// NiloToon Character Fur Shell Only Shader
// Use this shader on a second material slot to render fur shells
// The base mesh should use NiloToonCharacter or NiloToonCharacterFur shader

Shader "Universal Render Pipeline/NiloToon/NiloToon_Character_Fur_ShellOnly"
{
    Properties
    {
        [Header(Base Color)]
        [Space(5)]
        [MainTexture] _BaseMap("Base Map", 2D) = "white" {}
        [HDR][MainColor] _BaseColor("Base Color", Color) = (1,1,1,1)
        _Cutoff("Alpha Cutoff", Range(0.0, 1.0)) = 0.5

        [Header(Normal Map)]
        [Space(5)]
        [Toggle(_NORMALMAP)] _UseNormalMap("Enable Normal Map", Float) = 0
        [Normal] _BumpMap("Normal Map", 2D) = "bump" {}
        _BumpScale("Normal Scale", Range(0, 2)) = 1.0

        [Header(Fur Shape)]
        [Space(5)]
        _FurNoiseMask("Fur Noise Mask", 2D) = "white" {}
        _FurMask("Fur Mask (where fur appears)", 2D) = "white" {}
        _FurLengthMask("Fur Length Mask", 2D) = "white" {}
        _FurVector("Fur Direction (XYZ) + Length (W)", Vector) = (0, 0, 1, 0.02)
        [Normal] _FurVectorTex("Fur Direction Map (Normal)", 2D) = "bump" {}
        _FurVectorScale("Fur Direction Scale", Range(-10, 10)) = 1.0
        _FurGravity("Fur Gravity", Range(0, 1)) = 0.25
        _FurRandomize("Fur Randomize", Range(0, 1)) = 0.1
        _FurAO("Fur Ambient Occlusion", Range(0, 1)) = 0.5

        [Header(Shell Layers)]
        [Space(5)]
        [IntRange] _FurLayerNum("Fur Layer Count", Range(1, 3)) = 2
        _FurRootOffset("Fur Root Offset", Range(-1, 0)) = 0

        [Header(Fur Rim Light)]
        [Space(5)]
        [HDR] _FurRimColor("Fur Rim Color", Color) = (1, 1, 1, 1)
        _FurRimFresnelPower("Fur Rim Fresnel Power", Range(0.01, 50)) = 3.0
        _FurRimAntiLight("Fur Rim Anti-Light", Range(0, 1)) = 0.5

        [Header(Cel Shading)]
        [Space(5)]
        _CelShadeMidPoint("Cel Shade Mid Point", Range(-1, 1)) = 0
        _CelShadeSoftness("Cel Shade Softness", Range(0, 1)) = 0.1

        [Header(Shadow Color)]
        [Space(5)]
        [Toggle(_SHADOW_COLOR)] _EnableShadowColor("Enable Shadow Color", Float) = 0
        [HDR] _ShadowColor("Shadow Tint Color", Color) = (1, 1, 1, 1)
        _ShadowBrightness("Shadow Brightness", Range(0, 2)) = 1.0
        _ShadowHueShift("Shadow Hue Shift", Range(-0.5, 0.5)) = 0
        _ShadowSaturationBoost("Shadow Saturation Boost", Range(0, 2)) = 1.0
        _ShadowValueMultiplier("Shadow Value Multiplier", Range(0, 2)) = 1.0

        [Header(MatCap Additive)]
        [Space(5)]
        [Toggle(_MATCAP_ADD)] _UseMatCapAdd("Enable MatCap (Add)", Float) = 0
        _MatCapAddMap("MatCap Add Map", 2D) = "black" {}
        [HDR] _MatCapAddColor("MatCap Add Color", Color) = (1, 1, 1, 1)
        _MatCapAddIntensity("MatCap Add Intensity", Range(0, 5)) = 1.0
        _MatCapAddMask("MatCap Add Mask", 2D) = "white" {}

