[Build] Use RuntimeIdentifier to separate graphics API runtimes

Targets/Xenko.targets

@@ -212,6 +212,7 @@
     <ItemGroup>
       <_XenkoDepsFile Include="@(ReferencePath->'%(RootDir)%(Directory)%(Filename).ssdeps')" Condition="'%(CopyLocal)' != 'false' And Exists('%(RootDir)%(Directory)%(Filename).ssdeps')"/>
       <_XenkoDepsFile Include="@(ReferenceDependencyPaths->'%(RootDir)%(Directory)%(Filename).ssdeps')" Condition="'%(CopyLocal)' != 'false' And Exists('%(RootDir)%(Directory)%(Filename).ssdeps')"/>
+      <None Include="@(_XenkoDepsFile)" CopyToOutputDirectory="PreserveNewest" />
     </ItemGroup>
   </Target>
 

build/Xenko.sln

@@ -136,14 +136,17 @@ Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "Xenko.Engine", "..\sources\
 	EndProjectSection
 EndProject
 Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "Xenko.Graphics", "..\sources\engine\Xenko.Graphics\Xenko.Graphics.csproj", "{FB06C76A-6BB7-40BE-9AFA-FEC13B045FB5}"
+	ProjectSection(ProjectDependencies) = postProject
+		{1E54A9A2-4439-4444-AE57-6D2ED3C0DC47} = {1E54A9A2-4439-4444-AE57-6D2ED3C0DC47}
+	EndProjectSection
 EndProject
 Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "Xenko.Engine.Tests.Windows", "..\sources\engine\Xenko.Engine.Tests\Xenko.Engine.Tests.Windows.csproj", "{A8F8D125-7A22-489F-99BC-9A02F545A17F}"
 	ProjectSection(ProjectDependencies) = postProject
 		{39AE9C77-E94B-404F-8768-B6261B3C1E0E} = {39AE9C77-E94B-404F-8768-B6261B3C1E0E}
 		{50D1A3BB-4B41-4EF5-8D2F-3618A3B6C698} = {50D1A3BB-4B41-4EF5-8D2F-3618A3B6C698}
 	EndProjectSection
 EndProject
-Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Xenko.Input.Tests.Windows", "..\sources\engine\Xenko.Input.Tests\Xenko.Input.Tests.Windows.csproj", "{01700344-CF44-482C-BEBC-60213B0F844C}"
+Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "Xenko.Input.Tests.Windows", "..\sources\engine\Xenko.Input.Tests\Xenko.Input.Tests.Windows.csproj", "{01700344-CF44-482C-BEBC-60213B0F844C}"
 	ProjectSection(ProjectDependencies) = postProject
 		{84DEB606-77ED-49CD-9AED-D2B13C1F5A1E} = {84DEB606-77ED-49CD-9AED-D2B13C1F5A1E}
 		{1677B922-CCF0-44DE-B57E-1CDD3D2B8E8A} = {1677B922-CCF0-44DE-B57E-1CDD3D2B8E8A}
@@ -155,7 +158,7 @@ Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Xenko.Input.Tests.Windows",
 		{42780CBD-3FE7-48E3-BD5B-59945EA20137} = {42780CBD-3FE7-48E3-BD5B-59945EA20137}
 	EndProjectSection
 EndProject
-Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Xenko.Core.Tests", "..\sources\core\Xenko.Core.Tests\Xenko.Core.Tests.csproj", "{5AA408BA-E766-453E-B661-E3D7EC46E2A6}"
+Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "Xenko.Core.Tests", "..\sources\core\Xenko.Core.Tests\Xenko.Core.Tests.csproj", "{5AA408BA-E766-453E-B661-E3D7EC46E2A6}"
 EndProject
 Project("{8BC9CEB8-8B4A-11D0-8D11-00A0C91BC942}") = "Xenko.Importer.FBX", "..\sources\tools\Xenko.Importer.FBX\Xenko.Importer.FBX.vcxproj", "{0467D515-FD66-4B8A-A128-CB642C2ED03F}"
 EndProject
@@ -185,7 +188,7 @@ Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "Xenko.TextureConverter.Test
 EndProject
 Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "Xenko.ProjectGenerator", "..\sources\tools\Xenko.ProjectGenerator\Xenko.ProjectGenerator.csproj", "{4B299721-18EA-4B6D-AFD5-2D6E188B97BD}"
 EndProject
-Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Xenko.Audio.Tests.Windows", "..\sources\engine\Xenko.Audio.Tests\Xenko.Audio.Tests.Windows.csproj", "{7AF4B563-AAD3-42FF-B91E-84B9D34D904A}"
+Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "Xenko.Audio.Tests.Windows", "..\sources\engine\Xenko.Audio.Tests\Xenko.Audio.Tests.Windows.csproj", "{7AF4B563-AAD3-42FF-B91E-84B9D34D904A}"
 	ProjectSection(ProjectDependencies) = postProject
 		{50D1A3BB-4B41-4EF5-8D2F-3618A3B6C698} = {50D1A3BB-4B41-4EF5-8D2F-3618A3B6C698}
 	EndProjectSection
@@ -3933,6 +3936,7 @@ Global
 		{6F473FA6-4F8B-4FBA-AE33-EE5AF997D50C} = {1AE1AC60-5D2F-4CA7-AE20-888F44551185}
 		{4A15BAAD-AA37-4754-A2BF-8D4049211E36} = {1AE1AC60-5D2F-4CA7-AE20-888F44551185}
 		{1AC70118-C90F-4EC6-9D8B-C628BDF900F7} = {4C142567-C42B-40F5-B092-798882190209}
+		{2FCA2D8B-B10F-4DCA-9847-4221F74BA586} = {5D2D3BE8-9910-45CA-8E45-95660DA4C563}
 		{C121A566-555E-42B9-9B0A-1696529A9088} = {4C142567-C42B-40F5-B092-798882190209}
 		{FB06C76A-6BB7-40BE-9AFA-FEC13B045FB5} = {4C142567-C42B-40F5-B092-798882190209}
 		{A8F8D125-7A22-489F-99BC-9A02F545A17F} = {A7ED9F01-7D78-4381-90A6-D50E51C17250}
@@ -3975,7 +3979,6 @@ Global
 		{50D1A3BB-4B41-4EF5-8D2F-3618A3B6C698} = {A2A4342E-024B-4063-B10C-1DA96CA3046D}
 		{7DBC5A0B-76F5-4D9E-9798-540DA214099C} = {860946E4-CC77-4FDA-A4FD-3DB2A502A696}
 		{117BF9F8-D2D9-4D32-9702-251C3E038090} = {A47B451D-3162-410F-BAF7-C650C4B7A4B0}
-		{2FCA2D8B-B10F-4DCA-9847-4221F74BA586} = {5D2D3BE8-9910-45CA-8E45-95660DA4C563}
 		{C904D2C6-5A15-4E0B-8432-33967E1735AA} = {F765035E-F4F4-4CFA-BA02-755DC677AA97}
 		{49AAA22D-D1C8-4E0F-82E8-F462D5442463} = {52AE329E-B588-40D0-A578-8D0DB1BD83E5}
 		{BB9DEEEF-F18C-40D8-B016-6434CC71B8C3} = {4C142567-C42B-40F5-B092-798882190209}

