Hello. It’s been a long time. Let’s ignore that.

In a recent urge to put more FOSS apps on my Android phone, I installed a marvelous application called Shader Editor. The app is basically just a GLSL editor that compiles the code live. You can use then use these shader files to make them animated wallpapers for your phone.

There exists a web-app for this too, for those who don’t like writing code on a phone (it’s a nightmare, really!). It’s called GLSLSandbox. You can hence write the code online and send it to your phone for Shader Editor to make a wallpaper out of it.

So for example writing the following code in the app:

#extension GL_OES_standard_derivatives : enable #ifdef GL_FRAGMENT_PRECISION_HIGH precision highp float; #else precision mediump float; #endif #define PI 3.14159268 uniform vec2 resolution; uniform float time; vec2 invert(vec2 x) { float d=x.x*x.x +x.y*x.y; return vec2( x.x/d,-x.y/d); } vec2 cube(vec2 x) { return vec2(x.x*x.x*x.x- 3.0*x.x*x.y*x.y, -x.y*x.y*x.y +3.0*x.x*x.x*x.y) ; } vec3 design(float scal) { if(abs(scal) <0.54) return vec3(0.350+0.1*sin(scal),0.230,0.25); else return vec3(0.3,0.1+0.05*sin(2.0*scal) ,0.2*scal); } void main(void) { float mx = max(resolution.x, resolution.y); vec2 uv = gl_FragCoord.xy / mx; vec2 center = resolution / mx * 0.5; float t = time * 0.40; float scalar=sin(40.0*uv.x) * sin(t+20.0*uv.x-1.732*20.0*uv.y) * sin(t+20.0*uv.x+1.732*20.0*uv.y); scalar=sin(8.0*scalar) ; gl_FragColor = vec4(design(scalar), 1.0); }

Gives the following result (recorded from GLSLSandbox):

Soon I found myself doodling with this app, through which I created some trippy visuals that I would like to share. I’ll add them soon in a different blogpost.