Add XRHand[index]

components/script/dom/webidls/XRHand.webidl

@@ -6,5 +6,36 @@
 
 [SecureContext, Exposed=Window, Pref="dom.webxr.hands.enabled"]
 interface XRHand {
-//    getter XRJoint(unsigned short jointIndex);
+    readonly attribute long length;
+    getter XRJointSpace(unsigned long index);
+
+    const unsigned long WRIST = 0;
+    const unsigned long THUMB_METACARPAL = 1;
+    const unsigned long THUMB_PHALANX_PROXIMAL = 2;
+    const unsigned long THUMB_PHALANX_DISTAL = 3;
+    const unsigned long THUMB_PHALANX_TIP = 4;
+
+    const unsigned long INDEX_METACARPAL = 5;
+    const unsigned long INDEX_PHALANX_PROXIMAL = 6;
+    const unsigned long INDEX_PHALANX_INTERMEDIATE = 7;
+    const unsigned long INDEX_PHALANX_DISTAL = 8;
+    const unsigned long INDEX_PHALANX_TIP = 9;
+
+    const unsigned long MIDDLE_METACARPAL = 10;
+    const unsigned long MIDDLE_PHALANX_PROXIMAL = 11;
+    const unsigned long MIDDLE_PHALANX_INTERMEDIATE = 12;
+    const unsigned long MIDDLE_PHALANX_DISTAL = 13;
+    const unsigned long MIDDLE_PHALANX_TIP = 14;
+
+    const unsigned long RING_METACARPAL = 15;
+    const unsigned long RING_PHALANX_PROXIMAL = 16;
+    const unsigned long RING_PHALANX_INTERMEDIATE = 17;
+    const unsigned long RING_PHALANX_DISTAL = 18;
+    const unsigned long RING_PHALANX_TIP = 19;
+
+    const unsigned long LITTLE_METACARPAL = 20;
+    const unsigned long LITTLE_PHALANX_PROXIMAL = 21;
+    const unsigned long LITTLE_PHALANX_INTERMEDIATE = 22;
+    const unsigned long LITTLE_PHALANX_DISTAL = 23;
+    const unsigned long LITTLE_PHALANX_TIP = 24;
 };

components/script/dom/xrhand.rs

@@ -2,12 +2,14 @@
  * 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::XRHandBinding::{XRHandConstants, XRHandMethods};
 use crate::dom::bindings::reflector::{reflect_dom_object, Reflector};
 use crate::dom::bindings::root::{Dom, DomRoot};
 use crate::dom::globalscope::GlobalScope;
 use crate::dom::xrinputsource::XRInputSource;
+use crate::dom::xrjointspace::XRJointSpace;
 use dom_struct::dom_struct;
-use webxr_api::Hand;
+use webxr_api::{FingerJoint, Hand, Joint};
 
 #[dom_struct]
 pub struct XRHand {
@@ -15,19 +17,72 @@ pub struct XRHand {
     #[ignore_malloc_size_of = "defined in webxr"]
     source: Dom<XRInputSource>,
     #[ignore_malloc_size_of = "partially defind in webxr"]
-    support: Hand<()>,
+    spaces: Hand<Dom<XRJointSpace>>,
 }
 
 impl XRHand {
-    fn new_inherited(source: &XRInputSource, support: Hand<()>) -> XRHand {
+    fn new_inherited(source: &XRInputSource, spaces: &Hand<DomRoot<XRJointSpace>>) -> XRHand {
         XRHand {
             reflector_: Reflector::new(),
             source: Dom::from_ref(source),
-            support,
+            spaces: spaces.map(|j, _| j.as_ref().map(|j| Dom::from_ref(&**j))),
         }
     }
 
