depsgraph_relation.hh

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/* SPDX-FileCopyrightText: 2020 Blender Authors
 *
 * SPDX-License-Identifier: GPL-2.0-or-later */

 
#pragma once
 
namespace blender::deg {
 
struct Node;
 
/* Settings/Tags on Relationship.
 * NOTE: Is a bitmask, allowing accumulation. */
enum RelationFlag {
  /* "cyclic" link - when detecting cycles, this relationship was the one
   * which triggers a cyclic relationship to exist in the graph. */
  RELATION_FLAG_CYCLIC = (1 << 0),
  /* Update flush will not go through this relation. */
  RELATION_FLAG_NO_FLUSH = (1 << 1),
  /* Only flush along the relation is update comes from a node which was
   * affected by user input. */
  RELATION_FLAG_FLUSH_USER_EDIT_ONLY = (1 << 2),
  /* The relation can not be killed by the cyclic dependencies solver. */
  RELATION_FLAG_GODMODE = (1 << 4),
  /* Relation will check existence before being added. */
  RELATION_CHECK_BEFORE_ADD = (1 << 5),
  /* The relation does not participate in visibility checks. */
  RELATION_NO_VISIBILITY_CHANGE = (1 << 6),
};
 
/* B depends on A (A -> B) */
struct Relation {
  Relation(Node *from, Node *to, const char *description) : from(from), to(to), name(description)
  {
  }
 
  void unlink();
 
  /* the nodes in the relationship (since this is shared between the nodes) */
  Node *from; /* A */
  Node *to;   /* B */
 
  /* relationship attributes */
  const char *name; /* label for debugging */
  int flag = 0;     /* Bitmask of RelationFlag) */
};
 
}  // namespace blender::deg