84 lines
1.8 KiB
Plaintext
84 lines
1.8 KiB
Plaintext
Shader"MyShader/GaussianBlurMask"
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{
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Properties
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{
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[PerRendererData] _MainTex ("Texture", 2D) = "white" {}
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_BlurSize ("Blur Size", Float) = 1.0
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}
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SubShader
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{
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Tags { "Queue"="Transparent" "RenderType"="Transparent" "IgnoreProjector"="True"}
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Cull Off
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Lighting Off
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ZWrite Off
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ZTest[unity_GUIZTestMode]
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Blend SrcAlpha
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OneMinusSrcAlpha
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GrabPass
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{
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} //不带参数名，默认抓取到_GrabTexture，否则只会抓取一次
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Pass
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{
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CGPROGRAM
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#pragma vertex vert
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#pragma fragment frag
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#include "UnityCG.cginc"
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struct a2v
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{
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float4 vertex : POSITION;
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float4 color : COLOR;
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float2 uv : TEXCOORD0;
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};
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struct v2f
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{
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float4 pos : SV_POSITION;
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float4 scrPos : TEXCOORD0;
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float2 uv : TEXCOORD1;
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fixed4 color : TEXCOORD2;
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};
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sampler2D _MainTex;
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float4 _MainTex_ST;
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float _BlurSize;
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sampler2D _GrabTexture; //GrabPass抓取的纹理
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float4 _GrabTexture_TexelSize; //纹理大小
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v2f vert(a2v v)
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{
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v2f o;
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o.pos = UnityObjectToClipPos(v.vertex);
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o.scrPos = ComputeGrabScreenPos(o.pos); //抓取屏幕的坐标
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o.uv = TRANSFORM_TEX(v.uv, _MainTex);
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o.color = v.color;
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return o;
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}
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fixed4 frag(v2f i) : SV_Target
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{
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fixed4 diffuse = tex2D(_MainTex, i.uv);
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fixed4 col = diffuse * i.color;
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float weight[3] = { 0.4026, 0.2442, 0.0545 }; //一维5*5高斯滤波参数，乘起来就是二维的正态分布
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fixed3 sum = fixed3(0, 0, 0);
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for (int x = -2; x <= 2; x++)
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{
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for (int y = -2; y <= 2; y++)
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{
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fixed2 offset = fixed2(x, y) * _GrabTexture_TexelSize.xy * _BlurSize;
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fixed2 cur_UVxy = offset * i.scrPos.z + i.scrPos.xy;
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sum += tex2D(_GrabTexture, cur_UVxy / i.scrPos.w).rgb * weight[abs(x)] * weight[abs(y)];
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}
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}
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return col * fixed4(sum, 1);
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}
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ENDCG
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}
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}
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} |