LUCID_DigitByteStreamCnv Class Reference

#include <LUCID_DigitByteStreamCnv.h>

Inheritance diagram for LUCID_DigitByteStreamCnv:

Collaboration diagram for LUCID_DigitByteStreamCnv:

Public Member Functions
	LUCID_DigitByteStreamCnv (ISvcLocator *svcloc)
virtual StatusCode	initialize () override
virtual StatusCode	createRep (DataObject *pObj, IOpaqueAddress *&pAddr) override
virtual long	repSvcType () const override
StatusCode	fillFEA (LUCID_DigitContainer *RDO_container, RawEventWrite *re)
unsigned short	RodBlockVersion (void)
int	BCs_per_LVL1ID (void)
unsigned int	getSourceID ()
void	addTrack (TIDA::Track *t)
const std::vector< TIDA::Track * > &	tracks () const
void	clear ()
void	selectTracks (const TrigInDetTrackCollection *trigtracks)
void	selectTracks (const Rec::TrackParticleContainer *trigtracks)
void	selectTracks (const Analysis::MuonContainer *muontracks)
bool	msgLvl (const MSG::Level lvl) const
	Test the output level. More...
MsgStream &	msg () const
	The standard message stream. More...
MsgStream &	msg (const MSG::Level lvl) const
	The standard message stream. More...
void	setLevel (MSG::Level lvl)
	Change the current logging level. More...

Static Public Member Functions
static long	storageType ()
static const CLID &	classID ()

Protected Member Functions
double	phiCorr (double phi)
void	ipCorr (double d0, double z0, double &d0c, double &z0c, double phi0, double eta, double pt)

Protected Attributes
double	m_beamX
double	m_beamY
double	m_beamZ
std::vector< TIDA::Track * >	m_tracks

Private Member Functions
void	initMessaging () const
	Initialize our message level and MessageSvc. More...

Private Attributes
IByteStreamEventAccess *	m_ByteStreamEventAccess
StoreGateSvc *	m_StoreGate
FullEventAssembler< SrcIdMap >	m_fea
unsigned short	m_RodBlockVersion
int	m_BCs_per_LVL1ID
std::string	m_nm
	Message source name. More...
boost::thread_specific_ptr< MsgStream >	m_msg_tls
	MsgStream instance (a std::cout like with print-out levels) More...
std::atomic< IMessageSvc * >	m_imsg { nullptr }
	MessageSvc pointer. More...
std::atomic< MSG::Level >	m_lvl { MSG::NIL }
	Current logging level. More...
std::atomic_flag m_initialized	ATLAS_THREAD_SAFE = ATOMIC_FLAG_INIT
	Messaging initialized (initMessaging) More...

Detailed Description

Definition at line 31 of file LUCID_DigitByteStreamCnv.h.

Constructor & Destructor Documentation

LUCID_DigitByteStreamCnv()

LUCID_DigitByteStreamCnv::LUCID_DigitByteStreamCnv

(

ISvcLocator *

svcloc

)

Definition at line 20 of file LUCID_DigitByteStreamCnv.cxx.

                                                                      : 
  Converter(storageType(), classID(), svcloc),
  AthMessaging("LUCID_DigitByteStreamCnv"),
  m_RodBlockVersion      (0),
  m_BCs_per_LVL1ID       (1)
{
  m_ByteStreamEventAccess = nullptr;
  m_StoreGate             = nullptr;
}

Member Function Documentation

addTrack()

void Converter::addTrack ( TIDA::Track *  t )

inlineinherited

Definition at line 45 of file Converter.h.

                              {
    m_tracks.push_back(t);
  }

BCs_per_LVL1ID()

int LUCID_DigitByteStreamCnv::BCs_per_LVL1ID ( void  )

inline

Definition at line 49 of file LUCID_DigitByteStreamCnv.h.

{ return m_BCs_per_LVL1ID; }

classID()

const CLID & LUCID_DigitByteStreamCnv::classID ( )

static

Definition at line 38 of file LUCID_DigitByteStreamCnv.cxx.

                                              {
 
  return ClassID_traits<LUCID_DigitContainer>::ID();
}

clear()

void Converter::clear ( )

inlineinherited

Definition at line 53 of file Converter.h.

