From 415f6b6bdb56070a0481119d060fcde9a18986d7 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Gef=C3=BCllte=20Taubenbrust?=
 <72752000+GefullteTaubenbrust2@users.noreply.github.com>
Date: Wed, 22 May 2024 21:05:26 +0200
Subject: [PATCH] Update opengl_fragment.glsl

---
 client/shaders/second_stage/opengl_fragment.glsl | 14 ++++++++++----
 1 file changed, 10 insertions(+), 4 deletions(-)

diff --git a/client/shaders/second_stage/opengl_fragment.glsl b/client/shaders/second_stage/opengl_fragment.glsl
index f68310844..99af6c618 100644
--- a/client/shaders/second_stage/opengl_fragment.glsl
+++ b/client/shaders/second_stage/opengl_fragment.glsl
@@ -150,14 +150,20 @@ void main(void)
 		color.rgb *= 0.8 * pow(1.0 - length(uv - vec2(0.5)) * 1.4, 0.9) + 0.3;
 #endif
 
-#ifdef ENABLE_COLOR_GRADING
-		color.rgb = pow(color.rgb * vec3(1.3, 1.0, 0.8), vec3(1.3, 1.0, 0.9));
-#endif
-
 #if ENABLE_TONE_MAPPING
 		color = applyToneMapping(color);
 #endif
 
+#ifdef ENABLE_COLOR_GRADING
+		// ASC CDL color grading
+		const vec3 slope = vec3(1.2, 1.0, 0.8);
+		const vec3 power = vec3(1.25, 1.0, 0.9);
+
+		// Filter out blue pixels, because the color grading tends to wash them out.
+		float blue_factor = clamp((color.b - max(color.r, color.g)) / max(0.01, min(color.r, color.g)), 0.0, 1.0);
+
+		color.rgb = mix(color.rgb, pow(color.rgb * slope, power), pow(1. - blue_factor, 4.));
+#endif
 		color.rgb = applySaturation(color.rgb, saturation);
 	}