Reroute nodes, by Jeroen Bakker (patch #28443).

By holding shift and "cutting" a node link a new reroute helper node can be inserted. This consists of a single socket that can be used to insert additional connection points into a link. This can be used to keep a connection point in the tree when  deleting a node, or to control the path of long connections for layout cleanup.

1 files changed, 49 insertions, 0 deletions

diff --git a/source/blender/nodes/intern/node_common.c b/source/blender/nodes/intern/node_common.c
index 48ffed80e41..9f458678ae0 100644
--- a/source/blender/nodes/intern/node_common.c
+++ b/source/blender/nodes/intern/node_common.c
@@ -835,3 +835,52 @@ void register_node_type_frame(bNodeTreeType *ttype)
 	ntype->needs_free = 1;
 	nodeRegisterType(ttype, ntype);
 }
+
+
+/* **************** REROUTE ******************** */
+
+static bNodeSocketTemplate node_reroute_in[]= {
+	{	SOCK_RGBA, 1, "Input",			0.0f, 0.0f, 0.0f, 1.0f, 0.0f, 1.0f},
+	{	-1, 0, ""	}
+};
+static bNodeSocketTemplate node_reroute_out[]= {
+	{	SOCK_RGBA, 0, "Output",			0.0f, 0.0f, 0.0f, 1.0f, 0.0f, 1.0f},
+	{	-1, 0, ""	}
+};
+
+/* simple, only a single input and output here */
+ListBase node_reroute_internal_connect(bNodeTree *ntree, bNode *node)
+{
+	bNodeLink *link;
+	ListBase ret;
+
+	ret.first = ret.last = NULL;
+
+	/* Security check! */
+	if(!ntree)
+		return ret;
+
+	link = MEM_callocN(sizeof(bNodeLink), "internal node link");
+	link->fromnode = node;
+	link->fromsock = node->inputs.first;
+	link->tonode = node;
+	link->tosock = node->outputs.first;
+	/* internal link is always valid */
+	link->flag |= NODE_LINK_VALID;
+	BLI_addtail(&ret, link);
+
+	return ret;
+}
+
+void register_node_type_reroute(bNodeTreeType *ttype)
+{
+	/* frame type is used for all tree types, needs dynamic allocation */
+	bNodeType *ntype= MEM_callocN(sizeof(bNodeType), "frame node type");
+	
+	node_type_base(ttype, ntype, NODE_REROUTE, "Reroute", NODE_CLASS_LAYOUT, 0);
+	node_type_socket_templates(ntype, node_reroute_in, node_reroute_out);
+	node_type_internal_connect(ntype, node_reroute_internal_connect);
+	
+	ntype->needs_free = 1;
+	nodeRegisterType(ttype, ntype);
+}