From 07d054f3ad22c07ba2fa98d7dc6f4018a5b53272 Mon Sep 17 00:00:00 2001
From: Alug <alufoliehorst@gmail.com>
Date: Mon, 20 Oct 2025 00:48:29 +0200
Subject: [PATCH] R_FlushQuad: fix column flush on odd width resolutions

lets hope this is the end of our software woes Zzz...
---
 src/r_draw_flush.cpp | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/src/r_draw_flush.cpp b/src/r_draw_flush.cpp
index e729243e9..1382c3ec1 100644
--- a/src/r_draw_flush.cpp
+++ b/src/r_draw_flush.cpp
@@ -156,8 +156,8 @@ static void R_FlushQuad(void)
 
 	if constexpr (Type & ColumnFlushType::FLUSH_OPAQUE)
 	{
-		// aligned copy
-		if (((uintptr_t)dest & 7) == 0)
+		// aligned copy -- make sure our dest ptr AND viewwidth are a multiple of 8!
+		if (((uintptr_t)dest & 7) == 0 && (stride & 7) == 0)
 		{
 			const INT64 *source64 = reinterpret_cast<const INT64 *>(source);
 			INT64 *dest64 = reinterpret_cast<INT64 *>(dest);