[fnord123]

You're right. And Vulkan is based on Mantle which was already available in 2013 (in drivers; with api docs available in 2015 for some reason[1]). Why Kronos/Valve/etc didn't use Metal as a starting point, I don't know.

[1] http://www.anandtech.com/show/9095/amd-mantle-api-programmin...