URL:
<http://gna.org/bugs/?21883>
Summary: Extremely jerky motion when clearing fog
Project: Battle for Wesnoth
Submitted by: mattsc
Submitted on: Tue 01 Apr 2014 05:37:29 PM UTC
Category: Bug
Severity: 4 - Important
Priority: 5 - Normal
Item Group: Graphics
Status: None
Privacy: Public
Assigned to: None
Originator Email:
Open/Closed: Open
Discussion Lock: Any
Release: 1.11.12+dev
Operating System: OS X 10.9
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Details:
Since on-the-fly fog clearing was introduced, unit movement animations can be
very jerky in OS X. This does not only result in stop-and-go motion, but in
the units jumping back and forth between hexes erratically.
An extreme case is captured in this video
<https://www.dropbox.com/s/f5ik4egkkr28cx1/WN_jerky_movement.mov>. (It's 4MB
and with that too large for an attachment.)
This only happens when the map is fogged (yes, fog was on in that video, it
just doesn't show for a technical reason) and it is worse when map, idle and
standing animations are enabled in the preferences, as well as when other
processes take up CPU time.
It happens in both windowed and fullscreen mode, and in normal speed and
accelerated speed. It also happens for both debug and release builds.
This seems to happen on OS X even on medium-fast systems because
of the way how the framebuffer is handled on Macs (or something like that, I
don't understand those issues very well). However, it has been reproduced on
Linux using 'cpulimit -2'. It is therefore likely an issue at least for slow
systems with other OSs as well.
To reproduce:
- Start first scenario of Heir to the Throne
- Type :debug and :fog (to turn on fog)
- Recruit a couple fighters and end the turn
- On turn 2, move the fighters so that they clear as many fogged hexes as
possible
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<http://gna.org/bugs/?21883>
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