sources/assets/Xenko.Core.Assets.CompilerApp/NuGetAssemblyResolver.cs

@@ -48,7 +48,7 @@ internal static void __Initialize__()
                 {
                     new LibraryDependency
                     {
-                        LibraryRange = new LibraryRange(Assembly.GetEntryAssembly().GetName().Name, new VersionRange(new NuGetVersion(XenkoVersion.NuGetVersion)), LibraryDependencyTarget.Package),
+                        LibraryRange = new LibraryRange(Assembly.GetExecutingAssembly().GetName().Name, new VersionRange(new NuGetVersion(XenkoVersion.NuGetVersion)), LibraryDependencyTarget.Package),
                     }
                 },
                 TargetFrameworks =
@@ -68,6 +68,7 @@ internal static void __Initialize__()
                 var request = new RestoreRequest(spec, provider, context, logger)
                 {
                     LockFilePath = "project.lock.json",
+                    RequestedRuntimes = { "win7-d3d11" },
                 };
 
                 var command = new RestoreCommand(request);
@@ -82,7 +83,9 @@ internal static void __Initialize__()
                 {
                     foreach (var file in library.Files)
                     {
-                        if (file.StartsWith("lib/net"))
+                        var extension = Path.GetExtension(file).ToLowerInvariant();
+                        if ((file.StartsWith("runtimes/win-d3d11/lib/net") || file.StartsWith("lib/net"))
+                            && (extension == ".dll" || extension == ".exe"))
                         {
                             assemblies.Add(Path.Combine(installPath, library.Path, file));
                         }

sources/core/Xenko.Core/build/Xenko.Core.targets

@@ -42,7 +42,7 @@
   <Target Name="XenkoRunAssemblyProcessor" DependsOnTargets="ResolveAssemblyReferences">
     <WriteLinesToFile File="$(IntermediateOutputPath)XenkoReferences.cache" Lines="@(ReferencePath)" Overwrite="true" />
     <ItemGroup>
-      <XenkoAddReference Include="@(ReferencePath)" Condition="'%(ReferencePath.ExternallyResolved)' == 'true'" />
+      <XenkoAddReference Include="@(ReferencePath)" Condition="'%(ReferencePath.ExternallyResolved)' == 'true' Or '%(ReferencePath.BuildReference)' == 'true'" />
     </ItemGroup>
     <PropertyGroup>
       <XenkoAssemblyProcessorOptions Condition="'$(XenkoAssemblyProcessorOptions)' == ''">--auto-notify-property --parameter-key --auto-module-initializer --serialization</XenkoAssemblyProcessorOptions>
@@ -66,4 +66,67 @@
       $(PrepareForRunDependsOn)
     </PrepareForRunDependsOn>
   </PropertyGroup>
+
+  <!-- 
+  *****************************************************************************************************************************
+  Dependencies reading (from .ssdeps)
+  Important: Please keep in sync with Xenko.Core.PostSettings.Dependencies.Targets
+  *****************************************************************************************************************************
+  -->
+  <!-- List dependency files from .ssdeps -->
+  <Target Name="_XenkoListDepsFiles" DependsOnTargets="ResolveAssemblyReferences;ResolvePackageAssets">
+    <ItemGroup>
+      <_XenkoDepsFile Include="@(ReferencePath->'%(RootDir)%(Directory)%(Filename).ssdeps')" Condition="'%(CopyLocal)' != 'false' And Exists('%(RootDir)%(Directory)%(Filename).ssdeps')"/>
