From 1c8e1e68f873a5dbf7f42b0928fa7d983d3cd86c Mon Sep 17 00:00:00 2001
From: hyzboy <hyzboy@gmail.com>
Date: Thu, 23 May 2024 22:23:33 +0800
Subject: [PATCH] added PBRNetral Tonemapping

---
 shader/ToneMap/PBRNetral.glsl | 19 +++++++++++++++++++
 1 file changed, 19 insertions(+)
 create mode 100644 shader/ToneMap/PBRNetral.glsl

diff --git a/shader/ToneMap/PBRNetral.glsl b/shader/ToneMap/PBRNetral.glsl
new file mode 100644
index 0000000..1235a55
--- /dev/null
+++ b/shader/ToneMap/PBRNetral.glsl
@@ -0,0 +1,19 @@
+vec3 ToneMapping(vec3 color)
+{
+    const float startCompression = 0.8 - 0.04;
+    const float desaturation = 0.15;
+
+    float x = min(color.r, min(color.g, color.b));
+    float offset = x < 0.08 ? x - 6.25 * x * x : 0.04;
+    color -= offset;
+
+    float peak = max(color.r, max(color.g, color.b));
+    if (peak < startCompression) return color;
+
+    const float d = 1. - startCompression;
+    float newPeak = 1. - d * d / (peak + d - startCompression);
+    color *= newPeak / peak;
+
+    float g = 1. - 1. / (desaturation * (peak - newPeak) + 1.);
+    return mix(color, newPeak * vec3(1, 1, 1), g);
+}