[vlc-devel] Using VLC 4.0.0 on WSL2 Ubuntu 25.04 with wayland

[Jean-Yves Baudy]

Thanks for the tips. I have updated mesa to the same version mentioned in
your mail.

   - https://launchpad.net/ubuntu/+source/mesa

weston-simple-egl works fine. So  EGL is usable. But vlc still failed to
use EGL. I see this log:

[00007ae40404cc40] xcb_egl gl debug: EGL client extensions:
EGL_EXT_device_base EGL_EXT_device_enumeration EGL_EXT_device_query
EGL_EXT_platform_base EGL_KHR_client_get_all_proc_addresses
EGL_EXT_client_extensions EGL_KHR_debug EGL_EXT_platform_device
EGL_EXT_explicit_device EGL_EXT_platform_wayland EGL_KHR_platform_wayland
EGL_EXT_platform_x11 EGL_KHR_platform_x11 EGL_EXT_platform_xcb
EGL_MESA_platform_gbm EGL_KHR_platform_gbm EGL_MESA_platform_surfaceless
[00007ae40404cc40] egl_wl gl debug: EGL client extensions:
EGL_EXT_device_base EGL_EXT_device_enumeration EGL_EXT_device_query
EGL_EXT_platform_base EGL_KHR_client_get_all_proc_addresses
EGL_EXT_client_extensions EGL_KHR_debug EGL_EXT_platform_device
EGL_EXT_explicit_device EGL_EXT_platform_wayland EGL_KHR_platform_wayland
EGL_EXT_platform_x11 EGL_KHR_platform_x11 EGL_EXT_platform_xcb
EGL_MESA_platform_gbm EGL_KHR_platform_gbm EGL_MESA_platform_surfaceless
*[00007ae40404cc40] egl_wl gl warning: EGL display reference counting not
supported*
[00007ae40404cc40] egl_x11 gl debug: EGL client extensions:
EGL_EXT_device_base EGL_EXT_device_enumeration EGL_EXT_device_query
EGL_EXT_platform_base EGL_KHR_client_get_all_proc_addresses
EGL_EXT_client_extensions EGL_KHR_debug EGL_EXT_platform_device
EGL_EXT_explicit_device EGL_EXT_platform_wayland EGL_KHR_platform_wayland
EGL_EXT_platform_x11 EGL_KHR_platform_x11 EGL_EXT_platform_xcb
EGL_MESA_platform_gbm EGL_KHR_platform_gbm EGL_MESA_platform_surfaceless
[00007ae40404cc40] egl_gbm_wl gl debug: EGL client extensions:
EGL_EXT_device_base EGL_EXT_device_enumeration EGL_EXT_device_query
EGL_EXT_platform_base EGL_KHR_client_get_all_proc_addresses
EGL_EXT_client_extensions EGL_KHR_debug EGL_EXT_platform_device
EGL_EXT_explicit_device EGL_EXT_platform_wayland EGL_KHR_platform_wayland
EGL_EXT_platform_x11 EGL_KHR_platform_x11 EGL_EXT_platform_xcb
EGL_MESA_platform_gbm EGL_KHR_platform_gbm EGL_MESA_platform_surfaceless
[00007ae40404cc40] egl_gbm_wl gl: can't find gbm device
[00007ae468ff5888] main generic debug: no opengl modules matched with name
any
[00007ae40404c8f0] main vout display debug: no vout display modules matched
with name gl
[00007ae43c0458a0] main video output error: video output display creation
failed


This line  [00007ae40404cc40] egl_wl gl warning: EGL display reference
counting not supported may explain why. Code is
in ./modules/video_output/opengl/egl.c

    if (!CheckClientExt("EGL_KHR_display_reference")) {
        msg_Warn(gl, "EGL display reference counting not supported");
        return EGL_NO_DISPLAY;
    }

Maybe due to my hardware....




Le mer. 25 juin 2025 à 21:35, Fatih Uzunoğlu <fuzun54 at outlook.com> a écrit :

> The problem is within VLC, mainly two components are using something that
> seemingly can only be used by one. This is only the case with fractional
> scale, because Wayland does not support fractional scale by default and
> fractional scale requires adjusting viewport...
>
> In your case, as I said, if you are looking for a workaround, OpenGL
> should be functional in WSL and you may want to try again after making sure
> it is working so that SHM module, which is lower priority, is not used:
>
> > If you are using Ubuntu, Debian tends to dissect monorepos for
> > packaging. Maybe you can try again to not rely on SHM after installing
> > these packages listed here: https://packages.debian.org/source/sid/mesa.
> > Depending on the modules, it may also require re-configuration.
>
> If you have Weston, you can check running `weston-simple-egl` to see if
> EGL is usable.
>
> That being said, it is still not clear to me how this is going to be
> fixed. Reporting size as `size * scale` is neither conventional (in Wayland
> conventions at least, not VLC conventions) nor would work as intended.
> Wayland applications use `wl_surface_set_buffer_scale()` for integer scale,
> and viewporter for fractional scale. This is what we are doing in the
> interface window provider.
> _______________________________________________
> vlc-devel mailing list
> To unsubscribe or modify your subscription options:
> https://mailman.videolan.org/listinfo/vlc-devel
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://mailman.videolan.org/pipermail/vlc-devel/attachments/20250626/3b721204/attachment.htm>