Add a frame timer

src/main.rs

@@ -6,6 +6,7 @@ extern crate load_file;
 
 use glium::texture::SrgbTexture2d;
 use std::io::Cursor;
+use std::time::Instant;
 
 #[allow(unused_imports)]
 use glium::{glutin, Surface};
@@ -237,6 +238,7 @@ fn main() {
         };
 
         // drawing a frame
+        let start = Instant::now();
         let mut target = display.draw();
         target.clear_color_and_depth((0.0, 0.0, 0.0, 0.0), 1.0);
         target
@@ -249,6 +251,8 @@ fn main() {
             )
             .unwrap();
         target.finish().unwrap();
+        let duration = start.elapsed();
+        println!("Time elapsed is: {:?}", duration);
 
         let mut action = support::Action::Continue;