From: Toni Wilen <twilen@winuae.net>
Date: Thu, 4 Dec 2025 15:56:19 +0000 (+0200)
Subject: Check for svpos or shpos == 0.
X-Git-Tag: 6020~35
X-Git-Url: https://git.unchartedbackwaters.co.uk/w/?a=commitdiff_plain;h=4d41e29dfbf28fb643df71f5ec3afc4372f9650e;p=francis%2Fwinuae.git

Check for svpos or shpos == 0.
---

diff --git a/custom.cpp b/custom.cpp
index ac776ebc..ffac056a 100644
--- a/custom.cpp
+++ b/custom.cpp
@@ -1383,7 +1383,10 @@ void compute_vsynctime(void)
 		vsynctimebase = (frame_time_t)(syncbase / fake_vblank_hz);
 	}
 	vsynctimebase_orig = vsynctimebase;
-	cputimebase = syncbase / ((uae_u32)(svpos * shpos));
+	cputimebase = 0;
+	if (svpos > 0 && shpos > 0) {
+		cputimebase = syncbase / ((uae_u32)(svpos * shpos));
+	}
 	if (cputimebase == 0) {
 		cputimebase = 1;
 	}