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core, fix race condition when waiting for vsync

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This commit is contained in:
kub 2021-06-28 21:58:01 +02:00
parent e704c9b913
commit 3368c27707
1 changed files with 3 additions and 2 deletions
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5
platform/common/emu.c
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@ -1358,6 +1358,7 @@ static void emu_loop_prep(void)
/* our tick here is 1 us right now */ /* our tick here is 1 us right now */
#define ms_to_ticks(x) (unsigned int)(x * 1000) #define ms_to_ticks(x) (unsigned int)(x * 1000)
#define get_ticks() plat_get_ticks_us() #define get_ticks() plat_get_ticks_us()
#define vsync_delay_x3 3*ms_to_ticks(1)
void emu_loop(void) void emu_loop(void)
{ {
@ -1512,13 +1513,13 @@ void emu_loop(void)
diff = timestamp_aim_x3 - timestamp * 3; diff = timestamp_aim_x3 - timestamp * 3;
// sleep or vsync if we are still too fast // sleep or vsync if we are still too fast
if (diff > target_frametime_x3 && (currentConfig.EmuOpt & EOPT_VSYNC)) { if (diff > target_frametime_x3 + vsync_delay_x3 && (currentConfig.EmuOpt & EOPT_VSYNC)) {
// we are too fast // we are too fast
plat_video_wait_vsync(); plat_video_wait_vsync();
timestamp = get_ticks(); timestamp = get_ticks();
diff = timestamp * 3 - timestamp_aim_x3; diff = timestamp * 3 - timestamp_aim_x3;
} }
if (diff > target_frametime_x3) { if (diff > target_frametime_x3 + vsync_delay_x3) {
// still too fast // still too fast
plat_wait_till_us(timestamp + (diff - target_frametime_x3) / 3); plat_wait_till_us(timestamp + (diff - target_frametime_x3) / 3);
} }