weird: done with pollock, added splatter in the process

weird/pollock.glsl

@@ -0,0 +1,53 @@
+#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,vec2(127.1,311.7)),
+              dot(st,vec2(269.5,183.3)));
+    return -1.0 + 2.0*fract(sin(st)*43758.5453123);
+}
+
+float noise(vec2 st) {
+    vec2 i = floor(st);
+    vec2 f = fract(st);
+
+    vec2 u = f*f*(3.0-2.0*f);
+
+    return mix( mix( dot( random2(i + vec2(0.0,0.0) ), f - vec2(0.0,0.0) ), 
+                     dot( random2(i + vec2(1.0,0.0) ), f - vec2(1.0,0.0) ), u.x),
+                mix( dot( random2(i + vec2(0.0,1.0) ), f - vec2(0.0,1.0) ), 
+                     dot( random2(i + vec2(1.0,1.0) ), f - vec2(1.0,1.0) ), u.x), u.y);
+}
+
+float shape(vec2 st, float radius) {
+	st = vec2(0.5)-st;
+    float r = length(st)*2.0;
+    float a = atan(st.y,st.x);
+    float m = abs(mod(a,3.14*2.)-3.14)/3.6;
+    float f = radius;
+    f += sin(a*20.);
+    return 1.-smoothstep(f,f+0.01,r);
+}
+
+float splash(vec2 st) {
+   	  return shape(st, .3) - shape(st, .27);
+}
+
+void main() {
+    vec2 st = gl_FragCoord.xy/u_resolution.xy;
+    st.x *= u_resolution.x/u_resolution.y;
+    vec3 color = vec3(0.0);
+
+    st += noise(st*2.);
+    for (int i = 0; i < 160; i++) {
+      color += splash(st*(random2(vec2(float(i)))*3.));
+    }
+    color += smoothstep(.3,.31,noise(st*10.));
+    
+    gl_FragColor = vec4(1.-color,1.0);
+}

weird/splatter_noise.glsl

@@ -0,0 +1,54 @@
+#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,vec2(127.1,311.7)),
+              dot(st,vec2(269.5,183.3)) );
+    return -1.0 + 2.0*fract(sin(st)*43758.5453123);
+}
+
+// Value Noise by Inigo Quilez - iq/2013
+// https://www.shadertoy.com/view/lsf3WH
+float noise(vec2 st) {
+    vec2 i = floor(st);
+    vec2 f = fract(st);
+
+    vec2 u = f*f*(3.0-2.0*f);
+
+    return mix( mix( dot( random2(i + vec2(0.0,0.0) ), f - vec2(0.0,0.0) ), 
+                     dot( random2(i + vec2(1.0,0.0) ), f - vec2(1.0,0.0) ), u.x),
+                mix( dot( random2(i + vec2(0.0,1.0) ), f - vec2(0.0,1.0) ), 
+                     dot( random2(i + vec2(1.0,1.0) ), f - vec2(1.0,1.0) ), u.x), u.y);
+}
+
+float shape(vec2 st, float radius) {
+	st = vec2(0.5)-st;
+    float r = length(st)*2.0;
+    float a = atan(st.y,st.x);
+    float m = abs(mod(a,3.14*2.)-3.14)/3.6;
+    float f = radius;
+    f += (sin(a*20.)*.1*pow(m,2.));
+    return 1.-smoothstep(f,f+0.007,r);
+}
+
+void main() {
+    vec2 st = gl_FragCoord.xy/u_resolution.xy;
+    st.x *= u_resolution.x/u_resolution.y;
+    vec3 color = vec3(0.0);
+
+    float t = 1.0;
+    st += noise(st*2.)*t;
+    for (int i = 0; i < 90; i++) {
+      st += abs(tan(u_time))+0.05;
+   	  color += shape(st, .3);
+      color -= shape(st, .27);
+      color += smoothstep(0.28, .3,noise(st*10.));
+      color -= smoothstep(.35,.4,noise(st*10.));
+    }
+    gl_FragColor = vec4(1.-color,1.0);
+}