Implement a "downcastable" wasm resource for ecs resources, cleanup code for exposing asset manager

Cargo.toml

@@ -13,6 +13,8 @@ tokio = { version = "1.41.1", features = ["full"] }
 wasmtime = "26.0.1"
 wasmtime-wasi = "26.0.1"
 lyra-ecs = { path = "./lyra-engine/crates/lyra-ecs" }
+lyra-reflect = { path = "./lyra-engine/crates/lyra-reflect" }
+lyra-engine = { path = "./lyra-engine" }
 slab = "0.4.9"
 thiserror = "2.0.0"
 

csharp-guests.sln

@@ -3,9 +3,7 @@ Microsoft Visual Studio Solution File, Format Version 12.00
 # Visual Studio Version 17
 VisualStudioVersion = 17.0.31903.59
 MinimumVisualStudioVersion = 10.0.40219.1
-Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "LyraApi", "guests/csharp/LyraApi/LyraApi.csproj", "{A4003DF0-C8FF-4A50-A66C-9777E900ED21}"
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "dotnet-guest-test", "guests\csharp\dotnet-guest-test\dotnet-guest-test.csproj", "{68F96E6F-472F-409E-B36E-9C5E7206CCDE}"
-EndProject
-Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "dotnet-guest-test", "guests/csharp/dotnet-guest-test\dotnet-guest-test.csproj", "{68F96E6F-472F-409E-B36E-9C5E7206CCDE}"
 EndProject
 Global
 	GlobalSection(SolutionConfigurationPlatforms) = preSolution

guests/csharp/LyraApi/.gitignore

@@ -1,2 +0,0 @@
-bin
-obj

guests/csharp/LyraApi/Ecs/IComponent.cs

@@ -1,15 +0,0 @@
-using ImportsWorld.wit.imports.lyra.api;
-
-namespace LyraApi.Ecs;
-
-public interface IComponent {
-    public static string HostName { get; }
-    public static ulong HostSize { get; }
-    public static ulong HostAlignment { get; }
-    public static ulong TypeId { get; }
-
-    public IEcs.ComponentInfo GetComponentInfo() {
-        var typeId = new IEcs.WasmTypeId((TypeId, 0));
-        return new IEcs.ComponentInfo(HostName, HostSize, HostAlignment, typeId);
-    }
-}

guests/csharp/LyraApi/Ecs/World.cs

@@ -1,14 +0,0 @@
-namespace LyraApi.Ecs;
-
-using ImportsWorld.wit.imports.lyra.api;
-using LyraApi;
-
-public class World(IEcs.EcsWorld world) {
-    private IEcs.EcsWorld Inner { get; set; } = world;
-
-    public Entity Spawn(params IComponent[] comps) {
-        List<IEcs.ComponentInfo> infos = comps.Select(c => c.GetComponentInfo()).ToList();
-        byte[] bytes = comps.SelectMany(c => Marshalling.GetBytes(c)).ToArray();
-        return new Entity(Inner.Spawn(bytes, infos));
-    }
-}

guests/csharp/LyraApi/LyraApi.csproj

@@ -1,31 +0,0 @@
-<Project Sdk="Microsoft.NET.Sdk">
-
-  <PropertyGroup>
-    <TargetFramework>net9.0</TargetFramework>
-    <RootNamespace>LyraApi</RootNamespace>
-    <ImplicitUsings>enable</ImplicitUsings>
-    <Nullable>enable</Nullable>
-    
-    <RuntimeIdentifier>wasi-wasm</RuntimeIdentifier>
-    <UseAppHost>false</UseAppHost>
-    <PublishTrimmed>true</PublishTrimmed>
-    <InvariantGlobalization>true</InvariantGlobalization>
-    <SelfContained>true</SelfContained>
-    <IlcExportUnmanagedEntrypoints>true</IlcExportUnmanagedEntrypoints>
-    <OutputType>Library</OutputType>
-  </PropertyGroup>
-
-  <ItemGroup>
-    <PackageReference Include="BytecodeAlliance.Componentize.DotNet.Wasm.SDK" Version="0.4.0-preview00007" />
-  </ItemGroup>
-
-  <ItemGroup>
-    <Wit Remove="**\*.wit"  />
-    <Wit Include="wit" World="imports" />
-  </ItemGroup>
-
-  <ItemGroup>
-    <PackageReference Include="runtime.linux-x64.Microsoft.DotNet.ILCompiler.LLVM" Version="10.0.0-alpha.1.24531.4" />
-  </ItemGroup>
-
-</Project>

guests/csharp/LyraApi/nuget.config

@@ -1,9 +0,0 @@
-<?xml version="1.0" encoding="utf-8"?>
-<configuration>
-  <packageSources>
-    <!--To inherit the global NuGet package sources remove the <clear/> line below -->
-    <clear />
-    <add key="dotnet-experimental" value="https://pkgs.dev.azure.com/dnceng/public/_packaging/dotnet-experimental/nuget/v3/index.json" />
-    <add key="nuget" value="https://api.nuget.org/v3/index.json" />
-  </packageSources>
-</configuration>

guests/csharp/LyraApi/wit/ecs.wit

@@ -1,81 +0,0 @@
-package lyra:api;
-
-interface ecs {
-    record entity-id {
-        id: u64,
-    }
-
-    record entity {
-        id: entity-id,
-        generation: u64,
-    }
-
-    record wasm-type-id {
-        // represents a u128, can be converted into that with mem::transmute
-        inner: tuple<u64, u64>,
-    }
-
-    record component-info {
-        host-name: option<string>,
-        /// The size of the component in memory.
-        size: u64,
-        /// The alignment of the component in memory.
-        alignment: u64,
-        /// The type id of the component.
-        ///
-        /// This must be unique between component types since its used to identify the components
-        /// in spawning and querying.
-        type-id: wasm-type-id,
-    }
-
-    resource ecs-dynamic-view {
-        constructor(wrld: borrow<ecs-world>, component-infos: list<component-info>);
-
-        /// Get the bytes of the next row in the view.
-        /// 
-        /// A row contains multiple component serialized as bytes. The buffer is tighly packed.
-        next: func() -> option<tuple<entity, list<u8>>>;
-    }
-
-    resource ecs-world {
-        constructor();
-
-        /// Spawn an entity.
-        ///
-        /// Parameters:
-        /// * `components`: A tightly packed byte buffer containing the components to spawn
-        /// with the entity. This expects the components in the same order of `component-infos`.
-        /// * `component-infos`: A list of `component-infos` uses to identify the components
-        /// and specify the layouts of them.
-        spawn: func(components: list<u8>, component-infos: list<component-info>) -> entity;
-
-        /// Insert components into an existing entity.
-        /// 
-        /// Parameters:
-        /// * `en`: The entity to insert into.
-        /// * `components`: A tightly packed byte buffer containing the components to spawn
-        /// with the entity. This expects the components in the same order of `component-infos`.
-        /// * `component-infos`: A list of `component-infos` uses to identify the components
-        /// and specify the layouts of them.
-        insert: func(en: entity, components: list<u8>, component-infos: list<component-info>);
-
-        /// Query for a list of entities and their components.
-        ///
-        /// Parameters:
-        /// * `component-infos`: The `component-info`'s of the components that you are querying.
-        ///
-        /// Returns: an iterator that returns the byte buffers of each row.
-        view: func(component-infos: list<component-info>) -> ecs-dynamic-view;
-
-        /// Query for components from a single entity.
-        ///
-        /// Parameters:
-        /// * `en`: The entity to query components from.
-        /// * `component-infos`: The `component-info`'s of the components that you are querying.
-        ///
-        /// Returns: A row of components serialized as bytes. The buffer is tighly packed.
-        view-one: func(en: entity, component-infos: list<component-info>) -> option<list<u8>>;
-
-        //with_system: func(stage: string, component-infos: list<component-info>, system: func(components: list<u8>));
-    }
-}

guests/csharp/LyraApi/wit/world.wit

@@ -1,5 +0,0 @@
-package lyra:api;
-
-world imports {
-    import ecs;
-}

guests/csharp/dotnet-guest-test/ExampleWorldImpl.cs

@@ -1,103 +1,48 @@
 namespace ExampleWorld;
 
