Fixed contact shadows on transparent objects

com.unity.render-pipelines.high-definition/HDRP/Lighting/LightEvaluation.hlsl

 void EvaluateLight_Directional(LightLoopContext lightLoopContext, PositionInputs posInput,
                                DirectionalLightData lightData, BakeLightingData bakeLightingData,
                                float3 N, float3 L,
-                               out float3 color, out float attenuation, out float attenuationNoContactShadow)
+                               out float3 color, out float attenuation, out float attenuationNoContactShadows)
+    float  contactShadow = 1.0;
 
     color       = lightData.color;
     attenuation = 1.0; // Note: no volumetric attenuation along shadow rays for directional lights
         // Note: There is no shadowDimmer when there is no shadow mask
 #endif
 
-        attenuationNoContactShadow = attenuation * shadow;
-
-#if (SHADERPASS != SHADERPASS_VOLUMETRIC_LIGHTING)
-        float contactShadow = GetContactShadow(lightLoopContext, lightData.contactShadowIndex);
-        shadow = min(shadow, contactShadow);
+#if (SHADERPASS != SHADERPASS_VOLUMETRIC_LIGHTING && !defined(_SURFACE_TYPE_TRANSPARENT))
+        contactShadow = GetContactShadow(lightLoopContext, lightData.contactShadowIndex);
-    attenuation *= shadow;
+    attenuationNoContactShadows = shadow * attenuation;
+    attenuation *= min(shadow, contactShadow);
 }
 
 //-----------------------------------------------------------------------------
     float  shadowMask    = 1.0;
     float  contactShadow = 1.0;
 
-    attenuationNoContactShadows = 1;
     color       = lightData.color;
     attenuation = SmoothPunctualLightAttenuation(distances, lightData.invSqrAttenuationRadius,
                                                  lightData.angleScale, lightData.angleOffset);
         shadow = lerp(1.0, shadow, lightData.shadowDimmer);
 #endif
 
-        attenuationNoContactShadows = shadow * attenuation;
-
-#if (SHADERPASS != SHADERPASS_VOLUMETRIC_LIGHTING)
+#if (SHADERPASS != SHADERPASS_VOLUMETRIC_LIGHTING && !defined(_SURFACE_TYPE_TRANSPARENT))
-        shadow = min(shadow, contactShadow);
-    attenuation *= shadow;
+    attenuationNoContactShadows = shadow * attenuation;
+    attenuation *= min(shadow, contactShadow);
 
 }
 

com.unity.render-pipelines.high-definition/HDRP/Lighting/LightLoop/LightLoopDef.hlsl

     return _EnvLightDatas[j];
 }
 
-float GetContactShadow(LightLoopContext lightLoopContact, int contactShadowIndex)
+float GetContactShadow(LightLoopContext lightLoopContext, int contactShadowIndex)
 {
     // Here we take the contact shadow value using the contactShadowIndex of the light
     // If the contact shadows are diasbled, it's value is -1 so this function will only
-    return max(lightLoopContact.shadowContext.contactShadow, abs(contactShadowIndex));
+    return max(lightLoopContext.shadowContext.contactShadow, abs(contactShadowIndex));
 }

com.unity.render-pipelines.high-definition/HDRP/Material/Lit/Lit.hlsl

     {
         // Make sure we do not sample the shadow map twice.
         lightData.shadowIndex = -1;
+        //No need to restore as we dont use it later
+        lightData.contactShadowIndex = -1;
     }
 
     float3 color;

com.unity.render-pipelines.high-definition/HDRP/Material/StackLit/StackLit.hlsl

     {
         // Make sure we do not sample the shadow map twice.
         lightData.shadowIndex = -1;
+        //No need to restore as we dont use it later
+        lightData.contactShadowIndex = -1;
     }
 
     float3 color;