Fix old files with changed node socket type not loading correctly.

This would lead to sock.default_value pointing to the wrong data type,
possibly causing crashes. Unfortunately, this bug will still exist for
older Blender versions that try to load newer files, which makes
changing the type of a node socket problematic.

1 files changed, 20 insertions, 0 deletions

diff --git a/source/blender/blenkernel/intern/node.c b/source/blender/blenkernel/intern/node.c
index 6be6514b5ec..3bec7cf386a 100644
--- a/source/blender/blenkernel/intern/node.c
+++ b/source/blender/blenkernel/intern/node.c
@@ -506,6 +506,26 @@ static bNodeSocket *make_socket(bNodeTree *ntree, bNode *UNUSED(node), int in_ou
 	return sock;
 }
 
+void nodeModifySocketType(bNodeTree *ntree, bNode *UNUSED(node), bNodeSocket *sock,
+                          int type, int subtype)
+{
+	const char *idname = nodeStaticSocketType(type, subtype);
+
+	if (!idname) {
+		printf("Error: static node socket type %d undefined\n", type);
+		return;
+	}
+
+	if (sock->default_value) {
+		MEM_freeN(sock->default_value);
+		sock->default_value = NULL;
+	}
+
+	sock->type = type;
+	BLI_strncpy(sock->idname, idname, sizeof(sock->idname));
+	node_socket_set_typeinfo(ntree, sock, nodeSocketTypeFind(idname));
+}
+
 bNodeSocket *nodeAddSocket(bNodeTree *ntree, bNode *node, int in_out, const char *idname,
                            const char *identifier, const char *name)
 {