Adapt tracker to work with 8 layers for ITS3 (#11234)

CI failure unrelated, merging.

Author: fgrosa

Detectors/ITSMFT/ITS/tracking/CMakeLists.txt

@@ -9,6 +9,13 @@
 # granted to it by virtue of its status as an Intergovernmental Organization
 # or submit itself to any jurisdiction.
 
+# see if its3 4-layer tracking option is enabled
+option(ENABLE_ITS3_4L "Enable its3 4-layer tracking option" OFF)
+if (ENABLE_ITS3_4L)
+  MESSAGE(STATUS "Enable its3 4-layer tracking option")
+  add_definitions(-DENABLE_ITS3_4L)
+endif()
+
 o2_add_library(ITStracking
                TARGETVARNAME targetName
                SOURCES src/ClusterLines.cxx

Detectors/ITSMFT/ITS/tracking/include/ITStracking/IndexTableUtils.h

@@ -48,8 +48,8 @@ class IndexTableUtils
   int mNzBins = 0;
   int mNphiBins = 0;
   float mInversePhiBinSize = 0.f;
-  float mLayerZ[7] = {0.f, 0.f, 0.f, 0.f, 0.f, 0.f, 0.f};
-  float mInverseZBinSize[7] = {0.f, 0.f, 0.f, 0.f, 0.f, 0.f, 0.f};
+  float mLayerZ[8] = {0.f, 0.f, 0.f, 0.f, 0.f, 0.f, 0.f, 0.f};
+  float mInverseZBinSize[8] = {0.f, 0.f, 0.f, 0.f, 0.f, 0.f, 0.f, 0.f};
 };
 
 template <class T>

Detectors/ITSMFT/ITS/tracking/include/ITStracking/Road.h

@@ -60,7 +60,11 @@ class Road final
   }
 
  private:
+#ifndef ENABLE_ITS3_4L
   int mCellIds[maxRoadSize];
+#else
+  int mCellIds[maxRoadSize + 1];
+#endif
   // int mLabel;
   unsigned char mRoadSize;
   bool mIsFakeRoad;

Detectors/ITSMFT/ITS/tracking/include/ITStracking/TimeFrame.h

@@ -202,6 +202,8 @@ class TimeFrame
   void addTrackingFrameInfoToLayer(int layer, T&&... args);
   void addClusterExternalIndexToLayer(int layer, const int idx);
 
+  void resizeVectors(int nLayers);
+
   /// Debug and printing
   void checkTrackletLUTs();
   void printROFoffsets();

Detectors/ITSMFT/ITS/tracking/include/ITStracking/TrackerTraits.h

@@ -136,7 +136,7 @@ inline const int4 TrackerTraits::getBinsRect(const Cluster& currentCluster, int
 
 inline void TrackerTraits::initialiseTimeFrame(const int iteration)
 {
-  mTimeFrame->initialise(iteration, mTrkParams[iteration], 7);
+  mTimeFrame->initialise(iteration, mTrkParams[iteration], mTrkParams[iteration].NLayers);
   setIsGPU(false);
 }
 

Detectors/ITSMFT/ITS/tracking/src/TimeFrame.cxx

@@ -455,6 +455,20 @@ void TimeFrame::checkTrackletLUTs()
   }
 }
 
+void TimeFrame::resizeVectors(int nLayers)
+{
+  mMinR.resize(nLayers, 10000.);
+  mMaxR.resize(nLayers, -1.);
+  mClusters.resize(nLayers);
+  mUnsortedClusters.resize(nLayers);
+  mTrackingFrameInfo.resize(nLayers);
+  mClusterExternalIndices.resize(nLayers);
+  mUsedClusters.resize(nLayers);
+  mROframesClusters.resize(nLayers, {0});
+  mNClustersPerROF.resize(nLayers);
+  mTrackletsIndexROf.resize(2, {0});
+}
+
 void TimeFrame::printTrackletLUTonLayer(int i)
 {
   std::cout << "--------" << std::endl