Unity shader实现高斯模糊效果

本文实例为大家分享了Unity shader实现高斯模糊效果的具体代码，供大家参考，具体内容如下

正常图：

高斯模糊效果图：

shader代码：

Shader "Custom/GaoSiMoHu"
{
Properties
{
_MainTex ("Texture", 2D) = "white" {}
_BlurSize("Blur size",Float)=1.0
}
SubShader
{
ZTest Always
cull off
ZWrite off

CGINCLUDE//这个可以使其他pass块都可以使用，而不用在两个pass里都写，减少了写的次数
sampler2D _MainTex;
half4 _MainTex_TexelSize;
float _BlurSize;
struct v2f{
 float4 pos:SV_POSITION;
 half2 uv[5]:TEXCOORD0;
};
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]).rgb * weight[it];
 sum += tex2D(_MainTex,i.uv[2 * it]).rgb * weight[it];
 }

return fixed4(sum,1.0);
}
ENDCG

Pass{
 NAME "GAUSSIAN_BLUR_VERTICAL"//这个pass的唯一名字，可以在其他地方调用，usepass + 名字
 CGPROGRAM

#pragma vertex vertlurVertical
 #pragma fragment fragBlur
 #include "UnityCG.cginc"

v2f vertlurVertical(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;
 }
 ENDCG
}

Pass{
 NAME "GAUSSIAN_BLUR_HORIZONTAL"
 CGPROGRAM
 #pragma vertex vertlurHorizontal
 #pragma fragment fragBlur
 #include "UnityCG.cginc"

v2f vertlurHorizontal(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.x * 1.0) * _BlurSize;
 o.uv[2]=uv - float2(0.0,_MainTex_TexelSize.x * 1.0) * _BlurSize;
 o.uv[3]=uv + float2(0.0,_MainTex_TexelSize.x * 2.0) * _BlurSize;
 o.uv[4]=uv - float2(0.0,_MainTex_TexelSize.x * 2.0) * _BlurSize;

return o;
 }
 ENDCG
}
}
}

调节_BlurSize即可看到效果

来源：https://blog.csdn.net/yiwei151/article/details/78720896