{m_tracks.clear();} 

createRep()

StatusCode LUCID_DigitByteStreamCnv::createRep ( DataObject *  pObj, IOpaqueAddress *&  pAddr  )

overridevirtual

Definition at line 48 of file LUCID_DigitByteStreamCnv.cxx.

                                                                                       {
  
   ATH_MSG_DEBUG(" LUCID_DigitByteStreamCnv::createRep");
 
   RawEventWrite*        re = m_ByteStreamEventAccess->getRawEvent();
   LUCID_DigitContainer* RDO_container = nullptr;
 
   // dynamic cast of the pObj to RDO_container based in clid of pObj
   if (!SG::fromStorable(pObj, RDO_container)) {
     ATH_MSG_ERROR("Can not cast to LUCID_DigitContainer");
     return StatusCode::RECOVERABLE;
   }
 
// get name of the persistent object (pObj)
   std::string nm = pObj->registry()->name();
 
// and create a empty generic BytestreamAddress  for the specific clid of pObj
   ByteStreamAddress* addr = new ByteStreamAddress(classID(), nm, "");
 
   pAddr = addr;
 
   StatusCode sc = fillFEA(RDO_container, re);
   
   if (sc.isFailure()){
     ATH_MSG_ERROR(" Could not convert RawData with to ByteStream ");
     return StatusCode::RECOVERABLE;
   }
 
  return StatusCode::SUCCESS;
}

fillFEA()

StatusCode LUCID_DigitByteStreamCnv::fillFEA	(	LUCID_DigitContainer *	RDO_container,
		RawEventWrite *	re
	)

Definition at line 79 of file LUCID_DigitByteStreamCnv.cxx.

                                                                                                  {
 
  m_fea.clear(); 
  // type of RODDATA is std::vector<uint32_t> 
  FullEventAssembler<SrcIdMap>::RODDATA* theROD;
 
  m_fea.setRodMinorVersion(RodBlockVersion());
  ATH_MSG_DEBUG("Setting ROD Minor Version Number to: " << m_RodBlockVersion);
 
  LucidRodEncoder_map RDOEncoder_map;
 
  LUCID_DigitContainer::const_iterator it_cont     = RDO_container->begin(); 
  LUCID_DigitContainer::const_iterator it_cont_end = RDO_container->end();
  LUCID_RodEncoder::Cache cache{};
  for( ; it_cont != it_cont_end; ++it_cont) {
    
    if ((*it_cont) != nullptr) {
 
      uint32_t rodId = getSourceID();
      
      RDOEncoder_map[rodId].addDigit((*it_cont),cache);
    } 
    else ATH_MSG_WARNING(" Digit is empty, skipping digit.");
  }
 
  LucidRodEncoder_map::iterator it_map     = RDOEncoder_map.begin();
  LucidRodEncoder_map::iterator it_map_end = RDOEncoder_map.end();
  
  for (; it_map != it_map_end; ++it_map) { 
 
    // (*it_map) is now a pointer of the type std::pair<const uint32_t, LUCID_RDOEncoder >
    
    theROD = m_fea.getRodData((*it_map).first);
 
    ((*it_map).second).encode(*theROD, cache, msg());
 
    (*theROD).push_back(0); // add status word
  
    LUCID_RawData lrd(*theROD);
    
    lrd.encodeLumatMapping();
    
    *theROD = lrd.getDataBlock();
  }
  
  m_fea.fill(re, msg(MSG::INFO)); 
  
  return StatusCode::SUCCESS;
}

getSourceID()

unsigned int LUCID_DigitByteStreamCnv::getSourceID ( )

inline

Definition at line 51 of file LUCID_DigitByteStreamCnv.h.

{ return 0x00820000; }

initialize()

StatusCode LUCID_DigitByteStreamCnv::initialize ( )

overridevirtual

Definition at line 30 of file LUCID_DigitByteStreamCnv.cxx.

                                                {
 
  ATH_CHECK( Converter::initialize() );
  ATH_CHECK( service("ByteStreamCnvSvc", m_ByteStreamEventAccess) );
    
  return StatusCode::SUCCESS;
}

initMessaging()

void AthMessaging::initMessaging ( ) const

privateinherited

Initialize our message level and MessageSvc.

This method should only be called once.

Definition at line 39 of file AthMessaging.cxx.

