Rewrite

Implement the sparse set and entity registry that entt uses/describes

src/Entity.bf

@@ -0,0 +1,31 @@
+namespace Theater_ECS;
+
+using System;
+
+public struct Entity : uint32
+{
+	public static readonly Entity Null => 0x000FFFFF;
+	public static readonly uint32 VersionMask =>  0xFFF00000;
+	public static readonly uint32 IndexMask => 0x000FFFFF;
+	public static readonly uint8 VersionOffset => 20;
+
+	public uint32 Index => (.)this & IndexMask;
+	public uint32 Version => (.)(this & VersionMask) >> VersionOffset
+	public Entity Next => .(Index, Version + 1);
+
+	public this()
+	{
+		this = Entity.Null;
+	};
+
+	public this(uint32 index, uint32 version)
+	{
+		this = (index & IndexMask) | ((version << VersionOffset) & VersionMask);
+
+	}
+
+	public override void ToString(String strBuffer)
+	{
+		strBuffer.Append(scope $"{Index}:{Version}");
+	}
+}

src/EntityRegister.bf

@@ -3,35 +3,6 @@ namespace Theater_ECS;
 using System;
 using System.Collections;
 
-static
-{
-
-	public struct Entity : uint32
-	{
-		public static readonly Entity Null => 0xFFFFF;
-		public static readonly uint32 VersionMask =>  0xFFF00000;
-		public static readonly uint32 IndexMask => 0x000FFFFF;
-		public static readonly uint8 VersionOffset => 20;
-
-		public uint32 Index => (.)this & IndexMask;
-		public uint32 Version => (.)(this & VersionMask) >> VersionOffset
-		public Entity Next => .(Index, Version + 1);
-
-		public this() {};
-
-		public this(uint32 index, uint32 version)
-		{
-			this = (index & IndexMask) | ((version << VersionOffset) & VersionMask);
-
-		}
-
-		public override void ToString(String strBuffer)
-		{
-			strBuffer.Append(scope $"{Index}:{Version}");
-		}
-	}
-}
-
 class EntityRegister
 {
 	private List<Entity> _entities = new .() ~ delete _;
@@ -39,7 +10,7 @@ class EntityRegister
 	private Entity _next = .Null;
 
 
-	public Entity CreateEntity()
+	public Entity Create()
 	{
 		if(_available == 0)
 		{
@@ -59,7 +30,7 @@ class EntityRegister
 		}
 	}
 
-	public void RemoveEntity(Entity e)
+	public void Remove(Entity e)
 	{
 		let temp = _next;
 		_next = .(e.Index, 255);

src/Example/MoverSystem.bf

@@ -7,7 +7,7 @@ class MoverSystem : System
 	[SystemMethod("MoveItems", typeof(Velocity), typeof(Position))]
 	public void MoveItems(ref Velocity v,ref Position p)
 	{
-		//p.x = v.x + p.x;
+		p.x = v.x + p.x;
-		//p.y = v.y = p.y;
+		p.y = v.y = p.y;
 	}
 }

src/Example/Program.bf

@@ -11,53 +11,18 @@ class Program
 
 	public static void Main()
 	{
-		/*
+			EntityRegister e = scope .();
-		Entity e = Entity(45454, 797979790);
+			PagedSparseSet<Position> p = scope .();
-		Console.WriteLine(e);
+			PagedSparseSet<Velocity> v  =scope .();
-		Console.Read();
+			List<Entity> es = new .();
-
+			defer delete es;
-		EntityRegister r = scope .();
+			for(int i < 1000000)
-		while(true)
 			{
-			Console.WriteLine(scope $"Next: {r.[Friend]_next}");
+				var ent = e.Create();
-			for(var i in r.[Friend]_entities)
+				p.Add(ent, .());
-				Console.WriteLine(i);
+				v.Add(ent, .());
-			var l = Console.ReadLine(.. scope .());
+				es.Add(ent);
-
-			Console.Clear();
-
-			if(l == "c")
-				Console.WriteLine(r.CreateEntity());
-			else if(l == "d")
-				r.RemoveEntity(.((.)gRand.Next(0 , r.[Friend]_entities.Count), 0));
-			Console.WriteLine();
 			}
-		*/
-
-		ECS ecs = scope .();
-		var pos = ecs.RegisterComponent<Position>(100);
-		//var waste = ecs.RegisterComponent<waste>(100);
-		var vel = ecs.RegisterComponent<Velocity>(100);
-
-
-		List<Entity> entities = scope .();
-		for(int i < 500000)
-			entities.Add(ecs.CreateEntity());
-
-		for(var i in entities)
-			*(Position*)ecs.AddComponentToEntity(i, pos).Value = .();
-
-		for(var i in entities)
-			*(Velocity*)ecs.AddComponentToEntity(i, vel).Value = .();
-
-		/*
-		for(var i in entities)
-			if(gRand.NextI32() % 2 == 1)
-				*(waste*)ecs.AddComponentToEntity(i, waste).Value = .();
-		*/
-
-		MoverSystem s = scope .();
-		s.IntializeSystem(ecs);
 