-using System.Diagnostics.CodeAnalysis;
+using ExampleWorld.wit.imports.lyra.api;
-using System.Runtime.InteropServices;
+using LyraApi.Asset;
-//using ExampleWorld.wit.imports.lyra.api;
-using LyraApi;
 using LyraApi.Ecs;
-using ImportsWorld.wit.imports.lyra.api;
+using LyraApi.Engine;
-
+using LyraApi.Math;
-[StructLayout(LayoutKind.Sequential)]
-struct Vec3(float x, float y, float z) : IComponent
-{
-    /// <summary>
-    /// The X component.
-    /// </summary>
-    public float X { get; set; } = x;
-    /// <summary>
-    /// The Y component
-    /// </summary>
-    public float Y { get; set; } = y;
-    /// <summary>
-    /// The Z component
-    /// </summary>
-    public float Z { get; set; } = z;
-
-    public static string HostName { get => "Vec3"; }
-    public static ulong HostSize { get => (ulong)Marshal.SizeOf<Vec3>(); }
-    public static ulong HostAlignment { get => (ulong)Marshalling.AlignmentOf<Vec3>(); }
-    public static ulong TypeId { get => 4124409524; }
-}
 
 public class ExampleWorldImpl : IExampleWorld
 {
-    internal struct AlignmentHelper<T> where T : unmanaged
-    {
-        public byte Padding;
-        public T Target;
-    }
-
-    private static int AlignmentOf<T>() where T : unmanaged
-    {
-        return (int)Marshal.OffsetOf<AlignmentHelper<T>>(nameof(AlignmentHelper<T>.Target));
-    }
-
-    private static byte[] GetBytes<T>([DisallowNull] T data) {
-        int size = Marshal.SizeOf(data);
-        byte[] arr = new byte[size];
-
-        IntPtr ptr = IntPtr.Zero;
-        try
-        {
-            ptr = Marshal.AllocHGlobal(size);
-            Marshal.StructureToPtr(data, ptr, true);
-            Marshal.Copy(ptr, arr, 0, size);
-        }
-        finally
-        {
-            Marshal.FreeHGlobal(ptr);
-        }
-        return arr;
-    }
-
-    private static T? FromBytes<T>(byte[] data) where T : struct
-    {
-        var ptr = GCHandle.Alloc(data, GCHandleType.Pinned);
-        try {
-            var res = (T?) Marshal.PtrToStructure(ptr.AddrOfPinnedObject(), typeof(T));
-            return res;
-        } finally {
-            ptr.Free();
-
-        }
-    }
-
     public static void OnInit(IEcs.EcsWorld gameWorld, IEcs.Entity owningEntity)
-    {   
+    {
-        var pos = new Vec3(7.0f, 30.0f, 18.0f);
-        var size = new IEcs.WasmTypeId((Vec3.TypeId, 0));
-        var info = new IEcs.ComponentInfo("Vec3", (ulong) Marshal.SizeOf<Vec3>(), (ulong) AlignmentOf<Vec3>(), size);
-        var infos = new List<IEcs.ComponentInfo>
-        {
-            info
-        };
-        
         var world = new World(gameWorld);
-        Entity entity = world.Spawn(pos);
+        Entity entity = world.Spawn(new Vec3(7.0f, 30.0f, 18.0f));
-        Console.WriteLine("C#:   Spawned {0}", entity.Id);
+        Console.WriteLine("C#:   Spawned entity with id {0}", entity.Id);
 
-        IEcs.EcsDynamicView res = gameWorld.View(infos);
+        foreach ((Entity en, Vec3 comp) in world.View<Vec3>())
-        (IEcs.Entity, byte[])? row = res.Next();
+        {
-        
+            Console.WriteLine("C#:   Found entity at ({0}, {1}, {2})", comp.X, comp.Y, comp.Z);
-        if (row.HasValue) {
+        }
-            Console.WriteLine("C#:   Found position!!!");
 
-            var en = row.Value.Item1;
+        /* DeltaTime? dt = world.GetResource<DeltaTime>();
-            var comp = FromBytes<Vec3>(row.Value.Item2);
+        if (dt != null) {
+            Console.WriteLine($"C#:   Delta time: {dt?.Seconds:0.##}");
+        } */
 
-            Console.WriteLine("C#:   Found component at ({0}, {1}, {2})", comp?.X, comp?.Y, comp?.Z);
+        AssetManager? man = world.GetResource<AssetManager>();
-        } else {
+        if (man != null) {
-            Console.WriteLine("C#:   Could not find position");
+            Handle<ImageHandle> han = man.Request<ImageHandle>("test_assets/white.png");
+            Console.WriteLine($"C#:   Asset uuid: {han.Uuid}");
+
+            // wait for asset to load before trying to get the data
+            han.WaitForLoadRecursive();
+            if (!han.IsLoaded)
+            {
+                Console.WriteLine("C#:   Asset is still not loaded, even after waiting!");
+            }
+
+            // will be null if the image hasn't loaded yet
+            ImageHandle? img = han.GetData();
+            Console.WriteLine($"C#:   Size of image: ({img?.Width}, {img?.Height})");
+        }
+        else
+        {
+            Console.WriteLine("C#:   No manager found");
         }
     }
 

guests/csharp/dotnet-guest-test/LyraApi/Asset/AssetManager.cs

@@ -0,0 +1,38 @@
+using LyraApi.Ecs;
+using ExampleWorld.wit.imports.lyra.api;
+using System.Numerics;
+
+namespace LyraApi.Asset;
+
+public class AssetManager(IAsset.AssetManager assetManager) : IResource
+{
+    internal IAsset.AssetManager inner = assetManager;
+
+    public static ulong TypeId => 567234789345;
+
+    public static object? FromWasmResult(IEcs.WorldResourceResult result)
+    {
+        switch (result.Tag)
+        {
+            case IEcs.WorldResourceResult.NONE:
+                return null;
+            case IEcs.WorldResourceResult.WASM_RESOURCE:
+                var handle = IAsset.AssetManager.FromEcsResource(result.AsWasmResource) ?? throw new MismatchedResourceResultException();
+                return new AssetManager(handle);
+            case IEcs.WorldResourceResult.BYTES:
+                return null;
+            default:
+                return null;
+        }
+    }
+
+    public UntypedHandle Request(string path)
+    {
+        return new UntypedHandle(inner.Request(path));
+    }
+
+    public Handle<T> Request<T>(string path) where T : IAssetHandle
+    {
+        return Request(path).AsHandle<T>();
+    }
+}

guests/csharp/dotnet-guest-test/LyraApi/Asset/Handle.cs

@@ -0,0 +1,34 @@
+namespace LyraApi.Asset;
+
+public class Handle<T>(UntypedHandle handle) where T : IAssetHandle
+{
+    internal UntypedHandle inner = handle;
+
+    public bool Watched { get => inner.Watched; }
+    public ulong Version { get => inner.Version; }
+    public Guid Uuid { get => inner.Uuid; }
+    public string? Path { get => inner.Path; }
+    public bool IsLoaded { get => inner.IsLoaded; }
+
+    public void WaitForLoad()
+    {
+        inner.WaitForLoad();
+    }
+
+    public void WaitForLoadRecursive()
+    {
+        inner.WaitForLoadRecursive();
+    }
+
+    public T? GetData()
+    {
+        if (IsLoaded)
+        {
+            return (T?)T.FromRawHandle(inner);
+        }
+        else
+        {
+            return default;
+        }
+    }
+}

guests/csharp/dotnet-guest-test/LyraApi/Asset/IAssetHandle.cs

@@ -0,0 +1,6 @@
+namespace LyraApi.Asset;
+
+public interface IAssetHandle
+{
+    public abstract static object? FromRawHandle(UntypedHandle untypedHandle);
+}

guests/csharp/dotnet-guest-test/LyraApi/Asset/ImageHandle.cs

@@ -0,0 +1,28 @@
+using ExampleWorld.wit.imports.lyra.api;
+
+namespace LyraApi.Asset;
+
+public class ImageHandle(IAsset.ImageHandle handle) : IAssetHandle
+{
+    internal IAsset.ImageHandle inner = handle;
+
+    public uint? Height => inner.Height();
+    public uint? Width => inner.Width();
+
+    public static object? FromRawHandle(UntypedHandle untypedHandle)
+    {
+        var handle = IAsset.ImageHandle.FromRawHandle(untypedHandle.inner);
+        return handle != null ? new ImageHandle(handle) : null;
+    }
+
+    /// <summary>
+    /// Get the image's pixels as native endian bytes.
+    /// </summary>
+    /// 
+    /// Keep in mind that this does copy the image's pixels from the host.
+    /// This is pretty slow.
+    public byte[]? GetImageBytes()
+    {
+        return inner.GetBytes();
+    }
+}

