Add a dummy implementation of all the XR Layer types

components/script/dom/xrmediabinding.rs

@@ -2,11 +2,19 @@
  * License, v. 2.0. If a copy of the MPL was not distributed with this
  * file, You can obtain one at https://mozilla.org/MPL/2.0/. */
 
+use crate::dom::bindings::codegen::Bindings::XRMediaBindingBinding::XRMediaBindingBinding::XRMediaBindingMethods;
+use crate::dom::bindings::codegen::Bindings::XRMediaBindingBinding::XRMediaLayerInit;
+use crate::dom::bindings::error::Error;
+use crate::dom::bindings::error::Fallible;
 use crate::dom::bindings::reflector::reflect_dom_object;
 use crate::dom::bindings::reflector::Reflector;
 use crate::dom::bindings::root::Dom;
 use crate::dom::bindings::root::DomRoot;
+use crate::dom::htmlvideoelement::HTMLVideoElement;
 use crate::dom::window::Window;
+use crate::dom::xrcylinderlayer::XRCylinderLayer;
+use crate::dom::xrequirectlayer::XREquirectLayer;
+use crate::dom::xrquadlayer::XRQuadLayer;
 use crate::dom::xrsession::XRSession;
 use dom_struct::dom_struct;
 
@@ -29,7 +37,50 @@ impl XRMediaBinding {
     }
 
     #[allow(non_snake_case)]
-    pub fn Constructor(global: &Window, session: &XRSession) -> DomRoot<XRMediaBinding> {
-        XRMediaBinding::new(global, session)
+    pub fn Constructor(global: &Window, session: &XRSession) -> Fallible<DomRoot<XRMediaBinding>> {
+        // Step 1.
+        if session.is_ended() {
+            return Err(Error::InvalidState);
+        }
+
+        // Step 2.
+        if !session.is_immersive() {
+            return Err(Error::InvalidState);
+        }
+
+        // Steps 3-5.
+        Ok(XRMediaBinding::new(global, session))
+    }
+}
+
+impl XRMediaBindingMethods for XRMediaBinding {
+    /// https://immersive-web.github.io/layers/#dom-xrmediabinding-createquadlayer
+    fn CreateQuadLayer(
+        &self,
+        _: &HTMLVideoElement,
+        _: &XRMediaLayerInit,
+    ) -> Fallible<DomRoot<XRQuadLayer>> {
+        // https://github.com/servo/servo/issues/27493
+        Err(Error::NotSupported)
+    }
+
+    /// https://immersive-web.github.io/layers/#dom-xrmediabinding-createcylinderlayer
+    fn CreateCylinderLayer(
+        &self,
+        _: &HTMLVideoElement,
+        _: &XRMediaLayerInit,
+    ) -> Fallible<DomRoot<XRCylinderLayer>> {
+        // https://github.com/servo/servo/issues/27493
+        Err(Error::NotSupported)
+    }
+
+    /// https://immersive-web.github.io/layers/#dom-xrmediabinding-createequirectlayer
+    fn CreateEquirectLayer(
+        &self,
+        _: &HTMLVideoElement,
+        _: &XRMediaLayerInit,
+    ) -> Fallible<DomRoot<XREquirectLayer>> {
+        // https://github.com/servo/servo/issues/27493
+        Err(Error::NotSupported)
     }
 }