twisted_torus.hpp

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#ifndef EAGINE_SHAPES_TWISTED_TORUS_HPP
#define EAGINE_SHAPES_TWISTED_TORUS_HPP
 
#include "../config/basic.hpp"
#include "../valid_if/ge0_lt1.hpp"
#include "../valid_if/greater_than.hpp"
#include "gen_base.hpp"
#include <cassert>
 
namespace eagine {
namespace shapes {
//------------------------------------------------------------------------------
class unit_twisted_torus_gen : public centered_unit_shape_generator_base {
public:
    unit_twisted_torus_gen(
      vertex_attrib_bits attr_bits,
      int twist,
      valid_if_greater_than<int, 2> rings,
      valid_if_greater_than<int, 3> sections,
      valid_if_ge0_lt1<float> radius_ratio) noexcept;
 
    auto vertex_count() -> span_size_t override;
 
    void positions(span<float> dest) noexcept;
 
    void normals(span<float> dest) noexcept;
 
    void wrap_coords(span<float> dest) noexcept;
 
    void attrib_values(vertex_attrib_variant, span<float>) override;
 
    auto operation_count(drawing_variant) -> span_size_t override;
 
    void instructions(drawing_variant, span<draw_operation> ops) override;
 
    auto bounding_sphere() -> math::sphere<float, true> override;
 
    void ray_intersections(
      drawing_variant,
      span<const math::line<float, true>> rays,
      span<optionally_valid<float>> intersections) override;
 
private:
    using _base = centered_unit_shape_generator_base;
 
    int _twist;
    int _rings;
    int _sections;
    float _radius_ratio{0.50F};
    float _thickness_ratio{0.1F};
 
    static auto _attr_mask() noexcept -> vertex_attrib_bits;
 
    template <typename T>
    void _indices(drawing_variant, span<T> dest) noexcept;
};
//------------------------------------------------------------------------------
static inline auto unit_twisted_torus(
  vertex_attrib_bits attr_bits,
  int twist,
  valid_if_greater_than<int, 2> rings,
  valid_if_greater_than<int, 3> sections,
  valid_if_ge0_lt1<float> radius_ratio) {
    return std::make_unique<unit_twisted_torus_gen>(
      attr_bits,
      twist,
      std::move(rings),
      std::move(sections),
      std::move(radius_ratio));
}
//------------------------------------------------------------------------------
static inline auto unit_twisted_torus(vertex_attrib_bits attr_bits) {
    return unit_twisted_torus(attr_bits, 12, 38, 12, 0.5F);
}
//------------------------------------------------------------------------------
} // namespace shapes
} // namespace eagine
 
#if !EAGINE_LINK_LIBRARY || defined(EAGINE_IMPLEMENTING_LIBRARY)
#include <eagine/shapes/twisted_torus.inl>
#endif
 
#endif // EAGINE_SHAPES_TWISTED_TORUS_HPP