add RenderCommandPool head file

cocos/2d/renderer/RenderCommandPool.h

@@ -0,0 +1,75 @@
+//
+//  RenderCommandPool.h
+//  cocos2d_libs
+//
+//  Created by Huabing on 11/28/13.
+//
+//
+
+#ifndef __CC_RENDERCOMMANDPOOL_H__
+#define __CC_RENDERCOMMANDPOOL_H__
+
+#include <set>
+#include <list>
+#include "CCPlatformMacros.h"
+NS_CC_BEGIN
+
+template <class T>
+class RenderCommandPool
+{
+public:
+    RenderCommandPool()
+    {
+    }
+    ~RenderCommandPool()
+    {
+//        if( 0 != _usedPool.size())
+//        {
+//            CCLOG("All RenderCommand should not be used when Pool is released!");
+//        }
+        for (typename std::list<T*>::iterator iter = _freePool.begin(); iter != _freePool.end(); ++iter)
+        {
+            delete *iter;
+            *iter = nullptr;
+        }
+        _freePool.clear();
+    }
+    
+public:
+    T* generateCommand()
+    {
+        T* result = nullptr;
+        if(0 == _freePool.size())
+        {
+            result = new T();
+        }
+        else
+        {
+            result = _freePool.front();
+            _freePool.pop_front();
+        }
+        //_usedPool.insert(result);
+        return result;
+    }
+    
+    void pushBackCommand(T* ptr)
+    {
+//        if(_usedPool.find(ptr) == _usedPool.end())
+//        {
+//            CCLOG("push Back Wrong command!");
+//            return;
+//        }
+        
+        _freePool.push_back(ptr);
+        //_usedPool.erase(ptr);
+        
+    }
+    
+private:
+    std::list<T*> _freePool;
+    //std::set<T*> _usedPool;
+};
+
+NS_CC_END
+
+#endif