ConstantInfoDefinitions.h

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//
// Copyright (C) 2002-2023 CERN for the benefit of the ATLAS collaboration
//
// Dear emacs, this is -*- c++ -*-
//
 
#ifndef CALORECGPU_CONSTANTINFODEFINITIONS_H
#define CALORECGPU_CONSTANTINFODEFINITIONS_H
 
#include "BaseDefinitions.h"
#include "Helpers.h"
 
#include "EtaPhiMap.h"
#include "NeighArr.h"
 
#include <cmath>
 
namespace CaloRecGPU
{
 
  class ConstantEnumConversion
  {
    protected:
    
    constexpr static int s_subcalo_unknown             = 999999;
    constexpr static int s_subcalo_unknown_replacement = 7;
    
    public:
    
    constexpr static int from_subcalo_enum(const int subcalo)
    {
      if (subcalo == s_subcalo_unknown)
      {
        return s_subcalo_unknown_replacement;
      }
      else
      {
        return subcalo;
      }
    }
    
    constexpr static int to_subcalo_enum(const int subcalo)
    {
      if (subcalo == s_subcalo_unknown_replacement)
      {
        return s_subcalo_unknown;
      }
      else
      {
        return subcalo;
      }
    }
    
    protected:
    
    constexpr static int s_region_unknown             = 999999;
    constexpr static int s_region_unknown_replacement = 7;
    
    public:
    
    constexpr static int from_region_enum(const int region)
    {
      if (region == s_region_unknown)
      {
        return s_region_unknown_replacement;
      }
      else
      {
        return region;
      }
    }
    
    constexpr static int to_region_enum(const int region)
    {
      if (region == s_region_unknown_replacement)
      {
        return s_region_unknown;
      }
      else
      {
        return region;
      }
    }
    
    protected:
    
    constexpr static int s_sampling_unknown             = 999999;
    constexpr static int s_sampling_unknown_replacement = 7;
    
    public:
    
    constexpr static int from_intra_calorimeter_sampling_enum(const int sampling)
    {
      if (sampling == s_sampling_unknown)
      {
        return s_sampling_unknown_replacement;
      }
      else
      {
        return sampling;
      }
    }
    
    constexpr static int to_intra_calorimeter_sampling_enum(const int sampling)
    {
      if (sampling == s_sampling_unknown_replacement)
      {
        return s_sampling_unknown;
      }
      else
      {
        return sampling;
      }
    }
    
  };
 

    struct OtherCellInfo
  {
    using carrier = unsigned int;
 
    carrier value;
 
private:
 
    static constexpr carrier s_sampling_mask       = 0x0000001FU;
    static constexpr carrier s_intra_sampling_mask = 0x000000E0U;
    static constexpr carrier s_subcalo_mask        = 0x00000700U;
    static constexpr carrier s_region_mask         = 0x00003800U;
    
    static constexpr carrier s_is_PS_flag          = 0x00004000U;
    static constexpr carrier s_is_HECIW_FCal_flag  = 0x00008000U;
    
    static constexpr carrier s_sampling_offset       =  0;
    static constexpr carrier s_intra_sampling_offset =  5;
    static constexpr carrier s_subcalo_offset        =  8;
    static constexpr carrier s_region_offset         = 11;
    
    static constexpr carrier s_bits_used       = s_sampling_mask       |
                                                 s_intra_sampling_mask |
                                                 s_subcalo_mask        |
                                                 s_region_mask         |
                                                 s_is_PS_flag          |
                                                 s_is_HECIW_FCal_flag;
    
    static constexpr carrier s_bits_unused     = ~s_bits_used;
 
public:
 
    constexpr operator carrier () const
    {
      return value;
    }
 
    constexpr OtherCellInfo (const carrier v): value(v)
    {
    }
 
    constexpr OtherCellInfo & operator = (const carrier v)
    {
      value = v;
      return (*this);
    }
 