{
  m_imsg = Athena::getMessageSvc();
  m_lvl = m_imsg ?
    static_cast<MSG::Level>( m_imsg.load()->outputLevel(m_nm) ) :
    MSG::INFO;
}

ipCorr()

void Converter::ipCorr ( double  d0, double  z0, double &  d0c, double &  z0c, double  phi0, double  eta, double  pt  )

inlineprotectedinherited

Definition at line 257 of file Converter.h.

                                                                                                  {
    
    double sn  = sin(phi0);
    double cs  = cos(phi0);
    double sd0 = (d0 != 0 ? d0/fabs(d0) : 1);
    double spt = (pt != 0 ? pt/fabs(pt) : 1);
    
    if (fabs(pt) >= 1*CLHEP::TeV) {
 
      d0c = d0 + m_beamX*sn - m_beamY*cs;
 
    } else {
      
      double rc = fabs(pt)*15.0/(9.0*1.042);
      
      double xc = (fabs(d0)-spt*sd0*rc)*cos(phi0+M_PI/2*sd0) - m_beamX;
      double yc = (fabs(d0)-spt*sd0*rc)*sin(phi0+M_PI/2*sd0) - m_beamY;
      
      double newphi;
      double xd01,yd01,xd02,yd02;
      
      if (xc == 0) {
    xd01 = 0; yd01 = rc+yc;
    xd02 = 0; yd02 = -rc+yc; 
      } else {
    xd01 = xc+yc/xc*yc+sqrt(pow((xc+yc/xc*yc),2)-xc*xc-yc*yc+rc*rc); yd01 = yc/xc*xd01;
    xd02 = xc+yc/xc*yc-sqrt(pow((xc+yc/xc*yc),2)-xc*xc-yc*yc+rc*rc); yd02 = yc/xc*xd02;
      }
      
      double r1 = sqrt(xd01*xd01+yd01*yd01);
      double r2 = sqrt(xd02*xd02+yd02*yd02);
      
      double phiV;
      
      if (r1 < r2)
    phiV = atan2(yd01,xd01); 
      else
    phiV = atan2(yd02,xd02); 
      
      double phi1 = phiCorr(phiV+M_PI/2);
      double phi2 = phiCorr(phiV-M_PI/2);
      
      if (fabs(phiCorr(phi1-phi0))<=fabs(phiCorr(phi2-phi0)))
    newphi = phi1;
      else
    newphi = phi2;
      
      d0c = fabs(sqrt(xc*xc+yc*yc)-rc)*sin(phiV-newphi);
      
      double theta=2*atan2(exp(-eta),1);
      double theta_save=theta;
      theta = theta - (1+spt)/2*M_PI;
      if (theta>0) theta = theta_save;
      
      double deltaz0= -spt*rc/tan(theta)*phiCorr(phiCorr(newphi)-phiCorr(phi0));
      z0c = z0 + deltaz0;
      
    }
  }

msg() [1/2]

MsgStream & AthMessaging::msg ( ) const

inlineinherited

The standard message stream.

Returns a reference to the default message stream May not be invoked before sysInitialize() has been invoked.

Definition at line 164 of file AthMessaging.h.

{
  MsgStream* ms = m_msg_tls.get();
  if (!ms) {
    if (!m_initialized.test_and_set()) initMessaging();
    ms = new MsgStream(m_imsg,m_nm);
    m_msg_tls.reset( ms );
  }
 
  ms->setLevel (m_lvl);
  return *ms;
}

msg() [2/2]

MsgStream & AthMessaging::msg ( const MSG::Level  lvl ) const

inlineinherited

The standard message stream.

Returns a reference to the default message stream May not be invoked before sysInitialize() has been invoked.

Definition at line 179 of file AthMessaging.h.

{ return msg() << lvl; }

msgLvl()

bool AthMessaging::msgLvl ( const MSG::Level  lvl ) const

inlineinherited

Test the output level.

Parameters

lvl	The message level to test against

Returns

boolean Indicating if messages at given level will be printed

Return values

true	Messages at level "lvl" will be printed

Definition at line 151 of file AthMessaging.h.

{
  if (!m_initialized.test_and_set()) initMessaging();
  if (m_lvl <= lvl) {
    msg() << lvl;
    return true;
  } else {
    return false;
  }
}

phiCorr()

double Converter::phiCorr ( double  phi )

inlineprotectedinherited

Definition at line 248 of file Converter.h.

