https://github.com/riccardoscalco/glsl-pcg-prng

Glsl implementation of the PCG algorithm for the generation of random numbers.
https://github.com/riccardoscalco/glsl-pcg-prng

glsl glslify hash pcg pcg-random random webgl2

Last synced: 2 days ago
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Glsl implementation of the PCG algorithm for the generation of random numbers.

• Host: GitHub
• URL: https://github.com/riccardoscalco/glsl-pcg-prng
• Owner: riccardoscalco
• License: mit
• Created: 2020-11-27T20:02:59.000Z (almost 4 years ago)
• Default Branch: main
• Last Pushed: 2024-07-12T07:00:54.000Z (3 months ago)
• Last Synced: 2024-09-26T10:43:59.550Z (7 days ago)
• Topics: glsl, glslify, hash, pcg, pcg-random, random, webgl2
• Language: GLSL
• Homepage:
• Size: 82 KB
• Stars: 11
• Watchers: 2
• Forks: 1
• Open Issues: 0
• Metadata Files:
  • Readme: readme.md
  • License: license

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README

        
# glsl-pcg-prng

PCG random number generators ported to an NPM package, so that you can require it from glslify.

The code is based (mostly copied) from https://www.shadertoy.com/view/XlGcRh by Mark Jarzynski.

References:

* Mark Jarzynski and Marc Olano, Hash Functions for GPU Rendering, Journal of

  Computer Graphics Techniques (JCGT), vol. 9, no. 3, 21-38, 2020

  Available online http://jcgt.org/published/0009/03/02/

* https://www.pcg-random.org/

## Install

```sh

npm install glsl-pcg-prng

```

## Usage

Note that **glsl-pcg-prng** needs OpenGL ES 3.0 (WebGL 2.0).

```glsl

#pragma glslify: prng = require(glsl-pcg-prng)

// Create a seed

vec4 seed = vec4(1000., 2000., 3000., 4000.);

// Return one random number, it takes a float or a vec2 as input

float r1 = prng(seed.x);

float r2 = prng(seed.xy);

// Return three random numbers

vec3 r3 = prng(seed.xyz);

// Return four random numbers

vec4 r4 = prng(seed.xyzw);

```

## Demo

* https://github.com/riccardoscalco/glsl-pcg-example

* https://observablehq.com/@riccardoscalco/pcg-random-number-generators-in-glsl.