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Mystique: Only update maback, the change will take place at the next retrace.

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OBattler
2023-12-22 11:45:46 +01:00
parent 799a9aa883
commit 816bc6f559
1 changed files with 12 additions and 0 deletions
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12
src/video/vid_mga.c
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@@ -886,6 +886,7 @@ mystique_recalctimings(svga_t *svga)
if (mystique->type >= MGA_1064SG) { if (mystique->type >= MGA_1064SG) {
/*Mystique, unlike most SVGA cards, allows display start to take /*Mystique, unlike most SVGA cards, allows display start to take
effect mid-screen*/ effect mid-screen*/
#ifdef CHANGE_MA
if (svga->ma_latch != mystique->ma_latch_old) { if (svga->ma_latch != mystique->ma_latch_old) {
if (svga->interlace && svga->oddeven) if (svga->interlace && svga->oddeven)
svga->ma = svga->maback = (svga->maback - (mystique->ma_latch_old << 2)) + (svga->ma_latch << 2) + (svga->rowoffset << 1); svga->ma = svga->maback = (svga->maback - (mystique->ma_latch_old << 2)) + (svga->ma_latch << 2) + (svga->rowoffset << 1);
@@ -893,6 +894,17 @@ mystique_recalctimings(svga_t *svga)
svga->ma = svga->maback = (svga->maback - (mystique->ma_latch_old << 2)) + (svga->ma_latch << 2); svga->ma = svga->maback = (svga->maback - (mystique->ma_latch_old << 2)) + (svga->ma_latch << 2);
mystique->ma_latch_old = svga->ma_latch; mystique->ma_latch_old = svga->ma_latch;
} }
#else
/* Only change maback so the new display start will take effect on the next
horizontal retrace. */
if (svga->ma_latch != mystique->ma_latch_old) {
if (svga->interlace && svga->oddeven)
svga->maback = (svga->maback - (mystique->ma_latch_old << 2)) + (svga->ma_latch << 2) + (svga->rowoffset << 1);
else
svga->maback = (svga->maback - (mystique->ma_latch_old << 2)) + (svga->ma_latch << 2);
mystique->ma_latch_old = svga->ma_latch;
}
#endif
svga->rowoffset <<= 1; svga->rowoffset <<= 1;
switch (mystique->xmulctrl & XMULCTRL_DEPTH_MASK) { switch (mystique->xmulctrl & XMULCTRL_DEPTH_MASK) {