : unmanaged, IEnableableComponent
+    {
+        _disabled.Add(ComponentTypeID<T0>.value);
+        _disabled.Add(ComponentTypeID<T1>.value);
+
+        return this;
+    }
+
+    /// <summary>
+    /// Adds the specified component type(s) to the 'Present' filter of the query.
+    /// Targets entities that have all of the specified component types, regardless of whether those component(s) are enabled or disabled.
+    /// </summary>
+    [MethodImpl(MethodImplOptions.AggressiveInlining)]
+    public QueryBuilder WithPresent<T0, T1>()
+        where T0 : unmanaged, IComponent
+        where T1 : unmanaged, IComponent
+    {
+        _present.Add(ComponentTypeID<T0>.value);
+        _present.Add(ComponentTypeID<T1>.value);
+
+        return this;
+    }
+
+    /// <summary>
+    /// Adds the specified component type(s) to the 'Present' filter of the query and requires read-write access.
+    /// Targets entities that have all of the specified component types, regardless of whether those component(s) are enabled or disabled.
+    /// </summary>
+    [MethodImpl(MethodImplOptions.AggressiveInlining)]
+    public QueryBuilder WithPresentRW<T0, T1>()
+        where T0 : unmanaged, IComponent
+        where T1 : unmanaged, IComponent
+    {
+        _present.Add(ComponentTypeID<T0>.value);
+        _rw.Add(ComponentTypeID<T0>.value);
+        _present.Add(ComponentTypeID<T1>.value);
+        _rw.Add(ComponentTypeID<T1>.value);
+
+        return this;
+    }
+
+    /// <summary>
+    /// Adds the specified component type(s) to the 'All' filter of the query.
+    /// Targets entities that have all of the specified component types and those component(s) must be enabled.
+    /// </summary>
+    [MethodImpl(MethodImplOptions.AggressiveInlining)]
+    public QueryBuilder WithAll<T0, T1, T2>()
+        where T0 : unmanaged, IComponent
+        where T1 : unmanaged, IComponent
+        where T2 : unmanaged, IComponent
+    {
+        _all.Add(ComponentTypeID<T0>.value);
+        _all.Add(ComponentTypeID<T1>.value);
+        _all.Add(ComponentTypeID<T2>.value);
+
+        return this;
+    }
+
+    /// <summary>
+    /// Adds the specified component type(s) to the 'All' filter of the query and requires read-write access.
+    /// Targets entities that have all of the specified component types and those component(s) must be enabled.
+    /// </summary>
+    [MethodImpl(MethodImplOptions.AggressiveInlining)]
+    public QueryBuilder WithAllRW<T0, T1, T2>()
+        where T0 : unmanaged, IComponent
+        where T1 : unmanaged, IComponent
+        where T2 : unmanaged, IComponent
+    {
+        _all.Add(ComponentTypeID<T0>.value);
+        _rw.Add(ComponentTypeID<T0>.value);
+        _all.Add(ComponentTypeID<T1>.value);
+        _rw.Add(ComponentTypeID<T1>.value);
+        _all.Add(ComponentTypeID<T2>.value);
+        _rw.Add(ComponentTypeID<T2>.value);
+
+        return this;
+    }
+
+    /// <summary>
+    /// Adds the specified component type(s) to the 'Any' filter of the query.
+    /// Targets entities that have at least one of the specified component types and those component(s) must be enabled.
+    /// </summary>
+    [MethodImpl(MethodImplOptions.AggressiveInlining)]
+    public QueryBuilder WithAny<T0, T1, T2>()
+        where T0 : unmanaged, IComponent
+        where T1 : unmanaged, IComponent
+        where T2 : unmanaged, IComponent
+    {
+        _any.Add(ComponentTypeID<T0>.value);
+        _any.Add(ComponentTypeID<T1>.value);
+        _any.Add(ComponentTypeID<T2>.value);
+
+        return this;
+    }
+
+    /// <summary>
+    /// Adds the specified component type(s) to the 'Absent' filter of the query.
+    /// Targets entities that do not have any of the specified component types.
+    /// </summary>
+    [MethodImpl(MethodImplOptions.AggressiveInlining)]
+    public QueryBuilder WithAbsent<T0, T1, T2>()
+        where T0 : unmanaged, IComponent
+        where T1 : unmanaged, IComponent
+        where T2 : unmanaged, IComponent
+    {
+        _absent.Add(ComponentTypeID<T0>.value);
+        _absent.Add(ComponentTypeID<T1>.value);
+        _absent.Add(ComponentTypeID<T2>.value);
+
+        return this;
+    }
+
+    /// <summary>
+    /// Adds the specified component type(s) to the 'None' filter of the query.
+    /// Targets entities that do not have any of the specified component types, or those component(s) are disabled.
+    /// </summary>
+    [MethodImpl(MethodImplOptions.AggressiveInlining)]
+    public QueryBuilder WithNone<T0, T1, T2>()
+        where T0 : unmanaged, IComponent
+        where T1 : unmanaged, IComponent
+        where T2 : unmanaged, IComponent
+    {
+        _none.Add(ComponentTypeID<T0>.value);
+        _none.Add(ComponentTypeID<T1>.value);
+        _none.Add(ComponentTypeID<T2>.value);
+
+        return this;
+    }
+
+    /// <summary>
+    /// Adds the specified component type(s) to the 'Disabled' filter of the query.
+    /// Targets entities that have all of the specified component types and those component(s) are disabled.
+    /// </summary>
+    [MethodImpl(MethodImplOptions.AggressiveInlining)]
+    public QueryBuilder WithDisabled<T0, T1, T2>()
+        where T0 : unmanaged, IEnableableComponent
+        where T1 : unmanaged, IEnableableComponent
+        where T2 : unmanaged, IEnableableComponent
+    {
+        _disabled.Add(ComponentTypeID<T0>.value);
+        _disabled.Add(ComponentTypeID<T1>.value);
+        _disabled.Add(ComponentTypeID<T2>.value);
+
+        return this;
+    }
+
+    /// <summary>
+    /// Adds the specified component type(s) to the 'Present' filter of the query.
+    /// Targets entities that have all of the specified component types, regardless of whether those component(s) are enabled or disabled.
+    /// </summary>
+    [MethodImpl(MethodImplOptions.AggressiveInlining)]
+    public QueryBuilder WithPresent<T0, T1, T2>()
+        where T0 : unmanaged, IComponent
+        where T1 : unmanaged, IComponent
+        where T2 : unmanaged, IComponent
+    {
+        _present.Add(ComponentTypeID<T0>.value);
+        _present.Add(ComponentTypeID<T1>.value);
+        _present.Add(ComponentTypeID<T2>.value);
+
+        return this;
+    }
+
+    /// <summary>
+    /// Adds the specified component type(s) to the 'Present' filter of the query and requires read-write access.
+    /// Targets entities that have all of the specified component types, regardless of whether those component(s) are enabled or disabled.
+    /// </summary>
+    [MethodImpl(MethodImplOptions.AggressiveInlining)]
+    public QueryBuilder WithPresentRW<T0, T1, T2>()
+        where T0 : unmanaged, IComponent
+        where T1 : unmanaged, IComponent
+        where T2 : unmanaged, IComponent
+    {
+        _present.Add(ComponentTypeID<T0>.value);
+        _rw.Add(ComponentTypeID<T0>.value);
+        _present.Add(ComponentTypeID<T1>.value);
+        _rw.Add(ComponentTypeID<T1>.value);
+        _present.Add(ComponentTypeID<T2>.value);
+        _rw.Add(ComponentTypeID<T2>.value);
+
+        return this;
+    }
+
+}

