metaverse_artist/Lux URP Essentials/Shaders/Transmission/Lux URP Transmission.shader

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

Shader "Lux URP/Transmission"
{
    Properties
    {
        [HeaderHelpLuxURP_URL(6rnfwcochmqs)]

        [Header(Surface Options)]
        [Space(8)]
        [Enum(UnityEngine.Rendering.CullMode)]
        _Cull                       ("Culling", Float) = 2
        [Toggle(_ALPHATEST_ON)]
        _AlphaClip                  ("Alpha Clipping", Float) = 0.0
        _Cutoff                     ("     Threshold", Range(0.0, 1.0)) = 0.5
        [ToggleOff(_RECEIVE_SHADOWS_OFF)]
        _ReceiveShadows             ("Receive Shadows", Float) = 1.0
        _ShadowOffset               ("Shadow Offset", Float) = 1.0


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

        [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 Map", Float) = 0.0
        [NoScaleOffset] _BumpMap    ("     Normal Map", 2D) = "bump" {}
        _BumpScale                  ("     Normal Scale", Float) = 1.0


        [Space(5)]
        [Toggle(_MASKMAP)]
        _EnableMaskMap              ("Enable Mask Map", Float) = 0.0
        _MaskMap                    ("     Mask (R) Thickness (G) Occlusion (B) Smoothness (A)", 2D) = "white" {}
        _Occlusion                  ("     Occlusion", Range(0.0, 1.0)) = 1


        [Header(Transmission)]
        [Space(8)]
        _TranslucencyPower          ("Power", Range(0.0, 32.0)) = 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

        [Space(5)]
        _CustomWrap                 ("Wrapped Lighting", Range(0.0, 1.0)) = 0.4


        [Header(Rim Lighting)]
        [Space(8)]
        [Toggle(_RIMLIGHTING)]
        _Rim                        ("Enable Rim Lighting", Float) = 0
        [HDR] _RimColor             ("Rim Color", Color) = (0.5,0.5,0.5,1)
        _RimPower                   ("Rim Power", Float) = 2
        _RimFrequency               ("Rim Frequency", Float) = 0
        _RimMinPower                ("     Rim Min Power", Float) = 1
        _RimPerPositionFrequency    ("     Rim Per Position Frequency", Range(0.0, 1.0)) = 1


        [Header(Stencil)]
        [Space(8)]
        [IntRange] _Stencil         ("Stencil Reference", Range (0, 255)) = 0
        [IntRange] _ReadMask        ("     Read Mask", Range (0, 255)) = 255
        [IntRange] _WriteMask       ("     Write Mask", Range (0, 255)) = 255
        [Enum(UnityEngine.Rendering.CompareFunction)]
        _StencilComp                ("Stencil Comparison", Int) = 8     // always
        [Enum(UnityEngine.Rendering.StencilOp)]
        _StencilOp                  ("Stencil Operation", Int) = 0      // 0 = keep, 2 = replace
        [Enum(UnityEngine.Rendering.StencilOp)]
        _StencilFail                ("Stencil Fail Op", Int) = 0        // 0 = keep
        [Enum(UnityEngine.Rendering.StencilOp)] 
        _StencilZFail               ("Stencil ZFail Op", Int) = 0       // 0 = keep


        [Header(Advanced)]
        [Space(8)]
        [ToggleOff]
        _SpecularHighlights         ("Enable Specular Highlights", Float) = 1.0
        [ToggleOff]
        _EnvironmentReflections     ("Environment Reflections", Float) = 1.0
        [Space(5)]


        [Header(Render Queue)]
        [Space(8)]
        [IntRange] _QueueOffset     ("Queue Offset", Range(-50, 50)) = 0
        
    //  Lightmapper and outline selection shader need _MainTex, _Color and _Cutoff
        [HideInInspector] _MainTex  ("Albedo", 2D) = "white" {}
        [HideInInspector] _Color    ("Color", Color) = (1,1,1,1)


    //  As URP 10.1 complains about it?!: 
        // [HideInInspector] _ClearCoatMask ("Dummy", Float) = 2
        // [HideInInspector] _ClearCoatSmoothness ("Dummy", Float) = 1
        // [HideInInspector] _DetailAlbedoMapScale ("Dummy", Float) = 1
        // [HideInInspector] _DetailNormalMapScale ("Dummy", Float) = 1
        // [HideInInspector] _Metallic ("Dummy", Float) = 1
        // [HideInInspector] _OcclusionStrength ("Dummy", Float) = 1
        // [HideInInspector] _Parallax ("Dummy", Float) = 1
        // [HideInInspector] _Surface ("Dummy", Float) = 1
        // [HideInInspector] _DetailAlbedoMap_ST ("Dummy", Vector) = (1, 1, 0, 0)
        // [HideInInspector] _EmissionColor ("Color", Color) = (1,1,1,1)

