From 9c7e5201db186816141e0a60f6c5c5aec5d630e5 Mon Sep 17 00:00:00 2001
From: "Stefanos A." <stapostol@gmail.com>
Date: Wed, 27 Nov 2013 19:36:42 +0100
Subject: [PATCH] Fixed entry point validity check

---
 Source/OpenTK/Platform/Windows/WinGLContext.cs | 10 ++++------
 1 file changed, 4 insertions(+), 6 deletions(-)

diff --git a/Source/OpenTK/Platform/Windows/WinGLContext.cs b/Source/OpenTK/Platform/Windows/WinGLContext.cs
index 73b0eca3..860f4cad 100644
--- a/Source/OpenTK/Platform/Windows/WinGLContext.cs
+++ b/Source/OpenTK/Platform/Windows/WinGLContext.cs
@@ -348,12 +348,10 @@ namespace OpenTK.Platform.Windows
 
         static bool IsValid(IntPtr address)
         {
-            unsafe
-            {
-                // See https://www.opengl.org/wiki/Load_OpenGL_Functions
-                void* a = address.ToPointer();
-                return a < (void*)-1 || a > (void*)3;
-            }
+            // See https://www.opengl.org/wiki/Load_OpenGL_Functions
+            long a = address.ToInt64();
+            bool is_valid = (a < -1 )|| (a > 3);
+            return is_valid;
         }
 
         #endregion