Jim, thanks for your answer. So it would be hard to exit "windows world only"...
To me, DirectX12 is good for Windows users and Nvidia/ATI industry (except Windows XP users of course ;-)
OpenGL/Open GL ES is good for Windows / Linux / MacOS X / phones / etc... users
This morning, i watched this conf (oriented of course but i agree with most of the intervenants ) :
Moving Your Games to OpenGL -Rich Geldreich (Valve), Dan Ginsburg (Valve), Peter Lohrmann (Valve), Jason Mitchell (Valve)
Moving your Games to OpenGL (pdf, 65 pages)
http://blog.wolfire.com/2010/01/Why-...nd-not-DirectX
Most of Indie games makers choosed OpenGL of course
Arnaud aka _bigdan_
an old french amigan who still use
MorphOS and MacOS X in 2014