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Video throttling: Additive oversleeping

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Signed-off-by: Celelibi <celelibi@gmail.com>
This commit is contained in:
Celelibi 2019-02-10 19:35:52 +01:00 committed by Vas Crabb
parent bafa5a7886
commit 35b13ffab2
1 changed files with 7 additions and 3 deletions
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10
src/emu/video.cpp
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@ -1045,7 +1045,11 @@ osd_ticks_t video_manager::throttle_until_ticks(osd_ticks_t target_ticks)
while (current_ticks < target_ticks)
{
// compute how much time to sleep for, taking into account the average oversleep
osd_ticks_t const delta = (target_ticks - current_ticks) * 1000 / (1000 + m_average_oversleep);
osd_ticks_t delta = target_ticks - current_ticks;
if (delta > m_average_oversleep / 1000)
delta -= m_average_oversleep / 1000;
else
delta = 0;
// see if we can sleep
bool const slept = allowed_to_sleep && delta;
@ -1062,8 +1066,8 @@ osd_ticks_t video_manager::throttle_until_ticks(osd_ticks_t target_ticks)
osd_ticks_t const actual_ticks = new_ticks - current_ticks;
if (actual_ticks > delta)
{
// take 90% of the previous average plus 10% of the new value
osd_ticks_t const oversleep_milliticks = 1000 * (actual_ticks - delta) / delta;
// take 99% of the previous average plus 1% of the new value
osd_ticks_t const oversleep_milliticks = 1000 * (actual_ticks - delta);
m_average_oversleep = (m_average_oversleep * 99 + oversleep_milliticks) / 100;
if (LOG_THROTTLE)