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| """Schedule-independent counter RNG primitives.""" | |
| from __future__ import annotations | |
| def release_uniform(seed: int, tick: int, edge: int) -> float: | |
| """Return deterministic U[0,1) from seed, tick and edge.""" | |
| for name, value in (("seed", seed), ("tick", tick), ("edge", edge)): | |
| if type(value) is not int: | |
| raise TypeError(f"{name} must be int") | |
| if value < 0: | |
| raise ValueError(f"{name} must be >= 0") | |
| if seed > 0xFFFFFFFF: | |
| raise ValueError("seed must fit uint32") | |
| bits = ( | |
| seed ^ ((tick * 0x9E3779B9) & 0xFFFFFFFF) ^ ((edge * 0x85EBCA6B) & 0xFFFFFFFF) | |
| ) & 0xFFFFFFFF | |
| bits ^= bits >> 16 | |
| bits = (bits * 0x7FEB352D) & 0xFFFFFFFF | |
| bits ^= bits >> 15 | |
| bits = (bits * 0x846CA68B) & 0xFFFFFFFF | |
| bits ^= bits >> 16 | |
| return (bits >> 8) / 16777216.0 | |