void TextureUnitsUsageVisitor::apply( StateSet& stateSet )
{
// attribute
const StateSet::TextureAttributeList& taList = stateSet.getTextureAttributeList();
unsigned int c = taList.size();
if( _attributesFound.size() < c )
_attributesFound.resize( c, false );
for( unsigned int i=0; i<c; i++ )
{
// if attribute presence is already set, can skip all the tests for this texture unit
if( _attributesFound[i] )
continue;
// find any texture attribute for the particular texture unit
const StateSet::AttributeList& aList = taList[i];
for( StateSet::AttributeList::const_iterator it = aList.begin(); it != aList.end(); it++ )
{
if( it->second.first.get() != NULL )
{
_attributesFound[i] = true;
break;
}
}
}
// mode
const StateSet::TextureModeList& tmList = stateSet.getTextureModeList();
c = tmList.size();
if( _modeOn.size() < c )
_modeOn.resize( c, false );
for( unsigned int i=0; i<c; i++ )
{
// if mode is already set, can skip all the tests for this texture unit
if( _modeOn[i] )
continue;
const StateSet::ModeList& mList = tmList[i];
StateSet::ModeList::const_iterator it = mList.find( GL_TEXTURE_2D );
if( it != mList.end() )
{
const StateAttribute::GLModeValue value = it->second;
if( (value & StateAttribute::ON) != 0 )
_modeOn[i] = true;
}
}
}
