metaverse_artist/Lux URP Essentials/Shaders/Versatile Blend/Lux URP Versatile Blend.shader

Shader "Lux URP/Versatile Blend"
{
    Properties
    {
        [HeaderHelpLuxURP_URL(bmrgpp8nhuvj)]
      
        [Header(Surface Blending)]
        [Space(8)]
        _Shift                      ("Depth Shift", Range(0.0, 0.03)) = 0.01
        _AlphaShift                 ("Alpha Shift", Range(0.0, 1)) = 0.1
        _AlphaWidth                 ("Alpha Contraction", Range(0.0, 20)) = 4
        [Space(5)]
        _ShadowShiftThreshold       ("Shadow Shift Threshold", Range(0, 0.1)) = 0.05
        _ShadowShift                ("Shadow Shift", Range(0, 1)) = 1
        _ShadowShiftView            ("Shadow Shift View", Range(0, 1)) = 0

        [Header(Surface Options)]
        [Space(8)]
        [Enum(UnityEngine.Rendering.CullMode)]
        _Cull                       ("Culling", Float) = 2
        [Enum(Off,0,On,1)]
        _ZWrite                     ("ZWrite", Int) = 1
    //  [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


        [Header(Surface Inputs)]
        [Space(8)]
        [MainColor]
        _BaseColor                  ("Color", Color) = (1,1,1,1)
        [MainTexture]
        _BaseMap                    ("Albedo (RGB) Smoothness (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


        [Header(Advanced)]
        [Space(8)]
        [ToggleOff]
        _SpecularHighlights         ("Enable Specular Highlights", Float) = 1.0
        [ToggleOff]
        _EnvironmentReflections     ("Environment Reflections", Float) = 1.0
        [Space(5)]
        [Toggle(_RECEIVE_SHADOWS_OFF)]
        _Shadows                    ("Disable Receive Shadows", Float) = 0.0

    //  Needed by the inspector
        [HideInInspector] _Culling  ("Culling", Float) = 0.0
    //  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" = "LightweightPipeline"
            "RenderType" = "Opaque"
            "Queue" = "Transparent"
        }
        
        LOD 100

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

            Blend SrcAlpha OneMinusSrcAlpha          
            ZWrite [_ZWrite]
            Cull [_Cull]
            ZTest LEqual

            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 _ALPHATEST_ON

            #if !defined(_ENABLEBASEMAP)
                #if defined(_ALPHATEST_ON)
                    #undef _ALPHATEST_ON
                #endif
                #if defined(_SMOOTHNESS_TEXTURE_ALBEDO_CHANNEL_A)
                    #undef _SMOOTHNESS_TEXTURE_ALBEDO_CHANNEL_A
                #endif
            #endif

            #if defined(_SMOOTHNESS_TEXTURE_ALBEDO_CHANNEL_A)
                #if defined(_ALPHATEST_ON)
                    #undef _ALPHATEST_ON
                #endif
            #endif

        //  We have to sample SH per pixel
            #if defined (EVALUATE_SH_VERTEX)
                #undef EVALUATE_SH_VERTEX
            #endif
            #if defined(EVALUATE_SH_MIXED)
                #undef EVALUATE_SH_MIXED
            #endif

            #pragma shader_feature _SPECULARHIGHLIGHTS_OFF
            #pragma shader_feature _ENVIRONMENTREFLECTIONS_OFF
            #pragma shader_feature _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 Versatile Blend 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);

            //  ///////////////////
            //  Pull positionCS.z towards camera
                float fac = _ProjectionParams.y * 10;
                // fine but clipping issues if we come very close. NANs?
                #if UNITY_REVERSED_Z
                    vertexInput.positionCS.z += _Shift / max(_ProjectionParams.y, vertexInput.positionCS.w) * fac;
                #else
                    vertexInput.positionCS.z -= _Shift / max(_ProjectionParams.y, vertexInput.positionCS.w) * fac;
                #endif
            //  ///////////////////

                output.uv.xy = TRANSFORM_TEX(input.texcoord, _BaseMap);
                // already normalized from normal transform to WS.
                output.normalWS = normalInput.normalWS;
                output.viewDirWS = viewDirWS;
                #if defined(_NORMALMAP)
                    float sign = input.tangentOS.w * GetOddNegativeScale();
                    output.tangentWS = float4(normalInput.tangentWS, 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

                output.positionCS = vertexInput.positionCS;
                output.screenUV = ComputeScreenPos(output.positionCS).xy;

                return output;
            }

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

            inline void InitializeSurfaceData(
                float2 uv,
                out SurfaceDescription outSurfaceData)
            {
                half4 albedoAlpha = SampleAlbedoAlpha(uv.xy, TEXTURE2D_ARGS(_BaseMap, sampler_BaseMap));
                outSurfaceData.alpha = Alpha(albedoAlpha.a, 1, _Cutoff);
                outSurfaceData.albedo = albedoAlpha.rgb * _BaseColor.rgb;

                outSurfaceData.metallic = 0;
                outSurfaceData.specular = _SpecColor.rgb;
                outSurfaceData.smoothness = _Smoothness;
                
                outSurfaceData.smoothness *= albedoAlpha.a;

                outSurfaceData.occlusion = 1;
            
