From e51760ab5e6d698b26b60e1811e7afce62be55d0 Mon Sep 17 00:00:00 2001
From: yum <yum.food.vr@gmail.com>
Date: Mon, 7 Oct 2024 14:41:33 -0700
Subject: Fix center eye toggle in rim lighting

Also add bayer dithering logic (not used yet).
---
 poi.cginc | 23 +++++++++++++++++++++++
 1 file changed, 23 insertions(+)

(limited to 'poi.cginc')

diff --git a/poi.cginc b/poi.cginc
index f5019d7..6a0d5f3 100644
--- a/poi.cginc
+++ b/poi.cginc
@@ -123,4 +123,27 @@ float3 getPoiLightingIndirect() {
   return BetterSH9(float4(0, 0, 0, 1));
 }
 
+inline half Dither8x8Bayer(int x, int y)
+{
+  // Premultiplied by 1/64
+  const half dither[ 64 ] = {
+    0.015625, 0.765625, 0.203125, 0.953125, 0.06250, 0.81250, 0.25000, 1.00000,
+    0.515625, 0.265625, 0.703125, 0.453125, 0.56250, 0.31250, 0.75000, 0.50000,
+    0.140625, 0.890625, 0.078125, 0.828125, 0.18750, 0.93750, 0.12500, 0.87500,
+    0.640625, 0.390625, 0.578125, 0.328125, 0.68750, 0.43750, 0.62500, 0.37500,
+    0.046875, 0.796875, 0.234375, 0.984375, 0.03125, 0.78125, 0.21875, 0.96875,
+    0.546875, 0.296875, 0.734375, 0.484375, 0.53125, 0.28125, 0.71875, 0.46875,
+    0.171875, 0.921875, 0.109375, 0.859375, 0.15625, 0.90625, 0.09375, 0.84375,
+    0.671875, 0.421875, 0.609375, 0.359375, 0.65625, 0.40625, 0.59375, 0.34375
+  };
+  int r = y * 8 + x;
+  return dither[r];
+}
+
+half calcDither(half2 grabPos)
+{
+  return Dither8x8Bayer(glsl_mod(grabPos.x, 8), glsl_mod(grabPos.y, 8));
+}
+
+
 #endif  // __POI_INC
-- 
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