AH, me, too. Very st....OOOOHHHH, AMD, haha, well, yeah... AMD is somehow always a bit of a wildcard (pun intended) when it comes to more dubious openGL. Seems like even between AMDs own cards are such strange differences that it becomes nearly unpredictable, how it may behave. I haven't had any such troubles ever with NVidia, which is why I've become rather a fan of theirs. Even the cheapest 3rd party vendor that uses NVidia chips performs beautifully. My GTX970 brings me nothing but joy since I bought it and it was fairly cheap...probably ridiculously cheap now already?!
Anyway, yes, I have to make as sure as I can that it runs properly on all cards that support openGL and should meet the minimum specifications. AMD and Intel are both so much harder to please than NVidia. I can and do test on Intel, but cannot test on AMD just yet. Once Verve generates some kind of funding for me so I can begin investing in things such as AMD based system, a mac and possibly some mobile tablets, I can reasonably expand compatibility and figure out how to solve stranger troubles. But until then....it's rough.
Well, at the very least, what you're doing there looks very cool!
...and I'm sure, if I get a proper handle on turning such things into features, many people will be very happy!