Merge pull request 'Fix #19: Lua crashes when spawning entities in optimized builds' (#27) from fix/scripting-switch-to-mlua into main

Reviewed-on: #27

.vscode/launch.json

@@ -4,6 +4,24 @@
     // For more information, visit: https://go.microsoft.com/fwlink/?linkid=830387
     "version": "0.2.0",
     "configurations": [
+        {
+            "type": "lldb",
+            "request": "launch",
+            "name": "Debug lyra lua-scripting",
+            "cargo": {
+                "args": [
+                    "build",
+                    "--manifest-path", "${workspaceFolder}/examples/lua-scripting/Cargo.toml"
+                    //"--bin=testbed",
+                ],
+                "filter": {
+                    "name": "lua-scripting",
+                    "kind": "bin"
+                }
+            },
+            "args": [],
+            "cwd": "${workspaceFolder}/examples/lua-scripting"
+        },
         {
             "type": "lldb",
             "request": "launch",

examples/lua-scripting/scripts/test.lua

@@ -1,9 +1,18 @@
----Return the userdata's name from its metatable
+---Return the userdata's name from its metatable.
+---
+---Returns nil if the userdata doesn't have a metatable.
 ---@param val userdata
----@return string
+---@return string|nil
 function udname(val)
-    return getmetatable(val).__name
+    local tbl = debug.getmetatable(val)
+
+    if tbl == nil then
+        return nil
+    end
+
+    return tbl.__name
 end
+ 
 
 function on_init()
     local cube = world:request_res("../assets/cube-texture-embedded.gltf")

examples/lua-scripting/src/main.rs

@@ -1,6 +1,6 @@
 use lyra_engine::{
     assets::{gltf::Gltf, ResourceManager},
-    game::Game,
+    game::App,
     input::{
         Action, ActionHandler, ActionKind, ActionMapping, ActionMappingId, ActionSource,
         InputActionPlugin, KeyCode, LayoutId, MouseAxis, MouseInput,
@@ -33,75 +33,73 @@ async fn main() {
                     .bind(
                         ACTLBL_MOVE_FORWARD_BACKWARD,
                         &[
-                            ActionSource::Keyboard(KeyCode::W).into_binding_modifier(1.0),
-                            ActionSource::Keyboard(KeyCode::S).into_binding_modifier(-1.0),
+                            ActionSource::Keyboard(KeyCode::KeyW).into_binding_modifier(1.0),
+                            ActionSource::Keyboard(KeyCode::KeyS).into_binding_modifier(-1.0),
                         ],
                     )
                     .bind(
                         ACTLBL_MOVE_LEFT_RIGHT,
                         &[
-                            ActionSource::Keyboard(KeyCode::A).into_binding_modifier(-1.0),
-                            ActionSource::Keyboard(KeyCode::D).into_binding_modifier(1.0),
+                            ActionSource::Keyboard(KeyCode::KeyA).into_binding_modifier(-1.0),
+                            ActionSource::Keyboard(KeyCode::KeyD).into_binding_modifier(1.0),
                         ],
                     )
                     .bind(
                         ACTLBL_MOVE_UP_DOWN,
                         &[
-                            ActionSource::Keyboard(KeyCode::C).into_binding_modifier(1.0),
-                            ActionSource::Keyboard(KeyCode::Z).into_binding_modifier(-1.0),
+                            ActionSource::Keyboard(KeyCode::KeyC).into_binding_modifier(1.0),
+                            ActionSource::Keyboard(KeyCode::KeyZ).into_binding_modifier(-1.0),
                         ],
                     )
                     .bind(
                         ACTLBL_LOOK_LEFT_RIGHT,
                         &[
                             ActionSource::Mouse(MouseInput::Axis(MouseAxis::X)).into_binding(),
-                            ActionSource::Keyboard(KeyCode::Left).into_binding_modifier(-1.0),
-                            ActionSource::Keyboard(KeyCode::Right).into_binding_modifier(1.0),
+                            ActionSource::Keyboard(KeyCode::ArrowLeft).into_binding_modifier(-1.0),
+                            ActionSource::Keyboard(KeyCode::ArrowRight).into_binding_modifier(1.0),
                         ],
                     )
                     .bind(
                         ACTLBL_LOOK_UP_DOWN,
                         &[
                             ActionSource::Mouse(MouseInput::Axis(MouseAxis::Y)).into_binding(),
-                            ActionSource::Keyboard(KeyCode::Up).into_binding_modifier(-1.0),
-                            ActionSource::Keyboard(KeyCode::Down).into_binding_modifier(1.0),
+                            ActionSource::Keyboard(KeyCode::ArrowUp).into_binding_modifier(-1.0),
+                            ActionSource::Keyboard(KeyCode::ArrowDown).into_binding_modifier(1.0),
                         ],
                     )
                     .bind(
                         ACTLBL_LOOK_ROLL,
                         &[
-                            ActionSource::Keyboard(KeyCode::E).into_binding_modifier(-1.0),
-                            ActionSource::Keyboard(KeyCode::Q).into_binding_modifier(1.0),
+                            ActionSource::Keyboard(KeyCode::KeyE).into_binding_modifier(-1.0),
+                            ActionSource::Keyboard(KeyCode::KeyQ).into_binding_modifier(1.0),
                         ],
                     )
                     .bind(
                         "Debug",
-                        &[ActionSource::Keyboard(KeyCode::B).into_binding()],
+                        &[ActionSource::Keyboard(KeyCode::KeyB).into_binding()],
                     )
                     .finish(),
             )
             .finish();
 
-        let world = game.world_mut();
+        let world = &mut app.world;
         world.add_resource(action_handler);
-        game.with_plugin(InputActionPlugin);
+        app.with_plugin(InputActionPlugin);
     };
 
-    Game::initialize()
-        .await
-        .with_plugin(lyra_engine::DefaultPlugins)
-        .with_plugin(setup_scene_plugin)
-        .with_plugin(action_handler_plugin)
-        .with_plugin(setup_script_plugin)
-        //.with_plugin(camera_debug_plugin)
-        .with_plugin(FreeFlyCameraPlugin)
-        .run()
-        .await;
+    let mut app = App::new();
+    app.with_plugin(lyra_engine::DefaultPlugins);
+    app.with_plugin(setup_scene_plugin);
+    app.with_plugin(action_handler_plugin);
+    app.with_plugin(setup_script_plugin);
+    //app.with_plugin(camera_debug_plugin);
+    app.with_plugin(FreeFlyCameraPlugin);
+    app.run();
 }
 
 fn setup_scene_plugin(app: &mut App) {
-    let world = game.world_mut();
-    let resman = world.get_resource_mut::<ResourceManager>();
+    let world = &mut app.world;
+    let resman = world.get_resource_mut::<ResourceManager>().unwrap();
     let camera_gltf = resman
         .request::<Gltf>("../assets/AntiqueCamera.glb")
         .unwrap();
@@ -137,10 +135,10 @@ fn setup_scene_plugin(app: &mut App) {
 }
 
 fn setup_script_plugin(app: &mut App) {
-    game.with_plugin(LuaScriptingPlugin);
+    app.with_plugin(LuaScriptingPlugin);
 
-    let world = game.world_mut();
-    let res_man = world.get_resource_mut::<ResourceManager>();
+    let world = &mut app.world;
+    let res_man = world.get_resource_mut::<ResourceManager>().unwrap();
     let script = res_man.request::<LuaScript>("scripts/test.lua").unwrap();
     res_man.watch("scripts/test.lua", false).unwrap();
     drop(res_man);

lyra-ecs/src/world.rs

@@ -509,7 +509,11 @@ impl World {
     /// Attempts to find a resource in the world and returns a NonNull pointer to it
     pub unsafe fn get_resource_ptr<T: ResourceObject>(&self) -> Option<NonNull<T>> {
         self.resources.get(&TypeId::of::<T>())
-            .map(|d| unsafe { NonNull::new_unchecked(d.data.as_ptr() as *mut T) })
+            .map(|d| unsafe {
+                let data = d.data.borrow();
+                let ptr = NonNull::from(&data.res);
+                NonNull::new_unchecked(ptr.as_ptr() as *mut T)
+            })
     }
 
     pub fn archetype_count(&self) -> usize {

lyra-game/src/game.rs

@@ -72,7 +72,7 @@ impl App {
             t.with(filter::Targets::new()
                     // done by prefix, so it includes all lyra subpackages
                     .with_target("lyra", Level::DEBUG)
-                    .with_target("wgsl_preprocessor", Level::DEBUG)
+                    .with_target("wgsl_preprocessor", Level::INFO)
                     .with_target("wgpu", Level::WARN)
                     .with_target("winit", Level::DEBUG)
                     .with_default(Level::INFO))

lyra-game/src/input/system.rs

@@ -21,6 +21,12 @@ fn write_scroll_delta(mouse_scroll_ev: &mut EventWriter<MouseScroll>, delta: &Mo
     mouse_scroll_ev.write(event);
 }
 
+fn write_key_event(key_buttons: &mut ResMut<InputButtons<winit::keyboard::KeyCode>>, physical_key: winit::keyboard::PhysicalKey, state: winit::event::ElementState) {
+    if let PhysicalKey::Code(code) = physical_key {
+        key_buttons.add_input_from_winit(code, state);
+    }
+}
+
 pub fn input_system(
     mut key_code_res: ResMut<InputButtons<winit::keyboard::KeyCode>>,
     mut mouse_btn_res: ResMut<InputButtons<MouseButton>>,
@@ -37,9 +43,7 @@ pub fn input_system(
     while let Some(event) = window_ev.read() {
         match event.deref() {
             WindowEvent::KeyboardInput { event, .. } => {
-                if let PhysicalKey::Code(code) = event.physical_key {
-                    key_code_res.add_input_from_winit(code, event.state);
-                }
+                write_key_event(&mut key_code_res, event.physical_key, event.state);
             },
             WindowEvent::CursorMoved { position, .. } => {
                 let exact = MouseExact {
@@ -100,6 +104,9 @@ pub fn input_system(
             winit::event::DeviceEvent::MouseWheel { delta } => {
                 write_scroll_delta(&mut mouse_scroll_ev, delta);
             },
+            winit::event::DeviceEvent::Key(key) => {
+                write_key_event(&mut key_code_res, key.physical_key, key.state);
+            },
             _ => {
                 todo!("unhandled device event: {:?}", device.event);
             }

lyra-reflect/src/impls/impl_std.rs

@@ -37,13 +37,13 @@ impl_reflect_trait_value!(String);
 impl_reflect_trait_value!(::core::option::Option<T: Clone + Reflect>);
 impl_reflect_trait_value!(::core::result::Result<T: Clone + Reflect, E: Clone + Reflect>);
 
-impl_reflect_trait_value!(::core::marker::PhantomData<T: 'static>);
+impl_reflect_trait_value!(::core::marker::PhantomData<T: Send + Sync + 'static>);
 
 impl_reflect_trait_value!(::std::sync::Arc<T: Reflect>);
 //impl_reflect_trait_value!(::std::sync::Arc<std::sync::Mutex<T: Reflect>>);
 //impl_reflect_trait_value!(::std::sync::RwLock<T: Reflect>);
 
-impl_reflect_trait_value!(::core::ptr::NonNull<T: Reflect>);
+//impl_reflect_trait_value!(::core::ptr::NonNull<T: Reflect>);
 
 impl<T: Clone + Reflect, const N: usize> Reflect for [T; N] {
     fn name(&self) -> String {

lyra-reflect/src/lib.rs

@@ -52,7 +52,7 @@ pub use registry::*;
 
 pub mod impls;
 
-pub trait Reflect: Any {
+pub trait Reflect: Any + Send + Sync {
     fn name(&self) -> String;
     fn type_id(&self) -> TypeId;
 

lyra-scripting/Cargo.toml

@@ -7,8 +7,8 @@ edition = "2021"
 
 [features]
 default = ["lua"]
-lua = ["dep:elua"]
-teal = ["lua", "elua/teal"]
+lua = ["dep:mlua"]
+#teal = ["lua", "mlua/teal"]
 
 [dependencies]
 lyra-scripting-derive = { path = "lyra-scripting-derive" }
@@ -22,11 +22,13 @@ tracing = "0.1.37"
 atomic_refcell = "0.1.13"
 
 # enabled with lua feature
-#mlua = { version = "0.9.2", features = ["lua54"], optional = true } # luajit maybe?
-elua = { path = "./elua", optional = true }
+# 
+#mlua = { version = "0.9.9", features = ["lua54", "send"], optional = true } # luajit maybe?
+mlua = { git = "https://github.com/mlua-rs/mlua", rev = "4dddf3c18d4590f7c92214fa592c3faca3d2c812", features = ["lua54", "send"], optional = true } # luajit maybe?
+#elua = { path = "./elua", optional = true }
 itertools = "0.12.0"
 paste = "1.0.14"
-
+parking_lot = "0.12.3"
 
 [dev-dependencies]
 tracing-subscriber = { version = "0.3.16", features = [ "tracing-log" ] }

lyra-scripting/lyra-scripting-derive/src/handle_macro.rs

@@ -145,24 +145,24 @@ pub(crate) fn lua_wrap_handle_impl(input: proc_macro::TokenStream) -> proc_macro
         
         let field_creator = match &g.wrapper_type {
             Some(wrap) => {
-                quote!(#wrap(data.#field).as_lua(lua))
+                quote!(#wrap(data.#field).into_lua(lua))
             },
             None => match &g.body {
                 Some(body) => {
                     quote!(#body)
                 },
                 None => {
-                    quote!(data.#field.clone().as_lua(lua))
+                    quote!(data.#field.clone().into_lua(lua))
                 }
             }
         };
 
         quote! {
-            builder.field_getter(stringify!($field), |lua, this| {
+            fields.add_field_method_get(stringify!($field), |lua, this| {
                 if let Some(data) = this.0.data_ref() {
                     #field_creator
                 } else {
-                    Ok(Value::Nil)
+                    Ok(mlua::Value::Nil)
                 }
             });
         }
@@ -186,16 +186,12 @@ pub(crate) fn lua_wrap_handle_impl(input: proc_macro::TokenStream) -> proc_macro
             }
         }
 
-        impl elua::Userdata for #wrapper_name {
-            fn name() -> String {
-                #ud_name.to_string()
-            }
-
-            fn build<'a>(builder: &mut elua::UserdataBuilder<'a, Self>) {
-                builder.field_getter("path", |_, this| Ok(this.path()));
-                builder.field_getter("version", |_, this| Ok(this.version()));
-                builder.field_getter("uuid", |_, this| Ok(this.uuid().to_string()));
-                builder.field_getter("state", |_, this| {
+        impl mlua::UserData for #wrapper_name {
+            fn add_fields<F: mlua::UserDataFields<Self>>(fields: &mut F) {
+                fields.add_field_method_get("path", |_, this| Ok(this.path()));
+                fields.add_field_method_get("version", |_, this| Ok(this.version()));
+                fields.add_field_method_get("uuid", |_, this| Ok(this.uuid().to_string()));
+                fields.add_field_method_get("state", |_, this| {
                     let name = if this.is_loaded() {
                         "ready"
                     } else if this.get_error().is_some() {
@@ -206,29 +202,31 @@ pub(crate) fn lua_wrap_handle_impl(input: proc_macro::TokenStream) -> proc_macro
                 });
 
                 #(#custom_getters)*
+            }
 
-                builder.method("is_watched", |_, this, ()| {
+            fn add_methods<M: mlua::UserDataMethods<Self>>(methods: &mut M) {
+                methods.add_method("is_watched", |_, this, ()| {
                     Ok(this.is_watched())
                 });
 
-                builder.method("is_loaded", |_, this, ()| {
+                methods.add_method("is_loaded", |_, this, ()| {
                     Ok(this.is_loaded())
                 });
 
-                builder.method("is_loaded", |_, this, ()| {
+                methods.add_method("is_loaded", |_, this, ()| {
                     Ok(this.is_loaded())
                 });
 
-                builder.method("wait_until_loaded", |_, this, ()| {
+                methods.add_method("wait_until_loaded", |_, this, ()| {
                     this.wait_recurse_dependencies_load();
 
                     Ok(())
                 });
 
-                builder.function(FN_NAME_INTERNAL_REFLECT_TYPE, |_, ()| {
+                methods.add_function(FN_NAME_INTERNAL_REFLECT_TYPE, |_, ()| {
                     Ok(ScriptBorrow::from_component::<ResHandle<#handle_name>>(None))
                 });
-                builder.method(FN_NAME_INTERNAL_REFLECT, |_, this, ()| {
+                methods.add_method(FN_NAME_INTERNAL_REFLECT, |_, this, ()| {
                     Ok(ScriptBorrow::from_component(Some(this.0.clone())))
                 });
 
