// Shader uses custom editor to set double sided GI
// Needs _Culling to be set properly

Shader "Lux URP/Vegetation/Foliage"
{
    Properties
    {
        [HeaderHelpLuxURP_URL(iwibq8un2c3h)]
        
        [Header(Surface Options)]
        [Space(8)]
        [Enum(UnityEngine.Rendering.CullMode)]
        _Cull                       ("Culling", Float) = 0
        [Toggle(_ALPHATEST_ON)]
        _AlphaClip                  ("Alpha Clipping", Float) = 1.0
        _Cutoff                     ("     Threshold", Range(0.0, 1.0)) = 0.5
        [Enum(Off,0,On,1)]_Coverage ("Alpha To Coverage", Float) = 0
        [ToggleOff(_RECEIVE_SHADOWS_OFF)]
        _ReceiveShadows             ("Receive Shadows", Float) = 1.0

        [Header(Surface Inputs)]
        [Space(8)]
        [NoScaleOffset][MainTexture]
        _BaseMap                    ("Albedo (RGB) Alpha (A)", 2D) = "white" {}
        [HideInInspector][MainColor]
        _BaseColor                  ("Color", Color) = (1,1,1,1)

        [Space(5)]
        _Smoothness                 ("Smoothness", Range(0.0, 1.0)) = 0.5
        _SpecColor                  ("Specular", Color) = (0.2, 0.2, 0.2)

        [Space(5)]
        [Toggle(_NORMALMAP)]
        _ApplyNormal                ("Enable Normal Smoothness Trans Map", Float) = 0.0
        [NoScaleOffset] _BumpSpecMap
                                    ("     Normal (AG) Smoothness (B) Trans (R)", 2D) = "white" {}
        _BumpScale                  ("     Normal Scale", Range(0.0, 8.0)) = 1.0
        _GlossMapScale              ("     Smoothness Scale", Range(0.0, 1.0)) = 1.0

        [Header(Transmission)]
        [Space(8)]
        _TranslucencyPower          ("Power", Range(0.0, 10.0)) = 7.0
        _TranslucencyStrength       ("Strength", Range(0.0, 1.0)) = 1.0
        _ShadowStrength             ("Shadow Strength", Range(0.0, 1.0)) = 0.7
        _MaskByShadowStrength       ("Mask by incoming Shadow Strength", Range(0.0, 1.0)) = 0.0
        _Distortion                 ("Distortion", Range(0.0, 0.1)) = 0.01

        [Header(Wind)]
        [Space(8)]
        [KeywordEnum(Texture, Math)]
        _Wind                       ("Wind Input", Float) = 0
        [LuxURPWindFoliageDrawer]
        _WindMultiplier             ("Wind Strength (X) Secondary Strength (Y) Edge Flutter (Z) Lod Level (W)", Vector) = (1, 2, 1, 0)
        _SampleSize                 ("Sample Size", Range(0.0, 1.0)) = 0.5

        [Header(Distance Fading)]
        [Space(8)]
        [LuxURPDistanceFadeDrawer]
        _DistanceFade               ("Distance Fade Params", Vector) = (2500, 0.001, 0, 0)

        [Header(Advanced)]
        [Space(8)]
        [ToggleOff]
        _SpecularHighlights         ("Enable Specular Highlights", Float) = 1.0
        [ToggleOff]
        _EnvironmentReflections     ("Environment Reflections", Float) = 1.0

    //  Lightmapper and outline selection shader need _MainTex, _Color and _Cutoff
        [HideInInspector] _MainTex  ("Albedo", 2D) = "white" {}
        [HideInInspector] _Color    ("Color", Color) = (1,1,1,1)
    }

    SubShader
    {
        Tags
        {
            "RenderPipeline" = "UniversalPipeline"
            "RenderType" = "Opaque"                     // "RenderType" = "TransparentCutout" // Gets adjusted by inspector
            "IgnoreProjector" = "True"
            "Queue"="Geometry"                          // "Queue"="AlphaTest" // Gets adjusted by inspector
            "ShaderModel"="4.5"
        }
        LOD 300

