Geometry Nodes: fields and anonymous attributes

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

1 files changed, 6 insertions, 1 deletions

diff --git a/source/blender/nodes/NOD_static_types.h b/source/blender/nodes/NOD_static_types.h
index 2e9f186de02..670cde4470e 100644
--- a/source/blender/nodes/NOD_static_types.h
+++ b/source/blender/nodes/NOD_static_types.h
@@ -276,6 +276,7 @@ DefNode(GeometryNode, GEO_NODE_ATTRIBUTE_COMBINE_XYZ, def_geo_attribute_combine_
 DefNode(GeometryNode, GEO_NODE_ATTRIBUTE_COMPARE, def_geo_attribute_attribute_compare, "ATTRIBUTE_COMPARE", AttributeCompare, "Attribute Compare", "")
 DefNode(GeometryNode, GEO_NODE_ATTRIBUTE_CONVERT, def_geo_attribute_convert, "ATTRIBUTE_CONVERT", AttributeConvert, "Attribute Convert", "")
 DefNode(GeometryNode, GEO_NODE_ATTRIBUTE_CURVE_MAP, def_geo_attribute_curve_map, "ATTRIBUTE_CURVE_MAP", AttributeCurveMap, "Attribute Curve Map", "")
+DefNode(GeometryNode, GEO_NODE_ATTRIBUTE_CAPTURE, def_geo_attribute_capture, "ATTRIBUTE_CAPTURE", AttributeCapture, "Attribute Capture", "")
 DefNode(GeometryNode, GEO_NODE_ATTRIBUTE_FILL, def_geo_attribute_fill, "ATTRIBUTE_FILL", AttributeFill, "Attribute Fill", "")
 DefNode(GeometryNode, GEO_NODE_ATTRIBUTE_MAP_RANGE, def_geo_attribute_map_range, "ATTRIBUTE_MAP_RANGE", AttributeMapRange, "Attribute Map Range", "")
 DefNode(GeometryNode, GEO_NODE_ATTRIBUTE_MATH, def_geo_attribute_math, "ATTRIBUTE_MATH", AttributeMath, "Attribute Math", "")
@@ -304,8 +305,8 @@ DefNode(GeometryNode, GEO_NODE_CURVE_PRIMITIVE_SPIRAL, 0, "CURVE_PRIMITIVE_SPIRA
 DefNode(GeometryNode, GEO_NODE_CURVE_PRIMITIVE_STAR, 0, "CURVE_PRIMITIVE_STAR", CurveStar, "Star", "")
 DefNode(GeometryNode, GEO_NODE_CURVE_RESAMPLE, def_geo_curve_resample, "CURVE_RESAMPLE", CurveResample, "Resample Curve", "")
 DefNode(GeometryNode, GEO_NODE_CURVE_REVERSE, 0, "CURVE_REVERSE", CurveReverse, "Curve Reverse", "")
-DefNode(GeometryNode, GEO_NODE_CURVE_SET_HANDLES, def_geo_curve_set_handles, "CURVE_SET_HANDLES", CurveSetHandles, "Set Handle Type", "")
 DefNode(GeometryNode, GEO_NODE_CURVE_SELECT_HANDLES, def_geo_curve_select_handles, "CURVE_SELECT_HANDLES", CurveSelectHandles, "Select by Handle Type", "")
+DefNode(GeometryNode, GEO_NODE_CURVE_SET_HANDLES, def_geo_curve_set_handles, "CURVE_SET_HANDLES", CurveSetHandles, "Set Handle Type", "")
 DefNode(GeometryNode, GEO_NODE_CURVE_SPLINE_TYPE, def_geo_curve_spline_type, "CURVE_SPLINE_TYPE", CurveSplineType, "Set Spline Type", "")
 DefNode(GeometryNode, GEO_NODE_CURVE_SUBDIVIDE, def_geo_curve_subdivide, "CURVE_SUBDIVIDE", CurveSubdivide, "Curve Subdivide", "")
 DefNode(GeometryNode, GEO_NODE_CURVE_TO_MESH, 0, "CURVE_TO_MESH", CurveToMesh, "Curve to Mesh", "")
@@ -313,7 +314,10 @@ DefNode(GeometryNode, GEO_NODE_CURVE_TO_POINTS, def_geo_curve_to_points, "CURVE_
 DefNode(GeometryNode, GEO_NODE_CURVE_TRIM, def_geo_curve_trim, "CURVE_TRIM", CurveTrim, "Curve Trim", "")
 DefNode(GeometryNode, GEO_NODE_DELETE_GEOMETRY, 0, "DELETE_GEOMETRY", DeleteGeometry, "Delete Geometry", "")
 DefNode(GeometryNode, GEO_NODE_EDGE_SPLIT, 0, "EDGE_SPLIT", EdgeSplit, "Edge Split", "")
+DefNode(GeometryNode, GEO_NODE_INPUT_INDEX, 0, "INDEX", InputIndex, "Index", "")
 DefNode(GeometryNode, GEO_NODE_INPUT_MATERIAL, def_geo_input_material, "INPUT_MATERIAL", InputMaterial, "Material", "")
+DefNode(GeometryNode, GEO_NODE_INPUT_NORMAL, 0, "INPUT_NORMAL", InputNormal, "Normal", "")
+DefNode(GeometryNode, GEO_NODE_INPUT_POSITION, 0, "POSITION", InputPosition, "Position", "")
 DefNode(GeometryNode, GEO_NODE_IS_VIEWPORT, 0, "IS_VIEWPORT", IsViewport, "Is Viewport", "")
 DefNode(GeometryNode, GEO_NODE_JOIN_GEOMETRY, 0, "JOIN_GEOMETRY", JoinGeometry, "Join Geometry", "")
 DefNode(GeometryNode, GEO_NODE_MATERIAL_ASSIGN, 0, "MATERIAL_ASSIGN", MaterialAssign, "Material Assign", "")
@@ -339,6 +343,7 @@ DefNode(GeometryNode, GEO_NODE_POINTS_TO_VOLUME, def_geo_points_to_volume, "POIN
 DefNode(GeometryNode, GEO_NODE_RAYCAST, def_geo_raycast, "RAYCAST", Raycast, "Raycast", "")
 DefNode(GeometryNode, GEO_NODE_SELECT_BY_MATERIAL, 0, "SELECT_BY_MATERIAL", SelectByMaterial, "Select by Material", "")
 DefNode(GeometryNode, GEO_NODE_SEPARATE_COMPONENTS, 0, "SEPARATE_COMPONENTS", SeparateComponents, "Separate Components", "")
+DefNode(GeometryNode, GEO_NODE_SET_POSITION, 0, "SET_POSITION", SetPosition, "Set Position", "")
 DefNode(GeometryNode, GEO_NODE_SUBDIVISION_SURFACE, def_geo_subdivision_surface, "SUBDIVISION_SURFACE", SubdivisionSurface, "Subdivision Surface", "")
 DefNode(GeometryNode, GEO_NODE_SWITCH, def_geo_switch, "SWITCH", Switch, "Switch", "")
 DefNode(GeometryNode, GEO_NODE_TRANSFORM, 0, "TRANSFORM", Transform, "Transform", "")