yzyCli/u3d/Assets/LuaFramework/AssetBundleRes/scene/shader/BlurEffect.shader

Shader "SaberShad/BlurEffect"
{
    Properties{
        _MainTex("Base(RGB)", 2D) = "white"{}
        _BlurSize ("Blur Size", Float) = 1.0
    }
    SubShader{
        CGINCLUDE
        #include "UnityCG.cginc"
        sampler2D _MainTex;
        half4 _MainTex_TexelSize;
        float _BlurSize;

        struct v2f {
            float4 pos : SV_POSITION;
            half2 uv[5] : TEXCOORD0;
        };

        v2f vertBlurVertical(appdata_img v)
        {
            v2f o;
            o.pos = UnityObjectToClipPos(v.vertex);
            half2 uv = v.texcoord;

            o.uv[0] = uv;
            o.uv[1] = uv + float2(0.0, _MainTex_TexelSize.y * 1.0) * _BlurSize;
            o.uv[2] = uv - float2(0.0, _MainTex_TexelSize.y * 1.0) * _BlurSize;
            o.uv[3] = uv + float2(0.0, _MainTex_TexelSize.y * 2.0) * _BlurSize;
            o.uv[4] = uv - float2(0.0, _MainTex_TexelSize.y * 2.0) * _BlurSize;

            return o;
        }

        v2f vertBlurHorizontal(appdata_img v)
        {
            v2f o;
            o.pos = UnityObjectToClipPos(v.vertex);
            half2 uv = v.texcoord;

            o.uv[0] = uv;
            o.uv[1] = uv + float2(_MainTex_TexelSize.x * 1.0, 0.0) * _BlurSize;
            o.uv[2] = uv - float2(_MainTex_TexelSize.x * 1.0, 0.0) * _BlurSize;
            o.uv[3] = uv + float2(_MainTex_TexelSize.x * 2.0, 0.0) * _BlurSize;
            o.uv[4] = uv - float2(_MainTex_TexelSize.x * 2.0, 0.0) * _BlurSize;
            
            return o;
        }

        fixed4 fragBlur(v2f i) : SV_Target
        {
            float weight[3] = {0.4026, 0.2442, 0.0545};

            fixed3 sum = tex2D(_MainTex, i.uv[0]).rgb * weight[0];

            for(int it = 1; it < 3; it++)
            {
                sum += tex2D(_MainTex, i.uv[it*2-1]).rgb * weight[it];
                sum += tex2D(_MainTex, i.uv[it*2]).rgb * weight[it];
            }

            return fixed4 (sum, 1.0);
        }
        ENDCG
        
        ZTest Always
        Cull Off
        ZWrite Off
        Pass{
            Name "GAUSSIAN_BLUR_HORIZONTAL"
            CGPROGRAM
            #pragma vertex vertBlurHorizontal
            #pragma fragment fragBlur
            ENDCG
        }

        Pass{
            Name "GAUSSIAN_BLUR_VERTICAL"
            CGPROGRAM
            #pragma vertex vertBlurVertical
            #pragma fragment fragBlur
            ENDCG
        }
    }

    Fallback Off
}