IECore::ConstObjectPtr OSLObject::computeProcessedObject( const ScenePath &path, const Gaffer::Context *context, IECore::ConstObjectPtr inputObject ) const
{
const Primitive *inputPrimitive = runTimeCast<const Primitive>( inputObject.get() );
if( !inputPrimitive )
{
return inputObject;
}
if( !inputPrimitive->variableData<V3fVectorData>( "P", PrimitiveVariable::Vertex ) )
{
return inputObject;
}
OSLRenderer::ConstShadingEnginePtr shadingEngine = OSLImage::shadingEngine( shaderPlug() );
if( !shadingEngine )
{
return inputObject;
}
CompoundDataPtr shadingPoints = new CompoundData;
for( PrimitiveVariableMap::const_iterator it = inputPrimitive->variables.begin(), eIt = inputPrimitive->variables.end(); it != eIt; ++it )
{
if( it->second.interpolation == PrimitiveVariable::Vertex )
{
// cast is ok - we're only using it to be able to reference the data from the shadingPoints,
// but nothing will modify the data itself.
shadingPoints->writable()[it->first] = constPointerCast<Data>( it->second.data );
}
}
PrimitivePtr outputPrimitive = inputPrimitive->copy();
ConstCompoundDataPtr shadedPoints = shadingEngine->shade( shadingPoints );
const std::vector<Color3f> &ci = shadedPoints->member<Color3fVectorData>( "Ci" )->readable();
V3fVectorDataPtr p = new V3fVectorData;
p->writable().reserve( ci.size() );
std::copy( ci.begin(), ci.end(), back_inserter( p->writable() ) );
outputPrimitive->variables["P"] = PrimitiveVariable( PrimitiveVariable::Vertex, p );
/// \todo Allow shaders to write arbitrary primitive variables.
return outputPrimitive;
}
IECore::ConstCompoundDataPtr OSLImage::computeShading( const Gaffer::Context *context ) const
{
OSLRenderer::ConstShadingEnginePtr shadingEngine;
if( const OSLShader *shader = runTimeCast<const OSLShader>( shaderPlug()->source<Plug>()->node() ) )
{
shadingEngine = shader->shadingEngine();
}
if( !shadingEngine )
{
return static_cast<const CompoundData *>( shadingPlug()->defaultValue() );
}
const V2i tileOrigin = context->get<V2i>( ImagePlug::tileOriginContextName );
const Format format = inPlug()->formatPlug()->getValue();
CompoundDataPtr shadingPoints = new CompoundData();
V3fVectorDataPtr pData = new V3fVectorData;
FloatVectorDataPtr uData = new FloatVectorData;
FloatVectorDataPtr vData = new FloatVectorData;
vector<V3f> &pWritable = pData->writable();
vector<float> &uWritable = uData->writable();
vector<float> &vWritable = vData->writable();
const size_t tileSize = ImagePlug::tileSize();
pWritable.reserve( tileSize * tileSize );
uWritable.reserve( tileSize * tileSize );
vWritable.reserve( tileSize * tileSize );
/// \todo Non-zero display window origins - do we have those?
const float uStep = 1.0f / format.width();
const float uMin = 0.5f * uStep;
const float vStep = 1.0f / format.height();
const float vMin = 0.5f * vStep;
const size_t xMax = tileOrigin.x + tileSize;
const size_t yMax = tileOrigin.y + tileSize;
for( size_t y = tileOrigin.y; y < yMax; ++y )
{
const float v = vMin + y * vStep;
for( size_t x = tileOrigin.x; x < xMax; ++x )
{
uWritable.push_back( uMin + x * uStep );
vWritable.push_back( v );
pWritable.push_back( V3f( x, y, 0.0f ) );
}
}
shadingPoints->writable()["P"] = pData;
shadingPoints->writable()["u"] = uData;
shadingPoints->writable()["v"] = vData;
ConstStringVectorDataPtr channelNamesData = inPlug()->channelNamesPlug()->getValue();
const vector<string> &channelNames = channelNamesData->readable();
for( vector<string>::const_iterator it = channelNames.begin(), eIt = channelNames.end(); it != eIt; ++it )
{
shadingPoints->writable()[*it] = boost::const_pointer_cast<FloatVectorData>( inPlug()->channelData( *it, tileOrigin ) );
}
CompoundDataPtr result = shadingEngine->shade( shadingPoints.get() );
// remove results that aren't suitable to become channels
for( CompoundDataMap::iterator it = result->writable().begin(); it != result->writable().end(); )
{
CompoundDataMap::iterator nextIt = it; nextIt++;
if( !runTimeCast<FloatVectorData>( it->second ) )
{
result->writable().erase( it );
}
it = nextIt;
}
return result;
}