Handle::from_untyped

src/asset/mod.rs

@@ -22,6 +22,14 @@ impl<T> Handle<T> {
             marker: PhantomData,
         }
     }
+
+    pub fn from_untyped(untyped_handle: HandleUntyped) -> Option<Handle<T>> where T: 'static {
+        if TypeId::of::<T>() == untyped_handle.type_id {
+            Some(Handle::new(untyped_handle.id))
+        } else {
+            None
+        }
+    }
 }
 
 impl<T> Hash for Handle<T> {
@@ -88,11 +96,7 @@ where
     T: 'static,
 {
     fn from(handle: HandleUntyped) -> Self {
-        if TypeId::of::<T>() != handle.type_id {
-            panic!("attempted to convert untyped handle to incorrect typed handle");
-        }
-
-        Handle::new(handle.id)
+        Handle::from_untyped(handle).expect("attempted to convert untyped handle to incorrect typed handle")
     }
 }
 

src/render/render_resource/batching/batch.rs

@@ -1,4 +1,7 @@
-use crate::{asset::HandleUntyped, render::render_resource::RenderResourceAssignments};
+use crate::{
+    asset::{Handle, HandleUntyped},
+    render::render_resource::RenderResourceAssignments,
+};
 use legion::prelude::Entity;
 use std::collections::{HashMap, HashSet};
 
@@ -23,4 +26,12 @@ impl Batch {
             self.current_instanced_entity_index += 1;
         }
     }
+
+    pub fn get_handle<T>(&self) -> Option<Handle<T>> where T: 'static {
+        self.handles
+            .iter()
+            .map(|h| Handle::from_untyped(*h))
+            .find(|h| h.is_some())
+            .map(|h| h.unwrap())
+    }
 }