From b3acda860fee7b5f895f2d9ca9f080e00f939dde Mon Sep 17 00:00:00 2001
From: min <minish@riseup.net>
Date: Thu, 11 Sep 2025 16:05:50 -0400
Subject: [PATCH] nicer vignette

---
 shader/bg.frag | 23 +++++++++++++----------
 1 file changed, 13 insertions(+), 10 deletions(-)

diff --git a/shader/bg.frag b/shader/bg.frag
index 7042bd7..375b97e 100644
--- a/shader/bg.frag
+++ b/shader/bg.frag
@@ -69,31 +69,34 @@ void main() {
     float slowtime = u_time / 1.3;
     float timing = sin(slowtime) + 1.0;
     // map 0-1 timing value into a slight offset
-    float vig = distf + mix(-0.18, -0.1, timing);
+    // (lower = farther out)
+    float vig = distf + mix(-0.13, -0.1, timing);
 
     // get coords relative to center, and then get angle
     vec2 herer2c = herescaled - center;
     float angle = atan(herer2c.y, herer2c.x);
 
-    // determine our cutoff based on this
+    // determine our offset based on this
     // so it looks wavy
-    float cut = 0.2 + (0.02 * sin(20.0 * angle));
+    float slowtime2 = u_time / 1.2;
+    float slowtime3 = u_time / 1.5;
+    float off = 0.2 + (0.02 * sin(20.0 * angle + slowtime2)) * (1.4 * sin(10.0 * angle + slowtime3));
 
     // apply cutoff if we are too close to center
-    float vigc = vig * step(0.2, vig);
+    float vigc = (vig * step(off / 3.0, vig)) - off;
 
     // randomize noise pattern every second ish
     float fasttime = u_time * 1.1;
     float second = floor(fasttime);
     float noise = snoise(vec2(gl_FragCoord.x * gl_FragCoord.y, second));
 
-    // blend noise and gradient
-    float final = (1.0 - vigc); // - (noise * 0.9);
-    // quantize
-    float finalq = final;
-    // float finalq = floor(final);
+    // quantize vignette colors
+    float vigq = floor((1.0 - vigc) * 13.0) / 13.0;
 
-    gl_FragColor = mix(darker, lighter, finalq);
+    // blend noise
+    float final = vigq;
+
+    gl_FragColor = mix(darker, lighter, final);
     // vec2 c = gl_FragCoord.xy - center;
     // gl_FragColor = vec4(vec3(smoothstep(-PI, PI, atan(c.y, c.x))), 1.0);
 }