Filter out webidl files based on special comments, and feature-gate webxr interfaces. (#34348)

* Filter out webidl files based on skip-if directives.

Signed-off-by: Josh Matthews <josh@joshmatthews.net>

* script: Don't build XR functionality without webxr feature.

Signed-off-by: Josh Matthews <josh@joshmatthews.net>

* Fix tidy.

Signed-off-by: Josh Matthews <josh@joshmatthews.net>

* script: Adjust imports for file movement.

Signed-off-by: Josh Matthews <josh@joshmatthews.net>

* Fix clippy.

Signed-off-by: Josh Matthews <josh@joshmatthews.net>

* Formatting.

Signed-off-by: Josh Matthews <josh@joshmatthews.net>

* Clean up webxr module import.

Co-authored-by: Samson <16504129+sagudev@users.noreply.github.com>
Signed-off-by: Josh Matthews <josh@joshmatthews.net>

---------

Signed-off-by: Josh Matthews <josh@joshmatthews.net>
Co-authored-by: Samson <16504129+sagudev@users.noreply.github.com>

components/script/dom/webxr/xrspace.rs

@@ -0,0 +1,120 @@
+/* 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 dom_struct::dom_struct;
+use euclid::RigidTransform3D;
+use webxr_api::{BaseSpace, Frame, Space};
+
+use crate::dom::bindings::inheritance::Castable;
+use crate::dom::bindings::reflector::reflect_dom_object;
+use crate::dom::bindings::root::{Dom, DomRoot, MutNullableDom};
+use crate::dom::eventtarget::EventTarget;
+use crate::dom::globalscope::GlobalScope;
+use crate::dom::xrinputsource::XRInputSource;
+use crate::dom::xrjointspace::XRJointSpace;
+use crate::dom::xrreferencespace::XRReferenceSpace;
+use crate::dom::xrsession::{cast_transform, ApiPose, XRSession};
+
+#[dom_struct]
+pub struct XRSpace {
+    eventtarget: EventTarget,
+    session: Dom<XRSession>,
+    input_source: MutNullableDom<XRInputSource>,
+    /// If we're an input space, are we an aim space or a grip space?
+    is_grip_space: bool,
+}
+
+impl XRSpace {
+    pub fn new_inherited(session: &XRSession) -> XRSpace {
+        XRSpace {
+            eventtarget: EventTarget::new_inherited(),
+            session: Dom::from_ref(session),
+            input_source: Default::default(),
+            is_grip_space: false,
+        }
+    }
+
+    fn new_inputspace_inner(
+        session: &XRSession,
+        input: &XRInputSource,
+        is_grip_space: bool,
+    ) -> XRSpace {
+        XRSpace {
+            eventtarget: EventTarget::new_inherited(),
+            session: Dom::from_ref(session),
+            input_source: MutNullableDom::new(Some(input)),
+            is_grip_space,
+        }
+    }
+
+    pub fn new_inputspace(
+        global: &GlobalScope,
+        session: &XRSession,
+        input: &XRInputSource,
+        is_grip_space: bool,
+    ) -> DomRoot<XRSpace> {
+        reflect_dom_object(
+            Box::new(XRSpace::new_inputspace_inner(session, input, is_grip_space)),
+            global,
+        )
+    }
+
+    pub fn space(&self) -> Space {
+        if let Some(rs) = self.downcast::<XRReferenceSpace>() {
+            rs.space()
+        } else if let Some(j) = self.downcast::<XRJointSpace>() {
+            j.space()
+        } else if let Some(source) = self.input_source.get() {
+            let base = if self.is_grip_space {
+                BaseSpace::Grip(source.id())
+            } else {
+                BaseSpace::TargetRay(source.id())
+            };
+            Space {
+                base,
+                offset: RigidTransform3D::identity(),
+            }
+        } else {
+            panic!("invalid space found")
+        }
+    }
+}
+
+impl XRSpace {
+    /// Gets pose represented by this space
+    ///
+    /// The reference origin used is common between all
+    /// get_pose calls for spaces from the same device, so this can be used to compare
+    /// with other spaces
+    pub fn get_pose(&self, base_pose: &Frame) -> Option<ApiPose> {
+        if let Some(reference) = self.downcast::<XRReferenceSpace>() {
+            reference.get_pose(base_pose)
+        } else if let Some(joint) = self.downcast::<XRJointSpace>() {
+            joint.get_pose(base_pose)
+        } else if let Some(source) = self.input_source.get() {
+            // XXXManishearth we should be able to request frame information
+            // for inputs when necessary instead of always loading it
+            //
+            // Also, the below code is quadratic, so this API may need an overhaul anyway
+            let id = source.id();
+            // XXXManishearth once we have dynamic inputs we'll need to handle this better
+            let frame = base_pose
+                .inputs
+                .iter()
+                .find(|i| i.id == id)
+                .expect("no input found");
+            if self.is_grip_space {
+                frame.grip_origin.map(cast_transform)
+            } else {
+                frame.target_ray_origin.map(cast_transform)
+            }
+        } else {
+            unreachable!()
+        }
+    }
+
+    pub fn session(&self) -> &XRSession {
+        &self.session
+    }
+}