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/* SPDX-License-Identifier: GPL-2.0-or-later */
#include "BKE_mesh.h"
#include "BKE_mesh_runtime.h"
#include "DNA_mesh_types.h"
#include "DNA_meshdata_types.h"
#include "BKE_attribute_math.hh"
#include "node_geometry_util.hh"
namespace blender::nodes::node_geo_flip_faces_cc {
static void node_declare(NodeDeclarationBuilder &b)
{
b.add_input<decl::Geometry>(N_("Mesh")).supported_type(GEO_COMPONENT_TYPE_MESH);
b.add_input<decl::Bool>(N_("Selection")).default_value(true).hide_value().supports_field();
b.add_output<decl::Geometry>(N_("Mesh"));
}
static void mesh_flip_faces(Mesh &mesh, const Field<bool> &selection_field)
{
if (mesh.totpoly == 0) {
return;
}
bke::MeshFieldContext field_context{mesh, ATTR_DOMAIN_FACE};
fn::FieldEvaluator evaluator{field_context, mesh.totpoly};
evaluator.add(selection_field);
evaluator.evaluate();
const IndexMask selection = evaluator.get_evaluated_as_mask(0);
const Span<MPoly> polys = mesh.polys();
MutableSpan<MLoop> loops = mesh.loops_for_write();
for (const int i : selection.index_range()) {
const MPoly &poly = polys[selection[i]];
int start = poly.loopstart;
for (const int j : IndexRange(poly.totloop / 2)) {
const int index1 = start + j + 1;
const int index2 = start + poly.totloop - j - 1;
std::swap(loops[index1].v, loops[index2].v);
std::swap(loops[index1 - 1].e, loops[index2].e);
}
}
MutableAttributeAccessor attributes = mesh.attributes_for_write();
attributes.for_all(
[&](const bke::AttributeIDRef &attribute_id, const AttributeMetaData &meta_data) {
if (meta_data.data_type == CD_PROP_STRING) {
return true;
}
if (meta_data.domain == ATTR_DOMAIN_CORNER) {
GSpanAttributeWriter attribute = attributes.lookup_or_add_for_write_span(
attribute_id, ATTR_DOMAIN_CORNER, meta_data.data_type);
attribute_math::convert_to_static_type(meta_data.data_type, [&](auto dummy) {
using T = decltype(dummy);
MutableSpan<T> dst_span = attribute.span.typed<T>();
for (const int j : selection.index_range()) {
const MPoly &poly = polys[selection[j]];
dst_span.slice(poly.loopstart + 1, poly.totloop - 1).reverse();
}
});
attribute.finish();
}
return true;
});
}
static void node_geo_exec(GeoNodeExecParams params)
{
GeometrySet geometry_set = params.extract_input<GeometrySet>("Mesh");
const Field<bool> selection_field = params.extract_input<Field<bool>>("Selection");
geometry_set.modify_geometry_sets([&](GeometrySet &geometry_set) {
if (Mesh *mesh = geometry_set.get_mesh_for_write()) {
mesh_flip_faces(*mesh, selection_field);
}
});
params.set_output("Mesh", std::move(geometry_set));
}
} // namespace blender::nodes::node_geo_flip_faces_cc
void register_node_type_geo_flip_faces()
{
namespace file_ns = blender::nodes::node_geo_flip_faces_cc;
static bNodeType ntype;
geo_node_type_base(&ntype, GEO_NODE_FLIP_FACES, "Flip Faces", NODE_CLASS_GEOMETRY);
ntype.geometry_node_execute = file_ns::node_geo_exec;
ntype.declare = file_ns::node_declare;
nodeRegisterType(&ntype);
}
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