src/broadphase/detail/morton-inl.h

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#ifndef HPP_FCL_MORTON_INL_H
#define HPP_FCL_MORTON_INL_H

#include "hpp/fcl/broadphase/detail/morton.h"

namespace hpp {
namespace fcl {  
namespace detail {

//==============================================================================
template <typename S>
uint32_t quantize(S x, uint32_t n) {
  return std::max(std::min((uint32_t)(x * (S)n), uint32_t(n - 1)), uint32_t(0));
}

//==============================================================================
template <typename S>
morton_functor<S, uint32_t>::morton_functor(const AABB& bbox)
    : base(bbox.min_),
      inv(1.0 / (bbox.max_[0] - bbox.min_[0]),
          1.0 / (bbox.max_[1] - bbox.min_[1]),
          1.0 / (bbox.max_[2] - bbox.min_[2])) {
  // Do nothing
}

//==============================================================================
template <typename S>
uint32_t morton_functor<S, uint32_t>::operator()(const Vec3f& point) const {
  uint32_t x = detail::quantize((point[0] - base[0]) * inv[0], 1024u);
  uint32_t y = detail::quantize((point[1] - base[1]) * inv[1], 1024u);
  uint32_t z = detail::quantize((point[2] - base[2]) * inv[2], 1024u);

  return detail::morton_code(x, y, z);
}

//==============================================================================
template <typename S>
morton_functor<S, uint64_t>::morton_functor(const AABB& bbox)
    : base(bbox.min_),
      inv(1.0 / (bbox.max_[0] - bbox.min_[0]),
          1.0 / (bbox.max_[1] - bbox.min_[1]),
          1.0 / (bbox.max_[2] - bbox.min_[2])) {
  // Do nothing
}

//==============================================================================
template <typename S>
uint64_t morton_functor<S, uint64_t>::operator()(const Vec3f& point) const {
  uint32_t x = detail::quantize((point[0] - base[0]) * inv[0], 1u << 20);
  uint32_t y = detail::quantize((point[1] - base[1]) * inv[1], 1u << 20);
  uint32_t z = detail::quantize((point[2] - base[2]) * inv[2], 1u << 20);

  return detail::morton_code60(x, y, z);
}

//==============================================================================
template <typename S>
constexpr size_t morton_functor<S, uint64_t>::bits() {
  return 60;
}

//==============================================================================
template <typename S>
constexpr size_t morton_functor<S, uint32_t>::bits() {
  return 30;
}

//==============================================================================
template <typename S, size_t N>
morton_functor<S, std::bitset<N>>::morton_functor(const AABB& bbox)
    : base(bbox.min_),
      inv(1.0 / (bbox.max_[0] - bbox.min_[0]),
          1.0 / (bbox.max_[1] - bbox.min_[1]),
          1.0 / (bbox.max_[2] - bbox.min_[2])) {
  // Do nothing
}

//==============================================================================
template <typename S, size_t N>
std::bitset<N> morton_functor<S, std::bitset<N>>::operator()(
    const Vec3f& point) const {
  S x = (point[0] - base[0]) * inv[0];
  S y = (point[1] - base[1]) * inv[1];
  S z = (point[2] - base[2]) * inv[2];
  int start_bit = bits() - 1;
  std::bitset<N> bset;

  x *= 2;
  y *= 2;
  z *= 2;

  for (size_t i = 0; i < bits() / 3; ++i) {
    bset[start_bit--] = ((z < 1) ? 0 : 1);
    bset[start_bit--] = ((y < 1) ? 0 : 1);
    bset[start_bit--] = ((x < 1) ? 0 : 1);
    x = ((x >= 1) ? 2 * (x - 1) : 2 * x);
    y = ((y >= 1) ? 2 * (y - 1) : 2 * y);
    z = ((z >= 1) ? 2 * (z - 1) : 2 * z);
  }

  return bset;
}

//==============================================================================
template <typename S, size_t N>
constexpr size_t morton_functor<S, std::bitset<N>>::bits() {
  return N;
}

}  // namespace detail
}  // namespace fcl
}  // namespace hpp

#endif