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SuperEGA: Implement row and vertical divide modes.

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This commit is contained in:
OBattler
2025-03-22 23:57:05 +01:00
parent fb0704de99
commit 2151a6064f
2 changed files with 17 additions and 5 deletions
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1
src/include/86box/vid_ega.h
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@@ -73,6 +73,7 @@ typedef struct ega_t {
int oddeven_page;
int oddeven_chain;
int vc;
int real_vc;
int sc;
int dispon;
int hdisp_on;

21
src/video/vid_ega.c
View File

@@ -620,11 +620,15 @@ ega_recalctimings(ega_t *ega)
ega->y_add >>= 1;
if (ega->seqregs[1] & 8) {
disptime = (double) ((ega->crtc[0] + 2) << 1);
_dispontime = (double) ((ega->crtc[1] + 1) << 1);
disptime = (double) ((ega->crtc[0] + 2) << 1);
_dispontime = (double) ((ega->crtc[1] + 1) << 1);
} else {
disptime = (double) (ega->crtc[0] + 2);
_dispontime = (double) (ega->crtc[1] + 1);
disptime = (double) (ega->crtc[0] + 2);
_dispontime = (double) (ega->crtc[1] + 1);
}
if ((ega->actual_type == EGA_SUPEREGA) && (ega->crtc[0xf9] & 0x01)) {
disptime *= 2.0;
_dispontime *= 2.0;
}
_dispofftime = disptime - _dispontime;
_dispontime *= crtcconst;
@@ -852,7 +856,10 @@ ega_poll(void *priv)
ega->cca = ega->maback;
}
}
ega->vc++;
ega->real_vc++;
if ((ega->actual_type != EGA_SUPEREGA) || !(ega->crtc[0xf9] & 0x02) ||
!(ega->real_vc & 1))
ega->vc++;
if (ega->chipset) {
if (ega->hdisp > 640)
ega->vc &= 1023;
@@ -905,9 +912,13 @@ ega_poll(void *priv)
if (ega->vres) {
wy = (ega->lastline - ega->firstline) << 1;
if ((ega->actual_type == EGA_SUPEREGA) && (ega->crtc[0xf9] & 0x02))
wy >>= 1;
ega_doblit(wx, wy, ega);
} else {
wy = ega->lastline - ega->firstline;
if ((ega->actual_type == EGA_SUPEREGA) && (ega->crtc[0xf9] & 0x02))
wy >>= 1;
ega_doblit(wx, wy, ega);
}