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, 47 insertions, 0 deletions

diff --git a/source/blender/makesrna/intern/rna_nodetree.c b/source/blender/makesrna/intern/rna_nodetree.c
index b372ff4c273..65de8c479b8 100644
--- a/source/blender/makesrna/intern/rna_nodetree.c
+++ b/source/blender/makesrna/intern/rna_nodetree.c
@@ -4113,6 +4113,38 @@ void rna_ShaderNodePointDensity_density_minmax(bNode *self,
   RE_point_density_minmax(depsgraph, pd, r_min, r_max);
 }
 
+static void rna_NodeInputString_string_get(PointerRNA *ptr, char *value)
+{
+  bNode *node = (bNode *)ptr->data;
+  NodeInputString *storage = node->storage;
+
+  strcpy(value, (storage->string) ? storage->string : "");
+}
+
+static int rna_NodeInputString_string_length(PointerRNA *ptr)
+{
+  bNode *node = (bNode *)ptr->data;
+  NodeInputString *storage = node->storage;
+
+  return (storage->string) ? strlen(storage->string) : 0;
+}
+
+static void rna_NodeInputString_string_set(PointerRNA *ptr, const char *value)
+{
+  bNode *node = (bNode *)ptr->data;
+  NodeInputString *storage = node->storage;
+
+  if (storage->string) {
+    MEM_freeN(storage->string);
+  }
+
+  if (value && value[0]) {
+    storage->string = BLI_strdup(value);
+  }
+  else {
+    storage->string = NULL;
+  }
+}
 #else
 
 static const EnumPropertyItem prop_image_layer_items[] = {
@@ -4539,6 +4571,21 @@ static void def_fn_input_vector(StructRNA *srna)
   RNA_def_property_update(prop, NC_NODE | NA_EDITED, "rna_Node_update");
 }
 
+static void def_fn_input_string(StructRNA *srna)
+{
+  PropertyRNA *prop;
+
+  RNA_def_struct_sdna_from(srna, "NodeInputString", "storage");
+
+  prop = RNA_def_property(srna, "string", PROP_STRING, PROP_NONE);
+  RNA_def_property_string_funcs(prop,
+                                "rna_NodeInputString_string_get",
+                                "rna_NodeInputString_string_length",
+                                "rna_NodeInputString_string_set");
+  RNA_def_property_ui_text(prop, "String", "");
+  RNA_def_property_update(prop, NC_NODE | NA_EDITED, "rna_Node_update");
+}
+
 /* -- Shader Nodes ---------------------------------------------------------- */
 
 static void def_sh_output(StructRNA *srna)