ZXingでQRコード作る

using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using ZXing;
using ZXing.QrCode;
using System.IO;

public class BarcodeMaker : MonoBehaviour
{

    private Texture2D _tex;

    void Start()
    {
        var text = "http://hogehoge.org/";

        // QR コードの画像の幅と高さ
        var width = 256;
        var height = 256;
        var writer = new BarcodeWriter
        {
            Format = BarcodeFormat.QR_CODE,
            Options = new QrCodeEncodingOptions
            {
                Width = width,
                Height = height
            }
        };
        var format = TextureFormat.ARGB32;
        _tex = new Texture2D(width, height, format, false);
        var colors = writer.Write(text);
        _tex.SetPixels32(colors);
        _tex.Apply();
    }

    private void OnGUI(){
        GUI.DrawTexture(new Rect(100, 100, 200, 200), _tex, ScaleMode.StretchToFill);
    }



    // Update is called once per frame
    void Update()
    {
        
    }
}