From 97249c9b471b2060bc2b2af4964ee879a3551b4b Mon Sep 17 00:00:00 2001
From: narzoul <narzoul@users.noreply.github.com>
Date: Sun, 7 Jul 2024 14:03:28 +0200
Subject: [PATCH] Fixed occasional frame drops on NVIDIA GPUs

See issue #298.
---
 DDrawCompat/D3dDdi/KernelModeThunks.cpp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/DDrawCompat/D3dDdi/KernelModeThunks.cpp b/DDrawCompat/D3dDdi/KernelModeThunks.cpp
index 61b905c..d1073b5 100644
--- a/DDrawCompat/D3dDdi/KernelModeThunks.cpp
+++ b/DDrawCompat/D3dDdi/KernelModeThunks.cpp
@@ -161,7 +161,7 @@ namespace
 		{
 			return -1;
 		}
-		return data.ScanLine;
+		return data.InVerticalBlank ? 0 : data.ScanLine;
 	}
 
 	void getVidPnSource(D3DKMT_HANDLE& adapter, UINT& vidPnSourceId)