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Rewrote timer code.

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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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13
src/vid_tandy.c
View file

@ -37,7 +37,8 @@ typedef struct tandy_t
int vsynctime, vadj;
uint16_t ma, maback;
int dispontime, dispofftime, vidtime;
uint64_t dispontime, dispofftime;
pc_timer_t timer;
int firstline, lastline;
int composite;
@ -186,8 +187,8 @@ void tandy_recalctimings(tandy_t *tandy)
_dispofftime = disptime - _dispontime;
_dispontime *= CGACONST;
_dispofftime *= CGACONST;
tandy->dispontime = (int)(_dispontime * (1 << TIMER_SHIFT));
tandy->dispofftime = (int)(_dispofftime * (1 << TIMER_SHIFT));
tandy->dispontime = (uint64_t)_dispontime;
tandy->dispofftime = (uint64_t)_dispofftime;
}
@ -208,7 +209,7 @@ void tandy_poll(void *p)
{
// cgapal[0]=tandy->col&15;
// printf("Firstline %i Lastline %i tandy->displine %i\n",firstline,lastline,tandy->displine);
tandy->vidtime += tandy->dispofftime;
timer_advance_u64(&tandy->timer, tandy->dispofftime);
tandy->stat |= 1;
tandy->linepos = 1;
oldsc = tandy->sc;
@ -476,7 +477,7 @@ void tandy_poll(void *p)
}
else
{
tandy->vidtime += tandy->dispontime;
timer_advance_u64(&tandy->timer, tandy->dispontime);
if (tandy->dispon)
tandy->stat &= ~1;
tandy->linepos = 0;
@ -624,7 +625,7 @@ void *tandy_init()
tandy->memctrl = -1;
tandy->base = (mem_size - 128) * 1024;
timer_add(tandy_poll, &tandy->vidtime, TIMER_ALWAYS_ENABLED, tandy);
timer_add(&tandy->timer, tandy_poll, tandy, 1);
mem_mapping_add(&tandy->mapping, 0xb8000, 0x08000, tandy_read, NULL, NULL, tandy_write, NULL, NULL, NULL, 0, tandy);
mem_mapping_add(&tandy->ram_mapping, 0x80000, 0x20000, tandy_ram_read, NULL, NULL, tandy_ram_write, NULL, NULL, NULL, 0, tandy);
/*Base 128k mapping is controlled via port 0xA0, so we remove it from the main mapping*/