array.hpp

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#ifndef EAGINE_SHAPES_ARRAY_HPP
#define EAGINE_SHAPES_ARRAY_HPP
 
#include "delegated.hpp"
#include <eagine/config/basic.hpp>
#include <array>
 
namespace eagine {
namespace shapes {
//------------------------------------------------------------------------------
class array_gen : public delegated_gen {
private:
    std::array<float, 3> _d;
    span_size_t _copies;
 
    template <typename T>
    void _indices(drawing_variant, span<T> dest) noexcept;
 
public:
    array_gen(
      std::shared_ptr<generator> gen,
      std::array<float, 3> d,
      span_size_t n) noexcept
      : delegated_gen{std::move(gen)}
      , _d{d}
      , _copies{n} {}
 
    auto vertex_count() -> span_size_t override;
 
    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;
};
//------------------------------------------------------------------------------
static inline auto array(
  std::shared_ptr<generator> gen,
  std::array<float, 3> d,
  span_size_t count) noexcept {
    return std::make_unique<array_gen>(std::move(gen), d, count);
}
//------------------------------------------------------------------------------
static inline auto ortho_array_xyz(
  std::shared_ptr<generator> gen,
  std::array<float, 3> d,
  std::array<span_size_t, 3> n) noexcept {
    const float z = 0.0F;
    return array(
      array(array(std::move(gen), {d[0], z, z}, n[0]), {z, d[1], z}, n[1]),
      {z, z, d[2]},
      n[2]);
}
//------------------------------------------------------------------------------
} // namespace shapes
} // namespace eagine
 
#if !EAGINE_LINK_LIBRARY || defined(EAGINE_IMPLEMENTING_LIBRARY)
#include <eagine/shapes/array.inl>
#endif
 
#endif // EAGINE_SHAPES_ARRAY_HPP