[Wayland-bugs] [Bug 61675] [regression] Weston: fade animation / springs

bugzilla-daemon at freedesktop.org bugzilla-daemon at freedesktop.org
Tue Apr 9 23:14:35 PDT 2013


https://bugs.freedesktop.org/show_bug.cgi?id=61675

--- Comment #2 from Pekka Paalanen <ppaalanen at gmail.com> ---
I did not try to reproduce this problem, but I have guess: the spring
parameters used for the "fade" cause overshoot and ringing. This can be easily
observed in the spring simulation (provided I got it right):
http://cgit.collabora.com/git/user/pq/weston-spring.git/

AFAICT, the parameters in the simulation are already the same as used for
"fade" in Weston, so all you need to do is 'make', and look at the graph.

The curve starts from zero, shoots over to 1.2 or so, and returns to roughly
0.95, before finally stabilising towards 1.0 again, and finishing. I didn't
notice anything that would stop the animation, when it hits >=1.0 the first
time.

Martin, does this sound like a probable cause, or was it something else you
observed? Your description is not too clear on what you mean.

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