@@ -236,12 +234,12 @@ pub(crate) fn lua_wrap_handle_impl(input: proc_macro::TokenStream) -> proc_macro
             }
         }
 
-        impl<'a> FromLua<'a> for #wrapper_name {
-            fn from_lua(_: &'a elua::State, val: elua::Value<'a>) -> elua::Result<Self> {
+        impl mlua::FromLua for #wrapper_name {
+            fn from_lua(val: mlua::Value, _: &mlua::Lua) -> mlua::Result<Self> {
                 let tyname = val.type_name();
                 let ud = val.as_userdata()
-                    .ok_or(elua::Error::type_mismatch(#ud_name, &tyname))?;
-                let ud = ud.as_ref::<#wrapper_name>()?;
+                    .ok_or(mlua::Error::external(crate::lua::Error::type_mismatch(#ud_name, &tyname)))?;
+                let ud = ud.borrow::<#wrapper_name>()?;
                 
                 Ok(ud.clone())
             }

lyra-scripting/lyra-scripting-derive/src/lua_macro.rs

@@ -156,13 +156,13 @@ impl MetaMethod {
 
             if Self::does_metamethod_have_arg(&self.name) {
                 quote! {
-                    builder.meta_method(elua::MetaMethod::#mt_ident, |_, this, (v,): (#wrapper_ident,)| {
+                    methods.add_meta_method(mlua::MetaMethod::#mt_ident, |_, this, (v,): (#wrapper_ident,)| {
                         #body
                     });
                 }
             } else {
                 quote! {
-                    builder.meta_method(elua::MetaMethod::#mt_ident, |_, this, ()| {
+                    methods.add_meta_method(mlua::MetaMethod::#mt_ident, |_, this, ()| {
                         #body
                     });
                 }
@@ -173,12 +173,12 @@ impl MetaMethod {
             let body = Self::get_body_for_arg(&self.name, first, quote!(v));
 
             quote! {
-                builder.meta_method(elua::MetaMethod::#mt_ident, |_, this, (v,): (#first,)| {
+                methods.add_meta_method(mlua::MetaMethod::#mt_ident, |_, this, (v,): (#first,)| {
                     #body
                 });
             }
         } else {
-            // an optional match arm that matches elua::Value:Number
+            // an optional match arm that matches mlua::Value:Number
             let number_arm = {
                 let num_ident = self.arg.iter().find(|i| {
                     let is = i.to_string();
@@ -195,7 +195,7 @@ impl MetaMethod {
                     let body = Self::get_body_for_arg(&self.name, num_ident, quote!(n as #num_ident));
 
                     quote! {
-                        elua::Value::Number(n) => {
+                        mlua::Value::Number(n) => {
                             #body
                         },
                     }
@@ -211,7 +211,7 @@ impl MetaMethod {
                     let body = Self::get_method_body(&self.name, quote!(other.0));
                     
                     quote! {
-                        if let Ok(other) = ud.as_ref::<#i>() {
+                        if let Ok(other) = ud.borrow::<#i>() {
                             #body
                         }
                     }
@@ -219,30 +219,30 @@ impl MetaMethod {
                 });
 
                 quote! {
-                    elua::Value::Userdata(ud) => {
+                    mlua::Value::UserData(ud) => {
                         #(#if_statements else)*
                         // this is the body of the else statement
                         {
                             // try to get the name of the userdata for the error message
-                            if let Ok(mt) = ud.get_metatable() {
-                                if let Ok(name) = mt.get::<_, String>("__name") {
-                                    return Err(elua::Error::BadArgument { 
-                                        func: Some(format!("{}.__{}", #wrapped_str, #mt_lua_name)),
-                                        arg_index: 2,
-                                        arg_name: Some("rhs".to_string()),
-                                        error: std::sync::Arc::new(elua::Error::Runtime(
+                            if let Ok(mt) = ud.metatable() {
+                                if let Ok(name) = mt.get::<String>("__name") {
+                                    return Err(mlua::Error::BadArgument { 
+                                        to: Some(format!("{}.__{}", #wrapped_str, #mt_lua_name)),
+                                        pos: 2,
+                                        name: Some("rhs".to_string()),
+                                        cause: std::sync::Arc::new(mlua::Error::runtime(
                                             format!("cannot multiply with unknown userdata named {}", name)
                                         ))
                                     });
                                 }
                             }
     
-                            Err(elua::Error::BadArgument { 
-                                func: Some(format!("{}.__{}", #wrapped_str, #mt_lua_name)),
-                                arg_index: 2,
-                                arg_name: Some("rhs".to_string()),
-                                error: std::sync::Arc::new(
-                                    elua::Error::runtime("cannot multiply with unknown userdata")
+                            Err(mlua::Error::BadArgument { 
+                                to: Some(format!("{}.__{}", #wrapped_str, #mt_lua_name)),
+                                pos: 2,
+                                name: Some("rhs".to_string()),
+                                cause: std::sync::Arc::new(
+                                    mlua::Error::runtime("cannot multiply with unknown userdata")
                                 )
                             })
                         }
@@ -251,16 +251,16 @@ impl MetaMethod {
             };
             
             quote! {
-                builder.meta_method(elua::MetaMethod::#mt_ident, |_, this, (v,): (elua::Value,)| {
+                methods.add_meta_method(mlua::MetaMethod::#mt_ident, |_, this, (v,): (mlua::Value,)| {
                     match v {
                         #number_arm
                         #userdata_arm
-                        _ => Err(elua::Error::BadArgument { 
-                            func: Some(format!("{}.__{}", #wrapped_str, #mt_lua_name)),
-                            arg_index: 2,
-                            arg_name: Some("rhs".to_string()),
-                            error: std::sync::Arc::new(
-                                elua::Error::Runtime(format!("cannot multiply with {}", v.type_name()))
+                        _ => Err(mlua::Error::BadArgument { 
+                            to: Some(format!("{}.__{}", #wrapped_str, #mt_lua_name)),
+                            pos: 2,
+                            name: Some("rhs".to_string()),
+                            cause: std::sync::Arc::new(
+                                mlua::Error::runtime(format!("cannot multiply with {}", v.type_name()))
                             )
                         })
                     }
@@ -410,10 +410,10 @@ pub fn wrap_lua_struct_impl(input: proc_macro::TokenStream) -> proc_macro::Token
     let field_get_set_pairs = input.auto_fields.iter().map(|i| {
         let is = i.to_string();
         quote! {
-            builder.field_getter(#is, |_, this| {
+            fields.add_field_method_get(#is, |_, this| {
                 Ok(this.#i)
             });
-            builder.field_setter(#is, |_, this, #i| {
+            fields.add_field_method_set(#is, |_, this, #i| {
                 this.#i = #i;
                 Ok(())
             });
@@ -431,7 +431,7 @@ pub fn wrap_lua_struct_impl(input: proc_macro::TokenStream) -> proc_macro::Token
         quote! {
             // arguments for function are not specified since they can be implied from the call
             // to new(...)
-            builder.function("new", |_, ( #(#arg_names_clone),* )| {
+            methods.add_function("new", |_, ( #(#arg_names_clone),* )| {
                 Ok(#wrapper_typename(#path::new( #(#arg_names),* )))
             });
         }
@@ -452,11 +452,11 @@ pub fn wrap_lua_struct_impl(input: proc_macro::TokenStream) -> proc_macro::Token
         quote!()
     } else {
         quote! {
-            builder.method(#FN_NAME_INTERNAL_REFLECT, |_, this, ()| {
+            methods.add_method(#FN_NAME_INTERNAL_REFLECT, |_, this, ()| {
                 Ok(crate::ScriptBorrow::from_component::<#path>(Some(this.0.clone())))
             });
     
-            builder.function(#FN_NAME_INTERNAL_REFLECT_TYPE, |_, ()| {
+            methods.add_function(#FN_NAME_INTERNAL_REFLECT_TYPE, |_, ()| {
                 Ok(crate::ScriptBorrow::from_component::<#path>(None))
             });
         }
@@ -480,22 +480,21 @@ pub fn wrap_lua_struct_impl(input: proc_macro::TokenStream) -> proc_macro::Token
             }
         }
 
-        impl<'lua> elua::FromLua<'lua> for #wrapper_typename {
-            fn from_lua(_lua: &'lua elua::State, value: elua::Value<'lua>) -> elua::Result<Self> {
+        impl mlua::FromLua for #wrapper_typename {
+            fn from_lua(value: mlua::Value, _: &mlua::Lua) -> mlua::Result<Self> {
                 match value {
-                    elua::Value::Userdata(ud) => Ok(ud.as_ref::<Self>()?.clone()),
+                    mlua::Value::UserData(ud) => Ok(ud.borrow::<Self>()?.clone()),
                     _ => panic!("Attempt to get {} from a {} value", stringify!(#wrapper_typename), value.type_name()),
                 }
             }
         }
 
-        impl elua::Userdata for #wrapper_typename {
-            fn name() -> String {
-                stringify!(#type_name).to_string()
+        impl mlua::UserData for #wrapper_typename {
+            fn add_fields<F: mlua::UserDataFields<Self>>(fields: &mut F) {
+                #(#field_get_set_pairs)*
             }
 
-            fn build<'a>(builder: &mut elua::UserdataBuilder<'a, Self>) {
-                #(#field_get_set_pairs)*
+            fn add_methods<M: mlua::UserDataMethods<Self>>(methods: &mut M) {
                 #lua_reflects
 
                 #new_func_tokens
@@ -509,20 +508,5 @@ pub fn wrap_lua_struct_impl(input: proc_macro::TokenStream) -> proc_macro::Token
                 std::any::TypeId::of::<#path>()
             }
         }
-
-        impl<'a> elua::FromLuaVec<'a> for #wrapper_typename {
-            fn from_lua_value_vec(state: &'a elua::State, mut values: elua::ValueVec<'a>) -> elua::Result<Self> {
-                use elua::FromLua;
-                
-                if let Some(val) = values.pop_front() {
-                    #wrapper_typename::from_lua(state, val)
-                } else {
-                    Err(elua::Error::IncorrectArgCount {
-                        arg_expected: 1,
-                        arg_count: values.len() as i32,
-                    })
-                }
-            }
-        }
     })
 }

lyra-scripting/lyra-scripting-derive/src/vec_wrapper.rs

@@ -49,8 +49,8 @@ impl VecWrapper {
 
         if axis_type_name.contains("b") {
             return quote! {
-                builder.field("FALSE", #wrapper_ident(#wrapped_path::FALSE));
-                builder.field("TRUE", #wrapper_ident(#wrapped_path::TRUE));
+                fields.add_field_method_get("FALSE", #wrapper_ident(#wrapped_path::FALSE));
+                fields.add_field_method_get("TRUE", #wrapper_ident(#wrapped_path::TRUE));
             };
         }
         
@@ -87,7 +87,7 @@ impl VecWrapper {
             let const_name = cnst.to_string();
 
             quote! {
-                builder.field(#const_name, #wrapper_ident(#wrapped_path::#cnst));
+                fields.add_field_method_get(#const_name, #wrapper_ident(#wrapped_path::#cnst));
             }
         });
 
@@ -112,27 +112,37 @@ impl VecWrapper {
 
             optional_methods.push(
                 quote! {
-                    builder.method("clamp_length",
+                    methods.add_method("clamp_length",
                             |_, this, (min, max): (#type_id, #type_id)| {
                         Ok(#wrapper_ident(this.clamp_length(min, max)))
                     });
 
-                    builder.method("abs_diff_eq",
+                    methods.add_method("abs_diff_eq",
                             |_, this, (rhs, max_abs_diff): (#wrapper_ident, #type_id)| {
                         Ok(this.abs_diff_eq(rhs.0, max_abs_diff))
                     });
 
-                    builder.method("ceil",
+                    methods.add_method("ceil",
                             |_, this, (): ()| {
                         Ok(#wrapper_ident(this.ceil()))
                     });
                 }
             );
 
-            if vec_size != 4 {
+            if vec_size == 2 {
+                // angle_between is deprecated for Vec2, must use angle_to instead.
                 optional_methods.push(
                     quote! {
-                        builder.method("angle_between",
+                        methods.add_method("angle_to",
+                                |_, this, (rhs,): (#wrapper_ident,)| {
+                            Ok(this.angle_to(rhs.0))
+                        });
+                    }
+                )
+            } else if vec_size != 4 {
+                optional_methods.push(
+                    quote! {
+                        methods.add_method("angle_between",
                                 |_, this, (rhs,): (#wrapper_ident,)| {
                             Ok(this.angle_between(rhs.0))
                         });
@@ -144,7 +154,7 @@ impl VecWrapper {
         if !axis_type_name.contains("u") {
             optional_methods.push(
                 quote! {
-                    builder.method("abs",
+                    methods.add_method("abs",
                             |_, this, (): ()| {
                         Ok(#wrapper_ident(this.abs()))
                     });
@@ -154,21 +164,18 @@ impl VecWrapper {
 
         let optional_methods_iter = optional_methods.iter();
         quote! {
-            
-
-            builder.method("clamp",
+            methods.add_method("clamp",
                     |_, this, (min, max): (#wrapper_ident, #wrapper_ident)| {
                 Ok(#wrapper_ident(this.clamp(min.0, max.0)))
             });
 
             // TODO: Not all Vecs have this
-            /* builder.method("clamp_length",
+            /* methods.add_method("clamp_length",
                     |_, this, (min, max): (f32, f32)| {
                 Ok(#wrapper_ident(this.clamp_length(min, max)))
             }); */
 
-
-            builder.method("to_array",
+            methods.add_method("to_array",
                     |_, this, (): ()| {
                 Ok(this.to_array())
             });

lyra-scripting/src/host.rs

@@ -8,16 +8,23 @@ use crate::ScriptWorldPtr;
 pub enum ScriptError {
     #[error("{0}")]
     #[cfg(feature = "lua")]
-    MluaError(elua::Error),
+    LuaError(crate::lua::Error),
 
     #[error("{0}")]
     Other(anyhow::Error),
 }
 
 #[cfg(feature = "lua")]
-impl From<elua::Error> for ScriptError {
-    fn from(value: elua::Error) -> Self {
-        ScriptError::MluaError(value)
+impl From<mlua::Error> for ScriptError {
+    fn from(value: mlua::Error) -> Self {
+        ScriptError::LuaError(crate::lua::Error::Mlua(value))
+    }
+}
+
+#[cfg(feature = "lua")]
+impl From<crate::lua::Error> for ScriptError {
+    fn from(value: crate::lua::Error) -> Self {
+        ScriptError::LuaError(value)
     }
 }
 

lyra-scripting/src/lib.rs

@@ -16,7 +16,7 @@ pub use host::*;
 pub mod script;
 pub use script::*;
 
-use lyra_game::game::Game;
+use lyra_game::game::App;
 
 // required for some proc macros :(
 #[allow(unused_imports)]
@@ -136,15 +136,15 @@ pub trait GameScriptExt {
         P: ScriptApiProvider<ScriptContext = T::ScriptContext> + 'static;
 }
 
-impl GameScriptExt for Game {
+impl GameScriptExt for App {
     fn add_script_api_provider<T, P>(&mut self, mut provider: P)
     where
         T: ScriptHost,
         P: ScriptApiProvider<ScriptContext = T::ScriptContext> + 'static
     {
-        let world = self.world_mut();
+        let world = &mut self.world;
         provider.prepare_world(world);
-        let mut providers = world.get_resource_mut::<ScriptApiProviders<T>>();
+        let mut providers = world.get_resource_mut::<ScriptApiProviders<T>>().unwrap();
         providers.add_provider(provider);
     }
 }

lyra-scripting/src/lua/dynamic_iter.rs

@@ -6,44 +6,41 @@ use lyra_reflect::TypeRegistry;
 #[cfg(feature = "lua")]
 use super::ReflectLuaProxy;
 
-use crate::ScriptWorldPtr;
-
 #[cfg(feature = "lua")]
-pub struct ReflectedItem<'a> {
+pub struct ReflectedItem {
     //pub proxy: &'a ReflectLuaProxy,
     pub comp_ptr: NonNull<u8>,
-    pub comp_val: elua::Value<'a>,
+    pub comp_val: mlua::Value,
 }
 
