htc vive resolution upscaling with mobile gpu

is it possible to upscale the resolution for the vive (or other vr headset)?

i mean is it possible to render a low resolution image (twice 540x600 instead of twice 1080x1200) and upscale the resolution to native resolution (twice 1080x1200) so you can use a notebook gpu?

also has anyone tried it? if so how can it be done?

ps i realize vr at low resolution is not ideal, but i use my motorola moto g2 (720p) with google cardboard and don't mind the screen door or the low res... especially for mobile vr

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