Ghost.Entities/Templates/QueryBuilder.With.tt

@@ -0,0 +1,142 @@
+<#@ template language="C#" #>
+<#@ output extension="gen.cs" #>
+<#@ assembly name="System.Core" #>
+<#@ import namespace="System.Linq" #>
+<#@ import namespace="System.Text" #>
+<#@ include file="Helpers.ttinclude" #>
+using System.Runtime.CompilerServices;
+
+namespace Ghost.Entities;
+
+public ref partial struct QueryBuilder
+{
+<# for (var i = 1; i <= 3; i++)
+{
+    var generics = AppendGenerics(i);
+    var restrictions = AppendGenericRestrictionsMultiline(i, "unmanaged, IComponent", 2);
+    var enableRestrictions = AppendGenericRestrictionsMultiline(i, "unmanaged, IEnableableComponent", 2);
+#>
+    /// <summary>
+    /// Adds the specified component type(s) to the 'All' filter of the query.
+    /// Targets entities that have all of the specified component types and those component(s) must be enabled.
+    /// </summary>
+    [MethodImpl(MethodImplOptions.AggressiveInlining)]
+    public QueryBuilder WithAll<<#= generics #>>()
+<#= restrictions #>
+    {
+<# for (var j = 0; j < i; j++) { #>
+        _all.Add(ComponentTypeID<T<#= j #>>.value);
+<# } #>
+
+        return this;
+    }
+
+    /// <summary>
+    /// Adds the specified component type(s) to the 'All' filter of the query and requires read-write access.
+    /// Targets entities that have all of the specified component types and those component(s) must be enabled.
+    /// </summary>
+    [MethodImpl(MethodImplOptions.AggressiveInlining)]
+    public QueryBuilder WithAllRW<<#= generics #>>()
+<#= restrictions #>
+    {
+<# for (var j = 0; j < i; j++) { #>
+        _all.Add(ComponentTypeID<T<#= j #>>.value);
+        _rw.Add(ComponentTypeID<T<#= j #>>.value);
+<# } #>
+
+        return this;
+    }
+
+    /// <summary>
+    /// Adds the specified component type(s) to the 'Any' filter of the query.
+    /// Targets entities that have at least one of the specified component types and those component(s) must be enabled.
+    /// </summary>
+    [MethodImpl(MethodImplOptions.AggressiveInlining)]
+    public QueryBuilder WithAny<<#= generics #>>()
+<#= restrictions #>
+    {
+<# for (var j = 0; j < i; j++) { #>
+        _any.Add(ComponentTypeID<T<#= j #>>.value);
+<# } #>
+
+        return this;
+    }
+
+    /// <summary>
+    /// Adds the specified component type(s) to the 'Absent' filter of the query.
+    /// Targets entities that do not have any of the specified component types.
+    /// </summary>
+    [MethodImpl(MethodImplOptions.AggressiveInlining)]
+    public QueryBuilder WithAbsent<<#= generics #>>()
+<#= restrictions #>
+    {
+<# for (var j = 0; j < i; j++) { #>
+        _absent.Add(ComponentTypeID<T<#= j #>>.value);
+<# } #>
+
+        return this;
+    }
+
+    /// <summary>
+    /// Adds the specified component type(s) to the 'None' filter of the query.
+    /// Targets entities that do not have any of the specified component types, or those component(s) are disabled.
+    /// </summary>
+    [MethodImpl(MethodImplOptions.AggressiveInlining)]
+    public QueryBuilder WithNone<<#= generics #>>()
+<#= restrictions #>
+    {
+<# for (var j = 0; j < i; j++) { #>
+        _none.Add(ComponentTypeID<T<#= j #>>.value);
+<# } #>
+
+        return this;
+    }
+
+    /// <summary>
+    /// Adds the specified component type(s) to the 'Disabled' filter of the query.
+    /// Targets entities that have all of the specified component types and those component(s) are disabled.
+    /// </summary>
+    [MethodImpl(MethodImplOptions.AggressiveInlining)]
+    public QueryBuilder WithDisabled<<#= generics #>>()
+<#= enableRestrictions #>
+    {
+<# for (var j = 0; j < i; j++) { #>
+        _disabled.Add(ComponentTypeID<T<#= j #>>.value);
+<# } #>
+
+        return this;
+    }
+
+    /// <summary>
+    /// Adds the specified component type(s) to the 'Present' filter of the query.
+    /// Targets entities that have all of the specified component types, regardless of whether those component(s) are enabled or disabled.
+    /// </summary>
+    [MethodImpl(MethodImplOptions.AggressiveInlining)]
+    public QueryBuilder WithPresent<<#= generics #>>()
+<#= restrictions #>
+    {
+<# for (var j = 0; j < i; j++) { #>
+        _present.Add(ComponentTypeID<T<#= j #>>.value);
+<# } #>
+
+        return this;
+    }
+
+    /// <summary>
+    /// Adds the specified component type(s) to the 'Present' filter of the query and requires read-write access.
+    /// Targets entities that have all of the specified component types, regardless of whether those component(s) are enabled or disabled.
+    /// </summary>
+    [MethodImpl(MethodImplOptions.AggressiveInlining)]
+    public QueryBuilder WithPresentRW<<#= generics #>>()
+<#= restrictions #>
+    {
+<# for (var j = 0; j < i; j++) { #>
+        _present.Add(ComponentTypeID<T<#= j #>>.value);
+        _rw.Add(ComponentTypeID<T<#= j #>>.value);
+<# } #>
+
+        return this;
+    }
+
+<# } #>
+}

