Added ui labels for debugging and playability

Core/Window.cs

@@ -1,8 +1,10 @@
 using OpenTK.Graphics.OpenGL4;
+using OpenTK.Mathematics;
 using OpenTK.Windowing.Common;
 using OpenTK.Windowing.Desktop;
 using OpenTK.Windowing.GraphicsLibraryFramework;
 using Voxel.Graphics;
+using Voxel.UI;
 
 namespace Voxel.Core
 {
@@ -16,6 +18,8 @@ namespace Voxel.Core
         public event Action<float, float> Update;
         public event Action Tick;
 
+        private Label _fpsLabel = new Label("FPS: N/A", 16, 16, 24, Vector4.One);
+
         private double _tickTime;
         public const double TICK_LENGTH = 1.0 / 20.0; // 20 TPS
 
@@ -55,14 +59,18 @@ namespace Voxel.Core
             timeElapsed += e.Time;
             float alpha = (float)(_tickTime / Window.TICK_LENGTH);
             float deltaTime = (float)e.Time;
+
             if (timeElapsed >= 1)
             {
                 Console.WriteLine("FPS: " + frames.ToString());
+                _fpsLabel.Text = $"FPS: {frames}";
                 timeElapsed = 0;
                 frames = 0;
             }
 
             Update.Invoke(deltaTime, alpha);
+            
+            Renderer.RenderLabel(_fpsLabel);
 
             Renderer.Render();