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Various fixes to SDAC RAMDAC emulation. Fixes Paradise Bahamas 64 with Xfree86, UNIVBE RAMDAC detection, and probably others.

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This commit is contained in:
SarahW 2018-03-20 22:09:50 +00:00
commit fc7ac47954
3 changed files with 118 additions and 80 deletions
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12
src/vid_s3.c
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@ -801,7 +801,12 @@ void s3_out(uint16_t addr, uint8_t val, void *p)
if (s3->chip == S3_TRIO32 || s3->chip == S3_TRIO64)
svga_out(addr, val, svga);
else
sdac_ramdac_out(addr, val, &s3->ramdac, svga);
{
if ((svga->crtc[0x55] & 1) || (svga->crtc[0x43] & 2))
sdac_ramdac_out((addr & 3) | 4, val, &s3->ramdac, svga);
else
sdac_ramdac_out(addr & 3, val, &s3->ramdac, svga);
}
return;
case 0x3D4:
@ -938,7 +943,9 @@ uint8_t s3_in(uint16_t addr, void *p)
// pclog("Read RAMDAC %04X %04X:%04X\n", addr, CS, pc);
if (s3->chip == S3_TRIO32 || s3->chip == S3_TRIO64)
return svga_in(addr, svga);
return sdac_ramdac_in(addr, &s3->ramdac, svga);
if ((svga->crtc[0x55] & 1) || (svga->crtc[0x43] & 2))
return sdac_ramdac_in((addr & 3) | 4, &s3->ramdac, svga);
return sdac_ramdac_in(addr & 3, &s3->ramdac, svga);
case 0x3d4:
return svga->crtcreg;
@ -2291,6 +2298,7 @@ void *s3_bahamas64_init()
s3->getclock = sdac_getclock;
s3->getclock_p = &s3->ramdac;
sdac_init(&s3->ramdac);
return s3;
}