From ea22820118d351db112a0b5b3aa39e6d9f00a6f4 Mon Sep 17 00:00:00 2001
From: the_fiddler <the_fiddler@ebc5dd9b-fb1d-0410-b6f8-d24c324e9604>
Date: Sun, 13 Apr 2008 15:50:22 +0000
Subject: [PATCH] Improved handling of missing openal32.dll. It used to throw a
 TypeInitializationException. It now throws a DllNotFoundException.

---
 Source/OpenTK/Audio/AudioContext.cs | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/Source/OpenTK/Audio/AudioContext.cs b/Source/OpenTK/Audio/AudioContext.cs
index b5a876ac..b666db73 100644
--- a/Source/OpenTK/Audio/AudioContext.cs
+++ b/Source/OpenTK/Audio/AudioContext.cs
@@ -29,6 +29,7 @@ namespace OpenTK.Audio
         static object audio_context_lock = new object();
         static List<string> available_devices = new List<string>();
         static Dictionary<ContextHandle, AudioContext> available_contexts = new Dictionary<ContextHandle, AudioContext>();
+        static bool openal_supported = true;
         bool context_exists;
 
         #endregion
@@ -55,6 +56,8 @@ namespace OpenTK.Audio
         /// <exception cref="NotSupportedException">Occurs when no audio devices are available.</exception>
         public AudioContext()// : this(available_devices.Count > 0 ? available_devices[0] : null, 0, 0, false, 0) { }
         {
+            if (!openal_supported)
+                throw new DllNotFoundException("openal32.dll");
             CreateContext(null, 0, 0, false, 0);
         }
 
@@ -186,6 +189,11 @@ namespace OpenTK.Audio
                         foreach (string s in available_devices)
                             Debug.WriteLine(s);
                     }
+                    catch (DllNotFoundException e)
+                    {
+                        Debug.WriteLine(e.ToString());
+                        openal_supported = false;
+                    }
                     finally
                     {
                         Debug.Unindent();