     pub fn new(global: &GlobalScope, source: &XRInputSource, support: Hand<()>) -> DomRoot<XRHand> {
-        reflect_dom_object(Box::new(XRHand::new_inherited(source, support)), global)
+        let id = source.id();
+        let session = source.session();
+        let spaces = support
+            .map(|field, joint| field.map(|_| XRJointSpace::new(global, session, id, joint)));
+        reflect_dom_object(Box::new(XRHand::new_inherited(source, &spaces)), global)
+    }
+}
+
+impl XRHandMethods for XRHand {
+    /// https://github.com/immersive-web/webxr-hands-input/blob/master/explainer.md
+    fn Length(&self) -> i32 {
+        XRHandConstants::LITTLE_PHALANX_TIP as i32 + 1
+    }
+
+    /// https://github.com/immersive-web/webxr-hands-input/blob/master/explainer.md
+    fn IndexedGetter(&self, joint_index: u32) -> Option<DomRoot<XRJointSpace>> {
+        let joint = match joint_index {
+            XRHandConstants::WRIST => Joint::Wrist,
+            XRHandConstants::THUMB_METACARPAL => Joint::ThumbMetacarpal,
+            XRHandConstants::THUMB_PHALANX_PROXIMAL => Joint::ThumbPhalanxProximal,
+            XRHandConstants::THUMB_PHALANX_DISTAL => Joint::ThumbPhalanxDistal,
+            XRHandConstants::THUMB_PHALANX_TIP => Joint::ThumbPhalanxTip,
+            XRHandConstants::INDEX_METACARPAL => Joint::Index(FingerJoint::Metacarpal),
+            XRHandConstants::INDEX_PHALANX_PROXIMAL => Joint::Index(FingerJoint::PhalanxProximal),
+            XRHandConstants::INDEX_PHALANX_INTERMEDIATE => {
+                Joint::Index(FingerJoint::PhalanxIntermediate)
+            },
+            XRHandConstants::INDEX_PHALANX_DISTAL => Joint::Index(FingerJoint::PhalanxDistal),
+            XRHandConstants::INDEX_PHALANX_TIP => Joint::Index(FingerJoint::PhalanxTip),
+            XRHandConstants::MIDDLE_METACARPAL => Joint::Middle(FingerJoint::Metacarpal),
+            XRHandConstants::MIDDLE_PHALANX_PROXIMAL => Joint::Middle(FingerJoint::PhalanxProximal),
+            XRHandConstants::MIDDLE_PHALANX_INTERMEDIATE => {
+                Joint::Middle(FingerJoint::PhalanxIntermediate)
+            },
+            XRHandConstants::MIDDLE_PHALANX_DISTAL => Joint::Middle(FingerJoint::PhalanxDistal),
+            XRHandConstants::MIDDLE_PHALANX_TIP => Joint::Middle(FingerJoint::PhalanxTip),
+            XRHandConstants::RING_METACARPAL => Joint::Ring(FingerJoint::Metacarpal),
+            XRHandConstants::RING_PHALANX_PROXIMAL => Joint::Ring(FingerJoint::PhalanxProximal),
+            XRHandConstants::RING_PHALANX_INTERMEDIATE => {
+                Joint::Ring(FingerJoint::PhalanxIntermediate)
+            },
+            XRHandConstants::RING_PHALANX_DISTAL => Joint::Ring(FingerJoint::PhalanxDistal),
+            XRHandConstants::RING_PHALANX_TIP => Joint::Ring(FingerJoint::PhalanxTip),
+            XRHandConstants::LITTLE_METACARPAL => Joint::Little(FingerJoint::Metacarpal),
+            XRHandConstants::LITTLE_PHALANX_PROXIMAL => Joint::Little(FingerJoint::PhalanxProximal),
+            XRHandConstants::LITTLE_PHALANX_INTERMEDIATE => {
+                Joint::Little(FingerJoint::PhalanxIntermediate)
+            },
+            XRHandConstants::LITTLE_PHALANX_DISTAL => Joint::Little(FingerJoint::PhalanxDistal),
+            XRHandConstants::LITTLE_PHALANX_TIP => Joint::Little(FingerJoint::PhalanxTip),
+            // XXXManishearth should this be a TypeError?
+            _ => return None,
+        };
+        self.spaces.get(joint).map(|j| DomRoot::from_ref(&**j))
     }
 }

components/script/dom/xrinputsource.rs

@@ -69,6 +69,10 @@ impl XRInputSource {
     pub fn id(&self) -> InputId {
         self.info.id
     }
+
+    pub fn session(&self) -> &XRSession {
+        &self.session
+    }
 }
 
 impl XRInputSourceMethods for XRInputSource {