The Vulkan API is still being argued about and will not be finalised until later this year, but Valve has been developing their own Intel GPU reference driver for Vulkan to help early adopters boot-strap their code.Source: FUD Zilla
During their presentation at GDC2015 Valve announced that its Intel Linux driver will be open-sourced, but they haven't provided a time-frame for doing so.
Valve also confirmed that the Source 2 Engine supports the alpha Vulkan API today and that Vulkan will be supported across the board on Steam Machines.
Valve created its own Intel open-source graphics driver for Linux
Posted on Friday, March 06 2015 @ 13:56 CET by Thomas De Maesschalck