 #[cfg(feature = "lua")]
-pub struct ReflectedRow<'a> {
+pub struct ReflectedRow {
     pub entity: Entity,
-    pub row: Vec<ReflectedItem<'a>>,
+    pub row: Vec<ReflectedItem>,
 }
 
-pub struct ReflectedIterator {
-    pub world: ScriptWorldPtr,
+pub struct ReflectedIterator<'a> {
+    pub world: &'a lyra_ecs::World,
     pub dyn_view: DynamicViewStateIter,
     pub reflected_components: Option<NonNull<TypeRegistry>>
 }
 
-impl ReflectedIterator {
+impl<'a> ReflectedIterator<'a> {
     #[cfg(feature = "lua")]
-    pub fn next_lua<'a>(&mut self, lua: &'a elua::State) -> Option<ReflectedRow<'a>> {
-        use elua::AsLua;
+    pub fn next_lua(&mut self, lua: &mlua::Lua) -> Option<ReflectedRow> {
+        use mlua::IntoLua;
+
+        //let world = self.world.read();
+        let n = self.dyn_view.next(&self.world);
         
-        let world = self.world.as_ref();
-        let n = self.dyn_view.next(world);
-        
-        if let Some(row) = n {
+        if let Some((en, row)) = n {
             if self.reflected_components.is_none() {
-                let world = self.world.as_ref();
-                self.reflected_components = world.try_get_resource::<TypeRegistry>()
+                self.reflected_components = self.world.get_resource::<TypeRegistry>()
                     .map(|r| NonNull::from(r.deref()));
             }
 
             let mut dynamic_row = vec![];
-            for d in row.row.iter() {
+            for d in row.iter() {
                 let id = d.info.type_id().as_rust();
                 let reflected_components = 
                     unsafe { self.reflected_components.as_ref().unwrap().as_ref() };
@@ -54,7 +51,7 @@ impl ReflectedIterator {
                     // TODO: properly handle this error
                     .expect("Type does not have ReflectLuaProxy as a TypeData");
                 let value = (proxy.fn_as_lua)(lua, d.ptr.cast()).unwrap()
-                    .as_lua(lua).unwrap();
+                    .into_lua(lua).unwrap();
 
                 dynamic_row.push(ReflectedItem {
                     comp_ptr: d.ptr,
@@ -63,7 +60,7 @@ impl ReflectedIterator {
             }
 
             let row = ReflectedRow {
-                entity: row.entity,
+                entity: en,
                 row: dynamic_row
             };
 

lyra-scripting/src/lua/mod.rs

@@ -2,7 +2,7 @@ pub mod dynamic_iter;
 pub use dynamic_iter::*;
 
 pub mod world;
-use elua::FromLua;
+use mlua::ObjectLike;
 pub use world::*;
 
 pub mod script;
@@ -22,13 +22,48 @@ pub use system::*;
 
 use std::{any::TypeId, sync::Mutex};
 
-use lyra_ecs::{
-    Component, ComponentInfo, World
-};
+use lyra_ecs::World;
 use lyra_reflect::{Reflect, TypeRegistry};
 use crate::ScriptBorrow;
 
-pub type LuaContext = Mutex<elua::State>;
+pub type LuaContext = Mutex<mlua::Lua>;
+
+#[derive(Debug, thiserror::Error)]
+pub enum Error {
+    #[error("mismatched type, expected `{expected}`, got: `{got}`")]
+    TypeMismatch {
+        expected: String,
+        got: String,
+    },
+    #[error("received nil value from Lua")]
+    Nil,
+    #[error("{0}")]
+    Mlua(#[from] mlua::Error)
+}
+
+/* impl Into<mlua::Error> for Error {
+    fn into(self) -> mlua::Error {
+        match self {
+            Error::Mlua(error) => error,
+            _ => mlua::Error::external(self)
+        }
+    }
+}
+ */
+impl From<Error> for mlua::Error {
+    fn from(value: Error) -> Self {
+        match value {
+            Error::Mlua(error) => error,
+            _ => mlua::Error::external(value)
+        }
+    }
+}
+
+impl Error {
+    pub fn type_mismatch(expected: &str, got: &str) -> Self {
+        Self::TypeMismatch { expected: expected.into(), got: got.into() }
+    }
+}
 
 /// Name of a Lua function that is used to Reflect the Userdata, but without a value.
 /// 
@@ -47,7 +82,7 @@ pub const FN_NAME_INTERNAL_REFLECT: &str = "__lyra_internal_reflect";
 /// 
 /// This is used for types that can be converted into components. When implementing this function,
 /// you must return a [`ScriptBorrow`] that contains the component for this userdata.
-/// You can return [`elua::Value::Nil`] if for some reason the type could not be converted
+/// You can return [`mlua::Value::Nil`] if for some reason the type could not be converted
 /// into a component.
 /// 
 /// A good example of this is `LuaResHandle`. The resource handle is requested from the
@@ -78,32 +113,26 @@ pub trait RegisterLuaType {
     /// Register a type to Lua that **is not wrapped**.
     fn register_lua_type<'a, T>(&mut self)
     where
-        T: Reflect + LuaProxy + Clone + elua::FromLua<'a> + elua::Userdata;
+        T: Reflect + LuaProxy + Clone + mlua::FromLua + mlua::UserData;
 
     /// Registers a type to Lua that is wrapped another type.
     /// This would be used for something like `UserdataRef<T>`.
     fn register_lua_wrapper<'a, W>(&mut self)
     where
-        W: Reflect + LuaProxy + LuaWrapper + Clone + elua::FromLua<'a> + elua::Userdata;
+        W: Reflect + LuaProxy + LuaWrapper + Clone + mlua::FromLua + mlua::UserData;
 
     /// Registers a type to Lua that can be converted into and from Lua types.
     fn register_lua_convert<T>(&mut self)
     where
-        T: Clone + for<'a> elua::FromLua<'a> + for<'a> elua::AsLua<'a> + LuaWrapper + 'static;
-
-    /// Registers a type to Lua that implements [`elua::TableProxy`]
-    fn register_lua_table_proxy<'a, T, W>(&mut self)
-    where
-        T: elua::TableProxy + 'static,
-        W: Component;
+        T: Clone + mlua::FromLua + mlua::IntoLua + LuaWrapper + 'static;
 }
 
 impl RegisterLuaType for World {
     fn register_lua_type<'a, T>(&mut self)
     where
-        T: Reflect + LuaProxy + Clone + elua::FromLua<'a> + elua::Userdata
+        T: Reflect + LuaProxy + Clone + mlua::FromLua + mlua::UserData
     {
-        let mut registry = self.get_resource_mut::<TypeRegistry>();
+        let mut registry = self.get_resource_mut::<TypeRegistry>().unwrap();
 
         let type_id = TypeId::of::<T>();
 
@@ -113,72 +142,40 @@ impl RegisterLuaType for World {
 
     fn register_lua_wrapper<'a, W>(&mut self)
     where
-        W: Reflect + LuaProxy + LuaWrapper + Clone + elua::FromLua<'a> + elua::Userdata
+        W: Reflect + LuaProxy + LuaWrapper + Clone + mlua::FromLua + mlua::UserData
     {
-        let mut registry = self.get_resource_mut::<TypeRegistry>();
+        let mut registry = self.get_resource_mut::<TypeRegistry>().unwrap();
 
         let reg_type = registry.get_type_or_default(W::wrapped_type_id());
         reg_type.add_data(ReflectLuaProxy::from_lua_proxy::<W>());
-    }
+    }        
 
     fn register_lua_convert<T>(&mut self)
     where
-        T: Clone + for<'a> elua::FromLua<'a> + for<'a> elua::AsLua<'a> + LuaWrapper + 'static,
+        T: Clone + mlua::FromLua + mlua::IntoLua + LuaWrapper + 'static,
     {
-        let mut registry = self.get_resource_mut::<TypeRegistry>();
+        let mut registry = self.get_resource_mut::<TypeRegistry>().unwrap();
 
         let reg_type = registry.get_type_or_default(T::wrapped_type_id());
         reg_type.add_data(ReflectLuaProxy::from_as_and_from_lua::<T>());
     }
-
-    fn register_lua_table_proxy<'a, T, C>(&mut self)
-    where
-        T: elua::TableProxy + 'static,
-        C: Component
-    {
-        let mut registry = self.get_resource_mut::<TypeRegistry>();
-
-        let reg_type = registry.get_type_or_default(TypeId::of::<C>());
-        reg_type.add_data(ReflectLuaProxy::from_table_proxy::<T>());
-        drop(registry);
-
-        let mut lookup = self.get_resource_or_else::<LuaTableProxyLookup, _>(LuaTableProxyLookup::default);
-        lookup.typeid_from_name.insert(T::table_name(), TypeId::of::<C>());
-        
-        let info = ComponentInfo::new::<C>();
-        lookup.comp_info_from_name.insert(T::table_name(), info);
-    }
 }
 
-impl<'lua> elua::FromLua<'lua> for ScriptBorrow {
-    fn from_lua(_: &'lua elua::State, value: elua::Value<'lua>) -> elua::Result<Self> {
+impl mlua::FromLua for ScriptBorrow {
+    fn from_lua(value: mlua::Value, _: &mlua::Lua) -> mlua::Result<Self> {
         match value {
-            elua::Value::Userdata(ud) => Ok(ud.as_ref::<Self>()?.clone()),
+            mlua::Value::UserData(ud) => Ok(ud.borrow::<Self>()?.clone()),
             _ => unreachable!(),
         }
     }
 }
 
-impl<'lua> elua::FromLuaVec<'lua> for ScriptBorrow {
-    fn from_lua_value_vec(state: &'lua elua::State, mut values: elua::ValueVec<'lua>) -> elua::Result<Self> {
-        if let Some(v) = values.pop_front() {
-            ScriptBorrow::from_lua(state, v)
-        } else {
-            Err(elua::Error::Nil)
-        }
-    }
-}
-
-impl elua::Userdata for ScriptBorrow {
-    fn name() -> String {
-        "ScriptBorrow".to_string()
-    }
-
-    fn build<'a>(_: &mut elua::UserdataBuilder<'a, Self>) { }
+impl mlua::UserData for ScriptBorrow {
+    
 }
 
 /// Helper function used for reflecting userdata as a ScriptBorrow
-pub fn reflect_user_data(ud: &elua::AnyUserdata) -> ScriptBorrow {
-    ud.execute_method::<_, ScriptBorrow>(FN_NAME_INTERNAL_REFLECT, ())
+pub fn reflect_user_data(ud: &mlua::AnyUserData) -> ScriptBorrow {
+    ud.call_method::<ScriptBorrow>(FN_NAME_INTERNAL_REFLECT, ())
         .expect("Type does not implement internal reflect method properly")
 }

lyra-scripting/src/lua/providers/ecs.rs

@@ -17,7 +17,7 @@ impl ScriptApiProvider for LyraEcsApiProvider {
         world.register_lua_wrapper::<LuaSceneHandle>();
         world.register_lua_wrapper::<LuaActionHandler>();
 
-        let mut registry = world.get_resource_mut::<TypeRegistry>();
+        let mut registry = world.get_resource_mut::<TypeRegistry>().unwrap();
 
         let reg_type = registry.get_type_or_default(TypeId::of::<Gltf>());
         reg_type.add_data(ReflectLuaProxy::from_lua_proxy::<LuaGltfHandle>());
@@ -39,7 +39,7 @@ impl ScriptApiProvider for LyraEcsApiProvider {
     fn expose_api(&mut self, _: &ScriptData, ctx: &mut Self::ScriptContext) -> Result<(), crate::ScriptError> {
         let ctx = ctx.lock().unwrap();
 
-        let globals = ctx.globals()?;
+        let globals = ctx.globals();
         globals.set("World", ctx.create_proxy::<ScriptWorldPtr>()?)?;
         globals.set("DynamicBundle", ctx.create_proxy::<ScriptDynamicBundle>()?)?;
         globals.set("SceneComponent", ctx.create_proxy::<LuaSceneHandle>()?)?;
@@ -60,7 +60,7 @@ impl ScriptApiProvider for LyraEcsApiProvider {
     }
 }
 
-fn create_reflect_table<T: Reflect + ResourceObject + Default + 'static>(lua: &elua::State) -> elua::Result<elua::Table> {
+fn create_reflect_table<T: Reflect + ResourceObject + Default + 'static>(lua: &mlua::Lua) -> mlua::Result<mlua::Table> {
     let table = lua.create_table()?;
     table.set(FN_NAME_INTERNAL_REFLECT_TYPE, lua.create_function(|_, ()| {
         Ok(ScriptBorrow::from_resource::<T>(None))

lyra-scripting/src/lua/providers/math.rs

@@ -23,7 +23,7 @@ impl ScriptApiProvider for LyraMathApiProvider {
         /* let bytes = include_bytes!("../../../scripts/lua/math/transform.lua");
         ctx.load("lyra/math/transform.lua", bytes.as_slice())?.execute(())?; */
 
-        let globals = ctx.globals()?;
+        let globals = ctx.globals();
         globals.set("Vec3", ctx.create_proxy::<LuaVec3>()?)?;
         globals.set("Quat", ctx.create_proxy::<LuaQuat>()?)?;
         globals.set("Transform", ctx.create_proxy::<LuaTransform>()?)?;

lyra-scripting/src/lua/providers/util.rs

@@ -1,11 +1,12 @@
-use std::sync::{Mutex, Arc};
+use std::{ops::Deref, sync::{Arc, Mutex}};
 
-use tracing::{debug_span, debug};
+use mlua::{AnyUserData, ObjectLike};
+use tracing::{debug, debug_span};
 
 use crate::{ScriptApiProvider, ScriptData};
 
 /// This Api provider provides some nice utility functions.
-/// 
+///
 /// Functions:
 /// ```lua
 /// ---@param str (string) A format string.
@@ -17,99 +18,122 @@ use crate::{ScriptApiProvider, ScriptData};
 pub struct UtilityApiProvider;
 
 impl ScriptApiProvider for UtilityApiProvider {
-    type ScriptContext = Mutex<elua::State>;
+    type ScriptContext = Mutex<mlua::Lua>;
 
-    fn expose_api(&mut self, data: &ScriptData, ctx: &mut Self::ScriptContext) -> Result<(), crate::ScriptError> {
+    fn expose_api(
+        &mut self,
+        data: &ScriptData,
+        ctx: &mut Self::ScriptContext,
+    ) -> Result<(), crate::ScriptError> {
         let ctx = ctx.lock().unwrap();
 
-        //fn printf(lua: &elua::State, (mut text, formats): (String, elua::Variadic<elua::Value>)) -> elua::Result<()> {
-        let printf = |lua: &elua::State, (mut text, formats): (String, elua::Variadic<elua::Value>)| {
-            let mut formatted = String::new();
-            let mut arg_num = 0;
+        //fn printf(lua: &mlua::State, (mut text, formats): (String, mlua::Variadic<mlua::Value>)) -> mlua::Result<()> {
+        let printf =
+            |lua: &mlua::Lua, (mut text, formats): (String, mlua::Variadic<mlua::Value>)| {
+                let mut formatted = String::new();
+                let mut arg_num = 0;
 
