dom/vr/XRSpace.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/XRSpace.h"
   8 #include "mozilla/dom/XRRigidTransform.h"
   9 #include "VRDisplayClient.h"
  10
  11 namespace mozilla {
  12 namespace 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 dom
  83 }  // namespace mozilla