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st/wgl: check for negative delta in wait_swap_interval()

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This can happen because of rollover.  See bug report for details.

Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=102241
Cc: mesa-stable@lists.freedesktop.org
Reviewed-by: Brian Paul <brianp@vmware.com>
Reviewed-by: Jose Fonseca <jfonseca@vmware.com>
(cherry picked from commit d90e05ad48)
This commit is contained in:
Frank Richter 2017-08-14 16:05:22 +02:00 • committed by Emil Velikov
parent c7c6ba44ca
commit e452ed26ff
1 changed files with 5 additions and 2 deletions
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7
src/gallium/state_trackers/wgl/stw_framebuffer.c
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@ -601,8 +601,11 @@ wait_swap_interval(struct stw_framebuffer *fb)
int64_t min_swap_period =
1.0e6 / stw_dev->refresh_rate * stw_dev->swap_interval;
/* if time since last swap is less than wait period, wait */
if (delta < min_swap_period) {
/* If time since last swap is less than wait period, wait.
* Note that it's possible for the delta to be negative because of
* rollover. See https://bugs.freedesktop.org/show_bug.cgi?id=102241
*/
if ((delta >= 0) && (delta < min_swap_period)) {
float fudge = 1.75f; /* emperical fudge factor */
int64_t wait = (min_swap_period - delta) * fudge;
os_time_sleep(wait);