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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) 2018 Blender Foundation.
* All rights reserved.
*/
/** \file
* \ingroup depsgraph
*
* Physics utilities for effectors and collision.
*/
#include "intern/depsgraph_physics.h"
#include "MEM_guardedalloc.h"
#include "BLI_compiler_compat.h"
#include "BLI_listbase.h"
#include "BKE_collision.h"
#include "BKE_effect.h"
#include "BKE_modifier.h"
#include "DNA_collection_types.h"
#include "DNA_object_force_types.h"
#include "DNA_object_types.h"
#include "DEG_depsgraph_build.h"
#include "DEG_depsgraph_physics.h"
#include "DEG_depsgraph_query.h"
#include "depsgraph.h"
namespace deg = blender::deg;
/*************************** Evaluation Query API *****************************/
static ePhysicsRelationType modifier_to_relation_type(unsigned int modifier_type)
{
switch (modifier_type) {
case eModifierType_Collision:
return DEG_PHYSICS_COLLISION;
case eModifierType_Fluid:
return DEG_PHYSICS_SMOKE_COLLISION;
case eModifierType_DynamicPaint:
return DEG_PHYSICS_DYNAMIC_BRUSH;
}
BLI_assert(!"Unknown collision modifier type");
return DEG_PHYSICS_RELATIONS_NUM;
}
ListBase *DEG_get_effector_relations(const Depsgraph *graph, Collection *collection)
{
const deg::Depsgraph *deg_graph = reinterpret_cast<const deg::Depsgraph *>(graph);
if (deg_graph->physics_relations[DEG_PHYSICS_EFFECTOR] == nullptr) {
return nullptr;
}
ID *collection_orig = DEG_get_original_id(&collection->id);
return deg_graph->physics_relations[DEG_PHYSICS_EFFECTOR]->lookup_default(collection_orig,
nullptr);
}
ListBase *DEG_get_collision_relations(const Depsgraph *graph,
Collection *collection,
unsigned int modifier_type)
{
const deg::Depsgraph *deg_graph = reinterpret_cast<const deg::Depsgraph *>(graph);
const ePhysicsRelationType type = modifier_to_relation_type(modifier_type);
if (deg_graph->physics_relations[type] == nullptr) {
return nullptr;
}
ID *collection_orig = DEG_get_original_id(&collection->id);
return deg_graph->physics_relations[type]->lookup_default(collection_orig, nullptr);
}
/********************** Depsgraph Building API ************************/
void DEG_add_collision_relations(DepsNodeHandle *handle,
Object *object,
Collection *collection,
unsigned int modifier_type,
DEG_CollobjFilterFunction filter_function,
const char *name)
{
Depsgraph *depsgraph = DEG_get_graph_from_handle(handle);
deg::Depsgraph *deg_graph = (deg::Depsgraph *)depsgraph;
ListBase *relations = build_collision_relations(deg_graph, collection, modifier_type);
LISTBASE_FOREACH (CollisionRelation *, relation, relations) {
Object *ob1 = relation->ob;
if (ob1 == object) {
continue;
}
if (filter_function == nullptr ||
filter_function(ob1, BKE_modifiers_findby_type(ob1, (ModifierType)modifier_type))) {
DEG_add_object_pointcache_relation(handle, ob1, DEG_OB_COMP_TRANSFORM, name);
DEG_add_object_pointcache_relation(handle, ob1, DEG_OB_COMP_GEOMETRY, name);
}
}
}
void DEG_add_forcefield_relations(DepsNodeHandle *handle,
Object *object,
EffectorWeights *effector_weights,
bool add_absorption,
int skip_forcefield,
const char *name)
{
Depsgraph *depsgraph = DEG_get_graph_from_handle(handle);
deg::Depsgraph *deg_graph = (deg::Depsgraph *)depsgraph;
ListBase *relations = build_effector_relations(deg_graph, effector_weights->group);
LISTBASE_FOREACH (EffectorRelation *, relation, relations) {
if (relation->ob == object) {
continue;
}
if (relation->pd->forcefield == skip_forcefield) {
continue;
}
/* Relation to forcefield object, optionally including geometry.
