Cleanup: Alembic, moved exporter code into separate directory

This moves most of the exporter-related code
from `source/blender/io/alembic/intern`
to   `source/blender/io/alembic/exporter`

This is to prepare the Alembic code for the switchover to using
`blender::io::AbstractHierarchyIterator`. When that happens, a few more
files will be added, and having things in a separate 'exporter'
directory makes things less cluttered.

Note that exporting consists of multiple steps (determine export
hierarchy, create Alembic archive, and then write data into it), which
is why the directory is called "exporter", but many of the files are
called "writer".

No functional changes.

1 files changed, 91 insertions, 0 deletions

diff --git a/source/blender/io/alembic/exporter/abc_writer_mesh.h b/source/blender/io/alembic/exporter/abc_writer_mesh.h
new file mode 100644
index 00000000000..264696333a3
--- /dev/null
+++ b/source/blender/io/alembic/exporter/abc_writer_mesh.h
@@ -0,0 +1,91 @@
+/*
+ * 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.
+ */
+
+/** \file
+ * \ingroup balembic
+ */
+
+#ifndef __ABC_WRITER_MESH_H__
+#define __ABC_WRITER_MESH_H__
+
+#include "abc_writer_object.h"
+#include "intern/abc_customdata.h"
+
+struct Mesh;
+struct ModifierData;
+
+/* Writer for Alembic meshes. Does not assume the object is a mesh object. */
+class AbcGenericMeshWriter : public AbcObjectWriter {
+ protected:
+  Alembic::AbcGeom::OPolyMeshSchema m_mesh_schema;
+  Alembic::AbcGeom::OPolyMeshSchema::Sample m_mesh_sample;
+
+  Alembic::AbcGeom::OSubDSchema m_subdiv_schema;
+  Alembic::AbcGeom::OSubDSchema::Sample m_subdiv_sample;
+
+  Alembic::Abc::OArrayProperty m_mat_indices;
+
+  bool m_is_animated;
+  ModifierData *m_subsurf_mod;
+
+  CDStreamConfig m_custom_data_config;
+
+  bool m_is_liquid;
+  bool m_is_subd;
+
+ public:
+  AbcGenericMeshWriter(Object *ob,
+                       AbcTransformWriter *parent,
+                       uint32_t time_sampling,
+                       ExportSettings &settings);
+
+  ~AbcGenericMeshWriter();
+  void setIsAnimated(bool is_animated);
+
+ protected:
+  virtual void do_write();
+  virtual bool isAnimated() const;
+  virtual Mesh *getEvaluatedMesh(Scene *scene_eval, Object *ob_eval, bool &r_needsfree) = 0;
+  virtual void freeEvaluatedMesh(struct Mesh *mesh);
+
+  Mesh *getFinalMesh(bool &r_needsfree);
+
+  void writeMesh(struct Mesh *mesh);
+  void writeSubD(struct Mesh *mesh);
+
+  void writeArbGeoParams(struct Mesh *mesh);
+  void getGeoGroups(struct Mesh *mesh, std::map<std::string, std::vector<int32_t>> &geoGroups);
+
+  /* fluid surfaces support */
+  void getVelocities(struct Mesh *mesh, std::vector<Imath::V3f> &vels);
+
+  template<typename Schema> void writeFaceSets(struct Mesh *mesh, Schema &schema);
+};
+
+class AbcMeshWriter : public AbcGenericMeshWriter {
+ public:
+  AbcMeshWriter(Object *ob,
+                AbcTransformWriter *parent,
+                uint32_t time_sampling,
+                ExportSettings &settings);
+
+  ~AbcMeshWriter();
+
+ protected:
+  virtual Mesh *getEvaluatedMesh(Scene *scene_eval, Object *ob_eval, bool &r_needsfree) override;
+};
+
+#endif /* __ABC_WRITER_MESH_H__ */