openscenegraph
GeometryTechnique
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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 OSGTERRAIN_GEOMETRYTECHNIQUE
15#define OSGTERRAIN_GEOMETRYTECHNIQUE 1
16
17#include <osg/MatrixTransform>
18#include <osg/Geode>
19#include <osg/Geometry>
20
21#include <osgTerrain/TerrainTechnique>
22#include <osgTerrain/Locator>
23
24namespace osgTerrain {
25
26class OSGTERRAIN_EXPORT GeometryTechnique : public TerrainTechnique
27{
28 public:
29
30 GeometryTechnique();
31
32 /** Copy constructor using CopyOp to manage deep vs shallow copy.*/
33 GeometryTechnique(const GeometryTechnique&,const osg::CopyOp& copyop=osg::CopyOp::SHALLOW_COPY);
34
35 META_Object(osgTerrain, GeometryTechnique);
36
37 virtual void init(int dirtyMask, bool assumeMultiThreaded);
38
39 virtual Locator* computeMasterLocator();
40
41
42 virtual void update(osgUtil::UpdateVisitor* nv);
43
44 virtual void cull(osgUtil::CullVisitor* nv);
45
46 /** Traverse the terain subgraph.*/
47 virtual void traverse(osg::NodeVisitor& nv);
48
49 virtual void cleanSceneGraph();
50
51 void setFilterBias(float filterBias);
52 float getFilterBias() const { return _filterBias; }
53
54 void setFilterWidth(float filterWidth);
55 float getFilterWidth() const { return _filterWidth; }
56
57 void setFilterMatrix(const osg::Matrix3& matrix);
58 osg::Matrix3& getFilterMatrix() { return _filterMatrix; }
59 const osg::Matrix3& getFilterMatrix() const { return _filterMatrix; }
60
61 enum FilterType
62 {
63 GAUSSIAN,
64 SMOOTH,
65 SHARPEN
66 };
67
68 void setFilterMatrixAs(FilterType filterType);
69
70 /** If State is non-zero, this function releases any associated OpenGL objects for
71 * the specified graphics context. Otherwise, releases OpenGL objects
72 * for all graphics contexts. */
73 virtual void releaseGLObjects(osg::State* = 0) const;
74
75
76 protected:
77
78 virtual ~GeometryTechnique();
79
80 class BufferData : public osg::Referenced
81 {
82 public:
83 BufferData() {}
84
85 osg::ref_ptr<osg::MatrixTransform> _transform;
86 osg::ref_ptr<osg::Geode> _geode;
87 osg::ref_ptr<osg::Geometry> _geometry;
88
89 protected:
90 ~BufferData() {}
91 };
92
93 virtual osg::Vec3d computeCenterModel(BufferData& buffer, Locator* masterLocator);
94
95 virtual void generateGeometry(BufferData& buffer, Locator* masterLocator, const osg::Vec3d& centerModel);
96
97 virtual void applyColorLayers(BufferData& buffer);
98
99 virtual void applyTransparency(BufferData& buffer);
100
101
102 OpenThreads::Mutex _writeBufferMutex;
103 osg::ref_ptr<BufferData> _currentBufferData;
104 osg::ref_ptr<BufferData> _newBufferData;
105
106 float _filterBias;
107 osg::ref_ptr<osg::Uniform> _filterBiasUniform;
108 float _filterWidth;
109 osg::ref_ptr<osg::Uniform> _filterWidthUniform;
110 osg::Matrix3 _filterMatrix;
111 osg::ref_ptr<osg::Uniform> _filterMatrixUniform;
112};
113
114}
115
116#endif