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panda/src/egg2pg/eggBinner.cxx

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// Filename: eggBinner.cxx
// Created by:  drose (17Feb00)
//
////////////////////////////////////////////////////////////////////
//
// PANDA 3D SOFTWARE
// Copyright (c) 2001, Disney Enterprises, Inc.  All rights reserved
//
// All use of this software is subject to the terms of the Panda 3d
// Software license.  You should have received a copy of this license
// along with this source code; you will also find a current copy of
// the license at http://www.panda3d.org/license.txt .
//
// To contact the maintainers of this program write to
// panda3d@yahoogroups.com .
//
////////////////////////////////////////////////////////////////////

#include "eggBinner.h"

#include "eggSwitchCondition.h"
#include "eggGroup.h"
#include "dcast.h"

////////////////////////////////////////////////////////////////////
//     Function: EggBinner::get_bin_number
//       Access: Public, Virtual
//  Description:
////////////////////////////////////////////////////////////////////
int EggBinner::
get_bin_number(const EggNode *node) {
  if (node->is_of_type(EggGroup::get_class_type())) {
    const EggGroup *group = DCAST(EggGroup, node);
    if (group->has_lod()) {
      return (int)BN_lod;
    }
  }

  return (int)BN_none;
}


////////////////////////////////////////////////////////////////////
//     Function: EggBinner::sorts_less
//       Access: Public, Virtual
//  Description:
////////////////////////////////////////////////////////////////////
bool EggBinner::
sorts_less(int bin_number, const EggNode *a, const EggNode *b) {
  assert((BinNumber)bin_number == BN_lod);

  const EggGroup *ga = DCAST(EggGroup, a);
  const EggGroup *gb = DCAST(EggGroup, b);

  const EggSwitchCondition &swa = ga->get_lod();
  const EggSwitchCondition &swb = gb->get_lod();

  // For now, this is the only kind of switch condition there is.
  const EggSwitchConditionDistance &swda =
    *DCAST(EggSwitchConditionDistance, &swa);
  const EggSwitchConditionDistance &swdb =
    *DCAST(EggSwitchConditionDistance, &swb);

  // Group LOD nodes in order by switching center.
  return (swda._center.compare_to(swdb._center) < 0);
}

////////////////////////////////////////////////////////////////////
//     Function: EggBinner::collapse_group
//       Access: Public, Virtual
//  Description:
////////////////////////////////////////////////////////////////////
bool EggBinner::
collapse_group(const EggGroup *group, int) {
  if (group->get_dart_type() != EggGroup::DT_none) {
    // A group with the <Dart> flag set means to create a character.
    // We can't turn the top character node into an LOD.
    return false;
  }

  return true;
}

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