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Geometry Nodes: fields and anonymous attributes

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This implements the initial core framework for fields and anonymous
attributes (also see T91274).

The new functionality is hidden behind the "Geometry Nodes Fields"
feature flag. When enabled in the user preferences, the following
new nodes become available: `Position`, `Index`, `Normal`,
`Set Position` and `Attribute Capture`.

Socket inspection has not been updated to work with fields yet.

Besides these changes at the user level, this patch contains the
ground work for:
* building and evaluating fields at run-time (`FN_fields.hh`) and
* creating and accessing anonymous attributes on geometry
  (`BKE_anonymous_attribute.h`).

For evaluating fields we use a new so called multi-function procedure
(`FN_multi_function_procedure.hh`). It allows composing multi-functions
in arbitrary ways and supports efficient evaluation as is required by
fields. See `FN_multi_function_procedure.hh` for more details on how
this evaluation mechanism can be used.

A new `AttributeIDRef` has been added which allows handling named
and anonymous attributes in the same way in many places.

Hans and I worked on this patch together.

Differential Revision: https://developer.blender.org/D12414
This commit is contained in:
Jacques Lucke
2021-09-09 12:54:20 +02:00
parent 0f6be4e152
commit bf47fb40fd
67 changed files with 6667 additions and 461 deletions
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28
source/blender/functions/intern/multi_function_builder.cc
View File

@@ -123,4 +123,32 @@ void CustomMF_DefaultOutput::call(IndexMask mask, MFParams params, MFContext UNU
}
}
CustomMF_GenericCopy::CustomMF_GenericCopy(StringRef name, MFDataType data_type)
{
MFSignatureBuilder signature{name};
signature.input("Input", data_type);
signature.output("Output", data_type);
signature_ = signature.build();
this->set_signature(&signature_);
}
void CustomMF_GenericCopy::call(IndexMask mask, MFParams params, MFContext UNUSED(context)) const
{
const MFDataType data_type = this->param_type(0).data_type();
switch (data_type.category()) {
case MFDataType::Single: {
const GVArray &inputs = params.readonly_single_input(0, "Input");
GMutableSpan outputs = params.uninitialized_single_output(1, "Output");
inputs.materialize_to_uninitialized(mask, outputs.data());
break;
}
case MFDataType::Vector: {
const GVVectorArray &inputs = params.readonly_vector_input(0, "Input");
GVectorArray &outputs = params.vector_output(1, "Output");
outputs.extend(mask, inputs);
break;
}
}
}
} // namespace blender::fn