bool
FltExportVisitor::atLeastOneMesh( const osg::Geometry& geom ) const
{
// Return true if at least one PrimitiveSet mode will use a Mesh record.
unsigned int jdx;
for (jdx=0; jdx < geom.getNumPrimitiveSets(); jdx++)
{
const osg::PrimitiveSet* prim = geom.getPrimitiveSet( jdx );
if( isMesh( prim->getMode() ) )
return true;
}
// All PrimitiveSet modes will use Face records.
return false;
}
// Billboards also go through this code. The Geode is passed
// to writeFace and writeMesh. If those methods successfully cast
// the Geode to a Billboard, then they set the template mode
// bit accordingly.
void
FltExportVisitor::apply( osg::Geode& node )
{
_firstNode = false;
ScopedStatePushPop guard( this, node.getStateSet() );
unsigned int idx;
for (idx=0; idx<node.getNumDrawables(); idx++)
{
osg::Geometry* geom = node.getDrawable( idx )->asGeometry();
if (!geom)
{
std::string warning( "fltexp: Non-Geometry Drawable encountered. Ignoring." );
osg::notify( osg::WARN ) << warning << std::endl;
_fltOpt->getWriteResult().warn( warning );
continue;
}
ScopedStatePushPop drawableGuard( this, geom->getStateSet() );
// Push and pop subfaces if polygon offset is on.
SubfaceHelper subface( *this, getCurrentStateSet() );
if (atLeastOneFace( *geom ))
{
// If at least one record will be a Face record, then we
// need to write to the vertex palette.
_vertexPalette->add( *geom );
// Iterate over all PrimitiveSets and output Face records.
unsigned int jdx;
for (jdx=0; jdx < geom->getNumPrimitiveSets(); jdx++)
{
osg::PrimitiveSet* prim = geom->getPrimitiveSet( jdx );
if ( isMesh( prim->getMode() ) )
continue;
if (prim->getType() == osg::PrimitiveSet::DrawArraysPrimitiveType)
handleDrawArrays( dynamic_cast<osg::DrawArrays*>( prim ), *geom, node );
else if (prim->getType() == osg::PrimitiveSet::DrawArrayLengthsPrimitiveType)
handleDrawArrayLengths( dynamic_cast<osg::DrawArrayLengths*>( prim ), *geom, node );
else if ( (prim->getType() == osg::PrimitiveSet::DrawElementsUBytePrimitiveType) ||
(prim->getType() == osg::PrimitiveSet::DrawElementsUShortPrimitiveType) ||
(prim->getType() == osg::PrimitiveSet::DrawElementsUIntPrimitiveType) )
handleDrawElements( dynamic_cast<osg::DrawElements*>( prim ), *geom, node );
else
{
std::string warning( "fltexp: Unknown PrimitiveSet type." );
osg::notify( osg::WARN ) << warning << std::endl;
_fltOpt->getWriteResult().warn( warning );
return;
}
}
}
if (atLeastOneMesh( *geom ))
{
// If at least one Mesh record, write out preamble mesh records
// followed by a Mesh Primitive record per PrimitiveSet.
writeMesh( node, *geom );
writeMatrix( node.getUserData() );
writeComment( node );
writeMultitexture( *geom );
writeLocalVertexPool( *geom );
writePush();
unsigned int jdx;
for (jdx=0; jdx < geom->getNumPrimitiveSets(); jdx++)
{
osg::PrimitiveSet* prim = geom->getPrimitiveSet( jdx );
if ( !isMesh( prim->getMode() ) )
continue;
if (prim->getType() == osg::PrimitiveSet::DrawArraysPrimitiveType)
handleDrawArrays( dynamic_cast<osg::DrawArrays*>( prim ), *geom, node );
else if (prim->getType() == osg::PrimitiveSet::DrawArrayLengthsPrimitiveType)
handleDrawArrayLengths( dynamic_cast<osg::DrawArrayLengths*>( prim ), *geom, node );
else if ( (prim->getType() == osg::PrimitiveSet::DrawElementsUBytePrimitiveType) ||
(prim->getType() == osg::PrimitiveSet::DrawElementsUShortPrimitiveType) ||
(prim->getType() == osg::PrimitiveSet::DrawElementsUIntPrimitiveType) )
handleDrawElements( dynamic_cast<osg::DrawElements*>( prim ), *geom, node );
else
{
std::string warning( "fltexp: Unknown PrimitiveSet type." );
osg::notify( osg::WARN ) << warning << std::endl;
_fltOpt->getWriteResult().warn( warning );
return;
}
}
writePop();
}
}
// Would traverse here if this node could have children.
// traverse( (osg::Node&)node );
}
