'EGLPlatform' object has no attribute 'GLX'

[callegar]

Describe the bug

Using xpra 5.0.3 on arch/manjaro linux, with a wayland session I am noticing that the "session info" reports N/A wrt opengl. Trying to run xpra opengl I get:

error='EGLPlatform' object has no attribute 'GLX'
message='EGLPlatform' object has no attribute 'GLX'
success=False

is this expected? Cannot opengl be used with xwayland?

To Reproduce
Steps to reproduce the behavior:

1. xpra opengl

System Information (please complete the following information):

• Server OS: Manjaro linux
• Client OS: Manjaro linux
• Xpra Server Version 5.0.3 (built from source, distro ships 4.4.5)
• Xpra Client Version 5.0.3

Additional context

[totaam]

No, OpenGL on Wayland would require a rewrite in EGL.

[callegar]

Thanks for confirming my expectation.

One question, out of curiosity, in case you have time to respond. Wayland is EGL, but GLX applications appear to be supported in XWayland. Would it be possible to run the xpra client on wayland in X11 mode via XWayland to have it behave as it normally does on X11?

[totaam]

Would it be possible to run the xpra client on wayland in X11 mode via XWayland

It is:

GDK_BACKEND=x11 xpra attach

[callegar]

I had tried that, but even selecting the X11 backend, xpra opengl still fails. Is that normal?

[totaam]

@callegar

$ xpra --version
xpra v5.0.4-r29
$ GDK_BACKEND=x11 xpra opengl | egrep "success|vendor"
success=True
vendor=NVIDIA Corporation

[callegar]

Great thanks!

[callegar]

As a matter of fact:

GDK_BACKEND=x11 xpra opengl

does not work here. However

XDG_SESSION_TYPE=x11 xpra opengl

does. When XDG_SESSION_TYPE=wayland and GDK_BACKEND=x11 the former seems to win, when maybe it should be the other way round (according to the GTK docs the low-level thing should prevail).

Still I wonder: because Xpra is X11 why not always assuming X11 (at least on the server)? Is there any advantage in not doing so?

[totaam]

because Xpra is X11 why not...

@callegar Because it isn't.
On a wayland client desktop you can uninstall xpra-x11.

And soon with EGL: #2467

[callegar]

Nice to learn something new! And server side?

[totaam]

Server-side: seamless and desktop / monitor modes do require xpra-x11, but desktop portal does not. (shadowing wayland sessions).