Differential D9876 Diff 32105 source/blender/nodes/geometry/nodes/node_geo_point_separate.cc

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source/blender/nodes/geometry/nodes/node_geo_point_separate.cc

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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.
				*/

				#include "BKE_mesh.h"
				#include "BKE_persistent_data_handle.hh"
				#include "BKE_pointcloud.h"

				#include "DNA_mesh_types.h"
				#include "DNA_meshdata_types.h"
				#include "DNA_pointcloud_types.h"

				#include "node_geometry_util.hh"

				static bNodeSocketTemplate geo_node_point_instance_in[] = {
				{SOCK_GEOMETRY, N_("Geometry")},
				{SOCK_STRING, N_("Mask")},
				{-1, ""},
				};

				static bNodeSocketTemplate geo_node_point_instance_out[] = {
				{SOCK_GEOMETRY, N_("Geometry 1")},
				{SOCK_GEOMETRY, N_("Geometry 2")},
				{-1, ""},
				};

				namespace blender::nodes {

				static void fill_new_attribute_from_input(ReadAttributePtr input_attribute,
				WriteAttributePtr out_attribute_a,
				WriteAttributePtr out_attribute_b,
				Span<bool> a_or_b)
				{
				fn::GSpan in_span = input_attribute->get_span();
				int i_a = 0;
				int i_b = 0;
				for (int i_in = 0; i_in < in_span.size(); i_in++) {
				const bool move_to_b = a_or_b[i_in];
				if (move_to_b) {
				out_attribute_b->set(i_b, in_span[i_in]);
				i_b++;
				}
				else {
				out_attribute_a->set(i_a, in_span[i_in]);
				i_a++;
				}
				}
				}

				/**
				* Move the original attribute values to the two output components.
				*
				* \note This assumes a consistent ordering of indices before and after the split,
				* which is true for points and a simple vertex array.
				*/
				static void move_split_attributes(const GeometryComponent &in_component,
				GeometryComponent &out_component_a,
				GeometryComponent &out_component_b,
				Span<bool> a_or_b)
				{
				Set<std::string> attribute_names = in_component.attribute_names();

				for (const std::string &name : attribute_names) {
				ReadAttributePtr attribute = in_component.attribute_try_get_for_read(name);
				BLI_assert(attribute);

				/* Since this node only creates points and vertices, don't copy other attributes. */
				if (attribute->domain() != ATTR_DOMAIN_POINT) {
				continue;
				}

				const CustomDataType data_type = bke::cpp_type_to_custom_data_type(attribute->cpp_type());
				const AttributeDomain domain = attribute->domain();

				/* Don't try to create the attribute on the new component if it already exists. Built-in
				* attributes will already exist on new components by definition. It should always be possible
				* to recreate the attribute on the same component type. Also, if one of the new components
				* has the attribute the other one should have it too, but check independently to be safe. */
				if (!out_component_a.attribute_exists(name)) {
				if (!out_component_a.attribute_try_create(name, domain, data_type)) {
				BLI_assert(false);
				continue;
				}
				}
				if (!out_component_b.attribute_exists(name)) {
				if (!out_component_b.attribute_try_create(name, domain, data_type)) {
				BLI_assert(false);
				continue;
				}
				}

				WriteAttributePtr out_attribute_a = out_component_a.attribute_try_get_for_write(name);
				WriteAttributePtr out_attribute_b = out_component_b.attribute_try_get_for_write(name);
				if (!out_attribute_a \|\| !out_attribute_b) {
				BLI_assert(false);
				continue;
				}

				fill_new_attribute_from_input(
				std::move(attribute), std::move(out_attribute_a), std::move(out_attribute_b), a_or_b);
				}
				}

				/**
				* Find total in each new set and find which of the output sets each point will belong to.
				*/
				static Array<bool> count_point_splits(const GeometryComponent &component,
				const GeoNodeExecParams &params,
				int *r_a_total,
				int *r_b_total)
				{
				const BooleanReadAttribute mask_attribute = params.get_input_attribute<bool>(
				"Mask", component, ATTR_DOMAIN_POINT, false);
				Array<bool> masks = mask_attribute.get_span();
				const int in_total = masks.size();

				*r_b_total = 0;
				for (const bool mask : masks) {
				if (mask) {
				*r_b_total += 1;
				}
				}
				r_a_total = in_total - r_b_total;

				return masks;
				}

				static void separate_mesh(const MeshComponent &in_component,
				const GeoNodeExecParams &params,
				MeshComponent &out_component_a,
				MeshComponent &out_component_b)
				{
				const int size = in_component.attribute_domain_size(ATTR_DOMAIN_POINT);
				if (size == 0) {
				return;
				}

				int a_total;
				int b_total;
				Array<bool> a_or_b = count_point_splits(in_component, params, &a_total, &b_total);

				out_component_a.replace(BKE_mesh_new_nomain(a_total, 0, 0, 0, 0));
				out_component_b.replace(BKE_mesh_new_nomain(b_total, 0, 0, 0, 0));

				move_split_attributes(in_component, out_component_a, out_component_b, a_or_b.as_span());
				}

				static void separate_point_cloud(const PointCloudComponent &in_component,
				const GeoNodeExecParams &params,
				PointCloudComponent &out_component_a,
				PointCloudComponent &out_component_b)
				{
				const int size = in_component.attribute_domain_size(ATTR_DOMAIN_POINT);
				if (size == 0) {
				return;
				}

				int a_total;
				int b_total;
				Array<bool> a_or_b = count_point_splits(in_component, params, &a_total, &b_total);

				out_component_a.replace(BKE_pointcloud_new_nomain(a_total));
				out_component_b.replace(BKE_pointcloud_new_nomain(b_total));

				move_split_attributes(in_component, out_component_a, out_component_b, a_or_b.as_span());
				}

				static void geo_node_point_separate_exec(GeoNodeExecParams params)
				{
				GeometrySet geometry_set = params.extract_input<GeometrySet>("Geometry");
				GeometrySet out_set_a(geometry_set);
				GeometrySet out_set_b;

				if (geometry_set.has<PointCloudComponent>()) {
				separate_point_cloud(*geometry_set.get_component_for_read<PointCloudComponent>(),
				params,
				out_set_a.get_component_for_write<PointCloudComponent>(),
				out_set_b.get_component_for_write<PointCloudComponent>());
				}
				if (geometry_set.has<MeshComponent>()) {
				separate_mesh(*geometry_set.get_component_for_read<MeshComponent>(),
				params,
				out_set_a.get_component_for_write<MeshComponent>(),
				out_set_b.get_component_for_write<MeshComponent>());
				}

				params.set_output("Geometry 1", std::move(out_set_a));
				params.set_output("Geometry 2", std::move(out_set_b));
				}
				} // namespace blender::nodes

				void register_node_type_geo_point_separate()
				{
				static bNodeType ntype;

				geo_node_type_base(&ntype, GEO_NODE_POINT_SEPARATE, "Point Separate", NODE_CLASS_GEOMETRY, 0);
				node_type_socket_templates(&ntype, geo_node_point_instance_in, geo_node_point_instance_out);
				ntype.geometry_node_execute = blender::nodes::geo_node_point_separate_exec;
				nodeRegisterType(&ntype);
				}