Nodes: Add a callback to check for valid socket type

This adds a callback to bNodeTreeType to check which socket types are
valid for the tree type. Function has been implemented for the normal
tree types, and can be implemented for custom node trees with python,
by adding a `classmethod` to the tree. However, only builtin socket
types are supported.

This is relevant for T87049, but it also has the advantage that it is
now clear which node trees support which sockets. Previously this
was assumed to be known by all developers.

Differential Revision: https://developer.blender.org/D10938

1 files changed, 16 insertions, 0 deletions

diff --git a/source/blender/nodes/geometry/node_geometry_tree.cc b/source/blender/nodes/geometry/node_geometry_tree.cc
index 6d3b1d55005..afb86ff57b8 100644
--- a/source/blender/nodes/geometry/node_geometry_tree.cc
+++ b/source/blender/nodes/geometry/node_geometry_tree.cc
@@ -84,6 +84,21 @@ static void foreach_nodeclass(Scene *UNUSED(scene), void *calldata, bNodeClassCa
   func(calldata, NODE_CLASS_LAYOUT, N_("Layout"));
 }
 
+static bool geometry_node_tree_socket_type_valid(eNodeSocketDatatype socket_type,
+                                                 bNodeTreeType *UNUSED(ntreetype))
+{
+  return ELEM(socket_type,
+              SOCK_FLOAT,
+              SOCK_VECTOR,
+              SOCK_RGBA,
+              SOCK_BOOLEAN,
+              SOCK_INT,
+              SOCK_STRING,
+              SOCK_OBJECT,
+              SOCK_GEOMETRY,
+              SOCK_COLLECTION);
+}
+
 void register_node_tree_type_geo(void)
 {
   bNodeTreeType *tt = ntreeType_Geometry = static_cast<bNodeTreeType *>(
@@ -97,6 +112,7 @@ void register_node_tree_type_geo(void)
   tt->update = geometry_node_tree_update;
   tt->get_from_context = geometry_node_tree_get_from_context;
   tt->foreach_nodeclass = foreach_nodeclass;
+  tt->valid_socket_type = geometry_node_tree_socket_type_valid;
 
   ntreeTypeAdd(tt);
 }