Basic Alembic support

All in all, this patch adds an Alembic importer, an Alembic exporter,
and a new CacheFile data block which, for now, wraps around an Alembic
archive. This data block is made available through a new modifier ("Mesh
Sequence Cache") as well as a new constraint ("Transform Cache") to
somewhat properly support respectively geometric and transformation data
streaming from alembic caches.

A more in-depth documentation is to be found on the wiki, as well as a
 guide to compile alembic: https://wiki.blender.org/index.php/
User:Kevindietrich/AlembicBasicIo.

Many thanks to everyone involved in this little project, and huge shout
out to "cgstrive" for the thorough testings with Maya, 3ds Max, Houdini
and Realflow as well as @fjuhec, @jensverwiebe and @jasperge for the
custom builds and compile fixes.

Reviewers: sergey, campbellbarton, mont29

Reviewed By: sergey, campbellbarton, mont29

Differential Revision: https://developer.blender.org/D2060

1 files changed, 84 insertions, 0 deletions

diff --git a/source/blender/makesdna/DNA_cachefile_types.h b/source/blender/makesdna/DNA_cachefile_types.h
new file mode 100644
index 00000000000..1cda0233aa8
--- /dev/null
+++ b/source/blender/makesdna/DNA_cachefile_types.h
@@ -0,0 +1,84 @@
+/*
+ * ***** BEGIN GPL LICENSE BLOCK *****
+ *
+ * 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) 2016 Blender Foundation.
+ * All rights reserved.
+ *
+ * Contributor(s): Kevin Dietrich.
+ *
+ * ***** END GPL LICENSE BLOCK *****
+ */
+
+/** \file DNA_cachefile_types.h
+ *  \ingroup DNA
+ */
+
+#ifndef __DNA_CACHEFILE_TYPES_H__
+#define __DNA_CACHEFILE_TYPES_H__
+
+#include "DNA_ID.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+
+/* CacheFile::flag */
+enum {
+	CACHEFILE_DS_EXPAND = (1 << 0),
+};
+
+/* CacheFile::draw_flag */
+enum {
+	CACHEFILE_KEYFRAME_DRAWN = (1 << 0),
+};
+
+typedef struct AlembicObjectPath {
+	struct AlembicObjectPath *next, *prev;
+
+	char path[1024];  /* 1024 = FILE_MAX, might use PATH_MAX in the future. */
+} AlembicObjectPath;
+
+typedef struct CacheFile {
+	ID id;
+	struct AnimData *adt;
+
+	struct AbcArchiveHandle *handle;
+
+	/* Paths of the objects inside of the Alembic archive referenced by this
+	 * CacheFile. */
+	ListBase object_paths;
+
+	char filepath[1024];  /* 1024 = FILE_MAX */
+
+	char is_sequence;
+	char forward_axis;
+	char up_axis;
+	char override_frame;
+
+	float scale;
+	float frame;  /* The frame/time to lookup in the cache file. */
+
+	short flag;  /* Animation flag. */
+	short draw_flag;
+} CacheFile;
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif  /* __DNA_CACHEFILE_TYPES_H__ */