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S3 ViRGE: Fix the LFB mappigs to operate in accordance with the documentation.

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Fix certain UVCONFIG-using games at 16 or 32 MB of machine RAM.
This commit is contained in:
Miran Grča
2025-10-01 17:45:48 +02:00
committed by GitHub
parent 8e482db009
commit fc506d02e1
1 changed files with 5 additions and 6 deletions
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11
src/video/vid_s3_virge.c
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@@ -1114,11 +1114,7 @@ s3_virge_updatemapping(virge_t *virge)
mem_mapping_set_addr(&svga->mapping, 0xa0000, 0x10000);
mem_mapping_disable(&virge->linear_mapping);
} else {
if ((virge->chip == S3_VIRGEVX) || (virge->chip == S3_TRIO3D2X))
virge->linear_base &= 0xfe000000;
else
virge->linear_base &= 0xfc000000;
virge->linear_base &= ~(virge->linear_size - 1);
mem_mapping_set_addr(&virge->linear_mapping, virge->linear_base, virge->linear_size);
}
svga->fb_only = 1;
@@ -5190,7 +5186,10 @@ s3_virge_pci_write(UNUSED(int func), int addr, uint8_t val, void *priv)
return;
case 0x13:
svga->crtc[0x59] = (virge->chip == S3_VIRGEVX || virge->chip == S3_TRIO3D2X) ? (val & 0xfe) : (val & 0xfc);
if (virge->chip == S3_VIRGEVX || virge->chip == S3_TRIO3D2X)
svga->crtc[0x59] = (svga->crtc[0x59] & 0x01) | (val & 0xfe);
else
svga->crtc[0x59] = (svga->crtc[0x59] & 0x03) | (val & 0xfc);
s3_virge_updatemapping(virge);
return;