//Unity Toon Shader/HDRP
//nobuyuki@unity3d.com
//toshiyuki@unity3d.com (Universal RP/HDRP) 

#define APPROXIMATE_POLY_LIGHT_AS_SPHERE_LIGHT

#if SHADERPASS != SHADERPASS_FORWARD
#error SHADERPASS_is_not_correctly_define
#endif

#ifndef SCALARIZE_LIGHT_LOOP
// We perform scalarization only for forward rendering as for deferred loads will already be scalar since tiles will match waves and therefore all threads will read from the same tile.
// More info on scalarization: https://flashypixels.wordpress.com/2018/11/10/intro-to-gpu-scalarization-part-2-scalarize-all-the-lights/ .
// Note that it is currently disabled on gamecore platforms for issues with wave intrinsics and the new compiler, it will be soon investigated, but we disable it in the meantime.
#define SCALARIZE_LIGHT_LOOP (defined(PLATFORM_SUPPORTS_WAVE_INTRINSICS) && !defined(LIGHTLOOP_DISABLE_TILE_AND_CLUSTER) && !defined(SHADER_API_GAMECORE) && SHADERPASS == SHADERPASS_FORWARD)
#endif

#ifdef _WRITE_TRANSPARENT_MOTION_VECTOR
#include "Packages/com.unity.render-pipelines.high-definition/Runtime/RenderPipeline/ShaderPass/MotionVectorVertexShaderCommon.hlsl"

PackedVaryingsType Vert(AttributesMesh inputMesh, AttributesPass inputPass)
{
    VaryingsType varyingsType;
    varyingsType.vmesh = VertMesh(inputMesh);
    return MotionVectorVS(varyingsType, inputMesh, inputPass);
}

#else // _WRITE_TRANSPARENT_MOTION_VECTOR

#include "Packages/com.unity.render-pipelines.high-definition/Runtime/RenderPipeline/ShaderPass/VertMesh.hlsl"

PackedVaryingsType Vert(AttributesMesh inputMesh)
{
    VaryingsType varyingsType;
    varyingsType.vmesh = VertMesh(inputMesh);

    return PackVaryingsType(varyingsType);
}

#endif // _WRITE_TRANSPARENT_MOTION_VECTOR

float ApplyChannelAlpha( float alpha)
{
    return lerp(1.0, alpha, _ComposerMaskMode);
}

#ifdef UNITY_VIRTUAL_TEXTURING
#define VT_BUFFER_TARGET SV_Target1
#define EXTRA_BUFFER_TARGET SV_Target2
#else
#define EXTRA_BUFFER_TARGET SV_Target1
#endif

void Frag(PackedVaryingsToPS packedInput,
#ifdef OUTPUT_SPLIT_LIGHTING
    out float4 outColor : SV_Target0,  // outSpecularLighting
    #ifdef UNITY_VIRTUAL_TEXTURING
       out float4 outVTFeedback : VT_BUFFER_TARGET,
    #endif
    out float4 outDiffuseLighting : EXTRA_BUFFER_TARGET,
    OUTPUT_SSSBUFFER(outSSSBuffer)
#else
    out float4 outColor : SV_Target0
    #ifdef UNITY_VIRTUAL_TEXTURING
        ,out float4 outVTFeedback : VT_BUFFER_TARGET
    #endif
#ifdef _WRITE_TRANSPARENT_MOTION_VECTOR
    , out float4 outMotionVec : EXTRA_BUFFER_TARGET
#endif // _WRITE_TRANSPARENT_MOTION_VECTOR
#endif // OUTPUT_SPLIT_LIGHTING
#ifdef _DEPTHOFFSET_ON
    , out float outputDepth : SV_Depth
#endif
)
{
#ifdef _WRITE_TRANSPARENT_MOTION_VECTOR
    // Init outMotionVector here to solve compiler warning (potentially unitialized variable)
    // It is init to the value of forceNoMotion (with 2.0)
    outMotionVec = float4(2.0, 0.0, 0.0, 0.0);
#endif

    UNITY_SETUP_STEREO_EYE_INDEX_POST_VERTEX(packedInput);
    
