From 19bf386de967dd63bcc7e8cc13e1f7c37f5404f0 Mon Sep 17 00:00:00 2001
From: Carter Anderson <mcanders1@gmail.com>
Date: Sat, 30 May 2020 21:32:47 -0700
Subject: [PATCH] track time since startup

---
 crates/bevy_core/src/time.rs | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/crates/bevy_core/src/time.rs b/crates/bevy_core/src/time.rs
index 698e3b3df8..ba0f9feff5 100644
--- a/crates/bevy_core/src/time.rs
+++ b/crates/bevy_core/src/time.rs
@@ -6,6 +6,8 @@ pub struct Time {
     pub instant: Option<Instant>,
     pub delta_seconds_f64: f64,
     pub delta_seconds: f32,
+    pub seconds_since_startup: f64,
+    pub startup: Instant,
 }
 
 impl Default for Time {
@@ -13,7 +15,9 @@ impl Default for Time {
         Time {
             delta: Duration::from_secs(0),
             instant: None,
+            startup: Instant::now(),
             delta_seconds_f64: 0.0,
+            seconds_since_startup: 0.0,
             delta_seconds: 0.0,
         }
     }
@@ -28,8 +32,15 @@ impl Time {
                 self.delta.as_secs() as f64 + (self.delta.subsec_nanos() as f64 / 1.0e9);
             self.delta_seconds = self.delta_seconds_f64 as f32;
         }
+
+        let duration_since_startup = now - self.startup;
+        self.seconds_since_startup = duration_since_startup.as_secs() as f64 + (duration_since_startup.subsec_nanos() as f64 / 1.0e9);
         self.instant = Some(now);
     }
+
+    pub fn time_since_startup(&self) -> Duration {
+        Instant::now() - self.startup
+    }
 }
 
 pub fn timer_system(mut time: ResMut<Time>) {