[PATCH 1/1] win32u: Also flush the GL drawable if the client surface is offscreen.

[Rémi Bernon]

From: Rémi Bernon

Making sure the driver will present the surface for games drawing to the
front buffer.

Wine-Bug: https://bugs.winehq.org/show_bug.cgi?id=58515
Wine-Bug: https://bugs.winehq.org/show_bug.cgi?id=58534
---
 dlls/win32u/opengl.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/dlls/win32u/opengl.c b/dlls/win32u/opengl.c
index f27143f3357..2b7fbd8dac6 100644
--- a/dlls/win32u/opengl.c
+++ b/dlls/win32u/opengl.c
@@ -213,7 +213,8 @@ static void opengl_drawable_flush( struct opengl_drawable *drawable, int interva
         flags = GL_FLUSH_INTERVAL;
     }

-    if (flags) drawable->funcs->flush( drawable, flags );
+    if (flags || InterlockedCompareExchange( &drawable->client->offscreen, 0, 0 ))
+        drawable->funcs->flush( drawable, flags );
 }

#ifdef SONAME_LIBEGL