From 5db408caa0c95276cbbfe537cba76f104795f1c0 Mon Sep 17 00:00:00 2001
From: Beq <BeqJanus@vcs.firestormviewer.org>
Date: Thu, 28 Apr 2022 14:46:40 +0100
Subject: [PATCH] [FIRE-21700] Full bright should remain so at Gamma 0

Fix for explicit use case of gamma 0, full bright will continue to attenuate with all non-zero gamma
---
 .../shaders/class1/deferred/fullbrightF.glsl      | 15 ++++++++++++---
 1 file changed, 12 insertions(+), 3 deletions(-)

diff --git a/indra/newview/app_settings/shaders/class1/deferred/fullbrightF.glsl b/indra/newview/app_settings/shaders/class1/deferred/fullbrightF.glsl
index 99bcba797b..07ba7f5bb7 100644
--- a/indra/newview/app_settings/shaders/class1/deferred/fullbrightF.glsl
+++ b/indra/newview/app_settings/shaders/class1/deferred/fullbrightF.glsl
@@ -54,6 +54,9 @@ vec3 fullbrightScaleSoftClip(vec3 light);
 uniform float minimum_alpha;
 #endif
 
+// <FS> Fullbright fog fix w/ gamma 0 workaround.
+uniform float gamma;
+
 void main() 
 {
 #ifdef HAS_DIFFUSE_LOOKUP
@@ -72,9 +75,15 @@ void main()
 #endif
 
 	color.rgb *= vertex_color.rgb;
-	// <FS> Fullbright fog fix
-	color.rgb = fullbrightAtmosTransport(color.rgb);
-	color.rgb = fullbrightScaleSoftClip(color.rgb);
+	// <FS> Fullbright fog fix w/ gamma 0 workaround.
+	// color.rgb = fullbrightAtmosTransport(color.rgb);
+	// color.rgb = fullbrightScaleSoftClip(color.rgb);
+	if(gamma != 0.)
+	{
+		color.rgb = fullbrightAtmosTransport(color.rgb);
+		color.rgb = fullbrightScaleSoftClip(color.rgb);
+	}
+	// </FS> Fullbright fog fix w/ gamma 0 workaround.
 
 #ifdef WATER_FOG
 	vec3 pos = vary_position;