Shader "Unlit URP Shader/Bur"
{
    Properties
    {
        _BaseColor("Base Color",color) = (1,1,1,1)
        //_BaseMap("BaseMap", 2D) = "white" {}
        _MainTex("MainTex",2d)="white"{}
        //_Value("Value", Float) = 3
    }
 HLSLINCLUDE
    #pragma multi_compile _ LIGHTMAP_ON
    #pragma multi_compile _ _MAIN_LIGHT_SHADOWS //接受主光源阴影
    #pragma multi_compile _ _MAIN_LIGHT_SHADOWS_CASCADE //投射主光源的阴影
    #pragma multi_compile _ _SHADOWS_SOFT //软阴影
    #pragma multi_compile _ _ADDITIONAL_LIGHTS //附加光源
    
   

    #include "Packages/com.unity.render-pipelines.universal/ShaderLibrary/Core.hlsl"
    #include "Packages/com.unity.render-pipelines.universal/ShaderLibrary/Lighting.hlsl"



    struct Attributes
    {
        float4 positionOS       : POSITION;
        float2 uv               : TEXCOORD0;
        float3 normal:NORMAL;
    };

    struct Varyings
    {
        float4 positionCS       : SV_POSITION;
        float2 uv               : TEXCOORD0;
        float3 Wnormal          : TEXCOORD1;
        float3 Wpos:TEXCOORD2;
    };

    CBUFFER_START(UnityPerMaterial)
    half4 _BaseColor;
    float4 _MainTex_TexelSize;
    float4 _BaseMap_ST;
    float _Value;
    float2 HorV;
    CBUFFER_END
    TEXTURE2D (_MainTex);SAMPLER(sampler_MainTex);
    //TEXTURE2D (_CameraOpaqueTexture);SAMPLER(sampler_CameraOpaqueTexture);

    Varyings vert(Attributes v)
    {
        Varyings o = (Varyings)0;

        o.positionCS = TransformObjectToHClip(v.positionOS.xyz);
        o.uv = TRANSFORM_TEX(v.uv, _BaseMap);
        o.Wpos = TransformObjectToWorld(v.positionOS);
        o.Wnormal=TransformObjectToWorldNormal(v.normal);

        return o;
    }
   
    
    half4 fragHorV(Varyings i) : SV_Target
    {
        float2 offset=_MainTex_TexelSize.xy;
        half4 c;
        float2 uv=i.positionCS.xy/_ScreenParams.xy;
       
        half4 baseMap = 0.4*SAMPLE_TEXTURE2D(_MainTex, sampler_MainTex,uv);
        c = baseMap ;//* _BaseColor;
        {
            c+= 0.15*SAMPLE_TEXTURE2D(_MainTex, sampler_MainTex,uv+offset*1*_Value*HorV);
            c+= 0.15*SAMPLE_TEXTURE2D(_MainTex, sampler_MainTex,uv+offset*-2*_Value*HorV);
            c+= 0.10 *SAMPLE_TEXTURE2D(_MainTex, sampler_MainTex,uv+offset*2*_Value*HorV);
            c+= 0.10 *SAMPLE_TEXTURE2D(_MainTex, sampler_MainTex,uv+offset*-2*_Value*HorV);
            c+= 0.05 *SAMPLE_TEXTURE2D(_MainTex, sampler_MainTex,uv+offset*3*_Value*HorV);
            c+= 0.05 *SAMPLE_TEXTURE2D(_MainTex, sampler_MainTex,uv+offset*-3*_Value*HorV);
        }
        
        
      
        return c;
    }
    half4 fragBur(Varyings i) : SV_Target
    {
        float2 offset=_MainTex_TexelSize.xy;
       
        half4 c=half4(0,0,0,0);
        float2 uv=i.positionCS.xy/_ScreenParams.xy;
        //c = baseMap ;//* _BaseColor;
        {
            float f=0.4;
            c+= SAMPLE_TEXTURE2D(_MainTex, sampler_MainTex,uv+offset*float2(1,1)*_Value*f);
            c+= SAMPLE_TEXTURE2D(_MainTex, sampler_MainTex,uv+offset*float2(-1,1)*_Value*f);
            c+= SAMPLE_TEXTURE2D(_MainTex, sampler_MainTex,uv+offset*float2(1,-1)*_Value*f);
            c+= SAMPLE_TEXTURE2D(_MainTex, sampler_MainTex,uv+offset*float2(-1,-1)*_Value*f);

            c+= SAMPLE_TEXTURE2D(_MainTex, sampler_MainTex,uv+offset*float2(2,2)*_Value*f);
            c+= SAMPLE_TEXTURE2D(_MainTex, sampler_MainTex,uv+offset*float2(-2,2)*_Value*f);
            c+= SAMPLE_TEXTURE2D(_MainTex, sampler_MainTex,uv+offset*float2(2,-2)*_Value*f);
            c+= SAMPLE_TEXTURE2D(_MainTex, sampler_MainTex,uv+offset*float2(-2,-2)*_Value*f);
            c/=8;
        }
        
        return c;
    }
 
 ENDHLSL
    SubShader
    {
        Tags { "Queue"="Transparent" "RenderType" = "Transparent"  "RenderPipeline" = "UniversalPipeline" }
        ZTest Always
        Cull Off
        LOD 100
        //高斯模糊
        Pass
        {
            Tags {"LightMode" = "UniversalForward"}
            HLSLPROGRAM
            #pragma vertex vert
            #pragma fragment fragHorV
            ENDHLSL
        }
        //快速模糊
        Pass
        {
            Tags {"LightMode" = "UniversalForward"}
            HLSLPROGRAM
            #pragma vertex vert
            #pragma fragment fragBur

            ENDHLSL
        }
    }
}