120 lines
4.0 KiB
C++
120 lines
4.0 KiB
C++
/*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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*/
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#include "BKE_anonymous_attribute.hh"
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using namespace blender::bke;
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/**
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* A struct that identifies an attribute. It's lifetime is managed by an atomic reference count.
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*
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* Additionally, this struct can be strongly or weakly owned. The difference is that strong
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* ownership means that attributes with this id will be kept around. Weak ownership just makes sure
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* that the struct itself stays alive, but corresponding attributes might still be removed
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* automatically.
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*/
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struct AnonymousAttributeID {
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/**
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* Total number of references to this attribute id. Once this reaches zero, the struct can be
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* freed. This includes strong and weak references.
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*/
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mutable std::atomic<int> refcount_tot = 0;
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/**
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* Number of strong references to this attribute id. When this is zero, the corresponding
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* attributes can be removed from geometries automatically.
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*/
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mutable std::atomic<int> refcount_strong = 0;
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/**
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* Only used to identify this struct in a debugging session.
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*/
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std::string debug_name;
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/**
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* Unique name of the this attribute id during the current session.
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*/
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std::string internal_name;
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};
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/** Every time this function is called, it outputs a different name. */
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static std::string get_new_internal_name()
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{
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static std::atomic<int> index = 0;
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const int next_index = index.fetch_add(1);
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return "anonymous_attribute_" + std::to_string(next_index);
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}
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AnonymousAttributeID *BKE_anonymous_attribute_id_new_weak(const char *debug_name)
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{
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AnonymousAttributeID *anonymous_id = new AnonymousAttributeID();
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anonymous_id->debug_name = debug_name;
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anonymous_id->internal_name = get_new_internal_name();
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anonymous_id->refcount_tot.store(1);
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return anonymous_id;
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}
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AnonymousAttributeID *BKE_anonymous_attribute_id_new_strong(const char *debug_name)
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{
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AnonymousAttributeID *anonymous_id = new AnonymousAttributeID();
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anonymous_id->debug_name = debug_name;
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anonymous_id->internal_name = get_new_internal_name();
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anonymous_id->refcount_tot.store(1);
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anonymous_id->refcount_strong.store(1);
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return anonymous_id;
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}
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bool BKE_anonymous_attribute_id_has_strong_references(const AnonymousAttributeID *anonymous_id)
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{
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return anonymous_id->refcount_strong.load() >= 1;
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}
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void BKE_anonymous_attribute_id_increment_weak(const AnonymousAttributeID *anonymous_id)
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{
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anonymous_id->refcount_tot.fetch_add(1);
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}
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void BKE_anonymous_attribute_id_increment_strong(const AnonymousAttributeID *anonymous_id)
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{
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anonymous_id->refcount_tot.fetch_add(1);
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anonymous_id->refcount_strong.fetch_add(1);
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}
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void BKE_anonymous_attribute_id_decrement_weak(const AnonymousAttributeID *anonymous_id)
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{
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const int new_refcount = anonymous_id->refcount_tot.fetch_sub(1) - 1;
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if (new_refcount == 0) {
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BLI_assert(anonymous_id->refcount_strong == 0);
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delete anonymous_id;
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}
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}
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void BKE_anonymous_attribute_id_decrement_strong(const AnonymousAttributeID *anonymous_id)
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{
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anonymous_id->refcount_strong.fetch_sub(1);
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BKE_anonymous_attribute_id_decrement_weak(anonymous_id);
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}
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const char *BKE_anonymous_attribute_id_debug_name(const AnonymousAttributeID *anonymous_id)
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{
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return anonymous_id->debug_name.c_str();
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}
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const char *BKE_anonymous_attribute_id_internal_name(const AnonymousAttributeID *anonymous_id)
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{
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return anonymous_id->internal_name.c_str();
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}
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