1 files changed, 99 insertions, 0 deletions
diff --git a/source/blender/io/alembic/intern/abc_axis_conversion.h b/source/blender/io/alembic/intern/abc_axis_conversion.h
new file mode 100644
index 00000000000..7fde0e92ea4
--- /dev/null
+++ b/source/blender/io/alembic/intern/abc_axis_conversion.h
@@ -0,0 +1,99 @@
+/*
+ * 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 Kévin Dietrich & Blender Foundation.
+ * All rights reserved.
+ */
+#pragma once
+
+/** \file
+ * \ingroup Alembic
+ */
+
+struct Object;
+
+#ifdef _MSC_VER
+#  define ABC_INLINE static __forceinline
+#else
+#  define ABC_INLINE static inline
+#endif
+
+/* TODO(kevin): for now keeping these transformations hardcoded to make sure
+ * everything works properly, and also because Alembic is almost exclusively
+ * used in Y-up software, but eventually they'll be set by the user in the UI
+ * like other importers/exporters do, to support other axis. */
+
+/* Copy from Y-up to Z-up. */
+
+ABC_INLINE void copy_zup_from_yup(float zup[3], const float yup[3])
+{
+  const float old_yup1 = yup[1]; /* in case zup == yup */
+  zup[0] = yup[0];
+  zup[1] = -yup[2];
+  zup[2] = old_yup1;
+}
+
+ABC_INLINE void copy_zup_from_yup(short zup[3], const short yup[3])
+{
+  const short old_yup1 = yup[1]; /* in case zup == yup */
+  zup[0] = yup[0];
+  zup[1] = -yup[2];
+  zup[2] = old_yup1;
+}
+
+/* Copy from Z-up to Y-up. */
+
+ABC_INLINE void copy_yup_from_zup(float yup[3], const float zup[3])
+{
+  const float old_zup1 = zup[1]; /* in case yup == zup */
+  yup[0] = zup[0];
+  yup[1] = zup[2];
+  yup[2] = -old_zup1;
+}
+
+ABC_INLINE void copy_yup_from_zup(short yup[3], const short zup[3])
+{
+  const short old_zup1 = zup[1]; /* in case yup == zup */
+  yup[0] = zup[0];
+  yup[1] = zup[2];
+  yup[2] = -old_zup1;
+}
+
+/* Names are given in (dst, src) order, just like
+ * the parameters of copy_m44_axis_swap() */
+typedef enum {
+  ABC_ZUP_FROM_YUP = 1,
+  ABC_YUP_FROM_ZUP = 2,
+} AbcAxisSwapMode;
+
+/* Create a rotation matrix for each axis from euler angles.
+ * Euler angles are swapped to change coordinate system. */
+void create_swapped_rotation_matrix(float rot_x_mat[3][3],
+                                    float rot_y_mat[3][3],
+                                    float rot_z_mat[3][3],
+                                    const float euler[3],
+                                    AbcAxisSwapMode mode);
+
+void copy_m44_axis_swap(float dst_mat[4][4], float src_mat[4][4], AbcAxisSwapMode mode);
+
+typedef enum {
+  ABC_MATRIX_WORLD = 1,
+  ABC_MATRIX_LOCAL = 2,
+} AbcMatrixMode;
+
+void create_transform_matrix(Object *obj,
+                             float r_transform_mat[4][4],
+                             AbcMatrixMode mode,
+                             Object *proxy_from);