[ARM] use egl equivalent instead of gl [$5]

[Cody Garver]

This is blocking elementary OS being ported entirely to armhf

(05:04:34 AM) ricotz: pantheon-greeter must use some egl equivalent instead of gl when building on armhf

[Sergey "Shnatsel" Davidoff (shnatsel)]

Interestingly enough, Pantheon Greeter uses Clutter which runs on OpenGL ES and EGL just fine. Do we have a more detailed problem description? What about Gala?

[Cody Garver (codygarver)]

My personal build log http://pastebin.com/3vry1a4F

[Sergey "Shnatsel" Davidoff (shnatsel)]

Launchpad fails when you request package "gl" and says there's no such thing on ARM: https://launchpadlibrarian.net/148040543/buildlog_ubuntu-precise-armhf.pantheon-greeter_1.0.2-0~r207%2Bpkg22%2Br1~precise1_FAILEDTOBUILD.txt.gz

So I suspect Pantheon Greeter makes some direct GL calls bypassing Clutter abstraction layer.

[Raphael Isemann (teemperor)]

We use at least one GL call, the one with the texture size limit. I think we can remove it in the worst case as we are anyway downscaling to screen-size via the CPU before we render. At least i can remember it works without the call.

If there is some fancy trick to conditional compile some code-piece only on arm, that would be probably the best solution, but i have no idea how to achieve such a thing.

[Cameron Norman (cameronnemo)]

@teemperor I found this: http://sourceforge.net/p/predef/wiki/Architectures/. I am pretty sure you get ifdefs with Vala, no?

[Raphael Isemann (teemperor)]

@cameronnemo

Well, there are also ARM pc's with OpenGL according to shnatsel, so i think we just make a normal flag for make if people want to use the opengl thingy.

[memeka (mihailescu2m)]

as of 13/01/2015, both the GL code and without-gl branch compile on arm, but crash.
I'll try to geta log.

[memeka (mihailescu2m)]

Looks like the greeter exists with error because it cannot initialize Clutter:

if (init != Clutter.InitError.SUCCESS)
        error ("Clutter could not be intiailized");

I don't know why this happens, gala works OK with clutter and egl. My current workaround is to use gtk-greeter (which results in an empty X11 session), and add "gala --replace; sleep 1 ; plank & wingpanel &" to .xprofile => https://www.youtube.com/watch?v=mjDsKmP0thE

This is the lightdm output:

[+0.32s] DEBUG: Session pid=2748: Running command /usr/lib/lightdm/lightdm-greeter-session /usr/share/xgreeters/pantheon-greeter
[+0.32s] DEBUG: Creating shared data directory /var/lib/lightdm-data/lightdm
[+0.32s] DEBUG: Session pid=2748: Logging to /var/log/lightdm/x-0-greeter.log
[+0.34s] DEBUG: Activating VT 7
[+0.34s] DEBUG: Activating login1 session c2
[+1.11s] DEBUG: Session pid=2748: Greeter closed communication channel
[+1.11s] DEBUG: Session pid=2748: Exited with return value 0
[+1.11s] DEBUG: Seat: Session stopped
[+1.11s] DEBUG: Seat: Stopping; failed to start a greeter

and this is x-0-greeter.log:

(pantheon-greeter:2993): Clutter-CRITICAL **: Unable to initialize Clutter: Failed to connected to any renderer due to constraints
** (pantheon-greeter:2993): ERROR **: PantheonGreeter.vala:295: Clutter could not be intiailized

[Cody Garver (codygarver)]

I think the rewrite may have fixed this, I am able to compile for armhf. But I have not yet got my hardware in a state that I can test an actual GUI yet.

[memeka (mihailescu2m)]

The issue is still present.
Starting pantheon-greeter in an existing X11 instance (e.g. sudo xinit & pantheon-greeter ) works; using light-dm is not working (error is Clutter could not be initialized)