Add project files.

Window.cs

@@ -0,0 +1,48 @@
+using OpenTK.Graphics.OpenGL4;
+using OpenTK.Windowing.Common;
+using OpenTK.Windowing.Desktop;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace Voxel
+{
+    public class Window(int width, int height, string title) : GameWindow(GameWindowSettings.Default, new NativeWindowSettings() { Size = (width, height), Title = title })
+    {
+        private Triangle _triangle;
+
+        protected override void OnUpdateFrame(FrameEventArgs args)
+        {
+            base.OnUpdateFrame(args);
+        }
+
+        protected override void OnRenderFrame(FrameEventArgs args)
+        {
+            base.OnRenderFrame(args);
+
+            GL.Clear(ClearBufferMask.ColorBufferBit);
+
+            _triangle.Draw();
+
+            SwapBuffers();
+        }
+
+        protected override void OnFramebufferResize(FramebufferResizeEventArgs e)
+        {
+            base.OnFramebufferResize(e);
+
+            GL.Viewport(0, 0, e.Width, e.Height);
+        }
+
+        protected override void OnLoad()
+        {
+            base.OnLoad();
+
+            _triangle = new Triangle();
+
+            GL.ClearColor(0.5f, 0.5f, 0.5f, 1f);
+        }
+    }
+}