#ifdef GL_ES
precision mediump float;
#endif

#define FBM_OCTAVES 6

#include "lygia/generative/fbm.glsl"

uniform vec2 u_resolution;
uniform vec2 u_mouse;
uniform vec3 u_color_start;
uniform vec3 u_color_end;
uniform vec2 u_offset;
uniform float u_time;

void main(){
    vec2 st=(gl_FragCoord.xy+u_offset)/u_resolution;
    
    vec2 q=vec2(0.);
    q.x=fbm(st);
    q.y=fbm(st+vec2(1.));
    
    q=q*.5+.5;
    vec2 r=vec2(0.);
    r.x=fbm(st+1.*q+vec2(1.7,9.2)+.0115*u_time);
    r.y=fbm(st+1.*q+vec2(8.3,2.8)+.0226*u_time);
    r=r*.5+.5;
    
    float f=fbm(st+r);
    
    vec3 color=mix(u_color_start,u_color_end,f*.3);
    
    gl_FragColor=vec4(color,1.);
}