text: /****************************************************************************
  Copyright (c) 2011      Ricardo Quesada
  Copyright (c) 2010-2012 cocos2d-x.org
  Copyright (c) 2011      Zynga Inc.
  Copyright (c) 2013-2016 Chukong Technologies Inc.
  
  http://www.cocos2d-x.org
  
  Permission is hereby granted, free of charge, to any person obtaining a copy
  of this software and associated documentation files (the "Software"), to deal
  in the Software without restriction, including without limitation the rights
  to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  copies of the Software, and to permit persons to whom the Software is
  furnished to do so, subject to the following conditions:
  
  The above copyright notice and this permission notice shall be included in
  all copies or substantial portions of the Software.
  
  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
  AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
  THE SOFTWARE.
  ****************************************************************************/
  
  #ifndef __CCGLPROGRAMCACHE_H__
  #define __CCGLPROGRAMCACHE_H__
  
  #include <string>
  #include <unordered_map>
  
  #include "base/CCRef.h"
  
  /**
   * @addtogroup renderer
   * @{
   */
  
  namespace cocos2d {
  
  class GLProgram;
  
  /** GLProgramCache
   Singleton that stores manages GLProgram objects (shaders)
   @since v2.0
   */
  class CC_DLL GLProgramCache : public Ref
  {
  public:
      /**
      Constructor.
       * @js ctor
       */
      GLProgramCache();
      /**
      Destructor.
       * @js NA
       * @lua NA
       */
      ~GLProgramCache();
  
      /** returns the shared instance */
      static GLProgramCache* getInstance();
  
      /** purges the cache. It releases the retained instance. */
      static void destroyInstance();
  
      /** loads the default shaders */
      void loadDefaultGLPrograms();
  
      /** reload the default shaders */
      void reloadDefaultGLPrograms();
  
      /** returns a GL program for a given key 
       */
      GLProgram * getGLProgram(const std::string &key);
  
      /** adds a GLProgram to the cache for a given name */
      void addGLProgram(GLProgram* program, const std::string &key);
      
      /** reload default programs these are relative to light */
      void reloadDefaultGLProgramsRelativeToLights();
  
  private:
      /**
      @{
          Init and load predefined shaders.
      */
      bool init();
      void loadDefaultGLProgram(GLProgram *program, int type);
      /**
      @}
      */
  
      /**Get macro define for lights in current openGL driver.*/
      std::string getShaderMacrosForLight() const;
  
      /**Predefined shaders.*/
      std::unordered_map<std::string, GLProgram*> _programs;
  };
  
  } // namespace cocos2d
  // end of shaders group
  /// @}
  
  #endif /* __CCGLPROGRAMCACHE_H__ */
  