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ATi Mach64: Override (S)VGA horizontal blanking calculation in accelerator CRTC mode.

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This commit is contained in:
OBattler
2024-01-10 22:41:13 +01:00
parent e33be47e53
commit 03a1f783f2
2 changed files with 13 additions and 9 deletions
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2
src/video/vid_ati_mach64.c
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@@ -510,6 +510,7 @@ mach64_recalctimings(svga_t *svga)
const mach64_t *mach64 = (mach64_t *) svga->priv;
if (((mach64->crtc_gen_cntl >> 24) & 3) == 3) {
svga->hoverride = 1;
svga->vtotal = (mach64->crtc_v_total_disp & 2047) + 1;
svga->dispend = ((mach64->crtc_v_total_disp >> 16) & 2047) + 1;
svga->htotal = (mach64->crtc_h_total_disp & 255) + 1;
@@ -566,6 +567,7 @@ mach64_recalctimings(svga_t *svga)
svga->vram_display_mask = mach64->vram_mask;
} else {
svga->hoverride = 0;
svga->vram_display_mask = (mach64->regs[0x36] & 0x01) ? mach64->vram_mask : 0x3ffff;
}
}

20
src/video/vid_svga.c
View File

@@ -766,17 +766,19 @@ svga_recalctimings(svga_t *svga)
if (xga_active && (svga->xga != NULL))
xga_recalctimings(svga);
svga->hblankend = (svga->hblankstart & ~(svga->hblank_end_len - 1)) | svga->hblank_end_val;
if (svga->hblankend <= svga->hblankstart)
svga->hblankend += svga->hblank_end_len;
svga->hblankend += svga->hblank_ext;
if (!svga->hoverride) {
svga->hblankend = (svga->hblankstart & ~(svga->hblank_end_len - 1)) | svga->hblank_end_val;
if (svga->hblankend <= svga->hblankstart)
svga->hblankend += svga->hblank_end_len;
svga->hblankend += svga->hblank_ext;
svga->hblank_sub = 0;
if (svga->hblankend > svga->htotal) {
svga->hblankend &= (svga->hblank_end_len - 1);
svga->hblank_sub = svga->hblankend + svga->hblank_overscan;
svga->hblank_sub = 0;
if (svga->hblankend > svga->htotal) {
svga->hblankend &= (svga->hblank_end_len - 1);
svga->hblank_sub = svga->hblankend + svga->hblank_overscan;
svga->hdisp -= (svga->hblank_sub * svga->dots_per_clock);
svga->hdisp -= (svga->hblank_sub * svga->dots_per_clock);
}
}
if (svga->hdisp >= 2048)