ImGui up and running

.gitignore

@@ -1,5 +1,6 @@
 .DS_Store
 FNA/
+ImGui.NET/
 fnalibs/
 project_name/bin
 project_name/obj

getFNA.sh

@@ -62,6 +62,35 @@ function updateFNA()
 	fi
 }
 
+
+# Clones FNA from the git master branch
+function downloadImGui()
+{
+    checkGit
+	echo "Downloading ImGui..."
+	git -C $MY_DIR clone https://github.com/mellinoe/ImGui.NET.git --recursive
+	if [ $? -eq 0 ]; then
+		echo "Finished downloading!\n"
+	else
+		echo >&2 "ERROR: Unable to download successfully. Maybe try again later?"
+	fi
+}
+
+# Pulls FNA from the git master branch
+function updateImGui()
+{
+    checkGit
+    echo "Updating to the latest git version of ImGui.NET..."
+	git -C "$MY_DIR/ImGui.NET" pull --recurse-submodules
+	if [ $? -eq 0 ]; then
+		echo "Finished updating!\n"
+	else
+		echo >&2 "ERROR: Unable to update."
+		exit 1
+	fi
+}
+
+
 # Downloads and extracts prepackaged archive of native libraries ("fnalibs")
 function getLibs()
 {
@@ -114,17 +143,36 @@ if [[ $shouldDownloadLibs =~ ^[Yy]$ ]]; then
     getLibs
 fi
 
+# Dear ImGui
+if [ ! -d "$MY_DIR/ImGui.NET" ]; then
+    read -p "Download ImGui.NET (y/n)? " shouldDownload
+    if [[ $shouldDownload =~ ^[Yy]$ ]]; then
+        downloadImGui
+    fi
+else
+    read -p "Update ImGui.NET (y/n)? " shouldUpdate
+    if [[ $shouldUpdate =~ ^[Yy]$ ]]; then
+        updateImGui
+    fi
+fi
+
 
 # install t4 engine
 installT4
 
 
-# Rename project
+
+# Only proceed from here if we have not yet renamed the project
 if [ ! -d "$MY_DIR/project_name" ]; then
 	# old project_name folder already renamed so we are all done here
 	exit 1
 fi
 
+# copy over ImGui files before renaming the project
+echo "Copying ImGui renderer to project..."
+cp "$MY_DIR/ImGui.NET/src/ImGui.NET.SampleProgram.XNA/DrawVertDeclaration.cs" "$MY_DIR/project_name/ImGui"
+cp "$MY_DIR/ImGui.NET/src/ImGui.NET.SampleProgram.XNA/ImGuiRenderer.cs" "$MY_DIR/project_name/ImGui"
+sed -i '' "s/cimgui/cimgui.dylib/g" ImGui.NET/src/ImGui.NET/Generated/ImGuiNative.gen.cs
 	
 read -p "Enter the project name to use for your folder and csproj file or 'exit' to quit: " newProjectName
 if [[ $newProjectName = 'exit' || -z "$newProjectName" ]]; then

