From 29c4f83fd8b738f05492aa7bd3011d3ed1d22f27 Mon Sep 17 00:00:00 2001
From: G17hao <670788361@qq.com>
Date: Tue, 20 Jan 2015 19:28:30 +0800
Subject: [PATCH] Update CCGroupCommand.cpp

add a vector container for save unused id.
traversal unordered_map is too slow, use vector to replace it
---
 cocos/renderer/CCGroupCommand.cpp | 12 ++++++------
 1 file changed, 6 insertions(+), 6 deletions(-)

diff --git a/cocos/renderer/CCGroupCommand.cpp b/cocos/renderer/CCGroupCommand.cpp
index 576dab111e..24874f4351 100644
--- a/cocos/renderer/CCGroupCommand.cpp
+++ b/cocos/renderer/CCGroupCommand.cpp
@@ -49,13 +49,12 @@ bool GroupCommandManager::init()
 int GroupCommandManager::getGroupID()
 {
     //Reuse old id
-    for(auto it = _groupMapping.begin(); it != _groupMapping.end(); ++it)
+    if (!_unusedIDs.empty())
     {
-        if(!it->second)
-        {
-            _groupMapping[it->first] = true;
-            return it->first;
-        }
+        int groupID = *_unusedIDs.rbegin();
+        _unusedIDs.pop_back();
+        _groupMapping[groupID] = true;
+        return groupID;
     }
 
     //Create new ID
@@ -69,6 +68,7 @@ int GroupCommandManager::getGroupID()
 void GroupCommandManager::releaseGroupID(int groupID)
 {
     _groupMapping[groupID] = false;
+    _unusedIDs.push_back(groupID);
 }
 
 GroupCommand::GroupCommand()