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May 4, 2020
Apr 13, 2020
Jun 30, 2020

twigl is an online editor for One tweet shader, with gif generator and sound shader, and broadcast live coding.

get started

$ npm install
$ npm start

screen shot


precision highp float;
uniform float time;
void main(){vec4 p=vec4((gl_FragCoord.xy/4e2),0,-4);for(int i=0;i<9;++i)p+=vec4(sin(-(p.x+time*.2))+atan(p.y*p.w),cos(-p.x)+atan(p.z*p.w),cos(-(p.x+sin(time*.8)))+atan(p.z*p.w),0);gl_FragColor=p;}

Live: DEMO


There are four modes in, each of which has a sub-mode that uses GLSL ES 3.0, or in addition to it, a mode that enables MRT.


This mode is compatible with GLSLSandbox.

The uniform variables are "resolution", "mouse", "time", and "backbuffer".


In this mode, the various uniform variables are in a single-character style.

"r", "m", "t", and "b", respectively.


In this mode, there is no need to declare precision and uniform. They are automatically complemented on the implementation side. Otherwise, it is the same as in geek mode.


In this mode, the description of "void main(){}" can be omitted, and "gl_FragCoord" can be described as "FC". In addition, a variety of GLSL snippets are available.

For more information, please see below.

GLSL snippets in GEEKEST mode

twigl with geekest mode have included simplex-noise, you can call it as follows.

float f = snoise2D(v.xy);
float g = snoise3D(;
float h = snoise4D(v.xyzw);

If you are more concerned with speed than accuracy, the following functions may be more appropriate.

// fract sin noise
float fsnoise(vec2 c){
    return fract(sin(dot(c, vec2(12.9898, 78.233))) * 43758.5453);

// fsnoise for macOS
float fsnoiseDigits(vec2 c){
    return fract(sin(dot(c, vec2(0.129898, 0.78233))) * 437.585453);

// for example
float i = fsnoise(v.xy);
float j = fsnoiseDigits(v.xy);

Other pre-defined constants and functions are as follows.

vec3 hsv(float h, float s, float v){
    vec4 t = vec4(1.0, 2.0 / 3.0, 1.0 / 3.0, 3.0);
    vec3 p = abs(fract(vec3(h) + * 6.0 - vec3(t.w));
    return v * mix(vec3(t.x), clamp(p - vec3(t.x), 0.0, 1.0), s);

mat2 rotate2D(float r){
    return mat2(cos(r), sin(r), -sin(r), cos(r));

mat3 rotate3D(float angle, vec3 axis){
    vec3 a = normalize(axis);
    float s = sin(angle);
    float c = cos(angle);
    float r = 1.0 - c;
    return mat3(
        a.x * a.x * r + c,
        a.y * a.x * r + a.z * s,
        a.z * a.x * r - a.y * s,
        a.x * a.y * r - a.z * s,
        a.y * a.y * r + c,
        a.z * a.y * r + a.x * s,
        a.x * a.z * r + a.y * s,
        a.y * a.z * r - a.x * s,
        a.z * a.z * r + c

const float PI = 3.141592653589793;
const float PI2 = PI * 2.0;

Note that the above snippets are only available in GEEKEST mode.


spite/ccapture.js: A library to capture canvas-based animations at a fixed framerate

jnordberg/gif.js: JavaScript GIF encoding library

Ace - The High Performance Code Editor for the Web

ashima/webgl-noise: Procedural Noise Shader Routines compatible with WebGL

Shadertoy BETA

interface design by @iY0Yi


MIT licensed.

About is an online editor for One tweet shader, with gif generator and sound shader, and broadcast live coding.




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