Fully support bind group layout deduplication in Pipeline::get_bind_g…

…roup_layout

wgpu-core/src/binding_model.rs

@@ -473,6 +473,7 @@ pub struct BindGroupLayoutInner<A: hal::Api> {
 }
 
 impl<A: hal::Api> BindGroupLayout<A> {
+    #[track_caller]
     pub(crate) fn assume_deduplicated(&self) -> &BindGroupLayoutInner<A> {
         self.as_inner().unwrap()
     }

wgpu-core/src/device/global.rs

@@ -1924,7 +1924,24 @@ impl<G: GlobalIdentityHandlerFactory> Global<G> {
                 None => break binding_model::GetBindGroupLayoutError::InvalidGroupIndex(index),
             };
 
-            bgl_guard[*id].multi_ref_count.inc();
+            let layout = &bgl_guard[*id];
+            layout.multi_ref_count.inc();
+
+            if G::ids_are_generated_in_wgpu() {
+                return (id.0, None);
+            }
+
+            // The ID is provided externally, so we must create a new bind group layout
+            // with the given ID as a duplicate of the existing one.
+            let new_layout = BindGroupLayout {
+                device_id: layout.device_id.clone(),
+                inner: crate::binding_model::BglOrDuplicate::<A>::Duplicate(*id),
+                multi_ref_count: crate::MultiRefCount::new(),
+            };
+
+            let fid = hub.bind_group_layouts.prepare(id_in);
+            let id = fid.assign(new_layout, &mut Token::root());
+
             return (id.0, None);
         };