/// Utility function you call before something you want to time, so that the
/// recorded times will all be consistent using the viewer's time.
void startTiming(osgViewer::Viewer& viewer, const std::string& name)
{
osg::Timer_t tick = osg::Timer::instance()->tick();
double currentTime = osg::Timer::instance()->delta_s(viewer.getStartTick(), tick);
int framenumber = viewer.getFrameStamp()->getFrameNumber();
viewer.getViewerStats()->setAttribute(framenumber, name + " begin", currentTime);
}
/// Utility function you call after something you want to time, so that the
/// recorded times will all be consistent using the viewer's time.
void endTiming(osgViewer::Viewer& viewer, const std::string& name)
{
osg::Timer_t tick = osg::Timer::instance()->tick();
double currentTime = osg::Timer::instance()->delta_s(viewer.getStartTick(), tick);
int framenumber = viewer.getFrameStamp()->getFrameNumber();
viewer.getViewerStats()->setAttribute(framenumber, name + " end", currentTime);
double begin = 0.0;
double elapsed = 0.0;
if (viewer.getViewerStats()->getAttribute(framenumber, name + " begin", begin))
{
elapsed = currentTime - begin;
}
viewer.getViewerStats()->setAttribute(framenumber, name + " time taken", elapsed);
}