1 files changed, 34 insertions, 0 deletions
diff --git a/dom/vr/XRNativeOriginLocal.cpp b/dom/vr/XRNativeOriginLocal.cpp
new file mode 100644
index 0000000000..fd4590cf9e
--- /dev/null
+++ b/dom/vr/XRNativeOriginLocal.cpp
@@ -0,0 +1,34 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* 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 http://mozilla.org/MPL/2.0/. */
+
+#include "XRNativeOriginLocal.h"
+#include "VRDisplayClient.h"
+
+namespace mozilla::dom {
+
+XRNativeOriginLocal::XRNativeOriginLocal(gfx::VRDisplayClient* aDisplay)
+    : mDisplay(aDisplay), mInitialPositionValid(false) {
+  MOZ_ASSERT(aDisplay);
+}
+
+gfx::PointDouble3D XRNativeOriginLocal::GetPosition() {
+  // Keep returning {0,0,0} until a position can be found
+  if (!mInitialPositionValid) {
+    const gfx::VRHMDSensorState& sensorState = mDisplay->GetSensorState();
+    gfx::PointDouble3D origin;
+    if (sensorState.flags & gfx::VRDisplayCapabilityFlags::Cap_Position ||
+        sensorState.flags &
+            gfx::VRDisplayCapabilityFlags::Cap_PositionEmulated) {
+      mInitialPosition.x = sensorState.pose.position[0];
+      mInitialPosition.y = sensorState.pose.position[1];
+      mInitialPosition.z = sensorState.pose.position[2];
+      mInitialPositionValid = true;
+    }
+  }
+  return mInitialPosition;
+}
+
+}  // namespace mozilla::dom