noise

Lattice noise over the shared hash of rand: zero_proc_value3(seed, p) in [0, 1), zero_proc_gradient3(seed, p) in [-1, 1], zero_flow_worley(seed, p, jitter), zero_flow_simplex(seed, p), zero_flow_curl(seed, p, freq, amp), and the octave sums zero_noise_fbm_value(seed, p, octaves) / zero_noise_fbm_gradient(seed, p, octaves) (octave o drawn from seed + o, at doubling frequency and halving weight, normalised by the weights). The plane forms zero_proc_value2(seed, p), zero_proc_gradient2(seed, p), zero_noise_fbm2(seed, p, octaves, lacunarity, gain, gradient), zero_noise_fbm_value2 and zero_noise_fbm_gradient2 return the values of proc.noise value2, gradient2 and fbm2. The space forms return the values of proc.noise value3 and gradient3, and Worley, simplex and curl the values the CPU forms of the flow pack's field.worley, field.simplex and field.curl ops compute. Each agrees with its CPU form to f32 rounding of the interpolation.

The nodes field.noise, field.worley, field.simplex, field.curl and texture.noise call these functions through field.call, which reaches every function a kernels/ shader module defines.

#include "@builtin::systems.procgen.kernels.noise"

fn height(p: vec3<f32>) -> f32 { return zero_noise_fbm_gradient(7u, p * 0.1, 4u); }