    }

    SubShader
    {
        Tags
        {
            "RenderPipeline" = "UniversalPipeline"
            "RenderType" = "Opaque"
            "Queue" = "Geometry"
        }
        LOD 100

        Pass
        {
            Name "ForwardLit"
            Tags{"LightMode" = "UniversalForward"}

            Stencil {
                Ref   [_Stencil]
                ReadMask [_ReadMask]
                WriteMask [_WriteMask]
                Comp  [_StencilComp]
                Pass  [_StencilOp]
                Fail  [_StencilFail]
                ZFail [_StencilZFail]
            }
            
            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 

            // -------------------------------------
            // Material Keywords
            #define _SPECULAR_SETUP 1

            #pragma shader_feature_local _NORMALMAP
            #pragma shader_feature_local_fragment _ALPHATEST_ON

            #pragma shader_feature_local _MASKMAP                   // Not per fragment!
            #define _CUSTOMWRAP
            #define _STANDARDLIGHTING

            #pragma shader_feature_local_fragment _RIMLIGHTING

            #pragma shader_feature_local_fragment _SPECULARHIGHLIGHTS_OFF
            #pragma shader_feature_local_fragment _ENVIRONMENTREFLECTIONS_OFF
            #pragma shader_feature_local _RECEIVE_SHADOWS_OFF


            // -------------------------------------
            // 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 Transmission 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);

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

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

                output.uv.xy = TRANSFORM_TEX(input.texcoord, _BumpMap);
                
                #if defined(_MASKMAP)
                    output.uv.zw = TRANSFORM_TEX(input.texcoord, _MaskMap);
                #endif

                output.normalWS = normalInput.normalWS;
                output.viewDirWS = viewDirWS;

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

                OUTPUT_LIGHTMAP_UV(input.lightmapUV, unity_LightmapST, output.lightmapUV);
                OUTPUT_SH(output.normalWS.xyz, output.vertexSH);
                
                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 InitializeSurfaceData(
                #if defined(_MASKMAP)
                    float4 uv,
                #else
                    float2 uv,
                #endif
                out SurfaceDescription outSurfaceData)
            {

                half4 albedoAlpha = SampleAlbedoAlpha(uv.xy, TEXTURE2D_ARGS(_BaseMap, sampler_BaseMap));
                outSurfaceData.alpha = Alpha(albedoAlpha.a, _BaseColor, _Cutoff);

                outSurfaceData.albedo = albedoAlpha.rgb * _BaseColor.rgb;
            //  Normal Map
                #if defined (_NORMALMAP)
                    outSurfaceData.normalTS = SampleNormal(uv, TEXTURE2D_ARGS(_BumpMap, sampler_BumpMap), _BumpScale);
                #else
                    outSurfaceData.normalTS = half3(0,0,1);
                #endif
                outSurfaceData.emission = 0;

                outSurfaceData.metallic = 0;
                outSurfaceData.specular = _SpecColor.rgb;
                outSurfaceData.smoothness = _Smoothness;
                outSurfaceData.occlusion = 1;

                outSurfaceData.translucency = _TranslucencyStrength;
                outSurfaceData.mask = 1;

            //  Transmission
                #if defined(_MASKMAP)
                    half4 maskSample = SAMPLE_TEXTURE2D(_MaskMap, sampler_MaskMap, uv.zw);
                    outSurfaceData.translucency *= maskSample.g;
                    outSurfaceData.occlusion = lerp(1.0h, maskSample.b, _Occlusion);
                    outSurfaceData.mask = maskSample.r;
                    outSurfaceData.smoothness *= maskSample.a;
                #endif
            }

            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);
                #if defined(_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.xyz, input.normalWS.xyz));
                #else
                    inputData.normalWS = input.normalWS * facing;
                #endif

                inputData.normalWS = NormalizeNormalPerPixel(inputData.normalWS);
                viewDirWS = SafeNormalize(viewDirWS);
                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;
                inputData.bakedGI = SAMPLE_GI(input.lightmapUV, input.vertexSH, inputData.normalWS);

                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;
                InitializeSurfaceData(input.uv, surfaceData);

