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EGA: Implement monochrome attributes for text mode.

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OBattler
2025-03-23 02:22:10 +01:00
parent 2151a6064f
commit 646e25f1bc
2 changed files with 30 additions and 2 deletions
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12
src/video/vid_ega_render.c
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@@ -118,6 +118,7 @@ ega_render_text(ega_t *ega)
const bool doublewidth = ((ega->seqregs[1] & 8) != 0);
const bool attrblink = ((ega->attrregs[0x10] & 8) != 0);
const bool attrlinechars = (ega->attrregs[0x10] & 4);
const bool monoattrs = (ega->attrregs[0x10] & 2);
const bool crtcreset = ((ega->crtc[0x17] & 0x80) == 0);
const bool seq9dot = ((ega->seqregs[1] & 1) == 0);
const int dwshift = doublewidth ? 1 : 0;
@@ -174,8 +175,15 @@ ega_render_text(ega_t *ega)
if ((chr & ~0x1F) == 0xC0 && attrlinechars)
dat |= (dat >> 1) & 1;
for (int xx = 0; xx < charwidth; xx++)
p[xx] = (dat & (0x100 >> (xx >> dwshift))) ? fg : bg;
for (int xx = 0; xx < charwidth; xx++) {
if (monoattrs) {
if ((ega->sc == (ega->crtc[0x14] + 1)) && ((attr & 7) == 1))
p[xx] = ega->mdacols[attr][attrblink][1];
else
p[xx] = ega->mdacols[attr][attrblink][dat & (0x100 >> (xx >> dwshift))];
} else
p[xx] = (dat & (0x100 >> (xx >> dwshift))) ? fg : bg;
}
ega->ma += 4;
p += charwidth;