SL-10856

Remove ambient clamp to keep shadows dark.

Partial fix for class 3 ambient term being wrong.

indra/newview/app_settings/shaders/class1/deferred/alphaF.glsl

@@ -225,7 +225,6 @@ void main()
     float ambient = da;
     ambient *= 0.5;
     ambient *= ambient;
-    ambient = max(getAmbientClamp(), ambient); // keeps shadows dark
     ambient = 1.0 - ambient;
 
     vec3 sun_contrib = min(final_da, shadow) * sunlit;

indra/newview/app_settings/shaders/class1/deferred/materialF.glsl

@@ -323,7 +323,6 @@ void main()
     float ambient = da;
     ambient *= 0.5;
     ambient *= ambient;
-    ambient = max(getAmbientClamp(), ambient);
     ambient = 1.0 - ambient;
 
     vec3 sun_contrib = min(final_da, shadow) * sunlit;

indra/newview/app_settings/shaders/class1/deferred/softenLightF.glsl

@@ -116,7 +116,6 @@ void main()
         float ambient = da;
         ambient *= 0.5;
         ambient *= ambient;
-        ambient = max(getAmbientClamp(), ambient);
         ambient = 1.0 - ambient;
 
         vec3 sun_contrib = final_da * sunlit;

indra/newview/app_settings/shaders/class2/deferred/softenLightF.glsl

@@ -126,7 +126,6 @@ void main()
         float ambient = da;
         ambient *= 0.5;
         ambient *= ambient;
-        ambient = max(getAmbientClamp(), ambient);
         ambient = 1.0 - ambient;
 
         vec3 sun_contrib = scol * final_da * sunlit;

indra/newview/app_settings/shaders/class3/lighting/lightV.glsl

@@ -31,8 +31,8 @@ vec4 sumLights(vec3 pos, vec3 norm, vec4 color);
 
 vec4 calcLighting(vec3 pos, vec3 norm, vec4 color)
 {
-	vec4 c = sumLights(pos, norm, color);
-    c.rgb += atmosAmbient() * color.rgb;
-    return c * 2.0;
+	vec4 c = sumLights(pos, norm, color) * 2.0;
+    c.rgb += atmosAmbient() * color.rgb * 0.5;
+    return c; 
 }