Am Donnerstag 25 März 2010 10:06:21 schrieb Roderick Colenbrander:
Note I don't know much about the current FBO extension situation but since FBOs are finally quite common, can't we expect some features to be around? If this functionality is missing, perhaps we should just not work and let vendors fix their drivers. I guess AMD and Nvidia are quite decent and perhaps Mesa also supports the needed stuff. Not sure about Apple.
Mesa supports FBOs these days, but not on radeon cards prior to r200 chips. Nouveau and Intel should be ok, I don't know about matrox and other odd cards.
I think we could justify killing backbuffer offscreen rendering(so we only have FBOs left), but we cannot justify not running at all without FBOs. Then thinking is that pretty much all apps that use offscreen rendering are dx8+ ones, so games that need offscreen rendering are unlikely to run on a Radeon 7500 anyway.
There's of course the situation that KMS-based Mesa currently has sucky performance and many users still have old drivers installed.