text: /*
   * Copyright (C) 2012-2016 Open Source Robotics Foundation
   *
   * 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 _MERGESCHEMEHANDLER_HH_
  #define _MERGESCHEMEHANDLER_HH_
  
  #include <OgreMaterialManager.h>
  #include <string>
  #include <vector>
  
  #include "gazebo/rendering/deferred_shading/MergeMaterialGenerator.hh"
  #include "gazebo/util/system.hh"
  
  namespace gazebo
  {
    namespace rendering
    {
      /// Class for handling materials who did not specify techniques for the
      /// merging step of deferred/inferred lighting.
      class GZ_RENDERING_VISIBLE MergeSchemeHandler :
        public Ogre::MaterialManager::Listener
      {
        public: MergeSchemeHandler(bool _useDSF) : useDSF(_useDSF)
        {
          if (this->useDSF)
          {
            this->materialGenerator =
              new MergeMaterialGenerator("InferredLighting", true);
            this->techName = "InferredLighting";
          }
          else
          {
            this->materialGenerator =
              new MergeMaterialGenerator("DeferredLighting", false);
            this->techName = "DeferredLighting";
          }
        }
  
        /// @copydoc MaterialManager::Listener::handleSchemeNotFound
        public: virtual Ogre::Technique *handleSchemeNotFound(
                    uint16_t _schemeIndex,
                    const Ogre::String &_schemeName,
                    Ogre::Material *_originalMaterial,
                    uint16_t _lodIndex,
                    const Ogre::Renderable* rend);
  
        /// The string that will be checked in textures to determine whether
        /// they are normal maps
        protected: static const std::string normal_map_pattern;
        protected: bool useDSF;
        protected: Ogre::String techName;
        protected: MergeMaterialGenerator *materialGenerator;
  
        /// A structure for containing the properties of a material
        protected: struct PassProperties
        {
          PassProperties() : isDeferred(true), normalMap(0), isSkinned(false),
                             hasDiffuseColor(true) {}
  
          bool isDeferred;
          Ogre::TextureUnitState *normalMap;
          bool isSkinned;
          bool hasDiffuseColor;
          Ogre::vector<Ogre::TextureUnitState*>::type regularTextures;
        };
  
        /// Inspect a technique and return its relevant properties
        protected: PassProperties InspectPass(Ogre::Pass *_pass,
          uint16_t _lodIndex, const Ogre::Renderable *_rend);
  
        /// Get the permutation of material flags that fit a certain
        /// property sheet
        protected: MaterialGenerator::Perm GetPermutation(
                       const PassProperties &_props);
  
        /// Fill a pass with the specific data from the pass it is based on
        protected: void FillPass(Ogre::Pass *_gBufferPass,
                       Ogre::Pass *_originalPass, const PassProperties &_props);
  
        /// Check if a texture is a normal map, and fill property
        /// sheet accordingly
        protected: bool CheckNormalMap(Ogre::TextureUnitState *_tus,
                                       PassProperties &_props);
      };
    }
  }
  #endif
  