initial commit

1 files changed, 26 insertions, 0 deletions

diff --git a/src/engine/clock.js b/src/engine/clock.js
new file mode 100644
index 0000000..e817863
--- /dev/null
+++ b/src/engine/clock.js
@@ -0,0 +1,26 @@
+import { Engine } from "../engine.js"
+
+export { Engine } from "../engine.js"
+const fps = 60
+
+/* cap the game's fps */
+let msPrev = window.performance.now()
+const msPerFrame = 1000 / fps
+function tick() {
+    window.requestAnimationFrame(tick)
+    
+    const msNow = window.performance.now()
+    const msPassed = msNow - msPrev
+    
+    if (msPassed < msPerFrame) return
+    
+    const excessTime = msPassed % msPerFrame
+    msPrev = msNow - excessTime
+    
+    Engine.frame++
+    Engine.updateEngine()
+}
+
+export function startClock() {
+    tick()
+}