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