                            {
    
    if (phi < -TMath::Pi()) phi += 2*TMath::Pi();
    if (phi >  TMath::Pi()) phi -= 2*TMath::Pi();
    
    return phi;
  }

repSvcType()

virtual long LUCID_DigitByteStreamCnv::repSvcType ( ) const

inlineoverridevirtual

Definition at line 42 of file LUCID_DigitByteStreamCnv.h.

{ return i_repSvcType(); }

RodBlockVersion()

unsigned short LUCID_DigitByteStreamCnv::RodBlockVersion ( void  )

inline

Definition at line 48 of file LUCID_DigitByteStreamCnv.h.

{ return m_RodBlockVersion; }

selectTracks() [1/3]

void Converter::selectTracks ( const Analysis::MuonContainer *  muontracks )

inlineinherited

Definition at line 177 of file Converter.h.

                                                               {
    
    static int hpmap[20] = { 0, 1, 2,  7, 8, 9,  3, 4, 5, 6, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19 };
    
    Analysis::MuonContainer::const_iterator muonitr = muontracks->begin();
    Analysis::MuonContainer::const_iterator muonend = muontracks->end();
    
    while(muonitr!=muonend) { 
      
      bool hasInDet = (*muonitr)->hasInDetTrackParticle();
      const Rec::TrackParticle *trackitr=NULL; 
      if(hasInDet) trackitr=(*muonitr)->inDetTrackParticle();
      muonitr++;
      if(!hasInDet) continue;
      
      const Trk::MeasuredPerigee* measPer = trackitr->measuredPerigee();
      
      CLHEP::HepVector perigeeParams = measPer->parameters();    
      double pT    = measPer->pT(); 
      double eta   = measPer->eta();
      double phi   = perigeeParams[Trk::phi0];
      double z0    = perigeeParams[Trk::z0];
      double d0    = perigeeParams[Trk::d0];
      //double theta = perigeeParams[Trk::theta];
      
      double deta = 1;
      double dphi = 1;
      double dz0  = 1;
      double dd0  = 1;
      double dpT  = 1;    
      
      // Check number of hits
      // NB: a spacepoint is two offline "hits", so a pixel spacepoint is really 
      // 2 "hits" and an offline SCT "hit" is really a 1D cluster, so two intersetcting
      // stereo clusters making a spacepoint are two "hits"
      const Trk::TrackSummary *summary = trackitr->trackSummary();
      int nBlayerHits = 2*summary->get(Trk::numberOfBLayerHits); 
      int nPixelHits  = 2*summary->get(Trk::numberOfPixelHits);  
      int nSctHits    = summary->get(Trk::numberOfSCTHits); 
      int nStrawHits  = summary->get(Trk::numberOfTRTHits);
      int nTrHits     = summary->get(Trk::numberOfTRTHighThresholdHits);
      
      int nSiHits     = nPixelHits + nSctHits;
      
      const Trk::FitQuality *quality   = trackitr->fitQuality();
      double chi2 = quality->chiSquared();
      double dof  = quality->quality->numberDoF();
 
      unsigned bitmap = 0;
      
      for ( int ih=0 ; ih<20 ; ih++ ) {
    if ( summary->isHit(Trk::DetectorType(ih)) ) bitmap |= ( 1<<hpmap[ih] );    
      }
      
      // Shift d0 and z0 according to beam position
      ipCorr(d0, z0, d0, z0, phi, eta, pT);
      
      // Create and save Track  
      TIDA::Track* t = new TIDA::Track(eta, phi, z0, d0, pT, chi2, dof,
                                 deta, dphi, dz0, dd0, dpT,
                                 nBlayerHits, nPixelHits, nSctHits, nSiHits,
                                 nStrawHits, nTrHits, bitmap, 0,
                                 -1) ;
      
      addTrack(t);
    }
    
  }

selectTracks() [2/3]

void Converter::selectTracks ( const Rec::TrackParticleContainer *  trigtracks )

inlineinherited

Definition at line 111 of file Converter.h.

