Use initialized input sources in getInputSources()

components/script/dom/vrdisplay.rs

@@ -926,7 +926,7 @@ impl VRDisplay {
     /// Initialize XRInputSources
     fn initialize_inputs(&self) {
         if self.initialized_inputs.get() {
-            return
+            return;
         }
         self.initialized_inputs.set(true);
 
@@ -955,6 +955,15 @@ impl VRDisplay {
             Err(_) => {},
         }
     }
+
+    pub fn get_input_sources(&self) -> Vec<DomRoot<XRInputSource>> {
+        self.initialize_inputs();
+        self.input_sources
+            .borrow()
+            .iter()
+            .map(|(_, x)| DomRoot::from_ref(&**x))
+            .collect()
+    }
 }
 
 // WebVR Spec: If the number of values in the leftBounds/rightBounds arrays

components/script/dom/webidls/XRSession.webidl

@@ -25,7 +25,10 @@ interface XRSession : EventTarget {
   // // Methods
   Promise<XRReferenceSpace> requestReferenceSpace(XRReferenceSpaceOptions options);
 
+  // workaround until we have FrozenArray
+  // see https://github.com/servo/servo/issues/10427#issuecomment-449593626
   // FrozenArray<XRInputSource> getInputSources();
+  sequence<XRInputSource> getInputSources();
 
   Promise<void> updateRenderState(optional XRRenderStateInit state);
   long requestAnimationFrame(XRFrameRequestCallback callback);

components/script/dom/xrsession.rs

@@ -19,6 +19,7 @@ use crate::dom::eventtarget::EventTarget;
 use crate::dom::globalscope::GlobalScope;
 use crate::dom::promise::Promise;
 use crate::dom::vrdisplay::VRDisplay;
+use crate::dom::xrinputsource::XRInputSource;
 use crate::dom::xrlayer::XRLayer;
 use crate::dom::xrreferencespace::XRReferenceSpace;
 use crate::dom::xrrenderstate::XRRenderState;
@@ -153,4 +154,9 @@ impl XRSessionMethods for XRSession {
 
         p
     }
+
+    /// https://immersive-web.github.io/webxr/#dom-xrsession-getinputsources
+    fn GetInputSources(&self) -> Vec<DomRoot<XRInputSource>> {
+        self.display.get_input_sources()
+    }
 }