From 00a83e798f7934962facba8e7864b215e1d94701 Mon Sep 17 00:00:00 2001
From: Zack Middleton <zturtleman@gmail.com>
Date: Sat, 4 Jul 2015 19:17:58 -0500
Subject: Apply greyscaling to fog blocks

---
 src/renderergl1/tr_shader.c | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)

(limited to 'src/renderergl1/tr_shader.c')

diff --git a/src/renderergl1/tr_shader.c b/src/renderergl1/tr_shader.c
index 2a66afd0..34d6d64e 100644
--- a/src/renderergl1/tr_shader.c
+++ b/src/renderergl1/tr_shader.c
@@ -1569,6 +1569,23 @@ static qboolean ParseShader( char **text )
 				return qfalse;
 			}
 
+			if ( r_greyscale->integer )
+			{
+				float luminance;
+
+				luminance = LUMA( shader.fogParms.color[0], shader.fogParms.color[1], shader.fogParms.color[2] );
+				VectorSet( shader.fogParms.color, luminance, luminance, luminance );
+			}
+			else if ( r_greyscale->value )
+			{
+				float luminance;
+
+				luminance = LUMA( shader.fogParms.color[0], shader.fogParms.color[1], shader.fogParms.color[2] );
+				shader.fogParms.color[0] = LERP( shader.fogParms.color[0], luminance, r_greyscale->value );
+				shader.fogParms.color[1] = LERP( shader.fogParms.color[1], luminance, r_greyscale->value );
+				shader.fogParms.color[2] = LERP( shader.fogParms.color[2], luminance, r_greyscale->value );
+			}
+
 			token = COM_ParseExt( text, qfalse );
 			if ( !token[0] ) 
 			{
-- 
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