From f0cdc21deaaa51d815d141791f171b256f778036 Mon Sep 17 00:00:00 2001
From: "Kai A. Hiller" <V02460@gmail.com>
Date: Thu, 26 Mar 2020 11:17:27 +0100
Subject: [PATCH] Fix setting doublebuffering

---
 basegraph.cpp | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/basegraph.cpp b/basegraph.cpp
index 791279ff..89bd988f 100644
--- a/basegraph.cpp
+++ b/basegraph.cpp
@@ -1057,7 +1057,8 @@ EX void setvideomode() {
   
 #if CAP_GL
   if(vid.usingGL) {
-    flags = SDL_OPENGL | SDL_HWSURFACE | SDL_GL_DOUBLEBUFFER;
+    flags = SDL_OPENGL | SDL_HWSURFACE;
+    SDL_GL_SetAttribute(SDL_GL_DOUBLEBUFFER, 1);
     SDL_GL_SetAttribute(SDL_GL_STENCIL_SIZE, 1);
     if(vsync_off) disable_vsync();
     if(vid.antialias & AA_MULTI) {