Fix delta time calculation

backend/src/game-server.ts

@@ -143,9 +143,8 @@ export class GameServer extends CommandReceiver {
   private timeSinceLastPointUpdate = 0;
 
   private handlePhysics() {
-    const delta = this.deltaTimeCalculator.getNextDeltaTimeInSeconds();
+    const delta = this.deltaTimeCalculator.getNextDeltaTimeInSeconds({ setAsBase: true });
-    if (delta > settings.targetPhysicsDeltaTimeInSeconds) {
+    this.deltaTimes.push(delta);
-      this.deltaTimeCalculator.getNextDeltaTimeInSeconds(true);
 
     this.handleStats();
 
@@ -172,10 +171,12 @@ export class GameServer extends CommandReceiver {
     this.players.stepCommunication(delta);
     this.objects.resetRemoteCalls();
 
-      this.deltaTimes.push(this.deltaTimeCalculator.getNextDeltaTimeInSeconds());
+    const physicsDelta = this.deltaTimeCalculator.getNextDeltaTimeInSeconds();
-    }
 
-    setImmediate(this.handlePhysics.bind(this));
+    setTimeout(
+      this.handlePhysics.bind(this),
+      Math.max(0, settings.targetPhysicsDeltaTimeInSeconds - physicsDelta) * 1000,
+    );
   }
 
   private handleStats() {
@@ -184,9 +185,9 @@ export class GameServer extends CommandReceiver {
     if (this.deltaTimes.length > framesBetweenDeltaTimeCalculation) {
       this.deltaTimes.sort((a, b) => a - b);
       console.info(
-        `Median physics time: ${this.deltaTimes[
+        `Median physics time: ${(
-          Math.floor(framesBetweenDeltaTimeCalculation / 2)
+          this.deltaTimes[Math.floor(framesBetweenDeltaTimeCalculation / 2)] * 1000
-        ].toFixed(2)} ms`,
+        ).toFixed(2)} ms`,
       );
       console.info(
         'Tail times: ',

backend/src/helper/delta-time-calculator.ts

@@ -1,7 +1,9 @@
 export class DeltaTimeCalculator {
   private previousTime: [number, number] = process.hrtime();
 
-  public getNextDeltaTimeInSeconds(setAsBase = false): number {
+  public getNextDeltaTimeInSeconds(
+    { setAsBase = false }: { setAsBase: boolean } = { setAsBase: false },
+  ): number {
     const [seconds, nanoSeconds] = process.hrtime(this.previousTime);
     if (setAsBase) {
       this.previousTime = process.hrtime();