From 3e15fbe9d6c141e580e85bfe97bd11cb253c4d0d Mon Sep 17 00:00:00 2001
From: 06wj <06wj@163.com>
Date: Tue, 30 Jun 2020 13:52:44 +0800
Subject: [PATCH] fix: ResourceManager.destroyUnsuedResource parameter become
 optional

---
 src/renderer/WebGLResourceManager.js | 25 ++++++++++++++-----------
 1 file changed, 14 insertions(+), 11 deletions(-)

diff --git a/src/renderer/WebGLResourceManager.js b/src/renderer/WebGLResourceManager.js
index 0aabfb30..6255f3fa 100644
--- a/src/renderer/WebGLResourceManager.js
+++ b/src/renderer/WebGLResourceManager.js
@@ -78,32 +78,35 @@ const WebGLResourceManager = Class.create(/** @lends WebGLResourceManager.protot
     },
 
     /**
-     * 获取用到的资源
-     * @param  {Stage} stage
+     * 获取 rootNode 用到的资源
+     * @param  {Node} [rootNode] 根节点，不传返回空数组
      * @return {Object[]}
      */
-    getUsedResources(stage) {
+    getUsedResources(rootNode) {
         const resources = [];
-        stage.traverse((node) => {
-            if (node.isMesh && !node.isDestroyed) {
-                this.getMeshResources(node, resources);
-            }
-        });
+        if (rootNode) {
+            rootNode.traverse((node) => {
+                if (node.isMesh && !node.isDestroyed) {
+                    this.getMeshResources(node, resources);
+                }
+            });
+        }
 
         return resources;
     },
 
     /**
-     * 销毁没被使用的资源
+     * 销毁没被 rootNode 使用的资源，通常传 stage。
+     * @param {Node} [rootNode] 根节点，不传代表所有资源都没被使用过。
      * @return {WebGLResourceManager} this
      */
-    destroyUnsuedResource(stage) {
+    destroyUnsuedResource(rootNode) {
         const needDestroyResources = this._needDestroyResources;
         if (needDestroyResources.length === 0) {
             return this;
         }
 
-        const usedResources = this.getUsedResources(stage);
+        const usedResources = this.getUsedResources(rootNode);
 
         needDestroyResources.forEach((resource) => {
             if (usedResources.indexOf(resource) < 0) {