guests/csharp/dotnet-guest-test/LyraApi/Asset/UntypedHandle.cs

@@ -0,0 +1,29 @@
+using ExampleWorld.wit.imports.lyra.api;
+
+namespace LyraApi.Asset;
+
+public class UntypedHandle(IAsset.AssetHandle handle)
+{
+    internal IAsset.AssetHandle inner = handle;
+
+    public bool Watched { get => inner.IsWatched(); }
+    public ulong Version { get => inner.Version(); }
+    public Guid Uuid { get => Guid.Parse(inner.Uuid()); }
+    public string? Path { get => inner.Path(); }
+    public bool IsLoaded { get => inner.IsLoaded(); }
+
+    public void WaitForLoad()
+    {
+        inner.WaitForLoad();
+    }
+
+    public void WaitForLoadRecursive()
+    {
+        inner.WaitRecurseDependenciesLoad();
+    }
+
+    public Handle<T> AsHandle<T>() where T : IAssetHandle
+    {
+        return new Handle<T>(this);
+    }
+}

guests/csharp/dotnet-guest-test/LyraApi/Ecs/Component.cs

@@ -0,0 +1,21 @@
+using System.Reflection;
+using ExampleWorld.wit.imports.lyra.api;
+using LyraApi.Ecs;
+
+public class Component(string hostName, ulong hostSize, ulong hostAlignment, ulong typeId)
+{
+    public string HostName { get; } = hostName;
+    public ulong HostSize { get; } = hostSize;
+    public ulong HostAlignment { get; } = hostAlignment;
+    public ulong TypeId { get; } = typeId;
+
+    public static Component FromComponent<T>() where T : IComponent
+    {
+        return new Component(T.HostName, T.HostSize, T.HostAlignment, T.TypeId);
+    }
+
+    public ComponentInfo GetComponentInfo()
+    {
+        return new ComponentInfo(HostName, HostSize, HostAlignment, TypeId);
+    }
+}

guests/csharp/dotnet-guest-test/LyraApi/Ecs/ComponentInfo.cs

@@ -0,0 +1,31 @@
+using ExampleWorld.wit.imports.lyra.api;
+
+namespace LyraApi.Ecs;
+
+public readonly struct ComponentInfo
+{
+    internal readonly IEcs.ComponentInfo info;
+
+    public readonly string? HostName => info.hostName;
+    public readonly ulong Size => info.size;
+    public readonly ulong Alignment => info.alignment;
+    public readonly ulong TypeId => info.typeId.inner.Item1;
+
+    public ComponentInfo(IEcs.ComponentInfo info)
+    {
+        this.info = info;
+    }
+
+    public ComponentInfo(string hostName, ulong size, ulong alignment, ulong typeId)
+    {
+        var wasmTypeId = new IEcs.WasmTypeId((typeId, 0));
+        this.info = new IEcs.ComponentInfo(hostName, size, alignment, wasmTypeId);
+    }
+
+    public static ComponentInfo FromType<T>() where T : IComponent
+    {
+        var typeId = new IEcs.WasmTypeId((T.TypeId, 0));
+        var info = new IEcs.ComponentInfo(T.HostName, T.HostSize, T.HostAlignment, typeId);
+        return new ComponentInfo(info);
+    }
+}

guests/csharp/dotnet-guest-test/LyraApi/Ecs/Entity.cs

@@ -1,10 +1,11 @@
 namespace LyraApi.Ecs;
-using ImportsWorld.wit.imports.lyra.api;
+using ExampleWorld.wit.imports.lyra.api;
 
-public class Entity(IEcs.Entity entity) {
+public class Entity(IEcs.Entity entity)
+{
     internal IEcs.Entity Inner { get; set; } = entity;
 
     public ulong Id { get => Inner.id.id; }
     public ulong Generation { get => Inner.generation; }
-    
+
 }

guests/csharp/dotnet-guest-test/LyraApi/Ecs/IComponent.cs

@@ -0,0 +1,14 @@
+using System.Data.SqlTypes;
+using ExampleWorld.wit.imports.lyra.api;
+
+namespace LyraApi.Ecs;
+
+public interface IComponent
+{
+    public abstract static string HostName { get; }
+    public abstract static ulong HostSize { get; }
+    public abstract static ulong HostAlignment { get; }
+    public abstract static ulong TypeId { get; }
+
+    public abstract static object? TakeFromBytes(byte[] bytes);
+}

guests/csharp/dotnet-guest-test/LyraApi/Ecs/IResource.cs

@@ -0,0 +1,12 @@
+using static ExampleWorld.wit.imports.lyra.api.IEcs;
+
+namespace LyraApi.Ecs;
+
+public interface IResource
+{
+    public abstract static ulong TypeId { get; }
+
+    public abstract static object? FromWasmResult(WorldResourceResult result);
+}
+
+public class MismatchedResourceResultException : Exception {}

guests/csharp/dotnet-guest-test/LyraApi/Ecs/View.cs

@@ -0,0 +1,20 @@
+using System.ComponentModel;
+using ExampleWorld;
+
+namespace LyraApi.Ecs;
+
+public class View
+{
+    internal List<ComponentInfo> infos;
+
+    private View(List<ComponentInfo> infos)
+    {
+        this.infos = infos;
+    }
+
+    public static View Create<T1>() where T1 : IComponent
+    {
+        List<ComponentInfo> infos = [ComponentInfo.FromType<T1>()];
+        return new View(infos);
+    }
+}

guests/csharp/dotnet-guest-test/LyraApi/Ecs/ViewResult.cs

@@ -0,0 +1,32 @@
+using System.Runtime.InteropServices.Swift;
+using ExampleWorld.wit.imports.lyra.api;
+
+namespace LyraApi.Ecs;
+
+public class ViewResult
+{
+    private List<Component> components;
+    private IEcs.EcsDynamicView inner;
+
+    internal ViewResult(List<Component> components, IEcs.EcsDynamicView inner)
+    {
+        this.components = components;
+        this.inner = inner;
+    }
+
+    public IEnumerable<(Entity, T1)> Get<T1>() where T1 : IComponent
+    {
+        (IEcs.Entity, byte[])? row = inner.Next();
+
+        if (row is (var entity, byte[] bytes))
+        {
+            byte[] compBytes = bytes.Take((int)T1.HostSize).ToArray();
+            var t1 = (T1?)T1.TakeFromBytes(compBytes);
+
+            if (t1 != null)
+            {
+                yield return (new Entity(entity), t1);
+            }
+        }
+    }
+}

guests/csharp/dotnet-guest-test/LyraApi/Ecs/World.cs

@@ -0,0 +1,51 @@
+namespace LyraApi.Ecs;
+
+using ExampleWorld.wit.imports.lyra.api;
+using LyraApi;
+using LyraApi.Asset;
+
+public class World(IEcs.EcsWorld world)
+{
+    internal IEcs.EcsWorld inner = world;
+
+    private Entity Spawn(List<IEcs.ComponentInfo> infos, params object[] comps)
+    {
+        byte[] bytes = comps.SelectMany(c => MarshalUtils.GetBytes(c)).ToArray();
+        return new Entity(inner.Spawn(bytes, infos));
+    }
+
+    public Entity Spawn<T1>(T1 c1) where T1 : IComponent
+    {
+        List<IEcs.ComponentInfo> infos = [ComponentInfo.FromType<T1>().info];
+        return Spawn(infos, c1);
+    }
+
+    public IEnumerable<(Entity, T1)> View<T1>() where T1 : IComponent
+    {
+        List<Component> comps = [Component.FromComponent<T1>()];
+        List<IEcs.ComponentInfo> infos = comps.Select(c => c.GetComponentInfo().info).ToList();
+
+        IEcs.EcsDynamicView dynamicView = inner.View(infos);
+        return new ViewResult(comps, dynamicView).Get<T1>();
+    }
+
+    public T? GetResource<T>() where T : IResource
+    {
+        IEcs.WorldResourceResult result = inner.GetResource(Utils.ToWasmTypeId(T.TypeId));
+        return (T?)T.FromWasmResult(result);
+    }
+
+    /* public AssetManager? GetAssetManager()
+    {
+        IAsset.AssetManager? assetManager = IAsset.AssetManager.FromWorld(inner);
+
+        if (assetManager != null)
+        {
+            return new AssetManager(assetManager);
+        }
+        else
+        {
+            return null;
+        }
+    } */
+}

guests/csharp/dotnet-guest-test/LyraApi/Engine/DeltaTime.cs

@@ -0,0 +1,23 @@
+using System.Runtime.InteropServices;
+using LyraApi;
+using LyraApi.Ecs;
+using static ExampleWorld.wit.imports.lyra.api.IEcs;
+
+namespace LyraApi.Engine;
+
+[StructLayout(LayoutKind.Sequential)]
+public struct DeltaTime : IResource {
+    public float Seconds;
+
+    public static ulong TypeId => 83716348954;
+
+    public static object? FromWasmResult(WorldResourceResult result)
+    {
+        return result.Tag switch
+        {
+            WorldResourceResult.NONE | WorldResourceResult.WASM_RESOURCE => null,
+            WorldResourceResult.BYTES => MarshalUtils.FromBytes<DeltaTime>(result.AsBytes),
+            _ => null,
+        };
+    }
+}

guests/csharp/dotnet-guest-test/LyraApi/MarshalUtils.cs

@@ -3,11 +3,14 @@ namespace LyraApi;
 using System.Diagnostics.CodeAnalysis;
 using System.Runtime.InteropServices;
 
