lwoInputFile.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 lwoInputFile.cxx
 * @author drose
 * @date 2001-04-24
 */

#include "lwoInputFile.h"
#include "lwoBoundingBox.h"
#include "lwoClip.h"
#include "lwoDiscontinuousVertexMap.h"
#include "lwoHeader.h"
#include "lwoLayer.h"
#include "lwoPoints.h"
#include "lwoPolygons.h"
#include "lwoPolygonTags.h"
#include "lwoTags.h"
#include "lwoSurface.h"
#include "lwoVertexMap.h"

using std::string;

TypeHandle LwoInputFile::_type_handle;

/**
 *
 */
LwoInputFile::
LwoInputFile() {
}

/**
 *
 */
LwoInputFile::
~LwoInputFile() {
}

/**
 * Reads a Lightwave variable-length index.  This is either a 2-byte or 4-byte
 * integer.
 */
int LwoInputFile::
get_vx() {
  uint16_t top = get_be_uint16();
  if ((top & 0xff00) == 0xff00) {
    // The first byte is 0xff, which indicates we have a 4-byte integer.
    uint16_t bottom = get_be_uint16();
    return ((int)(top & 0xff) << 16) | bottom;
  }

  // The first byte is not 0xff, which indicates we have a 2-byte integer.
  return top;
}

/**
 * Reads a three-component vector of floats.
 */
LVecBase3 LwoInputFile::
get_vec3() {
  LVecBase3 result;
  result[0] = get_be_float32();
  result[1] = get_be_float32();
  result[2] = get_be_float32();
  return result;
}

/**
 * Reads a Lightwave platform-neutral filename and converts it to a Panda
 * platform-neutral filename.
 */
Filename LwoInputFile::
get_filename() {
  string name = get_string();
  size_t colon = name.find(':');
  if (colon == string::npos) {
    // No colon; it's just a relative path.
    return Filename(name);
  }

  // The colon separates the device and the path.
  string device = name.substr(0, colon);
  string path = name.substr(colon + 1);

  nout << "Ignoring filename device " << device << "\n";
  return Filename("/", path);
}

/**
 * Allocates and returns a new chunk of the appropriate type based on the
 * given ID.
 */
IffChunk *LwoInputFile::
make_new_chunk(IffId id) {
  if (id == IffId("FORM")) {
    return new LwoHeader;

  } else if (id == IffId("LAYR")) {
    return new LwoLayer;

  } else if (id == IffId("PNTS")) {
    return new LwoPoints;

  } else if (id == IffId("VMAP")) {
    return new LwoVertexMap;

  } else if (id == IffId("VMAD")) {
    return new LwoDiscontinuousVertexMap;

  } else if (id == IffId("POLS")) {
    return new LwoPolygons;

  } else if (id == IffId("TAGS") ||
             id == IffId("SRFS")) {
    return new LwoTags;

  } else if (id == IffId("PTAG")) {
    return new LwoPolygonTags;

  } else if (id == IffId("CLIP")) {
    return new LwoClip;

  } else if (id == IffId("SURF")) {
    return new LwoSurface;

  } else if (id == IffId("BBOX")) {
    return new LwoBoundingBox;

  } else {
    return IffInputFile::make_new_chunk(id);
  }
}