//Udit Mahajan - 2022 - uditmahajan.com

#ifdef GL_ES
precision highp float;
#endif

#define TWO_PI 6.28318530718

varying vec2 vTexCoord;

uniform vec2 u_resolution;
uniform float u_time;

uniform float fxrand1;
uniform float fxrand2;
uniform float fxrand3;
uniform float fxrand4;
uniform float fxrand5;
uniform float fxrand6;
uniform float fxrand7;
uniform float fxrand8;
uniform float fxrand9;
uniform float fxrand10;
uniform float fxrand11;
uniform float fxrand12;
uniform float fxrand13;
uniform float fxrand14;
uniform float fxrand15;
uniform float fxrand16;
uniform float fxrand17;
uniform float fxrand18;
uniform float fxrand19;
uniform float fxrand20;
uniform float fxrand21;
uniform float fxrand22;
uniform float fxrand23;
uniform float fxrand24;
uniform float fxrand25;

uniform float t;

// Box SDF from Inigo Quilez
// https://iquilezles.org/articles/distfunctions2d/
float box( in vec2 p, in vec2 b )
{
    vec2 d = abs(p)-b;
    return length(max(d,0.0)) + min(max(d.x,d.y),0.0);
}

//random function adapted from Patricio Gonzalez Vivo
//https://github.com/patriciogonzalezvivo/lygia/blob/main/generative/random.glsl
float random (vec2 st) {
    return fract(sin(dot(st.xy,
                         vec2(12.9898,77.233)))*
        (143758.5453123 * ((fxrand1)*20.0)));
}

mat2 rotate2d(float angle){
    return mat2(cos(angle),-sin(angle),
                sin(angle),cos(angle));
}

void main() {
    vec2 st = vTexCoord;
    vec2 st2 = vTexCoord;
    vec2 st3 = vTexCoord;

    st = .5 + (vTexCoord * u_resolution.xy - .5* u_resolution.xy) / min(u_resolution.x, u_resolution.y);
    st2 = .5 + (vTexCoord * u_resolution.xy - .5* u_resolution.xy) / min(u_resolution.x, u_resolution.y);
    st3 = .5 + (vTexCoord * u_resolution.xy - .5* u_resolution.xy) / min(u_resolution.x, u_resolution.y);

    float d00, d0, d1, d2, d3, d4, d5 = 0.0;

    float cen = 15.0;

    if(fxrand2<.5){
        cen = -15.;
    }

    float d = distance(st,vec2(cen,cen));
    
    st = st * 1. - .5;
    d0 = (box(st, vec2(.95,.95))) * 4.;
    
    st -= .5;
    st *= rotate2d((d*(fxrand5))+(fxrand6*TWO_PI));
    st += .5;
    
    st*= 1.+(fxrand7*10.);
    st.x -= u_time*t;
    
    vec2 fpos = fract(st);
    vec2 ipos = floor(st);
    
    d1 = (sign(box(fpos, vec2(random(ipos),fxrand8))));    
    
    st2 -= .5;
    st2 *= rotate2d(mod(d*tan(d*15.*fxrand9)*cos(d*15.*fxrand10)*(50.*fxrand11)-(u_time*t*.5),(fxrand12*.05))+(1.25*TWO_PI*.5));
    st2 += .5;
    
    st2*= (100.*fxrand13);
    st2.x += u_time*t;
    
    vec2 fpos2 = fract(st2);
    vec2 ipos2 = floor(st2);
    d2 = sign(box(fpos2, vec2(random(ipos2)*fxrand14,1.)));
    
    d3 = sign(box(fpos, vec2(random(ipos2),1.)));
    
    st3 -= .5;
    st3 *= rotate2d(mod(d*tan(d*15.*fxrand15)*cos(d*15.*fxrand16)*(50.*fxrand17)+(u_time*t),fxrand18)+(1.25*TWO_PI*.5));
    st3 += .5;
    
    st3*= (10.*fxrand19);
    st3.x += u_time*t;
    
    vec2 fpos3 = fract(st3);
    vec2 ipos3 = floor(st3);
    d4 = sign(box(fpos3, vec2(random(ipos3)*fxrand20,fxrand21)));
    
    vec3 col0 = vec3(d0);
    vec3 col1 = vec3(d1+d2+d3+d4)*vec3(fxrand22,fxrand23,fxrand24);
    
    vec3 color = max(col0,col1);
    
    color = mix(color, vec3(d3), (tan(st.y*10.*fxrand25)*.25)+(sin(st.x*15.*fxrand4)*fxrand5));

    if(fxrand3>=.75){
        color = 1.-color;
    }
    
    gl_FragColor = vec4((1.-color),1.0);
}