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/* SPDX-License-Identifier: GPL-2.0-or-later */
#include "BKE_collection.h"
#include "BKE_geometry_set_instances.hh"
#include "BKE_material.h"
#include "BKE_mesh.h"
#include "BKE_mesh_wrapper.h"
#include "BKE_modifier.h"
#include "BKE_pointcloud.h"
#include "DNA_collection_types.h"
#include "DNA_layer_types.h"
#include "DNA_mesh_types.h"
#include "DNA_meshdata_types.h"
#include "DNA_object_types.h"
#include "DNA_pointcloud_types.h"
namespace blender::bke {
static void geometry_set_collect_recursive(const GeometrySet &geometry_set,
const float4x4 &transform,
Vector<GeometryInstanceGroup> &r_sets);
static void geometry_set_collect_recursive_collection(const Collection &collection,
const float4x4 &transform,
Vector<GeometryInstanceGroup> &r_sets);
static void add_final_mesh_as_geometry_component(const Object &object, GeometrySet &geometry_set)
{
Mesh *mesh = BKE_modifier_get_evaluated_mesh_from_evaluated_object(
&const_cast<Object &>(object));
if (mesh != nullptr) {
BKE_mesh_wrapper_ensure_mdata(mesh);
geometry_set.replace_mesh(mesh, GeometryOwnershipType::ReadOnly);
}
}
GeometrySet object_get_evaluated_geometry_set(const Object &object)
{
if (object.type == OB_MESH && object.mode == OB_MODE_EDIT) {
GeometrySet geometry_set;
if (object.runtime.geometry_set_eval != nullptr) {
/* `geometry_set_eval` only contains non-mesh components, see `editbmesh_build_data`. */
geometry_set = *object.runtime.geometry_set_eval;
}
add_final_mesh_as_geometry_component(object, geometry_set);
return geometry_set;
}
if (object.runtime.geometry_set_eval != nullptr) {
GeometrySet geometry_set = *object.runtime.geometry_set_eval;
/* Ensure that subdivision is performed on the CPU. */
if (geometry_set.has_mesh()) {
add_final_mesh_as_geometry_component(object, geometry_set);
}
return geometry_set;
}
/* Otherwise, construct a new geometry set with the component based on the object type. */
if (object.type == OB_MESH) {
GeometrySet geometry_set;
add_final_mesh_as_geometry_component(object, geometry_set);
return geometry_set;
}
if (object.type == OB_EMPTY && object.instance_collection != nullptr) {
GeometrySet geometry_set;
Collection &collection = *object.instance_collection;
InstancesComponent &instances = geometry_set.get_component_for_write<InstancesComponent>();
const int handle = instances.add_reference(collection);
instances.add_instance(handle, float4x4::identity());
return geometry_set;
}
/* Return by value since there is not always an existing geometry set owned elsewhere to use. */
return {};
}
static void geometry_set_collect_recursive_collection_instance(
const Collection &collection, const float4x4 &transform, Vector<GeometryInstanceGroup> &r_sets)
{
float4x4 offset_matrix = float4x4::identity();
sub_v3_v3(offset_matrix.values[3], collection.instance_offset);
const float4x4 instance_transform = transform * offset_matrix;
geometry_set_collect_recursive_collection(collection, instance_transform, r_sets);
}
static void geometry_set_collect_recursive_object(const Object &object,
const float4x4 &transform,
Vector<GeometryInstanceGroup> &r_sets)
{
GeometrySet instance_geometry_set = object_get_evaluated_geometry_set(object);
geometry_set_collect_recursive(instance_geometry_set, transform, r_sets);
}
static void geometry_set_collect_recursive_collection(const Collection &collection,
const float4x4 &transform,
Vector<GeometryInstanceGroup> &r_sets)
{
LISTBASE_FOREACH (const CollectionObject *, collection_object, &collection.gobject) {
BLI_assert(collection_object->ob != nullptr);
const Object &object = *collection_object->ob;
const float4x4 object_transform = transform * object.obmat;
geometry_set_collect_recursive_object(object, object_transform, r_sets);
}
LISTBASE_FOREACH (const CollectionChild *, collection_child, &collection.children) {
BLI_assert(collection_child->collection != nullptr);
const Collection &collection = *collection_child->collection;
geometry_set_collect_recursive_collection(collection, transform, r_sets);
}
}
static void geometry_set_collect_recursive(const GeometrySet &geometry_set,
const float4x4 &transform,
Vector<GeometryInstanceGroup> &r_sets)
{
r_sets.append({geometry_set, {transform}});
if (geometry_set.has_instances()) {
