static IECore::ConstCompoundDataPtr metadataGetter( const std::string &key, size_t &cost )
{
cost = 1;
if( !key.size() )
{
return NULL;
}
const char *searchPath = getenv( "OSL_SHADER_PATHS" );
OSLQuery query;
if( !query.open( key, searchPath ? searchPath : "" ) )
{
throw Exception( query.geterror() );
}
CompoundDataPtr metadata = new CompoundData;
metadata->writable()["shader"] = convertMetadata( query.metadata() );
CompoundDataPtr parameterMetadata = new CompoundData;
metadata->writable()["parameter"] = parameterMetadata;
for( size_t i = 0; i < query.nparams(); ++i )
{
const OSLQuery::Parameter *parameter = query.getparam( i );
if( parameter->metadata.size() )
{
string nameWithoutSuffix;
const OSLQuery::Parameter *positionsParameter;
const OSLQuery::Parameter *valuesParameter;
const OSLQuery::Parameter *basisParameter;
// If this parameter is part of a spline, register the metadata onto the spline plug
if( findSplineParameters( query, parameter, nameWithoutSuffix, positionsParameter, valuesParameter, basisParameter ) )
{
// We merge metadata found on all the parameters that make up the plug, but in no particular order.
// If you specify conflicting metadata on the different parameters you may get inconsistent results.
CompoundData *prevData = parameterMetadata->member<CompoundData>( nameWithoutSuffix );
CompoundDataPtr data = convertMetadata( parameter->metadata );
if( prevData )
{
data->writable().insert( prevData->readable().begin(), prevData->readable().end() );
}
parameterMetadata->writable()[nameWithoutSuffix] = data;
}
else
{
parameterMetadata->writable()[parameter->name.c_str()] = convertMetadata( parameter->metadata );
}
}
}
return metadata;
}
void OSLShader::loadShader( const std::string &shaderName, bool keepExistingValues )
{
Plug *existingOut = outPlug();
if( shaderName.empty() )
{
parametersPlug()->clearChildren();
namePlug()->setValue( "" );
typePlug()->setValue( "" );
if( existingOut )
{
existingOut->clearChildren();
}
return;
}
const char *searchPath = getenv( "OSL_SHADER_PATHS" );
OSLQuery query;
if( !query.open( shaderName, searchPath ? searchPath : "" ) )
{
throw Exception( query.geterror() );
}
const bool outPlugHadChildren = existingOut ? existingOut->children().size() : false;
if( !keepExistingValues )
{
// If we're not preserving existing values then remove all existing
// parameter plugs - the various plug creators above know that if a
// plug exists then they should preserve its values.
parametersPlug()->clearChildren();
if( existingOut )
{
existingOut->clearChildren();
}
}
m_metadata = NULL;
namePlug()->setValue( shaderName );
typePlug()->setValue( std::string( "osl:" ) + query.shadertype().c_str() );
const IECore::CompoundData *metadata = OSLShader::metadata();
const IECore::CompoundData *parameterMetadata = NULL;
if( metadata )
{
parameterMetadata = metadata->member<IECore::CompoundData>( "parameter" );
}
loadShaderParameters( query, parametersPlug(), parameterMetadata );
if( !existingOut || existingOut->typeId() != Plug::staticTypeId() )
{
PlugPtr outPlug = new Plug( "out", Plug::Out, Plug::Default | Plug::Dynamic );
if( existingOut )
{
// We had an out plug but it was the wrong type (we used
// to use a CompoundPlug before that was deprecated). Move
// over any existing child plugs onto our replacement.
for( PlugIterator it( existingOut ); !it.done(); ++it )
{
outPlug->addChild( *it );
}
}
setChild( "out", outPlug );
}
if( query.shadertype() == "shader" )
{
loadShaderParameters( query, outPlug(), parameterMetadata );
}
else
{
outPlug()->clearChildren();
}
if( static_cast<bool>( outPlug()->children().size() ) != outPlugHadChildren )
{
// OSLShaderUI registers a dynamic metadata entry which depends on whether or
// not the plug has children, so we must notify the world that the value will
// have changed.
Metadata::plugValueChangedSignal()( staticTypeId(), "out", "nodule:type", outPlug() );
}
}