                                                                   { 
    
    Rec::TrackParticleContainer::const_iterator  trackitr = trigtracks->begin();
    Rec::TrackParticleContainer::const_iterator  trackend = trigtracks->end();
    
    static int hpmap[20] = { 0, 1, 2,  7, 8, 9,  3, 4, 5, 6, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19 };
 
    while ( trackitr!=trackend ) { 
        
      const Trk::MeasuredPerigee* measPer = (*trackitr)->measuredPerigee();
 
      CLHEP::HepVector perigeeParams = measPer->parameters();    
      double pT    = measPer->pT(); 
      double eta   = measPer->eta();
      double phi   = perigeeParams[Trk::phi0];
      double z0    = perigeeParams[Trk::z0];
      double d0    = perigeeParams[Trk::d0];
      //double theta = perigeeParams[Trk::theta];
    
      double deta = 1;
      double dphi = 1;
      double dz0  = 1;
      double dd0  = 1;
      double dpT  = 1;    
 
      // Check number of hits
      // NB: a spacepoint is two offline "hits", so a pixel spacepoint is really 
      // 2 "hits" and an offline SCT "hit" is really a 1D cluster, so two intersetcting
      // stereo clusters making a spacepoint are two "hits"
      const Trk::TrackSummary *summary = (*trackitr)->trackSummary();
      int nBlayerHits = 2*summary->get(Trk::numberOfBLayerHits); 
      int nPixelHits  = 2*summary->get(Trk::numberOfPixelHits);  
      int nSctHits    = summary->get(Trk::numberOfSCTHits); 
      int nStrawHits  = summary->get(Trk::numberOfTRTHits);
      int nTrHits     = summary->get(Trk::numberOfTRTHighThresholdHits);
      int nSiHits     = nPixelHits + nSctHits;
      bool expectBL   = false; // Not stored for Rec::TrackParticle
 
      const Trk::FitQuality *quality   = (*trackitr)->fitQuality();
      double chi2 = quality->chiSquared();
      double dof  = quality->numberDoF();
 
      unsigned bitmap = 0;
      
      for ( int ih=0 ; ih<20 ; ih++ ) {
    if ( summary->isHit(Trk::DetectorType(ih)) ) bitmap |= ( 1<<hpmap[ih] );    
      }
 
      // Shift d0 and z0 according to beam position
      ipCorr(d0, z0, d0, z0, phi, eta, pT);
 
      // Create and save Track  
      TIDA::Track* t = new TIDA::Track(eta, phi, z0, d0, pT, chi2, dof, 
                                 deta, dphi, dz0, dd0, dpT,
                                 nBlayerHits, nPixelHits, nSctHits, nSiHits,
                                 nStrawHits, nTrHits, bitmap, 0,
                                 -1,
                                 expectBL) ;
  
      addTrack(t);
      trackitr++;
    }
    
  }

selectTracks() [3/3]

void Converter::selectTracks ( const TrigInDetTrackCollection *  trigtracks )

inlineinherited

Definition at line 56 of file Converter.h.

                                                                {
    
    TrigInDetTrackCollection::const_iterator  trackitr = trigtracks->begin();
    TrigInDetTrackCollection::const_iterator  trackend = trigtracks->end();
 
    while ( trackitr!=trackend ) { 
 
    double eta    = (*trackitr)->param()->eta();
    double phi    = (*trackitr)->param()->phi0();
    double z0     = (*trackitr)->param()->z0(); 
    double pT     = (*trackitr)->param()->pT(); 
    double d0     = (*trackitr)->param()->a0();
    //double theta  = 2*atan2(exp(-(*trackitr)->param()->eta()),1);
 
    double deta    = (*trackitr)->param()->eeta();
    double dphi    = (*trackitr)->param()->ephi0();
    double dz0     = (*trackitr)->param()->ez0(); 
    double dpT     = (*trackitr)->param()->epT(); 
    double dd0     = (*trackitr)->param()->ea0();
 
    int   algoid  = (*trackitr)->algorithmId();           
 
    int nBlayerHits = ((*trackitr)->HitPattern() & 0x1);
    int nPixelHits  = 2*(*trackitr)->NPixelSpacePoints();  // NB: for comparison with offline 
    int nSctHits    = 2*(*trackitr)->NSCT_SpacePoints();   //     a spacepoint is 2 "hits"
    int nStrawHits  = (*trackitr)->NStrawHits();
    int nTrHits     = (*trackitr)->NTRHits();
               
    int nSiHits     = nPixelHits + nSctHits;
    bool expectBL   = false;                               //not available with TrigInDetTrack
 
    unsigned hitPattern = (*trackitr)->HitPattern();
    unsigned multiPattern = 0;
 
    double chi2    = (*trackitr)->chi2();
    double dof     = 0;
 
