animBundleNode.cxx

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/**
 * PANDA 3D SOFTWARE
 * Copyright (c) Carnegie Mellon University.  All rights reserved.
 *
 * All use of this software is subject to the terms of the revised BSD
 * license.  You should have received a copy of this license along
 * with this source code in a file named "LICENSE."
 *
 * @file animBundleNode.cxx
 * @author drose
 * @date 2002-03-06
 */

#include "animBundleNode.h"
#include "datagram.h"
#include "datagramIterator.h"
#include "bamReader.h"
#include "bamWriter.h"

TypeHandle AnimBundleNode::_type_handle;


/**
 *
 */
PandaNode *AnimBundleNode::
make_copy() const {
  return new AnimBundleNode(*this);
}

/**
 * Returns true if it is generally safe to flatten out this particular kind of
 * Node by duplicating instances, false otherwise (for instance, a Camera
 * cannot be safely flattened, because the Camera pointer itself is
 * meaningful).
 */
bool AnimBundleNode::
safe_to_flatten() const {
  return false;
}

/**
 * Recursively walks the scene graph beginning at the indicated node (which
 * need not be an AnimBundleNode), and returns the first AnimBundle found.
 * Returns NULL if no AnimBundle can be found.
 */
AnimBundle *AnimBundleNode::
find_anim_bundle(PandaNode *root) {
  nassertr(root != nullptr, nullptr);

  if (root->is_of_type(AnimBundleNode::get_class_type())) {
    AnimBundleNode *anode = DCAST(AnimBundleNode, root);
    AnimBundle *anim = anode->get_bundle();
    if (anim != nullptr) {
      return anim;
    }
  }

  Children cr = root->get_children();
  int num_children = cr.get_num_children();
  for (int i = 0; i < num_children; i++) {
    AnimBundle *anim = find_anim_bundle(cr.get_child(i));
    if (anim != nullptr) {
      return anim;
    }
  }

  return nullptr;
}

/**
 * Tells the BamReader how to create objects of type AnimBundleNode.
 */
void AnimBundleNode::
register_with_read_factory() {
  BamReader::get_factory()->register_factory(get_class_type(), make_from_bam);
}

/**
 * Writes the contents of this object to the datagram for shipping out to a
 * Bam file.
 */
void AnimBundleNode::
write_datagram(BamWriter *manager, Datagram &dg) {
  PandaNode::write_datagram(manager, dg);
  manager->write_pointer(dg, _bundle);
}

/**
 * Receives an array of pointers, one for each time manager->read_pointer()
 * was called in fillin(). Returns the number of pointers processed.
 */
int AnimBundleNode::
complete_pointers(TypedWritable **p_list, BamReader* manager) {
  int pi = PandaNode::complete_pointers(p_list, manager);
  _bundle = DCAST(AnimBundle, p_list[pi++]);
  return pi;
}

/**
 * This function is called by the BamReader's factory when a new object of
 * this type is encountered in the Bam file.  It should create the object and
 * extract its information from the file.
 */
TypedWritable *AnimBundleNode::
make_from_bam(const FactoryParams &params) {
  AnimBundleNode *node = new AnimBundleNode;
  DatagramIterator scan;
  BamReader *manager;

  parse_params(params, scan, manager);
  node->fillin(scan, manager);

  return node;
}

/**
 * This internal function is called by make_from_bam to read in all of the
 * relevant data from the BamFile for the new PandaNode.
 */
void AnimBundleNode::
fillin(DatagramIterator &scan, BamReader* manager) {
  PandaNode::fillin(scan, manager);
  manager->read_pointer(scan);
}