src/Scenery/SceneryPager.cxx

   1 // SceneryPager.cxx -- 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 #ifdef HAVE_CONFIG_H
  20 #  include <config.h>
  21 #endif
  22
  23 #include <simgear/math/SGMath.hxx>
  24 #include "SceneryPager.hxx"
  25 #include <algorithm>
  26 #include <functional>
  27
  28 using namespace osg;
  29 using namespace flightgear;
  30
  31 SceneryPager::SceneryPager()
  32 {
  33     _pagerRequests.reserve(48);
  34     _deleteRequests.reserve(16);
  35 }
  36
  37 SceneryPager::SceneryPager(const SceneryPager& rhs) :
  38     DatabasePager(rhs)
  39 {
  40 }
  41
  42 SceneryPager::~SceneryPager()
  43 {
  44 }
  45
  46 void SceneryPager::queueRequest(const std::string& fileName, Group* group,
  47                                 float priority, FrameStamp* frameStamp,
  48                                 ref_ptr<Referenced>& databaseRequest,
  49                                 osgDB::ReaderWriter::Options* options)
  50 {
  51     _pagerRequests.push_back(PagerRequest(fileName, group, priority,
  52                                           frameStamp,
  53                                           databaseRequest,
  54                                           options));
  55 }
  56
  57 void SceneryPager::queueDeleteRequest(osg::ref_ptr<osg::Object>& objptr)
  58 {
  59     _deleteRequests.push_back(objptr);
  60     objptr = 0;
  61 }
  62
  63 // Work around interface change in
  64 // osgDB::DatabasePager::requestNodeFile
  65 namespace
  66 {
  67 struct NodePathProxy
  68 {
  69     NodePathProxy(NodePath& nodePath)
  70         : _nodePath(nodePath)
  71     {
  72     }
  73     operator Group* () { return static_cast<Group*>(_nodePath.back()); }
  74     operator NodePath& () { return _nodePath; }
  75     NodePath& _nodePath;
  76 };
  77 }
  78
  79 void SceneryPager::PagerRequest::doRequest(SceneryPager* pager)
  80 {
  81     if (_group->getNumChildren() == 0) {
  82         NodePath path;
  83         path.push_back(_group.get());
  84         pager->requestNodeFile(_fileName, NodePathProxy(path), _priority,
  85                                _frameStamp.get(),
  86                                *_databaseRequest,
  87                                _options.get());
  88     }
  89 }
  90
  91 void SceneryPager::signalEndFrame()
  92 {
  93     using namespace std;
  94     bool areDeleteRequests = false;
  95     bool arePagerRequests = false;
  96     if (!_deleteRequests.empty()) {
  97         areDeleteRequests = true;
  98         OpenThreads::ScopedLock<OpenThreads::Mutex>
  99             lock(_fileRequestQueue->_childrenToDeleteListMutex);
 100         ObjectList& deleteList = _fileRequestQueue->_childrenToDeleteList;
 101         deleteList.insert(deleteList.end(),
 102                           _deleteRequests.begin(),
 103                           _deleteRequests.end());
 104         _deleteRequests.clear();
 105     }
 106     if (!_pagerRequests.empty()) {
 107         arePagerRequests = true;
 108         for_each(_pagerRequests.begin(), _pagerRequests.end(),
 109                  bind2nd(mem_fun_ref(&PagerRequest::doRequest), this));
 110         _pagerRequests.clear();
 111     }
 112     if (areDeleteRequests && !arePagerRequests) {
 113         _fileRequestQueue->updateBlock();
 114     }
 115     DatabasePager::signalEndFrame();
 116 }
 117