rotate_mesh.hpp

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#ifndef GENERATOR_ROTATEMESH_HPP
#define GENERATOR_ROTATEMESH_HPP
 
#include "axis.hpp"
#include "transform_mesh.hpp"
 
namespace generator
{
 
template<typename mesh_t>
class rotate_mesh_t
{
private:
    using impl_t = transform_mesh_t<mesh_t>;
    impl_t transform_mesh_;
 
public:
    rotate_mesh_t(mesh_t mesh, const gml::dquat& rotation)
        : transform_mesh_{std::move(mesh),
                          [rotation](mesh_vertex_t& value)
                          {
                              value.position = gml::transform(rotation, value.position);
                              value.normal = gml::transform(rotation, value.normal);
                          }}
    {
    }
 
    rotate_mesh_t(mesh_t mesh, double angle, const gml::dvec3& axis)
        : rotate_mesh_t{std::move(mesh), gml::qrotate(angle, axis)}
    {
    }
 
    rotate_mesh_t(mesh_t mesh, double angle, axis_t axis)
        : rotate_mesh_t{std::move(mesh),
                        gml::qrotate(angle,
                                     axis == axis_t::X
                                         ? gml::dvec3{1.0, 0.0, 0.0}
                                         : (axis == axis_t::Y ? gml::dvec3{0.0, 1.0, 0.0} : gml::dvec3{0.0, 0.0, 1.0}))}
    {
    }
 
    using triangles_t = typename impl_t::triangles_t;
 
    triangles_t triangles() const noexcept
    {
        return transform_mesh_.triangles();
    }
 
    using vertices_t = typename impl_t::vertices_t;
 
    vertices_t vertices() const noexcept
    {
        return transform_mesh_.vertices();
    }
};
 
template<typename mesh_t>
rotate_mesh_t<mesh_t> rotate_mesh(mesh_t mesh, const gml::dquat& rotation)
{
    return rotate_mesh_t<mesh_t>{std::move(mesh), rotation};
}
 
template<typename mesh_t>
rotate_mesh_t<mesh_t> rotate_mesh(mesh_t mesh, double angle, const gml::dvec3& axis)
{
    return rotate_mesh_t<mesh_t>{std::move(mesh), angle, axis};
}
 
template<typename mesh_t>
rotate_mesh_t<mesh_t> rotate_mesh(mesh_t mesh, double angle, axis_t axis)
{
    return rotate_mesh_t<mesh_t>{std::move(mesh), angle, axis};
}
} // namespace generator
 
#endif