1 files changed, 83 insertions, 0 deletions
diff --git a/components/script/dom/webxr/xrjointspace.rs b/components/script/dom/webxr/xrjointspace.rs
new file mode 100644
index 00000000000..8d8dc9309f7
--- /dev/null
+++ b/components/script/dom/webxr/xrjointspace.rs
@@ -0,0 +1,83 @@
+/* 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, InputId, Joint, JointFrame, Space};
+
+use crate::dom::bindings::codegen::Bindings::XRHandBinding::XRHandJoint;
+use crate::dom::bindings::codegen::Bindings::XRJointSpaceBinding::XRJointSpaceMethods;
+use crate::dom::bindings::reflector::reflect_dom_object;
+use crate::dom::bindings::root::DomRoot;
+use crate::dom::globalscope::GlobalScope;
+use crate::dom::xrsession::{ApiPose, XRSession};
+use crate::dom::xrspace::XRSpace;
+
+#[dom_struct]
+pub struct XRJointSpace {
+    xrspace: XRSpace,
+    #[ignore_malloc_size_of = "defined in rust-webxr"]
+    #[no_trace]
+    input: InputId,
+    #[ignore_malloc_size_of = "defined in rust-webxr"]
+    #[no_trace]
+    joint: Joint,
+    hand_joint: XRHandJoint,
+}
+
+impl XRJointSpace {
+    pub fn new_inherited(
+        session: &XRSession,
+        input: InputId,
+        joint: Joint,
+        hand_joint: XRHandJoint,
+    ) -> XRJointSpace {
+        XRJointSpace {
+            xrspace: XRSpace::new_inherited(session),
+            input,
+            joint,
+            hand_joint,
+        }
+    }
+
+    #[allow(unused)]
+    pub fn new(
+        global: &GlobalScope,
+        session: &XRSession,
+        input: InputId,
+        joint: Joint,
+        hand_joint: XRHandJoint,
+    ) -> DomRoot<XRJointSpace> {
+        reflect_dom_object(
+            Box::new(Self::new_inherited(session, input, joint, hand_joint)),
+            global,
+        )
+    }
+
+    pub fn space(&self) -> Space {
+        let base = BaseSpace::Joint(self.input, self.joint);
+        let offset = RigidTransform3D::identity();
+        Space { base, offset }
+    }
+
+    pub fn frame<'a>(&self, frame: &'a Frame) -> Option<&'a JointFrame> {
+        frame
+            .inputs
+            .iter()
+            .find(|i| i.id == self.input)
+            .and_then(|i| i.hand.as_ref())
+            .and_then(|h| h.get(self.joint))
+    }
+
+    pub fn get_pose(&self, frame: &Frame) -> Option<ApiPose> {
+        self.frame(frame).map(|f| f.pose).map(|t| t.cast_unit())
+    }
+}
+
+impl XRJointSpaceMethods<crate::DomTypeHolder> for XRJointSpace {
+    /// <https://www.w3.org/TR/webxr-hand-input-1/#xrjointspace-jointname>
+    fn JointName(&self) -> XRHandJoint {
+        self.hand_joint
+    }
+}