The lighting is done better where I set it up once in the shader and then only change the camera spotlight when the camera moves.

17-refactor-bug-fix/src/camera.hpp

@@ -15,6 +15,7 @@ struct Camera {
   float lastY = 300;
   float fov = 45.0f;
   bool firstMouse = true;
+  bool dirty = true;
 
   glm::mat4 look_at();
   void forward();