-            while let Some(start) = text.find("{}") {
-                let val_str = match formats.get(arg_num) {
-                    Some(v) => match v {
-                        elua::Value::Nil => "nil".to_string(),
-                        elua::Value::Boolean(b) => b.to_string(),
-                        elua::Value::Number(n) => n.to_string(),
-                        elua::Value::String(s) => s.clone(),
-                        elua::Value::Table(_) => {
-                            return Err(elua::Error::runtime("unable to get string representation of Table"));
+                while let Some(start) = text.find("{}") {
+                    let val_str = match formats.get(arg_num) {
+                        Some(v) => match v {
+                            mlua::Value::Nil => "nil".to_string(),
+                            mlua::Value::Boolean(b) => b.to_string(),
+                            mlua::Value::Integer(n) => n.to_string(),
+                            mlua::Value::Number(n) => n.to_string(),
+                            mlua::Value::String(s) => s.to_string_lossy().to_string(),
+                            mlua::Value::Table(_) => {
+                                return Err(mlua::Error::runtime(
+                                    "unable to get string representation of Table",
+                                ));
+                            },
+                            mlua::Value::Function(_) => {
+                                return Err(mlua::Error::runtime(
+                                    "unable to get string representation of Function",
+                                ));
+                            },
+                            mlua::Value::Thread(_) => {
+                                return Err(mlua::Error::runtime(
+                                    "unable to get string representation of Thread",
+                                ));
+                            },
+                            mlua::Value::UserData(ud) => {
+                                if let Ok(tos) =
+                                    ud.get::<mlua::Function>(mlua::MetaMethod::ToString.name())
+                                {
+                                    tos.call::<String>(())?
+                                } else {
+                                    return Err(mlua::Error::runtime(
+                                        "UserData does not implement MetaMethod '__tostring'",
+                                    ));
+                                }
+                            },
+                            mlua::Value::LightUserData(_) => {
+                                return Err(mlua::Error::runtime(
+                                    "unable to get string representation of LightUserData",
+                                ));
+                            },
+                            mlua::Value::Error(error) => {
+                                return Err(error.deref().clone());
+                            },
                         },
-                        elua::Value::Function(_) => {
-                            return Err(elua::Error::runtime("unable to get string representation of Function"));
-                        },
-                        elua::Value::Thread(_) => {
-                            return Err(elua::Error::runtime("unable to get string representation of Thread"));
-                        },
-                        elua::Value::Userdata(ud) => {
-                            if let Ok(tos) = ud.get::<_, elua::Function>(elua::MetaMethod::ToString) {
-                                tos.exec::<_, String>(())?
-                            } else {
-                                return Err(elua::Error::runtime("UserData does not implement MetaMethod '__tostring'"));
+                        None => {
+                            let got_args = arg_num; // - 1;
+
+                            // continue searching for {} to get the number of format spots for the error message.
+                            while let Some(start) = text.find("{}") {
+                                text = text[start + 2..].to_string();
+                                arg_num += 1;
                             }
-                        },
-                        elua::Value::None => "None".to_string(),
-                        elua::Value::Multi(_) => {
-                            return Err(elua::Error::runtime("unable to get string representation of ValueVec"));
-                        },
-                    },
-                    None => {
-                        let got_args = arg_num;// - 1;
 
-                        // continue searching for {} to get the number of format spots for the error message.
-                        while let Some(start) = text.find("{}") {
-                            text = text[start + 2..].to_string();
-                            arg_num += 1;
+                            return Err(mlua::Error::BadArgument {
+                                to: Some("printf".into()),
+                                pos: 2,
+                                name: Some("fmt...".into()),
+                                cause: Arc::new(mlua::Error::runtime(format!(
+                                    "not enough args \
+                                    given for the amount of format areas in the string. Expected {}, \
+                                    got {}.",
+                                    arg_num, got_args
+                                ))),
+                            });
                         }
+                    };
 
-                        return Err(elua::Error::BadArgument {
-                            func: Some("printf".to_string()),
-                            arg_index: 2,
-                            arg_name: Some("fmt...".to_string()),
-                            error: Arc::new(elua::Error::Runtime(format!(
-                                "not enough args \
-                                given for the amount of format areas in the string. Expected {}, \
-                                got {}.", arg_num, got_args
-                            )))
-                        })
-                    },
-                };
+                    formatted = format!("{}{}{}", formatted, &text[0..start], val_str);
 
-                formatted = format!("{}{}{}", formatted, &text[0..start], val_str);
+                    text = text[start + 2..].to_string();
 
-                text = text[start + 2..].to_string();
+                    arg_num += 1;
+                }
 
-                arg_num += 1;
-            }
+                if arg_num < formats.len() {
+                    return Err(mlua::Error::BadArgument {
+                        to: Some("printf".into()),
+                        pos: 2,
+                        name: Some("fmt...".into()),
+                        cause: Arc::new(mlua::Error::runtime(format!(
+                            "got more args \
+                            than format areas in the string. Expected {}, got {}.",
+                            formats.len(),
+                            arg_num
+                        ))),
+                    });
+                }
 
-            if arg_num < formats.len() {
-                return Err(elua::Error::BadArgument {
-                    func: Some("printf".to_string()),
-                    arg_index: 2,
-                    arg_name: Some("fmt...".to_string()),
-                    error: Arc::new(elua::Error::Runtime(format!(
-                        "got more args \
-                        than format areas in the string. Expected {}, got {}.", formats.len(), arg_num
-                    )))
-                })
-            }
-            
-            formatted = format!("{}{}", formatted, text);
+                formatted = format!("{}{}", formatted, text);
 
-            lua.globals()?
-                .get::<_, elua::Function>("print")?
-                .exec::<_, ()>(formatted)?;
+                lua.globals()
+                    .get::<mlua::Function>("print")?
+                    .call::<()>(formatted)?;
 
-            Ok(())
-        };
-        
-        let script_name_reg = ctx.registry_insert(data.name.clone())?;
+                Ok(())
+            };
+
+        let script_name_reg = ctx.create_registry_value(data.name.clone())?;
 
         let printf_func = ctx.create_function(printf)?;
         let print_func = ctx.create_function(move |lua, text: String| {
-            let name = lua.registry_get::<String>(script_name_reg)?;
+            let name = lua.registry_value::<String>(&script_name_reg)?;
             let _span = debug_span!("lua", script = &name).entered();
 
             debug!(target: "lyra_scripting::lua", "{}", text);
@@ -117,18 +141,42 @@ impl ScriptApiProvider for UtilityApiProvider {
             Ok(())
         })?;
 
-        let globals = ctx.globals()?;
+        // a custom implementation of `getmetatable` is required since mlua protects __metatable,
+        // making it impossible to get the metatable of userdata.
+        let getmetatable_func = ctx.create_function(|lua, ud: AnyUserData| {
+            // the userdata is left on the stack from `lua_getmetatable`, so that needs to be
+            // included in the returns
+            let (_ud, table): (mlua::AnyUserData, mlua::Table) = unsafe {
+                lua.exec_raw(ud, |state| {
+                    mlua::ffi::lua_getmetatable(state, -1);
+                })
+            }?;
+            
+            Ok(table)
+        })?;
+
+        let globals = ctx.globals();
         globals.set("printf", printf_func)?;
         globals.set("print", print_func)?;
-        
+        globals.set("getmetatable2", getmetatable_func)?;
+
         Ok(())
     }
 
-    fn setup_script(&mut self, _data: &ScriptData, _ctx: &mut Self::ScriptContext) -> Result<(), crate::ScriptError> {
+    fn setup_script(
+        &mut self,
+        _data: &ScriptData,
+        _ctx: &mut Self::ScriptContext,
+    ) -> Result<(), crate::ScriptError> {
         Ok(())
     }
 
-    fn update_script_environment(&mut self, _world: crate::ScriptWorldPtr, _data: &ScriptData, _ctx: &mut Self::ScriptContext) -> Result<(), crate::ScriptError> {
+    fn update_script_environment(
+        &mut self,
+        _world: crate::ScriptWorldPtr,
+        _data: &ScriptData,
+        _ctx: &mut Self::ScriptContext,
+    ) -> Result<(), crate::ScriptError> {
         Ok(())
     }
-}
+}

lyra-scripting/src/lua/proxy.rs

@@ -1,12 +1,12 @@
 use std::{any::TypeId, collections::HashMap, ptr::NonNull};
 
-use elua::{FromLua, TableProxy, AsLua};
+use mlua::{ObjectLike, IntoLua};
 use lyra_ecs::{ComponentInfo, DynamicBundle};
 use lyra_reflect::Reflect;
 
 use crate::{ScriptBorrow, ScriptDynamicBundle};
 
-use super::FN_NAME_INTERNAL_REFLECT;
+use super::{Error, FN_NAME_INTERNAL_REFLECT};
 
 pub trait LuaWrapper {
     /// The type id of the wrapped type.
@@ -15,40 +15,39 @@ pub trait LuaWrapper {
 
 /// A trait that used to convert something into lua, or to set something to a value from lua.
 pub trait LuaProxy {
-    fn as_lua_value<'lua>(
-        lua: &'lua elua::State,
+    fn as_lua_value(
+        lua: &mlua::Lua,
         this: &dyn Reflect,
-    ) -> elua::Result<elua::Value<'lua>>;
+    ) -> mlua::Result<mlua::Value>;
 
     fn apply(
-        lua: &elua::State,
+        lua: &mlua::Lua,
         this: &mut dyn Reflect,
-        value: &elua::Value,
-    ) -> elua::Result<()>;
+        value: &mlua::Value,
+    ) -> mlua::Result<()>;
 }
 
 impl<'a, T> LuaProxy for T
 where
-    T: Reflect + Clone + elua::FromLua<'a> + elua::Userdata
+    T: Reflect + Clone + mlua::FromLua + mlua::UserData
 {
-    fn as_lua_value<'lua>(
-        lua: &'lua elua::State,
+    fn as_lua_value(
+        lua: &mlua::Lua,
         this: &dyn Reflect,
-    ) -> elua::Result<elua::Value<'lua>> {
+    ) -> mlua::Result<mlua::Value> {
         let this = this.as_any().downcast_ref::<T>().unwrap();
-        lua.create_userdata(this.clone())
-            .and_then(|ud| ud.as_lua(lua))
+        this.clone().into_lua(lua)
     }
 
     fn apply(
-        _: &elua::State,
+        _: &mlua::Lua,
         this: &mut dyn Reflect,
-        apply: &elua::Value,
-    ) -> elua::Result<()> {
+        apply: &mlua::Value,
+    ) -> mlua::Result<()> {
         let this = this.as_any_mut().downcast_mut::<T>().unwrap();
         let apply = apply.as_userdata()
             .expect("Somehow a non-userdata Lua Value was provided to a LuaProxy")
-            .as_ref::<T>()?;
+            .borrow::<T>()?;
 
         *this = apply.clone();
 
@@ -67,12 +66,12 @@ pub struct LuaTableProxyLookup {
 #[derive(Clone)]
 pub struct ReflectLuaProxy {
     pub fn_as_lua:
-        for<'a> fn(lua: &'a elua::State, this_ptr: NonNull<()>) -> elua::Result<elua::Value<'a>>,
+        for<'a> fn(lua: &'a mlua::Lua, this_ptr: NonNull<()>) -> mlua::Result<mlua::Value>,
     pub fn_apply: for<'a> fn(
-        lua: &'a elua::State,
+        lua: &'a mlua::Lua,
         this_ptr: NonNull<()>,
-        value: &'a elua::Value<'a>,
-    ) -> elua::Result<()>,
+        value: &'a mlua::Value,
+    ) -> mlua::Result<()>,
 }
 
 impl ReflectLuaProxy {
@@ -82,7 +81,7 @@ impl ReflectLuaProxy {
         T: Reflect + LuaProxy
     {
         Self {
-            fn_as_lua: |lua, this| -> elua::Result<elua::Value> {
+            fn_as_lua: |lua, this| -> mlua::Result<mlua::Value> {
                 let this = unsafe { this.cast::<T>().as_ref() };
                 <T as LuaProxy>::as_lua_value(lua, this)
             },
@@ -93,42 +92,19 @@ impl ReflectLuaProxy {
         }
     }
 
-    pub fn from_table_proxy<T>() -> Self
-    where
-        T: TableProxy
-    {
-        Self {
-            fn_as_lua: |lua, this| -> elua::Result<elua::Value> {
-                let this = unsafe { this.cast::<T>().as_ref() };
-                this.as_table(lua)
-                    .and_then(|t| t.as_lua(lua))
-            },
-            fn_apply: |lua, ptr, value| {
-                let this = unsafe { ptr.cast::<T>().as_mut() };
-                let table = value.as_table()
-                    .expect("Somehow a non-Table Lua Value was provided to a TableProxy");
-                let new_val = T::from_table(lua, table.clone())?;
-
-                *this = new_val;
-                
-                Ok(())
-            },
-        }
-    }
-
     /// Create from a type that implements FromLua and AsLua
     pub fn from_as_and_from_lua<T>() -> Self
     where
-        T: for<'a> elua::FromLua<'a> + for<'a> elua::AsLua<'a> + Clone
+        T: mlua::FromLua + mlua::IntoLua + Clone
     {
         Self {
-            fn_as_lua: |lua, this| -> elua::Result<elua::Value> {
+            fn_as_lua: |lua, this| -> mlua::Result<mlua::Value> {
                 let this = unsafe { this.cast::<T>().as_ref() };
-                this.clone().as_lua(lua)
+                this.clone().into_lua(lua)
             },
             fn_apply: |lua, ptr, value| {
                 let this = unsafe { ptr.cast::<T>().as_mut() };
-                let new_val = T::from_lua(lua, value.clone())?;
+                let new_val = T::from_lua(value.clone(), lua)?;
 
                 *this = new_val;
                 
@@ -138,42 +114,27 @@ impl ReflectLuaProxy {
     }
 }
 
-impl<'lua> elua::FromLua<'lua> for ScriptDynamicBundle {
-    fn from_lua(_: &'lua elua::State, val: elua::Value<'lua>) -> elua::Result<Self> {
+impl mlua::FromLua for ScriptDynamicBundle {
+    fn from_lua(val: mlua::Value, _: &mlua::Lua) -> mlua::Result<Self> {
         match val {
-            elua::Value::Userdata(ud) => Ok(ud.as_ref::<Self>()?.clone()),
-            elua::Value::Nil => Err(elua::Error::Nil),
+            mlua::Value::UserData(ud) => Ok(ud.borrow::<Self>()?.clone()),
+            mlua::Value::Nil => Err(Error::Nil.into()),
             _ => unreachable!(),
         }
     }
 }
 
-impl<'lua> elua::FromLuaVec<'lua> for ScriptDynamicBundle {
-    fn from_lua_value_vec(state: &'lua elua::State, mut values: elua::ValueVec<'lua>) -> elua::Result<Self> {
-        if let Some(v) = values.pop_front() {
-            Ok(ScriptDynamicBundle::from_lua(state, v)?)
-        } else {
-            Err(elua::Error::Nil)
-        }
-    }
-}
+impl mlua::UserData for ScriptDynamicBundle {
+    fn add_methods<M: mlua::UserDataMethods<Self>>(methods: &mut M) {
+        methods.add_function("new", |_, ()| Ok(ScriptDynamicBundle(DynamicBundle::new())));
+        methods.add_method_mut("push", |_, this, comp: mlua::AnyUserData| {
+            let script_brw = comp.call_method::<ScriptBorrow>(FN_NAME_INTERNAL_REFLECT, ())?;
+            let reflect = script_brw.reflect_branch.as_component_unchecked();
 
-impl elua::Userdata for ScriptDynamicBundle {
-    fn name() -> String {
-        "Bundle".to_string()
-    }
+            let refl_data = script_brw.data.unwrap();
+            reflect.bundle_insert(&mut this.0, refl_data);
 
-    fn build<'a>(builder: &mut elua::UserdataBuilder<'a, Self>) {
-        builder
-            .function("new", |_, ()| Ok(ScriptDynamicBundle(DynamicBundle::new())))
-            .method_mut("push", |_, this, comp: elua::AnyUserdata| {
-                let script_brw = comp.execute_method::<_, ScriptBorrow>(FN_NAME_INTERNAL_REFLECT, ())?;
-                let reflect = script_brw.reflect_branch.as_component_unchecked();
-
-                let refl_data = script_brw.data.unwrap();
-                reflect.bundle_insert(&mut this.0, refl_data);
-
-                Ok(())
-            });
+            Ok(())
+        });
     }
 }

lyra-scripting/src/lua/script.rs

@@ -1,31 +1,32 @@
 use std::sync::Mutex;
 
-use elua::{AsLua, StdLibraries};
+use mlua::{IntoLua, StdLib};
 
 use crate::{ScriptHost, ScriptError, ScriptWorldPtr, ScriptEntity};
 
 #[derive(Default)]
 pub struct LuaHost;
 
-fn try_call_lua_function(lua: &elua::State, fn_name: &str) -> Result<(), ScriptError> {
-    let globals = lua.globals()?;
+fn try_call_lua_function(lua: &mlua::Lua, fn_name: &str) -> Result<(), ScriptError> {
+    let globals = lua.globals();
 
-    if globals.has_key(fn_name)? {
-        let lua_fn = globals.get::<_, elua::Function>(fn_name)?;
-        lua_fn.exec(())
-            .map_err(ScriptError::MluaError)?;
+    if globals.contains_key(fn_name)? {
+        let lua_fn = globals.get::<mlua::Function>(fn_name)?;
+        lua_fn.call::<()>(())
+            .map_err(ScriptError::from)?;
     }
 
