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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 | /* -*-c++-*- */
/* osgEarth - Dynamic map generation toolkit for OpenSceneGraph
* Copyright 2016 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_TESSELLATOR_H
#define OSGEARTH_TESSELLATOR_H 1
#include <osgEarth/Common>
#include <osg/Geometry>
namespace osgEarth {
/**
* Polygon tessellator using a modified ear clipping technique
*/
class OSGEARTH_EXPORT Tessellator
{
public:
bool tessellateGeometry(osg::Geometry &geom);
protected:
osg::PrimitiveSet* tessellatePrimitive(osg::PrimitiveSet* primitive, osg::Vec3Array* vertices);
osg::PrimitiveSet* tessellatePrimitive(unsigned int first, unsigned int last, osg::Vec3Array* vertices);
bool isConvex(const osg::Vec3Array &vertices, const std::vector<unsigned int> &activeVerts, unsigned int cursor);
bool isEar(const osg::Vec3Array &vertices, const std::vector<unsigned int> &activeVerts, unsigned int cursor, bool &tradEar);
};
} // namespace osgEarth
#endif // OSGEARTH_TESSELLATOR_H
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