sphere.hpp

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#ifndef EAGINE_SHAPES_SPHERE_HPP
#define EAGINE_SHAPES_SPHERE_HPP
 
#include "../config/basic.hpp"
#include "../valid_if/greater_than.hpp"
#include "gen_base.hpp"
#include <cassert>
 
namespace eagine {
namespace shapes {
//------------------------------------------------------------------------------
class unit_sphere_gen : public centered_unit_shape_generator_base {
public:
    unit_sphere_gen(
      vertex_attrib_bits attr_bits,
      valid_if_greater_than<int, 2> rings,
      valid_if_greater_than<int, 3> sections) noexcept;
 
    unit_sphere_gen(vertex_attrib_bits attr_bits) noexcept
      : unit_sphere_gen(attr_bits, 12, 18) {}
 
    auto vertex_count() -> span_size_t override;
 
    void positions(span<float> dest) noexcept;
 
    void normals(span<float> dest) noexcept;
 
    void tangentials(span<float> dest) noexcept;
 
    void bitangentials(span<float> dest) noexcept;
 
    void wrap_coords(span<float> dest) noexcept;
 
    void attrib_values(vertex_attrib_variant, span<float>) override;
 
    auto index_type(drawing_variant) -> index_data_type override;
 
    auto index_count(drawing_variant) -> span_size_t override;
 
    void indices(drawing_variant, span<std::uint8_t> dest) override;
 
    void indices(drawing_variant, span<std::uint16_t> dest) override;
 
    void indices(drawing_variant, span<std::uint32_t> dest) 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;
 
    span_size_t _rings;
    span_size_t _sections;
 
    static auto _attr_mask() noexcept -> vertex_attrib_bits;
 
    template <typename T>
    void _indices(drawing_variant, span<T> dest) noexcept;
};
//------------------------------------------------------------------------------
static inline auto unit_sphere(
  vertex_attrib_bits attr_bits,
  valid_if_greater_than<int, 2> rings,
  valid_if_greater_than<int, 3> sections) {
    return std::make_unique<unit_sphere_gen>(
      attr_bits, std::move(rings), std::move(sections));
}
//------------------------------------------------------------------------------
static inline auto unit_sphere(vertex_attrib_bits attr_bits) {
    return unit_sphere(attr_bits, 18, 36);
}
//------------------------------------------------------------------------------
} // namespace shapes
} // namespace eagine
 
#if !EAGINE_LINK_LIBRARY || defined(EAGINE_IMPLEMENTING_LIBRARY)
#include <eagine/shapes/sphere.inl>
#endif
 
#endif // EAGINE_SHAPES_SPHERE_HPP