Implement SDL platform, windowing and input handling

Source/ThirdParty/SDL/SDL.Build.cs

@@ -0,0 +1,53 @@
+// Copyright (c) 2012-2023 Wojciech Figat. All rights reserved.
+
+using System.IO;
+using Flax.Build;
+using Flax.Build.NativeCpp;
+
+/// <summary>
+/// https://www.libsdl.org/
+/// </summary>
+public class SDL : DepsModule
+{
+    /// <inheritdoc />
+    public override void Init()
+    {
+        base.Init();
+
+        LicenseType = LicenseTypes.Custom;
+        LicenseFilePath = "LICENSE.txt";
+
+        // Merge third-party modules into engine binary
+        BinaryModuleName = "FlaxEngine";
+    }
+
+    /// <inheritdoc />
+    public override void Setup(BuildOptions options)
+    {
+        base.Setup(options);
+
+        var depsRoot = options.DepsFolder;
+        switch (options.Platform.Target)
+        {
+        case TargetPlatform.Windows:
+            options.OutputFiles.Add(Path.Combine(depsRoot, "SDL3.lib"));
+            options.OptionalDependencyFiles.Add(Path.Combine(depsRoot, "SDL3.pdb"));
+            options.OptionalDependencyFiles.Add(Path.Combine(depsRoot, "SDL3.dll"));
+
+            // For static linkage
+            options.OutputFiles.Add("Setupapi.lib");
+            options.OutputFiles.Add("Version.lib");
+            options.OutputFiles.Add("Imm32.lib");
+            options.OutputFiles.Add("Gdi32.lib");
+
+            break;
+        case TargetPlatform.Linux:
+        case TargetPlatform.Mac:
+            options.OutputFiles.Add(Path.Combine(depsRoot, "libSDL3.a"));
+            break;
+        default: throw new InvalidPlatformException(options.Platform.Target);
+        }
+		
+		options.PublicIncludePaths.Add(Path.Combine(Globals.EngineRoot, @"Source\ThirdParty\SDL"));
+    }
+}