-public static class Marshalling {
+public static class MarshalUtils
+{
     internal struct AlignmentHelper<T> where T : unmanaged
     {
+#pragma warning disable CS0649 // Field is never assigned to, and will always have its default value 0
         public byte Padding;
         public T Target;
+#pragma warning restore CS0649 // Field is never assigned to, and will always have its default value 0
     }
 
     public static int AlignmentOf<T>() where T : unmanaged
@@ -15,7 +18,8 @@ public static class Marshalling {
         return (int)Marshal.OffsetOf<AlignmentHelper<T>>(nameof(AlignmentHelper<T>.Target));
     }
 
-    public static byte[] GetBytes<T>([DisallowNull] T data) {
+    public static byte[] GetBytes<T>([DisallowNull] T data)
+    {
         int size = Marshal.SizeOf(data);
         byte[] arr = new byte[size];
 
@@ -33,13 +37,17 @@ public static class Marshalling {
         return arr;
     }
 
-    public static T? FromBytes<T>(byte[] data) where T : struct
+    public static T? FromBytes<[DynamicallyAccessedMembers(DynamicallyAccessedMemberTypes.PublicConstructors | DynamicallyAccessedMemberTypes.NonPublicConstructors)] T>(byte[] data)
     {
         var ptr = GCHandle.Alloc(data, GCHandleType.Pinned);
-        try {
+        try
-            var res = (T?) Marshal.PtrToStructure(ptr.AddrOfPinnedObject(), typeof(T));
+        {
+            //var res = (T?)Marshal.PtrToStructure(ptr.AddrOfPinnedObject(), typeof(T));
+            var res = Marshal.PtrToStructure<T>(ptr.AddrOfPinnedObject());
             return res;
-        } finally {
+        }
+        finally
+        {
             ptr.Free();
 
         }

guests/csharp/dotnet-guest-test/LyraApi/Math/Vec3.cs

@@ -0,0 +1,32 @@
+using System.Runtime.InteropServices;
+using LyraApi.Ecs;
+
+namespace LyraApi.Math;
+
+[StructLayout(LayoutKind.Sequential)]
+struct Vec3(float x, float y, float z) : IComponent
+{
+    /// <summary>
+    /// The X component.
+    /// </summary>
+    public float X { get; set; } = x;
+    /// <summary>
+    /// The Y component
+    /// </summary>
+    public float Y { get; set; } = y;
+    /// <summary>
+    /// The Z component
+    /// </summary>
+    public float Z { get; set; } = z;
+
+    public static string HostName => "Vec3";
+    public static ulong HostSize => (ulong)Marshal.SizeOf<Vec3>();
+    public static ulong HostAlignment => (ulong)MarshalUtils.AlignmentOf<Vec3>();
+    public static ulong TypeId => 4124409524;
+
+    public static object? TakeFromBytes(byte[] bytes)
+    {
+        byte[] taken = bytes.Take((int)HostSize).ToArray();
+        return MarshalUtils.FromBytes<Vec3>(taken);
+    }
+}

guests/csharp/dotnet-guest-test/LyraApi/Utils.cs

@@ -0,0 +1,8 @@
+using static ExampleWorld.wit.imports.lyra.api.IEcs;
+
+internal static class Utils {
+    public static WasmTypeId ToWasmTypeId(ulong typeId)
+    {
+        return new WasmTypeId((typeId, 0));
+    }
+}

guests/csharp/dotnet-guest-test/dotnet-guest-test.csproj

@@ -12,48 +12,51 @@
     <InvariantGlobalization>true</InvariantGlobalization>
     <SelfContained>true</SelfContained>
     <IlcExportUnmanagedEntrypoints>true</IlcExportUnmanagedEntrypoints>
+
+    <!-- Ignore warning of multiple `PackageReference` items for the `ILCompiler.LLVM` package. -->
+    <NoWarn>$(NoWarn);NU1504</NoWarn>
   </PropertyGroup>
 
   <!-- Copy WIT files from LyraApi to lyra-api wit folder. -->
-  <Target Name="CopyFolderOnBuild" BeforeTargets="WitCompile_InvokeTool">
+  <Target Name="CopyLyraApiWit" BeforeTargets="WitCompile_InvokeTool">
     <ItemGroup>
-      <MyFiles Include="..\LyraApi\wit\**\*.wit" />
+      <MyFiles Include="..\..\rust\common-api\wit\**\*.wit" />
     </ItemGroup>
     <Copy SourceFiles="@(MyFiles)" DestinationFolder="wit\deps\lyraapi\%(RecursiveDir)" />
   </Target>
 
+  <Target Name="CopyComponentGuestWit" BeforeTargets="WitCompile_InvokeTool">
+    <Copy SourceFiles="..\..\rust\witguest\wit\world.wit" DestinationFiles="wit\world.wit" />
+  </Target>
+
   <!-- Remove bindgen of LyraApi WIT .-->
-  <Target Name="RemoveBindgenLyraApi" AfterTargets="WitCompile_InvokeTool">
+  <!-- <Target Name="RemoveBindgenLyraApi" AfterTargets="WitCompile_InvokeTool">
     <ItemGroup>
       <FilesToDelete Include="obj\Debug\net*\wasi-wasm\wit_bindgen\*.lyra.api.*.cs"/>
     </ItemGroup>
     <Delete Files="@(FilesToDelete)" />
-  </Target>
+  </Target> -->
 
   <!-- Reuse bindgen from LyraApi package instead of using local bindgen. -->
-  <Target Name="UpdateLyraApiReferences" AfterTargets="WitCompile_InvokeTool; RemoveBindgenLyraApi">
+  <!-- <Target Name="UpdateLyraApiReferences" AfterTargets="WitCompile_InvokeTool; RemoveBindgenLyraApi">
     <Exec Condition="'$(OS)' == 'Unix'" Command="find obj/Debug -type f -wholename '*wit_bindgen/*.cs' -exec sed -i 's/ExampleWorld\.wit\.imports\.lyra\.api/ImportsWorld.wit.imports.lyra.api/g' {} \;" />
     <Exec Condition="'$(OS)' == 'Windows_NT'" Command="powershell -Command &quot;Get-ChildItem -Path 'obj\Debug' -Recurse -Filter '*.cs' ^ 
         | Where-Object { $_.FullName -match 'wit_bindgen' } ^ 
         | ForEach-Object { (Get-Content -Path $_.FullName) -replace 'ExampleWorld\.wit\.imports\.lyra\.api', 'ImportsWorld.wit.imports.lyra.api' ^ 
         | Set-Content -Path $_.FullName }&quot;" />
-  </Target>
+  </Target> -->
 
   <ItemGroup>
     <PackageReference Include="BytecodeAlliance.Componentize.DotNet.Wasm.SDK" Version="0.4.0-preview00007" />
-  </ItemGroup>
-
-  <ItemGroup>
-    <Wit Remove="**\*.wit"  />
-    <!-- <Wit Include="wit/deps/lyraapi" World="imports" /> -->
-    <Wit Include="wit" World="example" />
-  </ItemGroup>
-
-  <ItemGroup>
     <PackageReference Include="runtime.linux-x64.Microsoft.DotNet.ILCompiler.LLVM" Version="10.0.0-alpha.1.24531.4" />
   </ItemGroup>
 
