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(S)VGA split screen now takes interlace, odd/even line, and skew into account, fixes the E-Ten Traditional Chinese DOS display driver on Trident graphics cards.

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OBattler
2020-10-09 13:41:20 +02:00
parent 9ef58461ec
commit 1556bc7442
1 changed files with 7 additions and 2 deletions
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9
src/video/vid_svga.c
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@@ -741,7 +741,12 @@ svga_poll(void *p)
ret = svga->line_compare(svga);
if (ret) {
svga->ma = svga->maback = 0;
if (svga->interlace && svga->oddeven)
svga->ma = svga->maback = (svga->rowoffset << 1) + ((svga->crtc[5] & 0x60) >> 5);
else
svga->ma = svga->maback = ((svga->crtc[5] & 0x60) >> 5);
svga->ma = (svga->ma << 2);
svga->maback = (svga->maback << 2);
svga->sc = 0;
if (svga->attrregs[0x10] & 0x20) {
svga->scrollcache = 0;
@@ -805,7 +810,7 @@ svga_poll(void *p)
changeframecount = svga->interlace ? 3 : 2;
svga->vslines = 0;
if (svga->interlace && svga->oddeven)
if (svga->interlace && svga->oddeven)
svga->ma = svga->maback = svga->ma_latch + (svga->rowoffset << 1) + ((svga->crtc[5] & 0x60) >> 5);
else
svga->ma = svga->maback = svga->ma_latch + ((svga->crtc[5] & 0x60) >> 5);