Add GetGamepadsForDisplay message for initializing inputs

components/webvr/webvr_thread.rs

@@ -128,6 +128,9 @@ impl WebVRThread {
                 WebVRMsg::GetGamepads(synced_ids, sender) => {
                     self.handle_get_gamepads(synced_ids, sender);
                 },
+                WebVRMsg::GetGamepadsForDisplay(display_id, sender) => {
+                    self.handle_get_gamepads_for_display(display_id, sender);
+                },
                 WebVRMsg::Exit => break,
             }
         }
@@ -251,6 +254,32 @@ impl WebVRThread {
         self.vr_compositor_chan.send(compositor).unwrap();
     }
 
+    fn handle_get_gamepads_for_display(
+        &mut self,
+        display_id: u32,
+        sender: IpcSender<WebVRResult<Vec<(VRGamepadData, VRGamepadState)>>>,
+    ) {
+        match self.service.get_display(display_id) {
+            Some(display) => {
+                let gamepads = display.borrow_mut().fetch_gamepads();
+                match gamepads {
+                    Ok(gamepads) => {
+                        let data = gamepads
+                            .iter()
+                            .map(|g| {
+                                let g = g.borrow();
+                                (g.data(), g.state())
+                            })
+                            .collect();
+                        sender.send(Ok(data)).unwrap();
+                    },
+                    Err(e) => sender.send(Err(e)).unwrap(),
+                }
+            },
+            None => sender.send(Err("Device not found".into())).unwrap(),
+        }
+    }
+
     fn handle_get_gamepads(
         &mut self,
         synced_ids: Vec<u32>,

components/webvr_traits/webvr_traits.rs

@@ -30,5 +30,9 @@ pub enum WebVRMsg {
         Vec<u32>,
         IpcSender<WebVRResult<Vec<(Option<VRGamepadData>, VRGamepadState)>>>,
     ),
+    GetGamepadsForDisplay(
+        u32,
+        IpcSender<WebVRResult<Vec<(VRGamepadData, VRGamepadState)>>>,
+    ),
     Exit,
 }