Changed shader functions per api v4 update

Packages/com.verasl.water-system/Shaders/WaterCommon.hlsl

 #define WATER_COMMON_INCLUDED
 
 #define _SHADOWS_SOFT
-#define _SHADOWS_ENABLED
+#define _DIRECTIONAL_SHADOWS
 #define SHADOWS_SCREEN 0
 
 #include "LWRP/ShaderLibrary/Core.hlsl"
 	half fresnelTerm = CalculateFresnelTerm(lerp(IN.normal, half3(0, 1, 0), 0.5), IN.viewDir.xyz);
 
 	// Shadows
-	half shadow = MainLightRealtimeShadowAttenuation(TransformWorldToShadowCoord(IN.posWS));
+	half shadow = DirectionalLightRealtimeShadow(TransformWorldToShadowCoord(IN.posWS));
-	Light mainLight = GetMainLight();
-	half3 ambient = SampleSHPixel(IN.lightmapUVOrVertexSH, IN.normal) * (mainLight.color * mainLight.attenuation) * 0.5;
+	Light mainLight = GetDirectionalLight();
+	half3 ambient = SampleSHPixel(IN.lightmapUVOrVertexSH, IN.normal) * (mainLight.color * mainLight.distanceAttenuation) * 0.5;
 
 	// Reflections
 	half3 reflection = SampleReflections(IN.normal, IN.viewDir.xyz, screenUV.xy, fresnelTerm, 0.0);
 	half depthMulti = 1 / _MaxDepth;
     half3 color = (refraction + caustics) * (1 - foam);
 	color *= Absorption((depth.x - 0.5) * depthMulti);
-	color += Scattering(depth.x * depthMulti) * ambient * saturate(1-length(reflection));// TODO - scattering from main light(maybe additional lights too depending on cost)
+	color += Scattering(depth.x * depthMulti) * ambient * (shadow * 0.5 + 0.5) * saturate(1-length(reflection));// TODO - scattering from main light(maybe additional lights too depending on cost)
 	color *= 1 - foam;
 
 	// Foam lighting
     float fogFactor = IN.fogFactorAndVertexLight.x;
     ApplyFog(comp, fogFactor);
 	return half4(comp, 1);
-	//return half4(waterFX.r, 0, 0, 1); // debug line
+	//return half4(shadow.r, 0, 0, 1); // debug line
 }
 
 #endif // WATER_COMMON_INCLUDED

Packages/com.verasl.water-system/Shaders/WaterLighting.hlsl

 //specular
 half3 Highlights(half3 positionWS, half roughness, half3 normalWS, half3 viewDirectionWS)
 {
-    Light mainLight = GetMainLight();
+    Light mainLight = GetDirectionalLight();
 
     half roughness2 = roughness * roughness;
     half3 halfDir = SafeNormalize(mainLight.direction + viewDirectionWS);
     specularTerm = specularTerm - HALF_MIN;
     specularTerm = clamp(specularTerm, 0.0, 5.0); // Prevent FP16 overflow on mobiles
 #endif
-    return specularTerm * mainLight.color * mainLight.attenuation;
+    return specularTerm * mainLight.color * mainLight.distanceAttenuation;
 }
 
 ///////////////////////////////////////////////////////////////////////////////