COM_profiler.hh

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/* SPDX-FileCopyrightText: 2024 Blender Authors
 *
 * SPDX-License-Identifier: GPL-2.0-or-later */
 
#pragma once
 
#include "BLI_map.hh"
#include "BLI_timeit.hh"
 
#include "DNA_node_types.h"
 
#include "NOD_derived_node_tree.hh"
 
namespace blender::realtime_compositor {
 
class Context;
 
/* -------------------------------------------------------------------------------------------------
 * Profiler
 *
 * A class that profiles the evaluation of the compositor and tracks information like the
 * evaluation time of every node. */
class Profiler {
 private:
  /* Stores the evaluation time of each node instance keyed by its instance key. Note that
   * pixel-wise nodes like Math nodes will not be measured, that's because they are compiled
   * together with other pixel-wise operations in a single operation, so we can't measure the
   * evaluation time of each individual node. */
  Map<bNodeInstanceKey, timeit::Nanoseconds> nodes_evaluation_times_;
 
 public:
  /* Returns a reference to the nodes evaluation times. */
  Map<bNodeInstanceKey, timeit::Nanoseconds> &get_nodes_evaluation_times();
 
  /* Set the evaluation time of the node identified by the given node instance key. */
  void set_node_evaluation_time(bNodeInstanceKey node_instance_key, timeit::Nanoseconds time);
 
  /* Finalize profiling by computing node group times. This should be called after evaluation. */
  void finalize(const bNodeTree &node_tree);
 
 private:
  /* Computes the evaluation time of every group node inside the given tree recursively by
   * accumulating the evaluation time of its nodes, setting the computed time to the group nodes.
   * The time is returned since the method is called recursively. */
  timeit::Nanoseconds accumulate_node_group_times(const bNodeTree &node_tree,
                                                  bNodeInstanceKey instance_key);
};
 
}  // namespace blender::realtime_compositor