obecerra3

// Collection of Open Source Shaping Functions in GLSL
// https://thebookofshaders.com/05/
// https://www.shadertoy.com/view/3lVyDD
//============================================================================================================

#define PI 3.14159265359
#define epsilon 0.00001

float sq(float x) {
    return x*x;

markknol

This help only covers the parts of GLSL ES that are relevant for Shadertoy. For the complete specification please have a look at GLSL ES specification

Language:

Version: WebGL 2.0
Arithmetic: ( ) + - ! * / %
Logical/Relatonal: ~ < > <= >= == != && ||
Bit Operators: & ^ | << >>
Comments: // /* */
Types: void bool int uint float vec2 vec3 vec4 bvec2 bvec3 bvec4 ivec2 ivec3 ivec4 uvec2 uvec3 uvec4 mat2 mat3 mat4 mat?x? sampler2D, sampler3D samplerCube
Format: float a = 1.0; int b = 1; uint i = 1U; int i = 0x1;

ivanpopelyshev

vec2 invBilinear( in vec2 p, in vec2 a, in vec2 b, in vec2 c, in vec2 d )
{
    vec2 e = b-a;
    vec2 f = d-a;
    vec2 g = a-b+c-d;
    vec2 h = p-a;
        
    float k2 = cross2d( g, f );
    float k1 = cross2d( e, f ) + cross2d( h, g );
    float k0 = cross2d( h, e );

DonKarlssonSan

// Hyperboloc functions by toneburst from 
// https://machinesdontcare.wordpress.com/2008/03/10/glsl-cosh-sinh-tanh/
// These are missing in GLSL 1.10 and 1.20, uncomment if you need them 

/*
/// COSH Function (Hyperbolic Cosine)
float cosh(float val)
{
    float tmp = exp(val);
    float cosH = (tmp + 1.0 / tmp) / 2.0;

patriciogonzalezvivo

Please consider using http://lygia.xyz instead of copy/pasting this functions. It expand suport for voronoi, voronoise, fbm, noise, worley, noise, derivatives and much more, through simple file dependencies. Take a look to https://github.com/patriciogonzalezvivo/lygia/tree/main/generative

Generic 1,2,3 Noise

float rand(float n){return fract(sin(n) * 43758.5453123);}

float noise(float p){
	float fl = floor(p);
  float fc = fract(p);