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S3 Trio: Fix blanking calculation.

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This commit is contained in:
OBattler
2024-02-03 22:52:41 +01:00
parent 91494bab97
commit 3cfb9edb88
1 changed files with 2 additions and 4 deletions
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6
src/video/vid_s3.c
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@@ -3273,10 +3273,8 @@ 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[2] + 1;
svga->hblankstart = (((svga->crtc[0x5d] & 0x04) >> 2) << 8) + svga->crtc[2] + 1;
if (svga->crtc[0x5d] & 0x04)
svga->hblankstart += 0x100;
if (s3->chip >= S3_VISION964) {
/* 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,
@@ -4191,7 +4189,7 @@ s3_trio64v_recalctimings(svga_t *svga)
/* Also make sure vertical blanking starts on display end. */
svga->vblankstart = svga->dispend;
} else {
svga->hblankstart = (((svga->crtc[0x5d] & 0x10) >> 4) << 8) + svga->crtc[2] + 1;
svga->hblankstart = (((svga->crtc[0x5d] & 0x04) >> 2) << 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,