examples/lua-scripting/scripts/test.lua

@@ -51,12 +51,12 @@ function on_update()
     end, Transform) ]]
 
     ---@type number
-    --[[ local dt = world:resource(DeltaTime)
+    local dt = world:resource(DeltaTime)
 
     world:view(function (t)
         t:translate(0, 0.15 * dt, 0)
         return t
-    end, Transform) ]]
+    end, Transform)
 end
 
 --[[ function on_post_update()

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

@@ -224,7 +224,7 @@ impl MetaMethod {
                         // 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(mt) = ud.metatable() {
                                 if let Ok(name) = mt.get::<String>("__name") {
                                     return Err(mlua::Error::BadArgument { 
                                         to: Some(format!("{}.__{}", #wrapped_str, #mt_lua_name)),

lyra-scripting/src/lua/dynamic_iter.rs

@@ -6,8 +6,6 @@ use lyra_reflect::TypeRegistry;
 #[cfg(feature = "lua")]
 use super::ReflectLuaProxy;
 
-use crate::ScriptWorldPtr;
-
 #[cfg(feature = "lua")]
 pub struct ReflectedItem {
     //pub proxy: &'a ReflectLuaProxy,
@@ -21,23 +19,23 @@ pub struct ReflectedRow {
     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 mlua::Lua) -> Option<ReflectedRow> {
+    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(&world);
+        //let world = self.world.read();
+        let n = self.dyn_view.next(&self.world);
         
         if let Some((en, row)) = n {
             if self.reflected_components.is_none() {
-                self.reflected_components = world.get_resource::<TypeRegistry>()
+                self.reflected_components = self.world.get_resource::<TypeRegistry>()
                     .map(|r| NonNull::from(r.deref()));
             }
 

lyra-scripting/src/lua/proxy.rs

@@ -36,8 +36,7 @@ where
         this: &dyn Reflect,
     ) -> mlua::Result<mlua::Value> {
         let this = this.as_any().downcast_ref::<T>().unwrap();
-        lua.create_userdata(this.clone())
-            .and_then(|ud| ud.into_lua(lua))
+        this.clone().into_lua(lua)
     }
 
     fn apply(

lyra-scripting/src/lua/world.rs

@@ -155,13 +155,21 @@ impl mlua::UserData for ScriptWorldPtr {
 
                 let iter = view.into_iter();
                 let mut reflected_iter = ReflectedIterator {
-                    world: this.clone(),
+                    // 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 mut current = world.current_tick();
-                let mut has_ticked = false;
+                let current = world.current_tick();
+
+                // drop read lock and acquire the write lock.
+                // dropping must be done to avoid mutex deadlock
+                drop(world);
+                let mut world = this.write();
 
                 while let Some(row) = reflected_iter.next_lua(lua) {
                     let r = row.row.into_iter()
@@ -175,11 +183,6 @@ impl mlua::UserData for ScriptWorldPtr {
 
                     // 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 {
@@ -202,7 +205,6 @@ impl mlua::UserData for ScriptWorldPtr {
                             };
 
                             // update the component tick
-                            let mut world = this.write();
                             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();
@@ -246,9 +248,6 @@ impl mlua::UserData for ScriptWorldPtr {
                     panic!("how");
                 }
             };
-            /* let reflect = ty
-            .execute_function::<ScriptBorrow>(FN_NAME_INTERNAL_REFLECT_TYPE, ())
-            .expect("Type does not implement 'reflect_type' properly"); */
 
             let mut world = this.write();
             let res = reflect.reflect_branch.as_resource_unchecked();