[u/mrichter/AliRoot.git] / HLT / TPCLib / tracking-ca / AliHLTTPCCANeighboursFinder.cxx

// @(#) $Id: AliHLTTPCCANeighboursFinder1.cxx 27042 2008-07-02 12:06:02Z richterm $
// **************************************************************************
// This file is property of and copyright by the ALICE HLT Project          *
// ALICE Experiment at CERN, All rights reserved.                           *
//                                                                          *
// Primary Authors: Sergey Gorbunov <sergey.gorbunov@kip.uni-heidelberg.de> *
//                  Ivan Kisel <kisel@kip.uni-heidelberg.de>                *
//                  for The ALICE HLT Project.                              *
//                                                                          *
// Permission to use, copy, modify and distribute this software and its     *
// documentation strictly for non-commercial purposes is hereby granted     *
// without fee, provided that the above copyright notice appears in all     *
// copies and that both the copyright notice and this permission notice     *
// appear in the supporting documentation. The authors make no claims       *
// about the suitability of this software for any purpose. It is            *
// provided "as is" without express or implied warranty.                    *
//                                                                          *
//***************************************************************************

#include "AliHLTTPCCANeighboursFinder.h"
#include "AliHLTTPCCAMath.h"
#include "AliHLTTPCCAHitArea.h"
#include "AliHLTTPCCATracker.h"
#include "AliHLTTPCCAHit.h"

//#define DRAW

#ifdef DRAW
#include "AliHLTTPCCADisplay.h"
#endif //DRAW

GPUdi() void AliHLTTPCCANeighboursFinder::Thread
( int /*nBlocks*/, int nThreads, int iBlock, int iThread, int iSync,
  AliHLTTPCCASharedMemory &s, AliHLTTPCCATracker &tracker )
{
  //* find neighbours

  if ( iSync == 0 ) {
#ifdef HLTCA_GPUCODE
	for (int i = iThread;i < sizeof(AliHLTTPCCARow) / sizeof(int);i += nThreads)
	{
		reinterpret_cast<int*>(&s.fRow)[i] = reinterpret_cast<int*>(&tracker.SliceDataRows()[iBlock])[i];
		if (iBlock >= 2 && iBlock <= tracker.Param().NRows() - 3)
		{
			reinterpret_cast<int*>(&s.fRowUp)[i] = reinterpret_cast<int*>(&tracker.SliceDataRows()[iBlock + 2])[i];
			reinterpret_cast<int*>(&s.fRowDown)[i] = reinterpret_cast<int*>(&tracker.SliceDataRows()[iBlock - 2])[i];
		}
	}
	__syncthreads();
#endif
    if ( iThread == 0 ) {
      s.fNRows = tracker.Param().NRows();
      s.fIRow = iBlock;
      if ( s.fIRow < s.fNRows ) {
#ifdef HLTCA_GPUCODE
		const AliHLTTPCCARow &row = s.fRow;
#else
		const AliHLTTPCCARow &row = tracker.Row( s.fIRow );
#endif
        s.fNHits = row.NHits();

        if ( ( s.fIRow >= 2 ) && ( s.fIRow <= s.fNRows - 3 ) ) {
          s.fIRowUp = s.fIRow + 2;
          s.fIRowDn = s.fIRow - 2;

          // references to the rows above and below

#ifdef HLTCA_GPUCODE
          const AliHLTTPCCARow &rowUp = s.fRowUp;
          const AliHLTTPCCARow &rowDn = s.fRowDown;
#else
          const AliHLTTPCCARow &rowUp = tracker.Row( s.fIRowUp );
          const AliHLTTPCCARow &rowDn = tracker.Row( s.fIRowDn );
#endif
          // the axis perpendicular to the rows
          const float xDn = rowDn.X();
          const float x   = row.X();
          const float xUp = rowUp.X();

          // number of hits in rows above and below
          s.fUpNHits = tracker.Row( s.fIRowUp ).NHits();
          s.fDnNHits = tracker.Row( s.fIRowDn ).NHits();

          // distance of the rows (absolute and relative)
          s.fUpDx = xUp - x;
          s.fDnDx = xDn - x;
          s.fUpTx = xUp / x;
          s.fDnTx = xDn / x;
          // UpTx/DnTx is used to move the HitArea such that central events are preferred (i.e. vertices
          // coming from y = 0, z = 0).

