e955c94ed3
Listing the "Blender Foundation" as copyright holder implied the Blender Foundation holds copyright to files which may include work from many developers. While keeping copyright on headers makes sense for isolated libraries, Blender's own code may be refactored or moved between files in a way that makes the per file copyright holders less meaningful. Copyright references to the "Blender Foundation" have been replaced with "Blender Authors", with the exception of `./extern/` since these this contains libraries which are more isolated, any changed to license headers there can be handled on a case-by-case basis. Some directories in `./intern/` have also been excluded: - `./intern/cycles/` it's own `AUTHORS` file is planned. - `./intern/opensubdiv/`. An "AUTHORS" file has been added, using the chromium projects authors file as a template. Design task: #110784 Ref !110783.
101 lines
2.9 KiB
C++
101 lines
2.9 KiB
C++
/* SPDX-FileCopyrightText: 2020 Blender Authors
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*
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* SPDX-License-Identifier: GPL-2.0-or-later */
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/** \file
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* \ingroup depsgraph
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*/
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#include "intern/builder/deg_builder_remove_noop.h"
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#include "MEM_guardedalloc.h"
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#include "intern/node/deg_node.h"
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#include "intern/node/deg_node_operation.h"
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#include "intern/debug/deg_debug.h"
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#include "intern/depsgraph.h"
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#include "intern/depsgraph_relation.h"
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#include "intern/depsgraph_type.h"
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namespace blender::deg {
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static inline bool is_unused_noop(OperationNode *op_node)
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{
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if (op_node == nullptr) {
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return false;
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}
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if (op_node->flag & OperationFlag::DEPSOP_FLAG_PINNED) {
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return false;
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}
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return op_node->is_noop() && op_node->outlinks.is_empty();
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}
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static inline bool is_removable_relation(const Relation *relation)
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{
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if (relation->from->type != NodeType::OPERATION || relation->to->type != NodeType::OPERATION) {
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return true;
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}
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const OperationNode *operation_from = static_cast<OperationNode *>(relation->from);
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const OperationNode *operation_to = static_cast<OperationNode *>(relation->to);
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/* If the relation connects two different IDs there is a high risk that the removal of the
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* relation will make it so visibility flushing is not possible at runtime. This happens with
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* relations like the DoF on camera of custom shape on bones: such relation do not lead to an
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* actual depsgraph evaluation operation as they are handled on render engine level.
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*
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* The indirectly linked objects could have some of their components invisible as well, so
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* also keep relations which connect different components of the same object so that visibility
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* tracking happens correct in those cases as well. */
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return operation_from->owner == operation_to->owner;
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}
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void deg_graph_remove_unused_noops(Depsgraph *graph)
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{
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deque<OperationNode *> queue;
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for (OperationNode *node : graph->operations) {
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if (is_unused_noop(node)) {
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queue.push_back(node);
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}
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}
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Vector<Relation *> relations_to_remove;
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while (!queue.empty()) {
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OperationNode *to_remove = queue.front();
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queue.pop_front();
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for (Relation *rel_in : to_remove->inlinks) {
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if (!is_removable_relation(rel_in)) {
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continue;
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}
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Node *dependency = rel_in->from;
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relations_to_remove.append(rel_in);
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/* Queue parent no-op node that has now become unused. */
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OperationNode *operation = dependency->get_exit_operation();
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if (is_unused_noop(operation)) {
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queue.push_back(operation);
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}
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}
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/* TODO(Sybren): Remove the node itself. */
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}
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/* Remove the relations. */
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for (Relation *relation : relations_to_remove) {
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relation->unlink();
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delete relation;
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}
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DEG_DEBUG_PRINTF((::Depsgraph *)graph,
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BUILD,
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"Removed %d relations to no-op nodes\n",
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int(relations_to_remove.size()));
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}
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} // namespace blender::deg
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