[AD] Black alpha using PP on Android

[Trent Gamblin <nooskewl@xxxxxxxxxx>]

This issue has been around for me since the first time I tried programmable pipeline on Android. It only happens on some (I think most that I've tried) devices. What happens is all alpha is displayed black. In one part I draw a black rectangle that's translucent and it appears dark solid grey. Sprite alpha seems to be pure black but possibly would have grey edges with antialiasing on the sprites. Any ideas on things to try to fix it?

Thanks,
Trent