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vid_ega: Implement graphics blinking required for 640x350 mono graphics modes

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This commit is contained in:
Ben Russell
2023-03-23 20:07:50 +13:00
parent 935d49da6c
commit 9e758ca0b0
1 changed files with 6 additions and 2 deletions
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8
src/video/vid_ega_render.c
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@@ -187,8 +187,11 @@ ega_render_graphics(ega_t *ega)
const bool doublewidth = ((ega->seqregs[1] & 8) != 0);
const bool cga2bpp = ((ega->gdcreg[5] & 0x20) != 0);
const bool attrblink = ((ega->attrregs[0x10] & 8) != 0);
const bool blinked = ega->blink & 0x10;
const bool crtcreset = ((ega->crtc[0x17] & 0x80) == 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];
const int dwshift = doublewidth ? 1 : 0;
const int dotwidth = 1 << dwshift;
@@ -231,8 +234,9 @@ ega_render_graphics(ega_t *ega)
const int inshift = 6 - i;
uint8_t dat = (edatlookup[(edat[0] >> inshift) & 3][(edat[1] >> inshift) & 3] )
| (edatlookup[(edat[2] >> inshift) & 3][(edat[3] >> inshift) & 3] << 2);
uint32_t p0 = ega->pallook[ega->egapal[(dat >> 4) & ega->plane_mask]];
uint32_t p1 = ega->pallook[ega->egapal[(dat ) & ega->plane_mask]];
// FIXME: Confirm blink behaviour is actually XOR on real hardware
uint32_t p0 = ega->pallook[ega->egapal[((dat >> 4) & ega->plane_mask) ^ blinkmask]];
uint32_t p1 = ega->pallook[ega->egapal[((dat ) & ega->plane_mask) ^ blinkmask]];
for (int subx = 0; subx < dotwidth; subx++)
p[outoffs + subx] = p0;
for (int subx = 0; subx < dotwidth; subx++)