        Pass
        {
            Name "ForwardLit"
            Tags{"LightMode" = "UniversalForward"}
            ZWrite On
            Cull[_Cull]
            AlphaToMask [_Coverage]

            HLSLPROGRAM
             // Required to compile gles 2.0 with standard srp library
            #pragma prefer_hlslcc gles
            #pragma exclude_renderers d3d11_9x
            #pragma target 2.0

            // -------------------------------------
            // Material Keywords
            #define _SPECULAR_SETUP 1
            
            #pragma shader_feature_local _NORMALMAP
            #pragma shader_feature_local_fragment _ALPHATEST_ON
            
            #pragma shader_feature_local_fragment _SPECULARHIGHLIGHTS_OFF
            #pragma shader_feature_local_fragment _ENVIRONMENTREFLECTIONS_OFF
            #pragma shader_feature_local _RECEIVE_SHADOWS_OFF

            #pragma shader_feature_local _WIND_MATH

            // -------------------------------------
            // Universal Pipeline keywords
            #pragma multi_compile _ _MAIN_LIGHT_SHADOWS
            #pragma multi_compile _ _MAIN_LIGHT_SHADOWS_CASCADE
            #pragma multi_compile _ _ADDITIONAL_LIGHTS_VERTEX _ADDITIONAL_LIGHTS
            #pragma multi_compile_fragment _ _ADDITIONAL_LIGHT_SHADOWS
            #pragma multi_compile_fragment _ _SHADOWS_SOFT
            #pragma multi_compile_fragment _ _SCREEN_SPACE_OCCLUSION
            #pragma multi_compile _ LIGHTMAP_SHADOW_MIXING
            #pragma multi_compile _ SHADOWS_SHADOWMASK

            // -------------------------------------
            // Unity defined keywords
            #pragma multi_compile _ DIRLIGHTMAP_COMBINED
            #pragma multi_compile _ LIGHTMAP_ON
            #pragma multi_compile_fog

            //--------------------------------------
            // GPU Instancing
            #pragma multi_compile_instancing
            // #pragma multi_compile _ DOTS_INSTANCING_ON // needs shader target 4.5

        //  Include base inputs and all other needed "base" includes
            #include "Includes/Lux URP Foliage Inputs.hlsl"

            #pragma vertex LitPassVertex
            #pragma fragment LitPassFragment

        //--------------------------------------
        //  Vertex shader


            VertexOutput LitPassVertex(VertexInput input)
            {
                VertexOutput output = (VertexOutput)0;
                UNITY_SETUP_INSTANCE_ID(input);
                UNITY_TRANSFER_INSTANCE_ID(input, output);
                UNITY_INITIALIZE_VERTEX_OUTPUT_STEREO(output);

            //  Set distance fade value
                float3 worldInstancePos = UNITY_MATRIX_M._m03_m13_m23;
                float3 diff = (_WorldSpaceCameraPos - worldInstancePos);
                float dist = dot(diff, diff);
                output.fade = saturate( (_DistanceFade.x - dist) * _DistanceFade.y );

            //  Shrink mesh if alpha testing is disabled
                #if !defined(_ALPHATEST_ON)
                    input.positionOS.xyz *= output.fade;
                #endif

            //  Wind in ObjectSpace -------------------------------
                animateVertex(input.color, input.normalOS.xyz, input.positionOS.xyz);
            //  End Wind -------------------------------

                VertexPositionInputs vertexInput; // = GetVertexPositionInputs(input.positionOS.xyz);
                vertexInput.positionWS = TransformObjectToWorld(input.positionOS.xyz);
                VertexNormalInputs normalInput = GetVertexNormalInputs(input.normalOS, input.tangentOS);

