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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 "node_geometry_util.hh"
#include "BKE_spline.hh"
namespace blender::nodes {
static void geo_node_input_spline_length_declare(NodeDeclarationBuilder &b)
{
b.add_output<decl::Float>(N_("Length")).field_source();
}
static VArray<float> construct_spline_length_gvarray(const CurveComponent &component,
const AttributeDomain domain,
ResourceScope &UNUSED(scope))
{
const CurveEval *curve = component.get_for_read();
if (curve == nullptr) {
return {};
}
Span<SplinePtr> splines = curve->splines();
auto length_fn = [splines](int i) { return splines[i]->length(); };
if (domain == ATTR_DOMAIN_CURVE) {
return VArray<float>::ForFunc(splines.size(), length_fn);
}
if (domain == ATTR_DOMAIN_POINT) {
VArray<float> length = VArray<float>::ForFunc(splines.size(), length_fn);
return component.attribute_try_adapt_domain<float>(
std::move(length), ATTR_DOMAIN_CURVE, ATTR_DOMAIN_POINT);
}
return nullptr;
}
class SplineLengthFieldInput final : public fn::FieldInput {
public:
SplineLengthFieldInput() : fn::FieldInput(CPPType::get<float>(), "Spline Length node")
{
category_ = Category::Generated;
}
GVArray get_varray_for_context(const fn::FieldContext &context,
IndexMask UNUSED(mask),
ResourceScope &scope) const final
{
if (const GeometryComponentFieldContext *geometry_context =
dynamic_cast<const GeometryComponentFieldContext *>(&context)) {
const GeometryComponent &component = geometry_context->geometry_component();
const AttributeDomain domain = geometry_context->domain();
if (component.type() == GEO_COMPONENT_TYPE_CURVE) {
const CurveComponent &curve_component = static_cast<const CurveComponent &>(component);
return construct_spline_length_gvarray(curve_component, domain, scope);
}
}
return {};
}
uint64_t hash() const override
{
/* Some random constant hash. */
return 3549623580;
}
bool is_equal_to(const fn::FieldNode &other) const override
{
return dynamic_cast<const SplineLengthFieldInput *>(&other) != nullptr;
}
};
static void geo_node_input_spline_length_exec(GeoNodeExecParams params)
{
Field<float> length_field{std::make_shared<SplineLengthFieldInput>()};
params.set_output("Length", std::move(length_field));
}
} // namespace blender::nodes
void register_node_type_geo_input_spline_length()
{
static bNodeType ntype;
geo_node_type_base(&ntype, GEO_NODE_INPUT_SPLINE_LENGTH, "Spline Length", NODE_CLASS_INPUT, 0);
ntype.geometry_node_execute = blender::nodes::geo_node_input_spline_length_exec;
ntype.declare = blender::nodes::geo_node_input_spline_length_declare;
nodeRegisterType(&ntype);
}
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