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More horizontal blanking calculation fixes (and actually use blank start, not retrace start), fixes graphics cut-off on Voodoo on Windows 98 SE.

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OBattler
2024-01-13 00:41:45 +01:00
parent 38ef7fa1c3
commit ca4f5bad13
10 changed files with 76 additions and 39 deletions
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4
src/video/vid_s3.c
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@@ -3988,7 +3988,7 @@ s3_recalctimings(svga_t *svga)
svga->dots_per_clock = ((svga->seqregs[1] & 1) ? 16 : 18);
}
svga->hblankstart = (((svga->crtc[0x5d] & 0x10) >> 4) << 8) + svga->crtc[4] + 1;
svga->hblankstart = (((svga->crtc[0x5d] & 0x10) >> 4) << 8) + svga->crtc[2] + 1;
if (svga->crtc[0x5d] & 0x04)
svga->hblankstart += 0x100;
@@ -4150,7 +4150,7 @@ s3_trio64v_recalctimings(svga_t *svga)
}
}
svga->hblankstart = (((svga->crtc[0x5d] & 0x10) >> 4) << 8) + svga->crtc[4] + 1;
svga->hblankstart = (((svga->crtc[0x5d] & 0x10) >> 4) << 8) + svga->crtc[2] + 1;
/* NOTE: The S3 Trio64V+ datasheet says this is bit 7, but then where is bit 6?
The datasheets for the pre-Trio64V+ cards say +64, which implies bit 6,