#pragma once

#include <base/subface.hpp>

namespace internal
{
// local: a sphere with center at (0, 0, 0) and radius 1
// u: planar angle from x-axis to z-axis
// v: polar angle from xz-plane to y-axis
// EDIT: recap v from [-pi/2, pi/2] to [0, pi]
struct sphere_face_t final : subface {
};
} // namespace internal

namespace detail
{
template <>
struct hasher<internal::sphere_face_t> {
    size_t operator()(const internal::sphere_face_t& subface) const { return hash_funcs(subface.local_to_world); }
};

template <>
struct eq_compare<internal::sphere_face_t> {
    bool operator()(const internal::sphere_face_t& lhs, const internal::sphere_face_t& rhs) const
    {
        return eq_funcs(lhs.local_to_world, rhs.local_to_world);
    }
};
} // namespace detail