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ui: Migrate custom precise delay to SDL_DelayPrecise

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Matt Borgerson
2026-01-21 17:20:14 -07:00
committed by mborgerson
parent 18aba177e2
commit 4fafe755cb
1 changed files with 5 additions and 52 deletions
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ui/xemu.c
+5 -52
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@@ -97,7 +97,6 @@ void xb_surface_gl_create_texture(DisplaySurface *surface);
void xb_surface_gl_update_texture(DisplaySurface *surface, int x, int y, int w, int h);
void xb_surface_gl_destroy_texture(DisplaySurface *surface);
static void sleep_ns(int64_t ns);
static void process_key(struct xemu_console *scon, SDL_KeyboardEvent *ev);
static void gl_update(DisplayChangeListener *dcl, int x, int y, int w, int h);
static void gl_switch(DisplayChangeListener *dcl, DisplaySurface *new_surface);
@@ -1094,47 +1093,14 @@ static void gl_refresh(DisplayChangeListener *dcl)
bql_unlock();
qemu_mutex_unlock_main_loop();
/*
* Throttle to make sure swaps happen at 60Hz
*/
/* Throttle to 60Hz */
static int64_t last_update = 0;
int64_t deadline = last_update + 16666666;
#ifdef DEBUG_XEMU_C
int64_t sleep_acc = 0;
int64_t spin_acc = 0;
#endif
#ifndef _WIN32
const int64_t sleep_threshold = 2000000;
#else
const int64_t sleep_threshold = 250000;
#endif
while (1) {
int64_t now = qemu_clock_get_ns(QEMU_CLOCK_REALTIME);
int64_t time_remaining = deadline - now;
if (now < deadline) {
if (time_remaining > sleep_threshold) {
// Try to sleep until the until reaching the sleep threshold.
sleep_ns(time_remaining - sleep_threshold);
#ifdef DEBUG_XEMU_C
sleep_acc += qemu_clock_get_ns(QEMU_CLOCK_REALTIME)-now;
#endif
} else {
// Simply spin to avoid extra delays incurred with swapping to
// another process and back in the event of being within
// threshold to desired event.
#ifdef DEBUG_XEMU_C
spin_acc++;
#endif
}
} else {
DPRINTF("zzZz %g %ld\n", (double)sleep_acc/1000000.0, spin_acc);
last_update = now;
break;
}
int64_t now = qemu_clock_get_ns(QEMU_CLOCK_REALTIME);
if (now < deadline) {
SDL_DelayPrecise(deadline - now);
}
last_update = qemu_clock_get_ns(QEMU_CLOCK_REALTIME);
}
@@ -1180,19 +1146,6 @@ static void *call_qemu_main(void *opaque)
exit(status);
}
/* Note: only supports millisecond resolution on Windows */
static void sleep_ns(int64_t ns)
{
#ifndef _WIN32
struct timespec sleep_delay, rem_delay;
sleep_delay.tv_sec = ns / 1000000000LL;
sleep_delay.tv_nsec = ns % 1000000000LL;
nanosleep(&sleep_delay, &rem_delay);
#else
Sleep(ns / SCALE_MS);
#endif
}
#ifdef _WIN32
static const wchar_t *get_executable_name(void)
{