   <ItemGroup>
-    <ProjectReference Include="..\LyraApi\LyraApi.csproj" />
+    <Wit Remove="**\*.wit"  />
+    <Wit Include="wit" World="example" />
   </ItemGroup>
+
+  <!-- <ItemGroup>
+    <ProjectReference Include="..\LyraApi\LyraApi.csproj" />
+  </ItemGroup> -->
 </Project>

guests/csharp/dotnet-guest-test/wit/deps/lyraapi/asset.wit

@@ -0,0 +1,26 @@
+interface asset {
+    use ecs.{ecs-world, ecs-resource};
+
+    resource asset-handle {
+        version: func() -> u64;
+        uuid: func() -> string;
+        path: func() -> option<string>;
+        is-watched: func() -> bool;
+        is-loaded: func() -> bool;
+        wait-for-load: func();
+        wait-recurse-dependencies-load: func();
+    }
+
+    resource image-handle {
+        from-raw-handle: static func(raw-handle: borrow<asset-handle>) -> option<image-handle>;
+
+        height: func() -> option<u32>;
+        width: func() -> option<u32>;
+        get-bytes: func() -> option<list<u8>>;
+    }
+
+    resource asset-manager {
+        from-ecs-resource: static func(w: borrow<ecs-resource>) -> option<asset-manager>;
+        request: func(path: string) -> asset-handle;
+    }
+}

guests/csharp/dotnet-guest-test/wit/deps/lyraapi/ecs.wit

@@ -37,6 +37,19 @@ interface ecs {
         next: func() -> option<tuple<entity, list<u8>>>;
     }
 
+    /// An resource that can be "downcasted" to a specific type.
+    /// 
+    /// You can use `T.from-ecs-resource` to "downcast" the type
+    resource ecs-resource {
+
+    }
+
+    variant world-resource-result {
+        none,
+        wasm-resource(ecs-resource),
+        bytes(list<u8>),
+    }
+
     resource ecs-world {
         constructor();
 
@@ -76,6 +89,8 @@ interface ecs {
         /// Returns: A row of components serialized as bytes. The buffer is tighly packed.
         view-one: func(en: entity, component-infos: list<component-info>) -> option<list<u8>>;
 
+        get-resource: func(type-id: wasm-type-id) -> world-resource-result;
+
         //with_system: func(stage: string, component-infos: list<component-info>, system: func(components: list<u8>));
     }
 }

guests/csharp/dotnet-guest-test/wit/deps/lyraapi/world.wit

@@ -2,4 +2,5 @@ package lyra:api;
 
 world imports {
     import ecs;
+    import asset;
 }

guests/csharp/dotnet-guest-test/wit/world.wit

@@ -11,6 +11,7 @@ interface math {
 /// An example world for the component to target.
 world example {
     import math;
+    import lyra:api/asset;
     use lyra:api/ecs.{ecs-world, entity};
 
     import host-print: func(msg: string);

guests/rust/common-api/src/lib.rs

@@ -8,6 +8,9 @@ pub use component::*;
 mod bundle;
 pub use bundle::*;
 
+pub mod resource;
+pub use resource::EcsResource;
+
 pub mod math;
 
 pub use api_derive as macros;
@@ -29,6 +32,12 @@ impl WasmTypeId {
             inner: unsafe { mem::transmute(TypeId::of::<T>()) },
         }
     }
+
+    pub const fn from_raw(id: u128) -> Self {
+        Self {
+            inner: unsafe { mem::transmute(id) },
+        }
+    }
 }
 
 enum OwnedBorrow<'a, T> {
@@ -121,6 +130,11 @@ impl<'a> World<'a> {
         self.inner.view_one(en, &infos)
             .map(|bytes| B::from_bytes(bytes))
     }
+
+    pub fn get_resource<T: EcsResource>(&self) -> Option<T> {
+        let res = self.inner.get_resource(T::TYPE_ID);
+        T::from_wasm_result(&res)
+    }
 }
 
 pub struct View<B: Bundle> {

guests/rust/common-api/src/resource/dt.rs

@@ -0,0 +1,27 @@
+use std::ops::Deref;
+
+use crate::lyra::api::ecs::{WasmTypeId, WorldResourceResult};
+use super::EcsResource;
+
+#[derive(Clone, Copy)]
+pub struct DeltaTime(f32);
+
+impl Deref for DeltaTime {
+    type Target = f32;
+
+    fn deref(&self) -> &Self::Target {
+        &self.0
+    }
+}
+
+impl EcsResource for DeltaTime {
+    const TYPE_ID: WasmTypeId = WasmTypeId::from_raw(83716348954);
+
+    fn from_wasm_result(result: &WorldResourceResult) -> Option<Self> {
+        match result {
+            WorldResourceResult::None => None,
+            WorldResourceResult::WasmResource(_) => None,
+            WorldResourceResult::Bytes(vec) => Some(Self(*bytemuck::from_bytes::<f32>(&vec))),
+        }
+    }
+}

guests/rust/common-api/src/resource/mod.rs

@@ -0,0 +1,11 @@
+use crate::lyra::api::ecs::{WasmTypeId, WorldResourceResult};
+
+mod dt;
+pub use dt::*;
+
+pub trait EcsResource: Sized {
+    const TYPE_ID: WasmTypeId;
+
+    fn from_wasm_result(result: &WorldResourceResult) -> Option<Self>;
+}
+

guests/rust/common-api/wit/asset.wit

@@ -0,0 +1,26 @@
+interface asset {
+    use ecs.{ecs-world, ecs-resource};
+
+    resource asset-handle {
+        version: func() -> u64;
+        uuid: func() -> string;
+        path: func() -> option<string>;
+        is-watched: func() -> bool;
+        is-loaded: func() -> bool;
+        wait-for-load: func();
+        wait-recurse-dependencies-load: func();
+    }
+
+    resource image-handle {
+        from-raw-handle: static func(raw-handle: borrow<asset-handle>) -> option<image-handle>;
+
+        height: func() -> option<u32>;
+        width: func() -> option<u32>;
+        get-bytes: func() -> option<list<u8>>;
+    }
+
+    resource asset-manager {
+        from-ecs-resource: static func(w: borrow<ecs-resource>) -> option<asset-manager>;
+        request: func(path: string) -> asset-handle;
+    }
+}

guests/rust/common-api/wit/ecs.wit

@@ -37,6 +37,19 @@ interface ecs {
         next: func() -> option<tuple<entity, list<u8>>>;
     }
 
+    /// An resource that can be "downcasted" to a specific type.
+    /// 
+    /// You can use `T.from-ecs-resource` to "downcast" the type
+    resource ecs-resource {
+
+    }
+
+    variant world-resource-result {
+        none,
+        wasm-resource(ecs-resource),
+        bytes(list<u8>),
+    }
+
     resource ecs-world {
         constructor();
 
@@ -76,6 +89,8 @@ interface ecs {
         /// Returns: A row of components serialized as bytes. The buffer is tighly packed.
         view-one: func(en: entity, component-infos: list<component-info>) -> option<list<u8>>;
 
+        get-resource: func(type-id: wasm-type-id) -> world-resource-result;
+
         //with_system: func(stage: string, component-infos: list<component-info>, system: func(components: list<u8>));
     }
 }

guests/rust/common-api/wit/world.wit

@@ -2,4 +2,5 @@ package lyra:api;
 
 world imports {
     import ecs;
+    import asset;
 }

guests/rust/witguest/src/lib.rs

@@ -1,10 +1,11 @@
-use common_api::{math::{Vec3, Vec4}, World};
+use common_api::{math::{Vec3, Vec4}, resource::DeltaTime, World};
 
 wit_bindgen::generate!({
     world: "example",
 
     with: {
         "lyra:api/ecs": common_api::bindings::lyra::api::ecs,
+        "lyra:api/asset": common_api::bindings::lyra::api::asset,
     },
 });
 
@@ -22,6 +23,9 @@ impl Guest for Component {
             .unwrap().unwrap();
         println!("Found entity at {pos3:?}");
 
+        let dt = world.get_resource::<DeltaTime>().unwrap();
+        println!("dt is {}", *dt);
+
         Ok(())
     }
 

guests/rust/witguest/wit/deps/lyraapi/asset.wit

@@ -0,0 +1,26 @@
+interface asset {
+    use ecs.{ecs-world, ecs-resource};
+
+    resource asset-handle {
+        version: func() -> u64;
+        uuid: func() -> string;
+        path: func() -> option<string>;
+        is-watched: func() -> bool;
+        is-loaded: func() -> bool;
+        wait-for-load: func();
+        wait-recurse-dependencies-load: func();
+    }
+
+    resource image-handle {
+        from-raw-handle: static func(raw-handle: borrow<asset-handle>) -> option<image-handle>;
+
+        height: func() -> option<u32>;
+        width: func() -> option<u32>;
+        get-bytes: func() -> option<list<u8>>;
+    }
+
+    resource asset-manager {
+        from-ecs-resource: static func(w: borrow<ecs-resource>) -> option<asset-manager>;
+        request: func(path: string) -> asset-handle;
+    }
+}

guests/rust/witguest/wit/deps/lyraapi/ecs.wit

@@ -37,6 +37,19 @@ interface ecs {
         next: func() -> option<tuple<entity, list<u8>>>;
     }
 
