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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 "DNA_mesh_types.h"
#include "DNA_meshdata_types.h"
#include "bmesh.h"
#include "bmesh_tools.h"
#include "node_geometry_util.hh"
namespace blender::nodes::node_geo_unsubdivide {
static void node_declare(NodeDeclarationBuilder &b)
{
b.add_input<decl::Geometry>(N_("Mesh")).supported_type(GEO_COMPONENT_TYPE_MESH);
b.add_input<decl::Int>(N_("Iterations")).default_value(1).min(0).max(10);
b.add_input<decl::Bool>(N_("Selection")).default_value(true).supports_field().hide_value();
b.add_output<decl::Geometry>(N_("Mesh"));
}
static Mesh *unsubdivide_mesh(const int iterations, const IndexMask selection, const Mesh *mesh)
{
const BMeshCreateParams bmesh_create_params = {0};
const BMeshFromMeshParams bmesh_from_mesh_params = {
true, 0, 0, 0, {CD_MASK_ORIGINDEX, CD_MASK_ORIGINDEX, CD_MASK_ORIGINDEX}};
BMesh *bm = BKE_mesh_to_bmesh_ex(mesh, &bmesh_create_params, &bmesh_from_mesh_params);
BM_mesh_elem_table_ensure(bm, BM_VERT);
for (int i_point : selection) {
BM_elem_flag_set(BM_vert_at_index(bm, i_point), BM_ELEM_TAG, true);
}
BM_mesh_decimate_unsubdivide_ex(bm, iterations, true);
Mesh *result = BKE_mesh_from_bmesh_for_eval_nomain(bm, NULL, mesh);
BM_mesh_free(bm);
result->runtime.cd_dirty_vert |= CD_MASK_NORMAL;
return result;
}
static void node_geo_exec(GeoNodeExecParams params)
{
GeometrySet geometry_set = params.extract_input<GeometrySet>("Mesh");
const int iterations = params.extract_input<int>("Iterations");
if (iterations > 0 && geometry_set.has_mesh()) {
const MeshComponent &mesh_component = geometry_set.get_component_for_write<MeshComponent>();
const Mesh *input_mesh = mesh_component.get_for_read();
Field<bool> selection_field = params.extract_input<Field<bool>>("Selection");
const int domain_size = mesh_component.attribute_domain_size(ATTR_DOMAIN_POINT);
GeometryComponentFieldContext context{mesh_component, ATTR_DOMAIN_POINT};
FieldEvaluator evaluator{context, domain_size};
evaluator.add(selection_field);
evaluator.evaluate();
const IndexMask selection = evaluator.get_evaluated_as_mask(0);
geometry_set.modify_geometry_sets([&](GeometrySet &geometry_set) {
Mesh *result = unsubdivide_mesh(iterations, selection, input_mesh);
if (result != input_mesh) {
geometry_set.replace_mesh(result);
}
});
}
params.set_output("Mesh", std::move(geometry_set));
}
} // namespace blender::nodes::node_geo_unsubdivide
void register_node_type_geo_unsubdivide()
{
namespace file_ns = blender::nodes::node_geo_unsubdivide;
static bNodeType ntype;
geo_node_type_base(&ntype, GEO_NODE_UNSUBDIVIDE, "Unsubdivide", NODE_CLASS_GEOMETRY);
ntype.declare = file_ns::node_declare;
ntype.geometry_node_execute = file_ns::node_geo_exec;
nodeRegisterType(&ntype);
}
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