EBGeometry_Affine.hpp

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// SPDX-FileCopyrightText: 2026 Robert Marskar <robert.marskar@sintef.no>
//
// SPDX-License-Identifier: GPL-3.0-or-later
 
#ifndef EBGEOMETRY_AFFINE_HPP
#define EBGEOMETRY_AFFINE_HPP
 
// Std includes
#include <cstddef>
#include <type_traits>
 
// Our includes
#include "EBGeometry_BoundingVolumes.hpp"
#include "EBGeometry_GPU.hpp"
#include "EBGeometry_Vec.hpp"
 
namespace EBGeometry {
 
template <class T>
struct Affine3T
{
  static_assert(std::is_floating_point_v<T>, "Affine3T requires a floating-point type T");
 
  Vec3T<T> m_row0;
 
  Vec3T<T> m_row1;
 
  Vec3T<T> m_row2;
 
  Vec3T<T> m_shift;
 
  [[nodiscard]] EBGEOMETRY_HOST_DEVICE
  static inline Affine3T
  identity() noexcept;
 
  [[nodiscard]] EBGEOMETRY_HOST_DEVICE
  static inline Affine3T
  translation(const Vec3T<T>& a_shift) noexcept;
 
  [[nodiscard]] EBGEOMETRY_HOST_DEVICE
  static inline Affine3T
  rotation(const T a_degrees, const size_t a_axis) noexcept;
 
  [[nodiscard]] EBGEOMETRY_HOST_DEVICE
  static inline Affine3T
  rotation(const T a_degrees, const Vec3T<T>& a_axis) noexcept;
 
  [[nodiscard]] EBGEOMETRY_HOST_DEVICE
  static inline Affine3T
  scaling(const T a_factor) noexcept;
 
  [[nodiscard]] EBGEOMETRY_HOST_DEVICE
  static inline Affine3T
  reflection(const size_t a_axis) noexcept;
 
  [[nodiscard]] EBGEOMETRY_HOST_DEVICE
  inline Vec3T<T>
  operator()(const Vec3T<T>& a_point) const noexcept;
 
  [[nodiscard]] EBGEOMETRY_HOST_DEVICE
  inline Affine3T
  then(const Affine3T& a_next) const noexcept;
 
  [[nodiscard]] EBGEOMETRY_HOST_DEVICE
  inline bool
  isAxisAligned() const noexcept;
 
  [[nodiscard]] EBGEOMETRY_HOST_DEVICE
  inline BoundingVolumes::AABBT<T>
  transform(const BoundingVolumes::AABBT<T>& a_box) const noexcept;
};
 
static_assert(std::is_trivially_copyable_v<Affine3T<float>>, "Affine3T<float> must be trivially copyable");
static_assert(std::is_trivially_copyable_v<Affine3T<double>>, "Affine3T<double> must be trivially copyable");
 
} // namespace EBGeometry
 
#include "EBGeometry_AffineImplem.hpp"
 
#endif