From c33e31157c4bfec02e8d0cabb78e3619fb1e581c Mon Sep 17 00:00:00 2001
From: Ralf Jung <post@ralfj.de>
Date: Fri, 21 Feb 2014 13:02:57 +0100
Subject: [PATCH] test for invalid FBConfigs; explicitly request an FBConfig
 suited for a WINDOW

---
 glxbackend.cpp | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/glxbackend.cpp b/glxbackend.cpp
index d636f67..a5c9e0c 100644
--- a/glxbackend.cpp
+++ b/glxbackend.cpp
@@ -32,6 +32,7 @@
 static int configAttribs[] =                                             
 {
 	GLX_RENDER_TYPE, GLX_RGBA_BIT,
+	GLX_DRAWABLE_TYPE, GLX_WINDOW_BIT,
 	GLX_DOUBLEBUFFER, True,
 	GLX_RED_SIZE, 4,
 	GLX_GREEN_SIZE, 4,
@@ -77,6 +78,9 @@ VisualID GLXBackend::initialize(Display *display)
 	}
 	// return visual ID
 	XVisualInfo *vi = glXGetVisualFromFBConfig(display, config);
+	if (vi== NULL) {
+		die("The GLXFBConfig I got is invalid\n");
+	}
 	VisualID visualid = vi->visualid;
 	XFree(vi);
 	return visualid;
-- 
2.30.2