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ps2, kludge for timer bugs in ps2sdk

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kub 2024-02-14 23:42:50 +01:00
parent 3eb1d64585
commit dedf7fa7d5
1 changed files with 26 additions and 4 deletions
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30
platform/ps2/plat.c
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@ -134,16 +134,38 @@ unsigned int plat_get_ticks_us(void)
return ret;
}
/* sleep for some time in ms */
void plat_sleep_ms(int ms)
/* Unfortunately the SetTimerAlarm function in ps2sdk has a bug which makes it
* waiting much too long in some cases. For now, replaced by SetAlarm and a
* polling loop with RotateThreadReadyQueue for yielding to other threads.
*/
static void alarm_cb(int id, unsigned short time, void *arg)
{
usleep(ms * 1000);
iWakeupThread((s32)arg);
}
/* sleep for some time in us */
void plat_wait_till_us(unsigned int us_to)
{
usleep(us_to - plat_get_ticks_us());
// TODO hsync depends on NTSC/PAL (15750/15625 Hz), it however doesn't
// matter if it falls a bit short, the while loop will catch the rest
unsigned hsyncs = (us_to - plat_get_ticks_us()) * 15620 / 1000000;
if (hsyncs && SetAlarm(hsyncs, alarm_cb, (void *)GetThreadId()) >= 0)
SleepThread();
while ((int)(us_to - plat_get_ticks_us()) > 0)
RotateThreadReadyQueue(0);
// unsigned int ticks = plat_get_ticks_us();
// if ((int)(us_to - ticks) > 0)
// usleep(us_to - ticks);
}
/* sleep for some time in ms */
void plat_sleep_ms(int ms)
{
plat_wait_till_us(plat_get_ticks_us() + ms*1000);
// usleep(ms * 1000);
}
/* wait until some event occurs, or timeout */