+    /// An resource that can be "downcasted" to a specific type.
+    /// 
+    /// You can use `T.from-ecs-resource` to "downcast" the type
+    resource ecs-resource {
+
+    }
+
+    variant world-resource-result {
+        none,
+        wasm-resource(ecs-resource),
+        bytes(list<u8>),
+    }
+
     resource ecs-world {
         constructor();
 
@@ -76,6 +89,8 @@ interface ecs {
         /// Returns: A row of components serialized as bytes. The buffer is tighly packed.
         view-one: func(en: entity, component-infos: list<component-info>) -> option<list<u8>>;
 
+        get-resource: func(type-id: wasm-type-id) -> world-resource-result;
+
         //with_system: func(stage: string, component-infos: list<component-info>, system: func(components: list<u8>));
     }
 }

guests/rust/witguest/wit/deps/lyraapi/world.wit

@@ -2,4 +2,5 @@ package lyra:api;
 
 world imports {
     import ecs;
+    import asset;
 }

guests/rust/witguest/wit/world.wit

@@ -11,6 +11,7 @@ interface math {
 /// An example world for the component to target.
 world example {
     import math;
+    import lyra:api/asset;
     use lyra:api/ecs.{ecs-world, entity};
 
     import host-print: func(msg: string);

mise.toml

@@ -0,0 +1,2 @@
+[tools]
+dotnet = "9.0.100-rc.2.24474.11"

src/asset.rs

@@ -0,0 +1,145 @@
+use async_trait::async_trait;
+use wasmtime::component::Resource as WasmResource;
+
+use crate::{lyra, Imports};
+
+use lyra::api::asset as wasm_asset;
+use lyra::api::ecs as wasm_ecs;
+
+impl wasm_asset::Host for Imports {}
+
+#[async_trait]
+impl wasm_asset::HostAssetManager for Imports {
+    async fn from_ecs_resource(&mut self, res: WasmResource<wasm_ecs::EcsResource>) -> Option<WasmResource<wasm_asset::AssetManager>> {
+        let res_rep = res.rep() as u32;
+        let res = self.resource_data_slab.get_mut(res_rep as _)?;
+        res.borrow += 1;
+
+        // ensure that the 
+        if !res.data.is::<lyra_engine::assets::ResourceManager>() {
+            return None;
+        }
+        
+        Some(WasmResource::new_own(res_rep as _))
+    }
+
+    async fn request(
+        &mut self,
+        this: WasmResource<wasm_asset::AssetManager>,
+        path: String,
+    ) -> WasmResource<wasm_asset::AssetHandle> {
+        let man = self.resource_data_slab.get(this.rep() as _)
+            .unwrap()
+            .data.get::<lyra_engine::assets::ResourceManager>();
+        let res = man.request_raw(&path).unwrap();
+        let rep = self.asset_handles_slab.insert(res);
+        WasmResource::new_own(rep as _)
+    }
+
+    async fn drop(&mut self, this: WasmResource<wasm_asset::AssetManager>) -> wasmtime::Result<()> {
+        self.resource_data_slab.drop_ref(this.rep() as _);
+        Ok(())
+    }
+}
+
+#[async_trait]
+impl wasm_asset::HostAssetHandle for Imports {
+    async fn version(&mut self, this: WasmResource<wasm_asset::AssetHandle>) -> u64 {
+        let han = self.asset_handles_slab.get(this.rep() as _)
+            .unwrap();
+        han.version() as u64
+    }
+
+    async fn uuid(&mut self, this: WasmResource<wasm_asset::AssetHandle>) -> String {
+        let han = self.asset_handles_slab.get(this.rep() as _)
+            .unwrap();
+        han.uuid().to_string()
+    }
+
+    async fn path(&mut self, this: WasmResource<wasm_asset::AssetHandle>) -> Option<String> {
+        let han = self.asset_handles_slab.get(this.rep() as _)
+            .unwrap();
+        han.path()
+    }
+
+    async fn is_watched(&mut self, this: WasmResource<wasm_asset::AssetHandle>) -> bool {
+        let han = self.asset_handles_slab.get(this.rep() as _)
+            .unwrap();
+        han.is_watched()
+    }
+
+    async fn is_loaded(&mut self, this: WasmResource<wasm_asset::AssetHandle>) -> bool {
+        let han = self.asset_handles_slab.get(this.rep() as _)
+            .unwrap();
+        han.is_loaded()
+    }
+
+    async fn wait_for_load(&mut self, this: WasmResource<wasm_asset::AssetHandle>) {
+        let han = self.asset_handles_slab.get(this.rep() as _)
+            .unwrap().clone();
+
+        tokio::task::spawn_blocking(move || {
+            han.wait_for_load();
+        }).await.unwrap();
+    }
+
+    async fn wait_recurse_dependencies_load(
+        &mut self,
+        this: WasmResource<wasm_asset::AssetHandle>,
+    ) {
+        let han = self.asset_handles_slab.get(this.rep() as _)
+            .unwrap().clone();
+
+        tokio::task::spawn_blocking(move || {
+            han.wait_recurse_dependencies_load();
+        }).await.unwrap();
+    }
+
+    async fn drop(&mut self, this: WasmResource<wasm_asset::AssetHandle>) -> wasmtime::Result<()> {
+        self.asset_handles_slab.drop_ref(this.rep() as _);
+        Ok(())
+    }
+}
+
+#[async_trait]
+impl wasm_asset::HostImageHandle for Imports {
+    async fn from_raw_handle(&mut self, raw_handle: WasmResource<wasm_asset::AssetHandle>) -> Option<WasmResource<wasm_asset::ImageHandle>> {
+        let untyped = self.asset_handles_slab.get(raw_handle.rep() as _)?;
+        // image will be none if the asset is not an image asset
+        let image = untyped.as_typed::<lyra_engine::assets::Image>();
+        if image.is_some() {
+            let rep = raw_handle.rep();
+            self.asset_handles_slab.increment_ref(rep as _);
+
+            Some(WasmResource::new_own(rep))
+        } else {
+            None
+        }
+    }
+
+    async fn height(&mut self, this: WasmResource<wasm_asset::ImageHandle>) -> Option<u32> {
+        let untyped = self.asset_handles_slab.get(this.rep() as _)?;
+        let image = untyped.as_typed::<lyra_engine::assets::Image>()?;
+        let image = image.data_ref()?;
+        Some(image.height())
+    }
+
+    async fn width(&mut self, this: WasmResource<wasm_asset::ImageHandle>) -> Option<u32> {
+        let untyped = self.asset_handles_slab.get(this.rep() as _)?;
+        let image = untyped.as_typed::<lyra_engine::assets::Image>()?;
+        let image = image.data_ref()?;
+        Some(image.width())
+    }
+
+    async fn get_bytes(&mut self, this: WasmResource<wasm_asset::ImageHandle>) -> Option<Vec<u8>> {
+        let untyped = self.asset_handles_slab.get(this.rep() as _)?;
+        let image = untyped.as_typed::<lyra_engine::assets::Image>()?;
+        let image = image.data_ref()?;
+        Some(image.as_bytes().to_vec())
+    }
+
+    async fn drop(&mut self, this: WasmResource<wasm_asset::ImageHandle>) -> wasmtime::Result<()> {
+        self.asset_handles_slab.drop_ref(this.rep() as _);
+        Ok(())
+    }
+}

src/main.rs

@@ -1,5 +1,7 @@
 use std::alloc::Layout;
+use std::any::TypeId;
 use std::collections::HashMap;
+use std::ops::Deref;
 use std::ptr::NonNull;
 
 use anyhow::{anyhow, Context};
@@ -7,20 +9,29 @@ use async_trait::async_trait;
 use common_api::math::Vec3;
 use component::witguest::math;
 use ecs::query::dynamic::{DynamicViewState, DynamicViewStateIter, QueryDynamicType};
-use lyra_ecs::{query::dynamic::DynamicViewOne, DynTypeId, World};
+use lyra_ecs::{query::dynamic::DynamicViewOne, World};
 
 use lyra_ecs as ecs;
 
+use lyra_engine::DeltaTime;
+use lyra_reflect::{ReflectedResource, TypeRegistry};
 use slab::Slab;
 use thiserror::Error;
 use wasmtime_wasi::{ResourceTable, WasiCtx, WasiCtxBuilder, WasiView};
 
 use wasmtime::component::Resource as WasmResource;
 
+mod proxy;
+pub use proxy::*;
+
+mod asset;
 #[allow(unused_imports)]
+pub use asset::*;
+
+/* #[allow(unused_imports)]
 pub(crate) mod lyra_engine {
     pub use lyra_ecs as ecs;
-}
+} */
 
 wasmtime::component::bindgen!({
     world: "example",
@@ -75,14 +86,87 @@ struct DynamicViewEntry {
     view: DynamicViewStateIter,
 }
 
