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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
Download patch file Download diff file Expand all files Collapse all files

22
src/vid_cga.c
View file

@ -80,8 +80,9 @@ void cga_write(uint32_t addr, uint8_t val, void *p)
cga->vram[addr & 0x3fff] = val;
if (cga->snow_enabled)
{
cga->charbuffer[ ((int)(((cga->dispontime - cga->vidtime) * 2) / CGACONST)) & 0xfc] = val;
cga->charbuffer[(((int)(((cga->dispontime - cga->vidtime) * 2) / CGACONST)) & 0xfc) | 1] = val;
int offset = ((timer_get_remaining_u64(&cga->timer) / CGACONST) * 2) & 0xfc;
cga->charbuffer[offset] = cga->vram[addr & 0x3fff];
cga->charbuffer[offset | 1] = cga->vram[addr & 0x3fff];
}
egawrites++;
cycles -= 4;
@ -93,8 +94,9 @@ uint8_t cga_read(uint32_t addr, void *p)
cycles -= 4;
if (cga->snow_enabled)
{
cga->charbuffer[ ((int)(((cga->dispontime - cga->vidtime) * 2) / CGACONST)) & 0xfc] = cga->vram[addr & 0x3fff];
cga->charbuffer[(((int)(((cga->dispontime - cga->vidtime) * 2) / CGACONST)) & 0xfc) | 1] = cga->vram[addr & 0x3fff];
int offset = ((timer_get_remaining_u64(&cga->timer) / CGACONST) * 2) & 0xfc;
cga->charbuffer[offset] = cga->vram[addr & 0x3fff];
cga->charbuffer[offset | 1] = cga->vram[addr & 0x3fff];
}
egareads++;
// pclog("CGA_READ %04X\n", addr);
@ -121,8 +123,8 @@ void cga_recalctimings(cga_t *cga)
_dispontime *= CGACONST;
_dispofftime *= CGACONST;
// printf("Timings - on %f off %f frame %f second %f\n",dispontime,dispofftime,(dispontime+dispofftime)*262.0,(dispontime+dispofftime)*262.0*59.92);
cga->dispontime = (int)(_dispontime * (1 << TIMER_SHIFT));
cga->dispofftime = (int)(_dispofftime * (1 << TIMER_SHIFT));
cga->dispontime = (uint64_t)_dispontime;
cga->dispofftime = (uint64_t)_dispofftime;
}
void cga_poll(void *p)
@ -140,7 +142,7 @@ void cga_poll(void *p)
if (!cga->linepos)
{
cga->vidtime += cga->dispofftime;
timer_advance_u64(&cga->timer, cga->dispofftime);
cga->cgastat |= 1;
cga->linepos = 1;
oldsc = cga->sc;
@ -313,7 +315,7 @@ void cga_poll(void *p)
}
else
{
cga->vidtime += cga->dispontime;
timer_advance_u64(&cga->timer, cga->dispontime);
cga->linepos = 0;
if (cga->vsynctime)
{
@ -434,6 +436,7 @@ void cga_poll(void *p)
void cga_init(cga_t *cga)
{
timer_add(&cga->timer, cga_poll, cga, 1);
cga->composite = 0;
}
@ -452,7 +455,8 @@ void *cga_standalone_init()
cga->vram = malloc(0x4000);
cga_comp_init(cga->revision);
timer_add(cga_poll, &cga->vidtime, TIMER_ALWAYS_ENABLED, cga);
timer_add(&cga->timer, cga_poll, cga, 1);
mem_mapping_add(&cga->mapping, 0xb8000, 0x08000, cga_read, NULL, NULL, cga_write, NULL, NULL, NULL, MEM_MAPPING_EXTERNAL, cga);
io_sethandler(0x03d0, 0x0010, cga_in, NULL, NULL, cga_out, NULL, NULL, cga);