309 lines
10 KiB
C++
309 lines
10 KiB
C++
/* -*-c++-*- OpenSceneGraph - Copyright (C) 1998-2006 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 <osg/PagedLOD>
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#include <osg/CullStack>
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#include <osg/Notify>
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#include <algorithm>
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using namespace osg;
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PagedLOD::PerRangeData::PerRangeData():
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_priorityOffset(0.0f),
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_priorityScale(1.0f),
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_minExpiryTime(0.0),
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_minExpiryFrames(0),
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_timeStamp(0.0f),
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_frameNumber(0),
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_frameNumberOfLastReleaseGLObjects(0) {}
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PagedLOD::PerRangeData::PerRangeData(const PerRangeData& prd):
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_filename(prd._filename),
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_priorityOffset(prd._priorityOffset),
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_priorityScale(prd._priorityScale),
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_minExpiryTime(prd._minExpiryTime),
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_minExpiryFrames(prd._minExpiryFrames),
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_timeStamp(prd._timeStamp),
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_frameNumber(prd._frameNumber),
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_frameNumberOfLastReleaseGLObjects(prd._frameNumberOfLastReleaseGLObjects),
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_databaseRequest(prd._databaseRequest) {}
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PagedLOD::PerRangeData& PagedLOD::PerRangeData::operator = (const PerRangeData& prd)
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{
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if (this==&prd) return *this;
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_filename = prd._filename;
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_priorityOffset = prd._priorityOffset;
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_priorityScale = prd._priorityScale;
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_timeStamp = prd._timeStamp;
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_frameNumber = prd._frameNumber;
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_frameNumberOfLastReleaseGLObjects = prd._frameNumberOfLastReleaseGLObjects;
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_databaseRequest = prd._databaseRequest;
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_minExpiryTime = prd._minExpiryTime;
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_minExpiryFrames = prd._minExpiryFrames;
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return *this;
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}
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PagedLOD::PagedLOD()
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{
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_frameNumberOfLastTraversal = 0;
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_centerMode = USER_DEFINED_CENTER;
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_radius = -1;
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_numChildrenThatCannotBeExpired = 0;
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_disableExternalChildrenPaging = false;
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}
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PagedLOD::PagedLOD(const PagedLOD& plod,const CopyOp& copyop):
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LOD(plod,copyop),
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_databaseOptions(plod._databaseOptions),
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_databasePath(plod._databasePath),
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_frameNumberOfLastTraversal(plod._frameNumberOfLastTraversal),
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_numChildrenThatCannotBeExpired(plod._numChildrenThatCannotBeExpired),
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_disableExternalChildrenPaging(plod._disableExternalChildrenPaging),
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_perRangeDataList(plod._perRangeDataList)
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{
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}
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PagedLOD::~PagedLOD()
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{
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}
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void PagedLOD::setDatabasePath(const std::string& path)
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{
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_databasePath = path;
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if (!_databasePath.empty())
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{
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char& lastCharacter = _databasePath[_databasePath.size()-1];
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const char unixSlash = '/';
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const char winSlash = '\\';
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if (lastCharacter==winSlash)
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{
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lastCharacter = unixSlash;
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}
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else if (lastCharacter!=unixSlash)
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{
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_databasePath += unixSlash;
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}
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/*
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// make sure the last character is the appropriate slash
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#ifdef WIN32
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if (lastCharacter==unixSlash)
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{
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lastCharacter = winSlash;
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}
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else if (lastCharacter!=winSlash)
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{
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_databasePath += winSlash;
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}
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#else
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if (lastCharacter==winSlash)
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{
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lastCharacter = unixSlash;
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}
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else if (lastCharacter!=unixSlash)
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{
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_databasePath += unixSlash;
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}
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#endif
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*/
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}
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}
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void PagedLOD::traverse(NodeVisitor& nv)
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{
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// set the frame number of the traversal so that external nodes can find out how active this
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// node is.
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if (nv.getFrameStamp() &&
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nv.getVisitorType()==osg::NodeVisitor::CULL_VISITOR)
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{
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setFrameNumberOfLastTraversal(nv.getFrameStamp()->getFrameNumber());
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}
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double timeStamp = nv.getFrameStamp()?nv.getFrameStamp()->getReferenceTime():0.0;
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unsigned int frameNumber = nv.getFrameStamp()?nv.getFrameStamp()->getFrameNumber():0;
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bool updateTimeStamp = nv.getVisitorType()==osg::NodeVisitor::CULL_VISITOR;
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switch(nv.getTraversalMode())
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{
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case(NodeVisitor::TRAVERSE_ALL_CHILDREN):
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std::for_each(_children.begin(),_children.end(),NodeAcceptOp(nv));
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break;
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case(NodeVisitor::TRAVERSE_ACTIVE_CHILDREN):
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{
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float required_range = 0;
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if (_rangeMode==DISTANCE_FROM_EYE_POINT)
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{
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required_range = nv.getDistanceToViewPoint(getCenter(),true);
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}
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else
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{
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osg::CullStack* cullStack = nv.asCullStack();
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if (cullStack && cullStack->getLODScale()>0.0f)
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{
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required_range = cullStack->clampedPixelSize(getBound()) / cullStack->getLODScale();
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}
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else
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{
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// fallback to selecting the highest res tile by
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// finding out the max range
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for(unsigned int i=0;i<_rangeList.size();++i)
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{
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required_range = osg::maximum(required_range,_rangeList[i].first);
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}
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}
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}
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int lastChildTraversed = -1;
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bool needToLoadChild = false;
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for(unsigned int i=0;i<_rangeList.size();++i)
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{
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if (_rangeList[i].first<=required_range && required_range<_rangeList[i].second)
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{
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if (i<_children.size())
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{
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if (updateTimeStamp)
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{
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_perRangeDataList[i]._timeStamp=timeStamp;
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_perRangeDataList[i]._frameNumber=frameNumber;
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}
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_children[i]->accept(nv);
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lastChildTraversed = (int)i;
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}
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else
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{
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needToLoadChild = true;
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}
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}
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}
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if (needToLoadChild)
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{
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unsigned int numChildren = _children.size();
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// select the last valid child.
