Bring over my bag of shit shaders and use one as a placeholder for the build status indicator.

assets/shaders/brownian_noise.frag

@@ -0,0 +1,52 @@
+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 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 fbm(in vec2 st, int octaves) {
+  float value = 0.0;
+  float amplitude = 0.5;
+  float frequency = 0.0;
+
+  for(int i = 0; i < octaves; i++) {
+    value += amplitude * noise(st);
+    st *= 2.0;
+    amplitude *= 0.5;
+  }
+
+  return value;
+}
+
+void main() {
+  vec2 st = gl_FragCoord.xy/u_resolution.xy;
+  st.x *= u_resolution.x/u_resolution.y;
+
+  vec3 color = vec3(0.0);
+  vec2 p = st * sqrt(u_mouse.x);
+  int oct = sqrt(u_mouse.y);
+
+  color += fbm(p, oct);
+
+  gl_FragColor = vec4(color, 1.0);
+}