Following my comment about gnome-shell useless with nouveau driver , I installed KDE for testing Plasma about 3D as suggested by Kevin. As expected, effects will not work with OpenGL enabled for composing. What I did not know before is the presence of XRender option for Plasma that give those effects in glory. That test brings a question about gnome-shell: why Gnome development did not use XRender as fallback option or even providing that option? Enlightenment can least produce some similar effects without requiring hardware acceleration.