/*
 * 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>

#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