text: ////////////////////////////////////////////////////////////////////////////////
  //
  // MIT License
  // 
  // Copyright (c) 2018-2019 Nuraga Wiswakarma
  // 
  // 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.
  //
  ////////////////////////////////////////////////////////////////////////////////
  // 
  
  #include "EarcutTypes.h"
  #include "mapbox/earcut.hpp"
  
  namespace mapbox {
  namespace util {
  
  template <>
  struct nth<0, FVector2D> {
      inline static auto get(const FVector2D &t) {
          return t.X;
      };
  };
  
  template <>
  struct nth<1, FVector2D> {
      inline static auto get(const FVector2D &t) {
          return t.Y;
      };
  };
  
  } // namespace util
  } // namespace mapbox
  
  void FECUtils::Earcut(const FECPolygon& Polygon, TArray<int32>& OutIndices, bool bInversed)
  {
      mapbox::detail::Earcut<int32> ECImpl;
      ECImpl(Polygon);
  
      const std::vector<int32>& ECIndices(ECImpl.indices);
      const int32 IndexCount = ECIndices.size();
      const int32 TriCount = IndexCount / 3;
  
      // Copy result
  
      OutIndices.SetNumUninitialized(IndexCount);
  
      if (bInversed)
      {
          FMemory::Memcpy(OutIndices.GetData(), ECIndices.data(), ECIndices.size() * sizeof(int32));
      }
      else
      {
          for (int32 ti=0; ti<TriCount; ++ti)
          {
              const int32 i = ti*3;
              OutIndices[i  ] = ECIndices[i+2];
              OutIndices[i+1] = ECIndices[i+1];
              OutIndices[i+2] = ECIndices[i  ];
          }
      }
  }
  