+      <_XenkoDepsFile Include="@(ReferenceDependencyPaths->'%(RootDir)%(Directory)%(Filename).ssdeps')" Condition="'%(CopyLocal)' != 'false' And Exists('%(RootDir)%(Directory)%(Filename).ssdeps')"/>
+      <_XenkoDepsFile Include="@(RuntimeCopyLocalItems->'%(RootDir)%(Directory)%(Filename).ssdeps')" Condition="Exists('%(RootDir)%(Directory)%(Filename).ssdeps')"/>
+      <None Include="@(_XenkoDepsFile)" CopyToOutputDirectory="PreserveNewest" />
+    </ItemGroup>
+  </Target>
+
+  <!-- Note: this target Outputs are not real, used so that it gets expanded for each file
+             also, if _XenkoDepsFile is empty the target is still called so check for it -->
+  <Target Name="_XenkoBuildDependencies" DependsOnTargets="_XenkoListDepsFiles" Outputs="%(_XenkoDepsFile.Identity)">
+    <!-- Read dependencies from file -->
+    <ReadLinesFromFile File="%(_XenkoDepsFile.Identity)" Condition="'%(_XenkoDepsFile.Identity)' != ''">
+      <Output TaskParameter="Lines" ItemName="_XenkoDependencyLocal"/>
+    </ReadLinesFromFile>
+    <PropertyGroup>
+      <_XenkoSourceDir>%(_XenkoDepsFile.RootDir)%(_XenkoDepsFile.Directory)</_XenkoSourceDir>
+    </PropertyGroup>
+    <ItemGroup>
+      <_XenkoDependencyLocal>
+        <!-- Note: Using regex match rather than regex split or string split to avoid MSBuild MissingMethodException -->
+        <Type>$([System.Text.RegularExpressions.Regex]::Match('%(Identity)', `(.*);(.*);(.*)`).get_Groups().get_Item(1).ToString())</Type>
+        <SourcePath>$([System.Text.RegularExpressions.Regex]::Match('%(Identity)', `(.*);(.*);(.*)`).get_Groups().get_Item(2).ToString())</SourcePath>
+        <Link>$([System.Text.RegularExpressions.Regex]::Match('%(Identity)', `(.*);(.*);(.*)`).get_Groups().get_Item(3).ToString())</Link>
+        <CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>
+      </_XenkoDependencyLocal>
+      <_XenkoDependencyContent Include="@(_XenkoDependencyLocal->'$(_XenkoSourceDir)%(SourcePath)')" Condition="'%(_XenkoDependencyLocal.Type)' == 'Content'"/>
+      <_XenkoDependencyNativeLib Include="@(_XenkoDependencyLocal->'$(_XenkoSourceDir)%(SourcePath)')" Condition="'%(_XenkoDependencyLocal.Type)' == 'NativeLib'"/>
+    </ItemGroup>
+
+    <!-- Message -->
+    <Message Importance="Normal" Text="Detected dependency from %(_XenkoDepsFile.FileName)" Condition="'%(_XenkoDepsFile.Identity)' != ''"/>
+    <Message Importance="Normal" Text="  %(_XenkoDependencyLocal.Type): %(_XenkoDependencyLocal.Identity) => %(_XenkoDependencyLocal.Link)"/>
+
+    <!-- Cleanup so that _XenkoDependencyLocal is local -->
+    <ItemGroup>
+      <_XenkoDependencyLocal Remove="@(_XenkoDependencyLocal)"/>
+    </ItemGroup>
+  </Target>
+
+  <Target Name="_XenkoCopyContent" DependsOnTargets="_XenkoBuildDependencies" AfterTargets="ResolveAssemblyReferences">
+    <ItemGroup>
+      <Content Include="@(_XenkoDependencyContent)"/>
+    </ItemGroup>
+  </Target>
+
+  <!-- Copy native libraries to output -->
+  <Target Name="_XenkoSetupNativeLibraries" DependsOnTargets="_XenkoBuildDependencies" AfterTargets="ResolveAssemblyReferences" Condition="'$(XenkoPlatform)' == 'Windows'">
+    <ItemGroup>
+      <None Include="@(_XenkoDependencyNativeLib)">
+        <CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>
+      </None>
+    </ItemGroup>
+  </Target>
 </Project>