          //s.fGridUp = tracker.Row( s.fIRowUp ).Grid();
          //s.fGridDn = tracker.Row( s.fIRowDn ).Grid();
        }
      }
    }
  } else if ( iSync == 1 ) {
    if ( s.fIRow < s.fNRows ) {
      if ( ( s.fIRow <= 1 ) || ( s.fIRow >= s.fNRows - 2 ) ) {
#ifdef HLTCA_GPUCODE
		const AliHLTTPCCARow &row = s.fRow;
#else
		const AliHLTTPCCARow &row = tracker.Row( s.fIRow );
#endif
        for ( int ih = iThread; ih < s.fNHits; ih += nThreads ) {
          tracker.SetHitLinkUpData( row, ih, -1 );
          tracker.SetHitLinkDownData( row, ih, -1 );
        }
      } else {
/*#ifdef HLTCA_GPUCODE
          const AliHLTTPCCARow &rowUp = s.fRowUp;
          const AliHLTTPCCARow &rowDn = s.fRowDown;
#else
          const AliHLTTPCCARow &rowUp = tracker.Row( s.fIRowUp );
          const AliHLTTPCCARow &rowDn = tracker.Row( s.fIRowDn );
#endif

        for ( unsigned int ih = iThread; ih < s.fGridUp.N() + s.fGridUp.Ny() + 2; ih += nThreads ) {
          s.fGridContentUp[ih] = tracker.FirstHitInBin( rowUp, ih );
        }
        for ( unsigned int ih = iThread; ih < s.fGridDn.N() + s.fGridDn.Ny() + 2; ih += nThreads ) {
          s.fGridContentDn[ih] = tracker.FirstHitInBin( rowDn, ih );
        }*/
      }
    }
  } else if ( iSync == 2 ) {

#ifdef HLTCA_GPUCODE
    if ( ( iBlock <= 1 ) || ( iBlock >= s.fNRows - 2 ) ) return;
#else
    if ( ( s.fIRow <= 1 ) || ( s.fIRow >= s.fNRows - 2 ) ) return;
#endif

    float chi2Cut = 3.*3.*4 * ( s.fUpDx * s.fUpDx + s.fDnDx * s.fDnDx );
    const float kAreaSize = tracker.Param().NeighboursSearchArea();
    //float chi2Cut = 3.*3.*(s.fUpDx*s.fUpDx + s.fDnDx*s.fDnDx ); //SG
#define kMaxN 20

#ifdef HLTCA_GPUCODE
		  const AliHLTTPCCARow &row = s.fRow;
          const AliHLTTPCCARow &rowUp = s.fRowUp;
          const AliHLTTPCCARow &rowDn = s.fRowDown;
#else
		  const AliHLTTPCCARow &row = tracker.Row( s.fIRow );
		  const AliHLTTPCCARow &rowUp = tracker.Row( s.fIRowUp );
          const AliHLTTPCCARow &rowDn = tracker.Row( s.fIRowDn );
#endif
    const float y0 = row.Grid().YMin();
    const float z0 = row.Grid().ZMin();
    const float stepY = row.HstepY();
    const float stepZ = row.HstepZ();

	for ( int ih = iThread; ih < s.fNHits; ih += nThreads ) {

      int linkUp = -1;
      int linkDn = -1;

      if ( s.fDnNHits > 0 && s.fUpNHits > 0 ) {

       

