Added first-cut implementation of XR layers

components/script/dom/xrlayer.rs

@@ -0,0 +1,53 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * 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::XRLayerBinding::XRLayerBinding::XRLayerMethods;
+use crate::dom::bindings::reflector::Reflector;
+use crate::dom::bindings::root::Dom;
+use crate::dom::webglrenderingcontext::WebGLRenderingContext;
+use crate::dom::xrsession::XRSession;
+use dom_struct::dom_struct;
+use euclid::Size2D;
+use webxr_api::Viewport;
+
+#[dom_struct]
+pub struct XRLayer {
+    reflector: Reflector,
+    session: Dom<XRSession>,
+    context: Dom<WebGLRenderingContext>,
+    size: Size2D<u32, Viewport>,
+}
+
+impl XRLayerMethods for XRLayer {
+    /// https://immersive-web.github.io/layers/#dom-xrlayer-pixelwidth
+    fn PixelWidth(&self) -> u32 {
+        self.size.width
+    }
+
+    /// https://immersive-web.github.io/layers/#dom-xrlayer-pixelheight
+    fn PixelHeight(&self) -> u32 {
+        self.size.height
+    }
+
+    /// https://immersive-web.github.io/layers/#dom-xrlayer-destroy
+    fn Destroy(&self) {
+        // TODO: Implement this
+    }
+}
+
+impl XRLayer {
+    #[allow(dead_code)]
+    pub fn new_inherited(
+        session: &XRSession,
+        context: &WebGLRenderingContext,
+        size: Size2D<u32, Viewport>,
+    ) -> XRLayer {
+        XRLayer {
+            reflector: Reflector::new(),
+            session: Dom::from_ref(session),
+            context: Dom::from_ref(context),
+            size: size,
+        }
+    }
+}