diff options
Diffstat (limited to 'intern/cycles/graph/node.h')
| -rw-r--r-- | intern/cycles/graph/node.h | 36 |
1 files changed, 36 insertions, 0 deletions
diff --git a/intern/cycles/graph/node.h b/intern/cycles/graph/node.h index 2fc9a1e0281..aa365baeccd 100644 --- a/intern/cycles/graph/node.h +++ b/intern/cycles/graph/node.h @@ -177,8 +177,32 @@ struct Node { const NodeOwner *get_owner() const; void set_owner(const NodeOwner *owner_); + int reference_count() const + { + return ref_count; + } + + void reference() + { + ref_count += 1; + } + + void dereference() + { + ref_count -= 1; + } + + /* Set the reference count to zero. This should only be called when we know for sure that the + * Node is not used by anyone else. For now, this is only the case when "deleting" shaders, as + * they are never actually deleted. */ + void clear_reference_count() + { + ref_count = 0; + } + protected: const NodeOwner *owner; + int ref_count{0}; template<typename T> static T &get_socket_value(const Node *node, const SocketType &socket) { @@ -189,7 +213,19 @@ struct Node { template<typename T> void set_if_different(const SocketType &input, T value); + /* Explicit overload for Node sockets so we can handle reference counting. The old Node is + * dereferenced, and the new one is referenced. */ + void set_if_different(const SocketType &input, Node *value); + template<typename T> void set_if_different(const SocketType &input, array<T> &value); + + /* Explicit overload for Node sockets so we can handle reference counting. The old Nodes are + * dereferenced, and the new ones are referenced. */ + void set_if_different(const SocketType &input, array<Node *> &value); + + /* Call this function in derived classes' destructors to ensure that used Nodes are dereferenced + * properly. */ + void dereference_all_used_nodes(); }; CCL_NAMESPACE_END |