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track_vr.H

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#ifndef GLUE_BUT_TRACK_H
#define GLUE_BUT_TRACK_H

#include "event/event.H"
#include "dev/dev.H"
#include "dev/room6d.H"
#include "dev/buttons.H"

extern DllImpExp cWtransf &Identity;

class DEVtracker_agg: public EVENTfilter {
     str_ptr        _hname, _tname;
     DEVice_room6d *_head;
     DEVice        *_tkr;    // possible real source of tracker events
     EVENTsource    _tkr_src;// cached description of tracker event source
            
     bool     tracker_evt(cEVENTptr &evt) { 
           if (!_tkr && !(_tkr = DEVice::lookup(_tname)) && evt->debug_on())
          cerr <<"DEVtracker_agg: can't find tracker device "
               << _tname << endl;
           return _tkr_src.test(*evt->source()) && EVENTroom6d::isa(evt); }
     cWtransf &cur_head(bool dbg) { 
               if (!_head&&!(_head=(DEVice_room6d*)DEVice::lookup(_hname))&&dbg)
              cerr << "DEVtracker_agg: can't find head device "
               << _hname << endl; 
           return _head ? _head->cur() : Identity; }
   public:
      DEVtracker_agg(Cstr_ptr &h, Cstr_ptr &t): _hname(h), _tname(t),
             _head(0), _tkr(0), _tkr_src(_tname,0) { }

      EVENTptr filter(cEVENTptr &evt) {
     if (tracker_evt(evt)) {
        EVENTroom6dptr track = EVENTroom6d::cast(evt);
            return new EVENTroom6d_vr(track->source(), 
                                      track->old(),
                                      track->cur(),cur_head(evt->debug_on()));
     }
     return evt;
      }
};

#endif

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