// title: Mix #ifdef GL_ES precision mediump float; #endif uniform vec2 u_resolution; uniform vec2 u_mouse; uniform float u_time; vec2 random2(vec2 st){ st=vec2(dot(st,st.yx), dot(st,vec2(-.220,-.640)*st.yx)); return-1.+2.*fract(sin(st)*500.); } float noise(vec2 st){ vec2 i=floor(st); vec2 f=fract(st); vec2 u=f*f*(3.-2.*f); return mix(mix(dot(random2(i+vec2(0.,0.)),f-vec2(0.,0.)), dot(random2(i+vec2(1.,0.)),f-vec2(1.,0.)),u.x), mix(dot(random2(i+vec2(0.,1.)),f-vec2(0.,1.)), dot(random2(i+vec2(1.,1.)),f-vec2(1.,1.)),u.x),u.y); } void main(){ vec2 st=gl_FragCoord.xy/u_resolution; st.x*=u_resolution.x/u_resolution.y; vec3 color=vec3(0.); float t=1.; // Uncomment to animate t=abs(1.-sin(u_time*.1)+.5)*50.; // Comment and uncomment the following lines: st+=noise(st*2.)*t;// Animate the coordinate space color=vec3(1.)*smoothstep(.18,.2,noise(st));// Big black drops color+=smoothstep(.15,.2,noise(st*10.));// Black splatter color-=smoothstep(.35,.4,noise(st*10.));// Holes on splatter gl_FragColor=vec4(1.-color,1.)-vec4(.45,.25,.05,0); }