box.h

//----------------------------------------------------------------------------//
//                                                                            //
// ozz-animation is hosted at http://github.com/guillaumeblanc/ozz-animation  //
// and distributed under the MIT License (MIT).                               //
//                                                                            //
// Copyright (c) Guillaume Blanc                                              //
//                                                                            //
// Permission is hereby granted, free of charge, to any person obtaining a    //
// copy of this software and associated documentation files (the "Software"), //
// to deal in the Software without restriction, including without limitation  //
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//----------------------------------------------------------------------------//
 
#ifndef OZZ_OZZ_BASE_MATHS_BOX_H_
#define OZZ_OZZ_BASE_MATHS_BOX_H_
 
#include <cstddef>
 
#include "ozz/base/maths/vec_float.h"
 
namespace ozz {
namespace math {
 
// Matrix forward declaration.
struct Float4x4;
 
// Defines an axis aligned box.
struct OZZ_BASE_DLL Box {
  // Constructs an invalid box.
  Box();
 
  // Constructs a box with the specified _min and _max bounds.
  Box(const Float3& _min, const Float3& _max) : min(_min), max(_max) {}
 
  // Constructs the smallest box that contains the _count points _points.
  // _stride is the number of bytes between points.
  explicit Box(const Float3& _point) : min(_point), max(_point) {}
 
  // Constructs the smallest box that contains the _count points _points.
  // _stride is the number of bytes between points, it must be greater or
  // equal to sizeof(Float3).
  Box(const Float3* _points, size_t _stride, size_t _count);
 
  // Tests whether *this is a valid box.
  bool is_valid() const { return min <= max; }
 
  // Tests whether _p is within box bounds.
  bool is_inside(const Float3& _p) const { return _p >= min && _p <= max; }
 
  // Box's min and max bounds.
  Float3 min;
  Float3 max;
};
 
// Merges two boxes _a and _b.
// Both _a and _b can be invalid.
OZZ_INLINE Box Merge(const Box& _a, const Box& _b) {
  if (!_a.is_valid()) {
    return _b;
  } else if (!_b.is_valid()) {
    return _a;
  }
  return Box(Min(_a.min, _b.min), Max(_a.max, _b.max));
}
 
// Compute box transformation by a matrix.
OZZ_BASE_DLL Box TransformBox(const Float4x4& _matrix, const Box& _box);
}  // namespace math
}  // namespace ozz
#endif  // OZZ_OZZ_BASE_MATHS_BOX_H_