dom/vr/XRView.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/XRView.h"
   8
   9 #include "mozilla/HoldDropJSObjects.h"
  10 #include "mozilla/dom/XRRigidTransform.h"
  11 #include "mozilla/dom/Pose.h"
  12 #include "nsWrapperCache.h"
  13
  14 namespace mozilla::dom {
  15
  16 NS_IMPL_CYCLE_COLLECTION_WRAPPERCACHE_WITH_JS_MEMBERS(XRView,
  17                                                       (mParent, mTransform),
  18                                                       (mJSProjectionMatrix))
  19
  20 XRView::XRView(nsISupports* aParent, const XREye& aEye)
  21     : mParent(aParent),
  22       mEye(aEye),
  23
  24       mJSProjectionMatrix(nullptr) {
  25   mozilla::HoldJSObjects(this);
  26 }
  27
  28 XRView::~XRView() { mozilla::DropJSObjects(this); }
  29
  30 JSObject* XRView::WrapObject(JSContext* aCx,
  31                              JS::Handle<JSObject*> aGivenProto) {
  32   return XRView_Binding::Wrap(aCx, this, aGivenProto);
  33 }
  34
  35 void XRView::Update(const gfx::PointDouble3D& aPosition,
  36                     const gfx::QuaternionDouble& aOrientation,
  37                     const gfx::Matrix4x4& aProjectionMatrix) {
  38   mPosition = aPosition;
  39   mOrientation = aOrientation;
  40   mProjectionMatrix = aProjectionMatrix;
  41   if (mTransform) {
  42     mTransform->Update(aPosition, aOrientation);
  43   }
  44   if (aProjectionMatrix != mProjectionMatrix) {
  45     mProjectionNeedsUpdate = true;
  46     mProjectionMatrix = aProjectionMatrix;
  47   }
  48 }
  49
  50 XREye XRView::Eye() const { return mEye; }
  51
  52 void XRView::GetProjectionMatrix(JSContext* aCx,
  53                                  JS::MutableHandle<JSObject*> aRetval,
  54                                  ErrorResult& aRv) {
  55   if (!mJSProjectionMatrix || mProjectionNeedsUpdate) {
  56     mProjectionNeedsUpdate = false;
  57     gfx::Matrix4x4 mat;
  58
  59     Pose::SetFloat32Array(aCx, this, aRetval, mJSProjectionMatrix,
  60                           mProjectionMatrix.components, 16, aRv);
  61     if (!mJSProjectionMatrix) {
  62       return;
  63     }
  64   }
  65   if (mJSProjectionMatrix) {
  66     JS::ExposeObjectToActiveJS(mJSProjectionMatrix);
  67   }
  68   aRetval.set(mJSProjectionMatrix);
  69 }
  70
  71 already_AddRefed<XRRigidTransform> XRView::GetTransform(ErrorResult& aRv) {
  72   if (!mTransform) {
  73     mTransform = new XRRigidTransform(mParent, mPosition, mOrientation);
  74   }
  75   RefPtr<XRRigidTransform> transform = mTransform;
  76   return transform.forget();
  77 }
  78
  79 }  // namespace mozilla::dom