weird: added another ikeda sketch

weird/ikeda2.glsl

@@ -0,0 +1,34 @@
+// this took way too long
+#ifdef GL_ES
+precision mediump float;
+#endif
+
+uniform vec2 u_resolution;
+uniform float u_time;
+uniform vec2 u_mouse;
+
+float random(in float x) {
+    return fract(sin(x)*1e6);
+}
+
+float col(vec2 st, vec2 v) {
+    float mouse = .3+clamp((u_mouse.x/u_resolution.x), 0., .6);
+    vec2 pos = st+v;
+    return step(mouse, random(70.+pos.x*0.00001));
+}
+
+void main() {
+    vec2 st = gl_FragCoord.xy/u_resolution.xy;
+    st.x *= u_resolution.x/u_resolution.y;
+
+    st *= vec2(10.,50.);
+
+    vec2 s = vec2(u_time*30.)*(vec2(-1.,0.)*random(floor(st.y)+1.));
+
+    vec2 o = vec2(0.02,0.);
+
+    vec3 color = vec3(col(st-o, s), col(st, s), col(st+o, s));
+    color *= step(0.2, fract(st).y);
+
+    gl_FragColor = vec4(1.-color,1.);
+}