+#[derive(Clone)]
+pub(crate) struct RefCountedData<T> {
+    pub borrow: u64,
+    pub data: T,
+}
+
+impl<T> std::ops::Deref for RefCountedData<T> {
+    type Target = T;
+
+    fn deref(&self) -> &Self::Target {
+        &self.data
+    }
+}
+
+impl<T> std::ops::DerefMut for RefCountedData<T> {
+    fn deref_mut(&mut self) -> &mut Self::Target {
+        &mut self.data
+    }
+}
+
+/// A Slab of reference counted data.
+pub(crate) struct SlabRcData<T>(Slab<RefCountedData<T>>);
+
+impl<T> From<Slab<RefCountedData<T>>> for SlabRcData<T> {
+    fn from(value: Slab<RefCountedData<T>>) -> Self {
+        Self(value)
+    }
+}
+
+impl<T> std::ops::Deref for SlabRcData<T> {
+    type Target = Slab<RefCountedData<T>>;
+
+    fn deref(&self) -> &Self::Target {
+        &self.0
+    }
+}
+
+impl<T> std::ops::DerefMut for SlabRcData<T> {
+    fn deref_mut(&mut self) -> &mut Self::Target {
+        &mut self.0
+    }
+}
+
+impl<T> SlabRcData<T> {
+    pub fn with_capacity(capacity: usize) -> Self {
+        Self(Slab::with_capacity(capacity))
+    }
+
+    pub fn increment_ref(&mut self, r: usize) {
+        if let Some(count) = self.0.get_mut(r) {
+            count.borrow += 1;
+        }
+    }
+
+    pub fn drop_ref(&mut self, r: usize) {
+        if let Some(count) = self.0.get_mut(r) {
+            // only remove the data from the slab if this is the only borrow
+            if count.borrow == 1 {
+                self.0.remove(r);
+            } else {
+                count.borrow -= 1;
+            }
+        }
+    }
+
+    /// Insert a new reference counted element into the slab.
+    pub fn insert(&mut self, data: T) -> usize {
+        self.0.insert(RefCountedData { borrow: 1, data, })
+    }
+}
+
 unsafe impl Send for DynamicViewEntry {}
 
-struct Imports {
+pub struct Imports {
-    world_slab: Slab<WorldEntry>,
+    pub(crate) world_slab: Slab<WorldEntry>,
-    world_views_slab: Slab<DynamicViewEntry>,
+    pub(crate) world_views_slab: Slab<DynamicViewEntry>,
+    pub(crate) resource_data_slab: SlabRcData<lyra_ecs::ResourceData>,
+    pub(crate) asset_handles_slab: SlabRcData<lyra_engine::assets::UntypedResHandle>,
 
-    ctx: WasiCtx,
+    pub(crate) ctx: WasiCtx,
-    table: ResourceTable,
+    pub(crate) table: ResourceTable,
 }
 
 impl WasiView for Imports {
@@ -137,22 +221,8 @@ impl wasm_ecs::HostEcsWorld for Imports {
         let mut bundle = ecs::DynamicBundle::new();
         let mut offset = 0;
         for info in infos {
-            // get the full u128 from the u64 2-tuple
+            // Try to get the Native type's ComponentInfo.
-            let full_id = unsafe { std::mem::transmute::<_, u128>(info.type_id.inner) };
+            let info = lookup.lookup_info(info.into());
-            // Try to get the Native type's ComponentInfo. If something is found, verify that
-            // the size and alignment match.
-            let info = match lookup.0.get(&full_id) {
-                Some(native) => {
-                    let native_align = native.layout().align() as u64;
-                    let native_size = native.layout().size() as u64;
-                    
-                    assert_eq!(native_align, info.alignment, "Native type alignment is different then scripting type alignment!");
-                    assert_eq!(native_size, info.size, "Native type size is different then scripting type size!");
-                    
-                    native.clone()
-                },
-                None => info.into()
-            };
 
             // SAFETY: The components are tightly packed. Adding the offset to the pointer will
             // get the next component in the buffer.
@@ -255,6 +325,43 @@ impl wasm_ecs::HostEcsWorld for Imports {
         }
     }
 
+    async fn get_resource(&mut self, this: wasmtime::component::Resource<wasm_ecs::EcsWorld>, type_id: wasm_ecs::WasmTypeId) -> wasm_ecs::WorldResourceResult {
+        let world_entry = self
+            .world_slab
+            .get(this.rep() as _)
+            .ok_or(WasmError::InvalidResourceHandle("EcsWorld")).unwrap();
+        let world = &world_entry.world;
+
+        let native_tid = {
+            let native_type = world.get_resource::<GuestTypeLookup>().unwrap();
+            native_type.lookup_type_id(type_id)
+                .expect("failed to find native type id of wasm type")
+        };
+
+        let data = {
+            let reg = world.get_resource::<TypeRegistry>().unwrap();
+            reg.get_type(native_tid).unwrap().clone()
+        };
+
+        let proxy = data.get_data::<WasmProxied>().unwrap().clone();        
+        let refl = data.get_data::<ReflectedResource>().unwrap().clone();
+
+        // SAFETY: reflecting the resource borrows from a different part of the world
+        // then marshaling would.
+        let w = NonNull::from(world);
+        let world = unsafe { w.as_ref() };
+        let refl = refl.reflect(world).unwrap();
+        let res = proxy.marshal_to_bytes(self, this.rep(), refl.deref());
+
+        match res {
+            ProxyResult::None => wasm_ecs::WorldResourceResult::None,
+            ProxyResult::Bytes(bytes) => wasm_ecs::WorldResourceResult::Bytes(bytes),
+            ProxyResult::WasmResource(data) => {
+                let rep = self.resource_data_slab.insert(data);
+                wasm_ecs::WorldResourceResult::WasmResource(WasmResource::new_own(rep as _))
+            }
+        }
+    }
 
     async fn drop(
         &mut self,
@@ -283,11 +390,25 @@ impl wasm_ecs::HostEcsDynamicView for Imports {
         world: WasmResource<wasm_ecs::EcsWorld>,
         infos: Vec<wasm_ecs::ComponentInfo>,
     ) -> wasmtime::component::Resource<wasm_ecs::EcsDynamicView> {
-        // Create a dynamic view for querying for the components
+        
-        let mut view = DynamicViewState::new();
+        // Create the view state
-        for info in infos.clone() {
+        let view = {
-            view.push(QueryDynamicType::from_info(info.into()));
+            let world_entry = self
-        }
+                .world_slab
+                .get_mut(world.rep() as _)
+                .ok_or(WasmError::InvalidResourceHandle("EcsWorld"))
+                .unwrap();
+            let lookup = world_entry.world.get_resource::<GuestTypeLookup>().unwrap();
+            
+            // Create a dynamic view for querying for the components
+            let mut view = DynamicViewState::new();
+            for info in infos.clone() {
+                let info = lookup.lookup_info(info.into());
+                view.push(QueryDynamicType::from_info(info));
+            }
+
+            view
+        };
 
         let world_rep = world.rep();
         let entry = DynamicViewEntry {
@@ -362,41 +483,52 @@ impl wasm_ecs::HostEcsDynamicView for Imports {
     }
 }
 