Ghost.Entities/World.cs

@@ -1,73 +1,160 @@
-using Ghost.Entities.Components;
-using Ghost.Entities.Query;
-using Ghost.Entities.Systems;
-using System.Diagnostics;
+using Ghost.Core;
+using Misaki.HighPerformance.Jobs;
+using Misaki.HighPerformance.LowLevel.Buffer;
+using Misaki.HighPerformance.LowLevel.Collections;
 using System.Runtime.CompilerServices;
-using System.Runtime.InteropServices;
 
 namespace Ghost.Entities;
 
-// TODO: Archetype system for better performance
 public partial class World
 {
-    private static List<World> s_worlds = new(4);
-    private static Queue<WorldID> s_freeWorldSlots = new();
+    private static readonly List<World?> s_worlds = new(4);
+    private static readonly Queue<Identifier<World>> s_freeWorldSlots = new();
+
+    internal static Identifier<Archetype> EmptyArchetypeID => new (0);
 
     public static int WorldCount => s_worlds.Count - s_freeWorldSlots.Count;
 
-    public static World Create(int entityCapacity = 16)
+    public static World Create(JobScheduler jobScheduler, int entityCapacity = 16)
     {
         lock (s_worlds)
         {
             if (s_freeWorldSlots.TryDequeue(out var index))
             {
-                s_worlds[index] = new World(index, entityCapacity);
+                s_worlds[index.value] = new World(index, entityCapacity, jobScheduler);
             }
             else
             {
-                if (s_worlds.Count >= WorldID.MaxValue)
-                {
-                    throw new InvalidOperationException("Maximum number of worlds reached");
-                }
-
-                index = (WorldID)s_worlds.Count;
-                s_worlds.Add(new World(index, entityCapacity));
+                index = new Identifier<World>(s_worlds.Count);
+                s_worlds.Add(new World(index, entityCapacity, jobScheduler));
             }
 
-            return s_worlds[index];
+            return s_worlds[index.value]!;
+        }
+    }
+
+    public static void Destroy(Identifier<World> id)
+    {
+        lock (s_worlds)
+        {
+            if (id.value < 0 || id.value >= s_worlds.Count)
+            {
+                return;
+            }
+
+            var world = s_worlds[id.value];
+            world?.Dispose();
         }
     }
 
     [MethodImpl(MethodImplOptions.AggressiveInlining)]
-    public static World GetWorld(int index)
+    internal static World GetWorldUncheck(Identifier<World> id)
     {
-        return s_worlds[index];
+#if DEBUG || GHOST_EDITOR
+        if (id.value < 0 || id.value >= s_worlds.Count)
+        {
+            throw new ArgumentOutOfRangeException(nameof(id), "World ID is out of range.");
+        }
+
+        var world = s_worlds[id.value];
+        return world is null ? throw new InvalidOperationException("World not found.") : world;
+#else
+        return s_worlds[id.value]!;
+#endif
+    }
+
+    [MethodImpl(MethodImplOptions.AggressiveInlining)]
+    public static Result<World, ErrorStatus> GetWorld(Identifier<World> id)
+    {
+        if (id.value < 0 || id.value >= s_worlds.Count)
+        {
+            return ErrorStatus.InvalidArgument;
+        }
+
+        var world = s_worlds[id.value];
+        return world is null ? ErrorStatus.NotFound : world;
     }
 }
 
 public partial class World : IDisposable, IEquatable<World>
 {
-    private readonly WorldID _id;
+    private readonly Identifier<World> _id;
+    private readonly JobScheduler _jobScheduler;
+
     private readonly EntityManager _entityManager;
-    private readonly ComponentStorage _componentStorage;
-    private readonly SystemStorage _systemStorage;
+    private readonly EntityCommandBuffer _entityCommandBuffer;
+    private readonly EntityCommandBuffer[] _threadLocalECBs;
 
-    private bool _isDisposed = false;
+    private readonly SystemManager _systemManager;
 
-    internal ComponentStorage ComponentStorage => _componentStorage;
+    private UnsafeList<Archetype> _archetypes;
+    private UnsafeList<EntityQuery> _entityQueries;
 
-    public WorldID ID => _id;
+    private UnsafeHashMap<int, Identifier<Archetype>> _archetypeLookup; // Signature Hash to Archetype ID
+    private UnsafeHashMap<int, Identifier<EntityQuery>> _querieLookup; // Query Mask Hash to Query ID
+
+    private int _version;
+    private bool _disposed = false;
+
+    internal int ArchetypeCount => _archetypes.Count;
+
+    /// <summary>
+    /// Gets the unique identifier of this world.
+    /// </summary>
+    public Identifier<World> ID => _id;
+
+    /// <summary>
+    /// Gets the job scheduler associated with this world.
+    /// </summary>
+    public JobScheduler JobScheduler => _jobScheduler;
+
+    /// <summary>
+    /// Gets the publicntity manager for this world.
+    /// </summary>
     public EntityManager EntityManager => _entityManager;
-    public SystemStorage SystemStorage => _systemStorage;
 
-    public event Action<World, Entity, Type>? ComponentChanged;
+    /// <summary>
+    /// Gets the system manager for this world.
+    /// </summary>
+    public SystemManager SystemManager => _systemManager;
 
-    private World(WorldID id, int entityCapacity)
+    /// <summary>
+    /// Gets the current version number of the world.
+    /// </summary>
+    public int Version => Interlocked.CompareExchange(ref _version, 0, 0);
+
+    /// <summary>
+    /// Gets the main entity command buffer for this world.
+    /// </summary>
+    /// <remarks>
+    /// Use <see cref="GetThreadLocalEntityCommandBuffer(int)"/> to get thread-local command buffers for multi-threaded jobs.
+    /// </remarks>
+    public EntityCommandBuffer EntityCommandBuffer => _entityCommandBuffer;
+
+    private World(Identifier<World> id, int entityCapacity, JobScheduler jobScheduler)
     {
         _id = id;
+        _jobScheduler = jobScheduler;
+
         _entityManager = new EntityManager(this, entityCapacity);
-        _componentStorage = new ComponentStorage(this);
-        _systemStorage = new SystemStorage(this);
+        _entityCommandBuffer = new EntityCommandBuffer(_entityManager);
+        _threadLocalECBs = new EntityCommandBuffer[jobScheduler.WorkerCount];
+
+        _systemManager = new SystemManager(this);
+
+        _archetypes = new UnsafeList<Archetype>(16, Allocator.Persistent);
+        _entityQueries = new UnsafeList<EntityQuery>(16, Allocator.Persistent);
+
+        _archetypeLookup = new UnsafeHashMap<int, Identifier<Archetype>>(16, Allocator.Persistent);
+        _querieLookup = new UnsafeHashMap<int, Identifier<EntityQuery>>(16, Allocator.Persistent);
+
+        for (var i = 0; i < jobScheduler.WorkerCount; i++)
+        {
+            _threadLocalECBs[i] = new EntityCommandBuffer(_entityManager);
+        }
+
+        // Create the empty archetype
+        CreateArchetype(ReadOnlySpan<Identifier<IComponent>>.Empty, 0);
     }
 
