From c21a8573b40109a92b364fb1f18339e27d8d3aa0 Mon Sep 17 00:00:00 2001
From: Camilla Berglund <elmindreda@elmindreda.org>
Date: Tue, 7 Apr 2015 02:34:08 +0200
Subject: [PATCH] Replaced comment with assertion.

---
 src/wgl_context.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/src/wgl_context.c b/src/wgl_context.c
index ac41082e..dbae2bd4 100644
--- a/src/wgl_context.c
+++ b/src/wgl_context.c
@@ -122,12 +122,13 @@ static void initWGLExtensions(_GLFWwindow* window)
 }
 
 // Returns the specified attribute of the specified pixel format
-// NOTE: Do not call this unless we have found WGL_ARB_pixel_format
 //
 static int getPixelFormatAttrib(_GLFWwindow* window, int pixelFormat, int attrib)
 {
     int value = 0;
 
+    assert(window->wgl.ARB_pixel_format);
+
     if (!window->wgl.GetPixelFormatAttribivARB(window->wgl.dc,
                                                pixelFormat,
                                                0, 1, &attrib, &value))