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/*  Visualization Library                                                             */
/*  http://visualizationlibrary.org                                                   */
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/*  Copyright (c) 2005-2020, Michele Bosi                                             */
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#ifndef DoubleVertexRemover_INCLUDE_ONCE
#define DoubleVertexRemover_INCLUDE_ONCE

#include <vlGraphics/Geometry.hpp>
#include <vector>

namespace vl
{
  //-----------------------------------------------------------------------------
  // VertexMapper
  //-----------------------------------------------------------------------------
  //! Generates a set of new vertices from the old one.
  class VLGRAPHICS_EXPORT VertexMapper: public Object
  {
    VL_INSTRUMENT_CLASS(vl::VertexMapper, Object)

  public:
    //! Regenerates a new Array based on the given mapping.
    //! \param data The array to be regenerated
    //! \param map_new_to_old Specifies the mapping from the old vetices to the new one. The \p i-th vertex of the new vertex array will use the \p map_new_to_old[i]-th vertex of the old array,
    //! that is, \p map_new_to_old[i] specifies the \a old vertex to be used to generate the \a new \p i-th vertex.
    ref<ArrayAbstract> regenerate(ArrayAbstract* data, const std::vector<u32>& map_new_to_old) const;
  private:
    template<class T>
    ref<ArrayAbstract> regenerateT(ArrayAbstract* data, const std::vector<u32>& map_new_to_old) const;
  };
  //-----------------------------------------------------------------------------
  // DoubleVertexRemover
  //-----------------------------------------------------------------------------
  //! Removes from a Geometry the vertices with the same attributes.
  //! As a result also all the DrawArrays prensent in the Geometry are substituted with DrawElements.
  class VLGRAPHICS_EXPORT DoubleVertexRemover: public VertexMapper
  {
    VL_INSTRUMENT_CLASS(vl::DoubleVertexRemover, VertexMapper)

  public:
    DoubleVertexRemover() {}
    void removeDoubles(Geometry* geom);
    const std::vector<u32>& mapNewToOld() const { return mMapNewToOld; }
    const std::vector<u32>& mapOldToNew() const { return mMapOldToNew; }

  protected:
    std::vector<u32> mMapNewToOld;
    std::vector<u32> mMapOldToNew;
  };
}

#endif