Function LoadObjWithCallback

Siv3D/src/ThirdParty/tinyobjloader/tiny_obj_loader.h:2886–3168

}

bool LoadObjWithCallback(std::istream &inStream, const callback_t &callback,
                         void *user_data /*= NULL*/,
                         MaterialReader *readMatFn /*= NULL*/,
                         std::string *warn, /* = NULL*/
                         std::string *err /*= NULL*/) {
  std::stringstream errss;

  // material
  std::map<std::string, int> material_map;
  int material_id = -1;  // -1 = invalid

  std::vector<index_t> indices;
  std::vector<material_t> materials;
  std::vector<std::string> names;
  names.reserve(2);
  std::vector<const char *> names_out;

  std::string linebuf;
  while (inStream.peek() != -1) {
    safeGetline(inStream, linebuf);

    // Trim newline '\r\n' or '\n'
    if (linebuf.size() > 0) {
      if (linebuf[linebuf.size() - 1] == '\n')
        linebuf.erase(linebuf.size() - 1);
    }
    if (linebuf.size() > 0) {
      if (linebuf[linebuf.size() - 1] == '\r')
        linebuf.erase(linebuf.size() - 1);
    }

    // Skip if empty line.
    if (linebuf.empty()) {
      continue;
    }

    // Skip leading space.
    const char *token = linebuf.c_str();
    token += strspn(token, " \t");

    assert(token);
    if (token[0] == '\0') continue;  // empty line

    if (token[0] == '#') continue;  // comment line

    // vertex
    if (token[0] == 'v' && IS_SPACE((token[1]))) {
      token += 2;
      // TODO(syoyo): Support parsing vertex color extension.
      real_t x, y, z, w;  // w is optional. default = 1.0
      parseV(&x, &y, &z, &w, &token);
      if (callback.vertex_cb) {
        callback.vertex_cb(user_data, x, y, z, w);
      }
      continue;
    }

    // normal