add fuzzy clouds shader

.gitea/workflows/release.yml

@@ -122,6 +122,7 @@ jobs:
           echo "  User aur" >> ~/.ssh/config
           ssh-keyscan aur.archlinux.org >> ~/.ssh/known_hosts 2>/dev/null
 
+          rm -rf /tmp/aur-gpupaper
           git clone ssh://aur@aur.archlinux.org/gpupaper.git /tmp/aur-gpupaper
           cp aur/PKGBUILD /tmp/aur-gpupaper/
           cd /tmp/aur-gpupaper

shaders/fuzzy_clouds.frag

@@ -0,0 +1,29 @@
+// i don't remember what i based this off of or if it was just fiddling,
+// found it in my shader list and thought the clouds were pretty good,
+// for what it is
+uniform float time;
+uniform vec2 resolution;
+
+float noise(vec3 p) {
+	float v = 0.0, a;
+	for (a = .85; a > .15; a *=.75) {
+		v += a * abs(dot( sin( .1*time + .1*p.z + .1*p/a) , vec3(a*3.)) );
+		p += p;
+	}
+	return v;
+}
+
+void mainImage(out vec4 o, vec2 u) {
+    float i = 0.0, s = 0.0;
+    o = vec4(0.0);
+    vec3 p = vec3(0.0);
+    vec2 r = resolution;
+    u = ( u+u - r.xy ) / r.y;
+    for( ; i++ < 1e2; ) {
+        p += vec3(u * s, s);
+        s = .1 + .2* abs( 12.-abs(p.y) - noise(p) );
+        o += 1./s;
+    }
+    o = tanh(vec4(5,2,1,0)*o /3e3/ length(u));
+}
+