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Mystique fixes :

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- MGA mode disables all VGA data processing on reads / writes
- MGA mode forces 8 pixels per character
- DMAPAD acts as an ILOAD mirror during ILOAD operations, same as SRCx
- Handle signed X coordinates better in blit operations
- Add more MMIO registers
- Don't fatal on ILOAD reads when blitter not busy
Fixes Windows XP with Mystique.
This commit is contained in:
SarahW 2020-01-18 15:50:46 +00:00
commit b72aa2117b
3 changed files with 189 additions and 29 deletions
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5
src/vid_svga.c
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@ -418,13 +418,14 @@ void svga_recalctimings(svga_t *svga)
svga->linedbl = svga->crtc[9] & 0x80;
svga->rowcount = svga->crtc[9] & 31;
svga->char_width = (svga->seqregs[1] & 1) ? 8 : 9;
if (svga->recalctimings_ex)
svga->recalctimings_ex(svga);
if (svga->vblankstart < svga->dispend)
svga->dispend = svga->vblankstart;
crtcconst = (svga->seqregs[1] & 1) ? (svga->clock * 8.0) : (svga->clock * 9.0);
crtcconst = svga->clock * svga->char_width;
disptime = svga->htotal;
_dispontime = svga->hdisp_time;
@ -670,7 +671,7 @@ void svga_poll(void *p)
// pclog("%i %i %i\n", svga->video_res_x, svga->video_res_y, svga->lowres);
if (!(svga->gdcreg[6] & 1) && !(svga->attrregs[0x10] & 1)) /*Text mode*/
{
svga->video_res_x /= (svga->seqregs[1] & 1) ? 8 : 9;
svga->video_res_x /= svga->char_width;
svga->video_res_y /= (svga->crtc[9] & 31) + 1;
svga->video_bpp = 0;
}