Start on a more clean sheet and conservative implementation

Silk.NET.sln

@@ -90,8 +90,6 @@ Project("{2150E333-8FDC-42A3-9474-1A3956D46DE8}") = "SilkTouch", "SilkTouch", "{
 EndProject
 Project("{2150E333-8FDC-42A3-9474-1A3956D46DE8}") = "Windowing", "Windowing", "{AE84F4C8-6102-4A72-86EF-0C9345AA27A9}"
 EndProject
-Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Silk.NET.Windowing.Common", "sources\Windowing\Common\Silk.NET.Windowing.Common.csproj", "{D1542DA9-7C7D-417C-8B63-791570D4C4A0}"
-EndProject
 Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Silk.NET.Windowing", "sources\Windowing\Windowing\Silk.NET.Windowing.csproj", "{6B3A9BCC-8EBF-4132-B306-8E275D05CB52}"
 EndProject
 Global
@@ -144,10 +142,6 @@ Global
 		{D2B9C43F-A80D-4C9A-9643-BC1AC1B4E807}.Debug|Any CPU.Build.0 = Debug|Any CPU
 		{D2B9C43F-A80D-4C9A-9643-BC1AC1B4E807}.Release|Any CPU.ActiveCfg = Release|Any CPU
 		{D2B9C43F-A80D-4C9A-9643-BC1AC1B4E807}.Release|Any CPU.Build.0 = Release|Any CPU
-		{D1542DA9-7C7D-417C-8B63-791570D4C4A0}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
-		{D1542DA9-7C7D-417C-8B63-791570D4C4A0}.Debug|Any CPU.Build.0 = Debug|Any CPU
-		{D1542DA9-7C7D-417C-8B63-791570D4C4A0}.Release|Any CPU.ActiveCfg = Release|Any CPU
-		{D1542DA9-7C7D-417C-8B63-791570D4C4A0}.Release|Any CPU.Build.0 = Release|Any CPU
 		{6B3A9BCC-8EBF-4132-B306-8E275D05CB52}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
 		{6B3A9BCC-8EBF-4132-B306-8E275D05CB52}.Debug|Any CPU.Build.0 = Debug|Any CPU
 		{6B3A9BCC-8EBF-4132-B306-8E275D05CB52}.Release|Any CPU.ActiveCfg = Release|Any CPU
@@ -179,7 +173,6 @@ Global
 		{D2B9C43F-A80D-4C9A-9643-BC1AC1B4E807} = {49D426BF-A009-43D5-A9E2-EFAAAA7196FC}
 		{600D712C-4ABF-44C4-96C3-B1DEE1F38298} = {AB25C482-DA9D-4335-8E26-2F29C3700152}
 		{AE84F4C8-6102-4A72-86EF-0C9345AA27A9} = {DD29EA8F-B1A6-45AA-8D2E-B38DA56D9EF6}
-		{D1542DA9-7C7D-417C-8B63-791570D4C4A0} = {AE84F4C8-6102-4A72-86EF-0C9345AA27A9}
 		{6B3A9BCC-8EBF-4132-B306-8E275D05CB52} = {AE84F4C8-6102-4A72-86EF-0C9345AA27A9}
 	EndGlobalSection
 	GlobalSection(ExtensibilityGlobals) = postSolution

sources/Core/Core/Abstractions/IGLContext.cs

@@ -17,6 +17,15 @@ public interface IGLContext : INativeContext
     /// </summary>
     int SwapInterval { get; set; }
 
+    /// <summary>
+    /// Gets or sets a value indicating whether <see cref="SwapInterval" /> is non-zero.
+    /// </summary>
+    bool VSync
+    {
+        get => SwapInterval > 0;
+        set => SwapInterval = value ? 1 : 0;
+    }
+
     /// <summary>
     /// Swaps the backbuffer to present the contents to the window.
     /// </summary>

sources/Core/Core/Abstractions/IGLContextSource.cs

@@ -0,0 +1,16 @@
+// 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.Core;
+
+/// <summary>
+/// Represents a source of a <see cref="IGLContext" />
+/// </summary>
+// Same as in 1.X/2.X, just a different namespace.
+public interface IGLContextSource
+{
+    /// <summary>
+    /// The OpenGL context.
+    /// </summary>
+    IGLContext? GLContext { get; }
+}

