1 files changed, 81 insertions, 0 deletions
diff --git a/dom/vr/XRSpace.cpp b/dom/vr/XRSpace.cpp
new file mode 100644
index 0000000000..1f6449e870
--- /dev/null
+++ b/dom/vr/XRSpace.cpp
@@ -0,0 +1,81 @@
+/* -*- 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 "mozilla/dom/XRSpace.h"
+#include "mozilla/dom/XRRigidTransform.h"
+#include "VRDisplayClient.h"
+
+namespace mozilla::dom {
+
+NS_IMPL_CYCLE_COLLECTION_CLASS(XRSpace)
+
+NS_IMPL_CYCLE_COLLECTION_TRAVERSE_BEGIN_INHERITED(XRSpace, DOMEventTargetHelper)
+  NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mSession)
+NS_IMPL_CYCLE_COLLECTION_TRAVERSE_END
+
+NS_IMPL_CYCLE_COLLECTION_UNLINK_BEGIN_INHERITED(XRSpace, DOMEventTargetHelper)
+  NS_IMPL_CYCLE_COLLECTION_UNLINK(mSession)
+  // Don't need NS_IMPL_CYCLE_COLLECTION_UNLINK_PRESERVED_WRAPPER because
+  // DOMEventTargetHelper does it for us.
+NS_IMPL_CYCLE_COLLECTION_UNLINK_END
+
+NS_IMPL_ISUPPORTS_CYCLE_COLLECTION_INHERITED_0(XRSpace, DOMEventTargetHelper)
+
+XRSpace::XRSpace(nsIGlobalObject* aParent, XRSession* aSession,
+                 XRNativeOrigin* aNativeOrigin)
+    : DOMEventTargetHelper(aParent),
+      mSession(aSession),
+      mNativeOrigin(aNativeOrigin),
+      mOriginOffsetPosition(0.0f, 0.0f, 0.0f),
+      mOriginOffsetOrientation(0.0f, 0.0f, 0.0f, 1.0f) {}
+
+JSObject* XRSpace::WrapObject(JSContext* aCx,
+                              JS::Handle<JSObject*> aGivenProto) {
+  return XRSpace_Binding::Wrap(aCx, this, aGivenProto);
+}
+
+XRSession* XRSpace::GetSession() const { return mSession; }
+
+gfx::QuaternionDouble XRSpace::GetEffectiveOriginOrientation() const {
+  gfx::QuaternionDouble orientation =
+      mNativeOrigin->GetOrientation() * mOriginOffsetOrientation;
+  return orientation;
+}
+
+gfx::PointDouble3D XRSpace::GetEffectiveOriginPosition() const {
+  gfx::PointDouble3D position;
+  position = mNativeOrigin->GetPosition();
+  position = mOriginOffsetOrientation.RotatePoint(position);
+  position += mOriginOffsetPosition;
+  return position;
+}
+
+gfx::Matrix4x4Double XRSpace::GetEffectiveOriginTransform() const {
+  gfx::Matrix4x4Double transform;
+  transform.SetRotationFromQuaternion(GetEffectiveOriginOrientation());
+  transform.PostTranslate(GetEffectiveOriginPosition());
+  return transform;
+}
+
+bool XRSpace::IsPositionEmulated() const {
+  gfx::VRDisplayClient* display = mSession->GetDisplayClient();
+  if (!display) {
+    // When there are no sensors, the position is considered emulated.
+    return true;
+  }
+  const gfx::VRDisplayInfo& displayInfo = display->GetDisplayInfo();
+  if (displayInfo.GetCapabilities() &
+      gfx::VRDisplayCapabilityFlags::Cap_PositionEmulated) {
+    // Cap_PositionEmulated indicates that the position is always emulated.
+    return true;
+  }
+  const gfx::VRHMDSensorState& sensorState = display->GetSensorState();
+  // When positional tracking is lost, the position is considered emulated.
+  return ((sensorState.flags & gfx::VRDisplayCapabilityFlags::Cap_Position) ==
+          gfx::VRDisplayCapabilityFlags::Cap_None);
+}
+
+}  // namespace mozilla::dom