root/OpenSceneGraph/trunk/include/osgVolume/VolumeTile @ 13041

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1/* -*-c++-*- OpenSceneGraph - Copyright (C) 1998-2009 Robert Osfield
2 *
3 * This library is open source and may be redistributed and/or modified under
4 * the terms of the OpenSceneGraph Public License (OSGPL) version 0.0 or
5 * (at your option) any later version.  The full license is in LICENSE file
6 * included with this distribution, and on the openscenegraph.org website.
7 *
8 * This library is distributed in the hope that it will be useful,
9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
11 * OpenSceneGraph Public License for more details.
12*/
13
14#ifndef OSGVOLUME_tile
15#define OSGVOLUME_tile 1
16
17#include <osg/Group>
18#include <osg/Image>
19
20#include <osgDB/ReaderWriter>
21
22#include <osgVolume/Layer>
23#include <osgVolume/VolumeTechnique>
24
25namespace osgVolume {
26
27class Volume;
28
29class OSGVOLUME_EXPORT TileID
30{
31    public:
32
33        TileID();
34
35        TileID(int in_level, int in_x, int in_y, int in_z);
36
37        bool operator == (const TileID& rhs) const
38        {
39            return (level==rhs.level) && (x==rhs.x) && (y==rhs.y) && (z==rhs.z);
40        }
41
42        bool operator != (const TileID& rhs) const
43        {
44            return (level!=rhs.level) || (x!=rhs.x) || (y!=rhs.y) || (z!=rhs.z);
45        }
46
47        bool operator < (const TileID& rhs) const
48        {
49            if (level<rhs.level) return true;
50            if (level>rhs.level) return false;
51            if (x<rhs.x) return true;
52            if (x>rhs.x) return false;
53            if (y<rhs.y) return true;
54            if (y>rhs.y) return false;
55            return z<rhs.z;
56        }
57
58        bool valid() const { return level>=0; }
59
60        int level;
61        int x;
62        int y;
63        int z;
64};
65
66
67/** VolumeTile provides a framework for loosely coupling 3d image data with rendering algorithms.
68  * This allows TerrainTechnique's to be plugged in at runtime.*/
69class OSGVOLUME_EXPORT VolumeTile : public osg::Group
70{
71    public:
72
73        VolumeTile();
74
75        /** Copy constructor using CopyOp to manage deep vs shallow copy.*/
76        VolumeTile(const VolumeTile&,const osg::CopyOp& copyop=osg::CopyOp::SHALLOW_COPY);
77
78        META_Node(osgVolume, VolumeTile);
79
80        virtual void traverse(osg::NodeVisitor& nv);
81
82        /** Call init on any attached TerrainTechnique.*/
83        void init();
84
85
86        /** Set the Volume that this Volume tile is a member of.*/
87        void setVolume(Volume* ts);
88
89        /** Get the Volume that this Volume tile is a member of.*/
90        Volume* getVolume() { return _volume; }
91
92        /** Get the const Volume that this Volume tile is a member of.*/
93        const Volume* getVolume() const { return _volume; }
94
95
96        /** Set the TileID (layer, x,y,z) of the VolumeTile.
97          * The TileID is used so it can be located by its neighbours
98          * via the enclosing Volume node that manages a map of TileID to VolumeTiles.*/
99        void setTileID(const TileID& tileID);
100
101        /** Get the TileID (layer, x,y,z) of the VolumeTile.*/
102        const TileID& getTileID() const { return _tileID; }
103
104
105        void setLocator(Locator* locator) { _locator = locator; }
106        Locator* getLocator() { return _locator.get(); }
107        const Locator* getLocator() const { return _locator.get(); }
108
109
110        void setLayer(Layer* layer);
111        Layer* getLayer() { return _layer.get(); }
112        const Layer* getLayer() const { return _layer.get(); }
113
114
115
116        /** Set the VolumeTechnique that will be used to render this tile. */
117        void setVolumeTechnique(VolumeTechnique* VolumeTechnique);
118
119        /** Get the VolumeTechnique that will be used to render this tile. */
120        VolumeTechnique* getVolumeTechnique() { return _volumeTechnique.get(); }
121
122        /** Get the const VolumeTechnique that will be used to render this tile. */
123        const VolumeTechnique* getVolumeTechnique() const { return _volumeTechnique.get(); }
124
125
126        /** Set the dirty flag on/off.*/
127        void setDirty(bool dirty);
128
129        /** return true if the tile is dirty and needs to be updated,*/
130        bool getDirty() const { return _dirty; }
131
132
133        virtual osg::BoundingSphere computeBound() const;
134
135    protected:
136
137        virtual ~VolumeTile();
138
139        friend class Volume;
140
141        Volume*                             _volume;
142
143        bool                                _dirty;
144        bool                                _hasBeenTraversal;
145
146        TileID                              _tileID;
147
148        osg::ref_ptr<VolumeTechnique>       _volumeTechnique;
149
150        osg::ref_ptr<Locator>               _locator;
151
152        osg::ref_ptr<Layer>                 _layer;
153};
154
155}
156
157#endif
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