[Interest] Issues with QT5 demos on i.MX6 (arm - vivanteGPU)

[Thomas Senyk]

On Wed, March 13, 2013 16:55:00 Francisco Carrillo wrote:
> Hello Dear Qt Experts
> 
> 
> 
> I am running into some strange issues with Qt5. I have encountered the
> issues  with a version I built myself.  I've searched the forums and don't
> see any discussion of these issues, though I was searching by error message
> and might have missed something.
> 
> These issues can be seen in the Qt OpenGL examples.  "hellogl_es2" and
> "2dpaint" seem to display one rendered frame and then break --
> "hellogl_es2" shows the QT word and bubbles, and the GUI is hidden, while
> "2dpaint" just shows the openGL version without label.
> 
> It seems that when including  a QGLWidget on a form, the QGLWidget would
> work OK, but the rest of the form would not appear. I couldn't click any
> buttons or do anything.
> 
> 
> Along with these problems I would also see one or more of these error
> messages in the output:
> 
> * This plugin does not support setParent!
> * This plugin does not support propagateSizeHints()
> * QOpenGLContext::swapBuffers() called with non-opengl surface

You should have mentioned which platform plugin you're using.
I strongly suspect eglfs?
If so:
NO hellogl_es2 on eglfs-platform-plugin!!
It's not working, it's not intended to work, it will never work!

Try "hellowindow"-example ...it has no surrounding qwidget controls, and 
that's what you want on eglfs: one single on-screen (opengl-)surface!

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> 
> If I try with my wayland rootfs, the story is different "hellogl_es2" demo
> will show one good frame and keep it freezed in the background while the
> animation continues on top of that, the problem is that it flickers between
> background and animation and it looks horrible.

Guess that part is better answered by the wayland guys
 ... but to give me 5cents:
A full windowing-system integration should support the mixture of all types of 
QSurface (in this case one top-level QWidget and a QGLWidget) instances within 
one QWindow (right?)... so it should work .. eventualy ;)


... also: try "hellowindow"
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> Do you have any hint or idea what could be wrong?