tor-browser

The Tor Browser
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XRSpace.cpp (3077B)

      1 /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
      2 /* vim: set ts=8 sts=2 et sw=2 tw=80: */
      3 /* This Source Code Form is subject to the terms of the Mozilla Public
      4 * License, v. 2.0. If a copy of the MPL was not distributed with this file,
      5 * You can obtain one at http://mozilla.org/MPL/2.0/. */
      6 
      7 #include "mozilla/dom/XRSpace.h"
      8 
      9 #include "VRDisplayClient.h"
     10 #include "mozilla/dom/XRRigidTransform.h"
     11 
     12 namespace mozilla::dom {
     13 
     14 NS_IMPL_CYCLE_COLLECTION_CLASS(XRSpace)
     15 
     16 NS_IMPL_CYCLE_COLLECTION_TRAVERSE_BEGIN_INHERITED(XRSpace, DOMEventTargetHelper)
     17  NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mSession)
     18 NS_IMPL_CYCLE_COLLECTION_TRAVERSE_END
     19 
     20 NS_IMPL_CYCLE_COLLECTION_UNLINK_BEGIN_INHERITED(XRSpace, DOMEventTargetHelper)
     21  NS_IMPL_CYCLE_COLLECTION_UNLINK(mSession)
     22  // Don't need NS_IMPL_CYCLE_COLLECTION_UNLINK_PRESERVED_WRAPPER because
     23  // DOMEventTargetHelper does it for us.
     24 NS_IMPL_CYCLE_COLLECTION_UNLINK_END
     25 
     26 NS_IMPL_ISUPPORTS_CYCLE_COLLECTION_INHERITED_0(XRSpace, DOMEventTargetHelper)
     27 
     28 XRSpace::XRSpace(nsIGlobalObject* aParent, XRSession* aSession,
     29                 XRNativeOrigin* aNativeOrigin)
     30    : DOMEventTargetHelper(aParent),
     31      mSession(aSession),
     32      mNativeOrigin(aNativeOrigin),
     33      mOriginOffsetPosition(0.0f, 0.0f, 0.0f),
     34      mOriginOffsetOrientation(0.0f, 0.0f, 0.0f, 1.0f) {}
     35 
     36 JSObject* XRSpace::WrapObject(JSContext* aCx,
     37                              JS::Handle<JSObject*> aGivenProto) {
     38  return XRSpace_Binding::Wrap(aCx, this, aGivenProto);
     39 }
     40 
     41 XRSession* XRSpace::GetSession() const { return mSession; }
     42 
     43 gfx::QuaternionDouble XRSpace::GetEffectiveOriginOrientation() const {
     44  gfx::QuaternionDouble orientation =
     45      mNativeOrigin->GetOrientation() * mOriginOffsetOrientation;
     46  return orientation;
     47 }
     48 
     49 gfx::PointDouble3D XRSpace::GetEffectiveOriginPosition() const {
     50  gfx::PointDouble3D position;
     51  position = mNativeOrigin->GetPosition();
     52  position = mOriginOffsetOrientation.RotatePoint(position);
     53  position += mOriginOffsetPosition;
     54  return position;
     55 }
     56 
     57 gfx::Matrix4x4Double XRSpace::GetEffectiveOriginTransform() const {
     58  gfx::Matrix4x4Double transform;
     59  transform.SetRotationFromQuaternion(GetEffectiveOriginOrientation());
     60  transform.PostTranslate(GetEffectiveOriginPosition());
     61  return transform;
     62 }
     63 
     64 bool XRSpace::IsPositionEmulated() const {
     65  gfx::VRDisplayClient* display = mSession->GetDisplayClient();
     66  if (!display) {
     67    // When there are no sensors, the position is considered emulated.
     68    return true;
     69  }
     70  const gfx::VRDisplayInfo& displayInfo = display->GetDisplayInfo();
     71  if (displayInfo.GetCapabilities() &
     72      gfx::VRDisplayCapabilityFlags::Cap_PositionEmulated) {
     73    // Cap_PositionEmulated indicates that the position is always emulated.
     74    return true;
     75  }
     76  const gfx::VRHMDSensorState& sensorState = display->GetSensorState();
     77  // When positional tracking is lost, the position is considered emulated.
     78  return ((sensorState.flags & gfx::VRDisplayCapabilityFlags::Cap_Position) ==
     79          gfx::VRDisplayCapabilityFlags::Cap_None);
     80 }
     81 
     82 }  // namespace mozilla::dom