metal: check if in the main thread when calling create_surface

gfx-rs · Jun 6, 2022 · f5cb4d8 · f5cb4d8
1 parent a3b2418
commit f5cb4d8
Showing 1 changed file with 6 additions and 1 deletion.
diff --git a/wgpu-hal/src/metal/surface.rs b/wgpu-hal/src/metal/surface.rs
@@ -9,7 +9,7 @@ use objc::{
     declare::ClassDecl,
     msg_send,
     rc::autoreleasepool,
-    runtime::{Class, Object, Sel, BOOL, YES},
+    runtime::{Class, Object, Sel, BOOL, NO, YES},
     sel, sel_impl,
 };
 use parking_lot::Mutex;
@@ -84,6 +84,11 @@ impl super::Surface {
             panic!("window does not have a valid contentView");
         }
 
+        let is_main_thread: BOOL = msg_send![class!(NSThread), isMainThread];
+        if is_main_thread == NO {
+            panic!("create_surface cannot be called in non-ui thread.");
+        }
+
         let main_layer: *mut Object = msg_send![view, layer];
         let class = class!(CAMetalLayer);
         let is_valid_layer: BOOL = msg_send![main_layer, isKindOfClass: class];