 			System.Diagnostics.Stopwatch watch = scope .();
 			for(int a < 10)
@@ -65,9 +30,14 @@ class Program
 				watch.Start();
 				for(int i < 10)
 				{
+					var pos = p.GetAll();
+					var vel = v.GetAll();
 
-				s.RunSystem(ecs);
+					for(var ps in pos)
-				
+					{
+						ps.1.x += vel[@ps.Index].1.x;
+						ps.1.y += vel[@ps.Index].1.y;
+					}
 				}
 				Console.WriteLine(scope $"{watch.ElapsedMilliseconds}ms");
 				watch.Stop();

src/PagedSparseSet.bf

@@ -1,5 +1,77 @@
 namespace Theater_ECS;
 
-class PagedSparseSet<T>
+using System;
+using System.Collections;
+
+class PagedSparseSet<T> where T : struct
 {
+	public const uint32 PageSize = 4096;
+
+	private List<List<Entity>> _sparse = new .()~ DeleteContainerAndItems!(_);
+	private List<(Entity, T)> _packed = new .() ~ delete _;
+	private List<T> _packedEntities = new .() ~ delete _;
+
+	public (Entity, T) this[Entity e]
+	{
+		public get => _packed[_sparse[e.Index/PageSize][e.Index % PageSize].Index];
+	}
+
+	public bool Contains(Entity e)
+	{
+		return _sparse[e.Index/PageSize][e.Index % PageSize] != Entity.Null;
+	}
+
+	public void Add(Entity e, T toAdd)
+	{
+		EnsureLoadedPage(e.Index/PageSize);
+		_packed.Add((e, toAdd));
+		_sparse[e.Index/PageSize][e.Index % PageSize] = (.)_packed.Count-1;
+	}
+
+	public void Remove(Entity e)
+	{
+		EnsurePage(e.Index/PageSize);
+		if(_sparse[e.Index/PageSize] == null)
+			return;
+
+		let toRm = _packed[_sparse[e.Index/PageSize][e.Index % PageSize].Index];
+		let b = _packed.Back;
+		_packed[_sparse[e.Index/PageSize][e.Index % PageSize].Index] = b;
+		_packed.Back = toRm;
+
+		_sparse[b.0.Index/PageSize][b.0.Index % PageSize] = Entity(e.Index, b.0.Version);
+		_sparse[e.Index/PageSize][e.Index % PageSize] = Entity.Null;
+
+		_packed.PopBack();
+	}
+
+	public T* Get(Entity e)
+	{
+		return &_packed[_sparse[e.Index/PageSize][e.Index % PageSize].Index].1;
+	}
+
+	public Span<(Entity, T)> GetAll()
+	{
+		return _packed;
+	}
+
+	///Ensure that a page exist and is loaded
+	public void EnsureLoadedPage(uint32 page)
+	{
+		EnsurePage(page);
+		if(_sparse[page] == null)
+		{
+			_sparse[page] = new List<Entity>(PageSize);
+			_sparse[page].[Friend]Count = 4096;
+			_sparse[page].SetAll(Entity.Null);
+
+		}
+	}
+
+	///Ensure that a page exists, it might be null though
+	private void EnsurePage(uint32 page)
+	{
+		while(_sparse.Count < page+1)
+			_sparse.Add(null);
+	}
 }

src/World.bf

@@ -0,0 +1,12 @@
+namespace Theater_ECS;
+
+using System;
+using System.Collections;
+
+class World
+{
+	EntityRegister Registry = new .() ~ delete _;
+
+	private Dictionary<Type, uint32> _components = new .() ~ delete _;
+	private List<Variant> _componentStorage = new .() ~ DeleteContainerAndDisposeItems!(_);
+}