text: /*
   * Copyright (C) 2017 The Android Open Source Project
   *
   * Licensed under the Apache License, Version 2.0 (the "License");
   * you may not use this file except in compliance with the License.
   * You may obtain a copy of the License at
   *
   *      http://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS,
   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   * See the License for the specific language governing permissions and
   * limitations under the License.
   */
  
  #ifndef TNT_FILAMENT_CAMERAMANAGER_H
  #define TNT_FILAMENT_CAMERAMANAGER_H
  
  #include "upcast.h"
  
  #include <filament/FilamentAPI.h>
  
  #include <utils/compiler.h>
  #include <utils/SingleInstanceComponentManager.h>
  #include <utils/Entity.h>
  
  namespace filament {
  
  class CameraManager : public FilamentAPI {
  public:
      using Instance = utils::EntityInstance<CameraManager>;
  };
  
  class FEngine;
  class FCamera;
  
  class UTILS_PRIVATE FCameraManager : public CameraManager {
  public:
      using Instance = CameraManager::Instance;
  
      explicit FCameraManager(FEngine& engine) noexcept;
  
      ~FCameraManager() noexcept;
  
      // free-up all resources
      void terminate() noexcept;
  
      void gc(utils::EntityManager& em) noexcept;
  
      /*
      * Component Manager APIs
      */
  
      bool hasComponent(utils::Entity e) const noexcept {
          return mManager.hasComponent(e);
      }
  
      Instance getInstance(utils::Entity e) const noexcept {
          return Instance(mManager.getInstance(e));
      }
  
      FCamera* getCamera(Instance i) noexcept {
          return mManager.elementAt<CAMERA>(i);
      }
  
      FCamera* create(utils::Entity entity);
  
      void destroy(utils::Entity e) noexcept;
  
  private:
  
      enum {
          CAMERA
      };
  
      using Base = utils::SingleInstanceComponentManager<FCamera *>;
  
      struct CameraManagerImpl : public Base {
          using Base::gc;
          using Base::swap;
          using Base::hasComponent;
      } mManager;
  
      FEngine& mEngine;
  };
  
  } // namespace filament
  
  #endif // TNT_FILAMENT_CAMERAMANAGER_H
  