root/OpenSceneGraph/trunk/include/osgShadow/ShadowTechnique @ 13041

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1/* -*-c++-*- OpenSceneGraph - Copyright (C) 1998-2006 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 OSGSHADOW_SHADOWEDTECHNIQUE
15#define OSGSHADOW_SHADOWEDTECHNIQUE 1
16
17#include <osg/buffered_value>
18#include <osg/Camera>
19#include <osg/Texture2D>
20#include <osg/TexGenNode>
21#include <osgUtil/CullVisitor>
22
23#include <osgShadow/Export>
24
25namespace osgShadow {
26
27// forward declare ShadowedScene
28class ShadowedScene;
29
30/** ShadowedScene provides a mechanism for decorating a scene that the needs to have shadows cast upon it.*/
31class OSGSHADOW_EXPORT ShadowTechnique : public osg::Object
32{
33    public :
34        ShadowTechnique();
35
36        ShadowTechnique(const ShadowTechnique& es, const osg::CopyOp& copyop=osg::CopyOp::SHALLOW_COPY);
37
38        META_Object(osgShadow, ShadowTechnique);
39
40        ShadowedScene* getShadowedScene() { return _shadowedScene; }
41
42        const ShadowedScene* getShadowedScene() const { return _shadowedScene; }
43
44        /** initialize the ShadowedScene and local cached data structures.*/
45        virtual void init();
46
47        /** run the update traversal of the ShadowedScene and update any local cached data structures.*/
48        virtual void update(osg::NodeVisitor& nv);
49
50        /** run the cull traversal of the ShadowedScene and set up the rendering for this ShadowTechnique.*/
51        virtual void cull(osgUtil::CullVisitor& cv);
52
53        /** Clean scene graph from any shadow technique specific nodes, state and drawables.*/
54        virtual void cleanSceneGraph();
55
56        virtual void traverse(osg::NodeVisitor& nv);
57
58        /** Dirty so that cached data structures are updated.*/
59        virtual void dirty() { _dirty = true; }
60
61    protected :
62
63        class OSGSHADOW_EXPORT CameraCullCallback : public osg::NodeCallback
64        {
65            public:
66
67                CameraCullCallback(ShadowTechnique* st);
68
69                virtual void operator()(osg::Node*, osg::NodeVisitor* nv);
70
71            protected:
72
73                ShadowTechnique* _shadowTechnique;
74        };
75
76        osg::Vec3 computeOrthogonalVector(const osg::Vec3& direction) const;
77
78        virtual ~ShadowTechnique();
79
80        friend class ShadowedScene;
81
82        ShadowedScene*  _shadowedScene;
83        bool            _dirty;
84
85};
86
87}
88
89#endif
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