private static void update_throttle(Atime emutime)
{
long real_delta_attoseconds;
long emu_delta_attoseconds;
long real_is_ahead_attoseconds;
long attoseconds_per_tick;
long ticks_per_second;
long target_ticks;
long diff_ticks;
ticks_per_second = Wintime.ticks_per_second;
attoseconds_per_tick = Attotime.ATTOSECONDS_PER_SECOND / ticks_per_second;
if (Mame.mame_is_paused())
{
throttle_emutime = Attotime.attotime_sub_attoseconds(emutime, Attotime.ATTOSECONDS_PER_SECOND / PAUSED_REFRESH_RATE);
throttle_realtime = throttle_emutime;
}
emu_delta_attoseconds = Attotime.attotime_to_attoseconds(Attotime.attotime_sub(emutime, throttle_emutime));
if (emu_delta_attoseconds < 0 || emu_delta_attoseconds > Attotime.ATTOSECONDS_PER_SECOND / 10)
{
goto resync;
}
diff_ticks = Wintime.osd_ticks() - throttle_last_ticks;
throttle_last_ticks += diff_ticks;
if (diff_ticks >= ticks_per_second)
{
goto resync;
}
real_delta_attoseconds = diff_ticks * attoseconds_per_tick;
throttle_emutime = emutime;
throttle_realtime = Attotime.attotime_add_attoseconds(throttle_realtime, real_delta_attoseconds);
throttle_history = (throttle_history << 1) | Convert.ToUInt32(emu_delta_attoseconds > real_delta_attoseconds);
real_is_ahead_attoseconds = Attotime.attotime_to_attoseconds(Attotime.attotime_sub(throttle_emutime, throttle_realtime));
if ((real_is_ahead_attoseconds < -Attotime.ATTOSECONDS_PER_SECOND / 10) || (real_is_ahead_attoseconds < 0 && popcount[throttle_history & 0xff] < 6))
{
goto resync;
}
if (real_is_ahead_attoseconds < 0)
{
return;
}
target_ticks = throttle_last_ticks + real_is_ahead_attoseconds / attoseconds_per_tick;
diff_ticks = throttle_until_ticks(target_ticks) - throttle_last_ticks;
throttle_last_ticks += diff_ticks;
throttle_realtime = Attotime.attotime_add_attoseconds(throttle_realtime, diff_ticks * attoseconds_per_tick);
return;
resync:
throttle_realtime = throttle_emutime = emutime;
}
