PyQt5 OpenGL Issue with versionFunctions

[Ognyan Moore]

Hi Phil,

A PyQtGraph contributor ran into a PyQt5 issue involving opengl
context.versionFunctions().

>From what they can tell, the version only manifests itself for
QOpenGLWidget used as a viewport to QGraphicsView.  If two (or more)
QGraphicsItem separately store the result of versionFunctions(), all except
one of the returned versionFunctions() instances will get deleted.

The behavior is as expected on PyQt6.

Here is a script to reproduce the issue:

from PyQt5 import QtCore, QtGui, QtWidgets, sip
# from PyQt6 import QtCore, QtGui, QtWidgets, sip

if QtCore.PYQT_VERSION < 0x60000:
    QtOpenGLWidgets = QtWidgets
else:
    from PyQt6 import QtOpenGLWidgets, QtOpenGL

class MyItem(QtWidgets.QGraphicsRectItem):
    def __init__(self, *args, **kwargs):
        super().__init__(*args, **kwargs)
        self.context = None
        self.glfn = None

    def paint(self, painter, option, widget):
        context = widget.context()
        if context is not self.context:
            self.context = context
            if QtCore.PYQT_VERSION < 0x60000:
                profile = QtGui.QOpenGLVersionProfile()
                profile.setVersion(2, 0)
                self.glfn = context.versionFunctions(profile)
            else:
                profile = QtOpenGL.QOpenGLVersionProfile()
                profile.setVersion(2, 0)
                self.glfn =
QtOpenGL.QOpenGLVersionFunctionsFactory.get(profile, context)

        # print(self.context, self.glfn)
        print(sip.isdeleted(self.glfn))
        color = QtCore.Qt.GlobalColor.red if sip.isdeleted(self.glfn) else
QtCore.Qt.GlobalColor.green
        self.setBrush(QtGui.QBrush(color))
        super().paint(painter, option, widget)

app = QtWidgets.QApplication([])
gview = QtWidgets.QGraphicsView()
gview.resize(400, 400)
scene = QtWidgets.QGraphicsScene()
gview.setScene(scene)
viewport = QtOpenGLWidgets.QOpenGLWidget()
gview.setViewport(viewport)

rect1 = MyItem(0, 0, 100, 100)
scene.addItem(rect1)
rect2 = MyItem(0, -100, 100, 100)
scene.addItem(rect2)

gview.show()
app.exec()

The output on PyQt6 when running is:

False
False
False
False
False
False

The output on PyQt5 when running is:

False
False
True
False
True
False

The resulting image is different to highlight the issue as well.

Let me know if there is additional information I can provide.

Thanks,
Ogi
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