        // coordinates of the hit in the current row
#if defined(HLTCA_GPU_TEXTURE_FETCHa)
		ushort2 tmpval = tex1Dfetch(gAliTexRefu2, ((char*) tracker.Data().HitData() - tracker.Data().GPUTextureBase()) / sizeof(ushort2) + row.HitNumberOffset() + ih);
        const float y = y0 + tmpval.x * stepY;
        const float z = z0 + tmpval.y * stepZ;
#else
        const float y = y0 + tracker.HitDataY( row, ih ) * stepY;
        const float z = z0 + tracker.HitDataZ( row, ih ) * stepZ;
#endif

#if ALIHLTTPCCANEIGHBOURS_FINDER_MAX_NNEIGHUP > 0
      unsigned short *neighUp = s.fB[iThread];
      float2 *yzUp = s.fA[iThread];
#if defined(HLTCA_GPUCODE) & kMaxN > ALIHLTTPCCANEIGHBOURS_FINDER_MAX_NNEIGHUP
	  unsigned short neighUp2[kMaxN - ALIHLTTPCCANEIGHBOURS_FINDER_MAX_NNEIGHUP];
	  float2 yzUp2[kMaxN - ALIHLTTPCCANEIGHBOURS_FINDER_MAX_NNEIGHUP];
#endif
#else
      unsigned short neighUp[kMaxN];
      float2 yzUp[kMaxN];
#endif //ALIHLTTPCCANEIGHBOURS_FINDER_MAX_NNEIGHUP > 0

		int nNeighUp = 0;
        AliHLTTPCCAHitArea areaDn, areaUp;
        areaUp.Init( rowUp, tracker.Data(), y*s.fUpTx, z*s.fUpTx, kAreaSize, kAreaSize );
        areaDn.Init( rowDn, tracker.Data(), y*s.fDnTx, z*s.fDnTx, kAreaSize, kAreaSize );

        do {
          AliHLTTPCCAHit h;
          int i = areaUp.GetNext( tracker, rowUp, tracker.Data(), &h );
          if ( i < 0 ) break;
#if defined(HLTCA_GPUCODE) & kMaxN > ALIHLTTPCCANEIGHBOURS_FINDER_MAX_NNEIGHUP & ALIHLTTPCCANEIGHBOURS_FINDER_MAX_NNEIGHUP > 0
		  if (nNeighUp >= ALIHLTTPCCANEIGHBOURS_FINDER_MAX_NNEIGHUP)
		  {
			neighUp2[nNeighUp - ALIHLTTPCCANEIGHBOURS_FINDER_MAX_NNEIGHUP] = ( unsigned short ) i;
			yzUp2[nNeighUp - ALIHLTTPCCANEIGHBOURS_FINDER_MAX_NNEIGHUP] = CAMath::MakeFloat2( s.fDnDx * ( h.Y() - y ), s.fDnDx * ( h.Z() - z ) );
		  }
		  else
#endif
		  {
			neighUp[nNeighUp] = ( unsigned short ) i;
			yzUp[nNeighUp] = CAMath::MakeFloat2( s.fDnDx * ( h.Y() - y ), s.fDnDx * ( h.Z() - z ) );
		  }
          if ( ++nNeighUp >= kMaxN ) break;
        } while ( 1 );

        int nNeighDn = 0;

        if ( nNeighUp > 0 ) {

          int bestDn = -1, bestUp = -1;
          float bestD = 1.e10;

          do {
            AliHLTTPCCAHit h;
            int i = areaDn.GetNext( tracker, rowDn, tracker.Data(), &h );
            if ( i < 0 ) break;

            nNeighDn++;
            float2 yzdn = CAMath::MakeFloat2( s.fUpDx * ( h.Y() - y ), s.fUpDx * ( h.Z() - z ) );

