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diff --git a/indra/newview/app_settings/shaders/class2/deferred/alphaF.glsl b/indra/newview/app_settings/shaders/class2/deferred/alphaF.glsl
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+++ b/indra/newview/app_settings/shaders/class2/deferred/alphaF.glsl
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+/** 
+ * @file alphaF.glsl
+ *
+ * $LicenseInfo:firstyear=2007&license=viewerlgpl$
+ * Second Life Viewer Source Code
+ * Copyright (C) 2007, 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
+ * $/LicenseInfo$
+ */
+
+//class2/deferred/alphaF.glsl
+
+/*[EXTRA_CODE_HERE]*/
+
+#define INDEXED 1
+#define NON_INDEXED 2
+#define NON_INDEXED_NO_COLOR 3
+
+out vec4 frag_color;
+
+uniform mat3 env_mat;
+uniform vec3 sun_dir;
+uniform vec3 moon_dir;
+
+#ifdef USE_DIFFUSE_TEX
+uniform sampler2D diffuseMap;
+#endif
+
+in vec3 vary_fragcoord;
+in vec3 vary_position;
+in vec2 vary_texcoord0;
+in vec3 vary_norm;
+
+#ifdef USE_VERTEX_COLOR
+in vec4 vertex_color; //vertex color should be treated as sRGB
+#endif
+
+#ifdef HAS_ALPHA_MASK
+uniform float minimum_alpha;
+#endif
+
+uniform mat4 proj_mat;
+uniform mat4 inv_proj;
+uniform vec2 screen_res;
+uniform int sun_up_factor;
+uniform vec4 light_position[8];
+uniform vec3 light_direction[8];
+uniform vec4 light_attenuation[8]; 
+uniform vec3 light_diffuse[8];
+
+void waterClip(vec3 pos);
+
+#ifdef WATER_FOG
+vec4 applyWaterFogViewLinear(vec3 pos, vec4 color, vec3 sunlit);
+#endif
+
+vec3 srgb_to_linear(vec3 c);
+vec3 linear_to_srgb(vec3 c);
+vec3 legacy_adjust(vec3 c);
+
+vec2 encode_normal (vec3 n);
+vec3 atmosFragLightingLinear(vec3 light, vec3 additive, vec3 atten);
+
+void calcAtmosphericVarsLinear(vec3 inPositionEye, vec3 norm, vec3 light_dir, out vec3 sunlit, out vec3 amblit, out vec3 atten, out vec3 additive);
+
+#ifdef HAS_SUN_SHADOW
+float sampleDirectionalShadow(vec3 pos, vec3 norm, vec2 pos_screen);
+#endif
+
+float getAmbientClamp();
+
+void sampleReflectionProbesLegacy(inout vec3 ambenv, inout vec3 glossenv, inout vec3 legacyenv,
+        vec2 tc, vec3 pos, vec3 norm, float glossiness, float envIntensity, bool transparent);
+
+vec3 calcPointLightOrSpotLight(vec3 light_col, vec3 diffuse, vec3 v, vec3 n, vec4 lp, vec3 ln, float la, float fa, float is_pointlight, float ambiance)
+{
+    // SL-14895 inverted attenuation work-around
+    // This routine is tweaked to match deferred lighting, but previously used an inverted la value. To reconstruct
+    // that previous value now that the inversion is corrected, we reverse the calculations in LLPipeline::setupHWLights()
+    // to recover the `adjusted_radius` value previously being sent as la.
+    float falloff_factor = (12.0 * fa) - 9.0;
+    float inverted_la = falloff_factor / la;
+    // Yes, it makes me want to cry as well. DJH
+    
+    vec3 col = vec3(0);
+
+	//get light vector
+	vec3 lv = lp.xyz-v;
+
+	//get distance
+	float dist = length(lv);
+	float da = 1.0;
+
+    /*if (dist > inverted_la)
+    {
+        return col;
+    }
+
+    clip to projector bounds
+     vec4 proj_tc = proj_mat * lp;
+
+    if (proj_tc.z < 0
+     || proj_tc.z > 1
+     || proj_tc.x < 0
+     || proj_tc.x > 1 
+     || proj_tc.y < 0
+     || proj_tc.y > 1)
+    {
+        return col;
+    }*/
+
+	if (dist > 0.0 && inverted_la > 0.0)
+	{
+        dist /= inverted_la;
+
+		//normalize light vector
+		lv = normalize(lv);
+	
+		//distance attenuation
+		float dist_atten = clamp(1.0-(dist-1.0*(1.0-fa))/fa, 0.0, 1.0);
+		dist_atten *= dist_atten;
+        dist_atten *= 2.0f;
+
+        if (dist_atten <= 0.0)
+        {
+           return col;
+        }
+
+		// spotlight coefficient.
+		float spot = max(dot(-ln, lv), is_pointlight);
+		da *= spot*spot; // GL_SPOT_EXPONENT=2
+
+		//angular attenuation
+		da *= dot(n, lv);
+        da = max(0.0, da);
+
+		float lit = 0.0f;
+
+        float amb_da = 0.0;//ambiance;
+        if (da > 0)
+        {
+		    lit = max(da * dist_atten,0.0);
+            col = lit * light_col * diffuse;
+            amb_da += (da*0.5+0.5) * ambiance;
+        }
+        amb_da += (da*da*0.5 + 0.5) * ambiance;
+        amb_da *= dist_atten;
+        amb_da = min(amb_da, 1.0f - lit);
+
+        // SL-10969 ... need to work out why this blows out in many setups...
