Use surfaceless context if necessary

The support for surfaceless context was disabled in commit
9cc97f0c63049a8076476acc89c875c9e240abfb, which says:
> Using surfaceless EGL surface on imx6 embedded device crashes webengine
> with backtrace in gpu driver.

It was added in commit bfcbdc3ab42880dc37ffa7174af96928ccf25f03, which
says:
> This patch is a port of commit 4b0cac9dfeebb73f21a11e10e6a2bc7bddbe889b
> in Chromium for Qt WebEngine.
> The based commit says:
> (snip)
> > the creation of a dummy offscreen surface. This would also enable
> > support for offscreen rendering on platforms (i.e Ozone-Wayland) which
> > donot support pbuffer surfaces.
>
> Some platforms supported by QPA, such as Mesa 3D DRI2 with drm and
> wayland backend also don't support pbuffer surfaces.

Considering those cases, this change enables surfaceless context only if
pseudo surfaceless context made of surface context is not available.

Change-Id: I015421ebbbc357d48313e09d4f7a0369bb956521
Reviewed-by: Allan Sandfeld Jensen <allan.jensen@qt.io>
Reviewed-by: Michal Klocek <michal.klocek@qt.io>

0 files changed, 0 insertions, 0 deletions