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, 64 insertions, 0 deletions

diff --git a/source/blender/io/usd/intern/usd_writer_transform.cc b/source/blender/io/usd/intern/usd_writer_transform.cc
new file mode 100644
index 00000000000..321b516221a
--- /dev/null
+++ b/source/blender/io/usd/intern/usd_writer_transform.cc
@@ -0,0 +1,64 @@
+/*
+ * 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) 2019 Blender Foundation.
+ * All rights reserved.
+ */
+#include "usd_writer_transform.h"
+#include "usd_hierarchy_iterator.h"
+
+#include <pxr/base/gf/matrix4f.h>
+#include <pxr/usd/usdGeom/xform.h>
+
+extern "C" {
+#include "BKE_object.h"
+
+#include "BLI_math_matrix.h"
+
+#include "DNA_layer_types.h"
+}
+
+namespace USD {
+
+USDTransformWriter::USDTransformWriter(const USDExporterContext &ctx) : USDAbstractWriter(ctx)
+{
+}
+
+void USDTransformWriter::do_write(HierarchyContext &context)
+{
+  float parent_relative_matrix[4][4];  // The object matrix relative to the parent.
+  mul_m4_m4m4(parent_relative_matrix, context.parent_matrix_inv_world, context.matrix_world);
+
+  // Write the transform relative to the parent.
+  pxr::UsdGeomXform xform = pxr::UsdGeomXform::Define(usd_export_context_.stage,
+                                                      usd_export_context_.usd_path);
+  if (!xformOp_) {
+    xformOp_ = xform.AddTransformOp();
+  }
+  xformOp_.Set(pxr::GfMatrix4d(parent_relative_matrix), get_export_time_code());
+}
+
+bool USDTransformWriter::check_is_animated(const HierarchyContext &context) const
+{
+  if (context.duplicator != NULL) {
+    /* This object is being duplicated, so could be emitted by a particle system and thus
+     * influenced by forces. TODO(Sybren): Make this more strict. Probably better to get from the
+     * depsgraph whether this object instance has a time source. */
+    return true;
+  }
+  return BKE_object_moves_in_time(context.object, context.animation_check_include_parent);
+}
+
+}  // namespace USD