Compiling

#ifdef GL_ES precision mediump float; #endif

uniform vec2 u_resolution; uniform float u_time;

uniform sampler2D u_tex0; uniform vec2 u_tex0Resolution;

#include "lygia/sample/clamp2edge.glsl" #define LAPLACIAN_SAMPLER_FNC(TEX, UV) sampleClamp2edge(TEX, UV) #include "lygia/filter/laplacian.glsl"

#include "lygia/draw/digits.glsl"

void main (void) { vec3 color = vec3(0.0); vec2 pixel = 1.0/u_resolution; vec2 st = gl_FragCoord.xy * pixel;

float ix = floor(st.x * 5.0);
float radius = max(1.0, ix * 3.0);

color += laplacian(u_tex0, st, pixel * radius).rgb * 0.5 + 0.5;

color -= digits(st - vec2(ix/5.0 + 0.01, 0.01), radius, 0.);
color -= step(.99, fract(st.x * 5.0));

gl_FragColor = vec4(color,1.0);

}