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Separate baseline calibration trigger from display offset updates, clamp crtc[7] position to valid range and use calibrated baseline_vsyncpos for vsync comparison to avoid display issues when overscan in enabled

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pixel-jupiter
2025-09-30 12:57:10 +03:00
parent aa7cb72c93
commit 3e7b3d32e8
1 changed files with 8 additions and 9 deletions
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17
src/video/vid_tandy.c
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@@ -191,11 +191,6 @@ vid_update_display_offset(t1kvid_t *vid, uint8_t reg)
int hsync_scale = (vid->mode & 1) ? 8 : 16;
int vsync_scale = vid->crtc[9] + 1;
if (reg == 1 || reg == 6) {
baseline_calib_start(vid);
return;
}
if (!vid->baseline_ready) {
vid->hsync_offset = 0;
vid->vsync_offset = 0;
@@ -206,6 +201,10 @@ vid_update_display_offset(t1kvid_t *vid, uint8_t reg)
vid->hsync_offset = ((int)vid->baseline_hsyncpos - (int)vid->crtc[2]) * hsync_scale;
break;
case 7:
if (vid->crtc[7] < vid->crtc[6])
vid->crtc[7] = vid->crtc[6];
else if (vid->crtc[7] > vid->crtc[4])
vid->crtc[7] = vid->crtc[4];
vid->vsync_offset = ((int)vid->baseline_vsyncpos - (int)vid->crtc[7]) * vsync_scale;
break;
}
@@ -238,10 +237,10 @@ tandy_vid_out(uint16_t addr, uint8_t val, void *priv)
vid->fullchange = changeframecount;
recalc_timings(dev);
}
if ((vid->crtcreg >= 0x01 && vid->crtcreg <= 0x02) ||
(vid->crtcreg >= 0x06 && vid->crtcreg <= 0x07)) {
if (vid->crtcreg == 0x01 || vid->crtcreg == 0x06)
baseline_calib_start(vid);
if (vid->crtcreg == 0x02 || vid->crtcreg == 0x07)
vid_update_display_offset(vid, vid->crtcreg);
}
}
break;
@@ -771,7 +770,7 @@ vid_poll(void *priv)
else
vid->cursoron = vid->blink & 16;
}
if (vid->vc == vid->crtc[7]) {
if (vid->vc == vid->baseline_vsyncpos) {
vid->dispon = 0;
vid->displine = 0;
vid->vsynctime = 16;