Hello guys,
I finally get to my other windows laptop and run the testcase on that system
too.
Both compiled in release, using osg as a shared lib; the results:
WIN32:
*** test using GLUT ***
cpu time: 1641 milliseconds
effective time: 1.64645 seconds
average fps: 607.367
*** test using osgviewer class only ***
cpu time: 1656 milliseconds
effective time: 1.66006 seconds
average fps: 602.389
OSX:
*** test using GLUT ***
cpu time: 391.799 milliseconds
effective time: 2.70822 seconds
average fps: 369.246
*** test using osgviewer class only ***
cpu time: 943.835 milliseconds
effective time: 16.8232 seconds
average fps: 59.4417
beside the performance difference (I guess because of the integrated intel
graphics on my macbook), what I feel strange is that on win32 the osgviewer
class is not bound to the 60Hz refresh rate, and the performances are
consistent in GLUT/nonGLUT "mode" (607 vs 602 fps), while in OSX there is a
huge difference between the two (369 vs 60 fps).
Maybe this is already known, or it's simply a matter of better setting up
the application.
If the testcase is needed I can attach it (is it possible to this mailing
list?) or paste the source code the the email, it's a single file. Or you
can reproduce it using the standard "osgviewer" application distributed with
osg.
The calls I'm doing to create the viewer are basically:
osgViewer::Viewer* viewer = new osgViewer::Viewer();
viewer->setSceneData( ****myscenenode*** );
viewer->setCameraManipulator(new osgGA::TrackballManipulator);
viewer->addEventHandler(new osgViewer::StatsHandler);
viewer->realize();
while (true)
{
// update the viewer
viewer->frame();
(...)
}
thanks again!
Davide
>
> Robert,
> I set up a simple test, with only a rotating cube displayed with:
> 1) osgviewer using GLUT
> 2) osgviewer standalone class
>
> in both I used double-buffered 800x600 window.
> I only tested on my mac yet, but tomorrow I will test on windows too.
> The results are:
> ** standalone **
> cpu time: 1001.35 milliseconds
> effective time: 16.796 seconds
> average fps: 59.538
> ** using glut **
> cpu time: 458.949 milliseconds
> effective time: 2.71029 seconds
> average fps: 368.964
>
> I think that you were right and I was misinterpreting the results: it is
> evident that the standalone osgviewer version is fixed on 60Hz, which is my
> laptop display refresh rate.
> The glut version seems not to be bound to the display refresh but the
> doublebuffering is enabled...
> Probably there is something I still ignore just under the hood, on how the
> refresh is handled.
>
> The same difference appears with the standard "osgviewer" and
> "osgviewerGLUT" applications built with cmake (in both 2.4.0 and 2.6.0)
>
> Tomorrow I will try on windows, with the same code. For what I observed, I
> expect to have a fps higher to 60Hz there, I will let you know.
> Just in case, is it possible to attach the testcase to a message directed
> to
> the mailing list?
>
>
> thanks!
>
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