abc_reader_object.h

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/*
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
 */
#pragma once
 
#include <Alembic/Abc/All.h>
#include <Alembic/AbcGeom/All.h>
 
#include "DNA_ID.h"
 
struct CacheFile;
struct Main;
struct Mesh;
struct Object;
 
using Alembic::AbcCoreAbstract::chrono_t;
 
namespace blender::io::alembic {
 
struct ImportSettings {
  bool do_convert_mat;
  float conversion_mat[4][4];
 
  int from_up;
  int from_forward;
  float scale;
  bool is_sequence;
  bool set_frame_range;
 
  /* Length and frame offset of file sequences. */
  int sequence_len;
  int sequence_offset;
 
  /* From MeshSeqCacheModifierData.read_flag */
  int read_flag;
 
  bool validate_meshes;
 
  CacheFile *cache_file;
 
  ImportSettings()
      : do_convert_mat(false),
        from_up(0),
        from_forward(0),
        scale(1.0f),
        is_sequence(false),
        set_frame_range(false),
        sequence_len(1),
        sequence_offset(0),
        read_flag(0),
        validate_meshes(false),
        cache_file(NULL)
  {
  }
};
 
template<typename Schema> static bool has_animations(Schema &schema, ImportSettings *settings)
{
  return settings->is_sequence || !schema.isConstant();
}
 
class AbcObjectReader {
 protected:
  std::string m_name;
  std::string m_object_name;
  std::string m_data_name;
  Object *m_object;
  Alembic::Abc::IObject m_iobject;
 
  ImportSettings *m_settings;
 
  chrono_t m_min_time;
  chrono_t m_max_time;
 
  /* Use reference counting since the same reader may be used by multiple
   * modifiers and/or constraints. */
  int m_refcount;
 
  bool m_inherits_xform;
 
 public:
  AbcObjectReader *parent_reader;
 
 public:
  explicit AbcObjectReader(const Alembic::Abc::IObject &object, ImportSettings &settings);
 
  virtual ~AbcObjectReader() = default;
 
  const Alembic::Abc::IObject &iobject() const;
 
  typedef std::vector<AbcObjectReader *> ptr_vector;
 
  virtual Alembic::AbcGeom::IXform xform();
 
  Object *object() const;
  void object(Object *ob);
 
  const std::string &name() const
  {
    return m_name;
  }
  const std::string &object_name() const
  {
    return m_object_name;
  }
  const std::string &data_name() const
  {
    return m_data_name;
  }
  bool inherits_xform() const
  {
    return m_inherits_xform;
  }
 
  virtual bool valid() const = 0;
  virtual bool accepts_object_type(const Alembic::AbcCoreAbstract::ObjectHeader &alembic_header,
                                   const Object *const ob,
                                   const char **err_str) const = 0;
 
  virtual void readObjectData(Main *bmain, const Alembic::Abc::ISampleSelector &sample_sel) = 0;
 
  virtual struct Mesh *read_mesh(struct Mesh *mesh,
                                 const Alembic::Abc::ISampleSelector &sample_sel,
                                 int read_flag,
                                 const char **err_str);
  virtual bool topology_changed(Mesh *existing_mesh,
                                const Alembic::Abc::ISampleSelector &sample_sel);
 
  void setupObjectTransform(const float time);
 
  void addCacheModifier();
 
  chrono_t minTime() const;
  chrono_t maxTime() const;
 
  int refcount() const;
  void incref();
  void decref();
 
  void read_matrix(float r_mat[4][4], const float time, const float scale, bool &is_constant);
 
 protected:
  void determine_inherits_xform();
};
 
Imath::M44d get_matrix(const Alembic::AbcGeom::IXformSchema &schema, const float time);
 
}  // namespace blender::io::alembic