    FragInputs input = UnpackVaryingsMeshToFragInputs(packedInput.vmesh);
#if defined(PLATFORM_SUPPORTS_PRIMITIVE_ID_IN_PIXEL_SHADER) && SHADER_STAGE_FRAGMENT
#if (defined(VARYINGS_NEED_PRIMITIVEID) || (SHADERPASS == SHADERPASS_FULL_SCREEN_DEBUG))
    input.primitiveID = packedInput.primitiveID;
#endif
#endif

#if defined(VARYINGS_NEED_CULLFACE) && SHADER_STAGE_FRAGMENT
    input.isFrontFace = IS_FRONT_VFACE(packedInput.cullFace, true, false);
#endif

    float4 UV0 = input.texCoord0;

    // We need to readapt the SS position as our screen space positions are for a low res buffer, but we try to access a full res buffer.
    input.positionSS.xy = _OffScreenRendering > 0 ? (input.positionSS.xy * _OffScreenDownsampleFactor) : input.positionSS.xy;

    uint2 tileIndex = uint2(input.positionSS.xy) / GetTileSize();

    // input.positionSS is SV_Position
    PositionInputs posInput = GetPositionInput(input.positionSS.xy, _ScreenSize.zw, input.positionSS.z, input.positionSS.w, input.positionRWS.xyz, tileIndex);
    
    
#ifdef VARYINGS_NEED_POSITION_WS
    float3 V = GetWorldSpaceNormalizeViewDir(input.positionRWS);

#ifdef MATERIAL_TYPE_EYE
        // Must have view Dir to work
        float2 viewT = TransformObjectToTangent(V, input.tangentToWorld);
        float2 parallaxOffset = viewT;
        parallaxOffset.y = -parallaxOffset.y;
        UV0.xy = clamp(UV0.xy -_EyeParallaxAmount * parallaxOffset, 0, 1);
#endif
    
#else
    // Unused
    float3 V = float3(1.0, 1.0, 1.0); // Avoid the division by 0
#endif
#ifdef _SURFACE_TYPE_TRANSPARENT
    uint featureFlags = LIGHT_FEATURE_MASK_FLAGS_TRANSPARENT;
#else
    uint featureFlags = LIGHT_FEATURE_MASK_FLAGS_OPAQUE;
#endif
    
    SurfaceData tempSurfaceData;
    BuiltinData builtinData;
    GetSurfaceAndBuiltinData(input, V, posInput, tempSurfaceData, builtinData);
    UTSSurfaceData surfaceData = GetUTSSurfaceData(input, V);
    UtsBSDFData bsdfData = ConvertUTSSurfaceDataToUTSBSDFData(surfaceData);

#define UNITY_PROJ_COORD(a) a
#define UNITY_SAMPLE_SCREEN_SHADOW(tex, uv) tex2Dproj( tex, UNITY_PROJ_COORD(uv) ).r
    float inverseClipping = 0.0;
    LightLoopContext context;
    context.shadowContext = InitShadowContext();
    context.shadowValue = 1;
    context.sampleReflection = 0.0;
#if    UNITY_VERSION >= 202120 && UNITY_VERSION < 202320
    context.splineVisibility = -1;
#endif
#ifdef APPLY_FOG_ON_SKY_REFLECTIONS
    context.positionWS       = posInput.positionWS;
#endif

    // With XR single-pass and camera-relative: offset position to do lighting computations from the combined center view (original camera matrix).
    // This is required because there is only one list of lights generated on the CPU. Shadows are also generated once and shared between the instanced views.
    ApplyCameraRelativeXR(posInput.positionWS);

    // Initialize the contactShadow and contactShadowFade fields
    InitContactShadow(posInput, context);
    
    float channelAlpha = 0.0f;

    LightLoopOutput lightLoopOutput;
    ZERO_INITIALIZE(LightLoopOutput, lightLoopOutput);
    
    UtsLightLoop(input, posInput, bsdfData, builtinData, V, featureFlags, lightLoopOutput);

