A pure Rust SIMD accelerated noise library

5 years ago

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SIMDNoise

Super fast SIMD noise library for Rust. PRs welcome!

Available on crates.io .

Documentation .

Requires nightly until 1.27 drops

Features

SSE2, SSE41, and AVX2 instruction sets, along with non SIMD fallback
AVX2 version also leverages FMA3
Runtime detection picks the best available instruction set
Simplex noise, fractal brownian motion, turbulence, and ridge
2d and 3d

Benchmarks

Intel(R) Core(TM) i7-6700 CPU @ 3.40GHz Single Threaded

2D 1000x1000 FBM Noise, 3 Octaves

scalar_2d ... bench: 74,207,703 ns/iter (+/- 2,184,952)
sse2_2d ... bench: 23,863,725 ns/iter (+/- 746,331)
sse41_2d ... bench: 22,440,765 ns/iter (+/- 995,336)
avx2_2d ... bench: 12,022,253 ns/iter (+/- 508,793)

3D 100x100x100 FBM Noise, 3 Octaves

scalar_3d ... bench: 102,543,499 ns/iter (+/- 3,310,472)
sse2_3d ... bench: 39,991,825 ns/iter (+/- 1,043,332)
sse41_3d ... bench: 38,852,436 ns/iter (+/- 1,350,831)
avx2_3d ... bench: 23,231,237 ns/iter (+/- 777,420)

Todo

AVX512 support
ARM NEON support
Voroni, Cell, and other noise types

Get a block of noise with runtime SIMD detection

The library will, at runtime, pick the fastest available options between SSE2, SSE41, and AVX2

use simdnoise::*;

// Set up noise type and parameters
let noise_type = simdnoise::NoiseType::FBM {
      freq: 0.04,
      lacunarity: 0.5,
      gain: 2.0,
      octaves: 3,
}; 

// Get a block of 2d 800x600 noise, with no scaling of resulting values
// min and max values are returned so you can apply your own scaling
let (an_f32_vec,min,max) = simdnoise::get_2d_noise(0.0, 800, 0.0, 600, noise_type);

// Get a block of 200x200x200 3d noise
let (an_f32_vec,min,max) = simdnoise::get_3d_noise(0.0, 200, 0.0, 200,0.0, 200, noise_type);

// Get a block of noise scaled between -1 and 1
let an_f32_vec = simdnoise::get_2d_scaled_noise(0.0, 800, 0.0, 600, noise_type,-1.0,1.0);

Call noise functions directly

Sometimes you need something other than a block, like the points on the surface of a sphere. Sometimes you may want to use SSE41 even with AVX2 is available

// get a block of 100x100 sse41 noise, skip runtime detection
let (noise,min,max) = simdnoise::sse41::get_2d_noise(0.0,100,0.0,100,noise_type);

// send your own SIMD x,y values to the noise functions directly
unsafe {
  // sse2 simplex noise
  let x = _mm_set1_ps(5.0);
  let y = _mm_set1_ps(10.0);
  let f : __m128 = simdnoise::sse2::simplex_2d(x,y);
  
  // avx2 turbulence
  let x = _mm256_set1_ps(5.0);
  let y = _mm256_set1_ps(10.0);
  let freq = _mm_256_set1_ps(1.0);
  let lacunarity = _mm256_set1_ps(0.5);
  let gain = _mm256_set1_ps(2.0);
  let octaves = 3;
  let f_turbulence : __m256 = simdnoise::avx2::turbulence_2d(x,y,freq,lacunarity,gain,octaves);
    
}

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