Shader "Custom RP/Lit"
{
    Properties
    {
        _BaseMap("Texture", 2D) = "white" {}
        _BaseColor("Color", Color) = (0.5, 0.5, 0.5, 1.0)
        // 透明度测试的阈值
        _Cutoff("Alpha Cutoff", Range(0.0, 1.0)) = 0.5
        [Toggle(_CLIPPING)] _Clipping ("Alpha Clipping", Float) = 0
        // 是否接受投影
        [Toggle(_RECEIVE_SHADOWS)] _ReceiveShadows ("Receive Shadows", Float) = 1
        // 阴影模式
        [KeywordEnum(On, Clip, Dither, Off)] _Shadows ("Shadows", Float) = 0
        // 金属度和光滑度
        _Metallic("Metallic", Range(0, 1)) = 0
        _Smoothness("Smoothness", Range(0, 1)) = 0.5
        // 菲涅尔反射强度
        _Fresnel ("Fresnel", Range(0, 1)) = 1
        // 自发光
        [NoScaleOffset] _EmissionMap("Emission", 2D) = "white" {}
        [HDR] _EmissionColor("Emission", Color) = (0.0, 0.0, 0.0, 0.0)
        // 透明通道预乘
        [Toggle(_PREMULTIPLY_ALPHA)] _PremulAlpha("Premultiply Alpha", Float) = 0
        // 设置混合模式
        [Enum(UnityEngine.Rendering.BlendMode)] _SrcBlend ("Src Blend", Float) = 1
        [Enum(UnityEngine.Rendering.BlendMode)] _DstBlend ("Dst Blend", Float) = 0
        // 默认写入深度缓冲区
        [Enum(Off, 0, On, 1)] _ZWrite ("Z Write", Float) = 1

        [HideInInspector] _MainTex("Texture for Lightmap", 2D) = "white" {}
        [HideInInspector] _Color("Color for Lightmap", Color) = (0.5, 0.5, 0.5, 1.0)
    }

    SubShader
    {
        HLSLINCLUDE
        #include "../ShaderLibrary/Common.hlsl"
        #include "LitInput.hlsl"
        ENDHLSL

        Pass
        {
            Tags
            {
                "LightMode" = "CustomLit"
            }

            // 定义混合模式
            Blend [_SrcBlend] [_DstBlend]
            // 是否写入深度
            ZWrite [_ZWrite]

            HLSLPROGRAM
            #pragma target 3.5
            #pragma shader_feature _CLIPPING
            #pragma shader_feature _RECEIVE_SHADOWS
            // 是否透明通道预乘
            #pragma shader_feature _PREMULTIPLY_ALPHA
            #pragma multi_compile _ _DIRECTIONAL_PCF3 _DIRECTIONAL_PCF5 _DIRECTIONAL_PCF7
            #pragma multi_compile _ _CASCADE_BLEND_SOFT _CASCADE_BLEND_DITHER
            #pragma multi_compile _ _SHADOW_MASK_ALWAYS _SHADOW_MASK_DISTANCE
            #pragma multi_compile _ LIGHTMAP_ON
            #pragma multi_compile _ LOD_FADE_CROSSFADE
            #pragma multi_compile_instancing
            #pragma vertex LitPassVertex
            #pragma fragment LitPassFragment
            // 插入相关HLSL代码
            #include "LitPass.hlsl"
            ENDHLSL
        }

        Pass
        {
            Tags
            {
                "LightMode" = "ShadowCaster"
            }

            ColorMask 0

            HLSLPROGRAM
            #pragma target 3.5
            #pragma shader_feature _ _SHADOWS_CLIP _SHADOWS_DITHER
            #pragma multi_compile _ LOD_FADE_CROSSFADE
            #pragma multi_compile_instancing
            #pragma vertex ShadowCasterPassVertex
            #pragma fragment ShadowCasterPassFragment
            #include "ShadowCasterPass.hlsl"
            ENDHLSL
        }

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

            Cull Off

            HLSLPROGRAM
            #pragma target 3.5
            #pragma vertex MetaPassVertex
            #pragma fragment MetaPassFragment
            #include "MetaPass.hlsl"
            ENDHLSL
        }
    }

    CustomEditor "CustomShaderGUI"
}