        [Header(MatCap Multiply)]
        [Space(5)]
        [Toggle(_MATCAP_MUL)] _UseMatCapMul("Enable MatCap (Multiply)", Float) = 0
        _MatCapMulMap("MatCap Multiply Map", 2D) = "white" {}
        _MatCapMulIntensity("MatCap Multiply Intensity", Range(0, 2)) = 1.0

        [Header(Emission)]
        [Space(5)]
        [Toggle(_EMISSION)] _UseEmission("Enable Emission", Float) = 0
        _EmissionMap("Emission Map", 2D) = "white" {}
        [HDR] _EmissionColor("Emission Color", Color) = (0, 0, 0, 1)
        _EmissionIntensity("Emission Intensity", Range(0, 10)) = 1.0

        [Header(Occlusion)]
        [Space(5)]
        [Toggle(_OCCLUSIONMAP)] _UseOcclusion("Enable Occlusion Map", Float) = 0
        _OcclusionMap("Occlusion Map", 2D) = "white" {}
        _OcclusionStrength("Occlusion Strength", Range(0, 1)) = 1.0

        [Header(Outline)]
        [Space(5)]
        _OutlineWidth("Outline Width", Range(0, 10)) = 0
        [HDR] _OutlineColor("Outline Color", Color) = (0, 0, 0, 1)
        _OutlineWidthMask("Outline Width Mask", 2D) = "white" {}

        [Header(Rendering Options)]
        [Space(5)]
        [Enum(UnityEngine.Rendering.CullMode)] _Cull("Cull Mode", Float) = 2
        [Enum(UnityEngine.Rendering.CullMode)] _FurCull("Fur Cull Mode", Float) = 0
        [Enum(Off, 0, On, 1)] _ZWrite("ZWrite", Float) = 0
        _FurZWrite("Fur ZWrite", Float) = 0
        [Enum(UnityEngine.Rendering.CompareFunction)] _ZTest("ZTest", Float) = 4
    }

    SubShader
    {
        Tags
        {
            "RenderType" = "Transparent"
            "RenderPipeline" = "UniversalPipeline"
            "IgnoreProjector" = "True"
            "Queue" = "Transparent-50"
        }
        LOD 300

        // Fur Shell Pass
        Pass
        {
            Name "FurShell"
            Tags { "LightMode" = "UniversalForward" }

            Cull [_FurCull]
            ZWrite [_FurZWrite]
            ZTest LEqual
            Blend SrcAlpha OneMinusSrcAlpha, One OneMinusSrcAlpha

            HLSLPROGRAM
            #pragma target 4.5
            #pragma require geometry

            #pragma shader_feature_local _NORMALMAP
            #pragma shader_feature_local _SHADOW_COLOR
            #pragma shader_feature_local _MATCAP_ADD
            #pragma shader_feature_local _MATCAP_MUL
            #pragma shader_feature_local _RIMLIGHT
            #pragma shader_feature_local _EMISSION
            #pragma shader_feature_local _OCCLUSIONMAP

            #pragma multi_compile _ _MAIN_LIGHT_SHADOWS _MAIN_LIGHT_SHADOWS_CASCADE _MAIN_LIGHT_SHADOWS_SCREEN
            #pragma multi_compile _ _ADDITIONAL_LIGHTS_VERTEX _ADDITIONAL_LIGHTS
            #pragma multi_compile_fragment _ _ADDITIONAL_LIGHT_SHADOWS
            #pragma multi_compile_fragment _ _SHADOWS_SOFT
            #pragma multi_compile_fog

            #pragma multi_compile_instancing
            #pragma instancing_options renderinglayer

            #pragma vertex vert_fur
            #pragma geometry geom_fur
            #pragma fragment frag_fur

            #define NILOTOON_FUR_SHELL_PASS
            #include "NiloToonCharacterFur_HLSL/NiloToonCharacterFur_Shared.hlsl"
            #include "NiloToonCharacterFur_HLSL/NiloToonCharacterFur_Geometry.hlsl"
            #include "NiloToonCharacterFur_HLSL/NiloToonCharacterFur_Fragment.hlsl"
            ENDHLSL
        }
    }

    FallBack Off
}