Hi Todd, On Tue, Jul 8, 2008 at 6:03 PM, Todd J. Furlong <[EMAIL PROTECTED]> wrote: > Not sure if this is related, but... > > When timing an OpenGL application, we always make sure to do a glFinish() > before recording the time at the end of a draw. The glFinish waits for the > OpenGL commands in the pipeline to complete before returning and gives a > truer measurement of the time. Without waiting, draw timing tends to be > reported as higher than it really is until the FIFO buffer gets filled.
This is typically true for trying to time OpenGL, but when you have the OpenGL timing stats extension supported you can put timing markers directly into the fifo and get back actual elapsed time between points for what is happening down on the GPU. This extension means you can get a clear picture of what's happening on the GPU without needing to flush/finish. osgViewer supports this extension, and the stats that this thread are covering have these GPU stats in place. Robert. _______________________________________________ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
