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windows: Fix underflow before delay_usec

This commit is contained in:
Ross Rothenstine 2024-11-30 02:30:05 -08:00
parent 1f47e4c4e3
commit 35faf99755
1 changed files with 8 additions and 3 deletions
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11
platform/windows/os_windows.cpp
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@ -2278,9 +2278,14 @@ void OS_Windows::add_frame_delay(bool p_can_draw) {
target_ticks += dynamic_delay;
uint64_t current_ticks = get_ticks_usec();
// The minimum sleep resolution on windows is 1 ms on most systems.
if (current_ticks < (target_ticks - delay_resolution)) {
delay_usec((target_ticks - delay_resolution) - current_ticks);
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.
// Refer to: https://learn.microsoft.com/en-us/windows/win32/api/synchapi/nf-synchapi-sleep#remarks
delay_time = (delay_time / delay_resolution) * delay_resolution;
if (delay_time > 0) {
delay_usec(delay_time);
}
}
// Busy wait for the remainder of time.
while (get_ticks_usec() < target_ticks) {