/*
#ifdef _EMISSIVE_SIMPLE
    float4 _Emissive_Tex_var = tex2D(_Emissive_Tex, TRANSFORM_TEX(UV0, _Emissive_Tex));
    float emissiveMask = _Emissive_Tex_var.a;
    emissive = _Emissive_Tex_var.rgb * _Emissive_Color.rgb * emissiveMask;
#elif _EMISSIVE_ANIMATION
                //v.2.0.7 Calculation View Coord UV for Scroll 
    float3 viewNormal_Emissive = (mul(UNITY_MATRIX_V, float4(i_normalDir, 0))).xyz;
    float3 NormalBlend_Emissive_Detail = viewNormal_Emissive * float3(-1, -1, 1);
    float3 NormalBlend_Emissive_Base = (mul(UNITY_MATRIX_V, float4(utsData.viewDirection, 0)).xyz * float3(-1, -1, 1)) + float3(0, 0, 1);
    float3 noSknewViewNormal_Emissive = NormalBlend_Emissive_Base * dot(NormalBlend_Emissive_Base, NormalBlend_Emissive_Detail) / NormalBlend_Emissive_Base.z - NormalBlend_Emissive_Detail;
    float2 _ViewNormalAsEmissiveUV = noSknewViewNormal_Emissive.xy * 0.5 + 0.5;
    float2 _ViewCoord_UV = RotateUV(_ViewNormalAsEmissiveUV, -(utsData.cameraDir * utsData.cameraRoll), float2(0.5, 0.5), 1.0);
    //Invert if it's "inside the mirror".
    if (utsData.signMirror < 0) {
        _ViewCoord_UV.x = 1 - _ViewCoord_UV.x;
    }
    else {
        _ViewCoord_UV = _ViewCoord_UV;
    }
    float2 emissive_uv = lerp(UV0, _ViewCoord_UV, _Is_ViewCoord_Scroll);
    //
    float4 _time_var = _Time;
    float _base_Speed_var = (_time_var.g * _Base_Speed);
    float _Is_PingPong_Base_var = lerp(_base_Speed_var, sin(_base_Speed_var), _Is_PingPong_Base);
    float2 scrolledUV = emissive_uv + float2(_Scroll_EmissiveU, _Scroll_EmissiveV) * _Is_PingPong_Base_var;
    float rotateVelocity = _Rotate_EmissiveUV * 3.141592654;
    float2 _rotate_EmissiveUV_var = RotateUV(scrolledUV, rotateVelocity, float2(0.5, 0.5), _Is_PingPong_Base_var);
    float4 _Emissive_Tex_var = tex2D(_Emissive_Tex, TRANSFORM_TEX(UV0, _Emissive_Tex));
    float emissiveMask = _Emissive_Tex_var.a;
    _Emissive_Tex_var = tex2D(_Emissive_Tex, TRANSFORM_TEX(_rotate_EmissiveUV_var, _Emissive_Tex));
    float _colorShift_Speed_var = 1.0 - cos(_time_var.g * _ColorShift_Speed);
    float viewShift_var = smoothstep(0.0, 1.0, max(0, dot(utsData.normalDirection, utsData.viewDirection)));
    float4 colorShift_Color = lerp(_Emissive_Color, lerp(_Emissive_Color, _ColorShift, _colorShift_Speed_var), _Is_ColorShift);
    float4 viewShift_Color = lerp(_ViewShift, colorShift_Color, viewShift_var);
    float4 emissive_Color = lerp(colorShift_Color, viewShift_Color, _Is_ViewShift);
    emissive = emissive_Color.rgb * _Emissive_Tex_var.rgb * emissiveMask;

    //
                    //v.2.0.6: GI_Intensity with Intensity Multiplier Filter
#endif
    */
    
    // We directly calculate custome main light during the light loop in upper code to avoid extra calculation
    //customMainLight = GetCustomMainLightData(builtinData, mainPunctualLight);

