node_geo_grid_info.cc

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/* SPDX-FileCopyrightText: 2023 Blender Authors
 *
 * SPDX-License-Identifier: GPL-2.0-or-later */
 
#include "node_geometry_util.hh"
 
#include "BLI_math_matrix.hh"
 
#include "BKE_attribute_math.hh"
#include "BKE_volume_grid.hh"
#include "BKE_volume_openvdb.hh"
 
#include "NOD_rna_define.hh"
#include "NOD_socket.hh"
 
#include "UI_interface.hh"
#include "UI_resources.hh"
 
#include "RNA_enum_types.hh"
 
namespace blender::nodes::node_geo_grid_info_cc {
 
static void node_declare(NodeDeclarationBuilder &b)
{
  const bNode *node = b.node_or_null();
  if (!node) {
    return;
  }
 
  const eNodeSocketDatatype data_type = eNodeSocketDatatype(node->custom1);
 
  b.add_input(data_type, "Grid").hide_value();
 
  b.add_output<decl::Matrix>("Transform")
      .description("Transform from grid index space to object space");
  b.add_output(data_type, "Background Value").description("Default value outside of grid voxels");
}
 
static void node_layout(uiLayout *layout, bContext * /*C*/, PointerRNA *ptr)
{
  uiLayoutSetPropSep(layout, true);
  uiLayoutSetPropDecorate(layout, false);
  layout->prop(ptr, "data_type", UI_ITEM_NONE, "", ICON_NONE);
}
 
static void node_geo_exec(GeoNodeExecParams params)
{
#ifdef WITH_OPENVDB
  const eNodeSocketDatatype data_type = eNodeSocketDatatype(params.node().custom1);
 
  const auto grid = params.extract_input<bke::GVolumeGrid>("Grid");
  if (!grid) {
    params.set_default_remaining_outputs();
    return;
  }
 
  bke::VolumeTreeAccessToken tree_token;
  const std::shared_ptr<const openvdb::GridBase> vdb_grid = grid->grid_ptr(tree_token);
  params.set_output("Transform", BKE_volume_transform_to_blender(vdb_grid->transform()));
 
  bke::attribute_math::convert_to_static_type(
      *bke::socket_type_to_geo_nodes_base_cpp_type(data_type), [&](auto type_tag) {
        using ValueT = decltype(type_tag);
        using type_traits = typename bke::VolumeGridTraits<ValueT>;
        using TreeType = typename type_traits::TreeType;
        using GridType = openvdb::Grid<TreeType>;
 
        if constexpr (!std::is_same_v<typename type_traits::BlenderType, void>) {
          const std::shared_ptr<const GridType> vdb_typed_grid = openvdb::GridBase::grid<GridType>(
              vdb_grid);
          params.set_output("Background Value",
                            type_traits::to_blender(vdb_typed_grid->background()));
        }
      });
#else
  params.set_default_remaining_outputs();
  params.error_message_add(NodeWarningType::Error,
                           TIP_("Disabled, Blender was compiled without OpenVDB"));
#endif
}
 
static void node_init(bNodeTree * /*tree*/, bNode *node)
{
  node->custom1 = SOCK_FLOAT;
}
 
static void node_rna(StructRNA *srna)
{
  RNA_def_node_enum(srna,
                    "data_type",
                    "Data Type",
                    "Type of grid data",
                    rna_enum_node_socket_data_type_items,
                    NOD_inline_enum_accessors(custom1),
                    SOCK_FLOAT,
                    grid_socket_type_items_filter_fn);
}
 
static void node_register()
{
  static blender::bke::bNodeType ntype;
 
  geo_node_type_base(&ntype, "GeometryNodeGridInfo");
  ntype.ui_name = "Grid Info";
  ntype.ui_description = "Retrieve information about a volume grid";
  ntype.nclass = NODE_CLASS_INPUT;
  ntype.initfunc = node_init;
  ntype.geometry_node_execute = node_geo_exec;
  ntype.draw_buttons = node_layout;
  ntype.declare = node_declare;
  blender::bke::node_register_type(ntype);
 
  node_rna(ntype.rna_ext.srna);
}
NOD_REGISTER_NODE(node_register)
 
}  // namespace blender::nodes::node_geo_grid_info_cc