毛玻璃效果shader

Shader "Custom/WaterBlur" {
Properties {
_blurSizeXY("BlurSizeXY", Range(0,10)) = 2
}
SubShader {

// Draw ourselves after all opaque geometry
Tags { "Queue" = "Transparent" }

// Grab the screen behind the object into _GrabTexture
GrabPass { }

// Render the object with the texture generated above
Pass {

CGPROGRAM
#pragma debug
#pragma vertex vert
#pragma fragment frag
#pragma target 3.0

sampler2D _GrabTexture : register(s0);
float _blurSizeXY;

struct data {

float4 vertex : POSITION;

float3 normal : NORMAL;

};

struct v2f {

float4 position : POSITION;

float4 screenPos : TEXCOORD0;

};

v2f vert(data i){

v2f o;

o.position = mul(UNITY_MATRIX_MVP, i.vertex);

o.screenPos = o.position;

return o;

}

half4 frag( v2f i ) : COLOR

{

float2 screenPos = i.screenPos.xy / i.screenPos.w;
float depth= _blurSizeXY*0.0005;

screenPos.x = (screenPos.x + 1) * 0.5;

screenPos.y = 1-(screenPos.y + 1) * 0.5;

half4 sum = half4(0.0h,0.0h,0.0h,0.0h);
sum += tex2D( _GrabTexture, float2(screenPos.x-5.0 * depth, screenPos.y+5.0 * depth)) * 0.025;
sum += tex2D( _GrabTexture, float2(screenPos.x+5.0 * depth, screenPos.y-5.0 * depth)) * 0.025;

sum += tex2D( _GrabTexture, float2(screenPos.x-4.0 * depth, screenPos.y+4.0 * depth)) * 0.05;
sum += tex2D( _GrabTexture, float2(screenPos.x+4.0 * depth, screenPos.y-4.0 * depth)) * 0.05;

sum += tex2D( _GrabTexture, float2(screenPos.x-3.0 * depth, screenPos.y+3.0 * depth)) * 0.09;
sum += tex2D( _GrabTexture, float2(screenPos.x+3.0 * depth, screenPos.y-3.0 * depth)) * 0.09;

sum += tex2D( _GrabTexture, float2(screenPos.x-2.0 * depth, screenPos.y+2.0 * depth)) * 0.12;
sum += tex2D( _GrabTexture, float2(screenPos.x+2.0 * depth, screenPos.y-2.0 * depth)) * 0.12;

sum += tex2D( _GrabTexture, float2(screenPos.x-1.0 * depth, screenPos.y+1.0 * depth)) *  0.15;
sum += tex2D( _GrabTexture, float2(screenPos.x+1.0 * depth, screenPos.y-1.0 * depth)) *  0.15;

sum += tex2D( _GrabTexture, screenPos-5.0 * depth) * 0.025;
sum += tex2D( _GrabTexture, screenPos-4.0 * depth) * 0.05;
sum += tex2D( _GrabTexture, screenPos-3.0 * depth) * 0.09;
sum += tex2D( _GrabTexture, screenPos-2.0 * depth) * 0.12;
sum += tex2D( _GrabTexture, screenPos-1.0 * depth) * 0.15;
sum += tex2D( _GrabTexture, screenPos) * 0.16;
sum += tex2D( _GrabTexture, screenPos+5.0 * depth) * 0.15;
sum += tex2D( _GrabTexture, screenPos+4.0 * depth) * 0.12;
sum += tex2D( _GrabTexture, screenPos+3.0 * depth) * 0.09;
sum += tex2D( _GrabTexture, screenPos+2.0 * depth) * 0.05;
sum += tex2D( _GrabTexture, screenPos+1.0 * depth) * 0.025;

return sum/2;

}
ENDCG
}
}

Fallback Off
}