            //  We have to recalculate ClipPos! / see: GetVertexPositionInputs in Core.hlsl
                vertexInput.positionVS = TransformWorldToView(vertexInput.positionWS);
                vertexInput.positionCS = TransformWorldToHClip(vertexInput.positionWS);
                float4 ndc = vertexInput.positionCS * 0.5f;
                vertexInput.positionNDC.xy = float2(ndc.x, ndc.y * _ProjectionParams.x) + ndc.w;
                vertexInput.positionNDC.zw = vertexInput.positionCS.zw;

                float3 viewDirWS = GetCameraPositionWS() - vertexInput.positionWS;
                half3 vertexLight = VertexLighting(vertexInput.positionWS, normalInput.normalWS);
                half fogFactor = ComputeFogFactor(vertexInput.positionCS.z);

                output.uv.xy = input.texcoord;
                // already normalized from normal transform to WS
                output.normalWS = normalInput.normalWS;
                output.viewDirWS = viewDirWS;

                #ifdef _NORMALMAP
                    float sign = input.tangentOS.w * GetOddNegativeScale();
                    output.tangentWS = float4(normalInput.tangentWS, sign);
                #endif

                OUTPUT_LIGHTMAP_UV(input.lightmapUV, unity_LightmapST, output.lightmapUV);
                
                #if defined(_NORMALMAP)
                    OUTPUT_SH(output.normalWS.xyz, output.vertexSH);
                #else
            //  TODO: When no normal map is applied we have to lookup SH fully per pixel
                    #if !defined(LIGHTMAP_ON)
                        output.vertexSH = 0;
                    #endif
                #endif
                
                output.fogFactorAndVertexLight = half4(fogFactor, vertexLight);

                #if defined(REQUIRES_WORLD_SPACE_POS_INTERPOLATOR)
                    output.positionWS = vertexInput.positionWS;
                #endif

                #if defined(REQUIRES_VERTEX_SHADOW_COORD_INTERPOLATOR)
                    output.shadowCoord = GetShadowCoord(vertexInput);
                #endif

                output.positionCS = vertexInput.positionCS;

                return output;
            }

        //--------------------------------------
        //  Fragment shader and functions

            inline void InitializeFoliageLitSurfaceData(float2 uv, half fade, out SurfaceDescription outSurfaceData)
            {
                half4 albedoAlpha = SampleAlbedoAlpha(uv, TEXTURE2D_ARGS(_BaseMap, sampler_BaseMap));
            //  Add fade
                albedoAlpha.a *= fade;
            //  Early out
                outSurfaceData.alpha = Alpha(albedoAlpha.a, 1, _Cutoff);
                
                outSurfaceData.albedo = albedoAlpha.rgb;
                outSurfaceData.metallic = 0;
                outSurfaceData.specular = _SpecColor.rgb;
            
            //  Normal Map
                #if defined (_NORMALMAP)
                    float4 sampleNormal = SAMPLE_TEXTURE2D(_BumpSpecMap, sampler_BumpSpecMap, uv);
                    float3 tangentNormal;
                    tangentNormal.xy = sampleNormal.ag * 2 - 1;
                    tangentNormal.z = sqrt(1.0 - dot(tangentNormal.xy, tangentNormal.xy));

                    // From Packing.hlsl:
                    // must scale after reconstruction of normal.z which also
                    // mirrors UnpackNormalRGB(). This does imply normal is not returned
                    // as a unit length vector but doesn't need it since it will get normalized after TBN transformation.
                    tangentNormal.xy *= _BumpScale;

                    outSurfaceData.normalTS = tangentNormal;
                    outSurfaceData.smoothness = sampleNormal.b * _GlossMapScale;
                    outSurfaceData.translucency = sampleNormal.r;
                #else
                    outSurfaceData.normalTS = float3(0, 0, 1);
                    outSurfaceData.smoothness = _Smoothness;
                    outSurfaceData.translucency = 1;
                #endif
                outSurfaceData.occlusion = 1;
                outSurfaceData.emission = 0;
            }

