bugle-stats_fragments — gather fragment counts
stats_fragments filter-set provides
signals for the number of fragments to other filter-sets. It must
be listed in a chain that uses any statistics related to fragment
It is simply a wrapper around GL_ARB_occlusion_query, so a fragment is defined exactly as in that extension (and OpenGL 1.5), and will not work unless that extension is supported.
Fragment counting will not work in applications that use occlusion queries. A warning is displayed when this is detected.