From c4e8f959d4d0dfccaa5ae8c905f5c428ed38b177 Mon Sep 17 00:00:00 2001
From: FunkyFr3sh <cc.red.alert.1@googlemail.com>
Date: Fri, 16 Sep 2022 12:33:08 +0200
Subject: [PATCH] flip file mapping

---
 src/ddsurface.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/src/ddsurface.c b/src/ddsurface.c
index be89140..55f0ebd 100644
--- a/src/ddsurface.c
+++ b/src/ddsurface.c
@@ -542,10 +542,12 @@ HRESULT dds_Flip(IDirectDrawSurfaceImpl* This, IDirectDrawSurfaceImpl* lpDDSurfa
         void* buf = InterlockedExchangePointer(&This->surface, backbuffer->surface);
         HBITMAP bitmap = (HBITMAP)InterlockedExchangePointer(&This->bitmap, backbuffer->bitmap);
         HDC dc = (HDC)InterlockedExchangePointer(&This->hdc, backbuffer->hdc);
+        HANDLE map = (HANDLE)InterlockedExchangePointer(&This->surface_mapping, backbuffer->surface_mapping);
 
         InterlockedExchangePointer(&backbuffer->surface, buf);
         InterlockedExchangePointer(&backbuffer->bitmap, bitmap);
         InterlockedExchangePointer(&backbuffer->hdc, dc);
+        InterlockedExchangePointer(&backbuffer->surface_mapping, map);
 
         if (g_ddraw->flipclear)
         {