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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

}

}

}