vampyiere6 :
The problem is that its all open but nvida dont want it cost they wanna use their own stuff that they can put a premium price on, nvida only make stuffs that only works for their own cards. i dont say amd dosent do it but they are much more open and use stuff everyone can use if they want.
As others have said, while it's nice to see it open, it's still AMD's. Don't get me wrong, I like AMD, but this is something that should be really be run by its own, vendor neutral open source foundation, so that different vendors are encouraged to contribute.
That said, for something entirely new it's going to be an uphill struggle, meanwhile OpenGL is in that position now; granted it has had numerous problems of its own, but I think that more realistically they're the ones that could actually push a Mantle-like API into being adopted. The problem is whether they can, given the issues with changing OpenGL in the past, but I'm hoping it's something that could happen as there's now a lot of incentive for Valve to push OpenGL forwards since it's the only real API of choice on Linux. Besides, what's good for OpenGL is good for everyone IMO, since it's supported by all major platforms, and all major hardware, already.