JPStandardCoreForward.cginc

#if _USESUBLIGHT
   static bool _UseSubLight = true;
   #else
   static bool _UseSubLight = false;
#endif

uniform half _SubLightScale;

#if USE_SECOND_DIRECTIONAL_LIGHT
    half2 RoL = max(0, half2(dot(ReflectionVector, DirectionalLightDirection), dot(ReflectionVector, _WorldSpaceLightPos1.xyz)));
    half2 PhongSpecular = PhongApprox(Roughness, RoL);
   half3 Directional = (Shadow * NoL) * DirectionalLightColor * (DiffuseColor + SpecularColor * PhongSpecular.x);

    half NoL2 = max(0, dot(normalWorld, _WorldSpaceLightPos1.xyz));
   Directional += NoL2 * _LightColor1 * (DiffuseColor + SpecularColor * PhongSpecular.y);
#else
    half3 halfDir = normalize(DirectionalLightDirection + s.viewdir);
   half3 invhalfDir = -(normalize(DirectionalLightDirection + s.viewdir));
    half RoL = max(0, dot(ReflectionVector, DirectionalLightDirection));
    half RoLDual = max(0, dot(ReflectionVector , -s.viewdir * invhalfDir)) * _SubLightScale;
   half LoH = max(0, dot(DirectionalLightDirection, halfDir));
   half normalizationTerm = (Roughness + 0.5) * 4.0;
#if DUALLOBE
   half specularTermBeckMann = (2.0 * PhongApprox(RoughnessBeckMan, RoL) / (max(0.1h,  LoH) * normalizationTerm));
   half specularTerm = (PhongApprox(Roughness, RoL) / 2 + specularTermBeckMann) ;
#else
   half specularTerm = PhongApprox(Roughness, RoL);
#endif