63.frag

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

vec2 rotate( vec2 matrix, float angle ) {
    return vec2( matrix.x*cos(radians(angle)), matrix.x*sin(radians(angle)) ) + vec2( matrix.y*-sin(radians(angle)), matrix.y*cos(radians(angle)) );
}

void main(void) {
    vec2 st = gl_FragCoord.xy / resolution.xy;
    vec2 uv = -1. + 2. * st;
    float div = 18.0;
    float speed = 1.0;
    vec2 rr = rotate(uv, cos(time * 1.0) * 90.0);
    vec2 rg = rotate(uv, cos(time * 1.1) * -90.0);
    vec2 rb = rotate(uv, sin(time * 1.2) * 90.0);
    float r = mod(rr.x + mod(time / div * speed * 10.0, 1.0), 1.0 / div) * div;
    float g = mod(rg.y + mod(time / div * speed * 10.0, 1.0), 1.0 / div) * div;
    float b = mod(rb.x - mod(time / div * speed * 10.0, 1.0), 1.0 / div) * div;
    fragColor = TDOutputSwizzle(vec4(r, g, b, 1.0));
}