1 files changed, 77 insertions, 0 deletions
diff --git a/source/blender/io/alembic/exporter/abc_writer_abstract.h b/source/blender/io/alembic/exporter/abc_writer_abstract.h
new file mode 100644
index 00000000000..a83373a567a
--- /dev/null
+++ b/source/blender/io/alembic/exporter/abc_writer_abstract.h
@@ -0,0 +1,77 @@
+/*
+ * 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.
+ *
+ * The Original Code is Copyright (C) 2020 Blender Foundation.
+ * All rights reserved.
+ */
+#pragma once
+
+#include "IO_abstract_hierarchy_iterator.h"
+#include "abc_hierarchy_iterator.h"
+
+#include <Alembic/Abc/OObject.h>
+#include <vector>
+
+#include "DEG_depsgraph_query.h"
+#include "DNA_material_types.h"
+
+struct Material;
+struct Object;
+
+namespace blender {
+namespace io {
+namespace alembic {
+
+class ABCAbstractWriter : public AbstractHierarchyWriter {
+ protected:
+  const ABCWriterConstructorArgs args_;
+
+  bool frame_has_been_written_;
+  bool is_animated_;
+  uint32_t timesample_index_;
+  Imath::Box3d bounding_box_;
+
+ public:
+  explicit ABCAbstractWriter(const ABCWriterConstructorArgs &args);
+  virtual ~ABCAbstractWriter();
+
+  virtual void write(HierarchyContext &context) override;
+
+  /* Returns true if the data to be written is actually supported. This would, for example, allow a
+   * hypothetical camera writer accept a perspective camera but reject an orthogonal one.
+   *
+   * Returning false from a transform writer will prevent the object and all its descendants from
+   * being exported. Returning false from a data writer (object data, hair, or particles) will
+   * only prevent that data from being written (and thus cause the object to be exported as an
+   * Empty). */
+  virtual bool is_supported(const HierarchyContext *context) const;
+
+  const Imath::Box3d &bounding_box() const;
+
+  /* Called by AlembicHierarchyCreator after checking that the data is supported via
+   * is_supported(). */
+  virtual void create_alembic_objects(const HierarchyContext *context) = 0;
+
+  virtual const Alembic::Abc::OObject get_alembic_object() const = 0;
+
+ protected:
+  virtual void do_write(HierarchyContext &context) = 0;
+
+  virtual void update_bounding_box(Object *object);
+};
+
+}  // namespace alembic
+}  // namespace io
+}  // namespace blender