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/*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software Foundation,
* Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*
* The Original Code is Copyright (C) 2020 Blender Foundation.
* All rights reserved.
*/
/** \file
* \ingroup depsgraph
*/
#include "intern/builder/deg_builder_remove_noop.h"
#include "MEM_guardedalloc.h"
#include "intern/node/deg_node.h"
#include "intern/node/deg_node_operation.h"
#include "intern/debug/deg_debug.h"
#include "intern/depsgraph.h"
#include "intern/depsgraph_relation.h"
#include "intern/depsgraph_type.h"
namespace blender {
namespace deg {
static inline bool is_unused_noop(OperationNode *op_node)
{
if (op_node == nullptr) {
return false;
}
if (op_node->flag & OperationFlag::DEPSOP_FLAG_PINNED) {
return false;
}
return op_node->is_noop() && op_node->outlinks.is_empty();
}
void deg_graph_remove_unused_noops(Depsgraph *graph)
{
int num_removed_relations = 0;
deque<OperationNode *> queue;
for (OperationNode *node : graph->operations) {
if (is_unused_noop(node)) {
queue.push_back(node);
}
}
while (!queue.empty()) {
OperationNode *to_remove = queue.front();
queue.pop_front();
while (!to_remove->inlinks.is_empty()) {
Relation *rel_in = to_remove->inlinks[0];
Node *dependency = rel_in->from;
/* Remove the relation. */
rel_in->unlink();
OBJECT_GUARDED_DELETE(rel_in, Relation);
num_removed_relations++;
/* Queue parent no-op node that has now become unused. */
OperationNode *operation = dependency->get_exit_operation();
if (is_unused_noop(operation)) {
queue.push_back(operation);
}
}
/* TODO(Sybren): Remove the node itself. */
}
DEG_DEBUG_PRINTF(
(::Depsgraph *)graph, BUILD, "Removed %d relations to no-op nodes\n", num_removed_relations);
}
} // namespace deg
} // namespace blender
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