Wayland/weston question (launching weston app from tty)

[Pekka Paalanen]

On Thu, 23 Jan 2020 12:59:25 +0300
Alexey Kasyanchuk <degitx at gmail.com> wrote:

> Hi, could you please help me with wayland/weston question?
> 
> *Is it possible to start wayland client graphical app inside weston session
> from outside the weston somehow (tty, serial console, or boot)?*
> 
> Here the code
> 
>     display.display = wl_display_connect(NULL);
>     assert(display.display);
> 
>     EGLint major, minor;
>     display.egl.dpy = eglGetDisplay(display.display);
>     assert(display.egl.dpy);
> 
>     ret = eglInitialize(display.egl.dpy, &major, &minor);
>     assert(ret == EGL_TRUE);
> 
> If I tried to start from weston terminal or wayland session, I'm gettings
> proper result and eglInitialize() successful. But when I start it from tty
> or Xorg (weston on other tty), I'm getting eglInitialize assert fault.

Hi,

you need environment variables XDG_RUNTIME_DIR and WAYLAND_DISPLAY to
be set the same way as you have them in the working case.

See also the documentation of wl_display_connect().

> Pass EGL_DEFAULT_DISPLAY to eglGetDisplay make it proper initing but it not
> workable with app.

EGL_DEFAULT_DISPLAY on Wayland cannot ever meaningfully work by design.

Instead of eglGetDisplay(), I warmly recommend using these extensions
when available:

https://www.khronos.org/registry/EGL/extensions/EXT/EGL_EXT_platform_base.txt
https://www.khronos.org/registry/EGL/extensions/EXT/EGL_EXT_platform_wayland.txt

or

https://www.khronos.org/registry/EGL/extensions/KHR/EGL_KHR_platform_wayland.txt


Thanks,
pq
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