flip_mesh.hpp

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#ifndef GENERATOR_FLIPMESH_HPP
#define GENERATOR_FLIPMESH_HPP
 
#include "transform_mesh.hpp"
#include "triangle.hpp"
 
namespace generator
{
 
template<typename mesh_t>
class flip_mesh_t
{
private:
    using impl_t = transform_mesh_t<mesh_t>;
    impl_t transform_mesh_;
 
public:
    class triangles_t
    {
    public:
        triangle_t generate() const
        {
            triangle_t triangle = triangles_.generate();
            std::swap(triangle.vertices[0], triangle.vertices[2]);
            return triangle;
        }
 
        bool done() const noexcept
        {
            return triangles_.done();
        }
 
        void next()
        {
            triangles_.next();
        }
 
    private:
        typename triangle_generator_type<transform_mesh_t<mesh_t>>::type triangles_;
 
        explicit triangles_t(const transform_mesh_t<mesh_t>& mesh) : triangles_{mesh.triangles()}
        {
        }
 
        friend class flip_mesh_t;
    };
 
    flip_mesh_t(mesh_t mesh)
        : transform_mesh_{std::move(mesh),
                          [](mesh_vertex_t& vertex)
                          {
                              vertex.normal *= -1.0;
                          }}
    {
    }
 
    triangles_t triangles() const noexcept
    {
        return triangles_t{this->transform_mesh_};
    }
 
    using vertices_t = typename impl_t::vertices_t;
 
    vertices_t vertices() const noexcept
    {
        return transform_mesh_.vertices();
    }
};
 
template<typename mesh_t>
flip_mesh_t<mesh_t> flip_mesh(mesh_t mesh)
{
    return flip_mesh_t<mesh_t>{std::move(mesh)};
}
} // namespace generator
 
#endif