[Wayland-bugs] [Bug 72612] weston-subsurfaces does not render/display

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=72612

--- Comment #5 from Pekka Paalanen <ppaalanen at gmail.com> ---
The triangle code sets up its own frame callback to "independently" drive the
animation.

There should not be a secret cairo EGL surface for the triangle widget. If
there is, I think that should be fixed first. I guess it just hasn't been an
issue until now.

The interactions and deadlock avoidance with EGL vs. synchronized sub-surfaces
has always been delicate. First it was only the frame callback, but now you
have the wl_buffer.releases as well.

I believe it is a fact, that synchronized sub-surfaces will require one more
buffer in the rotation than what a normal surface does, at least if they run
"independently". The interactions are hard to follow, unfortunately.

I think I have assumed, that eglSwapInterval(0) would cause the EGL
implementation to never stall indefinitely, but is that a feasible assumption?

Btw. how about --with-cairo=image?

I am using --with-cairo=image, so that's another possible reason why I might
never see the problem.

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