Geometry Nodes: Add string input node

This commit adds a simple string input node, intended for use in the
attribute workflow to make using the same attribute name in multiple
places easier. The node is function node similar to the existing vector
input node.

Ref T84971

Differential Revision: https://developer.blender.org/D10316

1 files changed, 13 insertions, 0 deletions

diff --git a/source/blender/blenkernel/intern/node.cc b/source/blender/blenkernel/intern/node.cc
index 228d3e0d825..b96adce7cca 100644
--- a/source/blender/blenkernel/intern/node.cc
+++ b/source/blender/blenkernel/intern/node.cc
@@ -523,6 +523,13 @@ void ntreeBlendWrite(BlendWriter *writer, bNodeTree *ntree)
         BLO_write_struct_by_name(writer, node->typeinfo->storagename, node->storage);
         MEM_SAFE_FREE(nc->matte_id);
       }
+      else if (node->type == FN_NODE_INPUT_STRING) {
+        NodeInputString *storage = (NodeInputString *)node->storage;
+        if (storage->string) {
+          BLO_write_string(writer, storage->string);
+        }
+        BLO_write_struct_by_name(writer, node->typeinfo->storagename, storage);
+      }
       else if (node->typeinfo != &NodeTypeUndefined) {
         BLO_write_struct_by_name(writer, node->typeinfo->storagename, node->storage);
       }
@@ -685,6 +692,11 @@ void ntreeBlendReadData(BlendDataReader *reader, bNodeTree *ntree)
           iuser->scene = nullptr;
           break;
         }
+        case FN_NODE_INPUT_STRING: {
+          NodeInputString *storage = (NodeInputString *)node->storage;
+          BLO_read_data_address(reader, &storage->string);
+          break;
+        }
         default:
           break;
       }
@@ -4806,6 +4818,7 @@ static void registerFunctionNodes()
   register_node_type_fn_combine_strings();
   register_node_type_fn_float_compare();
   register_node_type_fn_group_instance_id();
+  register_node_type_fn_input_string();
   register_node_type_fn_input_vector();
   register_node_type_fn_object_transforms();
   register_node_type_fn_random_float();