Remove usage of the time crate (#183)

Replace calls to time::precise_time_s with std::time::Instant.

Also replaced the type of a time variable with std::time::Duration
because it played nicely with using Instant

Cargo.toml

@@ -27,7 +27,6 @@ cc = "1.0"
 
 [dependencies]
 cast = "0.2"
-time = "0.1.34"
 raw-window-handle = "0.3.3"
 
 [target.'cfg(windows)'.dependencies.winapi]

src/key_handler.rs

@@ -1,10 +1,11 @@
 use crate::{InputCallback, Key, KeyRepeat};
 use std::mem;
+use std::time::{Duration, Instant};
 
 pub struct KeyHandler {
     pub key_callback: Option<Box<dyn InputCallback>>,
-    prev_time: f64,
-    delta_time: f32,
+    prev_time: Instant,
+    delta_time: Duration,
     keys: [bool; 512],
     keys_prev: [bool; 512],
     keys_down_duration: [f32; 512],
@@ -19,8 +20,8 @@ impl KeyHandler {
             keys: [false; 512],
             keys_prev: [false; 512],
             keys_down_duration: [-1.0; 512],
-            prev_time: time::precise_time_s(),
-            delta_time: 0.0,
+            prev_time: Instant::now(),
+            delta_time: Duration::from_secs(0),
             key_repeat_delay: 0.250,
             key_repeat_rate: 0.050,
         }
@@ -49,10 +50,10 @@ impl KeyHandler {
     }
 
     pub fn update(&mut self) {
-        let current_time = time::precise_time_s();
-        let delta_time = (current_time - self.prev_time) as f32;
+        let current_time = Instant::now();
+        self.delta_time = self.prev_time.elapsed();
         self.prev_time = current_time;
-        self.delta_time = delta_time;
+        let delta_time = self.delta_time.as_secs_f32();
 
         for i in 0..self.keys.len() {
             if self.keys[i] {
@@ -128,10 +129,11 @@ impl KeyHandler {
         }
 
         if repeat == KeyRepeat::Yes && t > self.key_repeat_delay {
+            let delta_time = self.delta_time.as_secs_f32();
             let delay = self.key_repeat_delay;
             let rate = self.key_repeat_rate;
             if (((t - delay) % rate) > rate * 0.5)
-                != (((t - delay - self.delta_time) % rate) > rate * 0.5)
+                != (((t - delay - delta_time) % rate) > rate * 0.5)
             {
                 return true;
             }

src/rate.rs

@@ -1,8 +1,8 @@
-use std::time::Duration;
+use std::time::{Duration, Instant};
 
 pub struct UpdateRate {
     target_rate: Option<Duration>,
-    prev_time: f64,
+    prev_time: Instant,
 }
 
 impl UpdateRate {
@@ -10,7 +10,7 @@ impl UpdateRate {
         UpdateRate {
             // Default limit to 4 ms
             target_rate: Some(Duration::from_millis(4)),
-            prev_time: 0.0,
+            prev_time: Instant::now(),
         }
     }
 
@@ -20,20 +20,16 @@ impl UpdateRate {
     }
 
     pub fn update(&mut self) {
-        if let Some(rate) = self.target_rate {
-            let target_rate = rate.as_secs_f64();
-            let current_time = time::precise_time_s();
-            let delta = current_time - self.prev_time;
+        if let Some(target_rate) = self.target_rate {
+            let delta = self.prev_time.elapsed();
 
             if delta < target_rate {
                 let sleep_time = target_rate - delta;
-                if sleep_time > 0.0 {
-                    //println!("sleeping {} ms", sleep_time * 1000.0);
-                    std::thread::sleep(Duration::from_secs_f64(sleep_time));
-                }
+                //eprintln!("sleeping {} ms", sleep_time.as_secs_f64() * 1000.);
+                std::thread::sleep(sleep_time);
             }
 
-            self.prev_time = time::precise_time_s();
+            self.prev_time = Instant::now();
         }
     }
 }