            void InitializeInputData(VertexOutput input, half3 normalTS, half facing, out InputData inputData)
            {
                inputData = (InputData)0;
                #if defined(REQUIRES_WORLD_SPACE_POS_INTERPOLATOR)
                    inputData.positionWS = input.positionWS;
                #endif
                half3 viewDirWS = SafeNormalize(input.viewDirWS);
                #ifdef _NORMALMAP
                    normalTS.z *= facing;
                    float sgn = input.tangentWS.w;      // should be either +1 or -1
                    float3 bitangent = sgn * cross(input.normalWS.xyz, input.tangentWS.xyz);
                    inputData.normalWS = TransformTangentToWorld(normalTS, half3x3(input.tangentWS.xyz, bitangent, input.normalWS.xyz));
                #else
                    inputData.normalWS = input.normalWS * facing;
                #endif

                inputData.normalWS = NormalizeNormalPerPixel(inputData.normalWS);
                inputData.viewDirectionWS = viewDirWS;
                
                #if defined(REQUIRES_VERTEX_SHADOW_COORD_INTERPOLATOR)
                    inputData.shadowCoord = input.shadowCoord;
                #elif defined(MAIN_LIGHT_CALCULATE_SHADOWS)
                    inputData.shadowCoord = TransformWorldToShadowCoord(inputData.positionWS);
                #else
                    inputData.shadowCoord = float4(0, 0, 0, 0);
                #endif

                inputData.fogCoord = input.fogFactorAndVertexLight.x;
                inputData.vertexLighting = input.fogFactorAndVertexLight.yzw;
                
            //  
                #if defined(_NORMALMAP) 
                    inputData.bakedGI = SAMPLE_GI(input.lightmapUV, input.vertexSH, inputData.normalWS);
                #endif

            //  TODO: Using VFACE and vertex normals – so we should sample SH fully per pixel
                #if !defined(_NORMALMAP) && !defined(LIGHTMAP_ON)
                    inputData.bakedGI = SampleSH(inputData.normalWS);
                #endif

                inputData.normalizedScreenSpaceUV = GetNormalizedScreenSpaceUV(input.positionCS);
                inputData.shadowMask = SAMPLE_SHADOWMASK(input.lightmapUV);
            }

            half4 LitPassFragment(VertexOutput input, half facing : VFACE) : SV_Target
            {
                UNITY_SETUP_INSTANCE_ID(input);
                UNITY_SETUP_STEREO_EYE_INDEX_POST_VERTEX(input);

            //  Get the surface description
                SurfaceDescription surfaceData;
                InitializeFoliageLitSurfaceData(input.uv.xy, input.fade, surfaceData);

            //  Prepare surface data (like bring normal into world space (incl. VFACE)) and get missing inputs like gi
                InputData inputData;
                InitializeInputData(input, surfaceData.normalTS, facing, inputData);

            //  Apply lighting
                half4 color = LuxURPTranslucentFragmentPBR(
                    inputData, 
                    surfaceData.albedo, 
                    surfaceData.metallic, 
                    surfaceData.specular, 
                    surfaceData.smoothness, 
                    surfaceData.occlusion, 
                    surfaceData.emission, 
                    surfaceData.alpha,
                    half4(_TranslucencyStrength * surfaceData.translucency, _TranslucencyPower, _ShadowStrength, _Distortion),
                    1, //_AmbientReflection
                    _MaskByShadowStrength
                );

            //  Add fog
                color.rgb = MixFog(color.rgb, inputData.fogCoord);
                return color;
            }

            ENDHLSL
        }


    //  Shadows -----------------------------------------------------
        
        Pass
        {
            Name "ShadowCaster"
            Tags{"LightMode" = "ShadowCaster"}

            ZWrite On
            ZTest LEqual
            ColorMask 0
            Cull[_Cull]

            HLSLPROGRAM
             // Required to compile gles 2.0 with standard srp library
            #pragma prefer_hlslcc gles
            #pragma exclude_renderers d3d11_9x
            #pragma target 2.0

