From 55c8a53b09a8e049b62249f2ff13aa7fb42934b3 Mon Sep 17 00:00:00 2001
From: "Adam D. Ruppe" <destructionator@gmail.com>
Date: Mon, 1 Feb 2016 13:53:48 -0500
Subject: [PATCH] make the openGL stuff do nothing if null

---
 simpledisplay.d | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/simpledisplay.d b/simpledisplay.d
index 87c1b11..a3fa9a3 100644
--- a/simpledisplay.d
+++ b/simpledisplay.d
@@ -936,11 +936,12 @@ class SimpleWindow : CapableOfHandlingNativeEvent {
 		void redrawOpenGlSceneNow() {
 		  version(X11) if (!this._visible) return; // no need to do this if window is invisible
 			if (this._closed) return; // window may be closed, but timer is still firing; avoid GLXBadDrawable error
+			if(redrawOpenGlScene is null)
+				return;
 
 			this.setAsCurrentOpenGlContext();
 
-			if(redrawOpenGlScene !is null)
-				redrawOpenGlScene();
+			redrawOpenGlScene();
 
 			this.swapOpenGlBuffers();
 			// at least nvidia proprietary crap segfaults on exit if you won't do this and will call glTexSubImage2D() too fast; no, `glFlush()` won't work.