76 lines
1.9 KiB
C++
76 lines
1.9 KiB
C++
#include <osgUtil/DrawElementTypeSimplifier>
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#include <osg/Geode>
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template <typename InType, typename OutType>
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OutType * copy(InType& array)
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{
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unsigned int size = array.size();
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OutType * newArray = new OutType(array.getMode(), size);
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OutType & na = *newArray;
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for (unsigned int i = 0; i < size; ++i) na[i] = array[i];
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return newArray;
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}
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template <typename InType>
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unsigned int getMax(InType& array)
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{
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unsigned int max = 0;
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unsigned int size = array.size();
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for (unsigned int i = 0; i < size; ++i)
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{
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if (array[i] > max) max = array[i];
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}
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return (max);
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}
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namespace osgUtil
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{
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void DrawElementTypeSimplifier::simplify(osg::Geometry & geometry) const
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{
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osg::Geometry::PrimitiveSetList & psl = geometry.getPrimitiveSetList();
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osg::Geometry::PrimitiveSetList::iterator it, end = psl.end();
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unsigned int max = 0;
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for (it = psl.begin(); it!=end; ++it)
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{
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switch ((*it)->getType())
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{
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case osg::PrimitiveSet::DrawElementsUShortPrimitiveType:
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{
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osg::DrawElementsUShort & de = *static_cast<osg::DrawElementsUShort*>(it->get());
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max = getMax<osg::DrawElementsUShort>(de);
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if (max < 255) *it = copy<osg::DrawElementsUShort, osg::DrawElementsUByte>(de);
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break;
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}
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case osg::PrimitiveSet::DrawElementsUIntPrimitiveType:
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{
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osg::DrawElementsUInt & de = *static_cast<osg::DrawElementsUInt*>(it->get());
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max = getMax<osg::DrawElementsUInt>(de);
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if (max < 256) *it = copy<osg::DrawElementsUInt, osg::DrawElementsUByte>(de);
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else if (max < 65536) *it = copy<osg::DrawElementsUInt, osg::DrawElementsUShort>(de);
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break;
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}
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default: break;
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}
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}
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}
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void DrawElementTypeSimplifierVisitor::apply(osg::Geometry& geom)
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{
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DrawElementTypeSimplifier dets;
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dets.simplify(geom);
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}
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}
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