noise test

src/Orange/Render/Shaders/fs_HDRTest.frag

@@ -41,6 +41,12 @@ vec3 pqToNits(vec3 pq)
     return 10000.0 * pow(num / den, vec3(oo_m1));
 }
 
+float gold_noise(vec2 xy, float seed)
+{
+    const float PHI = 1.61803398874989484820459;
+    return fract(tan(distance(xy*PHI, xy)*seed)*xy.x);
+}
+
 void main()
 {
     outColor = vec4(0.0, 0.0, 0.0, 1.0);
@@ -123,4 +129,20 @@ void main()
 
         outColor = vec4(nitsToPq(vec3(0, 0, value)), 1.0);
     }
+    else if (test == 10)
+    {
+        const float seed = fract(time);
+
+        vec3 value = vec3(gold_noise(coords.xy, seed + 0.2));
+
+        outColor = vec4(nitsToPq(value), 1.0);
+    }
+    else if (test == 11)
+    {
+        const float seed = fract(time);
+
+        vec3 value = vec3(gold_noise(coords.xy, seed + 0.1), gold_noise(coords.xy, seed + 0.2), gold_noise(coords.xy, seed + 0.2));
+
+        outColor = vec4(nitsToPq(value), 1.0);
+    }
 }