[PD] raspberry pi 3 with OpenGL

[Peter Venus]

Hej

i just chime in, playing around with a raspi3 and the openGL driver.

i second the statement, that the driver is pretty alpha, but it seems to 
work, if one tweeks the right screws.

on installing GEM:

i did not compile from hand, but used the GEM version, that comes with 
the pies add-software.
this provides the latest GEM stable, 0.93.3,
starting pd from the terminal with
pd -lib Gem


on activating the driver:
the process of activating the driver gave me some headaches.
- problem: flashing rainbow-square, solution: proper power supply, 2.5A! 
(i finally used a rasppi-branded one)

- problem: black screen after boot, when driver is activated, solution:

the problem doesnt seem to affect all users, so maybe it is related to 
the EDID-communications
of the different screens, at least thats a guess of some people.

i found, that some users overcame this problem by adding some 
information to /boot/cmdline.txt
(not to the /boot/config.txt)
basically defining the resolution of the pi.

found here(the comments to the release announcment):
https://www.raspberrypi.org/blog/another-new-raspbian-release/#comment-1253188

" Edward Pike says:
12th Feb 2016 at 6:05 pm 
<https://www.raspberrypi.org/blog/another-new-raspbian-release/#comment-1253188> 


HI

None of my hdmi settings worked in config.txt; I got the black screen.

HOWEVER, I put the video resolution as a kernel parameter and IT WORKED. 
Mine is as follows (note the video=..) parameter (it depends on the 
actual device of course).

pi at raspberrypi:/boot $ cat cmdline.txt
dwc_otg.lpm_enable=0 console=ttyAMA0,115200 console=tty1 
root=/dev/mmcblk0p2 rootfstype=ext4 elevator=deadline fsck.repair=yes 
rootwait video=1360×768"

with this added "video XXXXxYYYY" i was able to boot and use GEM
as i would have expected.
only thing is, when entering a lower resolution then the native 
resolution of the connected display device,
the screen is somehow divided and has colored pixels on the left.
so it is not exactly plug'n'play.

the other necessary setting, that is covered in most of the raspi-forums:
- set the GPU-Memory to 128mb via raspi-config

anyway, i happily use the extendedviewtoolkit for video mapping on a pie 
now,

a side note:
when using PD with the activated openGL driver, i can't see any 
patchcords anymore, except
if they are straight downwards. well, for the moment i can live with 
that, since i prepare the patches on a different machine.

maybe if i change the width of the patchcords to more than one pixel, i 
would be able to see them.
i will have a look into that on the weekend.

so far, my experience.
unluckily no guarantee it works for all the pies out there.

i will share my further findings with this list.


cheers, peter






On 2016-04-20 11:57, Antoine Rousseau wrote:
> From my (recent) experience, I would say that openGL is still very 
> 'alpha' on both pi2 and pi3 (blinking screen, buggy pd GUI missing 
> many objects...)
>
> So personally for current works I sticked to GLES, using 
> openframeworks through POF (https://github.com/Ant1r/ofxPof) ; I still 
> have to commit latest pofFilm fixes.
>
> No model nor light in POF yet though, sorry...
>
>
> 2016-04-19 18:50 GMT+02:00 Antoine Villeret 
> <antoine.villeret at gmail.com <mailto:antoine.villeret at gmail.com>>:
>
>     I build Gem from git on RPi 2 in the beginning of February and
>     wrote a report on this list
>     the build might work with RPi3 and is in Deken
>
>     +
>     a
>
>     --
>     do it yourself
>     http://antoine.villeret.free.fr
>
>     2016-04-19 17:38 GMT+02:00 Bastiaan van den Berg
>     <buzz at spacedout.nl <mailto:buzz at spacedout.nl>>:
>
>         You need to enable opengl first, as noted on ;
>
>         https://www.raspberrypi.org/forums/viewtopic.php?f=91&t=128464
>         ​
>         --
>         buZz
>
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> -- 
> Antoine Rousseau
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>
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