/**
 * 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 nodeCullCallbackData.cxx
 * @author drose
 * @date 2009-03-13
 */

#include "nodeCullCallbackData.h"
#include "callbackNode.h"
#include "cullTraverser.h"
#include "cullTraverserData.h"
#include "cullableObject.h"
#include "cullHandler.h"

TypeHandle NodeCullCallbackData::_type_handle;

/**
 *
 */
void NodeCullCallbackData::
output(std::ostream &out) const {
  out << get_type() << "(" << (void *)_trav << ", " << (void *)&_data << ")";
}

/**
 * You should make this call during the callback if you want to continue the
 * normal rendering function that would have been done in the absence of a
 * callback.
 *
 * Specifically, this method will add this node to the draw queue, and
 * continue the cull traversal for all the nodes below.  If you omit this
 * call, this node and its children will be pruned from the render result.
 */
void NodeCullCallbackData::
upcall() {
  PandaNode *node = _data.node();
  if (node->is_of_type(CallbackNode::get_class_type())) {
    CallbackNode *cbnode = (CallbackNode *)node;

    // OK, render this node.  Rendering a CallbackNode means creating a
    // CullableObject for the draw_callback, if any.  We don't need to pass
    // any Geoms, however.
    CallbackObject *cbobj = cbnode->get_draw_callback();
    if (cbobj != nullptr) {
      CullableObject *object =
        new CullableObject(nullptr, _data._state,
                           _data.get_internal_transform(_trav));
      object->set_draw_callback(cbobj);
      _trav->get_cull_handler()->record_object(object, _trav);
    }
  }

  // Now visit all the node's children.
  PandaNodePipelineReader *node_reader = _data.node_reader();
  PandaNode::Children children = node_reader->get_children();
  node_reader->release();
  int num_children = children.get_num_children();
  for (int i = 0; i < num_children; ++i) {
    CullTraverserData next_data(_data, children.get_child(i));
    _trav->traverse(next_data);
  }
}