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Assets/ResRaw/Shader/SimpleGaussianBlur.shader

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+Shader "Hidden/SimpleGaussianBlur"
+{
+    Properties
+    {
+        _MainTex ("Texture", 2D) = "white" {} _BlurSize ("Blur Size", Float) = 1
+    }
+    SubShader
+    {
+        Tags
+        {
+            "RenderType"="Opaque"
+        }
+        Pass
+        {
+            ZTest Always Cull Off ZWrite Off
+            HLSLPROGRAM
+            #pragma vertex vert
+            #pragma fragment frag
+            #include "UnityCG.cginc"
+
+            sampler2D _MainTex;
+            float4 _MainTex_TexelSize;
+            float _BlurSize;
+            float2 _Direction; // (1,0)=horizontal, (0,1)=vertical
+
+            struct appdata
+            {
+                float4 vertex:POSITION;
+                float2 uv:TEXCOORD0;
+            };
+
+            struct v2f
+            {
+                float4 pos:SV_POSITION;
+                float2 uv:TEXCOORD0;
+            };
+
+            v2f vert(appdata v)
+            {
+                v2f o;
+                o.pos = UnityObjectToClipPos(v.vertex);
+                o.uv = v.uv;
+                return o;
+            }
+
+            fixed4 frag(v2f i):SV_Target
+            {
+                float2 texel = _MainTex_TexelSize.xy * _BlurSize * _Direction;
+
+                // 9-tap weights（近似高斯）
+                fixed4 c = tex2D(_MainTex, i.uv) * 0.227027f;
+                c += tex2D(_MainTex, i.uv + texel * 1.384615f) * 0.316216f;
+                c += tex2D(_MainTex, i.uv - texel * 1.384615f) * 0.316216f;
+                c += tex2D(_MainTex, i.uv + texel * 3.230769f) * 0.070270f;
+                c += tex2D(_MainTex, i.uv - texel * 3.230769f) * 0.070270f;
+                return c;
+            }
+            ENDHLSL
+        }
+    }
+}