1 files changed, 25 insertions, 9 deletions
diff --git a/indra/newview/app_settings/shaders/class1/deferred/luminanceF.glsl b/indra/newview/app_settings/shaders/class1/deferred/luminanceF.glsl
index b9337a357f..95b2f80e06 100644
--- a/indra/newview/app_settings/shaders/class1/deferred/luminanceF.glsl
+++ b/indra/newview/app_settings/shaders/class1/deferred/luminanceF.glsl
@@ -1,32 +1,32 @@
-/**
+/** 
  * @file luminanceF.glsl
  *
  * $LicenseInfo:firstyear=2023&license=viewerlgpl$
  * Second Life Viewer Source Code
  * Copyright (C) 2023, Linden Research, Inc.
- *
+ * 
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Lesser General Public
  * License as published by the Free Software Foundation;
  * version 2.1 of the License only.
- *
+ * 
  * This library is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  * Lesser General Public License for more details.
- *
+ * 
  * You should have received a copy of the GNU Lesser General Public
  * License along with this library; if not, write to the Free Software
  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
- *
+ * 
  * Linden Research, Inc., 945 Battery Street, San Francisco, CA  94111  USA
  * $/LicenseInfo$
  */
-
+ 
 
 /*[EXTRA_CODE_HERE]*/
 
-// take a luminance sample of diffuseRect and emissiveRect
+// take a luminance sample of diffuseRect and emissiveRect 
 
 out vec4 frag_color;
 
@@ -34,6 +34,8 @@ in vec2 vary_fragcoord;
 
 uniform sampler2D diffuseRect;
 uniform sampler2D emissiveRect;
+uniform sampler2D normalMap;
+uniform float diffuse_luminance_scale;
 
 float lum(vec3 col)
 {
@@ -41,11 +43,25 @@ float lum(vec3 col)
     return dot(l, col);
 }
 
-void main()
+void main() 
 {
     vec2 tc = vary_fragcoord*0.6+0.2;
     tc.y -= 0.1; // HACK - nudge exposure sample down a little bit to favor ground over sky
-    vec3 c = texture(diffuseRect, tc).rgb + texture(emissiveRect, tc).rgb;
+    vec3 c = texture(diffuseRect, tc).rgb;
+    
+    vec4  norm         = texture(normalMap, tc);
+
+    if (!GET_GBUFFER_FLAG(GBUFFER_FLAG_HAS_HDRI) &&
+        !GET_GBUFFER_FLAG(GBUFFER_FLAG_SKIP_ATMOS))
+    {
+        // Apply the diffuse luminance scale to objects but not the sky
+        // Prevents underexposing when looking at bright environments
+        // while still allowing for realistically bright skies.
+        c *= diffuse_luminance_scale;
+    }
+
+    c += texture(emissiveRect, tc).rgb;
+
     float L = lum(c);
     frag_color = vec4(max(L, 0.0));
 }