Cleanup: move Alembic, AVI, Collada, and USD to `source/blender/io`

This moves the `alembic`, `avi`, `collada`, and `usd` modules into a common
`io` directory.

This also cleans up some `#include "../../{somedir}/{somefile}.h"` by
adding `../../io/{somedir}` to `CMakeLists.txt` and then just using
`#include "{somefile}.h"`.

No functional changes.

1 files changed, 42 insertions, 0 deletions

diff --git a/source/blender/io/usd/intern/usd_writer_metaball.h b/source/blender/io/usd/intern/usd_writer_metaball.h
new file mode 100644
index 00000000000..1a86daae2ae
--- /dev/null
+++ b/source/blender/io/usd/intern/usd_writer_metaball.h
@@ -0,0 +1,42 @@
+/*
+ * 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.
+ */
+#ifndef __USD_WRITER_METABALL_H__
+#define __USD_WRITER_METABALL_H__
+
+#include "usd_writer_mesh.h"
+
+namespace USD {
+
+class USDMetaballWriter : public USDGenericMeshWriter {
+ public:
+  USDMetaballWriter(const USDExporterContext &ctx);
+
+ protected:
+  virtual Mesh *get_export_mesh(Object *object_eval, bool &r_needsfree) override;
+  virtual void free_export_mesh(Mesh *mesh) override;
+  virtual bool is_supported(const HierarchyContext *context) const override;
+  virtual bool check_is_animated(const HierarchyContext &context) const override;
+
+ private:
+  bool is_basis_ball(Scene *scene, Object *ob) const;
+};
+
+}  // namespace USD
+
+#endif /* __USD_WRITER_METABALL_H__ */