mrange

#define ROT(p)p=Q*dot(Q,p)+cross(Q,p)

// License: Unknown, author: Claude Brezinski, found: https://mathr.co.uk/blog/2017-09-06_approximating_hyperbolic_tangent.html
vec4 tanh_approx(vec4 x) {
  //  Found this somewhere on the interwebs
  //  return tanh(x);
  vec4 x2 = x*x;
  return clamp(x*(27.0 + x2)/(27.0+9.0*x2), -1.0, 1.0);
}

mrange

LINES Multipass Audio Reactive shader

These shaders are designed to be used with kodelife.

Pass 0,2,3,4 are normal full fragment shader setups (ie orthographic projection) Pass 1 uses Perspective projection.

Passes file are prefixed with it's position in the pipeline, 0 coming before 1 and so on. They are suffixed with either _vs or _fs indicating if it's a vertex shader or fragement shader.

Passes might take other passes output as input.

mrange

pos=0

local abs  = math.abs
local exp2 = function(x) return 2.0 ^ x end
local sin  = math.sin
local mod  = function(a, b) return a - math.floor(a / b) * b end  -- GLSL mod (always positive)

local function music(t1)
 local a3 = 0.0
 for i1 = 1, 4 do

mrange

/*
  @title EffectTime testing
  @by mrange
*/

class EffectTime {
  constructor() {
    this.time=0;
    this.n=0;
    this.lastOnset=-1;

mrange

// https://hydra.ojack.xyz/

setFunction({
  name: 'truchet',
  type: 'src',
  inputs: [
    {
      type: 'float',
      name: 'T',
      default: 0.,

mrange

// https://hydra.ojack.xyz/

setFunction({
  name: 'greenapollo',
  type: 'src',
  inputs: [
    {
      type: 'float',
      name: 't',
      default: 0,

mrange

// https://hydra.ojack.xyz/

setFunction({
  name: 'hack',
  type: 'src',
  inputs: [],
  glsl:
	`   
  vec2 P=2.*_st-1.;
  P.x*=resolution.x/resolution.y;

mrange

Snippets for shader devs

⚠️ All text content on this blog is licensed under CC BY-SA 4.0. All code is licensed under CC0. ⚠️

All code assumes shadertoy environment:

// O - output color
// C - pixel coordinate
// iResolution - vec3 uniform containing the resolution, .z is 1 when generating 2D fragments.
void mainImage(out vec4 O, vec2 C) {

mrange

#define _GNU_SOURCE
#include<math.h>
#include<sys/ioctl.h>
#define V for(n=0;n<3;++n)
#define F c+=sprintf(b+c,
      //////////////////////////////////////
     // "Nothing Special"-Posix version  ///
    // by mrange 2026-02-22             ////
   //                                  // //
  // Compile and run with:            //  //

mrange

// "Nothing Special" shader by Mårten Rånge

var terminal = new BrowserTerminal(
    AnsiConsole.Console,
    AnsiConsole.Profile.Width,
    AnsiConsole.Profile.Height);
var renderer = new Renderer(terminal);
var writer = AnsiConsole.Profile.Out.Writer;
writer.Write("\x1b[?25l"); // Hide cursor