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76 lines
3.0 KiB
C++
76 lines
3.0 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim: set ts=8 sts=2 et sw=2 tw=80: */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this file,
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* You can obtain one at http://mozilla.org/MPL/2.0/. */
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#include "mozilla/dom/XRBoundedReferenceSpace.h"
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#include "mozilla/dom/XRRigidTransform.h"
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#include "mozilla/dom/DOMPoint.h"
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#include "VRDisplayClient.h"
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namespace mozilla {
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namespace dom {
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XRBoundedReferenceSpace::XRBoundedReferenceSpace(nsIGlobalObject* aParent,
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XRSession* aSession,
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XRNativeOrigin* aNativeOrigin)
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: XRReferenceSpace(aParent, aSession, aNativeOrigin,
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XRReferenceSpaceType::Bounded_floor) {}
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JSObject* XRBoundedReferenceSpace::WrapObject(
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JSContext* aCx, JS::Handle<JSObject*> aGivenProto) {
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return XRBoundedReferenceSpace_Binding::Wrap(aCx, this, aGivenProto);
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}
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void XRBoundedReferenceSpace::GetBoundsGeometry(
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nsTArray<RefPtr<DOMPointReadOnly>>& result) {
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const auto size =
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mSession->GetDisplayClient()->GetDisplayInfo().GetStageSize();
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if (size.width == 0 || size.height == 0) {
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return;
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}
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// https://immersive-web.github.io/webxr/#dom-xrboundedreferencespace-boundsgeometry
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// bounds geometry must be premultiplied by the inverse of the origin offset.
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gfx::PointDouble3D offset = mNativeOrigin->GetPosition();
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const auto addPoint = [&](const double x, const double z) {
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RefPtr<DOMPointReadOnly> obj = new DOMPointReadOnly(
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GetParentObject(), x - offset.x, 0.0f, z - offset.z, 1.0f);
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result.EmplaceBack(obj);
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};
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addPoint(-size.width * 0.5f, size.height * 0.5f);
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addPoint(size.width * 0.5f, size.height * 0.5f);
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addPoint(size.width * 0.5f, -size.height * 0.5f);
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addPoint(-size.width * 0.5f, -size.height * 0.5f);
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// TODO (Bug 1611526): Support WebXR bounded reference spaces
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}
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already_AddRefed<XRReferenceSpace>
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XRBoundedReferenceSpace::GetOffsetReferenceSpace(
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const XRRigidTransform& aOriginOffset) {
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RefPtr<XRBoundedReferenceSpace> offsetReferenceSpace =
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new XRBoundedReferenceSpace(GetParentObject(), mSession, mNativeOrigin);
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// https://immersive-web.github.io/webxr/#multiply-transforms
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// An XRRigidTransform is essentially a rotation followed by a translation
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gfx::QuaternionDouble otherOrientation = aOriginOffset.RawOrientation();
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// The resulting rotation is the two combined
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offsetReferenceSpace->mOriginOffsetOrientation =
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mOriginOffsetOrientation * otherOrientation;
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// We first apply the rotation of aOriginOffset to
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// mOriginOffsetPosition offset, then translate by the offset of
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// aOriginOffset
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offsetReferenceSpace->mOriginOffsetPosition =
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otherOrientation.RotatePoint(mOriginOffsetPosition) +
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aOriginOffset.RawPosition();
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return offsetReferenceSpace.forget();
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}
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} // namespace dom
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} // namespace mozilla
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