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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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16
src/vid_t3100e.c
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@ -13,6 +13,9 @@
#define T3100E_XSIZE 640
#define T3100E_YSIZE 400
/*Very rough estimate*/
#define VID_CLOCK (double)(651 * 416 * 60)
/* T3100e CRTC regs (from the ROM):
*
* Selecting a character height of 3 seems to be sufficient to convert the
@ -73,7 +76,7 @@ typedef struct t3100e_t
int internal; /* Using internal display? */
uint8_t attrmap; /* Attribute mapping register */
int dispontime, dispofftime;
uint64_t dispontime, dispofftime;
int linepos, displine;
int vc;
@ -186,8 +189,8 @@ void t3100e_recalctimings(t3100e_t *t3100e)
disptime = 651;
_dispontime = 640;
_dispofftime = disptime - _dispontime;
t3100e->dispontime = (int)(_dispontime * (1 << TIMER_SHIFT));
t3100e->dispofftime = (int)(_dispofftime * (1 << TIMER_SHIFT));
t3100e->dispontime = (uint64_t)(_dispontime * (cpuclock / VID_CLOCK) * (double)(1ull << 32));
t3100e->dispofftime = (uint64_t)(_dispofftime * (cpuclock / VID_CLOCK) * (double)(1ull << 32));
}
@ -481,7 +484,7 @@ void t3100e_poll(void *p)
if (!t3100e->linepos)
{
t3100e->cga.vidtime += t3100e->dispofftime;
timer_advance_u64(&t3100e->cga.timer, t3100e->dispofftime);
t3100e->cga.cgastat |= 1;
t3100e->linepos = 1;
if (t3100e->dispon)
@ -528,7 +531,7 @@ void t3100e_poll(void *p)
{
t3100e->cga.cgastat &= ~1;
}
t3100e->cga.vidtime += t3100e->dispontime;
timer_advance_u64(&t3100e->cga.timer, t3100e->dispontime);
t3100e->linepos = 0;
if (t3100e->displine == 400)
@ -672,7 +675,8 @@ void *t3100e_init()
/* 32k video RAM */
t3100e->vram = malloc(0x8000);
timer_add(t3100e_poll, &t3100e->cga.vidtime, TIMER_ALWAYS_ENABLED, t3100e);
timer_set_callback(&t3100e->cga.timer, t3100e_poll);
timer_set_p(&t3100e->cga.timer, t3100e);
/* Occupy memory between 0xB8000 and 0xBFFFF */
mem_mapping_add(&t3100e->mapping, 0xb8000, 0x8000, t3100e_read, NULL, NULL, t3100e_write, NULL, NULL, NULL, 0, t3100e);