On 15/07/2010, at 1:29 AM, ext Almo Nito wrote:
> I was wondering if this was the right way to enable HW Acceleration for QML:
>
> http://pastebin.com/DLA1GuF2
If this is an embedded, X11-based system, you'll probably also want to call
QApplication::setGraphicsSystem("raster") somewhere in your code. This
combination (raster graphics system + QGLWidget viewport) is what you get from
qmlviewer when running with -opengl on X11 (as qmlviewer uses raster by default
for X11). Using the raster graphics system on its own will outperform this in
some scenarios (for example when only a small portion of the screen needs to be
updated), but it also has much, much worse 'worst-case' performance (e.g. with
raster you might see a demo that runs 5fps at parts and 60fps at others; while
with raster + QGLWidget the demo will stay between 40fps-55fps).
I've added this information to the performance docs, so it should show up in
the snapshots
(http://doc.qt.nokia.com/4.7-snapshot/qdeclarativeperformance.html) in the next
few days.
Regards,
Michael
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