usd_hierarchy_iterator.hh

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/* SPDX-FileCopyrightText: 2019 Blender Authors
 *
 * SPDX-License-Identifier: GPL-2.0-or-later */
#pragma once
 
#include "IO_abstract_hierarchy_iterator.h"
#include "usd.hh"
#include "usd_exporter_context.hh"
#include "usd_skel_convert.hh"
 
#include <string>
 
#include <pxr/usd/usd/common.h>
#include <pxr/usd/usd/timeCode.h>
 
struct Depsgraph;
struct Main;
struct Object;
 
namespace blender::io::usd {
 
using blender::io::AbstractHierarchyIterator;
using blender::io::AbstractHierarchyWriter;
using blender::io::HierarchyContext;
 
class USDHierarchyIterator : public AbstractHierarchyIterator {
 private:
  const pxr::UsdStageRefPtr stage_;
  pxr::UsdTimeCode export_time_;
  const USDExportParams &params_;
 
  ObjExportMap armature_export_map_;
  ObjExportMap skinned_mesh_export_map_;
  ObjExportMap shape_key_mesh_export_map_;
 
  /* Map prototype_paths[instancer path] = [
   *   (proto_path_1, proto_object_1), (proto_path_2, proto_object_2), ... ] */
  Map<pxr::SdfPath, Set<std::pair<pxr::SdfPath, Object *>>> prototype_paths_;
 
 public:
  USDHierarchyIterator(Main *bmain,
                       Depsgraph *depsgraph,
                       pxr::UsdStageRefPtr stage,
                       const USDExportParams &params);
 
  void set_export_frame(float frame_nr);
 
  std::string make_valid_name(const std::string &name) const override;
 
  void process_usd_skel() const;
 
 protected:
  bool mark_as_weak_export(const Object *object) const override;
  bool determine_point_instancers(const HierarchyContext *context);
 
  AbstractHierarchyWriter *create_transform_writer(const HierarchyContext *context) override;
  AbstractHierarchyWriter *create_data_writer(const HierarchyContext *context) override;
  AbstractHierarchyWriter *create_hair_writer(const HierarchyContext *context) override;
  AbstractHierarchyWriter *create_particle_writer(const HierarchyContext *context) override;
 
  void release_writer(AbstractHierarchyWriter *writer) override;
 
  bool include_data_writers(const HierarchyContext *context) const override;
  bool include_child_writers(const HierarchyContext *context) const override;
 
 private:
  USDExporterContext create_usd_export_context(const HierarchyContext *context);
  USDExporterContext create_point_instancer_context(
      const HierarchyContext *context, const USDExporterContext &usd_export_context) const;
 
  void add_usd_skel_export_mapping(const Object *obj, const pxr::SdfPath &usd_path);
};
 
}  // namespace blender::io::usd