            // -------------------------------------
            // Material Keywords
            #pragma shader_feature_local_fragment _ALPHATEST_ON

            #pragma shader_feature_local _WIND_MATH


            //--------------------------------------
            // GPU Instancing
            #pragma multi_compile_instancing
            // #pragma multi_compile _ DOTS_INSTANCING_ON // needs shader target 4.5

            #pragma vertex ShadowPassVertex
            #pragma fragment ShadowPassFragment

        //  Include base inputs and all other needed "base" includes
            #include "Includes/Lux URP Foliage Inputs.hlsl"
            #include "Packages/com.unity.render-pipelines.universal/ShaderLibrary/Shadows.hlsl"
            
        //  Shadow caster specific input
            float3 _LightDirection;

            VertexOutput ShadowPassVertex(VertexInput input)
            {
                VertexOutput output;
                UNITY_SETUP_INSTANCE_ID(input);
                UNITY_TRANSFER_INSTANCE_ID(input, output);

            //  Set distance fade value
                float3 worldInstancePos = UNITY_MATRIX_M._m03_m13_m23;
                float3 diff = (_WorldSpaceCameraPos - worldInstancePos);
                float dist = dot(diff, diff);
                output.fade = saturate( (_DistanceFade.x - dist) * _DistanceFade.y );

            //  Shrink mesh if alpha testing is disabled
                #if !defined(_ALPHATEST_ON)
                    input.positionOS.xyz *= output.fade;
                #endif
                
                output.uv = input.texcoord;

            //  Wind in Object Space -------------------------------
                animateVertex(input.color, input.normalOS.xyz, input.positionOS.xyz);
            //  End Wind -------------------------------

                float3 positionWS = TransformObjectToWorld(input.positionOS.xyz);
                float3 normalWS = TransformObjectToWorldDir(input.normalOS);

                output.positionCS = TransformWorldToHClip(ApplyShadowBias(positionWS, normalWS, _LightDirection));
                #if UNITY_REVERSED_Z
                    output.positionCS.z = min(output.positionCS.z, output.positionCS.w * UNITY_NEAR_CLIP_VALUE);
                #else
                    output.positionCS.z = max(output.positionCS.z, output.positionCS.w * UNITY_NEAR_CLIP_VALUE);
                #endif
                return output;
            }

            half4 ShadowPassFragment(VertexOutput input) : SV_TARGET
            {
                #if defined(_ALPHATEST_ON)
                    half alpha = SampleAlbedoAlpha(input.uv, TEXTURE2D_ARGS(_BaseMap, sampler_BaseMap)).a;
                //  Works in scene view but not in GameView?
                    alpha *= input.fade;
                    clip(alpha - _Cutoff);
                #endif
                return 0;
            }
            ENDHLSL
        }

    //  Depth -----------------------------------------------------

        Pass
        {
            Tags{"LightMode" = "DepthOnly"}

            ZWrite On
            ColorMask 0
            Cull[_Cull]

            HLSLPROGRAM
             // Required to compile gles 2.0 with standard srp library
            #pragma prefer_hlslcc gles
            #pragma exclude_renderers d3d11_9x
            #pragma target 2.0

            #pragma vertex DepthOnlyVertex
            #pragma fragment DepthOnlyFragment

            // -------------------------------------
            // Material Keywords
            #pragma shader_feature_local_fragment _ALPHATEST_ON

            #pragma shader_feature_local _WIND_MATH

            //--------------------------------------
            // GPU Instancing
            #pragma multi_compile_instancing
            // #pragma multi_compile _ DOTS_INSTANCING_ON // needs shader target 4.5
            
            #define DEPTHONLYPASS
            #include "Includes/Lux URP Foliage Inputs.hlsl"

            VertexOutput DepthOnlyVertex(VertexInput input)
            {
                VertexOutput output = (VertexOutput)0;
                UNITY_SETUP_INSTANCE_ID(input);
                UNITY_TRANSFER_INSTANCE_ID(input, output);
                UNITY_INITIALIZE_VERTEX_OUTPUT_STEREO(output);

