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Add 8-dot hscroll compensation to EGA graphics modes

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This is in lieu of whatever the correct emulation would be (as per the text modes).
Somehow I forgot to add this when reworking the fine scroll implementations.
This commit is contained in:
GreaseMonkey
2024-01-23 16:02:32 +13:00
parent b607d191f4
commit 9844cbc245
1 changed files with 10 additions and 0 deletions
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10
src/video/vid_ega_render.c
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@@ -199,6 +199,7 @@ ega_render_graphics(ega_t *ega)
const bool attrblink = ((ega->attrregs[0x10] & 8) != 0);
const bool blinked = ega->blink & 0x10;
const bool crtcreset = ((ega->crtc[0x17] & 0x80) == 0);
const bool seq9dot = ((ega->seqregs[1] & 1) == 0);
const bool seqoddeven = ((ega->seqregs[1] & 4) != 0);
const uint8_t blinkmask = (attrblink && blinked ? 0x8 : 0x0);
uint32_t *p = &buffer32->line[ega->displine + ega->y_add][ega->x_add];
@@ -206,6 +207,15 @@ ega_render_graphics(ega_t *ega)
const int dotwidth = 1 << dwshift;
const int charwidth = dotwidth * 8;
int secondcclk = 0;
/* Compensate for 8dot scroll */
if (!seq9dot) {
for (int x = 0; x < dotwidth; x++) {
p[x] = ega->overscan_color;
}
p += dotwidth;
}
for (int x = 0; x <= (ega->hdisp + ega->scrollcache); x += charwidth) {
uint32_t addr = ega->remap_func(ega, ega->ma) & ega->vrammask;