+        //col.rgb += amb_da * light_col * diffuse;
+
+        // no spec for alpha shader...
+    }
+    col = max(col, vec3(0));
+    return col;
+}
+
+void main() 
+{
+    vec2 frag = vary_fragcoord.xy/vary_fragcoord.z*0.5+0.5;
+    
+    vec4 pos = vec4(vary_position, 1.0);
+#ifndef IS_AVATAR_SKIN
+    // clip against water plane unless this is a legacy avatar skin
+    waterClip(pos.xyz);
+#endif
+    vec3 norm = vary_norm;
+
+    float shadow = 1.0f;
+
+#ifdef HAS_SUN_SHADOW
+    shadow = sampleDirectionalShadow(pos.xyz, norm.xyz, frag);
+#endif
+
+#ifdef USE_DIFFUSE_TEX
+    vec4 diffuse_tap = texture(diffuseMap,vary_texcoord0.xy);
+#endif
+
+#ifdef USE_INDEXED_TEX
+    vec4 diffuse_tap = diffuseLookup(vary_texcoord0.xy);
+#endif
+
+    vec4 diffuse_srgb = diffuse_tap;
+
+#ifdef FOR_IMPOSTOR
+    vec4 color;
+    color.rgb = diffuse_srgb.rgb;
+    color.a = 1.0;
+
+    float final_alpha = diffuse_srgb.a * vertex_color.a;
+    diffuse_srgb.rgb *= vertex_color.rgb;
+    
+    // Insure we don't pollute depth with invis pixels in impostor rendering
+    //
+    if (final_alpha < minimum_alpha)
+    {
+        discard;
+    }
+
+    color.rgb = diffuse_srgb.rgb;
+    color.a = final_alpha;
+
+#else // FOR_IMPOSTOR
+
+    vec4 diffuse_linear = vec4(srgb_to_linear(diffuse_srgb.rgb), diffuse_srgb.a);
+
+    vec3 light_dir = (sun_up_factor == 1) ? sun_dir: moon_dir; // TODO -- factor out "sun_up_factor" and just send in the appropriate light vector
+
+    float final_alpha = diffuse_linear.a;
+
+#ifdef USE_VERTEX_COLOR
+    final_alpha *= vertex_color.a;
+
+    if (final_alpha < minimum_alpha)
+    { // TODO: figure out how to get invisible faces out of 
+        // render batches without breaking glow
+        discard;
+    }
+
+    diffuse_srgb.rgb *= vertex_color.rgb;
+    diffuse_srgb.rgb = legacy_adjust(diffuse_srgb.rgb);
+    diffuse_linear.rgb = srgb_to_linear(diffuse_srgb.rgb);
+#endif // USE_VERTEX_COLOR
+
+    vec3 sunlit;
+    vec3 amblit;
+    vec3 additive;
+    vec3 atten;
+
+    calcAtmosphericVarsLinear(pos.xyz, norm, light_dir, sunlit, amblit, additive, atten);
+
+    vec3 sunlit_linear = srgb_to_linear(sunlit);
+    vec3 amblit_linear = amblit;
+
+    vec3 irradiance;
+    vec3 glossenv;
+    vec3 legacyenv;
+    sampleReflectionProbesLegacy(irradiance, glossenv, legacyenv, frag, pos.xyz, norm.xyz, 0.0, 0.0, true);
+    
+
+    float da = dot(norm.xyz, light_dir.xyz);
+          da = clamp(da, -1.0, 1.0);
+ 
+    float final_da = da;
+          final_da = clamp(final_da, 0.0f, 1.0f);
+
+    vec4 color = vec4(0.0);
+
+    color.a   = final_alpha;
+
+    vec3 sun_contrib = min(final_da, shadow) * sunlit_linear;
+
+    color.rgb = max(amblit, irradiance);
+
+    color.rgb += sun_contrib;
+
+    color.rgb *= diffuse_linear.rgb;
+
+    color.rgb = atmosFragLightingLinear(color.rgb, additive, atten);
+
+#ifdef WATER_FOG
+    color = applyWaterFogViewLinear(pos.xyz, color, sunlit_linear);
+#endif // WATER_FOG
+
+    vec4 light = vec4(0,0,0,0);
+    
+   #define LIGHT_LOOP(i) light.rgb += calcPointLightOrSpotLight(light_diffuse[i].rgb, diffuse_linear.rgb, pos.xyz, norm, light_position[i], light_direction[i].xyz, light_attenuation[i].x, light_attenuation[i].y, light_attenuation[i].z, light_attenuation[i].w);
+
+    LIGHT_LOOP(1)
+    LIGHT_LOOP(2)
+    LIGHT_LOOP(3)
+    LIGHT_LOOP(4)
+    LIGHT_LOOP(5)
+    LIGHT_LOOP(6)
+    LIGHT_LOOP(7)
+
+    // sum local light contrib in linear colorspace
+#if !defined(LOCAL_LIGHT_KILL)
+    color.rgb += light.rgb;
+#endif // !defined(LOCAL_LIGHT_KILL)
+
+#endif // #else // FOR_IMPOSTOR
+
+#ifdef IS_HUD
+    color.rgb = linear_to_srgb(color.rgb);
+#endif
+
+    frag_color = max(color, vec4(0));
+}
+