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[fg:hoorays-flightgear.git] / src / Scenery / SceneryPager.hxx
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 // $Id$
20
21 #ifndef FLIGHTGEAR_SCENERYPAGERHXX
22 #define FLIGHTGEAR_SCENERYPAGERHXX 1
23 #include <string>
24 #include <vector>
25
26 #include <osg/FrameStamp>
27 #include <osg/Group>
28 #include <osgDB/DatabasePager>
29
30 #include <simgear/structure/OSGVersion.hxx>
31
32 namespace flightgear
33 {
34 class SceneryPager : public osgDB::DatabasePager
35 {
36 public:
37     SceneryPager();
38     SceneryPager(const SceneryPager& rhs);
39     // Unhide DatabasePager::requestNodeFile
40     using osgDB::DatabasePager::requestNodeFile;
41     void queueRequest(const std::string& fileName, osg::Group* node,
42                       float priority, osg::FrameStamp* frameStamp,
43                       osg::ref_ptr<osg::Referenced>& databaseRequest,
44                       osgDB::ReaderWriter::Options* options);
45     // This is passed a ref_ptr so that it can "take ownership" of the
46     // node to delete and decrement its refcount while holding the
47     // lock on the delete list.
48     void queueDeleteRequest(osg::ref_ptr<osg::Object>& objptr);
49     virtual void signalEndFrame();
50 protected:
51     // Queue up file requests until the end of the frame
52     struct PagerRequest
53     {
54         PagerRequest() : _priority(0.0f), _databaseRequest(0) {}
55         PagerRequest(const PagerRequest& rhs) :
56             _fileName(rhs._fileName), _group(rhs._group),
57             _priority(rhs._priority), _frameStamp(rhs._frameStamp),
58             _options(rhs._options), _databaseRequest(rhs._databaseRequest) {}
59
60         PagerRequest(const std::string& fileName, osg::Group* group,
61                      float priority, osg::FrameStamp* frameStamp,
62                      osg::ref_ptr<Referenced>& databaseRequest,
63                      osgDB::ReaderWriter::Options* options):
64             _fileName(fileName), _group(group), _priority(priority),
65             _frameStamp(frameStamp), _options(options),
66             _databaseRequest(&databaseRequest)
67         {}
68
69         void doRequest(SceneryPager* pager);
70         std::string _fileName;
71         osg::ref_ptr<osg::Group> _group;
72         float _priority;
73         osg::ref_ptr<osg::FrameStamp> _frameStamp;
74         osg::ref_ptr<osgDB::ReaderWriter::Options> _options;
75         osg::ref_ptr<osg::Referenced>* _databaseRequest;
76     };
77     typedef std::vector<PagerRequest> PagerRequestList;
78     PagerRequestList _pagerRequests;
79     typedef std::vector<osg::ref_ptr<osg::Object> > DeleteRequestList;
80     DeleteRequestList _deleteRequests;
81     virtual ~SceneryPager();
82 };
83 }
84 #endif