Geometry Nodes: Add preferred domain to many field inputs

The preferred domain is used to decide which domain the viewer node
should use when set to "Auto" domain. This commit adds it to some curve
input nodes and the curve and mesh topology nodes. This makes debugging
node setups with these nodes a bit faster and less frustrating.

1 files changed, 10 insertions, 0 deletions

diff --git a/source/blender/nodes/geometry/nodes/node_geo_mesh_topology_corners_of_face.cc b/source/blender/nodes/geometry/nodes/node_geo_mesh_topology_corners_of_face.cc
index 94bca02640b..95ae169a6e4 100644
--- a/source/blender/nodes/geometry/nodes/node_geo_mesh_topology_corners_of_face.cc
+++ b/source/blender/nodes/geometry/nodes/node_geo_mesh_topology_corners_of_face.cc
@@ -117,6 +117,11 @@ class CornersOfFaceInput final : public bke::MeshFieldInput {
     }
     return false;
   }
+
+  std::optional<eAttrDomain> preferred_domain(const Mesh & /*mesh*/)const final
+  {
+    return ATTR_DOMAIN_FACE;
+  }
 };
 
 static int get_poly_totloop(const MPoly &poly)
@@ -153,6 +158,11 @@ class CornersOfFaceCountInput final : public bke::MeshFieldInput {
     }
     return false;
   }
+
+  std::optional<eAttrDomain> preferred_domain(const Mesh & /*mesh*/)const final
+  {
+    return ATTR_DOMAIN_FACE;
+  }
 };
 
 static void node_geo_exec(GeoNodeExecParams params)