[RFC][PATCH xserver] Multi-buffered flips on subsurfaces seg fault in Mesa

[Roman Gilg]

Sorry, somewhat part of my message got removed. It should begin with:

"This is a RFC on a follow-up patch to my recently posted patch series on
the
xorg-devel mailing list to enable per window flips of Present Pixmaps to
Wayland surfaces:
https://lists.freedesktop.org/archives/xorg-devel/2018-January/055674.html

The above patch series only allows flips..."

and so on.

On Mon, Jan 29, 2018 at 5:54 PM, Roman Gilg <subdiff at gmail.com> wrote:

> The above patch series only allows flips on a child window with the same
> dimensions as its parent xwl_window. For flips on child windows (for
> example
> the video view port of a video player in windowed mode, see here:
> http://www.subdiff.de/assets/images/2017-07-28-a-new-beginning.jpg) I
> wanted
> to use Wayland subsurfaces as in the attached patch.
>
> The flipping itself works well on Weston and on KWin. But when shutting
> down
> KWin in the end I get always a segmentation fault in Mesa when cleaning up
> EGL
> via eglTerminate(EGLDisplay) through libepoxy.
>
> I pinpointed the seg fault to be a missing destroyImage function pointer
> here:
> https://cgit.freedesktop.org/mesa/mesa/tree/src/egl/
> drivers/dri2/egl_dri2.c#n2685
>
> But I don't see currently what component is making the problems here or if
> the
> problem lies in my code.
>
>
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