     Ok(())
 }
 
 impl ScriptHost for LuaHost {
-    type ScriptContext = Mutex<elua::State>;
+    type ScriptContext = Mutex<mlua::Lua>;
 
     fn load_script(&mut self, script: &[u8], script_data: &crate::ScriptData, providers: &mut crate::ScriptApiProviders<Self>) -> Result<Self::ScriptContext, crate::ScriptError> {
         let mut ctx = Mutex::new({
-            let s = elua::State::new();
-            s.expose_libraries(StdLibraries::all());
+            // unsafe is required to allow the debug module
+            let s = unsafe { mlua::Lua::unsafe_new() };
+            s.load_std_libs(StdLib::ALL)?;
             s
         });
         
@@ -35,9 +36,9 @@ impl ScriptHost for LuaHost {
         }
 
         let lua = ctx.lock().unwrap();
-        lua.load(&script_data.name, script)?
-            .execute(())
-            .map_err(|e| ScriptError::MluaError(e))?;
+        lua.load(script)
+            .exec()
+            .map_err(|e| ScriptError::LuaError(super::Error::Mlua(e)))?;
         drop(lua);
 
         Ok(ctx)
@@ -65,9 +66,9 @@ impl ScriptHost for LuaHost {
 
         let ctx = ctx.lock().expect("Failure to get Lua ScriptContext");
         
-        let globals = ctx.globals()?;
-        globals.set("world", world.as_lua(&ctx)?)?;
-        globals.set("entity", ScriptEntity(script_data.entity).as_lua(&ctx)?)?;
+        let globals = ctx.globals();
+        globals.set("world", world.into_lua(&ctx)?)?;
+        globals.set("entity", ScriptEntity(script_data.entity).into_lua(&ctx)?)?;
         
         try_call_lua_function(&ctx, function_name)?;
 

lyra-scripting/src/lua/system.rs

@@ -5,7 +5,7 @@ use lyra_reflect::TypeRegistry;
 use lyra_resource::ResourceManager;
 use tracing::{debug, debug_span, error, trace};
 
-use crate::{GameScriptExt, ScriptApiProviders, ScriptContexts, ScriptData, ScriptError, ScriptHost, ScriptList, ScriptWorldPtr};
+use crate::{GameScriptExt, ScriptApiProviders, ScriptContexts, ScriptData, ScriptError, ScriptHost, ScriptList, ScriptWorldPtrGuard};
 
 use super::{providers::{LyraEcsApiProvider, LyraMathApiProvider, UtilityApiProvider}, LuaContext, LuaHost, LuaLoader, LuaScript};
 
@@ -40,7 +40,8 @@ pub fn lua_scripts_create_contexts(
                     trace!("Finished setting up script");
 
                     // call on_init, handle the error
-                    let world_ptr = ScriptWorldPtr::from_ref(&world);
+                    let world_guard = unsafe { ScriptWorldPtrGuard::new(world) };
+                    let world_ptr = (*world_guard).clone();
                     match host.call_script(
                         world_ptr,
                         &script_data,
@@ -50,7 +51,7 @@ pub fn lua_scripts_create_contexts(
                     ) {
                         Ok(()) => {}
                         Err(e) => match e {
-                            ScriptError::MluaError(m) => {
+                            ScriptError::LuaError(m) => {
                                 error!("Script '{}' ran into an error: {}", script.name(), m);
                             }
                             ScriptError::Other(_) => return Err(e.into()),
@@ -114,10 +115,11 @@ pub fn lua_scripts_reload_system(
 }
 
 fn lua_call_script_function(world: &mut World, stage_name: &str) -> anyhow::Result<()> {
-    let world_ptr = ScriptWorldPtr::from_ref(&world);
-    let mut host = world.get_resource_mut::<LuaHost>();
-    let mut contexts = world.get_resource_mut::<ScriptContexts<LuaContext>>();
-    let mut providers = world.get_resource_mut::<ScriptApiProviders<LuaHost>>();
+    let world_guard = unsafe { ScriptWorldPtrGuard::new(world) };
+    let world_ptr = (*world_guard).clone();
+    let mut host = world.get_resource_mut::<LuaHost>().unwrap();
+    let mut contexts = world.get_resource_mut::<ScriptContexts<LuaContext>>().unwrap();
+    let mut providers = world.get_resource_mut::<ScriptApiProviders<LuaHost>>().unwrap();
 
     for (en, scripts) in world.view_iter::<(Entities, &ScriptList<LuaScript>)>() {
         for script in scripts.iter() {
@@ -143,7 +145,7 @@ fn lua_call_script_function(world: &mut World, stage_name: &str) -> anyhow::Resu
                 ) {
                     Ok(()) => {}
                     Err(e) => match e {
-                        ScriptError::MluaError(m) => {
+                        ScriptError::LuaError(m) => {
                             error!("Script '{}' ran into an error: {}", script.name(), m);
                         }
                         ScriptError::Other(_) => return Err(e.into()),
@@ -190,8 +192,8 @@ pub fn lua_script_last_stage_system(world: &mut World) -> anyhow::Result<()> {
 pub struct LuaScriptingPlugin;
 
 impl Plugin for LuaScriptingPlugin {
-    fn setup(&mut self, game: &mut lyra_game::game::Game) {
-        let world = game.world_mut();
+    fn setup(&mut self, app: &mut lyra_game::game::App) {
+        let world = &mut app.world;
 
         world.add_resource_default::<TypeRegistry>();
 
@@ -200,16 +202,16 @@ impl Plugin for LuaScriptingPlugin {
         world.add_resource_default::<ScriptContexts<LuaContext>>();
 
         let loader = world
-            .try_get_resource_mut::<ResourceManager>()
+            .get_resource_mut::<ResourceManager>()
             .expect("Add 'ResourceManager' to the world before trying to add this plugin");
         loader.register_loader::<LuaLoader>();
         drop(loader);
 
-        game.add_script_api_provider::<LuaHost, _>(UtilityApiProvider);
-        game.add_script_api_provider::<LuaHost, _>(LyraEcsApiProvider);
-        game.add_script_api_provider::<LuaHost, _>(LyraMathApiProvider);
+        app.add_script_api_provider::<LuaHost, _>(UtilityApiProvider);
+        app.add_script_api_provider::<LuaHost, _>(LyraEcsApiProvider);
+        app.add_script_api_provider::<LuaHost, _>(LyraMathApiProvider);
 
-        game.add_system_to_stage(
+        app.add_system_to_stage(
             GameStages::First,
             "lua_create_contexts",
             lua_scripts_create_contexts,

lyra-scripting/src/lua/world.rs

@@ -1,32 +1,31 @@
-use std::{ptr::NonNull, sync::Arc};
+use std::{ops::DerefMut, ptr::NonNull, sync::Arc};
 
 use crate::{ScriptBorrow, ScriptEntity, ScriptWorldPtr};
-use elua::AsLua;
-use lyra_ecs::{query::dynamic::{DynamicViewState, DynamicViewStateIter, QueryDynamicType}, CommandQueue, Commands, DynamicBundle, World};
+use lyra_ecs::{
+    query::dynamic::{DynamicViewState, DynamicViewStateIter, QueryDynamicType},
+    CommandQueue, Commands, DynamicBundle, World,
+};
 use lyra_reflect::{ReflectWorldExt, RegisteredType, TypeRegistry};
 use lyra_resource::ResourceManager;
+use mlua::{IntoLua, ObjectLike};
 
 use super::{
-    reflect_user_data, wrappers::LuaResHandleToComponent, LuaTableProxyLookup, ReflectLuaProxy, ReflectedIterator, FN_NAME_INTERNAL_AS_COMPONENT, FN_NAME_INTERNAL_REFLECT, FN_NAME_INTERNAL_REFLECT_TYPE
+    reflect_user_data, wrappers::LuaResHandleToComponent, Error, LuaTableProxyLookup, ReflectLuaProxy, ReflectedIterator, FN_NAME_INTERNAL_AS_COMPONENT, FN_NAME_INTERNAL_REFLECT, FN_NAME_INTERNAL_REFLECT_TYPE
 };
 
-impl<'lua> elua::FromLua<'lua> for ScriptEntity {
-    fn from_lua(_: &'lua elua::State, value: elua::Value<'lua>) -> elua::Result<Self> {
+impl mlua::FromLua for ScriptEntity {
+    fn from_lua(value: mlua::Value, _: &mlua::Lua) -> mlua::Result<Self> {
         match value {
-            elua::Value::Userdata(ud) => Ok(ud.as_ref::<Self>()?.clone()),
-            elua::Value::Nil => Err(elua::Error::type_mismatch("ScriptEntity", "Nil")),
+            mlua::Value::UserData(ud) => Ok(ud.borrow::<Self>()?.clone()),
+            mlua::Value::Nil => Err(mlua::Error::external(Error::type_mismatch("ScriptEntity", "Nil"))),
             _ => panic!(),
         }
     }
 }
 
-impl elua::Userdata for ScriptEntity {
-    fn name() -> String {
-        "Entity".to_string()
-    }
-
-    fn build<'a>(builder: &mut elua::userdata::UserdataBuilder<'a, Self>) {
-        builder.meta_method(elua::MetaMethod::ToString, |_, this, ()| {
+impl mlua::UserData for ScriptEntity {
+    fn add_methods<M: mlua::UserDataMethods<Self>>(methods: &mut M) {
+        methods.add_meta_method(mlua::MetaMethod::ToString, |_, this, ()| {
             Ok(format!("{:?}", this.0))
         });
     }
@@ -38,279 +37,278 @@ pub enum WorldError {
     LuaInvalidUsage(String),
 }
 
-impl<'a> elua::FromLua<'a> for ScriptWorldPtr {
-    fn from_lua(_: &'a elua::State, val: elua::Value<'a>) -> elua::Result<Self> {
+impl mlua::FromLua for ScriptWorldPtr {
+    fn from_lua(val: mlua::Value, _: &mlua::Lua) -> mlua::Result<Self> {
         match val {
-            elua::Value::Userdata(ud) => Ok(ud.as_ref::<Self>()?.clone()),
-            elua::Value::Nil => Err(elua::Error::type_mismatch("ScriptWorldPtr", "Nil")),
+            mlua::Value::UserData(ud) => Ok(ud.borrow::<Self>()?.clone()),
+            mlua::Value::Nil => Err(mlua::Error::external(Error::type_mismatch("ScriptWorldPtr", "Nil"))),
             _ => panic!(),
         }
     }
 }
 
-impl elua::Userdata for ScriptWorldPtr {
-    fn name() -> String {
-        "World".to_string()
-    }
+impl mlua::UserData for ScriptWorldPtr {
+    fn add_methods<M: mlua::UserDataMethods<Self>>(methods: &mut M) {
+        methods.add_method_mut("spawn", |_, this, vals: mlua::MultiValue| {
+            let mut world = this.write();
 
-    fn build<'a>(builder: &mut elua::UserdataBuilder<'a, Self>) {
-        builder
-            .method_mut("spawn", |_, this, vals: elua::ValueVec| {
-                let world = this.as_mut();
+            let mut bundle = DynamicBundle::new();
 
-                let mut bundle = DynamicBundle::new();
+            //while let Some(val) = vals.pop_front() {
+            for (i, val) in vals.into_iter().enumerate() {
+                let ud = val.as_userdata().ok_or(mlua::Error::BadArgument {
+                    to: Some("World:spawn".into()),
+                    pos: 2 + i, // i starts at 0
+                    name: Some("components...".into()),
+                    cause: Arc::new(mlua::Error::runtime("provided component is not userdata")),
+                })?;
 
-                //while let Some(val) = vals.pop_front() {
-                for (i, val) in vals.into_iter().enumerate() {
-                    let ud = val.as_userdata().ok_or(
-                        elua::Error::bad_arg(
-                            Some("World:spawn"),
-                            2 + i as i32, // i starts at 0
-                            Some("components..."),
-                            Arc::new(elua::Error::runtime("provided component is not userdata")),
-                        ))?;
-                    
-                    let comp_borrow = {
-                        if let Ok(as_comp) = ud.get::<_, elua::Function>(FN_NAME_INTERNAL_AS_COMPONENT) {
-                            let ud = match as_comp.exec(ud.clone())? {
-                                elua::Value::Userdata(ud) => ud,
-                                elua::Value::Nil => ud.clone(),
-                                _ => todo!(),
-                            };
+                let comp_borrow = {
+                    if let Ok(as_comp) = ud.get::<mlua::Function>(FN_NAME_INTERNAL_AS_COMPONENT)
+                    {
+                        let ud = match as_comp.call(ud.clone())? {
+                            mlua::Value::UserData(ud) => ud,
+                            mlua::Value::Nil => ud.clone(),
+                            _ => todo!(),
+                        };
 
-                            ud.execute_method::<_, ScriptBorrow>(FN_NAME_INTERNAL_REFLECT, ())?
-                        } else {
-                            ud.execute_method::<_, ScriptBorrow>(FN_NAME_INTERNAL_REFLECT, ())?
-                        }
-                    };
+                        ud.call_method::<ScriptBorrow>(FN_NAME_INTERNAL_REFLECT, ())?
+                    } else {
+                        ud.call_method::<ScriptBorrow>(FN_NAME_INTERNAL_REFLECT, ())?
+                    }
+                };
 
-                    let reflect = comp_borrow.reflect_branch.as_component_unchecked();
-                    let refl_data = comp_borrow.data.unwrap();
-                    reflect.bundle_insert(&mut bundle, refl_data);
+                let reflect = comp_borrow.reflect_branch.as_component_unchecked();
+                let refl_data = comp_borrow.data.unwrap();
+                reflect.bundle_insert(&mut bundle, refl_data);
+            }
+
+            // defer the entity spawn
+            // SAFETY: Commands borrows Entities from World, the resource borrows from the world resources,
+            // They are borrowing different parts of World.
+            let world_ptr: *mut World = world.deref_mut();
+            let mut commands_queue = world.get_resource_mut::<CommandQueue>().unwrap();
+            let mut commands = Commands::new(&mut commands_queue, unsafe { &mut *world_ptr });
+            let entity = commands.spawn(bundle);
+
+            Ok(ScriptEntity(entity))
+        });
+        methods.add_method_mut(
+            "view",
+            |lua, this, (system, queries): (mlua::Function, mlua::MultiValue)| {
+                if queries.is_empty() {
+                    return Err(mlua::Error::BadArgument {
+                        to: Some("World:view".into()),
+                        pos: 2,
+                        name: Some("query...".into()),
+                        cause: Arc::new(mlua::Error::external(WorldError::LuaInvalidUsage(
+                            "no component types provided".into(),
+                        ))),
+                    });
                 }
 
-                // defer the entity spawn
-                // safety: Commands borrows Entities from World, the resource borrows from the world resouces,
-                // they are borrowing different parts of World.
-                let world_ptr: *mut World = world;
-                let mut commands_queue = world.get_resource_mut::<CommandQueue>();
-                let mut commands = Commands::new(&mut commands_queue, unsafe { &mut *world_ptr });
-                let entity = commands.spawn(bundle);
+                let world = this.read();
+                let mut view = DynamicViewState::new();
 
-                Ok(ScriptEntity(entity))
-            })
-            .method_mut(
-                "view",
-                |lua, this, (system, queries): (elua::Function, elua::ValueVec)| {
-                    if queries.is_empty() {
-                        return Err(elua::Error::BadArgument {
-                            func: Some("World:view".to_string()),
-                            arg_index: 2,
-                            arg_name: Some("query...".to_string()),
-                            error: Arc::new(elua::Error::other(WorldError::LuaInvalidUsage(
-                                "no component types provided".to_string(),
-                            ))),
-                        });
-                    }
+                for (idx, comp) in queries.into_iter().enumerate() {
+                    match comp {
+                        mlua::Value::Table(t) => {
+                            let name: String = t.get(mlua::MetaMethod::Type.name())?;
 
-                    let world = unsafe { this.inner.as_ref() };
-                    //let mut view = world.dynamic_view();
-                    let mut view = DynamicViewState::new();
-
-                    for (idx, comp) in queries.into_iter().enumerate() {
-                        match comp {
-                            elua::Value::Table(t) => {
-                                let name: String = t.get(elua::MetaMethod::Name)?;
-
-                                let lookup = world
-                                    .try_get_resource::<LuaTableProxyLookup>()
-                                    .ok_or(elua::Error::runtime(
-                                        "Unable to lookup table proxy, none were ever registered!",
-                                    ))?;
-                                let info = lookup.comp_info_from_name.get(&name).ok_or_else(
-                                    || elua::Error::BadArgument {
-                                        func: Some("World:view".to_string()),
-                                        arg_index: 2 + idx as i32,
-                                        arg_name: Some("query...".to_string()),
-                                        error: Arc::new(elua::Error::Runtime(format!(
+                            let lookup = world.get_resource::<LuaTableProxyLookup>().ok_or(
+                                mlua::Error::runtime(
+                                    "Unable to lookup table proxy, none were ever registered!",
+                                ),
+                            )?;
+                            let info = lookup.comp_info_from_name.get(&name).ok_or_else(|| {
+                                mlua::Error::BadArgument {
+                                    to: Some("World:view".into()),
+                                    pos: 2 + idx,
+                                    name: Some("query...".into()),
+                                    cause: Arc::new(mlua::Error::external(
+                                        WorldError::LuaInvalidUsage(format!(
                                             "the 'Table' with name {} is unknown to the engine!",
                                             name
-                                        ))),
-                                    },
-                                )?;
+                                        )),
+                                    )),
+                                }
+                            })?;
 
