Well it works again

engine/Scene.ts

@@ -1,5 +1,4 @@
 import {
-	type Entity,
 	entityMap,
 	entityProcessMap,
 	type Process as ProcessEntity,

engine/Sprite.ts

@@ -1,4 +1,6 @@
-export type SpritesSheet = {
+import { loadImage } from "./lib/loadImage";
+
+export type SpriteSheet = {
 	image: HTMLImageElement;
 	xFrames: number;
 	yFrames: number;
@@ -7,18 +9,23 @@ export type SpritesSheet = {
 };
 
 export type SpriteAnimation = {
-	sheet: SpritesSheet;
+	src: string;
 	xIndex: number;
 	yIndex: number;
 	frameTime: number;
 	frameDelta: number;
 };
 
-export function createSpritesSheet(
+// It's not possible to crate a structured clone of a HTMLImageElement and it would be a
+// waste of memory anyways since we use the HTMLImageElement only as reference for draw calls.
+// Therefore the SpriteSheet will stored by it's image source.
+export const spriteSheetMap = new Map<string, SpriteSheet>();
+
+export function createSpriteSheet(
 	image: HTMLImageElement,
 	xFrames: number,
 	yFrames: number,
-): SpritesSheet {
+): SpriteSheet {
 	return {
 		image,
 		xFrames,
@@ -28,13 +35,26 @@ export function createSpritesSheet(
 	};
 }
 
+export async function useSpriteSheetSrc(
+	src: string,
+	xFrames: number,
+	yFrames: number,
+): Promise<string> {
+	spriteSheetMap.set(
+		src,
+		createSpriteSheet(await loadImage(src), xFrames, yFrames),
+	);
+
+	return src;
+}
+
 export function createSpriteAnimation(
-	sheet: SpritesSheet,
+	src: string,
 	frameTime: number,
 	yIndex: number,
 ): SpriteAnimation {
 	return {
-		sheet,
+		src,
 		xIndex: 0,
 		yIndex,
 		frameTime,
@@ -44,7 +64,7 @@ export function createSpriteAnimation(
 
 export function drawSprite(
 	ctx: CanvasRenderingContext2D,
-	sheet: SpritesSheet,
+	sheet: SpriteSheet,
 	xIndex: number,
 	yIndex: number,
 	x: number,
@@ -72,12 +92,14 @@ export function playAnimation(
 	y: number,
 	delta: number,
 ): void {
+	const sheet = spriteSheetMap.get(animation.src)!;
+
 	if ((animation.frameDelta += delta) > animation.frameTime) {
 		animation.frameDelta = 0;
-		if ((animation.xIndex += 1) >= animation.sheet.xFrames) {
+		if ((animation.xIndex += 1) >= sheet.xFrames) {
 			animation.xIndex = 0;
 		}
 	}
 
-	drawSprite(ctx, animation.sheet, animation.xIndex, animation.yIndex, x, y);
+	drawSprite(ctx, sheet, animation.xIndex, animation.yIndex, x, y);
 }

game/entities/hero/entity.ts

@@ -2,13 +2,12 @@ import { type Circle, createCircle } from "#/engine/Circle.ts";
 import { moveAndCollide } from "#/engine/Collision.ts";
 import { defineEntity } from "#/engine/Entity.ts";
 import { keyboardInput } from "#/engine/Keyboard.ts";
-import { loadImage } from "#/engine/lib/loadImage";
 import { pointer } from "#/engine/Pointer.ts";
 import {
 	createSpriteAnimation,
-	createSpritesSheet,
 	type SpriteAnimation,
-} from "#/engine/sprites.ts";
+	useSpriteSheetSrc,
+} from "#/engine/Sprite.ts";
 import { createVector, type Vector } from "#/engine/Vector.ts";
 import charIdle from "#/game/assets/char-idle.png";
 
@@ -20,7 +19,7 @@ export type Hero = {
 };
 
 const speed = 0.05;
-const idleSheet = createSpritesSheet(await loadImage(charIdle), 2, 4);
+const idleSheet = await useSpriteSheetSrc(charIdle, 2, 4);
 
 const state: Hero = {
 	position: createVector(),

game/entities/portal/entity.ts

@@ -1,9 +1,8 @@
 import { defineEntity } from "#/engine/Entity.ts";
-import { loadImage } from "#/engine/lib/loadImage.ts";
-import { createSpriteAnimation, createSpritesSheet } from "#/engine/sprites.ts";
+import { createSpriteAnimation, useSpriteSheetSrc } from "#/engine/Sprite.ts";
 import portal from "#/game/assets/portal.png";
 
-const portalSheet = createSpritesSheet(await loadImage(portal), 3, 1);
+const portalSheet = await useSpriteSheetSrc(portal, 3, 1);
 
 defineEntity("portal", {
 	animation: createSpriteAnimation(portalSheet, 400, 0),

game/entities/testEntity/entity.ts

@@ -1,18 +1,17 @@
 import { defineEntity } from "#/engine/Entity.ts";
-import { loadImage } from "#/engine/lib/loadImage.ts";
 import {
 	createSpriteAnimation,
-	createSpritesSheet,
 	type SpriteAnimation,
-} from "#/engine/sprites.ts";
+	useSpriteSheetSrc,
+} from "#/engine/Sprite.ts";
 import { createVector, type Vector } from "#/engine/Vector.ts";
 import { viewport } from "#/engine/Viewport.ts";
 import charIdle from "#/game/assets/char-idle.png";
 import charWalk from "#/game/assets/char-walk.png";
 
 const sprites = {
-	idle: createSpritesSheet(await loadImage(charIdle), 2, 4),
-	walk: createSpritesSheet(await loadImage(charWalk), 4, 4),
+	idle: await useSpriteSheetSrc(charIdle, 2, 4),
+	walk: await useSpriteSheetSrc(charWalk, 4, 4),
 };
 
 const animations = {

game/scenes/testScene/scene.ts

@@ -1,6 +1,7 @@
 import { strokeCircle } from "#/engine/Circle.ts";
 import { pointer } from "#/engine/Pointer.ts";
 import { defineScene } from "#/engine/Scene.ts";
+import { spriteSheetMap } from "#/engine/Sprite.ts";
 import type { Hero } from "#/game/entities/hero/entity.ts";
 import data from "./data.json";
 
@@ -11,9 +12,10 @@ linkScenes(["fooScene"] as const);
 preProcess((entityInstanceMap) => {
 	const entry = entityInstanceMap.get("hero")!;
 	const instance = entry.instances[0] as Hero;
+	const sheet = spriteSheetMap.get(instance.animation.src)!;
 
-	instance.position.x = data.width - instance.animation.sheet.frameHeight;
-	instance.position.y = data.height - instance.animation.sheet.frameWidth;
+	instance.position.x = data.width - sheet.frameHeight;
+	instance.position.y = data.height - sheet.frameWidth;
 });
 
 process((ctx, _delta) => {