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Added SDL_DelayPrecise()

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SDL_DelayNS() now passes through to the high precision OS delay function, and SDL_DelayPrecise() tries to busy wait to get as close as possible to the desired wait time.

Fixes https://github.com/libsdl-org/SDL/issues/11141
This commit is contained in:
Sam Lantinga
2024-10-10 07:43:34 -07:00
parent 28a70a5b71
commit c8f5f6d47a
8 changed files with 53 additions and 4 deletions
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28
test/testtimer.c
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@@ -178,6 +178,34 @@ int main(int argc, char *argv[])
/* Wait for the results to be seen */
SDL_Delay(1 * 1000);
/* Check accuracy of nanosecond delay */
{
Uint64 desired_delay = SDL_NS_PER_SECOND / 60;
Uint64 actual_delay;
Uint64 total_overslept = 0;
start = SDL_GetTicksNS();
SDL_DelayNS(1);
now = SDL_GetTicksNS();
actual_delay = (now - start);
SDL_Log("Minimum nanosecond delay: %" SDL_PRIu64 " ns\n", actual_delay);
SDL_Log("Timing 100 frames at 60 FPS\n");
for (i = 0; i < 100; ++i) {
start = SDL_GetTicksNS();
SDL_DelayNS(desired_delay);
now = SDL_GetTicksNS();
actual_delay = (now - start);
if (actual_delay > desired_delay) {
total_overslept += (actual_delay - desired_delay);
}
}
SDL_Log("Overslept %.2f ms\n", (double)total_overslept / SDL_NS_PER_MS);
}
/* Wait for the results to be seen */
SDL_Delay(1 * 1000);
/* Check accuracy of precise delay */
{
Uint64 desired_delay = SDL_NS_PER_SECOND / 60;