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/*
* Copyright (C) 2020 Igalia S.L. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
* THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
* THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "config.h"
#include "WebXRBoundedReferenceSpace.h"
#if ENABLE(WEBXR)
#include "DOMPointReadOnly.h"
#include "Document.h"
#include "WebXRRigidTransform.h"
#include "WebXRSession.h"
#include <wtf/TZoneMallocInlines.h>
namespace WebCore {
// https://immersive-web.github.io/webxr/#xrboundedreferencespace-native-bounds-geometry
// It is suggested that points of the native bounds geometry be quantized to the nearest 5cm.
static constexpr float BoundsPrecisionInMeters = 0.05;
// A valid polygon has at least 3 vertices.
static constexpr int MinimumBoundsVertices = 3;
WTF_MAKE_TZONE_OR_ISO_ALLOCATED_IMPL(WebXRBoundedReferenceSpace);
Ref<WebXRBoundedReferenceSpace> WebXRBoundedReferenceSpace::create(Document& document, WebXRSession& session, XRReferenceSpaceType type)
{
return adoptRef(*new WebXRBoundedReferenceSpace(document, session, WebXRRigidTransform::create(), type));
}
Ref<WebXRBoundedReferenceSpace> WebXRBoundedReferenceSpace::create(Document& document, WebXRSession& session, Ref<WebXRRigidTransform>&& offset, XRReferenceSpaceType type)
{
return adoptRef(*new WebXRBoundedReferenceSpace(document, session, WTFMove(offset), type));
}
WebXRBoundedReferenceSpace::WebXRBoundedReferenceSpace(Document& document, WebXRSession& session, Ref<WebXRRigidTransform>&& offset, XRReferenceSpaceType type)
: WebXRReferenceSpace(document, session, WTFMove(offset), type)
{
}
WebXRBoundedReferenceSpace::~WebXRBoundedReferenceSpace() = default;
std::optional<TransformationMatrix> WebXRBoundedReferenceSpace::nativeOrigin() const
{
// https://immersive-web.github.io/webxr/#dom-xrreferencespacetype-bounded-floor.
// Bounded floor space should be at the same height as local floor space.
return floorOriginTransform();
}
const Vector<Ref<DOMPointReadOnly>>& WebXRBoundedReferenceSpace::boundsGeometry()
{
updateIfNeeded();
return m_boundsGeometry;
}
ExceptionOr<Ref<WebXRReferenceSpace>> WebXRBoundedReferenceSpace::getOffsetReferenceSpace(const WebXRRigidTransform& offsetTransform)
{
if (!m_session)
return Exception { ExceptionCode::InvalidStateError };
RefPtr document = downcast<Document>(scriptExecutionContext());
if (!document)
return Exception { ExceptionCode::InvalidStateError };
// https://immersive-web.github.io/webxr/#dom-xrreferencespace-getoffsetreferencespace
// Set offsetSpace’s origin offset to the result of multiplying base’s origin offset by originOffset in the relevant realm of base.
auto offset = WebXRRigidTransform::create(originOffset().rawTransform() * offsetTransform.rawTransform());
return { create(*document, *m_session.get(), WTFMove(offset), m_type) };
}
// https://immersive-web.github.io/webxr/#dom-xrboundedreferencespace-boundsgeometry
void WebXRBoundedReferenceSpace::updateIfNeeded()
{
if (!m_session)
return;
auto& frameData = m_session->frameData();
if (frameData.stageParameters.id == m_lastUpdateId)
return;
m_lastUpdateId = frameData.stageParameters.id;
m_boundsGeometry.clear();
if (frameData.stageParameters.bounds.size() >= MinimumBoundsVertices) {
// Each point has to multiplied by the inverse of originOffset.
auto transform = valueOrDefault(originOffset().rawTransform().inverse());
for (auto& point : frameData.stageParameters.bounds) {
auto mappedPoint = transform.mapPoint(FloatPoint3D(point.x(), 0.0, point.y()));
m_boundsGeometry.append(DOMPointReadOnly::create(quantize(mappedPoint.x()), quantize(mappedPoint.y()), quantize(mappedPoint.z()), 1.0));
}
}
}
// https://immersive-web.github.io/webxr/#quantization
float WebXRBoundedReferenceSpace::quantize(float value)
{
// Each point in the native bounds geometry MUST also be quantized sufficiently to prevent fingerprinting.
// For user’s safety, quantized points values MUST NOT fall outside the bounds reported by the platform.
return std::floor(value / BoundsPrecisionInMeters) * BoundsPrecisionInMeters;
}
} // namespace WebCore
#endif // ENABLE(WEBXR)
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