Added support to local soft shadows. Added rule to strip soft shadows keyword.

ScriptableRenderPipeline/LightweightPipeline/LWRP/Editor/ShaderPreprocessor.cs

                 !CoreUtils.HasFlag(capabilities, PipelineCapabilities.LocalShadows))
                 return true;
 
+            if (compilerData.shaderKeywordSet.IsEnabled(LightweightKeywords.SoftShadows) &&
+                !CoreUtils.HasFlag(capabilities, PipelineCapabilities.SoftShadows))
+                return true;
+
             return false;
         }
 

ScriptableRenderPipeline/LightweightPipeline/LWRP/LightweightPipeline.cs

             //TIM: Not used in shader for V1 to reduce keywords
             CoreUtils.SetKeyword(cmd, LightweightKeywords.MainLightCookieText, mainLightIndex != -1 && LightweightUtils.IsSupportedCookieType(visibleLights[mainLightIndex].lightType) && visibleLights[mainLightIndex].light.cookie != null);
 
+            bool anyShadowsEnabled = m_ShadowPass.IsDirectionalShadowsEnabled || m_ShadowPass.IsLocalShadowsEnabled;
+            CoreUtils.SetKeyword(cmd, LightweightKeywords.SoftShadowsText, m_ShadowPass.IsSoftShadowsEnabled && anyShadowsEnabled);
             
             // TODO: Remove this. legacy particles support will be removed from Unity in 2018.3. This should be a shader_feature instead with prop exposed in the Standard particles shader.
             CoreUtils.SetKeyword(cmd, "SOFTPARTICLES_ON", m_RequireDepthTexture && m_Asset.RequireSoftParticles);

ScriptableRenderPipeline/LightweightPipeline/LWRP/LightweightPipelineCore.cs

         VertexLights = (1 << 1),
         DirectionalShadows = (1 << 2),
         LocalShadows = (1 << 3),
+        SoftShadows = (1 << 4),
     }
 
     public class LightweightKeywords
         public static readonly string MainLightCookieText = "_MAIN_LIGHT_COOKIE";
         public static readonly string DirectionalShadowsText = "_SHADOWS_ENABLED";
         public static readonly string LocalShadowsText = "_LOCAL_SHADOWS_ENABLED";
+        public static readonly string SoftShadowsText = "_SHADOWS_SOFT";
+        public static readonly string CascadeShadowsText = "_SHADOWS_CASCADE";
         
         public static readonly ShaderKeyword AdditionalLights = new ShaderKeyword(AdditionalLightsText);
         public static readonly ShaderKeyword VertexLights = new ShaderKeyword(VertexLightsText);
         public static readonly ShaderKeyword LocalShadows = new ShaderKeyword(LocalShadowsText);
+        public static readonly ShaderKeyword SoftShadows = new ShaderKeyword(SoftShadowsText);
     }
 
     public partial class LightweightPipeline
 
             if (pipelineAsset.IsLocalShadowsSupported)
                 pipelineCapabilities |= PipelineCapabilities.LocalShadows;
+
+            bool anyShadows = pipelineAsset.IsDirectionalShadowsSupported || pipelineAsset.IsLocalShadowsSupported;
+            if (pipelineAsset.IsSoftShadowsSupported && anyShadows)
+                pipelineCapabilities |= PipelineCapabilities.SoftShadows;
         }
     }
 }

ScriptableRenderPipeline/LightweightPipeline/LWRP/LightweightShadowPass.cs

 
         private void SetShadowCollectPassKeywords(CommandBuffer cmd)
         {
-            CoreUtils.SetKeyword(cmd, "_SHADOWS_SOFT", m_DirectionalShadowmapQuality == LightShadows.Soft);
-            CoreUtils.SetKeyword(cmd, "_SHADOWS_CASCADE", m_ShadowSettings.directionalLightCascadeCount > 1);
+            CoreUtils.SetKeyword(cmd, LightweightKeywords.SoftShadowsText, m_DirectionalShadowmapQuality == LightShadows.Soft);
+            CoreUtils.SetKeyword(cmd, LightweightKeywords.CascadeShadowsText, m_ShadowSettings.directionalLightCascadeCount > 1);
         }
 
         private bool RenderDirectionalCascadeShadowmap(ref CullResults cullResults, ref LightData lightData, ref ScriptableRenderContext context)

