/*
 * Software License Agreement (BSD License)
 *
 *  Copyright (c) 2011-2014, Willow Garage, Inc.
 *  Copyright (c) 2014-2016, Open Source Robotics Foundation
 *  Copyright (c) 2016, Toyota Research Institute
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 *
 *   * Redistributions of source code must retain the above copyright
 *     notice, this list of conditions and the following disclaimer.
 *   * Redistributions in binary form must reproduce the above
 *     copyright notice, this list of conditions and the following
 *     disclaimer in the documentation and/or other materials provided
 *     with the distribution.
 *   * Neither the name of Open Source Robotics Foundation nor the names of its
 *     contributors may be used to endorse or promote products derived
 *     from this software without specific prior written permission.
 *
 *  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 *  "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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 *  FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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 */

/** @author Jia Pan */

#include "coal/broadphase/detail/morton-inl.h"

namespace coal {

/// @cond IGNORE
namespace detail {

//==============================================================================
uint32_t morton_code(uint32_t x, uint32_t y, uint32_t z) {
  x = (x | (x << 16)) & 0x030000FF;
  x = (x | (x << 8)) & 0x0300F00F;
  x = (x | (x << 4)) & 0x030C30C3;
  x = (x | (x << 2)) & 0x09249249;

  y = (y | (y << 16)) & 0x030000FF;
  y = (y | (y << 8)) & 0x0300F00F;
  y = (y | (y << 4)) & 0x030C30C3;
  y = (y | (y << 2)) & 0x09249249;

  z = (z | (z << 16)) & 0x030000FF;
  z = (z | (z << 8)) & 0x0300F00F;
  z = (z | (z << 4)) & 0x030C30C3;
  z = (z | (z << 2)) & 0x09249249;

  return x | (y << 1) | (z << 2);
}

//==============================================================================
uint64_t morton_code60(uint32_t x, uint32_t y, uint32_t z) {
  uint32_t lo_x = x & 1023u;
  uint32_t lo_y = y & 1023u;
  uint32_t lo_z = z & 1023u;
  uint32_t hi_x = x >> 10u;
  uint32_t hi_y = y >> 10u;
  uint32_t hi_z = z >> 10u;

  return (uint64_t(morton_code(hi_x, hi_y, hi_z)) << 30) |
         uint64_t(morton_code(lo_x, lo_y, lo_z));
}

}  // namespace detail
/// @endcond
}  // namespace coal