    constexpr carrier sampling() const
    {
      return (value & s_sampling_mask) >> s_sampling_offset;
    }
 
    constexpr carrier intra_calorimeter_sampling() const
    {
      return (value & s_intra_sampling_mask) >> s_intra_sampling_offset;
    }
    
    constexpr carrier subcalo() const
    {
      return (value & s_subcalo_mask) >> s_subcalo_offset;
    }
 
    constexpr carrier region() const
    {
      return (value & s_region_mask) >> s_region_offset;
    }
    
    constexpr bool is_HECIW_or_FCal() const
    {
      return value & s_is_HECIW_FCal_flag;
    }
    
    constexpr bool is_PS() const
    {
      return value & s_is_PS_flag;
    }
 
    constexpr OtherCellInfo (const carrier sampling,
                             const carrier intra_calo_sampling,
                             const carrier subcalo,
                             const carrier region,
                             const bool PS,
                             const bool HECIW_or_FCal):
      value(0)
    {
      value  = ( sampling            << s_sampling_offset       ) |
               ( intra_calo_sampling << s_intra_sampling_offset ) |
               ( subcalo             << s_subcalo_offset        ) |
               ( region              << s_region_offset         ) |
               ( s_is_PS_flag * PS                              ) |
               ( s_is_HECIW_FCal_flag * HECIW_or_FCal           );
    }
  };
 
  struct GeometryArr
  {
    float x[NCaloCells];
    float y[NCaloCells];
    float z[NCaloCells];
    float r[NCaloCells];
    float eta[NCaloCells];
    float phi[NCaloCells];
 
    float dx[NCaloCells];
    float dy[NCaloCells];
    float dz[NCaloCells];
    float dr[NCaloCells];
    float deta[NCaloCells];
    float dphi[NCaloCells];
 
    float volume[NCaloCells];
    
    int   nCellsPerSampling[NumSamplings];
 
    NeighArr neighbours;
    
#if CALORECGPU_ADD_FULL_PAIRS_LIST_TO_CONSTANT_INFORMATION
    NeighPairsArr neighPairs;
#endif
 
    EtaPhiToCellMap etaPhiToCell;
 
    OtherCellInfo::carrier otherCellInfo[NCaloCells];
 
    constexpr static bool is_tile (const int cell)
    {
      return cell >= TileCellStart && cell < TileCellAfterEnd;
    }
    
    constexpr bool is_HECIW_or_FCal(const int cell) const
    {
      const OtherCellInfo cell_info = otherCellInfo[cell];
      return cell_info.is_HECIW_or_FCal();
    }
 
    constexpr bool is_PS(const int cell) const
    {
      const OtherCellInfo cell_info = otherCellInfo[cell];
      return cell_info.is_PS();
    }
    
    constexpr int sampling(const int cell) const
    {
      const OtherCellInfo cell_info = otherCellInfo[cell];
      return cell_info.sampling(); 
    }
    
    constexpr int intra_calorimeter_sampling(const int cell) const
    {
      const OtherCellInfo cell_info = otherCellInfo[cell];
      return cell_info.intra_calorimeter_sampling(); 
    }
    
    constexpr int subcalo(const int cell) const
    {
      const OtherCellInfo cell_info = otherCellInfo[cell];
      return cell_info.subcalo(); 
    }
    
    constexpr int region(const int cell) const
    {
      const OtherCellInfo cell_info = otherCellInfo[cell];
      return cell_info.region(); 
    }
    
    constexpr int get_neighbours(const unsigned int neigh_options, const int cell, int * neigh_arr) const
    {
      return neighbours.get_neighbours(neigh_options, cell, neigh_arr);
    }
 
    constexpr int get_number_of_neighbours(const unsigned int neigh_options, const int cell) const
    {
      return neighbours.get_number_of_neighbours(neigh_options, cell);
    }
 
