1 /* -*-c++-*- */
2 /* osgEarth - Dynamic map generation toolkit for OpenSceneGraph
3 * Copyright 2008-2013 Pelican Mapping
4 * http://osgearth.org
5 *
6 * osgEarth is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU Lesser General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
10 *
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
14 * GNU Lesser General Public License for more details.
15 *
16 * You should have received a copy of the GNU Lesser General Public License
17 * along with this program.  If not, see <http://www.gnu.org/licenses/>
18 */
19 #include "TerrainNode"
20 #include "QuickReleaseGLObjects"
21 
22 #include <osgEarth/Registry>
23 #include <osgEarth/Map>
24 #include <osgEarth/NodeUtils>
25 #include <osgEarth/ThreadingUtils>
26 
27 #include <osg/NodeCallback>
28 #include <osg/NodeVisitor>
29 #include <osg/Node>
30 #include <osgGA/EventVisitor>
31 
32 using namespace osgEarth_engine_quadtree;
33 using namespace osgEarth;
34 using namespace OpenThreads;
35 
36 #define LC "[TerrainNode] "
37 
38 //----------------------------------------------------------------------------
39 
TerrainNode(TileNodeRegistry * removedTiles)40 TerrainNode::TerrainNode(TileNodeRegistry* removedTiles ) :
41 _tilesToQuickRelease            ( removedTiles ),
42 _quickReleaseCallbackInstalled  ( false )
43 {
44     // tick the update count to install the quick release callback:
45     if ( _tilesToQuickRelease.valid() )
46     {
47         ADJUST_UPDATE_TRAV_COUNT( this, 1 );
48     }
49 }
50 
51 
52 void
traverse(osg::NodeVisitor & nv)53 TerrainNode::traverse( osg::NodeVisitor &nv )
54 {
55     if ( nv.getVisitorType() == nv.UPDATE_VISITOR )
56     {
57         // if the terrain engine requested "quick release", install the quick release
58         // draw callback now.
59         if ( !_quickReleaseCallbackInstalled && _tilesToQuickRelease.valid() )
60         {
61             osg::Camera* cam = findFirstParentOfType<osg::Camera>( this );
62             if ( cam )
63             {
64                 cam->setPostDrawCallback( new QuickReleaseGLObjects(
65                     _tilesToQuickRelease.get(),
66                     cam->getPostDrawCallback() ) );
67 
68                 _quickReleaseCallbackInstalled = true;
69                 OE_INFO << LC << "Quick release enabled" << std::endl;
70 
71                 // knock down the trav count set in the constructor.
72                 ADJUST_UPDATE_TRAV_COUNT( this, -1 );
73             }
74         }
75     }
76 
77     osg::Group::traverse( nv );
78 }
79