            for ( int iUp = 0; iUp < nNeighUp; iUp++ ) {
#if defined(HLTCA_GPUCODE) & kMaxN > ALIHLTTPCCANEIGHBOURS_FINDER_MAX_NNEIGHUP & ALIHLTTPCCANEIGHBOURS_FINDER_MAX_NNEIGHUP > 0
			  float2 yzup = iUp >= ALIHLTTPCCANEIGHBOURS_FINDER_MAX_NNEIGHUP ? yzUp2[iUp - ALIHLTTPCCANEIGHBOURS_FINDER_MAX_NNEIGHUP] : yzUp[iUp];
#else
              float2 yzup = yzUp[iUp];
#endif

              float dy = yzdn.x - yzup.x;
              float dz = yzdn.y - yzup.y;
              float d = dy * dy + dz * dz;
              if ( d < bestD ) {
                bestD = d;
                bestDn = i;
                bestUp = iUp;
              }
            }
          } while ( 1 );

          if ( bestD <= chi2Cut ) {
#if defined(HLTCA_GPUCODE) & kMaxN > ALIHLTTPCCANEIGHBOURS_FINDER_MAX_NNEIGHUP & ALIHLTTPCCANEIGHBOURS_FINDER_MAX_NNEIGHUP > 0
			linkUp = bestUp >= ALIHLTTPCCANEIGHBOURS_FINDER_MAX_NNEIGHUP ? neighUp2[bestUp - ALIHLTTPCCANEIGHBOURS_FINDER_MAX_NNEIGHUP] : neighUp[bestUp];
#else
            linkUp = neighUp[bestUp];
#endif
            linkDn = bestDn;
          }
        }
#ifdef DRAW
        std::cout << "n NeighUp = " << nNeighUp << ", n NeighDn = " << nNeighDn << std::endl;
#endif //DRAW
      }

