From 72403de2096cbd4049dda120e312707c1db8d680 Mon Sep 17 00:00:00 2001
From: bjorn <tie.372@gmail.com>
Date: Wed, 31 Mar 2021 22:37:29 -0600
Subject: [PATCH] webxr: Add support for lovr.headset.getVelocity;

---
 src/resources/webxr.js | 16 +++++++++++++++-
 1 file changed, 15 insertions(+), 1 deletion(-)

diff --git a/src/resources/webxr.js b/src/resources/webxr.js
index 313a0ffc..f6ea53a8 100644
--- a/src/resources/webxr.js
+++ b/src/resources/webxr.js
@@ -273,7 +273,21 @@ var webxr = {
   },
 
   webxr_getVelocity: function(device, velocity, angularVelocity) {
-    return false; // Unsupported, see immersive-web/webxr#619
+    if (state.hands[device]) {
+      var space = state.hands[device].gripSpace || state.hands[device].targetRaySpace;
+      var pose = state.frame.getPose(space, state.space);
+      if (pose && pose.linearVelocity && pose.angularVelocity) {
+        HEAPF32[(velocity >> 2) + 0] = pose.linearVelocity.x;
+        HEAPF32[(velocity >> 2) + 1] = pose.linearVelocity.y;
+        HEAPF32[(velocity >> 2) + 2] = pose.linearVelocity.z;
+        HEAPF32[(angularVelocity >> 2) + 0] = pose.angularVelocity.x;
+        HEAPF32[(angularVelocity >> 2) + 1] = pose.angularVelocity.y;
+        HEAPF32[(angularVelocity >> 2) + 2] = pose.angularVelocity.z;
+        return true;
+      }
+    }
+
+    return false;
   },
 
   webxr_isDown: function(device, button, down, changed) {