It is a fallback used for maintaining a persistent backbuffer if FBOs are not available. However it's not an important one because all drivers provide FBOs now.
http://bazaar.launchpad.net/~compiz-team/compiz/0.9.8/view/head:/plugins/opengl/src/screen.cpp#L1726
It is a fallback used for maintaining a persistent backbuffer if FBOs are not available. However it's not an important one because all drivers provide FBOs now.
http:// bazaar. launchpad. net/~compiz- team/compiz/ 0.9.8/view/ head:/plugins/ opengl/ src/screen. cpp#L1726