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/scene/model/SGPagedLOD.hxx>
  24 #include <simgear/math/SGMath.hxx>
  25 #include "SceneryPager.hxx"
  26 #include <algorithm>
  27 #include <functional>
  28
  29 using namespace osg;
  30 using namespace flightgear;
  31
  32 SceneryPager::SceneryPager()
  33 {
  34     _pagerRequests.reserve(48);
  35     _deleteRequests.reserve(16);
  36 }
  37
  38 SceneryPager::SceneryPager(const SceneryPager& rhs) :
  39     DatabasePager(rhs)
  40 {
  41 }
  42
  43 SceneryPager::~SceneryPager()
  44 {
  45 }
  46
  47 #if SG_PAGEDLOD_HAS_OPTIONS
  48 #else
  49 void SceneryPager::requestNodeFile(const std::string& fileName, Group* group,
  50                                    float priority, const FrameStamp* framestamp,
  51                                    ref_ptr<Referenced>& databaseRequest,
  52                                    osgDB::ReaderWriter::Options* options)
  53 {
  54     simgear::SGPagedLOD *sgplod = dynamic_cast<simgear::SGPagedLOD*>(group);
  55     if(sgplod)
  56         DatabasePager::requestNodeFile(fileName, group, priority, framestamp,
  57                                        databaseRequest,
  58                                        sgplod->getReaderWriterOptions());
  59     else
  60         DatabasePager::requestNodeFile(fileName, group, priority, framestamp,
  61                                        databaseRequest,
  62                                        options);
  63 }
  64 #endif
  65
  66 void SceneryPager::queueRequest(const std::string& fileName, Group* group,
  67                                 float priority, FrameStamp* frameStamp,
  68                                 ref_ptr<Referenced>& databaseRequest,
  69                                 osgDB::ReaderWriter::Options* options)
  70 {
  71     _pagerRequests.push_back(PagerRequest(fileName, group, priority,
  72                                           frameStamp,
  73                                           databaseRequest,
  74                                           options));
  75 }
  76
  77 void SceneryPager::queueDeleteRequest(osg::ref_ptr<osg::Object>& objptr)
  78 {
  79     _deleteRequests.push_back(objptr);
  80     objptr = 0;
  81 }
  82
  83 // Work around interface change in
  84 // osgDB::DatabasePager::requestNodeFile
  85 namespace
  86 {
  87 struct NodePathProxy
  88 {
  89     NodePathProxy(NodePath& nodePath)
  90         : _nodePath(nodePath)
  91     {
  92     }
  93     operator Group* () { return static_cast<Group*>(_nodePath.back()); }
  94     operator NodePath& () { return _nodePath; }
  95     NodePath& _nodePath;
  96 };
  97 }
  98
  99 void SceneryPager::PagerRequest::doRequest(SceneryPager* pager)
 100 {
 101     if (_group->getNumChildren() == 0) {
 102         NodePath path;
 103         path.push_back(_group.get());
 104         pager->requestNodeFile(_fileName, NodePathProxy(path), _priority,
 105                                _frameStamp.get(),
 106                                *_databaseRequest,
 107                                _options.get());
 108     }
 109 }
 110
 111 void SceneryPager::signalEndFrame()
 112 {
 113     using namespace std;
 114     bool areDeleteRequests = false;
 115     bool arePagerRequests = false;
 116     if (!_deleteRequests.empty()) {
 117         areDeleteRequests = true;
 118         OpenThreads::ScopedLock<OpenThreads::Mutex>
 119             lock(_fileRequestQueue->_childrenToDeleteListMutex);
 120         ObjectList& deleteList = _fileRequestQueue->_childrenToDeleteList;
 121         deleteList.insert(deleteList.end(),
 122                           _deleteRequests.begin(),
 123                           _deleteRequests.end());
 124         _deleteRequests.clear();
 125     }
 126     if (!_pagerRequests.empty()) {
 127         arePagerRequests = true;
 128         for_each(_pagerRequests.begin(), _pagerRequests.end(),
 129                  bind2nd(mem_fun_ref(&PagerRequest::doRequest), this));
 130         _pagerRequests.clear();
 131     }
 132     if (areDeleteRequests && !arePagerRequests) {
 133         _fileRequestQueue->updateBlock();
 134     }
 135     DatabasePager::signalEndFrame();
 136 }
 137