Cycles: add update flags to Node and SocketType

Those flags are meant for detecting which socket has changed, so in the
future we can have more granular updates.

`Node` now stores an `update_flags` member which is modified every time
a socket is changed though `Node::set`. The flags are or-able bits
stored in `SocketType` instances. Each `SocketType` stores a unique bit
out of 64, for the 64 bits of an uint64_t; the bit
corresponds to the index of the socket in the `Node`'s sockets array +
1, so the socket at index 5 will have the 6th bit set as its flag. This
limits us to 64 sockets per Node, which should be plenty for the current
set of `Nodes` that we have.

This does not change the behavior of other parts of Cycles.

This is part of T79131.

Reviewed By: brecht

Maniphest Tasks: T79131

Differential Revision: https://developer.blender.org/D8644

1 files changed, 3 insertions, 0 deletions

diff --git a/intern/cycles/graph/node_type.h b/intern/cycles/graph/node_type.h
index a79d44b82f3..0d182945e16 100644
--- a/intern/cycles/graph/node_type.h
+++ b/intern/cycles/graph/node_type.h
@@ -28,6 +28,8 @@ CCL_NAMESPACE_BEGIN
 struct Node;
 struct NodeType;
 
+typedef uint64_t SocketModifiedFlags;
+
 /* Socket Type */
 
 struct SocketType {
@@ -88,6 +90,7 @@ struct SocketType {
   const NodeType **node_type;
   int flags;
   ustring ui_name;
+  SocketModifiedFlags modified_flag_bit;
 
   size_t size() const;
   bool is_array() const;