    /*
#if _SHADOW_MODE_SDF || (_RECEIVE_HAIR_SHADOW_ON && ENABLE_UTS_HAIR_SHAOW)
    float3 defaultLightDirection = normalize(UNITY_MATRIX_V[2].xyz + UNITY_MATRIX_V[1].xyz);
    float3 defaultLightColor = saturate(max(float3(0.05, 0.05, 0.05) * _Unlit_Intensity, max(ShadeSH9(float4(0.0, 0.0, 0.0, 1.0)), ShadeSH9(float4(0.0, -1.0, 0.0, 1.0)).rgb) * _Unlit_Intensity));

    float3 customLightDirection = normalize(mul(UNITY_MATRIX_M, float4(((float3(1.0, 0.0, 0.0) * _Offset_X_Axis_BLD * 10) + (float3(0.0, 1.0, 0.0) * _Offset_Y_Axis_BLD * 10) + (float3(0.0, 0.0, -1.0) * lerp(-1.0, 1.0, _Inverse_Z_Axis_BLD))), 0)).xyz);
    float3 lightDirection = normalize(lerp(defaultLightDirection, customMainLight.lightDirection.xyz, any(customMainLight.lightDirection.xyz)));
    lightDirection = lerp(lightDirection, customLightDirection, _Is_BLD);
    float3 originalLightColor = customMainLight.lightColor.rgb;

    originalLightColor = lerp(originalLightColor, clamp(originalLightColor, ConvertFromEV100(_ToonEvAdjustmentValueMin ), ConvertFromEV100(_ToonEvAdjustmentValueMax)), _ToonEvAdjustmentCurve)  * _Light_Intensity_Multiplier;
    float3 lightColor = lerp(max(defaultLightColor, originalLightColor), max(defaultLightColor, saturate(originalLightColor)), max(_Is_Filter_LightColor, _ToonLightHiCutFilter));

    float4 _1st_ShadeMap_var = lerp(SAMPLE_TEXTURE2D(_1st_ShadeMap, sampler_BaseColorMap,TRANSFORM_TEX(UV0, _1st_ShadeMap)), _MainTex_var, _Use_BaseAs1st);
    float3 _1st_Shade_var = lerp((_1st_ShadeMap_var.rgb * _1st_ShadeColor.rgb), ((_1st_ShadeMap_var.rgb * _1st_ShadeColor.rgb) * lightColor), _Is_LightColor_1st_Shade);

    float systemShadowValue = lerp(1.0f, saturate(customMainLight.shadowValue * 2.0f), _Set_SystemShadowsToBase);
#endif

#if _SHADOW_MODE_SDF
    // modified by Suomi @ 20230902 - SDFResult is used to sample SDF texture on the correct side
    
    float angle;
    bool rightside;
    float2 SDF_UV = TRANSFORM_TEX(UV0, _BaseColorMap);
    float4 sdfRes = SDFResult(rightside, angle, customMainLight.lightDirection, SDF_UV);
    float sdfShadowValue = 1.0f - SDFMask(angle, sdfRes.r);

    utsAggregateLighting.directDiffuse = lerp(_1st_Shade_var, bsdfData.diffuseColor * _BaseColor.rgb * lightColor, sdfShadowValue * systemShadowValue);
    utsAggregateLighting.directSpecular = lerp(0, utsAggregateLighting.directSpecular, sdfShadowValue * systemShadowValue);
    utsAggregateLighting.directSpecular += _SDFNoseHighlightCoef * SDFNoseHighlight(angle, sdfRes.g, rightside, SDF_UV) * lightColor;
#endif

#if _RECEIVE_HAIR_SHADOW_ON && ENABLE_UTS_HAIR_SHAOW
    // Push the face fragment view space position towards the light for a little bit
    float hairShadowOpacity = saturate(Remap(length(posInput.positionWS), float2(_HairShadowFadeOutDistance, _HairShadowFadeInDistance), float2(0, 1)));
    
    float3 viewLightDir = TransformWorldToViewDir(customMainLight.lightDirection); //  / posInput.deviceDepth; when linearDepth grows large, the movement amount should be lower since we are getting further from the face.
    float3 cameraDirOS = normalize(TransformWorldToObject(GetCameraPositionWS()));
    float shadowLengthY = _HairShadowDistance * 5.0 * max(0.5, posInput.linearDepth * _HairShadowDistanceScaleFactor) / posInput.linearDepth;
    float2 shadowLength = float2(shadowLengthY * 2.0f, shadowLengthY);
    
    float3 camDirOS = normalize(TransformWorldToObject(GetCameraPositionWS()));
    float camDirFactor = 1 - smoothstep(0.1, 0.9, camDirOS.y);
    shadowLength.y *= camDirFactor;

    float2 samplingPoint = (input.positionSS.xy + shadowLength * viewLightDir.xy * (_ScreenSize.xy / float2 (1920.0f, 1080.0f))) * _ScreenSize.zw; // Use 1080p as the reference resolution to achieve consistent shadow lengths across various screen resolutions.

