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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_t1000.c
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@ -13,6 +13,9 @@
#define T1000_XSIZE 640
#define T1000_YSIZE 200
/*Very rough estimate*/
#define VID_CLOCK (double)(651 * 216 * 60)
/* Mapping of attributes to colours */
static uint32_t blue, grey;
static uint8_t boldcols[256]; /* Which attributes use the bold font */
@ -65,7 +68,7 @@ typedef struct t1000_t
int internal; /* Using internal display? */
uint8_t attrmap; /* Attribute mapping register */
int dispontime, dispofftime;
uint64_t dispontime, dispofftime;
int linepos, displine;
int vc;
@ -176,8 +179,8 @@ static void t1000_recalctimings(t1000_t *t1000)
disptime = 651;
_dispontime = 640;
_dispofftime = disptime - _dispontime;
t1000->dispontime = (int)(_dispontime * (1 << TIMER_SHIFT));
t1000->dispofftime = (int)(_dispofftime * (1 << TIMER_SHIFT));
t1000->dispontime = (uint64_t)(_dispontime * (cpuclock / VID_CLOCK) * (double)(1ull << 32));
t1000->dispofftime = (uint64_t)(_dispofftime * (cpuclock / VID_CLOCK) * (double)(1ull << 32));
}
/* Draw a row of text in 80-column mode */
@ -446,7 +449,7 @@ static void t1000_poll(void *p)
if (!t1000->linepos)
{
t1000->cga.vidtime += t1000->dispofftime;
timer_advance_u64(&t1000->cga.timer, t1000->dispofftime);
t1000->cga.cgastat |= 1;
t1000->linepos = 1;
if (t1000->dispon)
@ -493,7 +496,7 @@ static void t1000_poll(void *p)
{
t1000->cga.cgastat &= ~1;
}
t1000->cga.vidtime += t1000->dispontime;
timer_advance_u64(&t1000->cga.timer, t1000->dispontime);
t1000->linepos = 0;
if (t1000->displine == 200)
@ -635,7 +638,8 @@ static void *t1000_init()
/* 16k video RAM */
t1000->vram = malloc(0x4000);
timer_add(t1000_poll, &t1000->cga.vidtime, TIMER_ALWAYS_ENABLED, t1000);
timer_set_callback(&t1000->cga.timer, t1000_poll);
timer_set_p(&t1000->cga.timer, t1000);
/* Occupy memory between 0xB8000 and 0xBFFFF */
mem_mapping_add(&t1000->mapping, 0xb8000, 0x8000, t1000_read, NULL, NULL, t1000_write, NULL, NULL, NULL, 0, t1000);