Added first-cut implementation of XR layers

components/script/dom/xrwebglbinding.rs

@@ -0,0 +1,109 @@
+/* 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::XRWebGLBindingBinding::XRWebGLBindingBinding::XRWebGLBindingMethods;
+use crate::dom::bindings::codegen::UnionTypes::WebGLRenderingContextOrWebGL2RenderingContext as RootedWebGLRenderingContextOrWebGL2RenderingContext;
+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::webgl2renderingcontext::WebGL2RenderingContext;
+use crate::dom::webglrenderingcontext::WebGLRenderingContext;
+use crate::dom::window::Window;
+use crate::dom::xrframe::XRFrame;
+use crate::dom::xrlayer::XRLayer;
+use crate::dom::xrsession::XRSession;
+use crate::dom::xrview::XRView;
+use crate::dom::xrwebglsubimage::XRWebGLSubImage;
+use dom_struct::dom_struct;
+
+#[dom_struct]
+pub struct XRWebGLBinding {
+    reflector: Reflector,
+    session: Dom<XRSession>,
+    context: WebGLRenderingContextOrWebGL2RenderingContext,
+}
+
+// TODO: Should this live somewhere else?
+#[unrooted_must_root_lint::must_root]
+#[derive(Clone, JSTraceable, MallocSizeOf)]
+pub enum WebGLRenderingContextOrWebGL2RenderingContext {
+    WebGLRenderingContext(Dom<WebGLRenderingContext>),
+    WebGL2RenderingContext(Dom<WebGL2RenderingContext>),
+}
+
+impl WebGLRenderingContextOrWebGL2RenderingContext {
+    #[allow(unrooted_must_root)]
+    fn from_ref(
+        context: &RootedWebGLRenderingContextOrWebGL2RenderingContext,
+    ) -> WebGLRenderingContextOrWebGL2RenderingContext {
+        match context {
+            RootedWebGLRenderingContextOrWebGL2RenderingContext::WebGLRenderingContext(
+                ref context,
+            ) => WebGLRenderingContextOrWebGL2RenderingContext::WebGLRenderingContext(
+                Dom::from_ref(context),
+            ),
+            RootedWebGLRenderingContextOrWebGL2RenderingContext::WebGL2RenderingContext(
+                ref context,
+            ) => WebGLRenderingContextOrWebGL2RenderingContext::WebGL2RenderingContext(
+                Dom::from_ref(context),
+            ),
+        }
+    }
+}
+
+impl XRWebGLBindingMethods for XRWebGLBinding {
+    /// https://immersive-web.github.io/layers/#dom-xrwebglbinding-getsubimage
+    fn GetSubImage(&self, _layer: &XRLayer, _frame: &XRFrame) -> Option<DomRoot<XRWebGLSubImage>> {
+        // TODO: Implement this
+        None
+    }
+
+    /// https://immersive-web.github.io/layers/#dom-xrwebglbinding-getviewsubimage
+    fn GetViewSubImage(
+        &self,
+        _layer: &XRLayer,
+        _view: &XRView,
+    ) -> Option<DomRoot<XRWebGLSubImage>> {
+        // TODO: Implement this
+        None
+    }
+}
+
+impl XRWebGLBinding {
+    pub fn new_inherited(
+        session: &XRSession,
+        context: &WebGLRenderingContextOrWebGL2RenderingContext,
+    ) -> XRWebGLBinding {
+        XRWebGLBinding {
+            reflector: Reflector::new(),
+            session: Dom::from_ref(session),
+            context: context.clone(),
+        }
+    }
+
+    pub fn new(
+        global: &Window,
+        session: &XRSession,
+        context: &WebGLRenderingContextOrWebGL2RenderingContext,
+    ) -> DomRoot<XRWebGLBinding> {
+        reflect_dom_object(
+            Box::new(XRWebGLBinding::new_inherited(session, context)),
+            global,
+        )
+    }
+
+    #[allow(non_snake_case)]
+    pub fn Constructor(
+        global: &Window,
+        session: &XRSession,
+        context: RootedWebGLRenderingContextOrWebGL2RenderingContext,
+    ) -> DomRoot<XRWebGLBinding> {
+        XRWebGLBinding::new(
+            global,
+            session,
+            &WebGLRenderingContextOrWebGL2RenderingContext::from_ref(&context),
+        )
+    }
+}