OpenAL MCFormats extension (#1618)

* start of openal ext_mcformats support

* OpenAL EXT_MCFORMATS support

* Improve docs

src/OpenAL/Extensions/Silk.NET.OpenAL.Extensions.EXT/Enums/MCBufferFormat.cs

@@ -0,0 +1,77 @@
+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MIT license.
+
+namespace Silk.NET.OpenAL.Extensions.EXT.Enums
+{
+    /// <summary>
+    /// Defines valid format specifiers for sound samples. This covers the additions from the OpenAL multi-channel buffers
+    /// extension.
+    /// </summary>
+    public enum MCBufferFormat
+    {
+        /// <summary>
+        /// 4 channels, unsigned 8-bit
+        /// </summary>
+        Quad8 = 0x1204,
+        /// <summary>
+        /// 4 channels, signed 16-bit
+        /// </summary>
+        Quad16 = 0x1205,
+        /// <summary>
+        /// 4 channels, 32-bit float
+        /// </summary>
+        Quad32 = 0x1206,
+
+        /// <summary>
+        /// 2 channels, unsigned 8-bit
+        /// </summary>
+        Rear8 = 0x1207,
+        /// <summary>
+        /// 2 channels, signed 16-bit
+        /// </summary>
+        Rear16 = 0x1208,
+        /// <summary>
+        /// 2 channels, 32-bit float
+        /// </summary>
+        Rear32 = 0x1209,
+
+        /// <summary>
+        /// 5.1 (6 channels), unsigned 8-bit
+        /// </summary>
+        S51Chn8 = 0x120A,
+        /// <summary>
+        /// 5.1 (6 channels), signed 16-bit
+        /// </summary>
+        S51Chn16 = 0x120B,
+        /// <summary>
+        /// 5.1 (6 channels), 32-bit float
+        /// </summary>
+        S51Chn32 = 0x120C,
+
+        /// <summary>
+        /// 6.1 (7 channels), unsigned 8-bit
+        /// </summary>
+        S61Chn8 = 0x120D,
+        /// <summary>
+        /// 6.1 (7 channels), signed 16-bit
+        /// </summary>
+        S61Chn16 = 0x120E,
+        /// <summary>
+        /// 6.1 (7 channels), 32-bit float
+        /// </summary>
+        S61Chn32 = 0x120F,
+
+        /// <summary>
+        /// 7.1 (8 channels), unsigned 8-bit
+        /// </summary>
+        S71Chn8 = 0x1210,
+        /// <summary>
+        /// 7.1 (8 channels), signed 16-bit
+        /// </summary>
+        S71Chn16 = 0x1211,
+        /// <summary>
+        /// 7.1 (8 channels), 32-bit float
+        /// </summary>
+        S71Chn32 = 0x1212
+    }
+}

src/OpenAL/Extensions/Silk.NET.OpenAL.Extensions.EXT/MCFormats.cs

@@ -0,0 +1,26 @@
+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MIT license.
+
+using Silk.NET.Core.Attributes;
+using Silk.NET.Core.Contexts;
+using Silk.NET.Core.Native;
+using Silk.NET.OpenAL.Extensions.EXT.Enums;
+
+namespace Silk.NET.OpenAL.Extensions.EXT
+{
+
+    /// <summary>
+    /// Exposes the OpenAL multi-channel buffers extension.
+    /// </summary>
+    [Extension("AL_EXT_MCFORMATS")]
+    [NativeApi(Prefix = "al")]
+    public partial class MCFormats : FormatExtensionBase<MCBufferFormat>
+    {
+        /// <inheritdoc cref="ExtensionBase" />
+        public MCFormats(INativeContext ctx)
+            : base(ctx)
+        {
+        }
+    }
+
+}