-/* fn dynamic_view_next_impl() -> Option<(Entity, Vec<u8>)> {
-    // get the next row in the view and copy the returned components into a tightly packed
-    if let Some((en, row)) = view.next(&world_entry.world) {
-        let row_len = row.iter().map(|d| d.info.layout().size()).sum();
-        let mut row_buf = Vec::<u8>::with_capacity(row_len);
-
-        let mut offset = 0;
-        for comp in row {
-            let comp_size = comp.info.layout().size();
-            unsafe {
-                // SAFETY: the vec has the capacity to store this component because it was
-                // created with Vec::with_capacity.
-                let dst = row_buf.as_mut_ptr().add(offset);
-
-                std::ptr::copy_nonoverlapping(
-                    comp.ptr.as_ptr(),
-                    dst,
-                    comp.info.layout().size(),
-                );
-
-                // make sure to tell the vec that it now has the bytes of this component
-                row_buf.set_len(row_buf.len() + comp_size);
-            }
-
-            offset += comp_size;
-        }
-
-        Some((en.into(), row_buf))
-    } else {
-        None
-    }
-} */
-
 #[derive(Default, Clone)]
-struct GuestTypeLookup(HashMap<u128, lyra_ecs::ComponentInfo>);
+struct GuestTypeLookup {
+    infos: HashMap<u128, lyra_ecs::ComponentInfo>,
+    type_ids: HashMap<u128, TypeId>,
+}
+
+impl GuestTypeLookup {
+    /// Try to find the native type's component info.
+    /// 
+    /// If the wasm type id does not correspond to a native type's info, the provided `ComponentInfo`
+    /// will be returned. If info is found, the size and alignment will be verified to match using
+    /// asserts and the info of the native type will be returned.
+    fn lookup_info(&self, info: lyra_ecs::ComponentInfo) -> lyra_ecs::ComponentInfo {
+        match self.infos.get(&info.type_id().as_unknown().unwrap()) {
+            Some(native) => {
+                let native_align = native.layout().align() as usize;
+                let native_size = native.layout().size() as usize;
+                
+                let layout = info.layout();
+                assert_eq!(native_align, layout.align(), "Native type alignment is different then scripting type alignment!");
+                assert_eq!(native_size, layout.size(), "Native type size is different then scripting type size!");
+                
+                native.clone()
+            },
+            None => info
+        }
+    }
+
+    fn lookup_type_id(&self, wasm_id: wasm_ecs::WasmTypeId) -> Option<TypeId> {
+        // SAFETY: a (u64, u64) is the same as a u128
+        let id: u128 = unsafe { std::mem::transmute(wasm_id) };
+        self.type_ids.get(&id).cloned()
+    }
+}
+
+#[async_trait]
+impl wasm_ecs::HostEcsResource for Imports {
+    async fn drop(
+        &mut self,
+        this: wasmtime::component::Resource<wasm_ecs::EcsResource>,
+    ) -> wasmtime::Result<()> {
+        self.resource_data_slab.drop_ref(this.rep() as _);
+
+        Ok(())
+    }
+}
 
 #[async_trait]
 impl wasm_ecs::Host for Imports {}
@@ -412,12 +544,8 @@ async fn main() -> wasmtime::Result<()> {
     // Configure the linker
     let mut linker = wasmtime::component::Linker::new(&engine);
 
-    //wasmtime_wasi::preview0::add_to_linker_sync(&mut linker, |s| s)?;
-    //wasmtime_wasi::bindings::Imports::add_to_linker(&mut linker, |s| s)?;
     wasmtime_wasi::add_to_linker_async(&mut linker)?;
     Example::add_to_linker(&mut linker, |s| s)?;
-    //lyra::api::ecs::add_to_linker(&mut linker, |s| s)?;
-    //Api::add_to_linker(&mut linker, |s| s)?;
 
     let mut builder = WasiCtxBuilder::new();
     builder.inherit_stdio();
@@ -429,6 +557,8 @@ async fn main() -> wasmtime::Result<()> {
             // wants another world for some reason.
             world_slab: Slab::with_capacity(1),
             world_views_slab: Slab::with_capacity(10),
+            resource_data_slab: SlabRcData::with_capacity(25),
+            asset_handles_slab: SlabRcData::with_capacity(25),
             ctx: builder.build(),
             table: ResourceTable::new(),
         },
@@ -439,13 +569,24 @@ async fn main() -> wasmtime::Result<()> {
     let bytes = std::fs::read("guests/csharp/dotnet-guest-test/bin/Debug/net9.0/wasi-wasm/native/dotnet-guest-test.wasm")?;
     let component = wasmtime::component::Component::new(&engine, bytes)?;
 
-    let (script_en, (world_res_a, world_res_b)) = {
+    let (script_en, (world_res_a, _)) = {
         let mut world = World::new();
+
+        world.add_resource(DeltaTime::from(100.00));
+        world.add_resource(lyra_engine::assets::ResourceManager::default());
         
         let mut lookup = GuestTypeLookup::default();
-        lookup.0.insert(4124409524, lyra_ecs::ComponentInfo::new::<Vec3>());
+        lookup.infos.insert(4124409524, lyra_ecs::ComponentInfo::new::<Vec3>());
+        lookup.type_ids.insert(83716348954, TypeId::of::<lyra_engine::DeltaTime>());
+        lookup.type_ids.insert(567234789345, TypeId::of::<lyra_engine::assets::ResourceManager>());
         world.add_resource(lookup);
 
+        {
+            let mut reg = world.get_resource_or_default::<TypeRegistry>();
+            add_proxy_type_data::<DeltaTime>(&mut reg);
+            add_proxy_type_data::<lyra_engine::assets::ResourceManager>(&mut reg);
+        }
+
         let script_en = world.spawn(());
 
         let data = store.data_mut();
@@ -466,35 +607,6 @@ async fn main() -> wasmtime::Result<()> {
     call_script_stage_async(&mut store, &instance, "init", world_res_a, script_en.into()).await?;
     //call_script_stage_async(&mut store, &instance, "update", world_res_b, script_en.into()).await?;
     println!("RUST: Guest is done");
-    
-    let rep = world_res_b.rep();
-    let w = store.data().world_slab.get(rep as _).unwrap();
-    let w = &w.world;
-    println!("RUST: Got {} archetypes", w.archetype_count());
-    for a in w.archetypes.values() {
-        println!("RUST: Archetype {}", a.id().0);
-        for col in &a.columns {
-            println!("RUST:   Column type id: {:?}", col.info.type_id());
-
-            if col.info.type_id().is_id(DynTypeId::Unknown(4124409524)) {
-                println!("RUST:     Found C# Vec3");
-                let pos = unsafe { col.get::<Vec3>(0) };
-                println!("RUST:     Entity 0 pos: {:?}", *pos);
-            }
-        }
-    }
-
-    let mut dv = w.dynamic_view();
-    dv.push(QueryDynamicType::from_info(lyra_ecs::ComponentInfo::new::<Vec3>()));
-    let iter = dv.into_iter();
-
-    for (_, comps) in iter {
-        let first = comps.first().unwrap();
-        unsafe {
-            let v: Vec3 = std::ptr::read(first.ptr.as_ptr() as _);
-            println!("RUST: Found native Vec3! {:?}", v);
-        }
-    }
 
     Ok(())
 }

src/proxy.rs

@@ -0,0 +1,64 @@
+use std::any::TypeId;
+
+use crate::Imports;
+use common_api::bytemuck;
+use lyra_engine::DeltaTime;
+use lyra_reflect::{FromType, Reflect, ReflectedResource, TypeRegistry};
+
+pub enum ProxyResult {
+    None,
+    WasmResource(lyra_ecs::ResourceData),
+    Bytes(Vec<u8>)
+}
+
+pub trait WasmProxy {
+    fn marshal_to_bytes(&self, imports: &mut Imports, world_idx: u32) -> ProxyResult;
+}
+
+#[derive(Clone)]
+pub struct WasmProxied {
+    fn_marshal: for<'a> fn (&mut Imports, world_idx: u32, &'a dyn Reflect) -> ProxyResult,
+}
+
+impl WasmProxied {
+    pub fn marshal_to_bytes(&self, imports: &mut Imports, world_idx: u32, reflected: &dyn Reflect) -> ProxyResult {
+        (self.fn_marshal)(imports, world_idx, reflected)
+    }
+}
+
+impl<T> FromType<T> for WasmProxied
+where 
+    T: WasmProxy + 'static
+{
+    fn from_type() -> Self {
+        WasmProxied {
+            fn_marshal: |imports, world_idx: u32, reflect| {
+                let this: &T = reflect.as_any().downcast_ref().unwrap();
+                this.marshal_to_bytes(imports, world_idx)
+            }
+        }
+    }
+}
+
+pub fn add_proxy_type_data<T: WasmProxy + lyra_ecs::ResourceObject + lyra_reflect::Reflect>(reg: &mut TypeRegistry) {
+    let ty = reg.get_type_or_default(TypeId::of::<T>());
+    ty.add_data(<ReflectedResource as FromType::<T>>::from_type());
+    ty.add_data(<WasmProxied as FromType::<T>>::from_type());
+}
+
+impl WasmProxy for DeltaTime {
+    fn marshal_to_bytes(&self, _: &mut Imports, _: u32) -> ProxyResult {
+        ProxyResult::Bytes(bytemuck::bytes_of(&**self).to_vec())
+    }
+}
+
+impl WasmProxy for lyra_engine::assets::ResourceManager {
+    fn marshal_to_bytes(&self, imports: &mut Imports, world_idx: u32) -> ProxyResult {
+        let world = &imports.world_slab.get(world_idx as _)
+            .unwrap().world;
+        match world.get_resource_data::<Self>() {
+            Some(data) => ProxyResult::WasmResource(data),
+            None => ProxyResult::None,
+        }
+    }
+}