Implemented Viewport support

README.md

@@ -1,7 +1,11 @@
 # Fabric ImGui Example Mod
+This example contains the following features:
+- Basic ImGui/ImPlot Usage
+- Custom Font Rendering
+- Basic Viewport implementation
+- Image loading into ImGui
 
 ## Setup
-
 For setup instructions please see the [fabric wiki page](https://fabricmc.net/wiki/tutorial:setup) that relates to the IDE that you are using.
 
 ## ImGui usage
@@ -15,8 +19,6 @@ ImGuiImpl.draw(io -> {
 });
 ```
 Keep in mind that ImGui needs to be initialized, so you must not remove the MinecraftClient mixin in the ImGui package
-**The ImGuiImpl also contains a basic font loading base**
 
 ## License
-
 This template is available under the CC0 license. Feel free to learn from it and incorporate it in your own projects.

src/main/java/de/florianmichael/imguiexample/imgui/ImGuiImpl.java

@@ -9,6 +9,7 @@
 import imgui.flag.ImGuiConfigFlags;
 import imgui.gl3.ImGuiImplGl3;
 import imgui.glfw.ImGuiImplGlfw;
+import org.lwjgl.glfw.GLFW;
 
 public class ImGuiImpl {
     private final static ImGuiImplGlfw imGuiImplGlfw = new ImGuiImplGlfw();
@@ -51,9 +52,11 @@ public static void create(final long handle) {
         // defaultFont = generatedFonts.get(30); // Font scale is 30
         // How you can apply the font then, you can see in ExampleMixin
 
-        imGuiImplGlfw.init(handle, true);
-
         data.setConfigFlags(ImGuiConfigFlags.DockingEnable);
+        // In case you want to enable Viewports on Windows, you have to do this instead of the above line:
+        // data.setConfigFlags(ImGuiConfigFlags.DockingEnable | ImGuiConfigFlags.ViewportsEnable);
+
+        imGuiImplGlfw.init(handle, true);
         imGuiImplGl3.init();
     }
 
@@ -64,6 +67,13 @@ public static void draw(final RenderInterface runnable) {
         ImGui.render();
 
         imGuiImplGl3.renderDrawData(ImGui.getDrawData());
+        if (ImGui.getIO().hasConfigFlags(ImGuiConfigFlags.ViewportsEnable)) {
+            final long pointer = GLFW.glfwGetCurrentContext();
+            ImGui.updatePlatformWindows();
+            ImGui.renderPlatformWindowsDefault();
+
+            GLFW.glfwMakeContextCurrent(pointer);
+        }
     }
 
 // https://gist.github.com/FlorianMichael/b9d5ea2a4cb89c99e6da7dad68524c07