const InstancesComponent &instances_component =
*geometry_set.get_component_for_read<InstancesComponent>();
Span<float4x4> transforms = instances_component.instance_transforms();
Span<int> handles = instances_component.instance_reference_handles();
Span<InstanceReference> references = instances_component.references();
for (const int i : transforms.index_range()) {
const InstanceReference &reference = references[handles[i]];
const float4x4 instance_transform = transform * transforms[i];
switch (reference.type()) {
case InstanceReference::Type::Object: {
Object &object = reference.object();
geometry_set_collect_recursive_object(object, instance_transform, r_sets);
break;
}
case InstanceReference::Type::Collection: {
Collection &collection = reference.collection();
geometry_set_collect_recursive_collection_instance(
collection, instance_transform, r_sets);
break;
}
case InstanceReference::Type::GeometrySet: {
const GeometrySet &geometry_set = reference.geometry_set();
geometry_set_collect_recursive(geometry_set, instance_transform, r_sets);
break;
}
case InstanceReference::Type::None: {
break;
}
}
}
}
}
void geometry_set_gather_instances(const GeometrySet &geometry_set,
Vector<GeometryInstanceGroup> &r_instance_groups)
{
geometry_set_collect_recursive(geometry_set, float4x4::identity(), r_instance_groups);
}
} // namespace blender::bke
void InstancesComponent::foreach_referenced_geometry(
blender::FunctionRef<void(const GeometrySet &geometry_set)> callback) const
{
using namespace blender::bke;
for (const InstanceReference &reference : references_) {
switch (reference.type()) {
case InstanceReference::Type::Object: {
const Object &object = reference.object();
const GeometrySet object_geometry_set = object_get_evaluated_geometry_set(object);
callback(object_geometry_set);
break;
}
case InstanceReference::Type::Collection: {
Collection &collection = reference.collection();
FOREACH_COLLECTION_OBJECT_RECURSIVE_BEGIN (&collection, object) {
const GeometrySet object_geometry_set = object_get_evaluated_geometry_set(*object);
callback(object_geometry_set);
}
FOREACH_COLLECTION_OBJECT_RECURSIVE_END;
break;
}
case InstanceReference::Type::GeometrySet: {
const GeometrySet &instance_geometry_set = reference.geometry_set();
callback(instance_geometry_set);
break;
}
case InstanceReference::Type::None: {
break;
}
}
}
}
void InstancesComponent::ensure_geometry_instances()
{
using namespace blender;
using namespace blender::bke;
VectorSet<InstanceReference> new_references;
new_references.reserve(references_.size());
for (const InstanceReference &reference : references_) {
switch (reference.type()) {
case InstanceReference::Type::None:
case InstanceReference::Type::GeometrySet: {
/* Those references can stay as their were. */
new_references.add_new(reference);
break;
}
case InstanceReference::Type::Object: {
/* Create a new reference that contains the geometry set of the object. We may want to
* treat e.g. lamps and similar object types separately here. */
const Object &object = reference.object();
GeometrySet object_geometry_set = object_get_evaluated_geometry_set(object);
if (object_geometry_set.has_instances()) {
InstancesComponent &component =
object_geometry_set.get_component_for_write<InstancesComponent>();
component.ensure_geometry_instances();
}
new_references.add_new(std::move(object_geometry_set));
break;
}
case InstanceReference::Type::Collection: {
/* Create a new reference that contains a geometry set that contains all objects from the
* collection as instances. */
GeometrySet collection_geometry_set;
InstancesComponent &component =
collection_geometry_set.get_component_for_write<InstancesComponent>();
Collection &collection = reference.collection();
FOREACH_COLLECTION_OBJECT_RECURSIVE_BEGIN (&collection, object) {
const int handle = component.add_reference(*object);
component.add_instance(handle, object->obmat);
float4x4 &transform = component.instance_transforms().last();
sub_v3_v3(transform.values[3], collection.instance_offset);
}
FOREACH_COLLECTION_OBJECT_RECURSIVE_END;
component.ensure_geometry_instances();
new_references.add_new(std::move(collection_geometry_set));
break;
}
}
}
references_ = std::move(new_references);
}
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