      tracker.SetHitLinkUpData( row, ih, linkUp );
      tracker.SetHitLinkDownData( row, ih, linkDn );
#ifdef DRAW
      std::cout << "Links for row " << s.fIRow << ", hit " << ih << ": " << linkUp << " " << linkDn << std::endl;
      if ( s.fIRow == 22 && ih == 5 ) {
        AliHLTTPCCADisplay::Instance().DrawSliceLink( s.fIRow, ih, -1, -1, 1 );
        AliHLTTPCCADisplay::Instance().DrawSliceHit( s.fIRow, ih, kBlue, 1. );
        AliHLTTPCCADisplay::Instance().Ask();
      }
#endif //DRAW
    }
  }
}
Commit	Line	Data
ce565086	1	// @(#) $Id: AliHLTTPCCANeighboursFinder1.cxx 27042 2008-07-02 12:06:02Z richterm $
ce565086	2	// **************************************************************************
fbb9b71b	3	// This file is property of and copyright by the ALICE HLT Project *
00d07bcd	4	// ALICE Experiment at CERN, All rights reserved. *
	5	// *
	6	// Primary Authors: Sergey Gorbunov <sergey.gorbunov@kip.uni-heidelberg.de> *
	7	// Ivan Kisel <kisel@kip.uni-heidelberg.de> *
	8	// for The ALICE HLT Project. *
	9	// *
	10	// Permission to use, copy, modify and distribute this software and its *
	11	// documentation strictly for non-commercial purposes is hereby granted *
	12	// without fee, provided that the above copyright notice appears in all *
	13	// copies and that both the copyright notice and this permission notice *
	14	// appear in the supporting documentation. The authors make no claims *
	15	// about the suitability of this software for any purpose. It is *
	16	// provided "as is" without express or implied warranty. *
ce565086	17	// *
00d07bcd	18	//***************************************************************************
	19
	20	#include "AliHLTTPCCANeighboursFinder.h"
	21	#include "AliHLTTPCCAMath.h"
	22	#include "AliHLTTPCCAHitArea.h"
	23	#include "AliHLTTPCCATracker.h"
a59a784e	24	#include "AliHLTTPCCAHit.h"
00d07bcd	25
ce565086	26	//#define DRAW
	27
	28	#ifdef DRAW
	29	#include "AliHLTTPCCADisplay.h"
31649d4b	30	#endif //DRAW
ce565086	31
f0bada7f	32	GPUdi() void AliHLTTPCCANeighboursFinder::Thread
fbb9b71b	33	( int /nBlocks/, int nThreads, int iBlock, int iThread, int iSync,
00d07bcd	34	AliHLTTPCCASharedMemory &s, AliHLTTPCCATracker &tracker )
	35	{
	36	//* find neighbours
fbb9b71b	37
fbb9b71b	38	if ( iSync == 0 ) {
b22af1bf	39	#ifdef HLTCA_GPUCODE
	40	for (int i = iThread;i < sizeof(AliHLTTPCCARow) / sizeof(int);i += nThreads)
	41	{
	42	reinterpret_cast<int>(&s.fRow)[i] = reinterpret_cast<int>(&tracker.SliceDataRows()[iBlock])[i];
	43	if (iBlock >= 2 && iBlock <= tracker.Param().NRows() - 3)
	44	{
	45	reinterpret_cast<int>(&s.fRowUp)[i] = reinterpret_cast<int>(&tracker.SliceDataRows()[iBlock + 2])[i];
	46	reinterpret_cast<int>(&s.fRowDown)[i] = reinterpret_cast<int>(&tracker.SliceDataRows()[iBlock - 2])[i];
	47	}
	48	}
	49	__syncthreads();
	50	#endif
fbb9b71b	51	if ( iThread == 0 ) {
