Recognise some #define enums, improve pfn type gen, update SDL, more fixes

Author: Perksey

.silktouch/0afb5dc84012c2fa.stout

@@ -0,0 +1,35 @@
+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MIT license.
+// Ported from SDL.h and corresponding dependencies of SDL3.
+// Original source is Copyright (C) 1997-2024 Sam Lantinga. Licensed under the zlib license.
+using System;
+using System.Runtime.CompilerServices;
+using System.Runtime.InteropServices;
+
+namespace Silk.NET.SDL;
+
+public readonly unsafe partial struct DisplayModeDataHandle
+{
+    public readonly void* Handle;
+
+    public bool Equals(DisplayModeDataHandle other) => Handle == other.Handle;
+
+    public override bool Equals(object? obj) => obj is DisplayModeDataHandle other && Equals(other);
+
+    public override int GetHashCode() => HashCode.Combine((nuint)Handle);
+
+    public static bool operator ==(DisplayModeDataHandle left, DisplayModeDataHandle right) =>
+        left.Equals(right);
+
+    public static bool operator !=(DisplayModeDataHandle left, DisplayModeDataHandle right) =>
+        !left.Equals(right);
+
+    public bool Equals(NullPtr _) => Handle is null;
+
+    public static bool operator ==(DisplayModeDataHandle left, NullPtr right) => left.Equals(right);
+
+    public static bool operator !=(DisplayModeDataHandle left, NullPtr right) =>
+        !left.Equals(right);
+
+    public static implicit operator DisplayModeDataHandle(NullPtr _) => default;
+}

.silktouch/c8c046b328b09d23.stout

@@ -0,0 +1,34 @@
+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MIT license.
+// Ported from SDL.h and corresponding dependencies of SDL3.
+// Original source is Copyright (C) 1997-2024 Sam Lantinga. Licensed under the zlib license.
+using System;
+using System.Runtime.CompilerServices;
+using System.Runtime.InteropServices;
+
+namespace Silk.NET.SDL;
+
+public readonly unsafe partial struct GLContextStateHandle
+{
+    public readonly void* Handle;
+
+    public bool Equals(GLContextStateHandle other) => Handle == other.Handle;
+
+    public override bool Equals(object? obj) => obj is GLContextStateHandle other && Equals(other);
+
+    public override int GetHashCode() => HashCode.Combine((nuint)Handle);
+
+    public static bool operator ==(GLContextStateHandle left, GLContextStateHandle right) =>
+        left.Equals(right);
+
+    public static bool operator !=(GLContextStateHandle left, GLContextStateHandle right) =>
+        !left.Equals(right);
+
+    public bool Equals(NullPtr _) => Handle is null;
+
+    public static bool operator ==(GLContextStateHandle left, NullPtr right) => left.Equals(right);
+
+    public static bool operator !=(GLContextStateHandle left, NullPtr right) => !left.Equals(right);
+
+    public static implicit operator GLContextStateHandle(NullPtr _) => default;
+}

.silktouch/f634eee0bf239a81.stout

@@ -0,0 +1,34 @@
+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MIT license.
+// Ported from SDL.h and corresponding dependencies of SDL3.
+// Original source is Copyright (C) 1997-2024 Sam Lantinga. Licensed under the zlib license.
+using System;
+using System.Runtime.CompilerServices;
+using System.Runtime.InteropServices;
+
+namespace Silk.NET.SDL;
+
+public readonly unsafe partial struct SharedObjectHandle
+{
+    public readonly void* Handle;
+
+    public bool Equals(SharedObjectHandle other) => Handle == other.Handle;
+
+    public override bool Equals(object? obj) => obj is SharedObjectHandle other && Equals(other);
+
+    public override int GetHashCode() => HashCode.Combine((nuint)Handle);
+
+    public static bool operator ==(SharedObjectHandle left, SharedObjectHandle right) =>
+        left.Equals(right);
+
+    public static bool operator !=(SharedObjectHandle left, SharedObjectHandle right) =>
+        !left.Equals(right);
+
+    public bool Equals(NullPtr _) => Handle is null;
+
+    public static bool operator ==(SharedObjectHandle left, NullPtr right) => left.Equals(right);
+
+    public static bool operator !=(SharedObjectHandle left, NullPtr right) => !left.Equals(right);
+
+    public static implicit operator SharedObjectHandle(NullPtr _) => default;
+}

eng/submodules/sdl

@@ -8,8 +8,9 @@
 namespace Silk.NET.SDL;
 
 [NativeTypeName("unsigned int")]
-public enum GLcontextReleaseFlag : uint
+public enum AppResult : uint
 {
-    None = 0x0000,
-    Flush = 0x0001,
+    Continue,
+    Success,
+    Failure,
 }