    // Then sample the hair buffer, to see if the fragment lands in shadow.
    float2 scaledUVs = samplingPoint * _HairShadowRTHandleScale; // We have to including the scaling factor for our shadow map since we are not going to allocate new texture if the rendering resolution changed.
    float hairDepth = SAMPLE_TEXTURE2D(_HairShadowTex, s_trilinear_clamp_sampler, scaledUVs).r;
    float depthCorrect = posInput.deviceDepth <= hairDepth + _HairShadowDepthBias ? 1 : 0; // Hair < Face means Hair are closer to camera 
    // Note that we have LinearEyeDepth in the buffer. A comparison of depth is needed so that we don't project the shadow of hair behind the face.
    float hairShadow = lerp(0,hairShadowOpacity,depthCorrect);

    utsAggregateLighting.directDiffuse = lerp(utsAggregateLighting.directDiffuse, _1st_Shade_var, hairShadow * systemShadowValue);
    utsAggregateLighting.directSpecular = lerp(utsAggregateLighting.directSpecular, 0, hairShadow * systemShadowValue);
#endif
*/  
    //outColor.rgb = lightLoopOutput.diffuseLighting + lightLoopOutput.specularLighting;
    //outColor.a = 1.0;
    //return;
    
    float3 finalColor = lightLoopOutput.diffuseLighting + lightLoopOutput.specularLighting;
    
#ifdef _IS_TRANSCLIPPING_OFF
    
    outColor = float4(finalColor, 1 * ApplyChannelAlpha(channelAlpha));

#elif _IS_TRANSCLIPPING_ON
    
    float Set_Opacity = saturate((inverseClipping + _Tweak_transparency));
    
    outColor = EvaluateAtmosphericScattering(posInput, V, float4(finalColor, 1));
    outColor = float4(outColor.rgb, Set_Opacity * ApplyChannelAlpha(channelAlpha));
#endif

#if _MATERIAL_TYPE_FRONTHAIR && ENABLE_UTS_HAIR_BLENDING
    float2 screenUV = posInput.positionNDC * _HairBlendingRTHandleScale.xy;
    float4 hairBlendingMap = SAMPLE_TEXTURE2D(_HairBlendingTex, s_trilinear_clamp_sampler, screenUV);
    outColor.rgb = lerp(outColor.rgb, hairBlendingMap.rgb, hairBlendingMap.a * _HairBlendingFactor);
#endif

#if UTS_DEBUG_SHADOWMAP || UTS_DEBUG_SELFSHADOW
    outColor.rgb = 1;
#ifdef UTS_DEBUG_SELFSHADOW
    outColor.rgb = min(finalColor, outColor.rgb);
#endif

#ifdef UTS_DEBUG_SHADOWMAP
#ifdef UTS_DEBUG_SHADOWMAP_BINALIZATION
    outColor.rgb = min(context.shadowValue < 0.9f ? clamp(context.shadowValue - 0.2, 0.0, 0.9) : 1.0f, outColor.rgb);
#else
    outColor.rgb = min(context.shadowValue, outColor.rgb);
#endif
#endif // ifdef UTS_DEBUG_SHADOWMAP
#endif // defined(UTS_DEBUG_SHADOWMAP) || defined(UTS_DEBUG_SELFSHADOW)
    
#ifdef _DEPTHOFFSET_ON
    outputDepth = posInput.deviceDepth;
#endif
#ifdef UNITY_VIRTUAL_TEXTURING

    outVTFeedback = builtinData.vtPackedFeedback;
#endif

}