GL(Mesa) screen hacks for xscreensaver

 XScreenSaver is a modular screen saver and locker for X11,
 containing more than 200 screen savers.
 .
 This package contains a small selection of 3D (OpenGL) screen
 saver modules from the xscreensaver collection. This package is
 used by both xscreensaver and gnome-screensaver.
 .
 This is the set of GL screensavers shipped by default:
 antspotlight, glblur, glcells, glmatrix, glschool,
 glslideshow, gltext, and hypertorus.
 More GL screensavers can be found in the xscreensaver-gl-extra package.
 .
 More display modes can be found in the xscreensaver-data,
 xscreensaver-data-extra and xscreensaver-gl-extra packages.