From 9de1f91daedaa7676909d09a7524afb8d9a23d92 Mon Sep 17 00:00:00 2001
From: Dave Houlton <euclid@lindenlab.com>
Date: Fri, 21 Aug 2020 16:49:11 -0600
Subject: [PATCH] SL-13743 revert part of SL-12978 change that broke low-angle
sunlight
---
.../shaders/class1/windlight/atmosphericsFuncs.glsl | 9 +++++++--
1 file changed, 7 insertions(+), 2 deletions(-)
diff --git a/indra/newview/app_settings/shaders/class1/windlight/atmosphericsFuncs.glsl b/indra/newview/app_settings/shaders/class1/windlight/atmosphericsFuncs.glsl
index b7741ff48d2..140d788ffff 100644
--- a/indra/newview/app_settings/shaders/class1/windlight/atmosphericsFuncs.glsl
+++ b/indra/newview/app_settings/shaders/class1/windlight/atmosphericsFuncs.glsl
@@ -81,8 +81,13 @@ void calcAtmosphericVars(vec3 inPositionEye, vec3 light_dir, float ambFactor, ou
haze_weight = vec4(haze_density) / temp1;
//(TERRAIN) compute sunlight from lightnorm only (for short rays like terrain)
- // SL-12978: temp2.y = 1; optimized away
- sunlight *= exp(-light_atten);
+ temp2.y = max(0.0, tmpLightnorm.y);
+ if (abs(temp2.y) > 0.000001f)
+ {
+ temp2.y = 1. / abs(temp2.y);
+ }
+ temp2.y = max(0.0000001f, temp2.y);
+ sunlight *= exp(-light_atten * temp2.y);
// main atmospheric scattering line integral
temp2.z = Plen * dens_mul;
--
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