	52	s.fNRows = tracker.Param().NRows();
	53	s.fIRow = iBlock;
	54	if ( s.fIRow < s.fNRows ) {
b22af1bf	55	#ifdef HLTCA_GPUCODE
	56	const AliHLTTPCCARow &row = s.fRow;
	57	#else
	58	const AliHLTTPCCARow &row = tracker.Row( s.fIRow );
	59	#endif
fbb9b71b	60	s.fNHits = row.NHits();
fbb9b71b	61
fbb9b71b	62	if ( ( s.fIRow >= 2 ) && ( s.fIRow <= s.fNRows - 3 ) ) {
	63	s.fIRowUp = s.fIRow + 2;
	64	s.fIRowDn = s.fIRow - 2;
4acc2401	65
4acc2401	66	// references to the rows above and below
b22af1bf	67
	68	#ifdef HLTCA_GPUCODE
	69	const AliHLTTPCCARow &rowUp = s.fRowUp;
	70	const AliHLTTPCCARow &rowDn = s.fRowDown;
	71	#else
4acc2401	72	const AliHLTTPCCARow &rowUp = tracker.Row( s.fIRowUp );
4acc2401	73	const AliHLTTPCCARow &rowDn = tracker.Row( s.fIRowDn );
b22af1bf	74	#endif
4acc2401	75	// the axis perpendicular to the rows
	76	const float xDn = rowDn.X();
	77	const float x = row.X();
	78	const float xUp = rowUp.X();
	79
	80	// number of hits in rows above and below
fbb9b71b	81	s.fUpNHits = tracker.Row( s.fIRowUp ).NHits();
4acc2401	82	s.fDnNHits = tracker.Row( s.fIRowDn ).NHits();
	83
	84	// distance of the rows (absolute and relative)
fbb9b71b	85	s.fUpDx = xUp - x;
	86	s.fDnDx = xDn - x;
	87	s.fUpTx = xUp / x;
	88	s.fDnTx = xDn / x;
4acc2401	89	// UpTx/DnTx is used to move the HitArea such that central events are preferred (i.e. vertices
	90	// coming from y = 0, z = 0).
	91
b22af1bf	92	//s.fGridUp = tracker.Row( s.fIRowUp ).Grid();
b22af1bf	93	//s.fGridDn = tracker.Row( s.fIRowDn ).Grid();
fbb9b71b	94	}
00d07bcd	95	}
fbb9b71b	96	}
	97	} else if ( iSync == 1 ) {
	98	if ( s.fIRow < s.fNRows ) {
b22af1bf	99	if ( ( s.fIRow <= 1 ) \|\| ( s.fIRow >= s.fNRows - 2 ) ) {
	100	#ifdef HLTCA_GPUCODE
	101	const AliHLTTPCCARow &row = s.fRow;
	102	#else
	103	const AliHLTTPCCARow &row = tracker.Row( s.fIRow );
	104	#endif
fbb9b71b	105	for ( int ih = iThread; ih < s.fNHits; ih += nThreads ) {
4acc2401	106	tracker.SetHitLinkUpData( row, ih, -1 );
4acc2401	107	tracker.SetHitLinkDownData( row, ih, -1 );
fbb9b71b	108	}
fbb9b71b	109	} else {
b22af1bf	110	/*#ifdef HLTCA_GPUCODE
	111	const AliHLTTPCCARow &rowUp = s.fRowUp;
	112	const AliHLTTPCCARow &rowDn = s.fRowDown;
	113	#else
	114	const AliHLTTPCCARow &rowUp = tracker.Row( s.fIRowUp );
	115	const AliHLTTPCCARow &rowDn = tracker.Row( s.fIRowDn );
	116	#endif
fbb9b71b	117
fbb9b71b	118	for ( unsigned int ih = iThread; ih < s.fGridUp.N() + s.fGridUp.Ny() + 2; ih += nThreads ) {
4acc2401	119	s.fGridContentUp[ih] = tracker.FirstHitInBin( rowUp, ih );
fbb9b71b	120	}
fbb9b71b	121	for ( unsigned int ih = iThread; ih < s.fGridDn.N() + s.fGridDn.Ny() + 2; ih += nThreads ) {
4acc2401	122	s.fGridContentDn[ih] = tracker.FirstHitInBin( rowDn, ih );
b22af1bf	123	}*/
00d07bcd	124	}
00d07bcd	125	}
fbb9b71b	126	} else if ( iSync == 2 ) {
f0bada7f	127
	128	#ifdef HLTCA_GPUCODE
