In SteamOS, we have achieved significant performance increases in graphics processing, and we’re now targeting audio performance and reductions in input latency at the operating system level.
- https://www.youtube.com/watch?v=btNVfUygvio
- http://www.paranormal-entertainment.com/idr/blog/posts/2012-...
You could take the statement on the site to seem that they could be working on their own stuff, but if you watch their video it seems that they are keen on working on existing things like SDL and participating in the Khronos group than building things from scratch.
As promised, the OS is built on Linux (not based on Ubuntu, we're told, but entirely custom), though you'd never know it as the only interactive layer is all Steam
[1] http://www.engadget.com/2013/11/04/valve-steam-machine-hands...
Actually, I'm pretty sure that spot belongs to Ubuntu, which is why:
> Valve has been focusing on Ubuntu up to now
They focus on Ubuntu release because that is where their target players are. SteamOS, being it's own release, doesn't have the same restriction.
> If they don't base SteamOS on Ubuntu, they will probably base directly of Debian testing
Nice save, anyways, the argument is moot now: http://store.steampowered.com/steamos/buildyourown
Debian being, indeed, The most obvious choice.
I am betting (and hoping) that they are going to start using Wayland as well as a custom sound framework.
I also wonder if they are using a custom packaging format based on top of .deb .