[wpe-webkit] imx6 backend "no default display support on wayland"

[Seuntjens, Jonas]

Hi

I am trying to get webkit working on an i.mx6 Quad following the very clear guidelines on:
https://github.com/Igalia/meta-webkit/wiki/WPE
https://github.com/Igalia/meta-webkit/wiki/i.MX6

I am able to do a complete build and have a working cog browser with wayland backend.
However it seems that the performance is not completely what we expected. That is why we tried to build wpe-webkit with the i.mx6 backend which would render the full-screen directly to the framebuffers using the Vivante driver.
This build completed but when I try to start the cog browser I get following error message:

Initialization of linux input system succeeded.
EGL: Warning: No default display support on wayland
PlatformDisplayWPE: could not create the EGL display: EGL_SUCCESS
** (WPEWebProcess:1056): CRITITCAL **: gst_gl_display_egl_new_with_egl_display" assertion 'display != NULL' failed
Cannot create EGL sharing context: invalid display (last error: EGL_SUCCESS)

Build is using  Rocko Release 01 - 4.9.11.
We also tried to run the cog browser directly from the command line (no wayland active) but we still have the same error.

Do you have any idea what could be wrong here?

Kind regards
Jonas
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