fltVertexList.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 fltVertexList.cxx
 * @author drose
 * @date 2000-08-25
 */

#include "fltVertexList.h"
#include "fltRecordReader.h"
#include "fltRecordWriter.h"
#include "fltHeader.h"

TypeHandle FltVertexList::_type_handle;

/**
 *
 */
FltVertexList::
FltVertexList(FltHeader *header) : FltRecord(header) {
}

/**
 * Returns the number of vertices in this vertex list.
 */
int FltVertexList::
get_num_vertices() const {
  return _vertices.size();
}

/**
 * Returns the nth vertex of this vertex list.
 */
FltVertex *FltVertexList::
get_vertex(int n) const {
  nassertr(n >= 0 && n < (int)_vertices.size(), nullptr);
  return _vertices[n];
}

/**
 * Removes all vertices from this vertex list.
 */
void FltVertexList::
clear_vertices() {
  _vertices.clear();
}

/**
 * Adds a new vertex to the end of the vertex list.
 */
void FltVertexList::
add_vertex(FltVertex *vertex) {
  _header->add_vertex(vertex);
  _vertices.push_back(vertex);
}

/**
 * Writes a quick one-line description of the record, but not its children.
 * This is a human-readable description, primarily for debugging; to write a
 * flt file, use FltHeader::write_flt().
 */
void FltVertexList::
output(std::ostream &out) const {
  out << _vertices.size() << " vertices";
}

/**
 * Fills in the information in this bead based on the information given in the
 * indicated datagram, whose opcode has already been read.  Returns true on
 * success, false if the datagram is invalid.
 */
bool FltVertexList::
extract_record(FltRecordReader &reader) {
  if (!FltRecord::extract_record(reader)) {
    return false;
  }

  nassertr(reader.get_opcode() == FO_vertex_list, false);
  DatagramIterator &iterator = reader.get_iterator();

  _vertices.clear();
  while (iterator.get_remaining_size() >= 4) {
    int vertex_offset = iterator.get_be_int32();
    _vertices.push_back(_header->get_vertex_by_offset(vertex_offset));
  }

  check_remaining_size(iterator);
  return true;
}

/**
 * Fills up the current record on the FltRecordWriter with data for this
 * record, but does not advance the writer.  Returns true on success, false if
 * there is some error.
 */
bool FltVertexList::
build_record(FltRecordWriter &writer) const {
  if (!FltRecord::build_record(writer)) {
    return false;
  }

  writer.set_opcode(FO_vertex_list);
  Datagram &datagram = writer.update_datagram();

  Vertices::const_iterator vi;
  for (vi = _vertices.begin(); vi != _vertices.end(); ++vi) {
    datagram.add_be_uint32(_header->get_offset_by_vertex(*vi));
  }

  return true;
}