1 files changed, 42 insertions, 0 deletions
diff --git a/stockton-contrib/src/delta_time.rs b/stockton-contrib/src/delta_time.rs
new file mode 100644
index 0000000..4684e79
--- /dev/null
+++ b/stockton-contrib/src/delta_time.rs
@@ -0,0 +1,42 @@
+/*
+ * Copyright (C) Oscar Shrimpton 2020
+ *
+ * This program is free software: you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the Free
+ * Software Foundation, either version 3 of the License, or (at your option)
+ * any later version.
+ *
+ * This program is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+use std::time::Instant;
+
+#[derive(Debug, Clone)]
+pub struct Timing {
+    pub delta_time: f32,
+
+    pub(crate) last_frame_start: Instant,
+}
+
+impl Default for Timing {
+    fn default() -> Self {
+        Timing {
+            delta_time: 0.0,
+
+            last_frame_start: Instant::now(),
+        }
+    }
+}
+
+#[system]
+pub fn update_deltatime(#[resource] timing: &mut Timing) {
+    let now = Instant::now();
+    timing.delta_time = now.duration_since(timing.last_frame_start).as_secs_f32();
+    timing.last_frame_start = now;
+}