1 files changed, 6 insertions, 4 deletions
diff --git a/src/controller/gamecontext.ts b/src/controller/gamecontext.ts
index d6d02d1..9c25c6b 100644
--- a/src/controller/gamecontext.ts
+++ b/src/controller/gamecontext.ts
@@ -41,7 +41,8 @@ export class GameContext implements CollidableGroup {
 		return [await loadMap(renderer, map), mkCollision(map.collision)];
 	}
 
-	private time: number|null = null;
+	private readonly initTime: number = performance.now();
+	private time = 0;
 
 	private readonly tick = 10; // ms per tick
 	private readonly maxSpeed = 0.04; // movement per tick
@@ -93,7 +94,7 @@ export class GameContext implements CollidableGroup {
 	}
 
 	private updateTime(time: number): number {
-		const diff = this.time !== null ? time - this.time : 0;
+		const diff = Math.round(time / this.tick) - Math.round(this.time / this.tick);
 		this.time = time;
 
 		return diff;
@@ -157,8 +158,9 @@ export class GameContext implements CollidableGroup {
 			this.updateStep();
 	}
 
-	private render = (time: number) => {
-		this.update(Math.round(time / this.tick));
+	private render = (curTime: number) => {
+		const time = curTime - this.initTime;
+		this.update(time);
 
 		this.renderer.setCenter(this.player.pos);
 		this.renderer.clear();