Using old QGLwidget from Qt 4.8.2
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wrote on 15 Jul 2020, 19:10 last edited by QttCoreTester
I know QGLwidget is obsolete but I have application that use it. There is a widget that was inherited from Qglwidget. Recently after new Intel graphics driver updates I observed a crash.
Many gl calls from the Widget throws floating point exception. Is there someone who had a similar experience.
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Hi and welcome to devnet,
Since you updated the driver, it could be an issue of the driver.
Are you really tied to 4.8.2 ? If locked to Qt 4, then try with 4.8.7 which is the latest and last from that series. Otherwise, please consider moving to Qt 5.
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wrote on 15 Jul 2020, 19:29 last edited by QttCoreTester
Hi Thank you.
I tried gl calls directly, there is no exception. But once Qglwidget is instantiated, calls "InitGL" most gl calls starts to throw exception. So, one cannot blame the driver update.
Qt5 is not an option. Maybe 4.8.7 is an option, Are 4.8.2 and 4.8.7 compatible with each other.
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Hi Thank you.
I tried gl calls directly, there is no exception. But once Qglwidget is instantiated, calls "InitGL" most gl calls starts to throw exception. So, one cannot blame the driver update.
Qt5 is not an option. Maybe 4.8.7 is an option, Are 4.8.2 and 4.8.7 compatible with each other.
@QttCoreTester said in Using old QGLwidget from Qt 4.8.2:
Are 4.8.2 and 4.8.7 compatible with each other.
Should be.
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@QttCoreTester said in Using old QGLwidget from Qt 4.8.2:
Are 4.8.2 and 4.8.7 compatible with each other.
Should be.
wrote on 16 Jul 2020, 14:38 last edited byI tried Qt 4.8.7, OpenGL calls still crashes on Windows 10 with new Intel graphics drivers.
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Check if it's really the latest driver, if not update, otherwise go back to the previous version.
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I tried Qt 4.8.7, OpenGL calls still crashes on Windows 10 with new Intel graphics drivers.
@QttCoreTester
Hi
Its odd that QGLwidget crashes but direct openGL calls are fine (if i understood you right) so
must be something in QGLwidget that is no longer compatible with that intel driver.Seems to be the end of the road for QGLwidget.
I wonder if its Intel related or it would crash on newer RTX cards too. -
wrote on 16 Jul 2020, 14:51 last edited by QttCoreTester
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wrote on 17 Jul 2020, 06:48 last edited by
My best guess is that newer drivers might have lost some functionality. Initially, OpenGL used calls like
glVertex(),glLight, etc. Modern OpenGL has found replacements for these. It could be that Intel is only implementing EGL, which would be a lot like modern OpenGL. This would also mean that old functionality is not available anymore. Does the driver list which versions (and maybe profiles) of OpenGL it is supporting? (Asking this question I also remember that somehow a more strict profile could be configured in your app.) -
My best guess is that newer drivers might have lost some functionality. Initially, OpenGL used calls like
glVertex(),glLight, etc. Modern OpenGL has found replacements for these. It could be that Intel is only implementing EGL, which would be a lot like modern OpenGL. This would also mean that old functionality is not available anymore. Does the driver list which versions (and maybe profiles) of OpenGL it is supporting? (Asking this question I also remember that somehow a more strict profile could be configured in your app.)wrote on 27 Jul 2020, 08:13 last edited by@SimonSchroeder The driver release notes just says it support OpenGL 4.6, no more info.
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wrote on 2 Aug 2020, 14:33 last edited by QttCoreTester 9 Apr 2020, 10:51
The issue is no longer observed with the latest Intel graphics driver beta version(27.20.100.8581). Fixed in latest release version 27.20.100.8587