Fully support WASM (in some contexts)

1 files changed, 45 insertions, 0 deletions

diff --git a/src/time.rs b/src/time.rs
new file mode 100644
index 0000000..5978b57
--- /dev/null
+++ b/src/time.rs
@@ -0,0 +1,45 @@
+use std::time::{Duration, Instant, SystemTime};
+
+pub struct TimeContext {
+	start_time: Instant,
+	last_frame: Instant,
+	current_frame: Instant,
+	system_time: SystemTime,
+}
+
+impl TimeContext {
+	pub fn new() -> Self {
+		let now = Instant::now();
+		Self {
+			start_time: now,
+			last_frame: now,
+			current_frame: now,
+			system_time: SystemTime::now(),
+		}
+	}
+
+	pub fn next_frame(&mut self) {
+		puffin::profile_scope!("update time");
+		self.last_frame = self.current_frame;
+		self.current_frame = Instant::now();
+		self.system_time = SystemTime::now()
+	}
+
+	pub fn delta_time(&self) -> Duration {
+		self.current_frame - self.last_frame
+	}
+
+	pub fn monotonic_now(&self) -> Duration {
+		self.current_frame - self.start_time
+	}
+
+	pub fn system_now(&self) -> SystemTime {
+		self.system_time
+	}
+}
+
+impl Default for TimeContext {
+	fn default() -> Self {
+		Self::new()
+	}
+}