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A Noise.* namespace for procedural generation, implemented entirely in Q16.16 fixed point over an integer permutation hash so a seed reproduces the exact same field on every platform and run (native/headless/wasm) — the determinism edge over float noise that drifts across CPUs. - value2 / perlin2 / simplex2 — value, gradient, and simplex noise -> [-1,1] - fbm2(x,y,seed,octaves) — fractal Brownian motion (octaves of simplex) - cellular2 / cellular2_id — Worley F1 distance + nearest-cell id - unit(n) — remap [-1,1] -> [0,1] Covers issue phases 1–2 fully plus cellular from phase 3; domain warp, ridged/ billow, and sample1/sample3 remain as follow-ups. Pure integer IR, C-free; cellular/fbm reuse the math prelude's fx_sqrt. - examples/library/noise.ludic: asserts the invariants a fixed-point generator must hold (Perlin == 0 at lattice points, every sampler within [-1,1], reproducibility, seed sensitivity, non-negative cellular distance). Wired into `x test` (now 52 passed). - docs: a new Noise section + per-symbol pages; inventory and coverage pass. - seed regenerated; `x bootstrap-cfree` fixpoint holds. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
1.2 KiB
1.2 KiB
| id | name | category | kind | tokens | sig | tip | order | ns | member |
|---|---|---|---|---|---|---|---|---|---|
| noise-value2 | Noise.value2 | noise | namespace-method | Noise.value2 | Noise.value2(x, y, seed) -> fixed | 2D value (lattice) noise, deterministic, in [-1, 1]. | 1 | Noise | value2 |
Samples 2D value noise at (x, y) for the given seed and returns a fixed in [-1, 1]. Value noise assigns a pseudo-random value to each integer lattice point and smoothly interpolates between them with a quintic fade — the cheapest generator here, with a slightly blocky, retro character that suits low-detail height fields, dithering, and per-cell variation.
Because it is a pure function of (x, y, seed) in fixed point, the same arguments always produce the same value on every platform. Sample at a fractional frequency (scale the coordinates) to change feature size.
Parameters:
x,y— the sample coordinates (fixed); the integer part picks a cellseed— the field selector; different seeds give independent worlds
program Value {
entry {
let seed = 1337
let n = Noise.value2(fixed(3) / fixed(8), fixed(5) / fixed(8), seed)
print(Math.floor(Noise.unit(n) * fixed(100))) # a 0..100 height
}
}