node_geo_input_instance_scale.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_instances.hh"
 
namespace blender::nodes::node_geo_input_instance_scale_cc {
 
static void node_declare(NodeDeclarationBuilder &b)
{
  b.add_output<decl::Vector>("Scale").field_source();
}
 
class InstanceScaleFieldInput final : public bke::InstancesFieldInput {
 public:
  InstanceScaleFieldInput() : bke::InstancesFieldInput(CPPType::get<float3>(), "Scale") {}
 
  GVArray get_varray_for_context(const bke::Instances &instances,
                                 const IndexMask & /*mask*/) const final
  {
    const Span<float4x4> transforms = instances.transforms();
    return VArray<float3>::ForFunc(instances.instances_num(), [transforms](const int i) {
      return math::to_scale<true>(transforms[i]);
    });
  }
 
  uint64_t hash() const override
  {
    return 8346343;
  }
 
  bool is_equal_to(const fn::FieldNode &other) const override
  {
    return dynamic_cast<const InstanceScaleFieldInput *>(&other) != nullptr;
  }
};
 
static void node_geo_exec(GeoNodeExecParams params)
{
  Field<float3> scale{std::make_shared<InstanceScaleFieldInput>()};
  params.set_output("Scale", std::move(scale));
}
 
static void node_register()
{
  static blender::bke::bNodeType ntype;
  geo_node_type_base(&ntype, GEO_NODE_INPUT_INSTANCE_SCALE, "Instance Scale", NODE_CLASS_INPUT);
  ntype.geometry_node_execute = node_geo_exec;
  ntype.declare = node_declare;
  blender::bke::node_register_type(&ntype);
}
NOD_REGISTER_NODE(node_register)
 
}  // namespace blender::nodes::node_geo_input_instance_scale_cc