1c3e0f3585
The runtime backup/restore logic was slightly wrong: it is possible that an object requires light linking runtime but does not need light linking itself. This is typical configuration for the receivers/blockers. Modified the logic so that the evaluated object light linking is allocated if there was a runtime field needed. This required to make it so light linking evaluation takes care of feeing the light_linking if it is empty. The downside of this approach is a redundant allocation from the object backup when removing light linking collection from emitter. But this is not a typical evaluation flow, and the more typical flows are cheap with this approach. Pull Request: https://projects.blender.org/blender/blender/pulls/108261
110 lines
4.9 KiB
C
110 lines
4.9 KiB
C
/* SPDX-License-Identifier: GPL-2.0-or-later
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* Copyright 2001-2023 Blender Foundation */
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#pragma once
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/** \file
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* \ingroup bke
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*
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* API to manage light linking.
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*/
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#include "DNA_collection_types.h" /* eCollectionLightLinkingState */
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#ifdef __cplusplus
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extern "C" {
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#endif
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struct ID;
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struct Main;
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struct Object;
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struct Collection;
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struct ReportList;
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struct Scene;
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struct ViewLayer;
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typedef enum LightLinkingType {
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LIGHT_LINKING_RECEIVER,
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LIGHT_LINKING_BLOCKER,
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} LightLinkingType;
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/* Free object's light_linking if it is not needed to hold any of collections. */
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void BKE_light_linking_free_if_empty(struct Object *object);
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/* Get a collection of the given light linking type of the given object. */
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struct Collection *BKE_light_linking_collection_get(const struct Object *object,
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LightLinkingType link_type);
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/* Create new collection and assign it as a light or shadow linking collection (denoted by the
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* link_type) of the given object.
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*
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* The collection is created outside of the view layer collections.
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* If the object already has light linking collection set up it is unreferenced from the object.
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*
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* Returns the newly created collection. */
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struct Collection *BKE_light_linking_collection_new(struct Main *bmain,
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struct Object *object,
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LightLinkingType link_type);
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/* Assign given light or shadow linking collection (denoted by the link_type) to the given object.
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* Maintains user counters of the collection: old collection is decreased the user counter, the new
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* one is increased after this call.
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* The new_collection is allowed to be null pointer.
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*
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* The assign_only variant takes care of (re)assigning the collection and maintaining the user
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* counter, but not the dependency graph tagging for update. */
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void BKE_light_linking_collection_assign_only(struct Object *object,
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struct Collection *new_collection,
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LightLinkingType link_type);
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void BKE_light_linking_collection_assign(struct Main *bmain,
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struct Object *object,
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struct Collection *new_collection,
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LightLinkingType link_type);
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/* Add receiver to the given light linking collection.
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* The ID is expected to either be collection or an object. Passing other types of IDs has no
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* effect */
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void BKE_light_linking_add_receiver_to_collection(struct Main *bmain,
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struct Collection *collection,
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struct ID *receiver,
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const eCollectionLightLinkingState link_state);
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/* Remove the given ID from the light or shadow linking collection of the given object.
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*
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* The collection is expected to be either receiver_collection or blocker_collection from an
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* emitter object.
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*
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* The ID is expected to either be collection or an object. If other ID type is passed to the
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* function an error is reported and false is returned.
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*
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* Returns true if the ID was unlinked from the receiver collection, false otherwise. The unlinking
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* will be unsuccessful if, for example, the receiver collection is a linked data-block.
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*
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* The optional reports argument is used to provide human-readable details about why unlinking was
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* not successful. If it is nullptr then the report is printed to the console. */
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bool BKE_light_linking_unlink_id_from_collection(struct Main *bmain,
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struct Collection *collection,
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struct ID *id,
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struct ReportList *reports);
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/* Link receiver object to the given emitter.
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*
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* If the emitter already has light linking collection specified the object is added to that
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* collection. Otherwise, first a new collection is created and assigned, and the receiver is added
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* to it. */
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void BKE_light_linking_link_receiver_to_emitter(struct Main *bmain,
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struct Object *emitter,
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struct Object *receiver,
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LightLinkingType link_type,
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eCollectionLightLinkingState link_state);
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/* Select all objects which are linked to the given emitter via the given light link type. */
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void BKE_light_linking_select_receivers_of_emitter(struct Scene *scene,
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struct ViewLayer *view_layer,
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struct Object *emitter,
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LightLinkingType link_type);
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#ifdef __cplusplus
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}
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#endif
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