grid_refiner_criterion.h

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// SPDX-FileCopyrightText: © 2025 PRISMS Center at the University of Michigan
// SPDX-License-Identifier: GNU Lesser General Public Version 2.1
 
#pragma once
 
#include <deal.II/base/exceptions.h>
 
#include <prismspf/core/types.h>
 
#include <prismspf/config.h>
 
#include <cfloat>
#include <cstdint>
#include <string>
 
PRISMS_PF_BEGIN_NAMESPACE
 
enum RefinementFlags : std::uint8_t
{
  Nothing = 0,
 
  Value = 0x0001,
 
  Gradient = 0x0002,
};
 
// Function that enables bitwise OR between flags
inline constexpr RefinementFlags
operator|(const RefinementFlags flag_1, const RefinementFlags flag_2)
{
  return static_cast<RefinementFlags>(static_cast<unsigned int>(flag_1) |
                                      static_cast<unsigned int>(flag_2));
}
 
// Function that enables bitwise compound OR between flags
inline constexpr RefinementFlags &
operator|=(RefinementFlags &flag_1, const RefinementFlags flag_2)
{
  flag_1 = flag_1 | flag_2;
  return flag_1;
}
 
// Function that enables bitwise AND between flags
inline constexpr RefinementFlags
operator&(const RefinementFlags flag_1, const RefinementFlags flag_2)
{
  return static_cast<RefinementFlags>(static_cast<unsigned int>(flag_1) &
                                      static_cast<unsigned int>(flag_2));
}
 
// Function that enables bitwise compound AND between flags
inline constexpr RefinementFlags &
operator&=(RefinementFlags &flag_1, const RefinementFlags flag_2)
{
  flag_1 = flag_1 & flag_2;
  return flag_1;
}
 
struct RefinementCriterion
{
  explicit RefinementCriterion(
    const RefinementFlags &_criterion            = RefinementFlags::Nothing,
    const double          &_value_lower_bound    = DBL_MAX,
    const double          &_value_upper_bound    = DBL_MAX,
    const double          &_gradient_lower_bound = DBL_MAX)
    : criterion(_criterion)
    , value_lower_bound(_value_lower_bound)
    , value_upper_bound(_value_upper_bound)
    , gradient_lower_bound(_gradient_lower_bound) {};
 
  [[nodiscard]] bool
  value_in_open_range(double value) const
  {
    return value > value_lower_bound && value < value_upper_bound;
  }
 
  [[nodiscard]] bool
  gradient_magnitude_above_threshold(double gradient_magnitude) const
  {
    return gradient_magnitude > gradient_lower_bound;
  }
 
  [[nodiscard]] std::string
  criterion_string() const
  {
    if (criterion == RefinementFlags::Nothing)
      {
        return "None";
      }
    if (((criterion & RefinementFlags::Value) != 0U) &&
        ((criterion & RefinementFlags::Gradient) != 0U))
      {
        return "Value and gradient";
      }
    if ((criterion & RefinementFlags::Value) != 0U)
      {
        return "Value";
      }
    if ((criterion & RefinementFlags::Gradient) != 0U)
      {
        return "Gradient";
      }
 
    return "Unknown criterion";
  }
 
  RefinementFlags criterion            = RefinementFlags::Nothing;
  double          value_lower_bound    = DBL_MAX;
  double          value_upper_bound    = DBL_MAX;
  double          gradient_lower_bound = DBL_MAX;
};
 
PRISMS_PF_END_NAMESPACE