node_geo_evaluate_at_index.cc

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/* SPDX-FileCopyrightText: 2023 Blender Authors
 *
 * SPDX-License-Identifier: GPL-2.0-or-later */
 
#include "node_geometry_util.hh"
 
#include "NOD_rna_define.hh"
 
#include "UI_interface_layout.hh"
#include "UI_resources.hh"
 
#include "RNA_enum_types.hh"
 
#include "NOD_socket_search_link.hh"
 
namespace blender::nodes::node_geo_evaluate_at_index_cc {
 
static void node_declare(NodeDeclarationBuilder &b)
{
  b.use_custom_socket_order();
  b.allow_any_socket_order();
  b.add_default_layout();
  const bNode *node = b.node_or_null();
  if (node != nullptr) {
    const eCustomDataType data_type = eCustomDataType(node->custom2);
    b.add_input(data_type, "Value").hide_value().supports_field();
    b.add_output(data_type, "Value").field_source_reference_all().align_with_previous();
  }
  b.add_input<decl::Int>("Index").min(0).supports_field();
}
 
static void node_layout(uiLayout *layout, bContext * /*C*/, PointerRNA *ptr)
{
  layout->prop(ptr, "data_type", UI_ITEM_NONE, "", ICON_NONE);
  layout->prop(ptr, "domain", UI_ITEM_NONE, "", ICON_NONE);
}
 
static void node_init(bNodeTree * /*tree*/, bNode *node)
{
  node->custom1 = int(AttrDomain::Point);
  node->custom2 = CD_PROP_FLOAT;
}
 
static void node_gather_link_searches(GatherLinkSearchOpParams &params)
{
  const blender::bke::bNodeType &node_type = params.node_type();
  const std::optional<eCustomDataType> type = bke::socket_type_to_custom_data_type(
      eNodeSocketDatatype(params.other_socket().type));
  if (type && *type != CD_PROP_STRING) {
    params.add_item(IFACE_("Value"), [node_type, type](LinkSearchOpParams &params) {
      bNode &node = params.add_node(node_type);
      node.custom2 = *type;
      params.update_and_connect_available_socket(node, "Value");
    });
    params.add_item(
        IFACE_("Index"),
        [node_type, type](LinkSearchOpParams &params) {
          bNode &node = params.add_node(node_type);
          node.custom2 = *type;
          params.update_and_connect_available_socket(node, "Index");
        },
        -1);
  }
}
 
static void node_geo_exec(GeoNodeExecParams params)
{
  const bNode &node = params.node();
  const AttrDomain domain = AttrDomain(node.custom1);
 
  GField output_field{std::make_shared<bke::EvaluateAtIndexInput>(
      params.extract_input<Field<int>>("Index"), params.extract_input<GField>("Value"), domain)};
  params.set_output<GField>("Value", std::move(output_field));
}
 
static void node_rna(StructRNA *srna)
{
  RNA_def_node_enum(srna,
                    "domain",
                    "Domain",
                    "Domain the field is evaluated in",
                    rna_enum_attribute_domain_items,
                    NOD_inline_enum_accessors(custom1),
                    int(AttrDomain::Point));
 
  RNA_def_node_enum(srna,
                    "data_type",
                    "Data Type",
                    "",
                    rna_enum_attribute_type_items,
                    NOD_inline_enum_accessors(custom2),
                    CD_PROP_FLOAT,
                    enums::attribute_type_type_with_socket_fn);
}
 
static void node_register()
{
  static blender::bke::bNodeType ntype;
 
  geo_node_type_base(&ntype, "GeometryNodeFieldAtIndex", GEO_NODE_EVALUATE_AT_INDEX);
  ntype.ui_name = "Evaluate at Index";
  ntype.ui_description = "Retrieve data of other elements in the context's geometry";
  ntype.enum_name_legacy = "FIELD_AT_INDEX";
  ntype.nclass = NODE_CLASS_CONVERTER;
  ntype.geometry_node_execute = node_geo_exec;
  ntype.draw_buttons = node_layout;
  ntype.initfunc = node_init;
  ntype.declare = node_declare;
  ntype.gather_link_search_ops = node_gather_link_searches;
  blender::bke::node_register_type(ntype);
 
  node_rna(ntype.rna_ext.srna);
}
NOD_REGISTER_NODE(node_register)
 
}  // namespace blender::nodes::node_geo_evaluate_at_index_cc