Add some missing macros

SDL3-CS.Tests/TestInterface.cs

@@ -0,0 +1,44 @@
+// Copyright (c) ppy Pty Ltd <contact@ppy.sh>. Licensed under the MIT Licence.
+// See the LICENCE file in the repository root for full licence text.
+
+using NUnit.Framework;
+
+namespace SDL.Tests
+{
+    [TestFixture]
+    public class TestInterface
+    {
+        [Test]
+        public unsafe void TestIOInterface()
+        {
+            SDL_IOStreamInterface iface;
+
+            SDL3.SDL_INIT_INTERFACE(out iface);
+
+            Assert.That(iface.version, Is.EqualTo(sizeof(SDL_IOStreamInterface)));
+            Assert.That(iface.size == null);
+            Assert.That(iface.seek == null);
+            Assert.That(iface.read == null);
+            Assert.That(iface.write == null);
+            Assert.That(iface.flush == null);
+            Assert.That(iface.close == null);
+        }
+
+        [Test]
+        public unsafe void TestIOInterfaceManual()
+        {
+            SDL_IOStreamInterface iface = new SDL_IOStreamInterface
+            {
+                version = (uint)sizeof(SDL_IOStreamInterface),
+            };
+
+            Assert.That(iface.version, Is.EqualTo(sizeof(SDL_IOStreamInterface)));
+            Assert.That(iface.size == null);
+            Assert.That(iface.seek == null);
+            Assert.That(iface.read == null);
+            Assert.That(iface.write == null);
+            Assert.That(iface.flush == null);
+            Assert.That(iface.close == null);
+        }
+    }
+}

SDL3-CS/SDL3/SDL_audio.cs

@@ -11,6 +11,10 @@ namespace SDL
 
     public static partial class SDL3
     {
+        [Macro]
+        public static SDL_AudioFormat SDL_DEFINE_AUDIO_FORMAT(UInt16 signed, UInt16 bigendian, UInt16 @float, UInt16 size) =>
+            (SDL_AudioFormat)(((UInt16)(signed) << 15) | ((UInt16)(bigendian) << 12) | ((UInt16)(@float) << 8) | ((size) & (UInt16)SDL_AUDIO_MASK_BITSIZE));
+
         [Constant]
         public static readonly SDL_AudioFormat SDL_AUDIO_S16 = BitConverter.IsLittleEndian ? SDL_AudioFormat.SDL_AUDIO_S16LE : SDL_AudioFormat.SDL_AUDIO_S16BE;
 

SDL3-CS/SDL3/SDL_stdinc.cs

@@ -46,6 +46,20 @@ namespace SDL
         [Macro]
         public static uint SDL_FOURCC(byte A, byte B, byte C, byte D) => (uint)((A << 0) | (B << 8) | (C << 16) | (D << 24));
 
+        [Macro]
+        public static unsafe void SDL_INIT_INTERFACE(out SDL_IOStreamInterface iface)
+        {
+            iface = default;
+            iface.version = (uint)sizeof(SDL_IOStreamInterface);
+        }
+
+        [Macro]
+        public static unsafe void SDL_INIT_INTERFACE(out SDL_StorageInterface iface)
+        {
+            iface = default;
+            iface.version = (uint)sizeof(SDL_StorageInterface);
+        }
+
         public static unsafe void SDL_free(void* mem) => SDL_free((IntPtr)mem);
     }
 }