BurstUlid

Ulid implemented using burst

Installation

• Unity Package by npmjs

  Edit your Packages/manifest.json file like this

  {
    "scopedRegistries": [
      {
        "name": "npm",
        "url": "https://registry.npmjs.org",
        "scopes": [
          "com.libsugar"
        ]
      }
    ],
    "dependencies": {
      "com.libsugar.unity.burstulid": "<version>"
    }
  }
  

  or use gui in unity editor
  config Project Settings -> Package Manager -> Scoped Registeries
  then add package in package manager

How to use

// create
var ulid = BurstUlid.NewUlid();

// use an external randomizer
var rand = new Random(seed);
var ulid = BurstUlid.NewUlid(ref rand);

// random by RNGCryptoServiceProvider
var ulid = BurstUlid.NewUlidCryptoRand();

// to string in managed
var str = ulid.ToString();

// to string in burst
FixedString32Bytes str = ulid.ToFixedString();

// cast to guid
var guid = ulid.ToGuid();

// cast from guid
var ulid = BurstUlid.FromGuid(guid);

// parse string
var ulid = BurstUlid.Parse(str);

// try parse string
if (BurstUlid.TryParse(str, out var ulid)) {}

// get net format (big endian)
v128 net = ulid.ToNetFormat();

Tips

• This package does not require a dependency in package.json,
  you need to manually ensure ↓ dependencies exist

  • Unity.Burst
  • Unity.Mathematics
  • Unity.Collections
  • System.Runtime.CompilerServices.Unsafe
  • System.Text.Json (optional)

• This implementation is not fully compliant with the Ulid Standard

  • No monotonicity

  • Memory layout uses little endian

    You can convert to big endian using ToNetFormat or WriteNetFormatBytes

    var ulid = BurstUlid.NewUlid();
    v128 net_format = ulid.ToNetFormat();
    

    • Binary layout in memory (if memory is Little-Endian)

      0                   1                   2                   3
       0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      |                    32_bit_uint_time_low_0123                  |
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      |    16_bit_uint_time_high_45    |      16_bit_uint_random_01   |
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      |                     32_bit_uint_random_2345                   |
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      |                     32_bit_uint_random_6789                   |
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      

    • Binary layout in net (and ulid stand)

      0                   1                   2                   3
       0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      |                    32_bit_uint_time_high_5432                 |
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      |    16_bit_uint_time_low_10     |      16_bit_uint_random_98   |
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      |                     32_bit_uint_random_7654                   |
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      |                     32_bit_uint_random_3210                   |
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      

• Because some magic is used to bypass the limitation that burst cannot call managed code, so if you want to use it before [RuntimeInitializeOnLoadMethod(RuntimeInitializeLoadType.BeforeSceneLoad)], you need to call InitStatic manually

  BurstUlid.InitStatic();
  

  Use in general unity life cycle, such as Awake, Start, Update can ignore this promotion

Benchmark