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Bochs SVGA: Buffer window switching now works properly

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This commit is contained in:
Cacodemon345
2025-04-07 01:01:26 +06:00
parent 375590b93b
commit 06bacb6912
1 changed files with 7 additions and 22 deletions
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29
src/video/vid_bochs_vbe.c
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@@ -338,20 +338,13 @@ bochs_vbe_recalctimings(svga_t* svga)
svga->rowoffset = (dev->vbe_regs[VBE_DISPI_INDEX_VIRT_WIDTH] / 2) >> 3;
svga->ma_latch = (dev->vbe_regs[VBE_DISPI_INDEX_Y_OFFSET] * svga->rowoffset) +
(dev->vbe_regs[VBE_DISPI_INDEX_X_OFFSET] >> 3);
svga->fullchange = 3;
} else {
svga->rowoffset = dev->vbe_regs[VBE_DISPI_INDEX_VIRT_WIDTH] * ((svga->bpp == 15) ? 2 : (svga->bpp / 8));
svga->ma_latch = (dev->vbe_regs[VBE_DISPI_INDEX_Y_OFFSET] * svga->rowoffset) +
(dev->vbe_regs[VBE_DISPI_INDEX_X_OFFSET] * ((svga->bpp == 15) ? 2 : (svga->bpp / 8)));
}
if (svga->ma_latch != dev->ma_latch_old) {
if (svga->bpp == 4) {
svga->maback = (svga->maback - (dev->ma_latch_old << 2)) +
(svga->ma_latch << 2);
} else {
svga->maback = (svga->maback - (dev->ma_latch_old)) +
(svga->ma_latch);
dev->ma_latch_old = svga->ma_latch;
}
(dev->vbe_regs[VBE_DISPI_INDEX_X_OFFSET] * ((svga->bpp == 15) ? 2 : (svga->bpp / 8)));
svga->fullchange = 3;
}
if (svga->bpp == 4)
@@ -482,18 +475,10 @@ bochs_vbe_outw(const uint16_t addr, const uint16_t val, void *priv)
} else {
svga->rowoffset = dev->vbe_regs[VBE_DISPI_INDEX_VIRT_WIDTH] * ((svga->bpp == 15) ? 2 : (svga->bpp / 8));
svga->ma_latch = (dev->vbe_regs[VBE_DISPI_INDEX_Y_OFFSET] * svga->rowoffset) +
(dev->vbe_regs[VBE_DISPI_INDEX_X_OFFSET] * ((svga->bpp == 15) ? 2 : (svga->bpp / 8)));
}
if (svga->ma_latch != dev->ma_latch_old) {
if (svga->bpp == 4) {
svga->maback = (svga->maback - (dev->ma_latch_old << 2)) +
(svga->ma_latch << 2);
} else {
svga->maback = (svga->maback - (dev->ma_latch_old)) +
(svga->ma_latch);
dev->ma_latch_old = svga->ma_latch;
}
(dev->vbe_regs[VBE_DISPI_INDEX_X_OFFSET] * ((svga->bpp == 15) ? 2 : (svga->bpp / 8)));
}
svga->fullchange = 3;
}
else
svga_recalctimings(&dev->svga);