    // Shift d0 and z0 according to beam position
    ipCorr(d0, z0, d0, z0, phi, eta, pT);
    
    // Create and save Track  
    TIDA::Track* t = new TIDA::Track(eta,  phi,  z0,  d0,  pT, chi2, dof, 
                                   deta, dphi, dz0, dd0, dpT, 
                                   nBlayerHits, nPixelHits, nSctHits, nSiHits, 
                                   nStrawHits, nTrHits, hitPattern, multiPattern, 
                                   algoid,
                                   expectBL ) ; 
 
    addTrack(t);
    trackitr++; 
    }
  }

setLevel()

void AthMessaging::setLevel ( MSG::Level  lvl )

inherited

Change the current logging level.

Use this rather than msg().setLevel() for proper operation with MT.

Definition at line 28 of file AthMessaging.cxx.

{
  m_lvl = lvl;
}

storageType()

long LUCID_DigitByteStreamCnv::storageType ( )

static

Definition at line 43 of file LUCID_DigitByteStreamCnv.cxx.

                                           {
 
  return ByteStreamAddress::storageType();
}

tracks()

const std::vector<TIDA::Track*>& Converter::tracks ( ) const

inlineinherited

Definition at line 50 of file Converter.h.

{return m_tracks;}

Member Data Documentation

ATLAS_THREAD_SAFE

std::atomic_flag m_initialized AthMessaging::ATLAS_THREAD_SAFE = ATOMIC_FLAG_INIT

mutableprivateinherited

Messaging initialized (initMessaging)

Definition at line 141 of file AthMessaging.h.

m_BCs_per_LVL1ID

int LUCID_DigitByteStreamCnv::m_BCs_per_LVL1ID

private

Definition at line 60 of file LUCID_DigitByteStreamCnv.h.

m_beamX

double Converter::m_beamX

protectedinherited

Definition at line 320 of file Converter.h.

m_beamY

double Converter::m_beamY

protectedinherited

Definition at line 320 of file Converter.h.

m_beamZ

double Converter::m_beamZ

protectedinherited

Definition at line 320 of file Converter.h.

m_ByteStreamEventAccess

IByteStreamEventAccess* LUCID_DigitByteStreamCnv::m_ByteStreamEventAccess

private

Definition at line 55 of file LUCID_DigitByteStreamCnv.h.

m_fea

FullEventAssembler<SrcIdMap> LUCID_DigitByteStreamCnv::m_fea

private

Definition at line 58 of file LUCID_DigitByteStreamCnv.h.

m_imsg

std::atomic<IMessageSvc*> AthMessaging::m_imsg { nullptr }

mutableprivateinherited

MessageSvc pointer.

Definition at line 135 of file AthMessaging.h.

m_lvl

std::atomic<MSG::Level> AthMessaging::m_lvl { MSG::NIL }

mutableprivateinherited

Current logging level.

Definition at line 138 of file AthMessaging.h.

m_msg_tls

boost::thread_specific_ptr<MsgStream> AthMessaging::m_msg_tls

mutableprivateinherited

MsgStream instance (a std::cout like with print-out levels)

Definition at line 132 of file AthMessaging.h.

m_nm

std::string AthMessaging::m_nm

privateinherited

Message source name.

Definition at line 129 of file AthMessaging.h.

m_RodBlockVersion

unsigned short LUCID_DigitByteStreamCnv::m_RodBlockVersion

private

Definition at line 59 of file LUCID_DigitByteStreamCnv.h.

m_StoreGate

StoreGateSvc* LUCID_DigitByteStreamCnv::m_StoreGate

private

Definition at line 56 of file LUCID_DigitByteStreamCnv.h.

m_tracks

std::vector<TIDA::Track*> Converter::m_tracks

protectedinherited

Definition at line 321 of file Converter.h.

---

The documentation for this class was generated from the following files:

• LUCID_DigitByteStreamCnv.h
• LUCID_DigitByteStreamCnv.cxx