158 lines
4.3 KiB
C++
158 lines
4.3 KiB
C++
/* -*-c++-*- OpenSceneGraph - Copyright (C) 1998-2003 Robert Osfield
|
|
*
|
|
* This library is open source and may be redistributed and/or modified under
|
|
* the terms of the OpenSceneGraph Public License (OSGPL) version 0.0 or
|
|
* (at your option) any later version. The full license is in LICENSE file
|
|
* included with this distribution, and on the openscenegraph.org website.
|
|
*
|
|
* This library is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* OpenSceneGraph Public License for more details.
|
|
*/
|
|
#include <osg/LOD>
|
|
#include <osg/CullStack>
|
|
|
|
#include <algorithm>
|
|
|
|
using namespace osg;
|
|
|
|
LOD::LOD():
|
|
_centerMode(USE_BOUNDING_SPHERE_CENTER)
|
|
{
|
|
}
|
|
|
|
LOD::LOD(const LOD& lod,const CopyOp& copyop):
|
|
Group(lod,copyop),
|
|
_centerMode(lod._centerMode),
|
|
_userDefinedCenter(lod._userDefinedCenter),
|
|
_radius(lod._radius),
|
|
_rangeList(lod._rangeList)
|
|
{
|
|
}
|
|
|
|
|
|
void LOD::traverse(NodeVisitor& nv)
|
|
{
|
|
switch(nv.getTraversalMode())
|
|
{
|
|
case(NodeVisitor::TRAVERSE_ALL_CHILDREN):
|
|
std::for_each(_children.begin(),_children.end(),NodeAcceptOp(nv));
|
|
break;
|
|
case(NodeVisitor::TRAVERSE_ACTIVE_CHILDREN):
|
|
{
|
|
float required_range = 0;
|
|
if (_rangeMode==DISTANCE_FROM_EYE_POINT)
|
|
{
|
|
required_range = nv.getDistanceToEyePoint(getCenter(),true);
|
|
}
|
|
else
|
|
{
|
|
osg::CullStack* cullStack = dynamic_cast<osg::CullStack*>(&nv);
|
|
if (cullStack)
|
|
{
|
|
required_range = cullStack->pixelSize(getBound());
|
|
}
|
|
else
|
|
{
|
|
// fallback to selecting the highest res tile by
|
|
// finding out the max range
|
|
for(unsigned int i=0;i<_rangeList.size();++i)
|
|
{
|
|
required_range = osg::minimum(required_range,_rangeList[i].first);
|
|
}
|
|
}
|
|
}
|
|
|
|
unsigned int numChildren = _children.size();
|
|
if (_rangeList.size()<numChildren) numChildren=_rangeList.size();
|
|
|
|
for(unsigned int i=0;i<numChildren;++i)
|
|
{
|
|
if (_rangeList[i].first<=required_range && required_range<_rangeList[i].second)
|
|
{
|
|
_children[i]->accept(nv);
|
|
}
|
|
}
|
|
break;
|
|
}
|
|
default:
|
|
break;
|
|
}
|
|
}
|
|
|
|
bool LOD::computeBound() const
|
|
{
|
|
if (_centerMode==USER_DEFINED_CENTER && _radius>=0.0f)
|
|
{
|
|
_bsphere._center = _userDefinedCenter;
|
|
_bsphere._radius = _radius;
|
|
_bsphere_computed = true;
|
|
|
|
return true;
|
|
}
|
|
else
|
|
{
|
|
return Group::computeBound();
|
|
}
|
|
}
|
|
|
|
bool LOD::addChild( Node *child )
|
|
{
|
|
if (Group::addChild(child))
|
|
{
|
|
|
|
if (_children.size()>_rangeList.size())
|
|
{
|
|
float maxRange = !_rangeList.empty()?
|
|
maxRange=_rangeList.back().second : 0.0f;
|
|
|
|
_rangeList.resize(_children.size(),MinMaxPair(maxRange,maxRange));
|
|
}
|
|
|
|
return true;
|
|
}
|
|
return false;
|
|
}
|
|
|
|
void LOD::childRemoved(unsigned int /*pos*/, unsigned int /*numChildrenToRemove*/)
|
|
{
|
|
//std::cout<<"LOD::childRemoved("<<pos<<","<<numChildrenToRemove<<")"<<std::endl;
|
|
}
|
|
|
|
void LOD::childInserted(unsigned int /*pos*/)
|
|
{
|
|
//std::cout<<"LOD::childInserted("<<pos<<")"<<std::endl;
|
|
}
|
|
|
|
|
|
bool LOD::addChild(Node *child, float min, float max)
|
|
{
|
|
if (Group::addChild(child))
|
|
{
|
|
if (_children.size()>_rangeList.size()) _rangeList.resize(_children.size(),MinMaxPair(min,min));
|
|
_rangeList[_children.size()-1].first = min;
|
|
_rangeList[_children.size()-1].second = max;
|
|
return true;
|
|
}
|
|
return false;
|
|
}
|
|
|
|
bool LOD::removeChild( Node *child )
|
|
{
|
|
// find the child's position.
|
|
unsigned int pos=getChildIndex(child);
|
|
if (pos==_children.size()) return false;
|
|
|
|
_rangeList.erase(_rangeList.begin()+pos);
|
|
|
|
return Group::removeChild(child);
|
|
}
|
|
|
|
void LOD::setRange(unsigned int childNo, float min,float max)
|
|
{
|
|
if (childNo>=_rangeList.size()) _rangeList.resize(childNo+1,MinMaxPair(min,min));
|
|
_rangeList[childNo].first=min;
|
|
_rangeList[childNo].second=max;
|
|
}
|