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diff --git a/examples/declarative/openglunderqml/squircle.py b/examples/declarative/openglunderqml/squircle.py
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+#############################################################################
+##
+## Copyright (C) 2021 The Qt Company Ltd.
+## Contact: http://www.qt.io/licensing/
+##
+## This file is part of the Qt for Python examples of the Qt Toolkit.
+##
+## $QT_BEGIN_LICENSE:BSD$
+## You may use this file under the terms of the BSD license as follows:
+##
+## "Redistribution and use in source and binary forms, with or without
+## modification, are permitted provided that the following conditions are
+## met:
+## * Redistributions of source code must retain the above copyright
+## notice, this list of conditions and the following disclaimer.
+## * 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.
+## * Neither the name of The Qt Company Ltd nor the names of its
+## contributors may be used to endorse or promote products derived
+## from this software without specific prior written permission.
+##
+##
+## THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND 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 THE COPYRIGHT
+## OWNER OR 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."
+##
+## $QT_END_LICENSE$
+##
+#############################################################################
+
+from PySide6.QtCore import Property, QRunnable, Qt, Signal, Slot
+from PySide6.QtQuick import QQuickItem, QQuickWindow
+
+from squirclerenderer import SquircleRenderer
+
+
+class CleanupJob(QRunnable):
+ def __init__(self, renderer):
+ super().__init__()
+ self._renderer = renderer
+
+ def run(self):
+ del self._renderer
+
+
+class Squircle(QQuickItem):
+
+ tChanged = Signal()
+
+ def __init__(self, parent=None):
+ super().__init__(parent)
+ self._t = 0.0
+ self._renderer = None
+ self.windowChanged.connect(self.handleWindowChanged)
+
+ def t(self):
+ return self._t
+
+ def setT(self, value):
+ if self._t == value:
+ return
+ self._t = value
+ self.tChanged.emit()
+ if self.window():
+ self.window().update()
+
+ @Slot(QQuickWindow)
+ def handleWindowChanged(self, win):
+ if win:
+ win.beforeSynchronizing.connect(self.sync, type=Qt.DirectConnection)
+ win.sceneGraphInvalidated.connect(self.cleanup, type=Qt.DirectConnection)
+ win.setColor(Qt.black)
+ self.sync()
+
+ def cleanup(self):
+ del self._renderer
+ self._renderer = None
+
+ @Slot()
+ def sync(self):
+ if not self._renderer:
+ self._renderer = SquircleRenderer()
+ self.window().beforeRendering.connect(self._renderer.init, Qt.DirectConnection)
+ self.window().beforeRenderPassRecording.connect(
+ self._renderer.paint, Qt.DirectConnection
+ )
+ self._renderer.setViewportSize(self.window().size() * self.window().devicePixelRatio())
+ self._renderer.setT(self._t)
+ self._renderer.setWindow(self.window())
+
+ def releaseResources(self):
+ self.window().scheduleRenderJob(
+ CleanupJob(self._renderer), QQuickWindow.BeforeSynchronizingStage
+ )
+ self._renderer = None
+
+ t = Property(float, t, setT, notify=tChanged)