     ~World()
@@ -76,52 +163,103 @@ public partial class World : IDisposable, IEquatable<World>
     }
 
     [MethodImpl(MethodImplOptions.AggressiveInlining)]
-    public CompRef<T> GetSingleton<T>()
-        where T : unmanaged, IComponentData
+    internal Identifier<Archetype> CreateArchetype(ReadOnlySpan<Identifier<IComponent>> componentTypeIDs, int signatureHash)
     {
-        ref var component = ref CollectionsMarshal.GetValueRefOrAddDefault(SingletonContainer<T>.container, _id, out _);
-        return new CompRef<T>(ref component);
-    }
+        var arcID = new Identifier<Archetype>(_archetypes.Count);
+        _archetypes.Add(new Archetype(arcID, _id, componentTypeIDs));
+        _archetypeLookup.Add(signatureHash, arcID);
 
-    [MethodImpl(MethodImplOptions.AggressiveInlining)]
-    public IEnumerable<ScriptComponent> QueryScript()
-    {
-        if (_componentStorage.ScriptComponentPool.IsInitialized)
+        for (int i = 0; i < _entityQueries.Count; i++)
         {
-            return _componentStorage.ScriptComponentPool.ExecutionList!;
+            ref var query = ref _entityQueries[i];
+            query.AddArchetypeIfMatch(in _archetypes[arcID.value]);
         }
 
-        return Enumerable.Empty<ScriptComponent>();
+        return arcID;
     }
 
     [MethodImpl(MethodImplOptions.AggressiveInlining)]
-    [Conditional("GHOST_EDITOR")]
-    public void NotifyComponentChanged(Entity entity, Type type)
+    internal Identifier<Archetype> GetArchetypeIDBySignatureHash(int signatureHash)
     {
-        ComponentChanged?.Invoke(this, entity, type);
+        if (_archetypeLookup.TryGetValue(signatureHash, out var arcID))
+        {
+            return arcID;
+        }
+
+        return Identifier<Archetype>.Invalid;
     }
 
     [MethodImpl(MethodImplOptions.AggressiveInlining)]
-    [Conditional("GHOST_EDITOR")]
-    public void NotifyComponentChanged<T>(Entity entity)
-        where T : unmanaged, IComponentData
+    internal ref Archetype GetArchetypeReference(Identifier<Archetype> id)
     {
-        NotifyComponentChanged(entity, typeof(T));
+        return ref _archetypes[id.value];
+    }
+
+    [MethodImpl(MethodImplOptions.AggressiveInlining)]
+    internal Identifier<EntityQuery> CreateEntityQuery(EntityQueryMask mask, int maskHash)
+    {
+        var queryID = new Identifier<EntityQuery>(_entityQueries.Count);
+        _entityQueries.Add(new EntityQuery(queryID, _id, mask));
+        _querieLookup.Add(maskHash, queryID);
+
+        ref var query = ref _entityQueries[queryID.value];
+        for (var i = 0; i < _archetypes.Count; i++)
+        {
+            query.AddArchetypeIfMatch(in _archetypes[i]);
+        }
+
+        return queryID;
+    }
+
+    [MethodImpl(MethodImplOptions.AggressiveInlining)]
+    internal Identifier<EntityQuery> GetEntityQueryIDByMaskHash(int maskHash)
+    {
+        if (_querieLookup.TryGetValue(maskHash, out var queryID))
+        {
+            return queryID;
+        }
+
+        return Identifier<EntityQuery>.Invalid;
+    }
+
+    [MethodImpl(MethodImplOptions.AggressiveInlining)]
+    internal void PlaybackEntityCommandBuffers()
+    {
+        _entityCommandBuffer.Playback();
+
+        for (var i = 0; i < _threadLocalECBs.Length; i++)
+        {
+            _threadLocalECBs[i].Playback();
+        }
+    }
+
+    [MethodImpl(MethodImplOptions.AggressiveInlining)]
+    internal int AdvanceVersion()
+    {
+        return Interlocked.Increment(ref _version);
+    }
+
+    /// <summary>
+    /// Gets a reference to the entity query with the specified identifier.
+    /// </summary>
+    [MethodImpl(MethodImplOptions.AggressiveInlining)]
+    public ref EntityQuery GetEntityQueryReference(Identifier<EntityQuery> id)
+    {
+        return ref _entityQueries[id.value];
+    }
+
+    /// <summary>
+    /// Gets the thread-local entity command buffer for the specified thread index.
+    /// </summary>
+    [MethodImpl(MethodImplOptions.AggressiveInlining)]
+    public EntityCommandBuffer GetThreadLocalEntityCommandBuffer(int threadIndex)
+    {
+        return _threadLocalECBs[threadIndex];
     }
 
     public bool Equals(World? other)
     {
-        if (other is null)
-        {
-            return false;
-        }
-
-        if (ReferenceEquals(this, other))
-        {
-            return true;
-        }
-
-        return _id == other._id;
+        return other is not null && _id == other._id;
     }
 
     public override int GetHashCode()
@@ -146,19 +284,39 @@ public partial class World : IDisposable, IEquatable<World>
 
     public void Dispose()
     {
-        if (_isDisposed)
+        if (_disposed)
         {
             return;
         }
 
+        foreach (ref var archetype in _archetypes)
+        {
+            archetype.Dispose();
+        }
+
+        foreach (ref var query in _entityQueries)
+        {
+            query.Dispose();
+        }
+
         _entityManager.Dispose();
-        _componentStorage.Dispose();
-        _systemStorage.Dispose();
+        _entityCommandBuffer.Dispose();
+        foreach (var v in _threadLocalECBs)
+        {
+            v.Dispose();
+        }
+
+        _archetypes.Dispose();
+        _entityQueries.Dispose();
+        _archetypeLookup.Dispose();
+        _querieLookup.Dispose();
 
         s_freeWorldSlots.Enqueue(_id);
+        s_worlds[_id] = null;
 
-        _isDisposed = true;
+        _disposed = true;
 
