Chris Wilson 5ccd2825c7 glx: Precisely wait for the next vblank
Currently the code queries the current msc then tries to approximate the
value of the next msc satisfing the modulus 2 for when to wait. This
introduces some instability as the msc may tick over during the
roundtrip leading to a 32ms wait instead of a 16ms wait. This happens
often enough to cause jerky animations, and affect gnome-shell-perf-tool.

A simpler solution is just use a single roundtrip by using WaitForMsc to
ask the driver to compute the next vblank itself.

Cc: Owen W. Taylor <otaylor@fishsoup.net>
Cc: Robert Bragg <robert@linux.intel.com>
Reviewed-by: Robert Bragg <robert@sixbynine.org>
2015-02-04 19:31:40 +00:00
..
2014-11-17 15:49:20 +01:00
2014-11-17 15:49:20 +01:00