diff options
| author | Frank Richter <[email protected]> | 2017-08-14 16:05:22 +0200 |
|---|---|---|
| committer | Emil Velikov <[email protected]> | 2017-08-19 01:46:08 +0100 |
| commit | e452ed26ff2272d12e1b8c435cb4fc24949627ff (patch) | |
| tree | 8cff78b091871e5e5efcabdd32e970f45c4d2ef6 | |
| parent | c7c6ba44ca50a2ff7a6cbb0bdf48c03fab323eaf (diff) | |
st/wgl: check for negative delta in wait_swap_interval()
This can happen because of rollover. See bug report for details.
Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=102241
Cc: [email protected]
Reviewed-by: Brian Paul <[email protected]>
Reviewed-by: Jose Fonseca <[email protected]>
(cherry picked from commit d90e05ad487e9fe7e17c293814ac8549d9d686d8)
| -rw-r--r-- | src/gallium/state_trackers/wgl/stw_framebuffer.c | 7 |
1 files changed, 5 insertions, 2 deletions
diff --git a/src/gallium/state_trackers/wgl/stw_framebuffer.c b/src/gallium/state_trackers/wgl/stw_framebuffer.c index 321fbb6ea77..06b5c8da3c2 100644 --- a/src/gallium/state_trackers/wgl/stw_framebuffer.c +++ b/src/gallium/state_trackers/wgl/stw_framebuffer.c @@ -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); |