Fade: implement fading effect
Fade: implement fading effect

Good lord this one took a while. Note to self that the forums on
opengl.org and ##opengl on freenode are WORTHLESS. It's basically
impossible to get help on those.

Signed-off-by: Steven Noonan <4068f0880b399410602d694b3cc711c8a8f4727e@uplinklabs.net>

tycho/cerberus,tycho/cerberus,tycho/cerberus,tycho/cerberus