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/* SPDX-License-Identifier: GPL-2.0-or-later */
#include "node_geometry_util.hh"
namespace blender::nodes::node_geo_input_curve_handles_cc {
static void node_declare(NodeDeclarationBuilder &b)
{
b.add_input<decl::Bool>(N_("Relative"))
.default_value(false)
.supports_field()
.description(N_("Output the handle positions relative to the corresponding control point "
"instead of in the local space of the geometry"));
b.add_output<decl::Vector>(N_("Left")).field_source();
b.add_output<decl::Vector>(N_("Right")).field_source();
}
class HandlePositionFieldInput final : public GeometryFieldInput {
Field<bool> relative_;
bool left_;
public:
HandlePositionFieldInput(Field<bool> relative, bool left)
: GeometryFieldInput(CPPType::get<float3>(), "Handle"), relative_(relative), left_(left)
{
}
GVArray get_varray_for_context(const GeometryComponent &component,
const eAttrDomain domain,
IndexMask mask) const final
{
if (component.type() != GEO_COMPONENT_TYPE_CURVE) {
return {};
}
GeometryComponentFieldContext field_context{component, ATTR_DOMAIN_POINT};
fn::FieldEvaluator evaluator(field_context, &mask);
evaluator.add(relative_);
evaluator.evaluate();
const VArray<bool> relative = evaluator.get_evaluated<bool>(0);
const AttributeAccessor attributes = *component.attributes();
VArray<float3> positions = attributes.lookup_or_default<float3>(
"position", ATTR_DOMAIN_POINT, {0, 0, 0});
StringRef side = left_ ? "handle_left" : "handle_right";
VArray<float3> handles = attributes.lookup_or_default<float3>(
side, ATTR_DOMAIN_POINT, {0, 0, 0});
if (relative.is_single()) {
if (relative.get_internal_single()) {
Array<float3> output(positions.size());
for (const int i : positions.index_range()) {
output[i] = handles[i] - positions[i];
}
return attributes.adapt_domain<float3>(
VArray<float3>::ForContainer(std::move(output)), ATTR_DOMAIN_POINT, domain);
}
return attributes.adapt_domain<float3>(handles, ATTR_DOMAIN_POINT, domain);
}
Array<float3> output(positions.size());
for (const int i : positions.index_range()) {
if (relative[i]) {
output[i] = handles[i] - positions[i];
}
else {
output[i] = handles[i];
}
}
return component.attributes()->adapt_domain<float3>(
VArray<float3>::ForContainer(std::move(output)), ATTR_DOMAIN_POINT, domain);
}
uint64_t hash() const override
{
return get_default_hash_2(relative_, left_);
}
bool is_equal_to(const fn::FieldNode &other) const override
{
if (const HandlePositionFieldInput *other_handle =
dynamic_cast<const HandlePositionFieldInput *>(&other)) {
return relative_ == other_handle->relative_ && left_ == other_handle->left_;
}
return false;
}
};
static void node_geo_exec(GeoNodeExecParams params)
{
Field<bool> relative = params.extract_input<Field<bool>>("Relative");
Field<float3> left_field{std::make_shared<HandlePositionFieldInput>(relative, true)};
Field<float3> right_field{std::make_shared<HandlePositionFieldInput>(relative, false)};
params.set_output("Left", std::move(left_field));
params.set_output("Right", std::move(right_field));
}
} // namespace blender::nodes::node_geo_input_curve_handles_cc
void register_node_type_geo_input_curve_handles()
{
namespace file_ns = blender::nodes::node_geo_input_curve_handles_cc;
static bNodeType ntype;
geo_node_type_base(
&ntype, GEO_NODE_INPUT_CURVE_HANDLES, "Curve Handle Positions", NODE_CLASS_INPUT);
node_type_size_preset(&ntype, NODE_SIZE_MIDDLE);
ntype.geometry_node_execute = file_ns::node_geo_exec;
ntype.declare = file_ns::node_declare;
nodeRegisterType(&ntype);
}
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