[PD] Gem render out of the screen (and v4l2loopback)

Jack jack at rybn.org
Tue Mar 3 11:20:54 CET 2015

Hash: SHA1

Hello Olivier,

Le 03/03/2015 09:22, Cyrille Henry a écrit :
> hello
> Le 03/03/2015 00:58, Olivier Baudu a écrit :
>> Hi list,
>> Until now, and as far as I (think I) can remember, GEM was
>> rendering frames even if the window (with or without border) was
>> : - out of the screen - reduce in the tool-bar - hidden by an
>> other window
>> The last time I use this property was on an Ubuntu 13.10 both
>> with "pd-vanilla + gem from the depot" and " pd-extended" (but I
>> can't give you versions... because... well, I don't know them...
>> sorry)
>> On several different patches, I recorded GEM content (which was
>> not display on my desktop because of "offset" option) with the
>> combo [pix_record] / v4l2loopback in order to make a "fake
>> webcam" to stream. It was working. It is still working on
>> computers where those patches where installed.
>> Now, I am on Ubuntu 14.04 / GEM: 0.93.3 and if anything is put
>> over the GEM content, it seems to be that none of the pixel
>> "under" is rendered.
>> If I open the v4l2loopback device on VLC (or whatever) and hide
>> part of the GEM window (even by dragging icons from my desktop),
>> those parts are not refresh anymore.
>> Does GEM change its way to render ?
> yes, but only recently, 93.3 is unafected.
>> Is the Ubuntu 14.04 display different ?
> certainly. at least drivers are more optimized.
>> Do I misunderstood something ?
> rendering in a windows created out of the screen is not a good
> solution. Gem prodive framebuffer rendering. have a look the
> gemframebuffer help : this object allow to render anything in a
> framebuffer, and use this framebuffer as a texture. pix_snap can
> get back the pixel etc.

You have also an example in Gem examples/pix/26.framebuffer_readback.pd


> cheers c
>> Sorry if I'm fuzzy... If questions, I'll try to explain better.
>> Thanks in advance for any help.
>> 01ivier
> _______________________________________________ 
> Pd-list at lists.iem.at mailing list UNSUBSCRIBE and
> account-management -> http://lists.puredata.info/listinfo/pd-list

Version: GnuPG v1


More information about the Pd-list mailing list