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SVGA now handles vblank start < vertical total. Fixes The Incredible Machine.

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This commit is contained in:
TomW 2014-03-09 11:24:58 +00:00
commit 4c4b3df51f
2 changed files with 9 additions and 1 deletions
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8
src/vid_svga.c
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@ -246,6 +246,7 @@ void svga_recalctimings(svga_t *svga)
svga->dispend = svga->crtc[0x12];
svga->vsyncstart = svga->crtc[0x10];
svga->split = svga->crtc[0x18];
svga->vblankstart = svga->crtc[0x15];
if (svga->crtc[7] & 1) svga->vtotal |= 0x100;
if (svga->crtc[7] & 32) svga->vtotal |= 0x200;
@ -262,6 +263,13 @@ void svga_recalctimings(svga_t *svga)
if (svga->crtc[7] & 0x10) svga->split|=0x100;
if (svga->crtc[9] & 0x40) svga->split|=0x200;
svga->split++;
if (svga->crtc[7] & 0x08) svga->vblankstart |= 0x100;
if (svga->crtc[9] & 0x20) svga->vblankstart |= 0x200;
svga->vblankstart++;
if (svga->vblankstart < svga->dispend)
svga->dispend = svga->vblankstart;
svga->hdisp = svga->crtc[1];
svga->hdisp++;