On Tue, 02 May 2017 07:45:25 -0700 Keith Packard <keithp@xxxxxxxxxx> wrote: > Pekka Paalanen <ppaalanen@xxxxxxxxx> writes: > > I presume that if "desktop" is set to "true", it implies that the HMD > > is capable of showing a simple 2D canvas in stereo without any special > > rendering and with the default video mode. That is, creating a sort of > > a virtual 2D monitor. That would be nice. > > I was thinking that 'desktop' would be true for non-HMD displays that > didn't need the VR compositor. If you've got a VR compositor and want to > paint the desktop inside the VR environment, then I think you'd want to > create a synthetic monitor and hand images from that to the VR > compositor each frame. Hi Keith, do you mean to list all kinds of display devices in the database? I was assuming it would list only HMDs, so not in database would imply it's a normal display and good for extending the desktop to. Or did you mean it for exceptions? As in, define a range of HMDs, but the vendor put a few normal displays in the middle of the range, so one needs to be able to exclude those? The reason I mentioned "virtual 2D display" was that I recall hearing that actually exists in some HMD hardware. If you don't do anything to enable a 3D mode, the HMD will process the signal to produce a virtual 2D display in front the user. In such case, there is no need for a VR compositor, the plain old 2D image signal will be shown correctly on a plane in the virtual space by the HMD hardware itself. I asked on #openhmd and was pointed to "Cinematic mode" on PSVR, and found e.g. this: http://www.psu.com/feature/31372/How-to-use-PlayStation-VR-cinematic-mode-effectively Mind the note towards the bottom: you don't actually need a PS4 to use it - so it must be something built into the HMD. However, reading more details from https://blog.us.playstation.com/2016/10/03/playstation-vr-the-ultimate-faq/ reveals that there is actually a separate processor box providing the cinematic mode. Sounds like it's your VR compositor as a middle-man hardware device rather than just a program. :-) Thanks, pq
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