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

                #if defined(_RIMLIGHTING)
                    half rim = saturate(1.0h - saturate( dot(inputData.normalWS, inputData.viewDirectionWS) ) );
                    half power = _RimPower;
                    UNITY_BRANCH if(_RimFrequency > 0 ) {
                        half perPosition = lerp(0.0h, 1.0h, dot(1.0h, frac(UNITY_MATRIX_M._m03_m13_m23) * 2.0h - 1.0h ) * _RimPerPositionFrequency ) * 3.1416h;
                        power = lerp(power, _RimMinPower, (1.0h + sin(_Time.y * _RimFrequency + perPosition) ) * 0.5h );
                    }
                    surfaceData.emission += pow(rim, power) * _RimColor.rgb * _RimColor.a;
                #endif

            //  Apply lighting
                half4 color = LuxURPTranslucentFragmentPBR (
                        inputData, 
                        
                        surfaceData.albedo,
                        surfaceData.metallic, 
                        surfaceData.specular, 
                        surfaceData.smoothness, 
                        surfaceData.occlusion, 
                        surfaceData.emission, 
                        surfaceData.alpha,

                        half4(surfaceData.translucency, _TranslucencyPower, _ShadowStrength, _Distortion),
                        1 //_AmbientReflection
                        #if defined(_CUSTOMWRAP)
                            , _CustomWrap
                        #endif
                        #if defined(_STANDARDLIGHTING)
                            , surfaceData.mask
                        #endif
                        , _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

            //--------------------------------------
            // 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 Transmission Inputs.hlsl"
            #include "Packages/com.unity.render-pipelines.universal/ShaderLibrary/Shadows.hlsl"
            
        //  Shadow caster specific input
            float3 _LightDirection;

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

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

                #if defined(_ALPHATEST_ON)
                    output.uv.xy = TRANSFORM_TEX(input.texcoord, _BaseMap);
                #endif

                output.positionCS = TransformWorldToHClip(ApplyShadowBias(positionWS, normalWS * _ShadowOffset, _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
            {
                UNITY_SETUP_INSTANCE_ID(input);
                UNITY_SETUP_STEREO_EYE_INDEX_POST_VERTEX(input);

                #if defined(_ALPHATEST_ON)
                    half mask = SAMPLE_TEXTURE2D(_BaseMap, sampler_BaseMap, input.uv).a;
                    clip (mask * _BaseColor.a - _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

            //--------------------------------------
            // GPU Instancing
            #pragma multi_compile_instancing
            // #pragma multi_compile _ DOTS_INSTANCING_ON // needs shader target 4.5
            
            #define DEPTHONLYPASS
            #include "Includes/Lux URP Transmission 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);

                #if defined(_ALPHATEST_ON)
                    output.uv.xy = TRANSFORM_TEX(input.texcoord, _BaseMap);
                #endif

                output.positionCS = TransformObjectToHClip(input.positionOS.xyz);
                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 mask = SAMPLE_TEXTURE2D(_BaseMap, sampler_BaseMap, input.uv).a;
                    clip (mask * _BaseColor.a - _Cutoff);
                #endif

                return 0;
            }

            ENDHLSL
        }

    //  Depth Normal ---------------------------------------------
        // This pass is used when drawing to a _CameraNormalsTexture texture
        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 _NORMALMAP
            #pragma shader_feature_local _ALPHATEST_ON
            #pragma shader_feature_local_fragment _SMOOTHNESS_TEXTURE_ALBEDO_CHANNEL_A

            //--------------------------------------
            // GPU Instancing
            #pragma multi_compile_instancing
            // #pragma multi_compile _ DOTS_INSTANCING_ON // needs shader target 4.5
            // #include "Packages/com.unity.render-pipelines.universal/Shaders/LitInput.hlsl"
            #include "Includes/Lux URP Transmission Inputs.hlsl"
            #include "Packages/com.unity.render-pipelines.universal/Shaders/DepthNormalsPass.hlsl"
            ENDHLSL
        }

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

            Cull Off

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

            #pragma vertex UniversalVertexMeta
            #pragma fragment UniversalFragmentMeta

            #define _SPECULAR_SETUP 1
            #pragma shader_feature_local_fragment _ALPHATEST_ON

        //  First include all our custom stuff
            #include "Includes/Lux URP Transmission 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 = 1;
                outSurfaceData.albedo = _BaseColor.rgb;
                outSurfaceData.metallic = 0;
                outSurfaceData.specular = _SpecColor.rgb;
                outSurfaceData.smoothness = _Smoothness;
                outSurfaceData.normalTS = half3(0,0,1);
                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 "LuxURPUniversalCustomShaderGUI"
}