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Implement the Super MegaZeux text mode.

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This commit is contained in:
OBattler
2025-09-08 22:27:39 +02:00
parent 204afb5f33
commit 84d96271de
1 changed files with 56 additions and 14 deletions
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70
src/video/vid_svga_render.c
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@@ -243,6 +243,8 @@ svga_render_text_80(svga_t *svga)
p = &svga->monitor->target_buffer->line[svga->displine + svga->y_add][svga->x_add];
xinc = (svga->seqregs[1] & 1) ? 8 : 9;
uint32_t col = 0x00000000;
for (int x = 0; x < (svga->hdisp + svga->scrollcache); x += xinc) {
if (!svga->force_old_addr)
addr = svga->remap_func(svga, svga->memaddr) & svga->vram_display_mask;
@@ -263,30 +265,70 @@ svga_render_text_80(svga_t *svga)
charaddr = svga->charseta + (chr * 128);
if (drawcursor) {
bg = svga->pallook[svga->egapal[attr & 15] & svga->dac_mask];
fg = svga->pallook[svga->egapal[attr >> 4] & svga->dac_mask];
bg = attr & 15;
fg = attr >> 4;
} else {
fg = svga->pallook[svga->egapal[attr & 15] & svga->dac_mask];
bg = svga->pallook[svga->egapal[attr >> 4] & svga->dac_mask];
fg = attr & 15;
bg = attr >> 4;
if (attr & 0x80 && svga->attrregs[0x10] & 8) {
bg = svga->pallook[svga->egapal[(attr >> 4) & 7] & svga->dac_mask];
bg = (attr >> 4) & 7;
if (svga->blink & 16)
fg = bg;
}
}
dat = svga->vram[charaddr + (svga->scanline << 2)];
if (svga->seqregs[1] & 1) {
for (xx = 0; xx < 8; xx++)
p[xx] = (dat & (0x80 >> xx)) ? fg : bg;
if (svga->attrregs[0x10] & 0x40) {
pclog("256-color text mode\n");
if (svga->seqregs[1] & 1) {
for (xx = 0; xx < 8; xx++) {
uint32_t col16 = (dat & (0x80 >> xx)) ? fg : bg;
if ((x + xx - svga->scrollcache) & 1) {
col |= col16;
if ((x + xx - 1) >= 0)
p[xx - 1] = svga->pallook[col & svga->dac_mask];
if ((x + xx) >= 0)
p[xx] = svga->pallook[col & svga->dac_mask];
} else
col = col16 << 4;
}
} else {
for (xx = 0; xx < 9; xx++) {
uint32_t col16;
if (xx < 8)
col16 = (dat & (0x80 >> xx)) ? fg : bg;
else if ((chr & ~0x1F) != 0xC0 || !(svga->attrregs[0x10] & 4))
col16 = bg;
else
col16 = (dat & 1) ? fg : bg;
if ((x + xx - svga->scrollcache) & 1) {
col |= col16;
if ((x + xx - 1) >= 0)
p[xx - 1] = svga->pallook[col & svga->dac_mask];
if ((x + xx) >= 0)
p[xx] = svga->pallook[col & svga->dac_mask];
} else
col = col16 << 4;
}
}
} else {
for (xx = 0; xx < 8; xx++)
p[xx] = (dat & (0x80 >> xx)) ? fg : bg;
if ((chr & ~0x1F) != 0xC0 || !(svga->attrregs[0x10] & 4))
p[8] = bg;
else
p[8] = (dat & 1) ? fg : bg;
fg = svga->pallook[svga->egapal[fg] & svga->dac_mask];
bg = svga->pallook[svga->egapal[bg] & svga->dac_mask];
if (svga->seqregs[1] & 1) {
for (xx = 0; xx < 8; xx++)
p[xx] = (dat & (0x80 >> xx)) ? fg : bg;
} else {
for (xx = 0; xx < 8; xx++)
p[xx] = (dat & (0x80 >> xx)) ? fg : bg;
if ((chr & ~0x1F) != 0xC0 || !(svga->attrregs[0x10] & 4))
p[8] = bg;
else
p[8] = (dat & 1) ? fg : bg;
}
}
svga->memaddr += 4;
p += xinc;
}