#define MAX_OCTAVES 8 uniform vec2 u_resolution; float map(float value,float min1,float max1,float min2,float max2){ return min2+(value-min1)*(max2-min2)/(max1-min1); } float random(in vec2 st){ return fract(sin(dot(st.xy,vec2(12.9898,78.233)))*43758.5453123); } float noise(in vec2 st){ vec2 i=floor(st); vec2 f=fract(st); float a=random(i); float b=random(i+vec2(1.,.0)); float c=random(i+vec2(.0,1.)); float d=random(i+vec2(1.,1.)); vec2 u=f*f*(3.-2.*f); return mix(a,b,u.x)+(c-a)*u.y*(1.-u.x)+(d-b)*u.x*u.y; } float fbm(in vec2 n,in int octaves,in float l){ float v=.0; float lacunarity=2.; float a=.5; n*=l; for(int i=0;i=octaves){break;} v+=a*noise(n); n*=lacunarity; a*=.5; } return v; } float plot(vec2 st,float pct){ return 1.-smoothstep(pct,pct+.005,st.y); } void main(){ vec2 st=gl_FragCoord.xy/u_resolution.xy; st.x*=u_resolution.x/u_resolution.y; float m=st.x*.5+.5; vec3 colorA=vec3(0.44,0.24,1.00); vec3 colorB=vec3(0.00,0.24,0.96); vec3 color=vec3(1.00,0.82,0.40); float y; float pct; float scaleFact; vec2 coords=vec2(51.200001,10.6667); float i; for(float i=4.0;i>0.;i--){ scaleFact=(4.0+i)/i*.25; y=scaleFact*m*(fbm(5.*(m+pow(coords.x,random(coords)))+.001*coords,int(map(i,.0,4.0,5.,7.)),.4/scaleFact)-.5)+(i-1.)*3./(4.0+i); pct=plot(st,y); color=mix(color,vec3(map(i,.0,4.0,colorA.r,colorB.r),map(i,.0,4.0,colorA.g,colorB.g),map(i,.0,4.0,colorA.b,colorB.b)),pct); } gl_FragColor=vec4(color,1.); }