            //  Set distance fade value
                float3 worldInstancePos = UNITY_MATRIX_M._m03_m13_m23;
                float3 diff = (_WorldSpaceCameraPos - worldInstancePos);
                float dist = dot(diff, diff);
                output.fade = saturate( (_DistanceFade.x - dist) * _DistanceFade.y );

            //  Shrink mesh if alpha testing is disabled
                #if !defined(_ALPHATEST_ON)
                    input.positionOS.xyz *= output.fade;
                #endif

            //  Wind in Object Space -------------------------------
                animateVertex(input.color, input.normalOS.xyz, input.positionOS.xyz);
            //  End Wind -------------------------------

                VertexPositionInputs vertexInput;
                vertexInput.positionWS = TransformObjectToWorld(input.positionOS.xyz);

            //  We have to recalculate ClipPos! / see: GetVertexPositionInputs in Core.hlsl
                vertexInput.positionVS = TransformWorldToView(vertexInput.positionWS);
                vertexInput.positionCS = TransformWorldToHClip(vertexInput.positionWS);
                float4 ndc = vertexInput.positionCS * 0.5f;
                vertexInput.positionNDC.xy = float2(ndc.x, ndc.y * _ProjectionParams.x) + ndc.w;
                vertexInput.positionNDC.zw = vertexInput.positionCS.zw;
            //  End Wind -------------------------------                

                output.uv.xy = input.texcoord;
                output.positionCS = vertexInput.positionCS;
                return output;
            }

            half4 DepthOnlyFragment(VertexOutput input) : SV_TARGET
            {
                UNITY_SETUP_INSTANCE_ID(input);
                UNITY_SETUP_STEREO_EYE_INDEX_POST_VERTEX(input);
                #if defined(_ALPHATEST_ON)
                    half alpha = SampleAlbedoAlpha(input.uv.xy, TEXTURE2D_ARGS(_BaseMap, sampler_BaseMap)).a;
                    alpha *= input.fade;
                    clip(alpha - _Cutoff);
                #endif
                return 0;
            }

            ENDHLSL
        }

        //  Depth Normal -----------------------------------------------------

        Pass
        {
            Name "DepthNormals"
            Tags{"LightMode" = "DepthNormals"}

            ZWrite On
            Cull[_Cull]

            HLSLPROGRAM
             // Required to compile gles 2.0 with standard srp library
            #pragma prefer_hlslcc gles
            #pragma exclude_renderers d3d11_9x
            #pragma target 2.0

            #pragma vertex DepthNormalsVertex
            #pragma fragment DepthNormalsFragment

            // -------------------------------------
            // Material Keywords
            #pragma shader_feature_local_fragment _ALPHATEST_ON

            #pragma shader_feature_local _WIND_MATH

            //--------------------------------------
            // GPU Instancing
            #pragma multi_compile_instancing
            // #pragma multi_compile _ DOTS_INSTANCING_ON // needs shader target 4.5
            
            #define DEPTNORMALPASS
            #include "Includes/Lux URP Foliage Inputs.hlsl"

            VertexOutput DepthNormalsVertex(VertexInput input)
            {
                VertexOutput output = (VertexOutput)0;
                UNITY_SETUP_INSTANCE_ID(input);
                UNITY_TRANSFER_INSTANCE_ID(input, output);
                UNITY_INITIALIZE_VERTEX_OUTPUT_STEREO(output);

            //  Set distance fade value
                float3 worldInstancePos = UNITY_MATRIX_M._m03_m13_m23;
                float3 diff = (_WorldSpaceCameraPos - worldInstancePos);
                float dist = dot(diff, diff);
                output.fade = saturate( (_DistanceFade.x - dist) * _DistanceFade.y );

            //  Shrink mesh if alpha testing is disabled
                #if !defined(_ALPHATEST_ON)
                    input.positionOS.xyz *= output.fade;
                #endif