sources/engine/Xenko.Engine/Rendering/Compositing/ForwardRenderer.cs

@@ -652,8 +652,8 @@ protected override void DrawCore(RenderContext context, RenderDrawContext drawCo
 
                             for (var i = 0; i < 2; i++)
                             {
-#if XENKO_GRAPHICS_API_DIRECT3D11 && XENKO_PLATFORM_UWP
-                                if (drawContext.GraphicsDevice.Presenter is WindowsMixedRealityGraphicsPresenter graphicsPresenter)
+#if XENKO_PLATFORM_UWP
+                                if (GraphicsDevice.Platform == GraphicsPlatform.Direct3D11 && drawContext.GraphicsDevice.Presenter is WindowsMixedRealityGraphicsPresenter graphicsPresenter)
                                 {
                                     isWindowsMixedReality = true;
 

sources/engine/Xenko.Games/GameContext.cs

@@ -113,9 +113,7 @@ public static string ProductLocation
 
         // This code is for backward compatibility only where the generated games
         // would not explicitly create the context, but would just use a Winform
-#if XENKO_PLATFORM_WINDOWS_DESKTOP
-#if (XENKO_UI_WINFORMS || XENKO_UI_WPF)
-        /// <summary>
+#if XENKO_PLATFORM_WINDOWS_DESKTOP && (XENKO_UI_WINFORMS || XENKO_UI_WPF)        /// <summary>
         /// Performs an implicit conversion from <see cref="Control"/> to <see cref="GameContextWinforms"/>.
         /// </summary>
         /// <param name="control">Winform control</param>
@@ -125,8 +123,9 @@ public static string ProductLocation
         {
             return new GameContextWinforms(control);
         }
+#endif
 