            //  Normal Map
                #if defined (_NORMALMAP)
                    outSurfaceData.normalTS = SampleNormal(uv.xy, TEXTURE2D_ARGS(_BumpMap, sampler_BumpMap), _BumpScale);
                #else
                    outSurfaceData.normalTS = half3(0,0,1);
                #endif

                outSurfaceData.emission = 0;
            }

            void InitializeInputData(VertexOutput input, half3 normalTS, half occlusion, out InputData inputData)
            {
                inputData = (InputData)0;
                inputData.positionWS = input.positionWS;
                
                half3 viewDirWS = SafeNormalize(input.viewDirWS);
                #if defined(_NORMALMAP)
                    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;
                #endif

                inputData.normalWS = NormalizeNormalPerPixel(inputData.normalWS);
                inputData.viewDirectionWS = viewDirWS;

                inputData.fogCoord = input.fogFactorAndVertexLight.x;
                inputData.vertexLighting = input.fogFactorAndVertexLight.yzw;
                inputData.bakedGI = SAMPLE_GI(input.lightmapUV, input.vertexSH * occlusion, inputData.normalWS);

//  this shader is transparent so it will never write to depth normal...
                inputData.normalizedScreenSpaceUV = GetNormalizedScreenSpaceUV(input.positionCS);
                inputData.shadowMask = SAMPLE_SHADOWMASK(input.lightmapUV);
            }

            half4 LitPassFragment(VertexOutput input) : 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);

            //  Get scene depth
                float2 screenUV = input.screenUV.xy / input.positionCS.w;
            //  Fix screenUV for Single Pass Stereo Rendering
                #if defined(UNITY_SINGLE_PASS_STEREO)
                    screenUV.xy = UnityStereoTransformScreenSpaceTex(screenUV.xy);
                #endif
                #if defined(SHADER_API_GLES)
                    float sceneDepth = SAMPLE_DEPTH_TEXTURE_LOD(_CameraDepthTexture, sampler_CameraDepthTexture, screenUV, 0);
                #else
                    float sceneDepth = LOAD_TEXTURE2D_X(_CameraDepthTexture, _CameraDepthTexture_TexelSize.zw * screenUV ).x;
                #endif
                float perspectiveSceneDepth = LinearEyeDepth(sceneDepth, _ZBufferParams);

            //  Depth based blending
                float depthDist = perspectiveSceneDepth - input.positionCS.w + _AlphaShift;
                surfaceData.alpha = saturate(depthDist * _AlphaWidth);
//surfaceData.alpha = 1;

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

                float3 viewDirWS = inputData.viewDirectionWS;

            //  Handle Shadows
                //  Convert linear eye depth to distance in world space
                    float3 camForward = UNITY_MATRIX_V[2].xyz;
                //  Mind the sign of viewDirWS!
                    float sceneDistance = perspectiveSceneDepth / dot(viewDirWS, camForward);
                    float3 scenePositionWS = _WorldSpaceCameraPos - viewDirWS * sceneDistance;
            //  
                float shadowShift = -min(0, input.positionWS.y - _ShadowShiftThreshold - scenePositionWS.y);
                float3 viewShift = shadowShift * _ShadowShiftView * inputData.viewDirectionWS;
                shadowShift *= _ShadowShift;
                float3 finalShift = float3(0, shadowShift, 0) + viewShift;

            //  Limit shift: Depth buffer sample might be some where in space or even sky!
                finalShift *= saturate(1.0 - depthDist);                

            //  Calculate shadowCoord. We have to do it per pixel :(
                #if defined(_MAIN_LIGHT_SHADOWS) && !defined(_RECEIVE_SHADOWS_OFF)
                    #if defined(_MAIN_LIGHT_SHADOWS_CASCADE)
                        half cascadeIndex = ComputeCascadeIndex(input.positionWS + finalShift);
                    #else
                        half cascadeIndex = 0;
                    #endif
                //  As we do not want shadows on the blended parts from the geometry they intersect with we have to "somehow" shift the shadowCoords.
                //  Shifting along view dir: Good...
                    // inputData.shadowCoord = mul(_MainLightWorldToShadow[cascadeIndex], float4(input.positionWS + (1 - surfaceData.alpha) * viewDirWS * _AlphaShift, 1.0));
                //  Shifting along WS Y axis: Gives us false shadows when viewing along the direction of the light: Shadows slip under the blended geometry.
                    // inputData.shadowCoord = mul(_MainLightWorldToShadow[cascadeIndex], float4(input.positionWS   + float3(0, _AlphaShift, 0), 1.0));
                //  Shifting upwards according to distance below surfaces on screen and view
                    inputData.shadowCoord = mul(_MainLightWorldToShadow[cascadeIndex], float4(input.positionWS + finalShift, 1.0));
                #endif

            //  Apply lighting
                //half4 color = UniversalFragmentPBR(inputData, surfaceData.albedo, surfaceData.metallic, surfaceData.specular, surfaceData.smoothness, surfaceData.occlusion, surfaceData.emission, surfaceData.alpha);
                half4 color = LuxFragmentBlendPBR(inputData, surfaceData.albedo, surfaceData.metallic, surfaceData.specular, surfaceData.smoothness, surfaceData.occlusion, surfaceData.emission, surfaceData.alpha,
                    finalShift
                );

            //  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 _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 Versatile Blend 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);

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

                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
            {
                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 - _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 _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 Versatile Blend 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.xy).a;
                    clip (mask - _Cutoff);
                #endif

                return 0;
            }

            ENDHLSL
        }

    //  Depth Normal ----------------------------------------------------- 
    //  this shader is transparent so it will never write to 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 _NORMALMAP
        //     #pragma shader_feature_local_fragment _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 "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

        //  First include all our custom stuff
            #include "Includes/Lux URP Versatile Blend 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 = albedoAlpha.rgb * _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"
}