/usr/include/osgEarth/StateSetLOD is in libosgearth-dev 2.7.0+dfsg-2+b3.
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/* osgEarth - Dynamic map generation toolkit for OpenSceneGraph
* Copyright 2015 Pelican Mapping
* http://osgearth.org
*
* osgEarth is free software; you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
* IN THE SOFTWARE.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>
*/
#ifndef OSGEARTH_STATESET_LOD
#define OSGEARTH_STATESET_LOD
#include <osgEarth/Common>
#include <osg/Group>
#include <osg/StateSet>
#include <vector>
namespace osgEarth
{
/**
* Apply statesets based on value ranges.
*
* By default, this class works like osg::LOD and uses the camera's
* distance to the bounding center as the value used to select active
* statesets. You can change the metric by calling setGetValueFunction().
*/
class OSGEARTH_EXPORT StateSetLOD : public osg::Group
{
public:
StateSetLOD() { }
/** Adds a stateset to be applied within a value range. */
void addStateSet(osg::StateSet* stateset, float min, float max);
/** Number of LOD ranges */
unsigned getNumRanges() const { return (unsigned)_ranges.size(); }
/** Set the min and max value for a particular range */
void setRange(unsigned index, float min, float max);
/** Gets the minimum value for a range */
float getMinRange(unsigned index) const { return _ranges[index].first; }
/** Gets the maximum value for a range */
float getMaxRange(unsigned index) const { return _ranges[index].second; }
/** Gets the state set at a range */
osg::StateSet* getStateSet(unsigned index) const { return _stateSets[index].get(); }
public:
class GetValue : public osg::Referenced
{
public:
virtual float operator()(osg::NodeVisitor& nv) = 0;
};
/**
* Sets a custom value generator. By default, the value will be the
* distance from the camera to the subgraph's bounding center. But you
* can get a custom metric by calling this method.
*/
void setGetValueFunction(GetValue* c) { _getValue = c; }
public: // osg::Group
virtual void traverse(osg::NodeVisitor& nv);
protected:
virtual ~StateSetLOD() { }
typedef std::pair<float, float> MinMaxPair;
typedef std::vector<MinMaxPair> RangeList;
typedef std::vector<osg::ref_ptr<osg::StateSet> > StateSetList;
RangeList _ranges;
StateSetList _stateSets;
osg::ref_ptr<GetValue> _getValue;
};
} // namespace osgEarth
#endif //OSGEARTH_STATESET_LOD
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