From 3af4b8ac99ad19c410849b57e77ac0b8b05e767b Mon Sep 17 00:00:00 2001
From: cha0s <git@cha0s.io>
Date: Sat, 3 Dec 2022 14:40:03 -0600
Subject: [PATCH] feat: clone

---
 packages/ecs/src/ecs.js | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/packages/ecs/src/ecs.js b/packages/ecs/src/ecs.js
index 1e06cda..a7ab205 100644
--- a/packages/ecs/src/ecs.js
+++ b/packages/ecs/src/ecs.js
@@ -9,6 +9,8 @@ export default class Ecs {
 
   Bundles = {};
 
+  $$ComponentLikesAndOrBundleLikes;
+
   Components = {};
 
   dirty = new Set();
@@ -20,6 +22,7 @@ export default class Ecs {
   $$systems = [];
 
   constructor(ComponentLikesAndOrBundleLikes) {
+    this.$$ComponentLikesAndOrBundleLikes = ComponentLikesAndOrBundleLikes;
     const Bundles = [];
     for (const i in ComponentLikesAndOrBundleLikes) {
       const MaybeBundle = Bundle.maybeNormalize(ComponentLikesAndOrBundleLikes[i]);
@@ -81,6 +84,14 @@ export default class Ecs {
     this.$$systems.push(wrappedSystem);
   }
 
+  clone() {
+    const view = new DataView(new ArrayBuffer(this.sizeOf(this.entities, true)));
+    this.encode(this.entities, view);
+    const ecs = new this.constructor(this.$$ComponentLikesAndOrBundleLikes);
+    ecs.decode(view);
+    return ecs;
+  }
+
   create(components = {}) {
     const [entity] = this.createMany([components]);
     return entity;