99 lines
3.0 KiB
Plaintext
99 lines
3.0 KiB
Plaintext
Shader "NLD_URP/NLD_UI_GaussianBlur"
|
||
{
|
||
Properties
|
||
{
|
||
[PerRendererData] _MainTex("MainTex", 2D) = "white" {}
|
||
//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
|
||
_Color("Color", color) = (1,1,1,1)
|
||
_Sigma("Sigma", Range(1, 30)) = 20
|
||
//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
|
||
_Ratio("Sigma Ratio", Range(1, 4)) = 2
|
||
}
|
||
|
||
SubShader
|
||
{
|
||
Cull Off
|
||
Lighting Off
|
||
ZWrite Off
|
||
Blend One OneMinusSrcAlpha
|
||
|
||
Tags
|
||
{
|
||
"Queue" = "Transparent"
|
||
"IgnoreProjector" = "True"
|
||
"RenderType" = "Transparent"
|
||
"PreviewType" = "Plane"
|
||
"CanUseSpriteAtlas" = "True"
|
||
}
|
||
|
||
Pass
|
||
{
|
||
CGPROGRAM
|
||
#pragma vertex vert
|
||
#pragma fragment frag
|
||
#pragma multi_compile _ PIXELSNAP_ON
|
||
|
||
#include "UnityCG.cginc"
|
||
|
||
struct appdata
|
||
{
|
||
float4 vertex : POSITION;
|
||
float2 uv : TEXCOORD0;
|
||
};
|
||
|
||
struct v2f
|
||
{
|
||
float2 uv : TEXCOORD0;
|
||
float4 vertex : SV_POSITION;
|
||
};
|
||
|
||
sampler2D _MainTex;
|
||
fixed4 _Color;
|
||
float4 _MainTex_ST;
|
||
float4 _MainTex_TexelSize;
|
||
|
||
float _Sigma;
|
||
float _Ratio;
|
||
|
||
// 计算高斯权重
|
||
float computerBluGauss(float x, float sigma)
|
||
{
|
||
return 0.39894 * exp(-0.5 * x * x / (0.20 * sigma)) / sigma * sigma;
|
||
}
|
||
|
||
v2f vert(appdata v)
|
||
{
|
||
v2f o;
|
||
o.vertex = UnityObjectToClipPos(v.vertex);
|
||
o.uv = TRANSFORM_TEX(v.uv, _MainTex);
|
||
|
||
return o;
|
||
}
|
||
|
||
fixed4 frag (v2f i) : SV_Target
|
||
{
|
||
float sum = 0;
|
||
fixed4 col = fixed4(0, 0, 0, 0);
|
||
for (float j = -_Ratio * _Sigma; j <= _Ratio * _Sigma; j += _Sigma)
|
||
{
|
||
for (float k = -_Ratio * _Sigma; k <= _Ratio * _Sigma; k += _Sigma)
|
||
{
|
||
float2 _offset = float2(j, k) * _MainTex_TexelSize.xy;
|
||
float2 blurUV = i.uv + _offset;
|
||
if(blurUV.x >= 0 && blurUV.x <= 1 && blurUV.y >= 0 && blurUV.y <= 1)
|
||
{
|
||
//二维正态分布，公式：G(x,y)=exp(-(x²+y²)/(2σ²))/(2πσ²)
|
||
float weight = exp((_offset.x * _offset.x + _offset.y * _offset.y)/(-2 * _Sigma * _Sigma))/(6.2831852 * _Sigma * _Sigma);
|
||
col += tex2D(_MainTex, blurUV) * weight;
|
||
sum += weight;
|
||
}
|
||
}
|
||
}
|
||
|
||
return (col / sum) * _Color;
|
||
}
|
||
ENDCG
|
||
}
|
||
}
|
||
}
|