-#if XENKO_GRAPHICS_API_OPENGL
+#if (XENKO_PLATFORM_WINDOWS_DESKTOP || XENKO_PLATFORM_UNIX) && XENKO_GRAPHICS_API_OPENGL && XENKO_UI_OPENTK
         /// <summary>
         /// Performs an implicit conversion from <see cref="OpenTK.GameWindow"/> to <see cref="GameContextOpenTK"/>.
         /// </summary>
@@ -137,8 +136,6 @@ public static string ProductLocation
         {
             return new GameContextOpenTK(gameWindow);
         }
-#endif
-#endif
 #endif
     }
 

sources/engine/Xenko.Games/Xenko.Games.csproj

@@ -21,6 +21,26 @@
     </When>
   </Choose>
   <Import Condition="$(XenkoUI.Contains('SDL'))" Project="..\..\targets\SDL.targets" />
+  <Choose>
+    <When Condition="$(XenkoUI.Contains('WINFORMS')) OR $(XenkoUI.Contains('WPF'))">
+      <ItemGroup>
+        <Reference Include="System.Windows.Forms" />
+      </ItemGroup>
+    </When>
+  </Choose>
+  <Choose>
+    <When Condition=" '$(XenkoGraphicsApi)' == 'OpenGL' Or '$(XenkoGraphicsApi)' == 'OpenGLES' ">
+      <Choose>
+        <When Condition=" '$(XenkoPlatform)' == 'Windows' ">
+          <ItemGroup>
+            <Reference Include="OpenTK" Private="True">
+              <HintPath>$(XenkoDependenciesDir)OpenTK\OpenTK.dll</HintPath>
+            </Reference>
+          </ItemGroup>
+        </When>
+      </Choose>
+    </When>
+  </Choose>
   <ItemGroup>
     <Compile Include="..\..\shared\SharedAssemblyInfo.cs">
       <Link>Properties\SharedAssemblyInfo.cs</Link>

