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OSLDeterministic

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Publisher

OLS

Please Note

This entry is from Friday June 5, 2026. The price of the asset may have changed since then.
Please visit our homepage for recent offers and sales. Official and private Unity Asset Store™ sales usually last about 14 days.

Overview

When building lockstep netcode, replay systems, or server-authoritative logic, standard random utilities like UnityEngine.Random or System.Random cannot be used because their results vary between platforms and Unity versions. OSL Deterministic Core solves this problem by providing a pure .NET Standard 2.1 PRNG suite designed from the ground up for strict determinism and high performance.


Key Features

  • Deterministic by Construction: Same seed produces identical sequences across all machines, platforms, and CPU architectures, eliminating desynchronization risks.
  • Zero Allocations on Hot Paths: Performance-critical operations—including RNG advance, dice rolls, deck shuffling, and weighted gacha draws—never allocate managed memory.
  • Integer-First Probability: To completely avoid floating-point drift across different CPUs, APIs like RollPermille and RollProbability utilize strict integer comparisons.
  • Pluggable Gacha & Pity Systems: Includes weighted draw tables (OSLGachaTable) and flexible extension points for pity rules (IPitySystem), with built-in support for Unity ScriptableObjects and JSON serialization.
  • Independent Sub-RNG Streams: Supports deriving multiple statistically independent sub-RNGs from a single master seed using different stream IDs, isolating subsystems so that modifying one roll sequence does not affect others.

Package Content

  • Core Engine: IRandomEngine contract, PCG32 algorithm implementation, and the OSLRandom developer facade.
  • Shuffling: OSLDeckShuffler for in-place, zero-allocation Fisher–Yates shuffling.
  • Gacha & Pity: OSLGachaTable and SimpleHardPity for managed reward configurations.
  • Combat: OSLCombatResolver for reliable dice rolls and integer-based probability checks.
  • Lockstep Demo: A split-screen sample application that runs two independent simulations side-by-side with real-time state hash validation to instantly demonstrate sync integrity.
  • Editor Tests: Comprehensive NUnit EditMode tests covering determinism, statistical distribution, state round-trips, and pity semantics.

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