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if (numChildren>0 && ((int)numChildren-1)!=lastChildTraversed)
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{
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if (updateTimeStamp)
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{
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_perRangeDataList[numChildren-1]._timeStamp=timeStamp;
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_perRangeDataList[numChildren-1]._frameNumber=frameNumber;
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}
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_children[numChildren-1]->accept(nv);
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}
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// now request the loading of the next unloaded child.
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if (!_disableExternalChildrenPaging &&
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nv.getDatabaseRequestHandler() &&
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numChildren<_perRangeDataList.size())
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{
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// compute priority from where abouts in the required range the distance falls.
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float priority = (_rangeList[numChildren].second-required_range)/(_rangeList[numChildren].second-_rangeList[numChildren].first);
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// invert priority for PIXEL_SIZE_ON_SCREEN mode
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if(_rangeMode==PIXEL_SIZE_ON_SCREEN)
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{
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priority = -priority;
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}
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// modify the priority according to the child's priority offset and scale.
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priority = _perRangeDataList[numChildren]._priorityOffset + priority * _perRangeDataList[numChildren]._priorityScale;
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if (_databasePath.empty())
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{
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nv.getDatabaseRequestHandler()->requestNodeFile(_perRangeDataList[numChildren]._filename,nv.getNodePath(),priority,nv.getFrameStamp(), _perRangeDataList[numChildren]._databaseRequest, _databaseOptions.get());
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}
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else
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{
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// prepend the databasePath to the child's filename.
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nv.getDatabaseRequestHandler()->requestNodeFile(_databasePath+_perRangeDataList[numChildren]._filename,nv.getNodePath(),priority,nv.getFrameStamp(), _perRangeDataList[numChildren]._databaseRequest, _databaseOptions.get());
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}
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}
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}
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break;
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}
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default:
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break;
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}
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}
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void PagedLOD::expandPerRangeDataTo(unsigned int pos)
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{
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if (pos>=_perRangeDataList.size()) _perRangeDataList.resize(pos+1);
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}
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bool PagedLOD::addChild( Node *child )
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{
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if (LOD::addChild(child))
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{
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expandPerRangeDataTo(_children.size()-1);
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return true;
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}
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return false;
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}
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bool PagedLOD::addChild(Node *child, float min, float max)
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{
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if (LOD::addChild(child,min,max))
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{
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expandPerRangeDataTo(_children.size()-1);
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return true;
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}
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return false;
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}
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bool PagedLOD::addChild(Node *child, float min, float max,const std::string& filename, float priorityOffset, float priorityScale)
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{
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if (LOD::addChild(child,min,max))
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{
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setFileName(_children.size()-1,filename);
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setPriorityOffset(_children.size()-1,priorityOffset);
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setPriorityScale(_children.size()-1,priorityScale);
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return true;
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}
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return false;
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}
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bool PagedLOD::removeChildren( unsigned int pos,unsigned int numChildrenToRemove)
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{
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if (pos<_rangeList.size()) _rangeList.erase(_rangeList.begin()+pos, osg::minimum(_rangeList.begin()+(pos+numChildrenToRemove), _rangeList.end()) );
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if (pos<_perRangeDataList.size()) _perRangeDataList.erase(_perRangeDataList.begin()+pos, osg::minimum(_perRangeDataList.begin()+ (pos+numChildrenToRemove), _perRangeDataList.end()) );
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return Group::removeChildren(pos,numChildrenToRemove);
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}
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bool PagedLOD::removeExpiredChildren(double expiryTime, unsigned int expiryFrame, NodeList& removedChildren)
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{
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if (_children.size()>_numChildrenThatCannotBeExpired)
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{
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unsigned cindex = _children.size() - 1;
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if (!_perRangeDataList[cindex]._filename.empty() &&
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_perRangeDataList[cindex]._timeStamp + _perRangeDataList[cindex]._minExpiryTime < expiryTime &&
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_perRangeDataList[cindex]._frameNumber + _perRangeDataList[cindex]._minExpiryFrames < expiryFrame)
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{
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osg::Node* nodeToRemove = _children[cindex].get();
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removedChildren.push_back(nodeToRemove);
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return Group::removeChildren(cindex,1);
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}
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}
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return false;
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}
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