Will the eye tracking data be directly available to developers?
Also, can I hack the OS? Specifically interested in direct VR rendering (other headsets don't allow to bypass compositor).
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Though Valve has put a focus on developer ease and very low software lockdown in the recent years with their hardware, so I'd say the chances on direct rendering are quite good!
The best known is perhaps https://en.wikipedia.org/wiki/Project_Looking_Glass but there's many others, at varying stages of development. It will be interesting to see if custom OS/UX development is made available for this device. We'd also need quite a bit of custom development to make the OS comprehensively usable with gamepad-like controllers alone (no mouse or keyboard required). The existing work on "10-ft." media center interfaces can provide a useful starting point for this but it's far from covering all possible uses.