sources/engine/Xenko.Graphics/Xenko.Graphics.csproj

@@ -1,4 +1,4 @@
-<Project>
+<Project>
   <PropertyGroup>
     <XenkoAssemblySign>true</XenkoAssemblySign>
     <XenkoGraphicsApiDependent>true</XenkoGraphicsApiDependent>
@@ -22,6 +22,34 @@
   </Choose>
   <Import Condition="$(XenkoUI.Contains('SDL'))" Project="..\..\targets\SDL.targets" />
   <Choose>
+    <When Condition=" '$(XenkoGraphicsApi)' == 'OpenGL' Or '$(XenkoGraphicsApi)' == 'OpenGLES' ">
+      <Choose>
+        <When Condition="('$(XenkoPlatform)' == 'Linux') or ('$(XenkoPlatform)' == 'macOS')">
+          <ItemGroup>
+            <Reference Include="OpenTK">
+              <HintPath Condition="'$(XenkoRuntime)' == ''">$(XenkoDependenciesDir)OpenTK\$(XenkoPlatform)\OpenTK.dll</HintPath>
+              <HintPath Condition="'$(XenkoRuntime)' != ''">$(XenkoDependenciesDir)OpenTK\$(XenkoRuntime)\$(XenkoPlatform)\OpenTK.dll</HintPath>
+            </Reference>
+          </ItemGroup>
+        </When>
+        <When Condition=" '$(XenkoPlatform)' == 'Windows' ">
+          <ItemGroup>
+            <Reference Include="OpenTK">
+              <HintPath Condition="'$(XenkoRuntime)' == ''">$(XenkoDependenciesDir)OpenTK\OpenTK.dll</HintPath>
+              <HintPath Condition="'$(XenkoRuntime)' == 'CoreCLR'">$(XenkoDependenciesDir)OpenTK\$(XenkoRuntime)\$(XenkoPlatform)\OpenTK.dll</HintPath>
+            </Reference>
+          </ItemGroup>
+        </When>
+        <When Condition=" '$(XenkoPlatform)' == 'Android' Or '$(XenkoPlatform)' == 'iOS' ">
+          <ItemGroup>
+            <Reference Include="OpenTK-1.1">
+              <HintPath Condition="'$(XenkoPlatform)' == 'Android'">$(XenkoDependenciesDir)OpenTK\Android\OpenTK-1.1.dll</HintPath>
+              <HintPath Condition="'$(XenkoPlatform)' == 'iOS'">$(XenkoDependenciesDir)OpenTK\iOS\OpenTK-1.1.dll</HintPath>
+            </Reference>
+          </ItemGroup>
+        </When>
+      </Choose>
+    </When>
     <When Condition=" '$(XenkoGraphicsApi)' == 'Vulkan' ">
       <Choose>
         <When Condition=" '$(XenkoPlatform)' == 'Windows'">
@@ -195,6 +223,7 @@
     <ProjectReference Include="..\Xenko.Native\Xenko.Native.csproj" />
     <ProjectReference Include="..\Xenko.Shaders\Xenko.Shaders.csproj" />
     <ProjectReference Include="..\Xenko\Xenko.csproj" />
+    <PackageReference Include="Microsoft.NETCore.Platforms" Version="2.1.1" />
     <PackageReference Include="SharpDX.Direct3D11" Version="4.0.1" Condition="'$(XenkoGraphicsApi)' == 'Direct3D11'" />
     <PackageReference Include="SharpDX.Direct3D12" Version="4.0.1" Condition="'$(XenkoGraphicsApi)' == 'Direct3D12'" />
     <PackageReference Include="SharpDX.D3DCompiler" Version="4.0.1" Condition="'$(XenkoGraphicsApi)' == 'Direct3D11' Or '$(XenkoGraphicsApi)' == 'Direct3D12'" />
@@ -211,6 +240,7 @@
   </ItemGroup>
   <ItemGroup />
   <ItemGroup>
+    <None Include="runtime.json" Pack="true" PackagePath="/" />
     <None Include="Shaders.Bytecodes\CompileShaders.cmd" />
     <None Include="Shaders.Bytecodes\Graphics.xkpkg" />
     <None Include="Shaders.Bytecodes\Shaders.xkeffectlog" />
@@ -293,7 +323,9 @@
   <Target Name="IncludeExtraAssemblies">
     <ItemGroup>
       <BuildOutputInPackage Include="$(OutputPath)SharpFont.dll" />
-      <BuildOutputInPackage Include="$(OutputPath)SDL2-CS.dll" />
+      <BuildOutputInPackage Include="$(OutputPath)SharpVulkan.dll" Condition=" '$(XenkoGraphicsApi)' == 'Vulkan' " />
+      <BuildOutputInPackage Include="$(OutputPath)OpenTK*.dll" Condition=" '$(XenkoGraphicsApi)' == 'OpenGL' " />
+      <BuildOutputInPackage Include="$(OutputPath)SDL2-CS.dll" Condition="$(XenkoUI.Contains('SDL'))" />
     </ItemGroup>
   </Target>
 </Project>

sources/engine/Xenko.Graphics/runtime.json

@@ -0,0 +1,19 @@
+{
+    "runtimes": {
+        "win": {
+            "#import": [
+                "win-d3d"
+            ]
+        },
+        "win-d3d": {
+            "#import": [
+                "win"
+            ]
+        },
+        "win-opengl": {
+            "#import": [
+                "win"
+            ]
+        }
+    }
+}

sources/engine/Xenko.Input/Xenko.Input.csproj

@@ -1,4 +1,4 @@
-<Project>
+<Project>
   <PropertyGroup>
     <XenkoAssemblySign>true</XenkoAssemblySign>
     <XenkoGraphicsApiDependent>true</XenkoGraphicsApiDependent>
@@ -18,6 +18,13 @@
     </When>
   </Choose>
   <Import Condition="$(XenkoUI.Contains('SDL'))" Project="..\..\targets\SDL.targets" />
+  <Choose>
+    <When Condition="$(XenkoUI.Contains('WINFORMS')) OR $(XenkoUI.Contains('WPF'))">
+      <ItemGroup>
+        <Reference Include="System.Windows.Forms" />
+      </ItemGroup>
+    </When>
+  </Choose>
   <ItemGroup>
     <Compile Include="..\..\shared\SharedAssemblyInfo.cs">
       <Link>Properties\SharedAssemblyInfo.cs</Link>