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/* SPDX-License-Identifier: GPL-2.0-or-later */
#include "DNA_mesh_types.h"
#include "DNA_meshdata_types.h"
#include "BKE_mesh.h"
#include "node_geometry_util.hh"
namespace blender::nodes::node_geo_input_mesh_face_area_cc {
static void node_declare(NodeDeclarationBuilder &b)
{
b.add_output<decl::Float>(N_("Area"))
.field_source()
.description(N_("The surface area of each of the mesh's faces"));
}
static VArray<float> construct_face_area_varray(const Mesh &mesh, const eAttrDomain domain)
{
const Span<float3> positions = mesh.positions();
const Span<MPoly> polys = mesh.polys();
const Span<MLoop> loops = mesh.loops();
auto area_fn = [positions, polys, loops](const int i) -> float {
const MPoly &poly = polys[i];
return BKE_mesh_calc_poly_area(
&poly, &loops[poly.loopstart], reinterpret_cast<const float(*)[3]>(positions.data()));
};
return mesh.attributes().adapt_domain<float>(
VArray<float>::ForFunc(polys.size(), area_fn), ATTR_DOMAIN_FACE, domain);
}
class FaceAreaFieldInput final : public bke::MeshFieldInput {
public:
FaceAreaFieldInput() : bke::MeshFieldInput(CPPType::get<float>(), "Face Area Field")
{
category_ = Category::Generated;
}
GVArray get_varray_for_context(const Mesh &mesh,
const eAttrDomain domain,
const IndexMask /*mask*/) const final
{
return construct_face_area_varray(mesh, domain);
}
uint64_t hash() const override
{
/* Some random constant hash. */
return 1346334523;
}
bool is_equal_to(const fn::FieldNode &other) const override
{
return dynamic_cast<const FaceAreaFieldInput *>(&other) != nullptr;
}
std::optional<eAttrDomain> preferred_domain(const Mesh & /*mesh*/) const override
{
return ATTR_DOMAIN_FACE;
}
};
static void node_geo_exec(GeoNodeExecParams params)
{
params.set_output("Area", Field<float>(std::make_shared<FaceAreaFieldInput>()));
}
} // namespace blender::nodes::node_geo_input_mesh_face_area_cc
void register_node_type_geo_input_mesh_face_area()
{
namespace file_ns = blender::nodes::node_geo_input_mesh_face_area_cc;
static bNodeType ntype;
geo_node_type_base(&ntype, GEO_NODE_INPUT_MESH_FACE_AREA, "Face Area", NODE_CLASS_INPUT);
ntype.declare = file_ns::node_declare;
ntype.geometry_node_execute = file_ns::node_geo_exec;
nodeRegisterType(&ntype);
}
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