ScriptableRenderPipeline/LightweightPipeline/LWRP/ShaderLibrary/Shadows.hlsl

         #else
             float fetchesWeights[9];
             float2 fetchesUV[9];
-            SampleShadow_ComputeSamples_Tent_5x5(_ShadowmapSize, shadowCoord.xy, fetchesWeights, fetchesUV);
+            SampleShadow_ComputeSamples_Tent_5x5(samplingData.shadowmapSize, shadowCoord.xy, fetchesWeights, fetchesUV);
 
             attenuation  = fetchesWeights[0] * SAMPLE_TEXTURE2D_SHADOW(ShadowMap, sampler_ShadowMap, float3(fetchesUV[0].xy, shadowCoord.z));
             attenuation += fetchesWeights[1] * SAMPLE_TEXTURE2D_SHADOW(ShadowMap, sampler_ShadowMap, float3(fetchesUV[1].xy, shadowCoord.z));

ScriptableRenderPipeline/LightweightPipeline/LWRP/Shaders/LightweightStandard.shader

             #pragma multi_compile _ _MIXED_LIGHTING_SUBTRACTIVE
             #pragma multi_compile _ _SHADOWS_ENABLED
             #pragma multi_compile _ _LOCAL_SHADOWS_ENABLED
+            #pragma multi_compile _ _SHADOWS_SOFT
 
             // -------------------------------------
             // Unity defined keywords

ScriptableRenderPipeline/LightweightPipeline/LWRP/Shaders/LightweightStandardSimpleLighting.shader

             #pragma multi_compile _ _MIXED_LIGHTING_SUBTRACTIVE
             #pragma multi_compile _ _SHADOWS_ENABLED
             #pragma multi_compile _ _LOCAL_SHADOWS_ENABLED
+            #pragma multi_compile _ _SHADOWS_SOFT
 
             // -------------------------------------
             // Unity defined keywords

ScriptableRenderPipeline/LightweightPipeline/LWRP/Shaders/Terrain/LightweightStandardTerrain.shader

             #pragma multi_compile _ _VERTEX_LIGHTS
             #pragma multi_compile _ _MIXED_LIGHTING_SUBTRACTIVE
             #pragma multi_compile _ _SHADOWS_ENABLED
+            #pragma multi_compile _ _LOCAL_SHADOWS_ENABLED
+            #pragma multi_compile _ _SHADOWS_SOFT
 
             // -------------------------------------
             // Unity defined keywords

ScriptableRenderPipeline/LightweightPipeline/LWRP/Shaders/Terrain/LightweightStandardTerrainAddPass.shader

             #pragma multi_compile _ _VERTEX_LIGHTS
             #pragma multi_compile _ _MIXED_LIGHTING_SUBTRACTIVE
             #pragma multi_compile _ _SHADOWS_ENABLED
+            #pragma multi_compile _ _LOCAL_SHADOWS_ENABLED
+            #pragma multi_compile _ _SHADOWS_SOFT
 
             // -------------------------------------
             // Unity defined keywords

ScriptableRenderPipeline/LightweightPipeline/LWRP/Shaders/Terrain/LightweightStandardTerrainBase.shader

             #pragma multi_compile _ _MIXED_LIGHTING_SUBTRACTIVE
             #pragma multi_compile _ _SHADOWS_ENABLED
             #pragma multi_compile _ _LOCAL_SHADOWS_ENABLED
+            #pragma multi_compile _ _SHADOWS_SOFT
 
             // -------------------------------------
             // Unity defined keywords

ScriptableRenderPipeline/LightweightPipeline/LWRP/Shaders/Terrain/LightweightWavingGrass.shader

             #pragma multi_compile _ _MIXED_LIGHTING_SUBTRACTIVE
             #pragma multi_compile _ _SHADOWS_ENABLED
             #pragma multi_compile _ _LOCAL_SHADOWS_ENABLED
+            #pragma multi_compile _ _SHADOWS_SOFT
 
             // -------------------------------------
             // Unity defined keywords

ScriptableRenderPipeline/LightweightPipeline/LWRP/Shaders/Terrain/LightweightWavingGrassBillboard.shader

             #pragma multi_compile _ _MIXED_LIGHTING_SUBTRACTIVE
             #pragma multi_compile _ _SHADOWS_ENABLED
             #pragma multi_compile _ _LOCAL_SHADOWS_ENABLED
+            #pragma multi_compile _ _SHADOWS_SOFT
 
             // -------------------------------------
             // Unity defined keywords