From 3ad600f4dcf0ee7c689387e3bce7bbd9a70d9c97 Mon Sep 17 00:00:00 2001
From: Dylan Perks <dylanperks23@gmail.com>
Date: Mon, 9 Oct 2023 21:23:05 -0500
Subject: [PATCH] Add a hack for #1691

---
 src/OpenAL/Silk.NET.OpenAL/AL/AL.cs | 21 ++++++++++++++++++++-
 1 file changed, 20 insertions(+), 1 deletion(-)

diff --git a/src/OpenAL/Silk.NET.OpenAL/AL/AL.cs b/src/OpenAL/Silk.NET.OpenAL/AL/AL.cs
index a50ad58a95..2f9049d8ea 100644
--- a/src/OpenAL/Silk.NET.OpenAL/AL/AL.cs
+++ b/src/OpenAL/Silk.NET.OpenAL/AL/AL.cs
@@ -26,7 +26,26 @@ public AL(INativeContext ctx)
         }
 
         /// <inheritdoc />
-        public override partial bool IsExtensionPresent(string name);
+        public override unsafe bool IsExtensionPresent(string name)
+        {
+            if (name.StartsWith("ALC_"))
+            {
+                // extreme hack for ALC_EXT_EFX which does not have a standard AL variant
+                var maxName = SilkMarshal.GetMaxSizeOf(name, NativeStringEncoding.UTF8);
+                var nameNative = name.Length > 256 ? new byte[maxName] : stackalloc byte[maxName];
+                SilkMarshal.StringIntoSpan(name, nameNative, NativeStringEncoding.UTF8);
+                fixed (byte* namePtr = nameNative)
+                {
+                    return ((delegate* unmanaged[Cdecl]<byte*, char>) Context.GetProcAddress("alcIsExtensionPresent"))
+                        (namePtr) == 1;
+                }
+            }
+
+            return CoreIsExtensionPresent(name);
+        }
+
+        [NativeApi(EntryPoint = nameof(IsExtensionPresent))]
+        private partial bool CoreIsExtensionPresent(string name);
 
         /// <inheritdoc />
         public SearchPathContainer SearchPaths => _searchPaths ??= new OpenALLibraryNameContainer(_soft);