[Development] Accelerated/OpenGL drawing under Qt 5.0

[Chris Meyer]

On Thu, Sep 13, 2012 at 1:57 AM, Samuel Rødal <samuel.rodal at nokia.com> wrote:
> On 09/12/2012 04:33 PM, ext Chris Meyer wrote:
>> On Tue, Sep 11, 2012 at 9:52 PM, Chris Meyer <cmeyer1969+qt at gmail.com> wrote:
>>> My software makes use of accelerated drawing using the techniques with
>>> QGraphicsView and QGraphicsScene shown in this article:
>>>
>>> http://doc.qt.nokia.com/qq/qq26-openglcanvas.html
>>>
>>> Unfortunately things don't work smoothly under Qt 5.0.
>>>
>>> Is this technique expected to work? If not, what is the suggested way
>>> to get accelerated drawing under Qt 5.0?
>
> It should still work, though there could still be bugs at this stage.
>
>>> Also, QGLPixelBuffer::hasOpenGLPbuffers() always returns false, where
>>> it returned it true under 4.8. Is this also expected?
>
> Hmm, I see that for now the QGLPixelBuffer implementation is stubbed out
> in Qt 5. I'd recommend using QOpenGLFramebufferObject instead, as pixel
> buffers are a pretty deprecated way of doing offscreen rendering with
> OpenGL these days.
>
>> As a further isolation of this problem... I'm finding that adding a
>> QGLWidget (not even customized) into my view hierarchy (QMainWindow ->
>> QWidget/QVBoxLayout -> QStackedWidget -> QWidget/QVBoxLayout ->
>> QGLWidget) makes bad things happen to layouts, displays and mouse
>> handling.
>>
>> Anyone have success with QGLWidget in a complex hierarchy on Qt 5.0 /
>> Mac OS 10.8.1? Any known issues?
>>
>> This issue looks similar, but I'm seeing it on the Mac:
>> https://bugreports.qt-project.org/browse/QTBUG-26826
>
> I'd suggest you create a separate task for it, with a simplified example.
>
> --
> Samuel

I've filed a bug and built a short test program to demonstrate on bug
with QGLWidget:

https://bugreports.qt-project.org/browse/QTBUG-27214