From 70407fe357632124cb8fb94a8710431816e530ee Mon Sep 17 00:00:00 2001
From: Alug <alufoliehorst@gmail.com>
Date: Mon, 20 Oct 2025 16:03:52 +0200
Subject: [PATCH] R_FlushQuad: also check "source" for alignment

---
 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 1382c3ec1..bc88ccca4 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 -- make sure our dest ptr AND viewwidth are a multiple of 8!
-		if (((uintptr_t)dest & 7) == 0 && (stride & 7) == 0)
+		// 8 byte aligned copy -- make sure our dest ptr, source ptr AND stride are a multiple of 8!
+		if ((((uintptr_t)dest | (uintptr_t)source | stride) & 7) == 0)
 		{
 			const INT64 *source64 = reinterpret_cast<const INT64 *>(source);
 			INT64 *dest64 = reinterpret_cast<INT64 *>(dest);