         GC.SuppressFinalize(this);
     }
 }
+

Ghost.Graphics/Core/Material.cs

@@ -1,5 +1,6 @@
 using Ghost.Core;
 using Ghost.Graphics.RHI;
+using Misaki.HighPerformance.LowLevel;
 using Misaki.HighPerformance.LowLevel.Buffer;
 using Misaki.HighPerformance.LowLevel.Collections;
 using System.Runtime.CompilerServices;
@@ -83,15 +84,15 @@ public struct Material : IResourceReleasable, IHandleType
     }
 
     [MethodImpl(MethodImplOptions.AggressiveInlining)]
-    public readonly unsafe Result<T, ResultStatus> GetPropertyCache<T>()
+    public readonly unsafe Result<T, ErrorStatus> GetPropertyCache<T>()
         where T : unmanaged
     {
         if (sizeof(T) != _cBufferCache.Size)
         {
-            return Result.Create(default(T), ResultStatus.InvalidArgument);
+            return ErrorStatus.InvalidArgument;
         }
 
-        return Result.Create(*(T*)_cBufferCache.CpuData.GetUnsafePtr(), ResultStatus.Success);
+        return *(T*)_cBufferCache.CpuData.GetUnsafePtr();
     }
 
     [MethodImpl(MethodImplOptions.AggressiveInlining)]
@@ -106,28 +107,28 @@ public struct Material : IResourceReleasable, IHandleType
     }
 
     [MethodImpl(MethodImplOptions.AggressiveInlining)]
-    public readonly unsafe ResultStatus SetPropertyCache<T>(ref readonly T data)
+    public readonly unsafe ErrorStatus SetPropertyCache<T>(ref readonly T data)
         where T : unmanaged
     {
         if (sizeof(T) != _cBufferCache.Size)
         {
-            return ResultStatus.InvalidArgument;
+            return ErrorStatus.InvalidArgument;
         }
 
         Unsafe.WriteUnaligned(_cBufferCache.CpuData.GetUnsafePtr(), data);
-        return ResultStatus.Success;
+        return ErrorStatus.None;
     }
 
     [MethodImpl(MethodImplOptions.AggressiveInlining)]
-    public readonly unsafe ResultStatus SetRawPropertyCache(ReadOnlySpan<byte> data)
+    public readonly unsafe ErrorStatus SetRawPropertyCache(ReadOnlySpan<byte> data)
     {
         if (data.Length != _cBufferCache.Size)
         {
-            return ResultStatus.InvalidArgument;
+            return ErrorStatus.InvalidArgument;
         }
 
         Unsafe.WriteUnaligned(_cBufferCache.CpuData.GetUnsafePtr(), data);
-        return ResultStatus.Success;
+        return ErrorStatus.None;
     }
 
     [MethodImpl(MethodImplOptions.AggressiveInlining)]

Ghost.Graphics/Core/RenderingContext.cs

@@ -49,7 +49,7 @@ public readonly unsafe ref struct RenderingContext
             CommandBufferType.Graphics => _engine.Device.GraphicsQueue,
             CommandBufferType.Compute => _engine.Device.ComputeQueue,
             CommandBufferType.Copy => _engine.Device.CopyQueue,
-            _ => throw new ArgumentOutOfRangeException(),
+            _ => throw new InvalidOperationException("Unknown command buffer type."),
         };
 
         queue.Submit(commandBuffer);
@@ -123,8 +123,8 @@ public readonly unsafe ref struct RenderingContext
             localToWorld = localToWorld,
             worldBoundsMin = meshData.BoundingBox.Min,
             worldBoundsMax = meshData.BoundingBox.Max,
-            vertexBuffer = _engine.ResourceDatabase.GetBindlessIndex(meshData.VertexBuffer.AsResource()).GetValueOrThrow(ResultStatus.Success),
-            indexBuffer = _engine.ResourceDatabase.GetBindlessIndex(meshData.IndexBuffer.AsResource()).GetValueOrThrow(ResultStatus.Success),
+            vertexBuffer = _engine.ResourceDatabase.GetBindlessIndex(meshData.VertexBuffer.AsResource()).GetValueOrThrow(),
+            indexBuffer = _engine.ResourceDatabase.GetBindlessIndex(meshData.IndexBuffer.AsResource()).GetValueOrThrow(),
         };
 
         var bufferHandle = meshData.ObjectDataBuffer.AsResource();
@@ -147,7 +147,7 @@ public readonly unsafe ref struct RenderingContext
         where T : unmanaged
     {
         var desc = ResourceDatabase.GetResourceDescription(texture.AsResource())
-            .GetValueOrThrow(ResultStatus.Success);
+            .GetValueOrThrow();
 
         if (data.Length * sizeof(T) != desc.TextureDescription.GetTotalBytes())
         {
@@ -180,7 +180,7 @@ public readonly unsafe ref struct RenderingContext
         var shader = ResourceDatabase.GetShaderReference(materialRef.Shader);
 
         var keyResult = shader.TryGetPassKey(passName, out var passIndex);
-        if (keyResult.Status != ResultStatus.Success)
+        if (keyResult.Error != ErrorStatus.None)
         {
             throw new Exception(keyResult.ToString());
         }

Ghost.Graphics/Core/Shader.cs

@@ -101,17 +101,17 @@ public class Shader : IResourceReleasable, IIdentifierType
         return ref _passes[index];
     }
 
-    public RefResult<ShaderPass, ResultStatus> TryGetPassKey(string passName, out int passIndex)
+    public RefResult<ShaderPass, ErrorStatus> TryGetPassKey(string passName, out int passIndex)
     {
         var index = _passLookup.GetValueOrDefault(passName, -1);
         if (index == -1)
         {
             passIndex = -1;
-            return Result.CreateRef(ref Unsafe.NullRef<ShaderPass>(), ResultStatus.NotFound);
+            return ErrorStatus.NotFound;
         }
 
         passIndex = index;
-        return Result.CreateRef(ref _passes[index], ResultStatus.Success);
+        return RefResult<ShaderPass, ErrorStatus>.Success(ref _passes[index]);
     }
 
     void IResourceReleasable.ReleaseResource(IResourceDatabase database)

Ghost.Graphics/D3D12/D3D12CommandBuffer.cs

@@ -130,7 +130,7 @@ internal unsafe class D3D12CommandBuffer : ICommandBuffer
 #if DEBUG
     [DoesNotReturn]
 #endif
-    private void RecordError(string cmdName, ResultStatus status)
+    private void RecordError(string cmdName, ErrorStatus status)
     {
 #if DEBUG
         throw new InvalidOperationException($"Error at {cmdName} with {status}");
@@ -183,7 +183,7 @@ internal unsafe class D3D12CommandBuffer : ICommandBuffer
         _commandList.Get()->Close();
         _isRecording = false;
 