* Use special point cache relations for automatic cache clearing. */
DEG_add_object_pointcache_relation(handle, relation->ob, DEG_OB_COMP_TRANSFORM, name);
if (relation->psys || ELEM(relation->pd->shape, PFIELD_SHAPE_SURFACE, PFIELD_SHAPE_POINTS) ||
relation->pd->forcefield == PFIELD_GUIDE) {
/* TODO(sergey): Consider going more granular with more dedicated
* particle system operation. */
DEG_add_object_pointcache_relation(handle, relation->ob, DEG_OB_COMP_GEOMETRY, name);
}
/* Smoke flow relations. */
if (relation->pd->forcefield == PFIELD_FLUIDFLOW && relation->pd->f_source != nullptr) {
DEG_add_object_pointcache_relation(
handle, relation->pd->f_source, DEG_OB_COMP_TRANSFORM, "Fluid Force Domain");
DEG_add_object_pointcache_relation(
handle, relation->pd->f_source, DEG_OB_COMP_GEOMETRY, "Fluid Force Domain");
}
/* Absorption forces need collision relation. */
if (add_absorption && (relation->pd->flag & PFIELD_VISIBILITY)) {
DEG_add_collision_relations(
handle, object, nullptr, eModifierType_Collision, nullptr, "Force Absorption");
}
}
}
/******************************** Internal API ********************************/
namespace blender {
namespace deg {
ListBase *build_effector_relations(Depsgraph *graph, Collection *collection)
{
Map<const ID *, ListBase *> *hash = graph->physics_relations[DEG_PHYSICS_EFFECTOR];
if (hash == nullptr) {
graph->physics_relations[DEG_PHYSICS_EFFECTOR] = new Map<const ID *, ListBase *>();
hash = graph->physics_relations[DEG_PHYSICS_EFFECTOR];
}
return hash->lookup_or_add_cb(&collection->id, [&]() {
::Depsgraph *depsgraph = reinterpret_cast<::Depsgraph *>(graph);
return BKE_effector_relations_create(depsgraph, graph->view_layer, collection);
});
}
ListBase *build_collision_relations(Depsgraph *graph,
Collection *collection,
unsigned int modifier_type)
{
const ePhysicsRelationType type = modifier_to_relation_type(modifier_type);
Map<const ID *, ListBase *> *hash = graph->physics_relations[type];
if (hash == nullptr) {
graph->physics_relations[type] = new Map<const ID *, ListBase *>();
hash = graph->physics_relations[type];
}
return hash->lookup_or_add_cb(&collection->id, [&]() {
::Depsgraph *depsgraph = reinterpret_cast<::Depsgraph *>(graph);
return BKE_collision_relations_create(depsgraph, collection, modifier_type);
});
}
void clear_physics_relations(Depsgraph *graph)
{
for (int i = 0; i < DEG_PHYSICS_RELATIONS_NUM; i++) {
Map<const ID *, ListBase *> *hash = graph->physics_relations[i];
if (hash) {
const ePhysicsRelationType type = (ePhysicsRelationType)i;
switch (type) {
case DEG_PHYSICS_EFFECTOR:
for (ListBase *list : hash->values()) {
BKE_effector_relations_free(list);
}
break;
case DEG_PHYSICS_COLLISION:
case DEG_PHYSICS_SMOKE_COLLISION:
case DEG_PHYSICS_DYNAMIC_BRUSH:
for (ListBase *list : hash->values()) {
BKE_collision_relations_free(list);
}
break;
case DEG_PHYSICS_RELATIONS_NUM:
break;
}
delete hash;
graph->physics_relations[i] = nullptr;
}
}
}
} // namespace deg
} // namespace blender
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