dom/vr/XRReferenceSpace.cpp

   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/XRReferenceSpace.h"
   8 #include "mozilla/dom/XRRigidTransform.h"
   9 #include "VRDisplayClient.h"
  10
  11 namespace mozilla::dom {
  12
  13 XRReferenceSpace::XRReferenceSpace(nsIGlobalObject* aParent,
  14                                    XRSession* aSession,
  15                                    XRNativeOrigin* aNativeOrigin,
  16                                    XRReferenceSpaceType aType)
  17     : XRSpace(aParent, aSession, aNativeOrigin), mType(aType) {}
  18
  19 already_AddRefed<XRReferenceSpace> XRReferenceSpace::GetOffsetReferenceSpace(
  20     const XRRigidTransform& aOriginOffset) {
  21   RefPtr<XRReferenceSpace> offsetReferenceSpace =
  22       new XRReferenceSpace(GetParentObject(), mSession, mNativeOrigin, mType);
  23
  24   // https://immersive-web.github.io/webxr/#multiply-transforms
  25   // An XRRigidTransform is essentially a rotation followed by a translation
  26   gfx::QuaternionDouble otherOrientation = aOriginOffset.RawOrientation();
  27   // The resulting rotation is the two combined
  28   offsetReferenceSpace->mOriginOffsetOrientation =
  29       mOriginOffsetOrientation * otherOrientation;
  30   // We first apply the rotation of aOriginOffset to
  31   // mOriginOffsetPosition offset, then translate by the offset of
  32   // aOriginOffset
  33   offsetReferenceSpace->mOriginOffsetPosition =
  34       otherOrientation.RotatePoint(mOriginOffsetPosition) +
  35       aOriginOffset.RawPosition();
  36
  37   return offsetReferenceSpace.forget();
  38 }
  39
  40 JSObject* XRReferenceSpace::WrapObject(JSContext* aCx,
  41                                        JS::Handle<JSObject*> aGivenProto) {
  42   return XRReferenceSpace_Binding::Wrap(aCx, this, aGivenProto);
  43 }
  44
  45 }  // namespace mozilla::dom