3 files changed, 7 insertions, 8 deletions
diff --git a/indra/newview/app_settings/shaders/class1/deferred/skyF.glsl b/indra/newview/app_settings/shaders/class1/deferred/skyF.glsl
index cc5280d929..596e9321e8 100644
--- a/indra/newview/app_settings/shaders/class1/deferred/skyF.glsl
+++ b/indra/newview/app_settings/shaders/class1/deferred/skyF.glsl
@@ -86,7 +86,9 @@ void main()
     pos = env_mat * pos;
     vec2 texCoord = vec2(atan(pos.z, pos.x) + PI, acos(pos.y)) / vec2(2.0 * PI, PI);
     vec3 color = textureLod(environmentMap, texCoord.xy, 0).rgb * sky_hdr_scale;
-    color = min(color, vec3(8192*8192*16));
+    color = min(color, vec3(8192*8192*16)); // stupidly large value arrived at by binary search -- avoids framebuffer corruption from some HDRIs
+
+    frag_data[2] = vec4(0.0,0.0,0.0,GBUFFER_FLAG_HAS_HDRI);
 #else
 
     // Potential Fill-rate optimization.  Add cloud calculation 
@@ -104,12 +106,11 @@ void main()
     color.rgb *= 2.;
     color.rgb = clamp(color.rgb, vec3(0), vec3(5));
 
+    frag_data[2] = vec4(0.0,0.0,0.0,GBUFFER_FLAG_SKIP_ATMOS);
 #endif
 
     frag_data[0] = vec4(0);
     frag_data[1] = vec4(0);
-    frag_data[2] = vec4(0.0,0.0,0.0,GBUFFER_FLAG_SKIP_ATMOS);
     frag_data[3] = vec4(color.rgb, 1.0);
-
 }
 
diff --git a/indra/newview/app_settings/shaders/class3/deferred/softenLightF.glsl b/indra/newview/app_settings/shaders/class3/deferred/softenLightF.glsl
index 5cc7ea698a..9b9739ba22 100644
--- a/indra/newview/app_settings/shaders/class3/deferred/softenLightF.glsl
+++ b/indra/newview/app_settings/shaders/class3/deferred/softenLightF.glsl
@@ -191,11 +191,12 @@ void main()
     }
     else if (GET_GBUFFER_FLAG(GBUFFER_FLAG_HAS_HDRI))
     {
+        // actual HDRI sky, just copy color value
         color = texture(emissiveRect, tc).rgb;
     }
-    else if (!GET_GBUFFER_FLAG(GBUFFER_FLAG_HAS_ATMOS))
+    else if (GET_GBUFFER_FLAG(GBUFFER_FLAG_SKIP_ATMOS))
     {
-        //should only be true of WL sky, just port over base color value
+        //should only be true of WL sky, port over base color value and scale for fake HDR
         color = texture(emissiveRect, tc).rgb;
         color = srgb_to_linear(color);
         color *= sky_hdr_scale;
diff --git a/indra/newview/lldrawpoolwlsky.cpp b/indra/newview/lldrawpoolwlsky.cpp
index a9cc138549..303916110c 100644
--- a/indra/newview/lldrawpoolwlsky.cpp
+++ b/indra/newview/lldrawpoolwlsky.cpp
@@ -470,8 +470,6 @@ void LLDrawPoolWLSky::renderDeferred(S32 pass)
 
     const F32 camHeightLocal = LLEnvironment::instance().getCamHeight();
 
-	gGL.setColorMask(true, false);
-
     LLVector3 const & origin = LLViewerCamera::getInstance()->getOrigin();
 
     if (gPipeline.canUseWindLightShaders())
@@ -488,7 +486,6 @@ void LLDrawPoolWLSky::renderDeferred(S32 pass)
             renderSkyCloudsDeferred(origin, camHeightLocal, cloud_shader);
         }
     }
-    gGL.setColorMask(true, true);
 }