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/* SPDX-License-Identifier: GPL-2.0-or-later
* Copyright 2022 Blender Foundation. All rights reserved. */
/** \file
* \ingroup depsgraph
*/
#include "intern/eval/deg_eval_visibility.h"
#include "DNA_layer_types.h"
#include "DNA_object_types.h"
#include "BLI_assert.h"
#include "BLI_stack.h"
#include "DEG_depsgraph.h"
#include "intern/depsgraph.h"
#include "intern/depsgraph_relation.h"
#include "intern/node/deg_node.h"
#include "intern/node/deg_node_component.h"
#include "intern/node/deg_node_id.h"
#include "intern/node/deg_node_operation.h"
namespace blender::deg {
void deg_evaluate_object_node_visibility(::Depsgraph *depsgraph, IDNode *id_node)
{
BLI_assert(GS(id_node->id_cow->name) == ID_OB);
Depsgraph *graph = reinterpret_cast<Depsgraph *>(depsgraph);
const Object *object = reinterpret_cast<const Object *>(id_node->id_cow);
DEG_debug_print_eval(depsgraph, __func__, object->id.name, &object->id);
const int required_flags = (graph->mode == DAG_EVAL_VIEWPORT) ? BASE_ENABLED_VIEWPORT :
BASE_ENABLED_RENDER;
const bool is_enabled = object->base_flag & required_flags;
if (id_node->is_enabled_on_eval != is_enabled) {
id_node->is_enabled_on_eval = is_enabled;
/* Tag dependency graph for changed visibility, so that it is updated on all dependencies prior
* to a pass of an actual evaluation. */
graph->need_update_nodes_visibility = true;
}
}
void deg_graph_flush_visibility_flags(Depsgraph *graph)
{
enum {
DEG_NODE_VISITED = (1 << 0),
};
for (IDNode *id_node : graph->id_nodes) {
for (ComponentNode *comp_node : id_node->components.values()) {
comp_node->possibly_affects_visible_id = id_node->is_visible_on_build;
comp_node->affects_visible_id = id_node->is_visible_on_build && id_node->is_enabled_on_eval;
/* Visibility component is always to be considered to have the same visibility as the
* `id_node->is_visible_on_build`. This is because the visibility is to be evaluated
* regardless of its current state as it might get changed due to animation. */
if (comp_node->type == NodeType::VISIBILITY) {
comp_node->affects_visible_id = id_node->is_visible_on_build;
}
/* Enforce "visibility" of the synchronization component.
*
* This component is never connected to other ID nodes, and hence can not be handled in the
* same way as other components needed for evaluation. It is only needed for proper
* evaluation of the ID node it belongs to.
*
* The design is such that the synchronization is supposed to happen whenever any part of the
* ID changed/evaluated. Here we mark the component as "visible" so that genetic recalc flag
* flushing and scheduling will handle the component in a generic manner. */
if (comp_node->type == NodeType::SYNCHRONIZATION) {
comp_node->possibly_affects_visible_id = true;
comp_node->affects_visible_id = true;
}
}
}
BLI_Stack *stack = BLI_stack_new(sizeof(OperationNode *), "DEG flush layers stack");
for (OperationNode *op_node : graph->operations) {
op_node->custom_flags = 0;
op_node->num_links_pending = 0;
for (Relation *rel : op_node->outlinks) {
if ((rel->from->type == NodeType::OPERATION) && (rel->flag & RELATION_FLAG_CYCLIC) == 0) {
++op_node->num_links_pending;
}
}
if (op_node->num_links_pending == 0) {
BLI_stack_push(stack, &op_node);
op_node->custom_flags |= DEG_NODE_VISITED;
}
}
while (!BLI_stack_is_empty(stack)) {
OperationNode *op_node;
BLI_stack_pop(stack, &op_node);
/* Flush flags to parents. */
for (Relation *rel : op_node->inlinks) {
if (rel->from->type == NodeType::OPERATION) {
const OperationNode *op_to = reinterpret_cast<const OperationNode *>(rel->to);
const ComponentNode *comp_to = op_to->owner;
/* Ignore the synchronization target.
* It is always visible and should not affect on other components. */
if (comp_to->type == NodeType::SYNCHRONIZATION) {
continue;
}
OperationNode *op_from = reinterpret_cast<OperationNode *>(rel->from);
ComponentNode *comp_from = op_from->owner;
const bool target_possibly_affects_visible_id = comp_to->possibly_affects_visible_id;
const bool target_affects_visible_id = comp_to->affects_visible_id;
op_from->flag |= (op_to->flag & OperationFlag::DEPSOP_FLAG_AFFECTS_VISIBILITY);
/* Visibility component forces all components of the current ID to be considered as
* affecting directly visible. */
if (comp_from->type == NodeType::VISIBILITY) {
const IDNode *id_node_from = comp_from->owner;
if (target_possibly_affects_visible_id) {
for (ComponentNode *comp_node : id_node_from->components.values()) {
comp_node->possibly_affects_visible_id |= target_possibly_affects_visible_id;
}
}
if (target_affects_visible_id) {
for (ComponentNode *comp_node : id_node_from->components.values()) {
comp_node->affects_visible_id |= target_affects_visible_id;
}
}
}
else {
comp_from->possibly_affects_visible_id |= target_possibly_affects_visible_id;
comp_from->affects_visible_id |= target_affects_visible_id;
}
}
}
/* Schedule parent nodes. */
for (Relation *rel : op_node->inlinks) {
if (rel->from->type == NodeType::OPERATION) {
OperationNode *op_from = (OperationNode *)rel->from;
if ((rel->flag & RELATION_FLAG_CYCLIC) == 0) {
BLI_assert(op_from->num_links_pending > 0);
--op_from->num_links_pending;
}
if ((op_from->num_links_pending == 0) && (op_from->custom_flags & DEG_NODE_VISITED) == 0) {
BLI_stack_push(stack, &op_from);
op_from->custom_flags |= DEG_NODE_VISITED;
}
}
}
}
BLI_stack_free(stack);
graph->need_update_nodes_visibility = false;
}
void deg_graph_flush_visibility_flags_if_needed(Depsgraph *graph)
{
if (!graph->need_update_nodes_visibility) {
return;
}
deg_graph_flush_visibility_flags(graph);
}
} // namespace blender::deg
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