void OSLShader::loadShader( const std::string &shaderName, bool keepExistingValues )
{
const char *searchPath = getenv( "OSL_SHADER_PATHS" );
OSLQuery query;
if( !query.open( shaderName, searchPath ? searchPath : "" ) )
{
throw Exception( query.error() );
}
loadShaderParameters( query, parametersPlug(), keepExistingValues );
if( query.shadertype() == "shader" )
{
CompoundPlug *existingOut = getChild<CompoundPlug>( "out" );
if( !existingOut || existingOut->typeId() != CompoundPlug::staticTypeId() )
{
CompoundPlugPtr outPlug = new CompoundPlug( "out", Plug::Out, Plug::Default | Plug::Dynamic );
setChild( "out", outPlug );
}
loadShaderParameters( query, getChild<CompoundPlug>( "out" ), keepExistingValues );
}
else
{
Plug *existingOut = getChild<Plug>( "out" );
if( !existingOut || existingOut->typeId() != Plug::staticTypeId() )
{
PlugPtr outPlug = new Plug( "out", Plug::Out, Plug::Default | Plug::Dynamic );
setChild( "out", outPlug );
}
}
namePlug()->setValue( shaderName );
typePlug()->setValue( "osl:" + query.shadertype() );
m_metadata = NULL;
}
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() );
}
}
