Hi all,
Here we use osg 2.8.2 and have a requirement to cap the framerate in certain
cases. We found that doing the following caused us to barely reach the
framerate limit, so instead of hitting 30 fps it was around 28.X fps.
Code:
while(!viewer.done())
{
osg::Timer_t startFrameTick = osg::Timer::instance()->tick();
viewer.frame();
osg::Timer_t endFrameTick = osg::Timer::instance()->tick();
double frameTime = osg::Timer::instance()->delta_s(startFrameTick,
endFrameTick);
OpenThreads::Thread::microSleep(static_cast<unsigned
int>(0.95*1000000.0*(minFrameTime-frameTime)));
if (frameTime < minFrameTime)
OpenThreads::Thread::microSleep(static_cast<unsigned
int>(1000000.0*(minFrameTime-frameTime)));
}
however the following code lets us hit exactly 30.0 fps or whatever we ask:
Code:
void CustomViewer::frame(double simulationTime)
{
if (_done) return;
float fpsLimit = 30.0;
osg::Timer_t currentTime = osg::Timer::instance()->tick();
if (osg::Timer::instance()->delta_s(lastFrameTime, currentTime) < (1.0 /
fpsLimit))
return;
lastFrameTime = currentTime;
if (_firstFrame)
{
viewerInit();
if (!isRealized()) realize();
_firstFrame = false;
}
advance(simulationTime);
eventTraversal();
updateTraversal();
renderingTraversals();
}
any thoughts or comments about why this is the case? Also, does the constant
spinning in the second example mess with OSG multithreading?
thank you!
------------------
Read this topic online here:
http://forum.openscenegraph.org/viewtopic.php?p=45919#45919
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