[Qt-interest] QGLWidget 30 fps maximum on Windows XP

[andy fillebrown]

Whelp, 30 fps definitely seems to be the maximum for WinXP (on my
machine, anyway).  I tested the qml-scenegraph qt-labs project on the
same machine using Windows 7, and the fps is not limited to 30 fps
like it is on XP.  I guess that's what's meant by "window manager".

At least I've got a good reason to switch to Win7, now =)

Cheers,
~ andy.f



On Tue, Jan 18, 2011 at 8:28 AM, andy fillebrown
<andy.fillebrown at gmail.com> wrote:
> I should add that every example I've tried from qml, qt3d, and other
> various qt-labs projects -- all max out at 30 fps, too.  Is 30 fps the
> max on Windows XP?   Does anybody know of a project I can look at that
> does animations faster than 30 fps?
>
> Cheers,
> ~ andy.f
>
>
>
> On Mon, Jan 17, 2011 at 11:40 PM, andy fillebrown
> <andy.fillebrown at gmail.com> wrote:
>> Hi all,
>>
>> I'm trying to get a QGLWidget to swap buffers at 60 fps (the monitor
>> refresh rate), but it seems no matter what I try, the fps maxes out at
>> 30 fps. If I drag a corner of the window to resize the main window
>> containing the QGLWidget, the fps jumps and starts approaching 60 fps,
>> but as soon as I stop dragging the fps drops back down to a rock-solid
>> 30 fps.
>>
>> I've read that "window manager" may be responsible for such a low
>> frame-rate, but I'm not sure what that means or if it's even relevant
>> (there's so much conflicting info re: opengl out there -- so many
>> things to try that don't work).
>>
>> Does anyone know what's going on -- why is the fps seemingly locked to 30 fps?
>>
>> Frustrated,
>> ~ andy.f
>>
>