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

[Olivier Baudu]

> Simon Wise wrote :
> but in very many use-cases not rendering content that is covered would 
> be a good thing, and a big improvement to performance.

"It's not a bug, it's a feature" ;-)

> Cyrille Henry wrote :
> 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.I didn't succeed

When I red your solution using framebuffer, Cyrille, I felt so sad...
I didn't understand why I didn't think about it before...

So I tried...
And I realized that my "out of the screen way" was a 
two-years-ago-hack-solution I used because I wasn't able to pix_record 
the output of the texture made by the framebuffer. (I was too lazy to 
post on the list, I guess)

But you give me the solution...
I have to pix_snap it...

So, now, it works. :-)
And it's simpler...

So I'm happy.

Thanks a lot.

01ivier

---
"On ne peut pas vivre dans un monde où l'on croit que l'élégance exquise 
du plumage de la pintade est inutile. Ceci est tout à fait à part. J'ai 
eu envie de le dire, je l'ai dit." Jean Giono, Un roi sans 
divertissement.

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.
> 
> cheers
> c
> 
>> 
>> Sorry if I'm fuzzy...
>> If questions, I'll try to explain better.
>> 
>> Thanks in advance for any help.
>> 
>> 01ivier
>> 
> 
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