-        if (_lastError.Status != ResultStatus.Success)
+        if (_lastError.Status != ErrorStatus.None)
         {
             return Result.Failure($"Command buffer ended with errors at {_lastError.CommandIndex}, command '{_lastError.CommandName}': {_lastError.Status}");
         }
@@ -220,21 +220,21 @@ internal unsafe class D3D12CommandBuffer : ICommandBuffer
 
             if (!desc.Resource.IsValid)
             {
-                RecordError(nameof(ResourceBarrier), ResultStatus.InvalidArgument);
+                RecordError(nameof(ResourceBarrier), ErrorStatus.InvalidArgument);
                 continue;
             }
 
             var recordResult = _resourceDatabase.GetResourceRecord(desc.Resource);
-            if (recordResult.Status != ResultStatus.Success)
+            if (recordResult.Error != ErrorStatus.None)
             {
-                RecordError(nameof(ResourceBarrier), recordResult.Status);
+                RecordError(nameof(ResourceBarrier), recordResult.Error);
                 continue;
             }
 
             ref var record = ref recordResult.Value;
             if (record.state != desc.StateBefore)
             {
-                RecordError(nameof(ResourceBarrier), ResultStatus.InvalidState);
+                RecordError(nameof(ResourceBarrier), ErrorStatus.InvalidState);
                 continue;
             }
 
@@ -263,9 +263,9 @@ internal unsafe class D3D12CommandBuffer : ICommandBuffer
         }
 
         var recordResult = _resourceDatabase.GetResourceRecord(resource);
-        if (recordResult.Status != ResultStatus.Success)
+        if (recordResult.Error != ErrorStatus.None)
         {
-            RecordError(nameof(ResourceBarrier), recordResult.Status);
+            RecordError(nameof(ResourceBarrier), recordResult.Error);
             return;
         }
 
@@ -284,9 +284,9 @@ internal unsafe class D3D12CommandBuffer : ICommandBuffer
         IncrementCommandCount();
 
         var recordResult = _resourceDatabase.GetResourceRecord(resource);
-        if (recordResult.Status != ResultStatus.Success)
+        if (recordResult.Error != ErrorStatus.None)
         {
-            RecordError(nameof(ResourceBarrier), recordResult.Status);
+            RecordError(nameof(ResourceBarrier), recordResult.Error);
             return;
         }
 
@@ -316,14 +316,14 @@ internal unsafe class D3D12CommandBuffer : ICommandBuffer
             var handle = renderTargets[i];
             if (!handle.IsValid)
             {
-                RecordError(nameof(SetRenderTargets), ResultStatus.InvalidArgument);
+                RecordError(nameof(SetRenderTargets), ErrorStatus.InvalidArgument);
                 continue;
             }
 
             var recordResult = _resourceDatabase.GetResourceRecord(handle.AsResource());
-            if (recordResult.Status != ResultStatus.Success)
+            if (recordResult.Error != ErrorStatus.None)
             {
-                RecordError(nameof(SetRenderTargets), recordResult.Status);
+                RecordError(nameof(SetRenderTargets), recordResult.Error);
                 continue;
             }
 
@@ -337,9 +337,9 @@ internal unsafe class D3D12CommandBuffer : ICommandBuffer
         if (pDsvHandle != null)
         {
             var recordResult = _resourceDatabase.GetResourceRecord(depthTarget.AsResource());
-            if (recordResult.Status != ResultStatus.Success)
+            if (recordResult.Error != ErrorStatus.None)
             {
-                RecordError(nameof(SetRenderTargets), recordResult.Status);
+                RecordError(nameof(SetRenderTargets), recordResult.Error);
                 return;
             }
 
@@ -362,14 +362,14 @@ internal unsafe class D3D12CommandBuffer : ICommandBuffer
             var rtDesc = rtDescs[i];
             if (!rtDesc.Texture.IsValid)
             {
-                RecordError(nameof(BeginRenderPass), ResultStatus.InvalidArgument);
+                RecordError(nameof(BeginRenderPass), ErrorStatus.InvalidArgument);
                 continue;
             }
 
             var recordResult = _resourceDatabase.GetResourceRecord(rtDesc.Texture.AsResource());
-            if (recordResult.Status != ResultStatus.Success)
+            if (recordResult.Error != ErrorStatus.None)
             {
-                RecordError(nameof(BeginRenderPass), recordResult.Status);
+                RecordError(nameof(BeginRenderPass), recordResult.Error);
                 continue;
             }
 
@@ -402,9 +402,9 @@ internal unsafe class D3D12CommandBuffer : ICommandBuffer
         if (pDsvDesc != null)
         {
             var recordResult = _resourceDatabase.GetResourceRecord(depthDesc.Texture.AsResource());
-            if (recordResult.Status != ResultStatus.Success)
+            if (recordResult.Error != ErrorStatus.None)
             {
-                RecordError(nameof(BeginRenderPass), recordResult.Status);
+                RecordError(nameof(BeginRenderPass), recordResult.Error);
                 return;
             }
 
@@ -458,10 +458,10 @@ internal unsafe class D3D12CommandBuffer : ICommandBuffer
         IncrementCommandCount();
 
         var psor = _pipelineLibrary.GetGraphicsPSO(pipelineKey);
-        if (psor.Status != ResultStatus.Success)
+        if (psor.Error != ErrorStatus.None)
         {
 #if DEBUG || GHOST_EDITOR
-            Logger.LogError($"Failed to get graphics pipeline state object for key {pipelineKey}: {psor.Status}");
+            Logger.LogError($"Failed to get graphics pipeline state object for key {pipelineKey}: {psor.Error}");
 #endif
             return;
         }
@@ -487,9 +487,9 @@ internal unsafe class D3D12CommandBuffer : ICommandBuffer
         IncrementCommandCount();
 
         var recordResult = _resourceDatabase.GetResourceRecord(buffer.AsResource());
-        if (recordResult.Status != ResultStatus.Success)
+        if (recordResult.Error != ErrorStatus.None)
         {
-            RecordError(nameof(BeginRenderPass), recordResult.Status);
+            RecordError(nameof(BeginRenderPass), recordResult.Error);
             return;
         }
 
@@ -601,7 +601,7 @@ internal unsafe class D3D12CommandBuffer : ICommandBuffer
         uploadResource.Get()->Map(0, null, &pMappedData);
         fixed (T* pData = data)
         {
-            MemoryUtility.MemCpy(pData, pMappedData, sizeInBytes);
+            MemoryUtility.MemCpy(pMappedData, pData, sizeInBytes);
         }
         uploadResource.Get()->Unmap(0, null);
 
