init

engine/Scene.ts

@@ -0,0 +1,62 @@
+export type SceneData = {
+	id: string;
+	width: number;
+	height: number;
+	entities: string[];
+};
+
+export type Scene = {
+	data: SceneData;
+	process: Process;
+};
+
+export type Process = (ctx: CanvasRenderingContext2D, delta: number) => void;
+
+export type SceneChangeCallback = (from: Scene, to: Scene) => void;
+
+let sceneChangeCallback: SceneChangeCallback = (): void => {};
+
+const sceneDataMap = new Map<string, SceneData>();
+const sceneProcessMap = new Map<string, Process>();
+
+export const currentScene: Scene = {
+	data: {
+		id: "",
+		width: 0,
+		height: 0,
+		entities: [],
+	},
+	process: () => {},
+};
+
+export function useScene(data: SceneData): {
+	process: (fn: Process) => void;
+} {
+	sceneDataMap.set(data.id, data);
+
+	return {
+		process(fn: Process): void {
+			sceneProcessMap.set(data.id, fn);
+		},
+	};
+}
+
+export function setSceneChangeCallback(callback: SceneChangeCallback) {
+	sceneChangeCallback = callback;
+}
+
+export function changeScene(scene: Scene): void {
+	sceneChangeCallback(currentScene, scene);
+	currentScene.data = scene.data;
+	currentScene.process = scene.process;
+}
+
+export async function loadScene(name: string): Promise<void> {
+	await import(`#/scenes/${name}/index.ts`);
+
+	const data = sceneDataMap.get(name)!;
+	currentScene.data = data;
+
+	const process = sceneProcessMap.get(name)!;
+	currentScene.process = process;
+}