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more const, get rid of forced sleep (nw)

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This commit is contained in:
Vas Crabb 2017-08-02 03:33:02 +10:00
parent ecad41a8ec
commit a19a685621
1 changed files with 7 additions and 16 deletions
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23
src/emu/video.cpp
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@ -884,11 +884,7 @@ osd_ticks_t video_manager::throttle_until_ticks(osd_ticks_t target_ticks)
{
// we're allowed to sleep via the OSD code only if we're configured to do so
// and we're not frameskipping due to autoframeskip, or if we're paused
bool allowed_to_sleep = false;
if (machine().options().sleep() && (!effective_autoframeskip() || effective_frameskip() == 0))
allowed_to_sleep = true;
if (machine().paused())
allowed_to_sleep = true;
bool const allowed_to_sleep = (machine().options().sleep() && (!effective_autoframeskip() || effective_frameskip() == 0)) || machine().paused();
// loop until we reach our target
g_profiler.start(PROFILER_IDLE);
@ -896,30 +892,25 @@ 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 delta = (target_ticks - current_ticks) * 1000 / (1000 + m_average_oversleep);
if (!delta)
delta = 1;
osd_ticks_t const delta = (target_ticks - current_ticks) * 1000 / (1000 + m_average_oversleep);
// see if we can sleep
bool slept = false;
if (allowed_to_sleep)
{
bool const slept = allowed_to_sleep && delta;
if (slept)
osd_sleep(delta);
slept = true;
}
// read the new value
osd_ticks_t new_ticks = osd_ticks();
osd_ticks_t const new_ticks = osd_ticks();
// keep some metrics on the sleeping patterns of the OSD layer
if (slept)
{
// if we overslept, keep an average of the amount
osd_ticks_t actual_ticks = new_ticks - current_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 oversleep_milliticks = 1000 * (actual_ticks - delta) / delta;
osd_ticks_t const oversleep_milliticks = 1000 * (actual_ticks - delta) / delta;
m_average_oversleep = (m_average_oversleep * 99 + oversleep_milliticks) / 100;
if (LOG_THROTTLE)