-                                let dyn_type = QueryDynamicType::from_info(info.clone());
-                                view.push(dyn_type);
-                            }
-                            elua::Value::Userdata(ud) => {
-                                let reflect = ud
-                                    .execute_function::<_, ScriptBorrow>(
-                                        FN_NAME_INTERNAL_REFLECT_TYPE,
-                                        (),
-                                    )
-                                    .expect("Type does not implement 'reflect_type' properly");
-                                let refl_comp = reflect.reflect_branch.as_component_unchecked();
-
-                                let dyn_type = QueryDynamicType::from_info(refl_comp.info);
-                                view.push(dyn_type);
-                            }
-                            _ => todo!(),
+                            let dyn_type = QueryDynamicType::from_info(info.clone());
+                            view.push(dyn_type);
                         }
-                    }
+                        mlua::Value::UserData(ud) => {
+                            let reflect = ud
+                                .call_function::<ScriptBorrow>(
+                                    FN_NAME_INTERNAL_REFLECT_TYPE,
+                                    (),
+                                )
+                                .expect("Type does not implement 'reflect_type' properly");
+                            let refl_comp = reflect.reflect_branch.as_component_unchecked();
 
-                    let iter = view.into_iter();
-                    let mut reflected_iter = ReflectedIterator {
-                        world: this.clone(),
-                        dyn_view: DynamicViewStateIter::from(iter),
-                        reflected_components: None,
-                    };
-
-                    let mut current = world.current_tick();
-                    let mut has_ticked = false;
-
-                    while let Some(row) = reflected_iter.next_lua(lua) {
-                        let r = row
-                            .row
-                            .into_iter()
-                            .map(|r| (r.comp_val, r.comp_ptr.cast::<()>()))
-                            .collect::<Vec<_>>();
-                        let (values, ptrs) =
-                            itertools::multiunzip::<(Vec<elua::Value>, Vec<NonNull<()>>), _>(r);
-                        let mult_val = elua::ValueVec::from(values);
-                        let res: elua::ValueVec = system.exec(mult_val)?;
-
-                        // if values were returned, find the type in the type registry, and apply the new values
-                        if res.len() <= ptrs.len() {
-                            // we only want to tick one time per system
-                            if !has_ticked {
-                                current = world.tick();
-                                has_ticked = true;
-                            }
-
-                            for (comp, ptr) in res.into_iter().zip(ptrs) {
-                                let lua_typeid = match &comp {
-                                    elua::Value::Userdata(ud) => {
-                                        let lua_comp = reflect_user_data(ud);
-                                        let refl_comp =
-                                            lua_comp.reflect_branch.as_component_unchecked();
-                                        refl_comp.info.type_id().as_rust()
-                                    },
-                                    elua::Value::Table(tbl) => {
-                                        let name: String = tbl.get(elua::MetaMethod::Name)?;
-
-                                        let lookup = world.get_resource::<LuaTableProxyLookup>();
-                                        *lookup.typeid_from_name.get(&name).unwrap()
-                                    },
-                                    _ => {
-                                        panic!("A userdata or table value was not returned!");
-                                        // TODO: Handle properly
-                                    }
-                                };
-
-                                // update the component tick
-                                let world = unsafe { this.inner.as_mut() };
-                                let arch = world.entity_archetype_mut(row.entity).unwrap();
-                                let idx = arch.entity_indexes().get(&row.entity).unwrap().clone();
-                                let c = arch.get_column_mut(lua_typeid).unwrap();
-                                c.entity_ticks[idx.0 as usize] = current;
-
-                                // apply the new component data
-                                let reg = this.as_ref().get_resource::<TypeRegistry>();
-                                let reg_type = reg.get_type(lua_typeid).unwrap();
-
-                                let proxy = reg_type
-                                    .get_data::<ReflectLuaProxy>()
-                                    // this should actually be safe since the ReflectedIterator
-                                    // attempts to get the type data before it is tried here
-                                    .expect("Type does not have ReflectLuaProxy as a TypeData");
-                                (proxy.fn_apply)(lua, ptr, &comp)?;
-                            }
-                        } else {
-                            let msg = format!(
-                                "Too many arguments were returned from the World view!
-                            At most, the expected number of results is {}.",
-                                ptrs.len()
-                            );
-                            return Err(elua::Error::Runtime(msg));
+                            let dyn_type = QueryDynamicType::from_info(refl_comp.info);
+                            view.push(dyn_type);
                         }
+                        _ => todo!(),
                     }
-
-                    Ok(())
-                },
-            )
-            .method_mut("resource", |lua, this, (ty,): (elua::Value,)| {
-                let reflect = match ty {
-                    elua::Value::Userdata(ud) => ud
-                        .execute_function::<_, ScriptBorrow>(FN_NAME_INTERNAL_REFLECT_TYPE, ())
-                        .expect("Type does not implement 'reflect_type' properly"),
-                    elua::Value::Table(t) => {
-                        let f: elua::Function = t.get(FN_NAME_INTERNAL_REFLECT_TYPE)?;
-                        f.exec::<_, ScriptBorrow>(())
-                            .expect("Type does not implement 'reflect_type' properly")
-                    }
-                    _ => {
-                        panic!("how");
-                    }
-                };
-                /* let reflect = ty
-                .execute_function::<_, ScriptBorrow>(FN_NAME_INTERNAL_REFLECT_TYPE, ())
-                .expect("Type does not implement 'reflect_type' properly"); */
-
-                let res = reflect.reflect_branch.as_resource_unchecked();
-                if let Some(res_ptr) = res.reflect_ptr(this.as_mut()) {
-                    let reg_type = this
-                        .as_ref()
-                        .get_type::<RegisteredType>(reflect.reflect_branch.reflect_type_id())
-                        .expect("Resource is not type registered!");
-                    let proxy = reg_type
-                        .get_data::<ReflectLuaProxy>()
-                        .expect("Type does not have ReflectLuaProxy as a TypeData");
-
-                    (proxy.fn_as_lua)(lua, res_ptr.cast()).and_then(|ud| ud.as_lua(lua))
-                } else {
-                    // if the resource is not found in the world, return nil
-                    Ok(elua::Value::Nil)
                 }
-            })
-            .method_mut("add_resource", |_, this, res: elua::Value| {
-                let reflect = match res {
-                    elua::Value::Userdata(ud) => ud
-                        .execute_method::<_, ScriptBorrow>(FN_NAME_INTERNAL_REFLECT, ())
-                        .expect("Type does not implement 'reflect_type' properly"),
-                    elua::Value::Table(t) => {
-                        let f: elua::Function = t.get(FN_NAME_INTERNAL_REFLECT)?;
-                        f.exec::<_, ScriptBorrow>(())
-                            .expect("Type does not implement 'reflect_type' properly")
-                    }
-                    _ => {
-                        panic!("how");
-                    }
+
+                let iter = view.into_iter();
+                let mut reflected_iter = ReflectedIterator {
+                    // SAFETY: bypassing the borrow checker here to get a pointer of the world
+                    // is required since we mutably borrow below. Its safe to do so since
+                    // only the entity ticks are updated. They are accessing different things
+                    // from the world.
+                    world: unsafe { NonNull::from(&*world).as_ref() },
+                    dyn_view: DynamicViewStateIter::from(iter),
+                    reflected_components: None,
                 };
 
-                let data = reflect.data
-                    .expect("Its expected that 'FN_NAME_INTERNAL_REFLECT' returns data in World:add_resource");
+                let current = world.current_tick();
 
-                let res = reflect.reflect_branch.as_resource()
-                    .ok_or(elua::Error::runtime("Provided type is not a resource!"))?;
+                // drop read lock and acquire the write lock.
+                // dropping must be done to avoid mutex deadlock
+                drop(world);
+                let mut world = this.write();
 
-                let world = this.as_mut();
-                res.insert(world, data);
+                while let Some(row) = reflected_iter.next_lua(lua) {
+                    let r = row.row.into_iter()
+                        .into_iter()
+                        .map(|r| (r.comp_val, r.comp_ptr.cast::<()>()))
+                        .collect::<Vec<_>>();
+                    let (values, ptrs) =
+                        itertools::multiunzip::<(Vec<mlua::Value>, Vec<NonNull<()>>), _>(r);
+                    let mult_val = mlua::MultiValue::from_iter(values.into_iter());
+                    let res: mlua::MultiValue = system.call(mult_val)?;
+
+                    // if values were returned, find the type in the type registry, and apply the new values
+                    if res.len() <= ptrs.len() {
+
+                        for (comp, ptr) in res.into_iter().zip(ptrs) {
+                            let lua_typeid = match &comp {
+                                mlua::Value::UserData(ud) => {
+                                    let lua_comp = reflect_user_data(ud);
+                                    let refl_comp =
+                                        lua_comp.reflect_branch.as_component_unchecked();
+                                    refl_comp.info.type_id().as_rust()
+                                }
+                                mlua::Value::Table(tbl) => {
+                                    let name: String = tbl.get(mlua::MetaMethod::Type.name())?;
+
+                                    let lookup = world.get_resource::<LuaTableProxyLookup>().unwrap();
+                                    *lookup.typeid_from_name.get(&name).unwrap()
+                                }
+                                _ => {
+                                    panic!("A userdata or table value was not returned!");
+                                    // TODO: Handle properly
+                                }
+                            };
+
+                            // update the component tick
+                            let arch = world.entity_archetype_mut(row.entity).unwrap();
+                            let idx = arch.entity_indexes().get(&row.entity).unwrap().clone();
+                            let c = arch.get_column_mut(lua_typeid).unwrap();
+                            c.entity_ticks[idx.0 as usize] = current;
+
+                            // apply the new component data
+                            let reg = world.get_resource::<TypeRegistry>().unwrap();
+                            let reg_type = reg.get_type(lua_typeid).unwrap();
+
+                            let proxy = reg_type
+                                .get_data::<ReflectLuaProxy>()
+                                // this should actually be safe since the ReflectedIterator
+                                // attempts to get the type data before it is tried here
+                                .expect("Type does not have ReflectLuaProxy as a TypeData");
+                            (proxy.fn_apply)(lua, ptr, &comp)?;
+                        }
+                    } else {
+                        let msg = format!(
+                            "Too many arguments were returned from the World view!
+                    At most, the expected number of results is {}.",
+                            ptrs.len()
+                        );
+                        return Err(mlua::Error::runtime(msg));
+                    }
+                }
 
                 Ok(())
-            })
-            .method_mut("request_res", |lua, this, path: String| {
-                let world: &mut World = this.as_mut();
-                let man = world.get_resource_mut::<ResourceManager>();
-                let handle = man.request_raw(&path).unwrap();
+            },
+        );
+        methods.add_method_mut("resource", |lua, this, (ty,): (mlua::Value,)| {
+            let reflect = match ty {
+                mlua::Value::UserData(ud) => ud
+                    .call_function::<ScriptBorrow>(FN_NAME_INTERNAL_REFLECT_TYPE, ())
+                    .expect("Type does not implement 'reflect_type' properly"),
+                mlua::Value::Table(t) => {
+                    let f: mlua::Function = t.get(FN_NAME_INTERNAL_REFLECT_TYPE)?;
+                    f.call::<ScriptBorrow>(())
+                        .expect("Type does not implement 'reflect_type' properly")
+                }
+                _ => {
+                    panic!("how");
+                }
+            };
 
-                // get the actual resource handle wrapper
-                let registry = world.get_resource::<TypeRegistry>();
-                let ty = registry.get_type(handle.resource_type_id())
-                    .expect("Could not find asset type in registry");
-                let data = ty.get_data::<LuaResHandleToComponent>()
-                    .expect("Asset type does not have 'LuaResHandleToComponent' as TypeData");
+            let mut world = this.write();
+            let res = reflect.reflect_branch.as_resource_unchecked();
+            if let Some(res_ptr) = res.reflect_ptr(&mut world) {
+                let reg_type = world
+                    .get_type::<RegisteredType>(reflect.reflect_branch.reflect_type_id())
+                    .expect("Resource is not type registered!");
+                let proxy = reg_type
+                    .get_data::<ReflectLuaProxy>()
+                    .expect("Type does not have ReflectLuaProxy as a TypeData");
 
-                Ok((data.fn_to_lua)(lua, handle).unwrap())
-            });
+                (proxy.fn_as_lua)(lua, res_ptr.cast()).and_then(|ud| ud.into_lua(lua))
+            } else {
+                // if the resource is not found in the world, return nil
+                Ok(mlua::Value::Nil)
+            }
+        });
+        methods.add_method_mut("add_resource", |_, this, res: mlua::Value| {
+            let reflect = match res {
+                mlua::Value::UserData(ud) => ud
+                    .call_method::<ScriptBorrow>(FN_NAME_INTERNAL_REFLECT, ())
+                    .expect("Type does not implement 'reflect_type' properly"),
+                mlua::Value::Table(t) => {
+                    let f: mlua::Function = t.get(FN_NAME_INTERNAL_REFLECT)?;
+                    f.call::<ScriptBorrow>(())
+                        .expect("Type does not implement 'reflect_type' properly")
+                }
+                _ => {
+                    panic!("how");
+                }
+            };
+
+            let data = reflect.data.expect(
+                "Its expected that 'FN_NAME_INTERNAL_REFLECT' returns data in World:add_resource",
+            );
+
+            let res = reflect
+                .reflect_branch
+                .as_resource()
+                .ok_or(mlua::Error::runtime("Provided type is not a resource!"))?;
+
+            let mut world = this.write();
+            res.insert(&mut world, data);
+
+            Ok(())
+        });
+        methods.add_method_mut("request_res", |lua, this, path: String| {
+            let world = this.write();
+            let man = world.get_resource_mut::<ResourceManager>().unwrap();
+            let handle = man.request_raw(&path).unwrap();
+
+            // get the actual resource handle wrapper
+            let registry = world.get_resource::<TypeRegistry>().unwrap();
+            let ty = registry
+                .get_type(handle.resource_type_id())
+                .expect("Could not find asset type in registry");
+            let data = ty
+                .get_data::<LuaResHandleToComponent>()
+                .expect("Asset type does not have 'LuaResHandleToComponent' as TypeData");
+
+            Ok((data.fn_to_lua)(lua, handle).unwrap())
+        });
     }
 }

lyra-scripting/src/lua/wrappers/asset/mod.rs

@@ -1,21 +1,23 @@
 use std::{any::TypeId, ops::Deref};
-use elua::{AnyUserdata, AsLua, FromLua, State, Value};
+//use mlua::{AnyUserData, IntoLua, FromLua, Lua, Value};
 use lyra_resource::{gltf::{Gltf, Material, Mesh}, Texture, ResHandle, UntypedResHandle};
 use lyra_game::scene::SceneGraph;
 use lyra_reflect::{Reflect, TypeData};
 use lyra_scripting_derive::{lua_wrap_handle, wrap_lua_struct};
 
-use crate::{lua::{LuaWrapper, FN_NAME_INTERNAL_AS_COMPONENT, FN_NAME_INTERNAL_REFLECT, FN_NAME_INTERNAL_REFLECT_TYPE}, lyra_engine, ScriptBorrow};
+use crate::{lua::{Error, LuaWrapper, FN_NAME_INTERNAL_AS_COMPONENT, FN_NAME_INTERNAL_REFLECT, FN_NAME_INTERNAL_REFLECT_TYPE}, lyra_engine, ScriptBorrow};
 
 use crate as lyra_scripting;
 
