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Rework EGA overscan to be compatible with the unit tester

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By the way, text mode scrolling at least seems to be correct now
This commit is contained in:
GreaseMonkey
2024-01-09 17:31:19 +13:00
parent 22ead81b80
commit bad7c6490e
1 changed files with 10 additions and 3 deletions
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13
src/video/vid_ega.c
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@@ -552,12 +552,18 @@ ega_recalctimings(ega_t *ega)
overscan_x = (ega->seqregs[1] & 1) ? 16 : 18;
if (ega->vres)
overscan_y <<= 1;
if (ega->seqregs[1] & 8)
overscan_x <<= 1;
ega->y_add = (overscan_y >> 1);
ega->x_add = (overscan_x >> 1);
if (ega->vres)
ega->y_add >>= 1;
if (ega->seqregs[1] & 8) {
disptime = (double) ((ega->crtc[0] + 2) << 1);
_dispontime = (double) ((ega->crtc[1] + 1) << 1);
@@ -896,11 +902,12 @@ ega_poll(void *priv)
void
ega_doblit(int wx, int wy, ega_t *ega)
{
int y_add = enable_overscan ? overscan_y : 0;
int unscaled_overscan_y = ega->vres ? overscan_y >> 1 : overscan_y;
int y_add = enable_overscan ? unscaled_overscan_y : 0;
int x_add = enable_overscan ? overscan_x : 0;
int y_start = enable_overscan ? 0 : (overscan_y >> 1);
int y_start = enable_overscan ? 0 : (unscaled_overscan_y >> 1);
int x_start = enable_overscan ? 0 : (overscan_x >> 1);
int bottom = (overscan_y >> 1);
int bottom = (unscaled_overscan_y >> 1);
uint32_t *p;
int i;
int j;