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+ // Copyright (C) 2026 The Qt Company Ltd.
+ // SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0-only
+
+ #include <QTest>
+ #include <QQuickView>
+
+ #include <QtQuick3D/private/qquick3dcontentlayer_p.h>
+ #include <QtQuick3D/private/qquick3dnode_p.h>
+
+ #include "../shared/util.h"
+
+ // Content layers at runtime: a node moved onto or off the camera's layers
+ // after the first frame must appear or disappear without any other change to
+ // the scene. The node's tag is not part of the transform and opacity update,
+ // so the layer filter has to be redone when a tag changes.
+ class tst_Layers : public QQuick3DDataTest
+ {
+ Q_OBJECT
+
+ private slots:
+ void initTestCase() override;
+ void layersChangeAtRuntime();
+
+ private:
+ bool hasRed(const QImage &image) const;
+ };
+
+ void tst_Layers::initTestCase()
+ {
+ QQuick3DDataTest::initTestCase();
+ if (!initialized())
+ return;
+ }
+
+ bool tst_Layers::hasRed(const QImage &image) const
+ {
+ // The cube fills the middle of the view; sample the centre.
+ const QColor c = image.pixelColor(image.width() / 2, image.height() / 2);
+ return c.red() > 150 && c.green() < 80 && c.blue() < 80;
+ }
+
+ void tst_Layers::layersChangeAtRuntime()
+ {
+ QScopedPointer<QQuickView> view(createView(QStringLiteral("layerschange.qml"), QSize(200, 200)));
+ QVERIFY(view);
+ view->show();
+ QVERIFY(QTest::qWaitForWindowExposed(view.data()));
+ QVERIFY(waitForFrames(view.data(), 2));
+
+ auto *box = view->rootObject()->findChild<QQuick3DNode *>(QStringLiteral("box"));
+ QVERIFY(box);
+ QCOMPARE(box->layers(), int(QQuick3DContentLayer::Layer1));
+
+ // Outside the camera's mask: not drawn.
+ QVERIFY(!hasRed(grab(view.data())));
+
+ // Onto the camera's layer: drawn on the next frames.
+ box->setLayers(int(QQuick3DContentLayer::Layer0));
+ QVERIFY(waitForFrames(view.data(), 2));
+ QVERIFY(hasRed(grab(view.data())));
+
+ // And off again.
+ box->setLayers(int(QQuick3DContentLayer::Layer2));
+ QVERIFY(waitForFrames(view.data(), 2));
+ QVERIFY(!hasRed(grab(view.data())));
+ }
+
+ QTEST_MAIN(tst_Layers)
+ #include "tst_layers.moc"