SL-11330

Put back atten for non-ALM lighting that accounts for inverted lin atten setup of yore.

indra/newview/app_settings/shaders/class1/lighting/lightFuncV.glsl

@@ -38,27 +38,20 @@ float calcPointLightOrSpotLight(vec3 v, vec3 n, vec4 lp, vec3 ln, float la, floa
 	vec3 lv = lp.xyz-v;
 	
 	//get distance
-	float dist = length(lv);
-
-    if (dist > la)
-    {
-        return 0;
-    }
+	float d = length(lv);
 	
 	//normalize light vector
-	lv = normalize(lv);
-
-    fa += 1.0;
-    float dist_atten = min(1.0 - (dist-1.0*(1.0 - fa))/fa, 1.0);	
-
-    float da = max(dot(n, lv), 0.0);
-
+	lv *= 1.0/d;
+	
+	//distance attenuation
+	float da = clamp(1.0/(la * d), 0.0, 1.0);
+	
 	// spotlight coefficient.
 	float spot = max(dot(-ln, lv), is_pointlight);
 	da *= spot*spot; // GL_SPOT_EXPONENT=2
 
 	//angular attenuation
-	da *= dist_atten;
+	da *= calcDirectionalLight(n, lv);
 
 	return da;
 }