            //  Wind in Object Space -------------------------------
                animateVertex(input.color, input.normalOS.xyz, input.positionOS.xyz);
            //  End Wind -------------------------------

                VertexPositionInputs vertexInput;
                vertexInput.positionWS = TransformObjectToWorld(input.positionOS.xyz);

                VertexNormalInputs normalInput = GetVertexNormalInputs(input.normalOS, float4(1,1,1,1)); //input.tangentOS);

            //  We have to recalculate ClipPos! / see: GetVertexPositionInputs in Core.hlsl
                vertexInput.positionVS = TransformWorldToView(vertexInput.positionWS);
                vertexInput.positionCS = TransformWorldToHClip(vertexInput.positionWS);
                float4 ndc = vertexInput.positionCS * 0.5f;
                vertexInput.positionNDC.xy = float2(ndc.x, ndc.y * _ProjectionParams.x) + ndc.w;
                vertexInput.positionNDC.zw = vertexInput.positionCS.zw;
            //  End Wind -------------------------------                

                output.uv.xy = input.texcoord;
                output.positionCS = vertexInput.positionCS;
                output.normalWS = normalInput.normalWS;
                return output;
            }

            half4 DepthNormalsFragment(VertexOutput input) : SV_TARGET
            {
                UNITY_SETUP_INSTANCE_ID(input);
                UNITY_SETUP_STEREO_EYE_INDEX_POST_VERTEX(input);
                #if defined(_ALPHATEST_ON)
                    half alpha = SampleAlbedoAlpha(input.uv.xy, TEXTURE2D_ARGS(_BaseMap, sampler_BaseMap)).a;
                    alpha *= input.fade;
                    clip(alpha - _Cutoff);
                #endif
                float3 normal = input.normalWS;
                normal = TransformWorldToViewDir(normal, true);
                normal.z = abs(normal.z);
                return float4(PackNormalOctRectEncode(normal), 0.0, 0.0);

            }

            ENDHLSL
        }

    //  Meta -----------------------------------------------------
        
        Pass
        {
            Tags{"LightMode" = "Meta"}

            Cull Off

            HLSLPROGRAM
            // Required to compile gles 2.0 with standard srp library
            #pragma prefer_hlslcc gles
            #pragma exclude_renderers d3d11_9x

            #pragma vertex UniversalVertexMeta
            #pragma fragment UniversalFragmentMeta

            #define _SPECULAR_SETUP
            #pragma shader_feature_local_fragment _ALPHATEST_ON

        //  First include all our custom stuff
            #include "Includes/Lux URP Foliage Inputs.hlsl"

        //--------------------------------------
        //  Fragment shader and functions

            inline void InitializeStandardLitSurfaceData(float2 uv, out SurfaceData outSurfaceData)
            {
                half4 albedoAlpha = SampleAlbedoAlpha(uv, TEXTURE2D_ARGS(_BaseMap, sampler_BaseMap));
                outSurfaceData.alpha = Alpha(albedoAlpha.a, 1, _Cutoff);
                outSurfaceData.albedo = albedoAlpha.rgb;
                outSurfaceData.metallic = 0;
                outSurfaceData.specular = _SpecColor.rgb;
                outSurfaceData.smoothness = _Smoothness;
                outSurfaceData.normalTS = half3(0,0,1); //SampleNormal(uv, TEXTURE2D_ARGS(_BumpMap, sampler_BumpMap));
                outSurfaceData.occlusion = 1;
                outSurfaceData.emission = 0;

                outSurfaceData.clearCoatMask = 0;
                outSurfaceData.clearCoatSmoothness = 0;
            }

        //  Finally include the meta pass related stuff  
            #include "Packages/com.unity.render-pipelines.universal/Shaders/LitMetaPass.hlsl"

            ENDHLSL
        }

    //  End Passes -----------------------------------------------------
    
    }
    FallBack "Hidden/InternalErrorShader"
    CustomEditor "LuxURPCustomSingleSidedShaderGUI"
}