[oden] Time, path searching, game directory

src/script/time.rs

@@ -0,0 +1,65 @@
+use oden_js::{module::native::NativeModuleBuilder, ContextRef};
+use std::cell::RefCell;
+use std::sync::Arc;
+use std::time::{Duration, Instant};
+
+struct TimeImpl {
+    start: Instant,
+    last_frame_time: Instant,
+    frame_time: Instant,
+}
+
+impl TimeImpl {
+    fn new() -> Self {
+        let now = Instant::now();
+        TimeImpl {
+            start: now,
+            frame_time: now,
+            last_frame_time: now - Duration::from_millis(15),
+        }
+    }
+
+    fn since_last_frame(&self) -> f64 {
+        (self.frame_time - self.last_frame_time).as_secs_f64()
+    }
+
+    fn since_start(&self) -> f64 {
+        (self.frame_time - self.start).as_secs_f64()
+    }
+
+    fn set_frame_time(&mut self, now: Instant) {
+        self.last_frame_time = self.frame_time;
+        self.frame_time = now;
+    }
+}
+
+pub struct TimeAPI {
+    time: Arc<RefCell<TimeImpl>>,
+}
+
+impl TimeAPI {
+    pub fn define(ctx: &ContextRef) -> oden_js::Result<Self> {
+        let time = Arc::new(RefCell::new(TimeImpl::new()));
+        let mut builder = NativeModuleBuilder::new(ctx);
+        {
+            let time = time.clone();
+            builder.export(
+                "since_last_frame",
+                ctx.new_fn(move |_ctx: &ContextRef| time.borrow().since_last_frame())?,
+            )?;
+        }
+        {
+            let time = time.clone();
+            builder.export(
+                "since_start",
+                ctx.new_fn(move |_ctx: &ContextRef| time.borrow().since_start())?,
+            )?;
+        }
+        builder.build("time-core")?;
+        Ok(TimeAPI { time })
+    }
+
+    pub fn set_frame_time(&mut self, now: Instant) {
+        self.time.borrow_mut().set_frame_time(now);
+    }
+}