project_name/ImGui/ImGuiFinalRenderDelegate.cs

@@ -0,0 +1,78 @@
+using System;
+using System.Reflection;
+using ImGuiNET;
+using ImGuiNET.SampleProgram.XNA;
+using Microsoft.Xna.Framework;
+using Microsoft.Xna.Framework.Graphics;
+
+namespace Nez
+{
+	public class ImGuiFinalRenderDelegate : IFinalRenderDelegate
+	{
+		public Scene scene { get; set; }
+
+        ImGuiRenderer _imGuiRenderer;
+        RenderTarget2D _lastRenderTarget;
+        IntPtr _renderTargetId;
+
+        public ImGuiFinalRenderDelegate()
+        {
+            var core = typeof(Core).GetField("_instance", BindingFlags.Static | BindingFlags.NonPublic).GetValue(null) as Core;
+            _imGuiRenderer = new ImGuiRenderer(core);
+            _imGuiRenderer.RebuildFontAtlas();
+        }
+
+		public void handleFinalRender( Color letterboxColor, RenderTarget2D source, Rectangle finalRenderDestinationRect, SamplerState samplerState )
+		{
+            if(_lastRenderTarget != source)
+            {
+                // unbind the old texture if we had one
+                if(_lastRenderTarget != null)
+                    _imGuiRenderer.UnbindTexture(_renderTargetId);
+
+                // bind the new texture
+                _lastRenderTarget = source;
+                _renderTargetId = _imGuiRenderer.BindTexture(source);
+            }
+
+            Core.graphicsDevice.setRenderTarget( null );
+            Core.graphicsDevice.Clear( letterboxColor );
+
+
+            _imGuiRenderer.BeforeLayout(new GameTime(TimeSpan.FromDays(0), TimeSpan.FromMilliseconds(Time.deltaTime * 1000)));
+            layoutGui();
+            _imGuiRenderer.AfterLayout();
+		}
+
+        void layoutGui()
+        {
+            ImGui.ShowDemoWindow();
+
+            var maxSize = new System.Numerics.Vector2(_lastRenderTarget.Width, _lastRenderTarget.Height);
+            var minSize = maxSize / 4;
+            unsafe
+            {
+                ImGui.SetNextWindowSizeConstraints(minSize, maxSize, data =>
+                {
+                    var size = (*data).CurrentSize;
+                    var ratio = size.X / _lastRenderTarget.Width;
+                    (*data).DesiredSize.Y = ratio * _lastRenderTarget.Height;
+                });
+            }
+
+            ImGui.SetNextWindowPos(new System.Numerics.Vector2(0, 0), ImGuiCond.FirstUseEver);
+            ImGui.Begin("Game Window");
+            ImGui.Image(_renderTargetId, ImGui.GetContentRegionAvail());
+            ImGui.End();
+        }
+
+		public void onAddedToScene()
+		{}
+
+		public void onSceneBackBufferSizeChanged( int newWidth, int newHeight )
+		{}
+
+		public void unload()
+		{}
+	}
+}

project_name/project_name.csproj

@@ -2,17 +2,19 @@
 
   <PropertyGroup>
     <OutputType>Exe</OutputType>
-    <TargetFramework>net46</TargetFramework>
+    <TargetFramework>net462</TargetFramework>
     <AppendTargetFrameworkToOutputPath>false</AppendTargetFrameworkToOutputPath>
     <PlatformTarget>AnyCPU</PlatformTarget>
     <AssemblyName>project_name</AssemblyName>
     <MonoGamePlatform>DesktopGL</MonoGamePlatform>
+		<AllowUnsafeBlocks>True</AllowUnsafeBlocks>
   </PropertyGroup>
 
   <!-- Reference FNA project -->
   <ItemGroup>
     <ProjectReference Include="../FNA/FNA.csproj" />
     <ProjectReference Include="../Nez.FNA/Nez.FNA/Nez.FNA.csproj" />
+		<ProjectReference Include="../ImGui.NET/src/ImGui.NET/ImGui.NET.csproj"/>
   </ItemGroup>
 
   <!-- Include the Content directory (except for .fx files, since we use .fxb at runtime) -->
@@ -67,4 +69,24 @@
 	</Content>
   </ItemGroup>
 	
+	<!-- Copy ImGui native code to output -->
+	<ItemGroup>
+    <Content Include="..\ImGui.NET\deps\cimgui\win-x86\*.*" Condition="'$(OS)' == 'Windows_NT' AND '$(Platform)' != 'x64'">
+      <Link>osx\%(RecursiveDir)%(Filename)%(Extension)</Link>
+      <CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>
+    </Content>
+    <Content Include="..\ImGui.NET\deps\cimgui\win-x64\*.*" Condition="'$(OS)' == 'Windows_NT' AND '$(Platform)' != 'x86'">
+      <Link>osx\%(RecursiveDir)%(Filename)%(Extension)</Link>
+      <CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>
+    </Content>
+    <Content Include="..\ImGui.NET\deps\cimgui\osx-x64\*.*" Condition="'$(OS)' != 'Windows_NT' AND $(IsOSX) == 'true'">
+      <Link>osx\%(RecursiveDir)%(Filename)%(Extension)</Link>
+      <CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>
+    </Content>
+    <Content Include="..\ImGui.NET\deps\cimgui\linux-x64\*.*" Condition="'$(OS)' != 'Windows_NT' AND $(IsLinux) == 'true'">
+      <Link>osx\%(RecursiveDir)%(Filename)%(Extension)</Link>
+      <CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>
+    </Content>
+  </ItemGroup>
+
 </Project>