    CUDA_HOS_DEV void fill_eta_phi_map()
    {
      for (int i = 0; i < NCaloCells; ++i)
        {
          etaPhiToCell.register_cell(i, sampling(i), eta[i], phi[i], deta[i], dphi[i]);
        }
 
      struct DeAllocWrapper
      {
        int * buf;
        CUDA_HOS_DEV DeAllocWrapper(const size_t new_size)
        {
          buf = new int[Helpers::int_ceil_div(new_size, sizeof(int))];
        }
        CUDA_HOS_DEV  ~DeAllocWrapper()
        {
          delete[] buf;
        }
        CUDA_HOS_DEV DeAllocWrapper (const DeAllocWrapper &) = delete;
        CUDA_HOS_DEV DeAllocWrapper (DeAllocWrapper &&) = delete;
        CUDA_HOS_DEV DeAllocWrapper & operator=(const DeAllocWrapper &) = delete;
        CUDA_HOS_DEV DeAllocWrapper & operator=(DeAllocWrapper &&) = delete;
      };
      //Simple allocation/de-allocation
      //to still be GPU-compatible if needed
      //(new and delete valid on GPU code...),
      //while still preventing leaks,
      //all without pulling in unique_ptr.
 
      DeAllocWrapper wrapper(etaPhiToCell.finish_initializing_buffer_size());
 
#if CALORECGPU_ETA_PHI_MAP_DEBUG
      printf("CALORECGPU ETA PHI MAP DEBUG OUTPUT: Max occupied cells is %d\n", etaPhiToCell.get_max_real_overlap());
#endif
      etaPhiToCell.finish_initializing(wrapper.buf);
 
    }
 
    constexpr int get_closest_cell(const int sampling, const float test_eta, const float test_phi) const
    {
      int cells[EtaPhiToCellMap::s_max_overlap_cells] = {};
 
      const int n_cells = etaPhiToCell.get_possible_cells_from_coords(sampling, test_eta, test_phi, cells);
 
      if (n_cells < 1)
        {
          return -1;
        }
      else if (n_cells == 1)
        {
          return cells[0];
        }
      else
        {
          float distance = 1e38f;
          int ret = -1;
 
          for (int i = 0; i < n_cells; ++i)
            {
              const int this_cell = cells[i];
 
              const float delta_eta = eta[this_cell] - test_eta;
              const float delta_phi = Helpers::angular_difference(phi[this_cell], test_phi);
              
              using namespace std;
 
              const float this_dist = fabsf(delta_eta) + fabsf(delta_phi);
              if (this_dist < distance || (this_dist == distance && this_cell > ret))
                {
                  distance = this_dist;
                  ret = this_cell;
                }
            }
          return ret;
        }
    }
  };
 
  struct CellNoiseProperties
  {
    using carrier = unsigned int;
    carrier value;
 
   protected:
 
    static constexpr carrier s_first_16_bit_mask = 0x0000FFFFU;
    static constexpr carrier s_last_16_bit_mask  = 0xFFFF0000U;
    static constexpr carrier s_invalid_double_gaussian = s_first_16_bit_mask | s_last_16_bit_mask;
 
   public:
 
 
    constexpr operator carrier () const
    {
      return value;
    }
 
    constexpr CellNoiseProperties (const carrier v): value(v)
    {
    }
 
    constexpr CellNoiseProperties & operator = (const carrier v)
    {
      value = v;
      return (*this);
    }
 
    constexpr carrier version() const
    {
      return value & s_first_16_bit_mask;
    }
 
    constexpr carrier noise_type() const
    {
      return (value & s_last_16_bit_mask) >> 16;
    }
 
    constexpr bool is_electronic_noise() const
    {
      return is_valid() && ((value & s_last_16_bit_mask) == 0x00000000U);
    }
    
    constexpr bool is_pile_up_noise() const
    {
      return is_valid() && ((value & s_last_16_bit_mask) == 0x00010000U);
    }
 
    constexpr bool is_total_noise() const
    {
      return is_valid() && ((value & s_last_16_bit_mask) == 0x00020000U);
    }
    
    constexpr CellNoiseProperties (const carrier version, const carrier noise_type):
      value(noise_type)
    {
      value = (value << 16) | (version & s_first_16_bit_mask);
    }
 
    constexpr bool is_invalid() const
    {
      return value == s_invalid_double_gaussian;
    }
 
    constexpr bool is_valid() const
    {
      return !is_invalid();
    }
 
    static constexpr carrier invalid_value()
    {
      return s_invalid_double_gaussian;
    }
 