@@ -657,7 +657,7 @@ internal unsafe class D3D12CommandBuffer : ICommandBuffer
         var pSrcResource = _resourceDatabase.GetResource(src.AsResource());
         if (pSrcResource == null || pDestResource == null)
         {
-            RecordError(nameof(CopyBuffer), ResultStatus.InvalidArgument);
+            RecordError(nameof(CopyBuffer), ErrorStatus.InvalidArgument);
             return;
         }
 

Ghost.Graphics/D3D12/D3D12PipelineLibrary.cs

@@ -161,7 +161,7 @@ internal unsafe class D3D12PipelineLibrary : IPipelineLibrary
 
         if (File.Exists(filePath))
         {
-            var fileBytes = File.ReadAllBytes(filePath!);
+            var fileBytes = File.ReadAllBytes(filePath);
             fixed (byte* pFileBytes = fileBytes)
             {
                 ThrowIfFailed(_device.NativeDevice.Get()->CreatePipelineLibrary(pFileBytes, (nuint)fileBytes.Length, __uuidof(pLibrary), (void**)&pLibrary));
@@ -224,7 +224,7 @@ internal unsafe class D3D12PipelineLibrary : IPipelineLibrary
                     RegisterSlot = info.BindPoint,
                     RegisterSpace = info.Space,
                     SizeInBytes = info.Size,
-                    Properties = info.Properties ?? Array.Empty<CBufferPropertyInfo>(),
+                    Properties = info.Properties ?? [],
                 };
             }
         }
@@ -401,14 +401,14 @@ internal unsafe class D3D12PipelineLibrary : IPipelineLibrary
         return key;
     }
 
-    public Result<SharedPtr<ID3D12PipelineState>, ResultStatus> GetGraphicsPSO(GraphicsPipelineKey key)
+    public Result<SharedPtr<ID3D12PipelineState>, ErrorStatus> GetGraphicsPSO(GraphicsPipelineKey key)
     {
         if (_pipelineCache.TryGetValue(key, out var cacheEntry))
         {
-            return Result.Create(new SharedPtr<ID3D12PipelineState>(cacheEntry.pso.Get()), ResultStatus.Success);
+            return cacheEntry.pso.Share();
         }
 
-        return Result.Create(default(SharedPtr<ID3D12PipelineState>), ResultStatus.NotFound);
+        return ErrorStatus.NotFound;
     }
 
     public void Dispose()

Ghost.Graphics/D3D12/D3D12ResourceDatabase.cs

@@ -178,17 +178,17 @@ internal class D3D12ResourceDatabase : IResourceDatabase
         return _resources.Contains(handle.id, handle.generation);
     }
 
-    public RefResult<ResourceRecord, ResultStatus> GetResourceRecord(Handle<GPUResource> handle)
+    public RefResult<ResourceRecord, ErrorStatus> GetResourceRecord(Handle<GPUResource> handle)
     {
         ObjectDisposedException.ThrowIf(_disposed, this);
 
         ref var info = ref _resources.GetElementReferenceAt(handle.id, handle.generation, out var exist);
         if (!exist)
         {
-            return Result.CreateRef(ref Unsafe.NullRef<ResourceRecord>(), ResultStatus.NotFound);
+            return ErrorStatus.NotFound;
         }
 
-        return Result.CreateRef(ref info, ResultStatus.Success);
+        return RefResult<ResourceRecord, ErrorStatus>.Success(ref info);
     }
 
     public ref ResourceRecord GetResourceRecord(Handle<GPUResource> handle, out bool exist)
@@ -202,7 +202,7 @@ internal class D3D12ResourceDatabase : IResourceDatabase
         ObjectDisposedException.ThrowIf(_disposed, this);
 
         var r = GetResourceRecord(handle);
-        if (r.Status != ResultStatus.Success)
+        if (r.Error != ErrorStatus.None)
         {
             return null;
         }
@@ -210,17 +210,17 @@ internal class D3D12ResourceDatabase : IResourceDatabase
         return r.Value.ResourcePtr;
     }
 
-    public Result<ResourceState, ResultStatus> GetResourceState(Handle<GPUResource> handle)
+    public Result<ResourceState, ErrorStatus> GetResourceState(Handle<GPUResource> handle)
     {
         ObjectDisposedException.ThrowIf(_disposed, this);
 
         var r = GetResourceRecord(handle);
-        if (r.Status != ResultStatus.Success)
+        if (!r)
         {
-            return Result.Create(ResourceState.Common, r.Status);
+            return r.Error;
         }
 
-        return Result.Create(r.Value.state, ResultStatus.Success);
+        return r.Value.state;
     }
 
     public void SetResourceState(Handle<GPUResource> handle, ResourceState state)
@@ -236,31 +236,30 @@ internal class D3D12ResourceDatabase : IResourceDatabase
         info.state = state;
     }
 
-    public Result<ResourceDesc, ResultStatus> GetResourceDescription(Handle<GPUResource> handle)
+    public Result<ResourceDesc, ErrorStatus> GetResourceDescription(Handle<GPUResource> handle)
     {
         ObjectDisposedException.ThrowIf(_disposed, this);
 
         var r = GetResourceRecord(handle);
-
-        if (r.Status != ResultStatus.Success)
+        if (!r)
         {
-            return Result.Create(default(ResourceDesc), r.Status);
+            return r.Error;
         }
 
-        return Result.Create(r.Value.desc, ResultStatus.Success);
+        return r.Value.desc;
     }
 
-    public Result<uint, ResultStatus> GetBindlessIndex(Handle<GPUResource> handle)
+    public Result<uint, ErrorStatus> GetBindlessIndex(Handle<GPUResource> handle)
     {
         ObjectDisposedException.ThrowIf(_disposed, this);
 
         ref var info = ref GetResourceRecord(handle, out var exist);
         if (!exist || !info.Allocated)
         {
-            return Result.Create(0u, ResultStatus.NotFound);
+            return ErrorStatus.NotFound;
         }
 
-        return Result.Create((uint)info.viewGroup.srv.value, ResultStatus.Success);
+        return (uint)info.viewGroup.srv.value;
     }
 
     public string? GetResourceName(Handle<GPUResource> handle)

Ghost.Graphics/Ghost.Graphics.csproj

@@ -16,6 +16,12 @@
     <IsTrimmable>True</IsTrimmable>
   </PropertyGroup>
 
+  <ItemGroup>
+    <Compile Remove="RenderGraphModule\**" />
+    <EmbeddedResource Remove="RenderGraphModule\**" />
+    <None Remove="RenderGraphModule\**" />
+  </ItemGroup>
+
   <ItemGroup>
     <None Remove="runtime\win-x64\native\dxcompiler.dll" />
     <None Remove="runtime\win-x64\native\dxil.dll" />
@@ -48,14 +54,4 @@
     <Service Include="{508349b6-6b84-4df5-91f0-309beebad82d}" />
   </ItemGroup>
 
