From aabff3f141aa5e5c058f96b8aad38dfb45f00a5c Mon Sep 17 00:00:00 2001
From: Andrzej Kapolka <drzej.k@gmail.com>
Date: Wed, 22 Jan 2014 14:17:02 -0800
Subject: [PATCH] Adjust the fog density; getting different results on Linux
 vs. OS X.

---
 interface/resources/shaders/grid.frag | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/interface/resources/shaders/grid.frag b/interface/resources/shaders/grid.frag
index c62241cc3e..b9e3baccd4 100644
--- a/interface/resources/shaders/grid.frag
+++ b/interface/resources/shaders/grid.frag
@@ -9,5 +9,7 @@
 //
 
 void main(void) {
-    gl_FragColor = vec4(gl_Color.rgb, exp(-0.25 / gl_FragCoord.w));
+    // use the standard exponential fog calculation
+    const float FOG_DENSITY = 0.5;
+    gl_FragColor = vec4(gl_Color.rgb, exp(-FOG_DENSITY / gl_FragCoord.w));
 }