  };
 
  struct CellNoiseArr
  {
    static constexpr int s_numDoubleGaussianConstants = 4;
 
    float noise[NCaloCells][NumGainStates];
    //Given the low number of possible gain sates
 
    float double_gaussian_constants[s_numDoubleGaussianConstants][NTileCells][NumGainStates];
 
    CellNoiseProperties::carrier noise_properties;
 
    float luminosity;
 
    constexpr float get_noise(const int cell, const int gain) const
    {
      return noise[cell][gain];
    }
 
   protected:
 
    CUDA_HOS_DEV float get_double_gaussian_significance(const int cell, const int gain, const float energy) const
    {
 
      using namespace std;
 
      const int delta_from_tile_start = cell - TileCellStart;
 
      const float sigma_1 = this->double_gaussian_constants[0][delta_from_tile_start][gain];
      const float sigma_2 = this->double_gaussian_constants[1][delta_from_tile_start][gain];
      const float ratio   = this->double_gaussian_constants[2][delta_from_tile_start][gain];
      
      if ((sigma_1 == 0.f && sigma_2 == 0.f) || energy == 0.f)
        {
          return 0.f;
        }
      else if (sigma_1 == 0.f)
        {
          return energy / sigma_2;
        }
      else if (ratio == 0.f || sigma_2 == 0.f)
        {
          return energy / sigma_1;
        }
        
      const float x_1 = energy / sigma_1;
      const float x_2 = energy / sigma_2;
      const float x_1_abs = fabsf(x_1);
      const float x_2_abs = fabsf(x_2);
 
      const float min_abs = min(x_1_abs, x_2_abs);
 
      const float max_abs = max(x_1_abs, x_2_abs);
 
      if (min_abs > 7.4f)
        {
          return min_abs;
        }
      if (max_abs < 0.9f)
        {
          return max_abs;
        }
 
      const float y_1 = erff(Helpers::Constants::inv_sqrt2<float> * x_1);
      const float y_2 = erff(Helpers::Constants::inv_sqrt2<float> * x_2);
      
 
      const float z = (y_1 * sigma_1 + ratio * y_2 * sigma_2) / (sigma_1 + ratio * sigma_2);
      
      const float ret = Helpers::Constants::sqrt2<float> * Helpers::erf_inv_wrapper(z);
      
      //printf("GPU %d %f %f %f %f %f %f\n", delta_from_tile_start, min_abs, max_abs, y_1, y_2, z, ret);
      
      return ret;
 
    }
 
   public:

    CUDA_HOS_DEV float get_double_gaussian_noise(const int cell, const int gain, const float energy) const
    {
      using namespace std;
 
      CellNoiseProperties props(this->noise_properties);
      if (!props.is_valid())
        {
          return get_noise(cell, gain);
        }
 
      const float sigma = get_double_gaussian_significance(cell, gain, energy);
 
      const float first_factor = (sigma != 0.f ? fabsf(energy / sigma) : 0.f);
 
      if (props.is_electronic_noise())
        {
          return first_factor;
        }
      else
        {
          const float second_factor = this->double_gaussian_constants[3][cell - TileCellStart][gain];
 
          switch (props.version())
            {
              case 1:
                return sqrtf(first_factor * first_factor + second_factor * second_factor * this->luminosity);
              case 2:
                return first_factor + second_factor * this->luminosity;
              default:
                return 0.f / 0.f;
            }
        }
    }
 
  };
 
}
 
#endif