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Rewrote timer code.

Browse source 
The new code is based on timestamps, rather than delays. This eliminates the
need to update every timer in timer_process(), which cost a non-trivial amount
of CPU time on low-end machines.

This involved changes to every user of the timer code, so this change almost
certainly introduces bugs.
This commit is contained in:
SarahW 2018-08-02 22:06:10 +01:00
commit a7d006b637
79 changed files with 1050 additions and 1033 deletions
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18
src/sound_ad1848.c
View file

@ -71,9 +71,19 @@ void ad1848_write(uint16_t addr, uint8_t val, void *p)
break;
case 9:
if (!ad1848->enable && (val & 0x41) == 0x01)
{
if (ad1848->timer_latch)
timer_advance_u64(&ad1848->timer, ad1848->timer_latch);
else
timer_advance_u64(&ad1848->timer, TIMER_USEC);
}
ad1848->enable = ((val & 0x41) == 0x01);
if (!ad1848->enable)
{
timer_disable(&ad1848->timer);
ad1848->out_l = ad1848->out_r = 0;
}
break;
case 12:
@ -93,7 +103,7 @@ void ad1848_write(uint16_t addr, uint8_t val, void *p)
void ad1848_speed_changed(ad1848_t *ad1848)
{
ad1848->timer_latch = (int)((double)TIMER_USEC * (1000000.0 / (double)ad1848->freq));
ad1848->timer_latch = (uint64_t)((double)TIMER_USEC * (1000000.0 / (double)ad1848->freq));
}
void ad1848_update(ad1848_t *ad1848)
@ -110,9 +120,9 @@ static void ad1848_poll(void *p)
ad1848_t *ad1848 = (ad1848_t *)p;
if (ad1848->timer_latch)
ad1848->timer_count += ad1848->timer_latch;
timer_advance_u64(&ad1848->timer, ad1848->timer_latch);
else
ad1848->timer_count = TIMER_USEC;
timer_advance_u64(&ad1848->timer, TIMER_USEC);
ad1848_update(ad1848);
@ -214,5 +224,5 @@ void ad1848_init(ad1848_t *ad1848)
// pclog("ad1848_vols %i = %f %i\n", c, attenuation, ad1848_vols[c]);
}
timer_add(ad1848_poll, &ad1848->timer_count, &ad1848->enable, ad1848);
timer_add(&ad1848->timer, ad1848_poll, ad1848, 0);
}