added a shitty ecs that I'm confident is way worse than just looping … (#4)

* added a shitty ecs that I'm confident is way worse than just looping objects lol

* mader a rendering system based on ecs

core/renderer/engine.ts

@@ -0,0 +1,31 @@
+import { Scene } from "./scene";
+
+class Engine {
+  canvas: HTMLCanvasElement;
+  ctx: WebGL2RenderingContext;
+  scenes = [] as Scene[];
+
+  constructor(canvas: string | HTMLCanvasElement) {
+    /** get canvas by id */
+    if (typeof canvas === "string") {
+      canvas = document.getElementById(canvas)! as HTMLCanvasElement;
+    }
+
+    if (!canvas) {
+      throw new Error("canvas not found");
+    }
+    this.canvas = canvas;
+    this.ctx = canvas.getContext("webgl2")!;
+    if (!this.ctx) {
+      throw new Error("can't get webgl2 context");
+    }
+  }
+
+  createScene() {
+    const scene = new Scene(this.canvas, this.ctx);
+    this.scenes.push(scene);
+    return scene;
+  }
+}
+
+export { Engine };