GDC 2015: top tech from the show

With the advent of PAX East, a chunk of brave GDC attendees have left sunny California to head off into cold, snowy Boston.

But there are plenty of people left milling about the show floor, and we're not done with this year's dev conference yet.

So what have we seen so far?

Valve Steam Controller

The latest Steam Controller debuts at GDC 2015

John Carmack

A highlight of GDC so far - listening to John Carmack