113 lines
3.3 KiB
C++
113 lines
3.3 KiB
C++
/* -*-c++-*- OpenSceneGraph - Copyright (C) 1998-2003 Robert Osfield
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*
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* This library is open source and may be redistributed and/or modified under
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* the terms of the OpenSceneGraph Public License (OSGPL) version 0.0 or
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* (at your option) any later version. The full license is in LICENSE file
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* included with this distribution, and on the openscenegraph.org website.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* OpenSceneGraph Public License for more details.
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*/
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#include <osgTerrain/Terrain>
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#include <osgTerrain/GeoMipMapRenderer>
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using namespace osgTerrain;
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Terrain::Terrain()
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{
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setNumChildrenRequiringUpdateTraversal(1);
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}
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Terrain::Terrain(const Terrain& terrain,const osg::CopyOp& copyop):
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Group(terrain,copyop),
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_heightField(terrain._heightField)
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{
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setNumChildrenRequiringUpdateTraversal(getNumChildrenRequiringUpdateTraversal()+1);
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if (terrain.getRenderer()) setRenderer(dynamic_cast<Renderer*>(terrain.getRenderer()->cloneType()));
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}
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Terrain::~Terrain()
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{
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}
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void Terrain::traverse(osg::NodeVisitor& nv)
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{
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// if app traversal update the frame count.
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if (nv.getVisitorType()==osg::NodeVisitor::UPDATE_VISITOR)
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{
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// if no renderer exists that default to using the GeoMipMapRenderer
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if (!getRenderer()) setRenderer(new GeoMipMapRenderer);
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osgUtil::UpdateVisitor* uv = dynamic_cast<osgUtil::UpdateVisitor*>(&nv);
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if (getRenderer() && uv)
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{
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getRenderer()->update(uv);
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return;
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}
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}
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else if (nv.getVisitorType()==osg::NodeVisitor::CULL_VISITOR)
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{
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osgUtil::CullVisitor* cv = dynamic_cast<osgUtil::CullVisitor*>(&nv);
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if (getRenderer() && cv)
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{
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getRenderer()->cull(cv);
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return;
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}
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}
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// otherwise fallback to the Group::traverse()
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osg::Group::traverse(nv);
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}
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void Terrain::setHeightField(osg::HeightField* heightField)
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{
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_heightField = heightField;
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if (_renderer.valid()) _renderer->initialize();
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}
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void Terrain::haveModifiedHeightField()
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{
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if (_renderer.valid()) _renderer->terrainHasBeenModified();
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}
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void Terrain::setRenderer(osgTerrain::Renderer* renderer)
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{
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// need to figure out how to ensure that only one renderer is
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// used between terrain nodes... issue a warning?
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_renderer = renderer;
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if (_renderer.valid())
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{
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_renderer->_terrain = this;
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_renderer->initialize();
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}
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}
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void Terrain::computeNormalMap()
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{
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if (_heightField.valid())
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{
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osg::Image* image = new osg::Image;
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image->allocateImage(_heightField->getNumColumns(),_heightField->getNumRows(),1,GL_RGB,GL_BYTE);
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char* ptr = (char*) image->data();
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for(unsigned int r=0;r<_heightField->getNumRows();++r)
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{
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for(unsigned int c=0;c<_heightField->getNumColumns();++c)
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{
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osg::Vec3 normal = _heightField->getNormal(c,r);
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(*ptr++) = (char)((normal.x()+1.0)*0.5*255);
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(*ptr++) = (char)((normal.y()+1.0)*0.5*255);
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(*ptr++) = (char)((normal.z()+1.0)*0.5*255);
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}
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}
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setNormalMapImage(image);
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}
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}
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