+use mlua::IntoLua;
+
 pub struct LuaResHandleToComponent {
     /// Create the userdata component that 
-    pub fn_to_lua: fn(&State, UntypedResHandle) -> Option<AnyUserdata>,
+    pub fn_to_lua: fn(&mlua::Lua, UntypedResHandle) -> Option<mlua::AnyUserData>,
 }
 
 impl LuaResHandleToComponent {
-    pub fn new(f: fn(&State, UntypedResHandle) -> Option<AnyUserdata>) -> Self {
+    pub fn new(f: fn(&mlua::Lua, UntypedResHandle) -> Option<mlua::AnyUserData>) -> Self {
         Self {
             fn_to_lua: f
         }
@@ -53,16 +55,12 @@ impl From<UntypedResHandle> for LuaResHandle {
     }
 }
 
-impl elua::Userdata for LuaResHandle {
-    fn name() -> String {
-        "Handle".to_string()
-    }
-
-    fn build<'a>(builder: &mut elua::UserdataBuilder<'a, Self>) {
-        builder.field_getter("path", |_, this| Ok(this.path()));
-        builder.field_getter("version", |_, this| Ok(this.version()));
-        builder.field_getter("uuid", |_, this| Ok(this.uuid().to_string()));
-        builder.field_getter("state", |_, this| {
+impl mlua::UserData for LuaResHandle {
+    fn add_fields<F: mlua::UserDataFields<Self>>(fields: &mut F) {
+        fields.add_field_method_get("path", |_, this| Ok(this.path()));
+        fields.add_field_method_get("version", |_, this| Ok(this.version()));
+        fields.add_field_method_get("uuid", |_, this| Ok(this.uuid().to_string()));
+        fields.add_field_method_get("state", |_, this| {
             let name = if this.is_loaded() {
                 "ready"
             } else if this.get_error().is_some() {
@@ -71,41 +69,43 @@ impl elua::Userdata for LuaResHandle {
 
             Ok(name)
         });
+    }    
 
-        builder.method("is_watched", |_, this, ()| {
+    fn add_methods<M: mlua::UserDataMethods<Self>>(methods: &mut M) {
+        methods.add_method("is_watched", |_, this, ()| {
             Ok(this.is_watched())
         });
-
-        builder.method("is_loaded", |_, this, ()| {
+        
+        methods.add_method("is_loaded", |_, this, ()| {
             Ok(this.is_loaded())
         });
-
-        builder.method("wait_until_loaded", |_, this, ()| {
+        
+        methods.add_method("wait_until_loaded", |_, this, ()| {
             this.wait_recurse_dependencies_load();
 
             Ok(())
         });
 
-        builder.method(FN_NAME_INTERNAL_AS_COMPONENT, |lua, this, ()| {
+        methods.add_method(FN_NAME_INTERNAL_AS_COMPONENT, |lua, this, ()| {
             let handle = &this.0;
 
             if let Some(handle) = handle.as_typed::<SceneGraph>() {
-                LuaSceneHandle(handle).as_lua(lua)
+                LuaSceneHandle(handle).into_lua(lua)
             } else if let Some(handle) = handle.as_typed::<Gltf>() {
-                LuaGltfHandle(handle).as_lua(lua)
+                LuaGltfHandle(handle).into_lua(lua)
             } else {
-                Ok(elua::Value::Nil)
+                Ok(mlua::Value::Nil)
             }
         });
     }
 }
 
-impl<'a> FromLua<'a> for LuaResHandle {
-    fn from_lua(_: &'a elua::State, val: elua::Value<'a>) -> elua::Result<Self> {
+impl mlua::FromLua for LuaResHandle {
+    fn from_lua(val: mlua::Value, _: &mlua::Lua) -> mlua::Result<Self> {
         let tyname = val.type_name();
         let ud = val.as_userdata()
-            .ok_or(elua::Error::type_mismatch("Handle", &tyname))?;
-        let handle = ud.as_ref::<LuaResHandle>()?;
+            .ok_or(mlua::Error::external(Error::type_mismatch("Handle", &tyname)))?;
+        let handle = ud.borrow::<LuaResHandle>()?;
         
         Ok(handle.clone())
     }
@@ -121,11 +121,11 @@ lua_wrap_handle!(Mesh,
         (material, {
             data.material.clone()
                 .map(|v| LuaMaterialHandle(v.clone()))
-                .as_lua(lua)
+                .into_lua(lua)
         })
     },
     {
-        builder.method("indices", |lua, this, ()| {
+        methods.add_method("indices", |lua, this, ()| {
             if let Some(data) = this.0.data_ref() {
                 let table = lua.create_table()?;
     
@@ -133,21 +133,21 @@ lua_wrap_handle!(Mesh,
                     Some(lyra_resource::gltf::MeshIndices::U16(v)) => {
                         for (i, ind) in v.iter().enumerate() {
                             let i = i as i64 + 1; // lua indexes start at 1
-                            table.raw_seti(i, *ind)?;
+                            table.raw_set(i, *ind)?;
                         }
                     },
                     Some(lyra_resource::gltf::MeshIndices::U32(v)) => {
                         for (i, ind) in v.iter().enumerate() {
                             let i = i as i64 + 1; // lua indexes start at 1
-                            table.raw_seti(i, *ind)?;
+                            table.raw_set(i, *ind)?;
                         }
                     },
                     None => {},
                 }
     
-                Ok(Value::Table(table))
+                Ok(mlua::Value::Table(table))
             } else {
-                Ok(Value::Nil)
+                Ok(mlua::Value::Nil)
             }
         });
 
@@ -167,17 +167,17 @@ lua_wrap_handle!(Material,
         (base_color_texture, {
             data.base_color_texture.clone()
                 .map(|v| LuaTextureHandle(v.clone()))
-                .as_lua(lua)
+                .into_lua(lua)
         }),
         (metallic_roughness_texture, {
             data.metallic_roughness_texture.clone()
                 .map(|v| LuaTextureHandle(v.clone()))
-                .as_lua(lua)
+                .into_lua(lua)
         }),
         (pbr_glossiness, {
             data.pbr_glossiness.clone()
                 .map(|v| LuaPbrGlossiness(v.clone()))
-                .as_lua(lua)
+                .into_lua(lua)
         }),
         alpha_cutoff,
         (alpha_mode, {
@@ -186,55 +186,57 @@ lua_wrap_handle!(Material,
                 lyra_resource::gltf::AlphaMode::Opaque => "opaque",
                 lyra_resource::gltf::AlphaMode::Mask => "mask",
                 lyra_resource::gltf::AlphaMode::Blend => "blend",
-            }.as_lua(lua)
+            }.into_lua(lua)
         }),
         (specular, {
             data.specular.clone()
                 .map(|v| LuaSpecular(v.clone()))
-                .as_lua(lua)
+                .into_lua(lua)
         }),
     }
 );
 
 lua_wrap_handle!(Gltf, {
-    builder.method("scenes", |lua, this, ()| {
+    methods.add_method("scenes", |lua, this, ()| {
         if let Some(data) = this.0.data_ref() {
             let table = lua.create_table()?;
 
             for (i, scene) in data.scenes.iter().enumerate() {
                 let i = i as i64 + 1; // lua indexes start at 1
-                table.raw_seti(i, LuaSceneHandle(scene.clone()))?;
+                table.raw_set(i, LuaSceneHandle(scene.clone()))?;
             }
 
-            Ok(Value::Table(table))
+            Ok(mlua::Value::Table(table))
         } else {
-            Ok(Value::Nil)
+            Ok(mlua::Value::Nil)
         }
-    }).method("materials", |lua, this, ()| {
+    });
+    methods.add_method("materials", |lua, this, ()| {
         if let Some(data) = this.0.data_ref() {
             let table = lua.create_table()?;
 
             for (i, mat) in data.materials.iter().enumerate() {
                 let i = i as i64 + 1; // lua indexes start at 1
-                table.raw_seti(i, LuaMaterialHandle(mat.clone()))?;
+                table.raw_set(i, LuaMaterialHandle(mat.clone()))?;
             }
 
-            Ok(Value::Table(table))
+            Ok(mlua::Value::Table(table))
         } else {
-            Ok(Value::Nil)
+            Ok(mlua::Value::Nil)
         }
-    }).method("meshes", |lua, this, ()| {
+    });
+    methods.add_method("meshes", |lua, this, ()| {
         if let Some(data) = this.0.data_ref() {
             let table = lua.create_table()?;
 
             for (i, mesh) in data.meshes.iter().enumerate() {
                 let i = i as i64 + 1; // lua indexes start at 1
-                table.raw_seti(i, LuaMeshHandle(mesh.clone()))?;
+                table.raw_set(i, LuaMeshHandle(mesh.clone()))?;
             }
 
-            Ok(Value::Table(table))
+            Ok(mlua::Value::Table(table))
         } else {
-            Ok(Value::Nil)
+            Ok(mlua::Value::Nil)
         }
     });
 });

lyra-scripting/src/lua/wrappers/delta_time.rs

@@ -21,15 +21,15 @@ impl std::ops::DerefMut for LuaDeltaTime {
     }
 }
 
-impl<'lua> elua::FromLua<'lua> for LuaDeltaTime {
-    fn from_lua(_: &'lua elua::State, _: elua::Value<'lua>) -> elua::Result<Self> {
+impl mlua::FromLua for LuaDeltaTime {
+    fn from_lua(_: mlua::Value, _: &mlua::Lua) -> mlua::Result<Self> {
         todo!()
     }
 }
 
-impl<'lua> elua::AsLua<'lua> for LuaDeltaTime {
-    fn as_lua(self, _: &'lua elua::State) -> elua::Result<elua::Value<'lua>> {
-        Ok(elua::Value::Number(*self.0 as f64))
+impl mlua::IntoLua for LuaDeltaTime {
+    fn into_lua(self, _: &mlua::Lua) -> mlua::Result<mlua::Value> {
+        Ok(mlua::Value::Number(*self.0 as f64))
     }
 }
 

lyra-scripting/src/lua/wrappers/input_actions.rs

@@ -1,5 +1,6 @@
 use lyra_game::input::{keycode_from_str, Action, ActionHandler, ActionKind, ActionMapping, ActionMappingId, ActionSource, ActionState, LayoutId, MouseAxis, MouseInput};
-use crate::lyra_engine;
+use mlua::IntoLua;
+use crate::{lua::Error, lyra_engine};
 
 use lyra_reflect::Reflect;
 
@@ -10,27 +11,23 @@ pub struct LuaActionHandler {
     handler: ActionHandler
 }
 
-impl elua::Userdata for LuaActionHandler {
-    fn name() -> String {
-        "ActionHandler".to_string()
-    }
-
-    fn build<'a>(builder: &mut elua::UserdataBuilder<'a, Self>) {
-        builder.function("new", |_, table: elua::Table| {
+impl mlua::UserData for LuaActionHandler {
+    fn add_methods<M: mlua::UserDataMethods<Self>>(methods: &mut M) {
+        methods.add_function("new", |_, table: mlua::Table| {
             let mut handler = ActionHandler::new();
 
             // create the layouts and add them to the handler
-            let layouts = table.get::<_, elua::Table>("layouts")
-                .map_err(|_| elua::Error::runtime("missing 'layouts' in ActionHandler table"))?;
-            for layout_id in layouts.sequence_iter::<u32>() {
+            let layouts = table.get::<mlua::Table>("layouts")
+                .map_err(|_| mlua::Error::runtime("missing 'layouts' in ActionHandler table"))?;
+            for layout_id in layouts.sequence_values::<u32>() {
                 let layout_id = layout_id?;
 
                 handler.add_layout(LayoutId(layout_id));
             }
 
             // add the actions to the handler
-            let actions = table.get::<_, elua::Table>("actions")
-                .map_err(|_| elua::Error::runtime("missing 'actions' in ActionHandler table"))?;
+            let actions = table.get::<mlua::Table>("actions")
+                .map_err(|_| mlua::Error::runtime("missing 'actions' in ActionHandler table"))?;
             for pair in actions.pairs::<String, String>() {
                 let (action_lbl, action_type) = pair?;
                 let action_type = action_type.to_lowercase();
@@ -45,26 +42,26 @@ impl elua::Userdata for LuaActionHandler {
             }
 
             // find the mappings and start processing them
-            let mappings= table.get::<_, elua::Table>("mappings")
-                .map_err(|_| elua::Error::runtime("missing 'mappings' in ActionHandler table"))?;
-            for (map_id, tbl) in mappings.sequence_iter::<elua::Table>().enumerate() {
+            let mappings= table.get::<mlua::Table>("mappings")
+                .map_err(|_| mlua::Error::runtime("missing 'mappings' in ActionHandler table"))?;
+            for (map_id, tbl) in mappings.sequence_values::<mlua::Table>().enumerate() {
                 let tbl = tbl?;
                 
-                let layout_id = tbl.get::<_, u32>("layout")?;
+                let layout_id = tbl.get::<u32>("layout")?;
                 let mut mapping = ActionMapping::new(LayoutId(layout_id), ActionMappingId(map_id as u32));
 
                 // find the binds and start processing them
                 // the keys are used as the action names, and then the value is an array (lua table)
-                let binds_tbl = tbl.get::<_, elua::Table>("binds")
-                    .map_err(|_| elua::Error::runtime("missing 'binds' in ActionHandler 'mappings' table"))?;
-                for pair in binds_tbl.pairs::<String, elua::Table>() {
+                let binds_tbl = tbl.get::<mlua::Table>("binds")
+                    .map_err(|_| mlua::Error::runtime("missing 'binds' in ActionHandler 'mappings' table"))?;
+                for pair in binds_tbl.pairs::<String, mlua::Table>() {
                     let (action_lbl, input_binds) = pair?;
 
-                    for input in input_binds.sequence_iter::<String>() {
+                    for input in input_binds.sequence_values::<String>() {
                         let input = input?.to_lowercase();
                         
                         let action = handler.action(&action_lbl)
-                            .ok_or(elua::Error::Runtime(format!("Unknown action specified in mapping binds: {}", action_lbl)))?;
+                            .ok_or(mlua::Error::runtime(format!("Unknown action specified in mapping binds: {}", action_lbl)))?;
                         
                         let mut binds = Vec::new();
 
@@ -77,18 +74,18 @@ impl elua::Userdata for LuaActionHandler {
                                 let axis_name = input_split[2];
 
                                 let src = process_axis_string(input_name, axis_name)
-                                    .ok_or(elua::Error::Runtime(format!("invalid bind '{input_name}', unable to find device or axis for device")))?;
+                                    .ok_or(mlua::Error::runtime(format!("invalid bind '{input_name}', unable to find device or axis for device")))?;
                                 binds.push(src.into_binding());
                             } else {
                                 // splits 'down=1' into 'down' and '1'
                                 let (button, val_str) = button.split_once("=")
-                                    .ok_or(elua::Error::Runtime(format!("invalid bind string for Axis Action: '{input}' (expected '=' with float)")))?;
+                                    .ok_or(mlua::Error::runtime(format!("invalid bind string for Axis Action: '{input}' (expected '=' with float)")))?;
 
                                 let val = val_str.parse::<f32>()
-                                    .map_err(|e| elua::Error::Runtime(format!("invalid bind string for Axis Action: '{input}' ({e})")))?;
+                                    .map_err(|e| mlua::Error::runtime(format!("invalid bind string for Axis Action: '{input}' ({e})")))?;
                                 
                                 let src = process_keyboard_string(button)
-                                    .ok_or(elua::Error::Runtime(format!("invalid key in bind: '{button}'")))?;
+                                    .ok_or(mlua::Error::runtime(format!("invalid key in bind: '{button}'")))?;
                                 binds.push(src.into_binding_modifier(val));
                             }
                         } else {
@@ -105,23 +102,29 @@ impl elua::Userdata for LuaActionHandler {
             Ok(LuaActionHandler {
                 handler,
             })
-        })
-        .method("get_axis", |_, this, action: String| {
+        });
+
+        methods.add_method("get_axis", |_, this, action: String| {
             Ok(this.handler.get_axis_modifier(action))
-        })
-        .method("is_pressed", |_, this, action: String| {
+        });
+
+        methods.add_method("is_pressed", |_, this, action: String| {
             Ok(this.handler.is_action_pressed(action))
-        })
-        .method("was_just_pressed", |_, this, action: String| {
+        });
+
+        methods.add_method("was_just_pressed", |_, this, action: String| {
             Ok(this.handler.was_action_just_pressed(action))
-        })
-        .method("was_just_released", |_, this, action: String| {
+        });
+
+        methods.add_method("was_just_released", |_, this, action: String| {
             Ok(this.handler.was_action_just_released(action))
-        })
-        .method("get_just_pressed", |_, this, action: String| {
+        });
+
+        methods.add_method("get_just_pressed", |_, this, action: String| {
             Ok(this.handler.get_just_pressed_modifier(action))
-        })
-        .method("get_action_state", |lua, this, action: String| {
+        });
+
+        methods.add_method("get_action_state", |lua, this, action: String| {
             let state = this.handler.get_action_state(action);
 
             let (name, val) = match state {
@@ -133,28 +136,29 @@ impl elua::Userdata for LuaActionHandler {
                 ActionState::Other(v) => ("Other", Some(v)),
             };
 
