Unity切圆角矩形

转载地址：http://www.manew.com/blog-48527-3473.html

Shader "Custom/NewShader" {

Properties {
_MainTex ("Base (RGB)", 2D) = "white" {}
_RADIUSBUCE("_RADIUSBUCE",Range(0,0.5))=0.2
}
SubShader
{
pass
{

CGPROGRAM

#pragma exclude_renderers gles
#pragma vertex vert
#pragma fragment frag
#include "unitycg.cginc"
float _RADIUSBUCE;
sampler2D _MainTex;


struct v2f
{
float4 pos : SV_POSITION ;
float2 ModeUV: TEXCOORD0;
float2 RadiusBuceVU : TEXCOORD1;
};
v2f vert(appdata_base v)
{
v2f o;
o.pos=mul(UNITY_MATRIX_MVP,v.vertex); //v.vertex;
o.ModeUV=v.texcoord;
o.RadiusBuceVU=v.texcoord-float2(0.5,0.5);       //将模型UV坐标原点置为中心原点,为了方便计算


return o;
}




fixed4 frag(v2f i):COLOR
{
fixed4 col;
col=(0,1,1,0);


if(abs(i.RadiusBuceVU.x)<0.5-_RADIUSBUCE||abs(i.RadiusBuceVU.y)<0.5-_RADIUSBUCE)    //即上面说的|x|<(0.5-r)或|y|<(0.5-r)
{

col=tex2D(_MainTex,i.ModeUV);


}
else
{
if(length( abs( i.RadiusBuceVU)-float2(0.5-_RADIUSBUCE,0.5-_RADIUSBUCE)) <_RADIUSBUCE)
{
col=tex2D(_MainTex,i.ModeUV);

}
else
{
discard;
}
}
return col; 
}
ENDCG

}
}
}