src/Scenery/SceneryPager.cxx

   1 // SceneryPager.hxx -- Interface to OSG database pager
   2 //
   3 // Copyright (C) 2007 Tim Moore timoore@redhat.com
   4 //
   5 // This program is free software; you can redistribute it and/or
   6 // modify it under the terms of the GNU General Public License as
   7 // published by the Free Software Foundation; either version 2 of the
   8 // License, or (at your option) any later version.
   9 //
  10 // This program is distributed in the hope that it will be useful, but
  11 // WITHOUT ANY WARRANTY; without even the implied warranty of
  12 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13 // General Public License for more details.
  14 //
  15 // You should have received a copy of the GNU General Public License
  16 // along with this program; if not, write to the Free Software
  17 // Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
  18
  19 #include <simgear/scene/model/SGPagedLOD.hxx>
  20 #include "SceneryPager.hxx"
  21 #include <algorithm>
  22 #include <functional>
  23
  24 using namespace flightgear;
  25 using osg::ref_ptr;
  26 using osg::Node;
  27
  28 SceneryPager::SceneryPager()
  29 {
  30     _pagerRequests.reserve(48);
  31     _deleteRequests.reserve(16);
  32     setExpiryDelay(120.0);
  33 }
  34
  35 SceneryPager::SceneryPager(const SceneryPager& rhs) :
  36     DatabasePager(rhs)
  37 {
  38 }
  39
  40 SceneryPager::~SceneryPager()
  41 {
  42 }
  43
  44 void SceneryPager::requestNodeFile(const std::string& fileName,osg::Group* group,
  45                                     float priority, const osg::FrameStamp* framestamp)
  46 {
  47     simgear::SGPagedLOD *sgplod = dynamic_cast<simgear::SGPagedLOD*>(group);
  48     if(sgplod)
  49         DatabasePager::requestNodeFile(fileName,group,priority,framestamp,sgplod->getReaderWriterOptions());
  50     else
  51         DatabasePager::requestNodeFile(fileName,group,priority,framestamp);
  52 }
  53
  54 void SceneryPager::queueRequest(const std::string& fileName, osg::Group* group,
  55                                 float priority, osg::FrameStamp* frameStamp,
  56                                 osgDB::ReaderWriter::Options* options)
  57 {
  58     _pagerRequests.push_back(PagerRequest(fileName, group, priority,
  59                                           frameStamp, options));
  60 }
  61
  62 void SceneryPager::queueDeleteRequest(osg::ref_ptr<osg::Object>& objptr)
  63 {
  64     _deleteRequests.push_back(objptr);
  65     objptr = 0;
  66 }
  67 void SceneryPager::signalEndFrame()
  68 {
  69     using namespace std;
  70     bool areDeleteRequests = false;
  71     bool arePagerRequests = false;
  72     if (!_deleteRequests.empty()) {
  73         areDeleteRequests = true;
  74         OpenThreads::ScopedLock<OpenThreads::Mutex>
  75             lock(_childrenToDeleteListMutex);
  76         _childrenToDeleteList.insert(_childrenToDeleteList.end(),
  77                                      _deleteRequests.begin(),
  78                                      _deleteRequests.end());
  79         _deleteRequests.clear();
  80     }
  81     if (!_pagerRequests.empty()) {
  82         arePagerRequests = true;
  83         for_each(_pagerRequests.begin(), _pagerRequests.end(),
  84                  bind2nd(mem_fun_ref(&PagerRequest::doRequest), this));
  85         _pagerRequests.clear();
  86     }
  87     if (areDeleteRequests && !arePagerRequests)
  88         updateDatabasePagerThreadBlock();
  89     DatabasePager::signalEndFrame();
  90 }
  91