-  <ItemGroup>
-    <Folder Include="RenderGraphModule\" />
-  </ItemGroup>
-
-  <ItemGroup>
-    <Reference Include="Misaki.HighPerformance.LowLevel">
-      <HintPath>..\..\Class\Misaki.HighPerformance\Misaki.HighPerformance.LowLevel\bin\Release\net10.0\Misaki.HighPerformance.LowLevel.dll</HintPath>
-    </Reference>
-  </ItemGroup>
-
 </Project>

Ghost.Graphics/RHI/Common.cs

@@ -98,7 +98,7 @@ internal struct GraphicsPipelineHash
     // Do we need to store blend state?
     // TODO: Variants
 
-    public GraphicsPipelineKey GetKey()
+    public readonly GraphicsPipelineKey GetKey()
     {
         Span<ulong> data = stackalloc ulong[3 + D3D12_SIMULTANEOUS_RENDER_TARGET_COUNT];
         data[0] = Id.value;
@@ -731,7 +731,7 @@ public struct CommandError
         get; set;
     }
 
-    public ResultStatus Status
+    public ErrorStatus Status
     {
         get; set;
     }

Ghost.Graphics/RHI/IResourceDatabase.cs

@@ -39,7 +39,7 @@ public interface IResourceDatabase : IDisposable
     /// </summary>
     /// <param name="handle">The handle that uniquely identifies the resource whose state is to be retrieved.</param>
     /// <returns>A ResourceState Value representing the current state of the resource associated with the specified handle.</returns>
-    Result<ResourceState, ResultStatus> GetResourceState(Handle<GPUResource> handle);
+    Result<ResourceState, ErrorStatus> GetResourceState(Handle<GPUResource> handle);
 
     /// <summary>
     /// Sets the state of the specified resource handle to the given Value.
@@ -53,14 +53,14 @@ public interface IResourceDatabase : IDisposable
     /// </summary>
     /// <param name="handle">A handle that identifies the GPU resource for which to obtain the description. Must reference a valid resource.</param>
     /// <returns>A ResourceDesc structure containing details about the specified GPU resource.</returns>
-    Result<ResourceDesc, ResultStatus> GetResourceDescription(Handle<GPUResource> handle);
+    Result<ResourceDesc, ErrorStatus> GetResourceDescription(Handle<GPUResource> handle);
 
     /// <summary>
     /// Retrieves the bindless index associated with the specified GPU resource handle.
     /// </summary>
     /// <param name="handle">A handle to the GPU resource for which to obtain the bindless index. Must reference a valid, currently registered resource.</param>
     /// <returns>The bindless index corresponding to the specified GPU resource handle. -1 if the resource does not support bindless access or is not found.</returns>
-    Result<uint, ResultStatus> GetBindlessIndex(Handle<GPUResource> handle);
+    Result<uint, ErrorStatus> GetBindlessIndex(Handle<GPUResource> handle);
 
     /// <summary>
     /// Retrieves the name of the GPU resource associated with the specified handle.

Ghost.Graphics/RenderPasses/MeshRenderPass.cs

@@ -27,9 +27,9 @@ internal class MeshRenderPass : IRenderPass
         public uint texture4;
         public uint tex_sampler;
 
-        private uint _padding1;
-        private uint _padding2;
-        private uint _padding3;
+        private readonly uint _padding1;
+        private readonly uint _padding2;
+        private readonly uint _padding3;
     }
 
     private Handle<Mesh> _mesh;
@@ -121,14 +121,14 @@ internal class MeshRenderPass : IRenderPass
         var matProps = new ShaderProperties_MyShader_Standard
         {
             color = new float4(1.0f, 1.0f, 1.0f, 1.0f),
-            texture1 = ctx.ResourceDatabase.GetBindlessIndex(_textures[0].AsResource()).GetValueOrThrow(ResultStatus.Success),
-            texture2 = ctx.ResourceDatabase.GetBindlessIndex(_textures[1].AsResource()).GetValueOrThrow(ResultStatus.Success),
-            texture3 = ctx.ResourceDatabase.GetBindlessIndex(_textures[2].AsResource()).GetValueOrThrow(ResultStatus.Success),
-            texture4 = ctx.ResourceDatabase.GetBindlessIndex(_textures[3].AsResource()).GetValueOrThrow(ResultStatus.Success),
+            texture1 = ctx.ResourceDatabase.GetBindlessIndex(_textures[0].AsResource()).GetValueOrThrow(),
+            texture2 = ctx.ResourceDatabase.GetBindlessIndex(_textures[1].AsResource()).GetValueOrThrow(),
+            texture3 = ctx.ResourceDatabase.GetBindlessIndex(_textures[2].AsResource()).GetValueOrThrow(),
+            texture4 = ctx.ResourceDatabase.GetBindlessIndex(_textures[3].AsResource()).GetValueOrThrow(),
             tex_sampler = (uint)sampler.value,
         };
 
-        Debug.Assert(matRef.SetPropertyCache(in matProps) == ResultStatus.Success);
+        Debug.Assert(matRef.SetPropertyCache(in matProps) == ErrorStatus.None);
         matRef.UploadData(ctx.DirectCommandBuffer);
     }
 

Ghost.Graphics/Utilities/MeshBuilder.cs

@@ -231,7 +231,7 @@ public unsafe static class MeshBuilder
     public static void ComputeTangents(UnsafeList<Vertex> vertices, UnsafeList<uint> indices)
     {
         using var scope = AllocationManager.CreateStackScope();
-        using var bitangents = new UnsafeArray<float4>(vertices.Count, Allocator.Stack);
+        var bitangents = new UnsafeArray<float4>(vertices.Count, scope.AllocationHandle);
 
         for (var i = 0; i < indices.Count; i += 3)
         {

GhostEngine.slnx

@@ -20,7 +20,6 @@
     <Project Path="Ghost.Zeux.MeshOptimizer/Ghost.Zeux.MeshOptimizer.csproj" />
   </Folder>
   <Folder Name="/Runtime/">
-    <Project Path="Ghost.ArcEntities/Ghost.ArcEntities.csproj" />
     <Project Path="Ghost.Core/Ghost.Core.csproj" />
     <Project Path="Ghost.Engine/Ghost.Engine.csproj" />
     <Project Path="Ghost.Entities/Ghost.Entities.csproj" />