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S3 wraparound fix.

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Just a quick fix for Commander Keen 4 EGA's flickering.
This commit is contained in:
TC1995
2023-12-18 14:01:38 +01:00
parent 394a62d880
commit 552740b2bd
1 changed files with 3 additions and 12 deletions
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15
src/video/vid_s3.c
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@@ -2576,17 +2576,11 @@ s3_out(uint16_t addr, uint8_t val, void *priv)
case 0x3C7:
case 0x3C8:
case 0x3C9:
if ((svga->crtc[0x55] & 0x03) == 0x00)
rs2 = !!(svga->crtc[0x43] & 0x02);
else
rs2 = (svga->crtc[0x55] & 0x01);
rs2 = (svga->crtc[0x55] & 0x01) || !!(svga->crtc[0x43] & 2);
if (s3->chip >= S3_TRIO32)
svga_out(addr, val, svga);
else if ((s3->chip == S3_VISION964 && s3->card_type != S3_ELSAWIN2KPROX_964) || (s3->chip == S3_86C928)) {
if (!(svga->crtc[0x45] & 0x20) || (s3->chip == S3_86C928))
rs3 = !!(svga->crtc[0x55] & 0x02);
else
rs3 = 0;
rs3 = !!(svga->crtc[0x55] & 0x02);
bt48x_ramdac_out(addr, rs2, rs3, val, svga->ramdac, svga);
} else if ((s3->chip == S3_VISION964 && s3->card_type == S3_ELSAWIN2KPROX_964) || (s3->chip == S3_VISION968 && (s3->card_type == S3_ELSAWIN2KPROX || s3->card_type == S3_PHOENIX_VISION968 || s3->card_type == S3_NUMBER9_9FX_771)))
ibm_rgb528_ramdac_out(addr, rs2, val, svga->ramdac, svga);
@@ -2633,10 +2627,7 @@ s3_out(uint16_t addr, uint8_t val, void *priv)
svga->force_dword_mode = !!(val & 0x08);
break;
case 0x32:
if ((svga->crtc[0x31] & 0x30) && (svga->crtc[0x51] & 0x01) && (val & 0x40))
svga->vram_display_mask = 0x3ffff;
else
svga->vram_display_mask = s3->vram_mask;
svga->vram_display_mask = (val & 0x40) ? 0x3ffff : s3->vram_mask;
break;
case 0x40: