failed: added rothko

failed/rothko.glsl

@@ -0,0 +1,64 @@
+#ifdef GL_ES
+precision mediump float;
+#endif
+
+uniform vec2 u_resolution;
+uniform vec2 u_mouse;
+uniform float u_time;
+
+float random (in vec2 st) { 
+    return fract(sin(dot(st.xy,
+                         vec2(12.9898,78.233)))
+                 * 43758.5453123);
+}
+
+float random(float x) {
+    return fract(sin(x)*10000.);
+}
+
+float noise (in vec2 st) {
+    vec2 i = floor(st);
+    vec2 f = fract(st);
+
+    float a = random(i);
+    float b = random(i + vec2(1.0, 0.0));
+    float c = random(i + vec2(0.0, 1.0));
+    float d = random(i + vec2(1.0, 1.0));
+
+    vec2 u = f*f*(3.0-2.0*f);
+
+    return mix(a, b, u.x) + 
+            (c - a)* u.y * (1.0 - u.x) + 
+            (d - b) * u.x * u.y;
+}
+
+float box(vec2 _st, vec2 _size, float _smoothEdges){
+    _size = vec2(0.5)-_size*0.5;
+    vec2 aa = vec2(_smoothEdges*0.5);
+    vec2 uv = smoothstep(_size,_size+aa,_st);
+    uv *= smoothstep(_size,_size+aa,vec2(1.0)-_st);
+    return uv.x*uv.y;
+}
+
+void main() {
+    vec2 st_ = gl_FragCoord.xy/u_resolution.xy;
+    st_.x *= 3.;
+    vec2 st = fract(st_);
+    vec4 color = vec4(0.);
+
+    if (st_.x < 1.) {
+      color = vec4(random(1.), 0., 0.,1.)*box(st,vec2(1.),0.3);
+    } else if (st_.x > 2.) {
+      color = vec4(0.0, 0.6, 0.3,1.)*box(st,vec2(1.1),0.7)+vec4(0.6, 0., 0.,0.6)*box(st,vec2(1.1),0.4);
+    } else {
+      color = vec4(0.6, 0., 0.,1.)*box(st,vec2(1.1),0.3);
+    }
+
+    st_.x /= 3.;
+    st_ *= 10.;
+    for (float i=0.;i<100.;i++) {
+        color += noise(st_*i)*0.03 * (random(st_*i) > 0.5 ? -1. : 1.);
+    }
+
+    gl_FragColor = vec4(color);
+}