	129	if ( ( iBlock <= 1 ) \|\| ( iBlock >= s.fNRows - 2 ) ) return;
	130	#else
fbb9b71b	131	if ( ( s.fIRow <= 1 ) \|\| ( s.fIRow >= s.fNRows - 2 ) ) return;
f0bada7f	132	#endif
fbb9b71b	133
fbb9b71b	134	float chi2Cut = 3.3.4 * ( s.fUpDx * s.fUpDx + s.fDnDx * s.fDnDx );
f0fb467d	135	const float kAreaSize = tracker.Param().NeighboursSearchArea();
fbb9b71b	136	//float chi2Cut = 3.3.(s.fUpDxs.fUpDx + s.fDnDxs.fDnDx ); //SG
b22af1bf	137	#define kMaxN 20
	138
	139	#ifdef HLTCA_GPUCODE
	140	const AliHLTTPCCARow &row = s.fRow;
	141	const AliHLTTPCCARow &rowUp = s.fRowUp;
	142	const AliHLTTPCCARow &rowDn = s.fRowDown;
	143	#else
	144	const AliHLTTPCCARow &row = tracker.Row( s.fIRow );
	145	const AliHLTTPCCARow &rowUp = tracker.Row( s.fIRowUp );
	146	const AliHLTTPCCARow &rowDn = tracker.Row( s.fIRowDn );
	147	#endif
4acc2401	148	const float y0 = row.Grid().YMin();
	149	const float z0 = row.Grid().ZMin();
	150	const float stepY = row.HstepY();
	151	const float stepZ = row.HstepZ();
fbb9b71b	152
b22af1bf	153	for ( int ih = iThread; ih < s.fNHits; ih += nThreads ) {
fbb9b71b	154
fbb9b71b	155	int linkUp = -1;
	156	int linkDn = -1;
	157
	158	if ( s.fDnNHits > 0 && s.fUpNHits > 0 ) {
	159
31649d4b	160
fbb9b71b	161
4acc2401	162	// coordinates of the hit in the current row
b22af1bf	163	#if defined(HLTCA_GPU_TEXTURE_FETCHa)
f0bada7f	164	ushort2 tmpval = tex1Dfetch(gAliTexRefu2, ((char*) tracker.Data().HitData() - tracker.Data().GPUTextureBase()) / sizeof(ushort2) + row.HitNumberOffset() + ih);
b22af1bf	165	const float y = y0 + tmpval.x * stepY;
	166	const float z = z0 + tmpval.y * stepZ;
	167	#else
4acc2401	168	const float y = y0 + tracker.HitDataY( row, ih ) * stepY;
4acc2401	169	const float z = z0 + tracker.HitDataZ( row, ih ) * stepZ;
b22af1bf	170	#endif
fbb9b71b	171
f0bada7f	172	#if ALIHLTTPCCANEIGHBOURS_FINDER_MAX_NNEIGHUP > 0
31649d4b	173	unsigned short *neighUp = s.fB[iThread];
	174	float2 *yzUp = s.fA[iThread];
	175	#if defined(HLTCA_GPUCODE) & kMaxN > ALIHLTTPCCANEIGHBOURS_FINDER_MAX_NNEIGHUP
	176	unsigned short neighUp2[kMaxN - ALIHLTTPCCANEIGHBOURS_FINDER_MAX_NNEIGHUP];
	177	float2 yzUp2[kMaxN - ALIHLTTPCCANEIGHBOURS_FINDER_MAX_NNEIGHUP];
	178	#endif
f0bada7f	179	#else
	180	unsigned short neighUp[kMaxN];
	181	float2 yzUp[kMaxN];
	182	#endif //ALIHLTTPCCANEIGHBOURS_FINDER_MAX_NNEIGHUP > 0
31649d4b	183
31649d4b	184	int nNeighUp = 0;
fbb9b71b	185	AliHLTTPCCAHitArea areaDn, areaUp;
4acc2401	186	areaUp.Init( rowUp, tracker.Data(), ys.fUpTx, zs.fUpTx, kAreaSize, kAreaSize );
4acc2401	187	areaDn.Init( rowDn, tracker.Data(), ys.fDnTx, zs.fDnTx, kAreaSize, kAreaSize );
fbb9b71b	188
	189	do {
	190	AliHLTTPCCAHit h;
4acc2401	191	int i = areaUp.GetNext( tracker, rowUp, tracker.Data(), &h );
fbb9b71b	192	if ( i < 0 ) break;
f0bada7f	193	#if defined(HLTCA_GPUCODE) & kMaxN > ALIHLTTPCCANEIGHBOURS_FINDER_MAX_NNEIGHUP & ALIHLTTPCCANEIGHBOURS_FINDER_MAX_NNEIGHUP > 0
