init

shaders/other/noise_static_chroma.glsl

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+
+//!DESC Reduce static noise (chroma)
+//!HOOK CHROMA
+//!BIND HOOKED
+
+// Change this to tune the strength of the noise
+// Apparently this has to be float on some setups
+#define STRENGTH 48.0
+
+// PRNG taken from mpv's deband shader
+float mod289(float x)  { return x - floor(x / 289.0) * 289.0; }
+float permute(float x) { return mod289((34.0*x + 1.0) * x); }
+float rand(float x)    { return fract(x / 41.0); }
+
+vec4 hook()  {
+    vec3 _m = vec3(HOOKED_pos, 0.5) + vec3(1.0);
+    float h = permute(permute(permute(_m.x)+_m.y)+_m.z);
+    vec4 noise;
+    noise.x = rand(h); h = permute(h);
+    noise.y = rand(h);
+    return HOOKED_tex(HOOKED_pos) + vec4(STRENGTH/8192.0) * (noise - 0.5);
+}
+