src: Clean up.

Author: linbingquan

src/core/Clock.js

@@ -1,3 +1,5 @@
+import { now } from '../utils.js';
+
 /**
  * Class for keeping track of time.
  */
@@ -125,10 +127,4 @@ class Clock {
 
 }
 
-function now() {
-
-	return performance.now();
-
-}
-
 export { Clock };

src/nodes/core/NodeFrame.js

@@ -1,4 +1,5 @@
 import { NodeUpdateType } from './constants.js';
+import { now } from '../../utils.js';
 
 /**
  * Management class for updating nodes. The module tracks metrics like
@@ -291,11 +292,11 @@ class NodeFrame {
 
 		this.frameId ++;
 
-		if ( this.lastTime === undefined ) this.lastTime = performance.now();
+		if ( this.lastTime === undefined ) this.lastTime = now();
 
-		this.deltaTime = ( performance.now() - this.lastTime ) / 1000;
+		this.deltaTime = ( now() - this.lastTime ) / 1000;
 
-		this.lastTime = performance.now();
+		this.lastTime = now();
 
 		this.time += this.deltaTime;
 

src/utils.js

@@ -149,4 +149,10 @@ function toReversedProjectionMatrix( projectionMatrix ) {
 
 }
 
-export { arrayMin, arrayMax, arrayNeedsUint32, getTypedArray, createElementNS, createCanvasElement, warnOnce, probeAsync, toNormalizedProjectionMatrix, toReversedProjectionMatrix };
+function now() {
+
+	return performance.now();
+
+}
+
+export { arrayMin, arrayMax, arrayNeedsUint32, getTypedArray, createElementNS, createCanvasElement, warnOnce, probeAsync, toNormalizedProjectionMatrix, toReversedProjectionMatrix, now };