b22af1bf	194	if (nNeighUp >= ALIHLTTPCCANEIGHBOURS_FINDER_MAX_NNEIGHUP)
	195	{
	196	neighUp2[nNeighUp - ALIHLTTPCCANEIGHBOURS_FINDER_MAX_NNEIGHUP] = ( unsigned short ) i;
	197	yzUp2[nNeighUp - ALIHLTTPCCANEIGHBOURS_FINDER_MAX_NNEIGHUP] = CAMath::MakeFloat2( s.fDnDx * ( h.Y() - y ), s.fDnDx * ( h.Z() - z ) );
	198	}
	199	else
	200	#endif
	201	{
	202	neighUp[nNeighUp] = ( unsigned short ) i;
	203	yzUp[nNeighUp] = CAMath::MakeFloat2( s.fDnDx * ( h.Y() - y ), s.fDnDx * ( h.Z() - z ) );
	204	}
fbb9b71b	205	if ( ++nNeighUp >= kMaxN ) break;
	206	} while ( 1 );
	207
	208	int nNeighDn = 0;
	209
	210	if ( nNeighUp > 0 ) {
	211
	212	int bestDn = -1, bestUp = -1;
	213	float bestD = 1.e10;
	214
	215	do {
	216	AliHLTTPCCAHit h;
4acc2401	217	int i = areaDn.GetNext( tracker, rowDn, tracker.Data(), &h );
fbb9b71b	218	if ( i < 0 ) break;
	219
	220	nNeighDn++;
	221	float2 yzdn = CAMath::MakeFloat2( s.fUpDx * ( h.Y() - y ), s.fUpDx * ( h.Z() - z ) );
	222
	223	for ( int iUp = 0; iUp < nNeighUp; iUp++ ) {
f0bada7f	224	#if defined(HLTCA_GPUCODE) & kMaxN > ALIHLTTPCCANEIGHBOURS_FINDER_MAX_NNEIGHUP & ALIHLTTPCCANEIGHBOURS_FINDER_MAX_NNEIGHUP > 0
b22af1bf	225	float2 yzup = iUp >= ALIHLTTPCCANEIGHBOURS_FINDER_MAX_NNEIGHUP ? yzUp2[iUp - ALIHLTTPCCANEIGHBOURS_FINDER_MAX_NNEIGHUP] : yzUp[iUp];
b22af1bf	226	#else
fbb9b71b	227	float2 yzup = yzUp[iUp];
b22af1bf	228	#endif
b22af1bf	229
fbb9b71b	230	float dy = yzdn.x - yzup.x;
	231	float dz = yzdn.y - yzup.y;
	232	float d = dy * dy + dz * dz;
	233	if ( d < bestD ) {
	234	bestD = d;
	235	bestDn = i;
	236	bestUp = iUp;
	237	}
	238	}
	239	} while ( 1 );
	240
	241	if ( bestD <= chi2Cut ) {
f0bada7f	242	#if defined(HLTCA_GPUCODE) & kMaxN > ALIHLTTPCCANEIGHBOURS_FINDER_MAX_NNEIGHUP & ALIHLTTPCCANEIGHBOURS_FINDER_MAX_NNEIGHUP > 0
b22af1bf	243	linkUp = bestUp >= ALIHLTTPCCANEIGHBOURS_FINDER_MAX_NNEIGHUP ? neighUp2[bestUp - ALIHLTTPCCANEIGHBOURS_FINDER_MAX_NNEIGHUP] : neighUp[bestUp];
b22af1bf	244	#else
fbb9b71b	245	linkUp = neighUp[bestUp];
b22af1bf	246	#endif
fbb9b71b	247	linkDn = bestDn;
	248	}
	249	}
ce565086	250	#ifdef DRAW
fbb9b71b	251	std::cout << "n NeighUp = " << nNeighUp << ", n NeighDn = " << nNeighDn << std::endl;
31649d4b	252	#endif //DRAW
fbb9b71b	253	}
fbb9b71b	254
4acc2401	255	tracker.SetHitLinkUpData( row, ih, linkUp );
4acc2401	256	tracker.SetHitLinkDownData( row, ih, linkDn );
ce565086	257	#ifdef DRAW
fbb9b71b	258	std::cout << "Links for row " << s.fIRow << ", hit " << ih << ": " << linkUp << " " << linkDn << std::endl;
	259	if ( s.fIRow == 22 && ih == 5 ) {
	260	AliHLTTPCCADisplay::Instance().DrawSliceLink( s.fIRow, ih, -1, -1, 1 );
	261	AliHLTTPCCADisplay::Instance().DrawSliceHit( s.fIRow, ih, kBlue, 1. );
	262	AliHLTTPCCADisplay::Instance().Ask();
00d07bcd	263	}
31649d4b	264	#endif //DRAW
00d07bcd	265	}
fbb9b71b	266	}
00d07bcd	267	}
00d07bcd	268