void iterate()
{
  glm::mat4 model = glm::translate(glm::mat4(1.0f), glm::vec3(-pos_x, -pos_y, -2.0f));

  glm::mat4 view = glm::mat4(1.0f)
    * glm::rotate(glm::mat4(1.0f), glm::radians(delta_x - 90), glm::vec3(1.0f, 0.0f, 0.0f))
    * glm::rotate(glm::mat4(1.0f), glm::radians(delta_z), glm::vec3(0.0f, 0.0f, 1.0f));

  glm::mat4 projection = glm::perspective(45.0f, (float)640 / (float)480, 0.1f, 10.0f);

  glm::mat4 mvp = projection * view * model;

  // Это экземпляры класса Object
  // Код метода Object::draw ниже
  suzanne1->draw(mvp);
  teapot1->draw(mvp);
  bunny1->draw(mvp);
}

void Object::draw(const glm::mat4 &mvp) const
{
  const glm::mat4 transform = glm::translate(mvp, position)
    * glm::rotate(glm::mat4(1.0f), glm::radians(rotation.x), glm::vec3(1.0f, 0.0f, 0.0f))
    * glm::rotate(glm::mat4(1.0f), glm::radians(rotation.y), glm::vec3(0.0f, 1.0f, 0.0f))
    * glm::rotate(glm::mat4(1.0f), glm::radians(rotation.z), glm::vec3(0.0f, 0.0f, 1.0f));

  glUniformMatrix4fv(mvp_uniform, 1, GL_FALSE, glm::value_ptr(transform));

  _model.draw();
}