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Use more efficient sleep approach on Windows when low-processor mode is enabled

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This aims to fix the idle CPU utilization regression from 4.3 to 4.4
by reverting to the previous approach, but only when low-processor mode
is enabled.

(cherry picked from commit 03b4e0dd58)
This commit is contained in:
Hugo Locurcio
2025-03-07 18:06:41 +01:00
committed by Rémi Verschelde
parent ccb325f0bc
commit 40e3cec9e0
1 changed files with 19 additions and 11 deletions
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8
platform/windows/os_windows.cpp
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@ -2340,6 +2340,7 @@ void OS_Windows::add_frame_delay(bool p_can_draw) {
target_ticks += dynamic_delay;
uint64_t current_ticks = get_ticks_usec();
if (!is_in_low_processor_usage_mode()) {
if (target_ticks > current_ticks + delay_resolution) {
uint64_t delay_time = target_ticks - current_ticks - delay_resolution;
// Make sure we always sleep for a multiple of delay_resolution to avoid overshooting.
@ -2353,6 +2354,13 @@ void OS_Windows::add_frame_delay(bool p_can_draw) {
while (get_ticks_usec() < target_ticks) {
YieldProcessor();
}
} else {
// Use a more relaxed approach for low processor usage mode.
// This has worse frame pacing but is more power efficient.
if (current_ticks < target_ticks) {
delay_usec(target_ticks - current_ticks);
}
}
current_ticks = get_ticks_usec();
target_ticks = MIN(MAX(target_ticks, current_ticks - dynamic_delay), current_ticks + dynamic_delay);