feat: first interface WIP

Dalamud/Interface/InterfaceManager.cs

@@ -0,0 +1,56 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using ImGuiNET;
+using ImGuiScene;
+using SDL2;
+
+namespace Dalamud.Interface
+{
+    public class InterfaceManager : IDisposable
+    {
+        private Task _task;
+
+        public void Dispose()
+        {
+            _task?.Wait();
+            _task = null;
+        }
+
+        public void Start()
+        {
+            if (_task == null || _task.IsCompleted || _task.IsFaulted || _task.IsCanceled)
+            {
+                _task = new Task(Display);
+                _task.Start();
+            }
+        }
+
+        private void Display()
+        {
+            using (var scene = new SimpleImGuiScene("Debug", fullscreen: true))
+            {
+                scene.Window.MakeTransparent(SimpleSDLWindow.CreateColorKey(0, 0, 0));
+
+                scene.Window.OnSDLEvent += (ref SDL.SDL_Event sdlEvent) =>
+                {
+                    if (sdlEvent.type == SDL.SDL_EventType.SDL_KEYDOWN && sdlEvent.key.keysym.scancode == SDL.SDL_Scancode.SDL_SCANCODE_ESCAPE)
+                    {
+                        scene.ShouldQuit = true;
+                    }
+                    return true;
+                };
+
+                scene.OnBuildUI += () =>
+                {
+                    ImGui.ShowDemoWindow();
+                };
+
+                scene.Run();
+            }
+        }
+
+    }
+}