GPUTRDTrackData.h

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// Copyright 2019-2020 CERN and copyright holders of ALICE O2.
// See https://alice-o2.web.cern.ch/copyright for details of the copyright holders.
// All rights not expressly granted are reserved.
//
// This software is distributed under the terms of the GNU General Public
// License v3 (GPL Version 3), copied verbatim in the file "COPYING".
//
// In applying this license CERN does not waive the privileges and immunities
// granted to it by virtue of its status as an Intergovernmental Organization
// or submit itself to any jurisdiction.
 
 
 
#ifndef GPUTRDTRACKDATA_H
#define GPUTRDTRACKDATA_H
 
struct GPUTRDTrackDataRecord {
  float mAlpha;              // azimuthal angle of reference frame
  float fX;                  // x: radial distance
  float fY;                  // local Y-coordinate of a track (cm)
  float fZ;                  // local Z-coordinate of a track (cm)
  float mSinPhi;             // local sine of the track momentum azimuthal angle
  float fTgl;                // tangent of the track momentum dip angle
  float fq1Pt;               // 1/pt (1/(GeV/c))
  float fC[15];              // covariance matrix
  int32_t fTPCTrackID;       // id of corresponding TPC track
  int32_t fAttachedTracklets[6]; // IDs for attached tracklets sorted by layer
  uint8_t mIsPadrowCrossing;     // bits 0 to 5 indicate whether a padrow was crossed
 
  int32_t GetNTracklets() const
  {
    int32_t n = 0;
    for (int32_t i = 0; i < 6; i++) {
      if (fAttachedTracklets[i] >= 0) {
        n++;
      }
    }
    return n;
  }
};
 
typedef struct GPUTRDTrackDataRecord GPUTRDTrackDataRecord;
 
struct GPUTRDTrackData {
  uint32_t fCount; // number of tracklets
#if defined(__HP_aCC) || defined(__DECCXX) || defined(__SUNPRO_CC)
  GPUTRDTrackDataRecord fTracks[1]; // array of tracklets
#else
  GPUTRDTrackDataRecord fTracks[0]; // array of tracklets
#endif
  static size_t GetSize(uint32_t nTracks)
  {
    return sizeof(GPUTRDTrackData) + nTracks * sizeof(GPUTRDTrackDataRecord);
  }
  size_t GetSize() const { return GetSize(fCount); }
};
 
typedef struct GPUTRDTrackData GPUTRDTrackData;
 
#endif // GPUTRDTRACKDATA_H