Circles2.glsl

Circles2.md

GLSL AnimGif Memo

Original GLSL keijiro/ShaderSketches/Fragment/Circles2.glsl

KodeLife-Circles2.glsl

#version 150

uniform float time;
uniform vec2 resolution;
out vec4 fragColor;

float circle(vec2 coord, vec2 seed)
{
    float reso = 16.0;
    float cw = resolution.x / reso;

    vec2 p = mod(coord, cw);
    float d = distance(p, vec2(cw / 2.0));

    float rnd = dot(floor(coord / cw), seed);
    float t = time * 2.0 + fract(sin(rnd)) * 6.2;

    float l = cw * (sin(t) * 0.25 + 0.25);
    return clamp(l - d, 0.0, 1.0);
}

void main()
{
    vec2 p = gl_FragCoord.xy;
    vec2 dp = vec2(7.9438, 0.3335) * time;
    float c1 = circle(p - dp, vec2(323.443, 412.312));
    float c2 = circle(p + dp, vec2(878.465, 499.173));
    float c = max(0.0, c1 - c2);
    fragColor = vec4(c, c, c, 1);
}