sources/Core/Core/Abstractions/INativeWindow.cs

@@ -0,0 +1,22 @@
+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MIT license.
+
+using System.Diagnostics.CodeAnalysis;
+
+namespace Silk.NET.Core;
+
+/// <summary>
+/// Represents a window that possesses native handles or other platform-specific information.
+/// </summary>
+public interface INativeWindow
+{
+    /// <summary>
+    /// Attempts to obtain native platform information with type <typeparamref name="TPlatformInfo" />.
+    /// </summary>
+    /// <param name="info">
+    /// The platform-specific information, or <c>default</c> if the platform-specific information is not available for
+    /// this platform.
+    /// </param>
+    /// <returns>True if <paramref name="info" /> contains the platform-specific information, false otherwise.</returns>
+    bool TryGetPlatformInfo<TPlatformInfo>([NotNullWhen(true)] out TPlatformInfo? info);
+}

sources/Playground/Program.cs

@@ -1,6 +1,7 @@
 // See https://aka.ms/new-console-template for more information
 
 using System.Runtime.InteropServices;
+using Silk.NET.Core;
 using Silk.NET.OpenGL;
 using Silk.NET.SDL;
 
@@ -12,12 +13,31 @@
     );
 }
 
-var window = Sdl.CreateWindow("Hello Window!", 1000, 800, Sdl.WindowOpengl);
+var window = Sdl.CreateWindow(
+    "Hello Window!",
+    1000,
+    800,
+    Sdl.WindowOpengl | Sdl.WindowHighPixelDensity
+);
 if (window == nullptr)
 {
     throw new Exception($"failed to create window: {(string)Sdl.GetError()}");
 }
 
+Console.WriteLine(
+    $"SDL_GetDisplayContentScale {Sdl.GetDisplayContentScale(Sdl.GetDisplayForWindow(window))}"
+);
+Console.WriteLine($"SDL_GetWindowDisplayScale {Sdl.GetWindowDisplayScale(window)}");
+Console.WriteLine($"SDL_GetWindowPixelDensity {Sdl.GetWindowPixelDensity(window)}");
+int sx = 0,
+    sy = 0,
+    px = 0,
+    py = 0;
+Sdl.GetWindowSize(window, sx.AsRef(), sy.AsRef());
+Sdl.GetWindowSizeInPixels(window, px.AsRef(), py.AsRef());
+Console.WriteLine($"SDL_GetWindowSize {sx} {sy}");
+Console.WriteLine($"SDL_GetWindowSizeInPixels {px} {py}");
+
 var context = new SdlContext(
     window,
     new KeyValuePair<GLattr, int>(GLattr.ContextMajorVersion, 3),
@@ -86,6 +106,23 @@ void main()
         break;
     }
 
+    if (@event.Window.Type == EventType.WindowDisplayScaleChanged)
+    {
+        Console.WriteLine(
+            $"SDL_GetDisplayContentScale {Sdl.GetDisplayContentScale(Sdl.GetDisplayForWindow(window))}"
+        );
+        Console.WriteLine($"SDL_GetWindowDisplayScale {Sdl.GetWindowDisplayScale(window)}");
+        Console.WriteLine($"SDL_GetWindowPixelDensity {Sdl.GetWindowPixelDensity(window)}");
+    }
+
+    if (@event.Window.Type == EventType.WindowResized)
+    {
+        Sdl.GetWindowSize(window, sx.AsRef(), sy.AsRef());
+        Sdl.GetWindowSizeInPixels(window, px.AsRef(), py.AsRef());
+        Console.WriteLine($"SDL_GetWindowSize {sx} {sy}");
+        Console.WriteLine($"SDL_GetWindowSizeInPixels {px} {py}");
+    }
+
     GL.Clear(ClearBufferMask.ColorBufferBit);
     GL.DrawArrays(PrimitiveType.Triangles, 0, 3);
     context.SwapBuffers();