// 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.

/// \file GPUTPCRow.h

/// \author Sergey Gorbunov, Ivan Kisel, David Rohr

#ifndef GPUTPCROW_H

#define GPUTPCROW_H

#include "GPUTPCDef.h"

#include "GPUTPCGrid.h"

namespace o2::gpu

{

/**

* @class GPUTPCRow

*

* The GPUTPCRow class is a hit and cells container for one TPC row.

* It is the internal class of the GPUTPCTracker algorithm.

*

*/

class GPUTPCRow

{

friend class GPUTPCTrackingData;

public:

GPUhd() uint32_t NHits() const

{

return mNHits;

}

GPUhd() float X() const { return mX; }

GPUhd() float MaxY() const { return mMaxY; }

GPUhd() const GPUTPCGrid& Grid() const { return mGrid; }

GPUhd() float Hy0() const { return mHy0; }

GPUhd() float Hz0() const { return mHz0; }

GPUhd() float HstepY() const { return mHstepY; }

GPUhd() float HstepZ() const { return mHstepZ; }

GPUhd() float HstepYi() const { return mHstepYi; }

GPUhd() float HstepZi() const { return mHstepZi; }

GPUhd() uint32_t HitNumberOffset() const { return mHitNumberOffset; }

GPUhd() uint32_t FirstHitInBinOffset() const { return mFirstHitInBinOffset; }

GPUhd() static float getTPCMaxY1X() { return 0.1763269f; } // 0.1763269 = tan(2Pi / (2 * 18))

GPUhd() float getTPCMaxY() const { return getTPCMaxY1X() * mX; }

private:

friend class GPUTPCNeighboursFinder;

friend class GPUTPCStartHitsFinder;

uint32_t mNHits; // number of hits

float mX; // X coordinate of the row

float mMaxY; // maximal Y coordinate of the row

GPUTPCGrid mGrid; // grid of hits

// hit packing:

float mHy0; // offset

float mHz0; // offset

float mHstepY; // step size

float mHstepZ; // step size

float mHstepYi; // inverse step size

float mHstepZi; // inverse step size

uint32_t mHitNumberOffset; // index of the first hit in the hit array, used as offset in GPUTPCTrackingData::LinkUp/DownData/HitDataY/...

uint32_t mFirstHitInBinOffset; // offset in Tracker::mRowData to find the FirstHitInBin

};

} // namespace o2::gpu

#endif // GPUTPCROW_H