NEWS - On the fly

/*
    SHADER
    *Blubb*
    on 14/April/2021
*/
        
    //EDIT ME TO SEE CHANGES IN REALTIME IN THE LOGO
//CLICK AGAIN IN THE LOGO TO CLOSE THiS EDITOR
#ifdef GL_ES
precision mediump float;
#endif

uniform vec2 u_resolution;
uniform vec2 u_mouse;
uniform float u_time;    
uniform sampler2D u_tex0;
uniform vec2 u_tex0Resolution;

float point(vec2 pos) {
    return 0.0;
}

void main() {        
    vec2 uv =  gl_FragCoord.xy/u_resolution.xy;        
    //uv*=4.0;            
    
    float pct = 0.0;
    float n = 0.25;
    float m = 1.75;
    float radius = 0.0625;
    float bcn = 0.0;
    float klr = 0.0;
    float lju = 0.0;
    float utr = 0.0;
    float center = -1.0;
    vec2 apoint = vec2(1.5, 0.50);
    vec3 color = vec3(pct);
    vec4 text = texture2D(u_tex0, uv);

// barcelona
    bcn = (distance(uv * 2.0, vec2(n * sin(u_time * 0.31) / 2.0 + 1.0, n * sin(u_time * 0.8) * 2.0 + 1.0)));
    // karlsruhe
    klr = (distance(uv * 2.0, vec2(n * cos(u_time * 0.67) + 1.0, m * cos(u_time * 0.21) / 2.0 + 1.0)));
    // ljudmilla
    lju = (distance(uv * 2.0, vec2(m * cos(u_time * 0.59) / 2.0 + 1.0, n * sin(u_time * 0.1) + 1.0)));
    // utrecht
    utr = (distance(uv * 2.0, vec2(m * cos(u_time * 0.43) / 2.0 + 1.0, m * sin(u_time) / 2.0 + 1.0)));
    
    pct = 1.0 - sin(1.0 - text.x) * 20.0;
    pct /= bcn * klr * lju * utr - radius;
    
    
    pct = smoothstep(0.010, 0.025, pct ); // black
    pct *= 50.0;
    
    color *= text.xyz;
    color = vec3(pct);

gl_FragColor = 1.0-vec4(color,1.0);
}

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