99 lines
3.0 KiB
Plaintext
99 lines
3.0 KiB
Plaintext
Shader "NLD_URP/UI_GaussianBlur"
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{
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Properties
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{
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[PerRendererData] _MainTex("MainTex", 2D) = "white" {}
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//值越大，正态分布图像越扁，距离远的像素的权重越高，颗粒感越明显
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_Color("Color", color) = (1,1,1,1)
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_Sigma("Sigma", Range(1, 30)) = 20
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//多少倍的Sigma，值越大，采样越多，越细腻，会循环(2n+1)(2n+1)次，所以这个值不要太大，太大也没用
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_Ratio("Sigma Ratio", Range(1, 4)) = 2
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}
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SubShader
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{
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Cull Off
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Lighting Off
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ZWrite Off
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Blend One OneMinusSrcAlpha
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Tags
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{
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"Queue" = "Transparent"
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"IgnoreProjector" = "True"
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"RenderType" = "Transparent"
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"PreviewType" = "Plane"
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"CanUseSpriteAtlas" = "True"
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}
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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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#pragma multi_compile _ PIXELSNAP_ON
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#include "UnityCG.cginc"
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struct appdata
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{
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float4 vertex : POSITION;
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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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float2 uv : TEXCOORD0;
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float4 vertex : SV_POSITION;
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};
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sampler2D _MainTex;
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fixed4 _Color;
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float4 _MainTex_ST;
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float4 _MainTex_TexelSize;
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float _Sigma;
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float _Ratio;
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// 计算高斯权重
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float computerBluGauss(float x, float sigma)
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{
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return 0.39894 * exp(-0.5 * x * x / (0.20 * sigma)) / sigma * sigma;
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}
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v2f vert(appdata v)
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{
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v2f o;
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o.vertex = UnityObjectToClipPos(v.vertex);
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o.uv = TRANSFORM_TEX(v.uv, _MainTex);
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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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float sum = 0;
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fixed4 col = fixed4(0, 0, 0, 0);
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for (float j = -_Ratio * _Sigma; j <= _Ratio * _Sigma; j += _Sigma)
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{
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for (float k = -_Ratio * _Sigma; k <= _Ratio * _Sigma; k += _Sigma)
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{
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float2 _offset = float2(j, k) * _MainTex_TexelSize.xy;
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float2 blurUV = i.uv + _offset;
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if(blurUV.x >= 0 && blurUV.x <= 1 && blurUV.y >= 0 && blurUV.y <= 1)
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{
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//二维正态分布，公式：G(x,y)=exp(-(x²+y²)/(2σ²))/(2πσ²)
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float weight = exp((_offset.x * _offset.x + _offset.y * _offset.y)/(-2 * _Sigma * _Sigma))/(6.2831852 * _Sigma * _Sigma);
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col += tex2D(_MainTex, blurUV) * weight;
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sum += weight;
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}
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}
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}
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return (col / sum) * _Color;
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}
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ENDCG
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}
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}
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}
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