-            let mut multi = elua::ValueVec::new();
-            multi.push_val(lua, name)?;
-            multi.push_val(lua, val)?;
+            let mut multi = Vec::new();
+            multi.push(name.into_lua(lua)?);
+            multi.push(val.into_lua(lua)?);
             
-            Ok(elua::Value::Multi(multi))
-        })
-        .method(FN_NAME_INTERNAL_REFLECT, |_, this, ()| {
-            Ok(ScriptBorrow::from_resource::<ActionHandler>(Some(this.handler.clone())))
-        })
-        .function(FN_NAME_INTERNAL_REFLECT_TYPE, |_, ()| {
-            Ok(ScriptBorrow::from_resource::<ActionHandler>(None))
+            Ok(mlua::MultiValue::from_iter(multi.into_iter()))
         });
 
+        methods.add_method(FN_NAME_INTERNAL_REFLECT, |_, this, ()| {
+            Ok(ScriptBorrow::from_resource::<ActionHandler>(Some(this.handler.clone())))
+        });
+
+        methods.add_function(FN_NAME_INTERNAL_REFLECT_TYPE, |_, ()| {
+            Ok(ScriptBorrow::from_resource::<ActionHandler>(None))
+        });
     }
 }
 
-impl<'a> elua::FromLua<'a> for LuaActionHandler {
-    fn from_lua(_: &'a elua::State, val: elua::Value<'a>) -> elua::Result<Self> {
+impl mlua::FromLua for LuaActionHandler {
+    fn from_lua(val: mlua::Value, _: &mlua::Lua) -> mlua::Result<Self> {
         let tyname = val.type_name();
         let ud = val.as_userdata()
-            .ok_or(elua::Error::type_mismatch("ActionHandler", &tyname))?;
-        let handle = ud.as_ref::<LuaActionHandler>()?;
+            .ok_or(mlua::Error::external(Error::type_mismatch("ActionHandler", &tyname)))?;
+        let handle = ud.borrow::<LuaActionHandler>()?;
         
         Ok(handle.clone())
     }

lyra-scripting/src/lua/wrappers/math.rs

@@ -1,6 +1,7 @@
-use lyra_scripting_derive::{lua_vec_wrap_extension, wrap_lua_struct};
 use crate::lyra_engine;
 use lyra_game::math;
+use lyra_scripting_derive::{lua_vec_wrap_extension, wrap_lua_struct};
+use mlua::FromLuaMulti;
 
 use crate as lyra_scripting;
 
@@ -20,13 +21,15 @@ wrap_lua_struct!(
     {
         lua_vec_wrap_extension!(math::Vec2, LuaVec2);
 
-        builder.method_mut("move_by", |lua, this, vals: elua::ValueVec| {
+        methods.add_method_mut("move_by", |lua, this, vals: mlua::MultiValue| {
             let vals_clone = vals.clone();
-            if let Some((x, y)) = vals.try_into_vals::<(f32, f32)>(lua)? {
+            if let Ok((x, y)) = <(f32, f32) as FromLuaMulti>::from_lua_multi(vals, lua) {
                 this.x += x;
                 this.y += y;
-            } else if let Some(v) = vals_clone.try_into_vals::<Self>(lua)? {
+            } else if let Ok(v) = Self::from_lua_multi(vals_clone, lua) {
                 this.0 += v.0;
+            } else {
+                todo!("handle invalid argument error");
             }
 
             Ok(())
@@ -50,14 +53,16 @@ wrap_lua_struct!(
     {
         lua_vec_wrap_extension!(math::Vec3, LuaVec3);
 
-        builder.method_mut("move_by", |lua, this, vals: elua::ValueVec| {
+        methods.add_method_mut("move_by", |lua, this, vals: mlua::MultiValue| {
             let vals_clone = vals.clone();
-            if let Some((x, y, z)) = vals.try_into_vals::<(f32, f32, f32)>(lua)? {
+            if let Ok((x, y, z)) = <(f32, f32, f32) as FromLuaMulti>::from_lua_multi(vals, lua) {
                 this.x += x;
                 this.y += y;
                 this.z += z;
-            } else if let Some(v) = vals_clone.try_into_vals::<Self>(lua)? {
+            } else if let Ok(v) = Self::from_lua_multi(vals_clone, lua) {
                 this.0 += v.0;
+            } else {
+                todo!("handle invalid argument error");
             }
 
             Ok(())
@@ -98,70 +103,70 @@ wrap_lua_struct!(
     ),
     {
         // manually implemented since Quat doesn't have a `new` function
-        builder.function("new", |_, (x, y, z, w)| {
+        methods.add_function("new", |_, (x, y, z, w)| {
             Ok(Self(math::Quat::from_xyzw(x, y, z, w)))
         });
 
-        builder.function("from_rotation_x", |_, (rad,)| {
+        methods.add_function("from_rotation_x", |_, (rad,)| {
             let q = math::Quat::from_rotation_x(rad);
             Ok(Self(q))
         });
 
-        builder.function("from_rotation_y", |_, (rad,)| {
+        methods.add_function("from_rotation_y", |_, (rad,)| {
             let q = math::Quat::from_rotation_y(rad);
             Ok(Self(q))
         });
 
-        builder.function("from_rotation_z", |_, (rad,)| {
+        methods.add_function("from_rotation_z", |_, (rad,)| {
             let q = math::Quat::from_rotation_z(rad);
             Ok(Self(q))
         });
 
-        builder.method("dot", |_, this, (rhs,): (Self,)| {
+        methods.add_method("dot", |_, this, (rhs,): (Self,)| {
             Ok(this.dot(rhs.0))
         });
 
-        builder.method("length", |_, this, ()| {
+        methods.add_method("length", |_, this, ()| {
             Ok(this.length())
         });
 
-        builder.method("length_squared", |_, this, ()| {
+        methods.add_method("length_squared", |_, this, ()| {
             Ok(this.length_squared())
         });
 
-        builder.method_mut("normalize", |_, this, ()| {
+        methods.add_method_mut("normalize", |_, this, ()| {
             this.0 = this.normalize();
             Ok(())
         });
 
-        builder.method_mut("mult_quat", |_, this, (rhs,): (Self,)| {
+        methods.add_method_mut("mult_quat", |_, this, (rhs,): (Self,)| {
             this.0 *= rhs.0;
             Ok(())
         });
 
-        builder.method("mult_vec3", |_, this, (rhs,): (LuaVec3,)| {
+        methods.add_method("mult_vec3", |_, this, (rhs,): (LuaVec3,)| {
             Ok(LuaVec3(this.0 * rhs.0))
         });
 
         // manually implemented here since multiplying may not return `Self`.
-        builder.meta_method(elua::MetaMethod::Mul, |lua, this, (val,): (elua::Value,)| {
-            use elua::AsLua;
+        methods.add_meta_method(mlua::MetaMethod::Mul, |lua, this, (val,): (mlua::Value,)| {
+            use mlua::IntoLua;
 
             match val {
-                elua::Value::Userdata(ud) => {
-                    if ud.is::<LuaVec3>()? {
-                        let v3 = ud.as_ref::<LuaVec3>()?;
+                mlua::Value::UserData(ud) => {
+                    if ud.is::<LuaVec3>() {
+                        let v3 = ud.borrow::<LuaVec3>()?;
                         LuaVec3(this.0 * v3.0)
-                            .as_lua(lua)
+                            .into_lua(lua)
                     } else {
-                        let quat = ud.as_ref::<LuaQuat>()?;
+                        let quat = ud.borrow::<LuaQuat>()?;
                         LuaQuat(this.0 * quat.0)
-                            .as_lua(lua)
+                            .into_lua(lua)
                     }
                 },
-                elua::Value::Number(n) => {
+                mlua::Value::Number(n) => {
                     LuaQuat(this.0 * (n as f32))
-                        .as_lua(lua)
+                        .into_lua(lua)
                 },
                 _ => {
                     todo!()
@@ -169,7 +174,7 @@ wrap_lua_struct!(
             }
         });
 
-        builder.method("lerp", |_, this, (rhs, alpha): (Self, f32)| {
+        methods.add_method("lerp", |_, this, (rhs, alpha): (Self, f32)| {
             Ok(Self(this.lerp(*rhs, alpha)))
         });
     }
@@ -180,94 +185,94 @@ wrap_lua_struct!(
     derives(PartialEq, Copy),
     metamethods(ToString, Eq),
     {
-        builder.function("default", |_, ()| {
+        methods.add_function("default", |_, ()| {
             Ok(Self(math::Transform::default()))
         });
 
-        builder.function("new", |_, (pos, rot, scale): (LuaVec3, LuaQuat, LuaVec3)| {
+        methods.add_function("new", |_, (pos, rot, scale): (LuaVec3, LuaQuat, LuaVec3)| {
             Ok(Self(math::Transform::new(*pos, *rot, *scale)))
         });
-        
-        builder.function("from_translation", |_, (pos,): (LuaVec3,)| {
+
+        methods.add_function("from_translation", |_, (pos,): (LuaVec3,)| {
             Ok(Self(math::Transform::from_translation(*pos)))
         });
-        
-        builder.function("from_xyz", |_, (x, y, z)| {
+
+        methods.add_function("from_xyz", |_, (x, y, z)| {
             Ok(Self(math::Transform::from_xyz(x, y, z)))
         });
 
-        builder.method("clone", |_, this, ()| {
+        methods.add_method("clone", |_, this, ()| {
             Ok(this.clone())
         });
 
-        builder.method("forward", |_, this, ()| {
+        methods.add_method("forward", |_, this, ()| {
             Ok(LuaVec3(this.forward()))
         });
 
-        builder.method("left", |_, this, ()| {
+        methods.add_method("left", |_, this, ()| {
             Ok(LuaVec3(this.left()))
         });
 
-        builder.method("up", |_, this, ()| {
+        methods.add_method("up", |_, this, ()| {
             Ok(LuaVec3(this.up()))
         });
 
-        builder.method_mut("rotate", |_, this, (quat,): (LuaQuat,)| {
+        methods.add_method_mut("rotate", |_, this, (quat,): (LuaQuat,)| {
             this.rotate(*quat);
             Ok(())
         });
 
-        builder.method_mut("rotate_x", |_, this, (deg,): (f32,)| {
+        methods.add_method_mut("rotate_x", |_, this, (deg,): (f32,)| {
             this.rotate_x(math::Angle::Degrees(deg));
             Ok(())
         });
 
-        builder.method_mut("rotate_y", |_, this, (deg,): (f32,)| {
+        methods.add_method_mut("rotate_y", |_, this, (deg,): (f32,)| {
             this.rotate_y(math::Angle::Degrees(deg));
             Ok(())
         });
 
-        builder.method_mut("rotate_z", |_, this, (deg,): (f32,)| {
+        methods.add_method_mut("rotate_z", |_, this, (deg,): (f32,)| {
             this.rotate_z(math::Angle::Degrees(deg));
             Ok(())
         });
 
-        builder.method_mut("rotate_x_rad", |_, this, (rad,): (f32,)| {
+        methods.add_method_mut("rotate_x_rad", |_, this, (rad,): (f32,)| {
             this.rotate_x(math::Angle::Radians(rad));
             Ok(())
         });
 
-        builder.method_mut("rotate_y_rad", |_, this, (rad,): (f32,)| {
+        methods.add_method_mut("rotate_y_rad", |_, this, (rad,): (f32,)| {
             this.rotate_y(math::Angle::Radians(rad));
             Ok(())
         });
 
-        builder.method_mut("rotate_z_rad", |_, this, (rad,): (f32,)| {
+        methods.add_method_mut("rotate_z_rad", |_, this, (rad,): (f32,)| {
             this.rotate_z(math::Angle::Radians(rad));
             Ok(())
         });
 
-        builder.method_mut("translate", |_, this, (x, y, z): (f32, f32, f32)| {
+        methods.add_method_mut("translate", |_, this, (x, y, z): (f32, f32, f32)| {
             this.translate(x, y, z);
             Ok(())
         });
 
-        builder.method("lerp", |_, this, (rhs, alpha): (Self, f32)| {
+        methods.add_method("lerp", |_, this, (rhs, alpha): (Self, f32)| {
             Ok(Self(this.lerp(*rhs, alpha)))
         });
 
         // rotate a transform
-        builder.meta_method(elua::MetaMethod::Mul, |_, this, (quat,): (LuaQuat,)| {
+        methods.add_meta_method(mlua::MetaMethod::Mul, |_, this, (quat,): (LuaQuat,)| {
             let mut t = *this;
             t.rotation *= *quat;
             Ok(t)
         });
 
         // move a transform
-        builder.meta_method(elua::MetaMethod::Add, |_, this, (pos,): (LuaVec3,)| {
+        methods.add_meta_method(mlua::MetaMethod::Add, |_, this, (pos,): (LuaVec3,)| {
             let mut t = *this;
             t.translation += *pos;
             Ok(t)
         });
     }
-);
+);

lyra-scripting/src/world.rs

@@ -1,6 +1,7 @@
-use std::ptr::NonNull;
+use std::{ops::Deref, ptr::NonNull, sync::Arc};
 
 use lyra_ecs::{World, Entity};
+use parking_lot::{MappedRwLockReadGuard, MappedRwLockWriteGuard, RwLock, RwLockReadGuard, RwLockWriteGuard};
 
 #[derive(Clone)]
 pub struct ScriptEntity(pub Entity);
@@ -14,33 +15,41 @@ impl std::ops::Deref for ScriptEntity {
 }
 
 #[derive(Clone)]
-pub struct ScriptWorldPtr {
-    pub inner: NonNull<World>,
-}
+pub struct ScriptWorldPtr(Arc<RwLock<NonNull<World>>>);
 
 impl ScriptWorldPtr {
-    /// Creates a world pointer from a world borrow.
-    pub fn from_ref(world: &World) -> Self {
-        Self {
-            inner: NonNull::from(world),
-        }
+    pub fn read(&self) -> MappedRwLockReadGuard<World> {
+        RwLockReadGuard::map(self.0.read(), |p| unsafe { p.as_ref() })
     }
 
-    /// Returns a borrow to the world from the ptr.
-    pub fn as_ref(&self) -> &World {
-        unsafe { self.inner.as_ref() }
-    }
-
-    /// Returns a mutable borrow to the world from the ptr.
-    pub fn as_mut(&mut self) -> &mut World {
-        unsafe { self.inner.as_mut() }
+    pub fn write(&self) -> MappedRwLockWriteGuard<World> {
+        RwLockWriteGuard::map(self.0.write(), |p| unsafe { p.as_mut() })
     }
 }
 
-impl std::ops::Deref for ScriptWorldPtr {
-    type Target = NonNull<World>;
+// SAFETY: The inner NonNull pointer is wrapped in an Arc<RwLock<>>
+unsafe impl Send for ScriptWorldPtr {}
+unsafe impl Sync for ScriptWorldPtr {}
+
+#[derive(Clone)]
+pub struct ScriptWorldPtrGuard(ScriptWorldPtr);
+
+impl Deref for ScriptWorldPtrGuard {
+    type Target = ScriptWorldPtr;
 
     fn deref(&self) -> &Self::Target {
-        &self.inner
+        &self.0
+    }
+}
+
+impl ScriptWorldPtrGuard {
+    /// Creates a new world pointer.
+    /// 
+    /// # Safety
+    /// The original `&mut World` must not be used while this guard is created.
+    /// The [World] may only be accessed through this guard or one of its cloned [ScriptWorldPtr]s.
+    #[allow(clippy::arc_with_non_send_sync)]
+    pub unsafe fn new(world: &mut World) -> Self {
+        ScriptWorldPtrGuard(ScriptWorldPtr(Arc::new(RwLock::new(NonNull::from(world)))))
     }
 }

lyra-scripting/src/wrap.rs

@@ -9,4 +9,7 @@ impl std::ops::Deref for ScriptDynamicBundle {
     fn deref(&self) -> &Self::Target {
         &self.0
     }
-}
+}
+
+// SAFETY: todo!()
+unsafe impl Send for ScriptDynamicBundle {}