added glflush to the rendering loop (theoretically this is the right way to do the timings etc, practically most drivers ignore the call, but at least it now looks correct :-) )
added glflush to the rendering loop (theoretically this is the right way to do the timings etc, practically most drivers ignore the call, but at least it now looks correct :-) )

git-svn-id: 83c4c97093aeea62ac982fbfd516bf9db27f5c99@1275 c36c8488-0289-0348-9b64-b301f74bd9a7

BlueBrain/Tuvok,BlueBrain/Tuvok,BlueBrain/Tuvok