CircleBtnShader

//圆角
float2 UV = uvs;
float PixelRange = min(min(SizeX/2,SizeY/2),Range);

//当前绘制的像素
float2 CurrentP = float2(UV.x*SizeX,UV.y*SizeY);

//像素坐标参照点
//float2 MiddleP=float2(0.5*SizeX,0.5*SizeY);


//左上角圆心像素坐标
float2 MP1=float2(PixelRange , PixelRange);
//右上角圆心像素坐标
float2 MP2=float2(SizeX - PixelRange , PixelRange);
//左下角圆心像素坐标
float2 MP3=float2(PixelRange , SizeY - PixelRange);
//右下角圆心像素坐标
float2 MP4=float2(SizeX - PixelRange , SizeY - PixelRange);

if (CurrentP.x<MP1.x&&CurrentP.y<MP1.y)
{
 /* 左上角 */
 if (length((CurrentP-MP1))<PixelRange)
 {
  /* code */
  return 1;
 }
 return 0;
}else if (CurrentP.x>MP2.x&&CurrentP.y<MP2.y)
{
 /* 右上角 */
 if (length((CurrentP-MP2))<PixelRange)
 {
  /* code */
  return 1;
 }
 return 0;
}else if (CurrentP.x<MP3.x&&CurrentP.y>MP3.y)
{
 /* 左下角 */
 if (length((CurrentP-MP3))<PixelRange)
 {
  /* code */
  return 1;
 }
 return 0;
}else if (CurrentP.x>MP4.x&&CurrentP.y>MP4.y)
{
 /* 右下角 */
 if (length((CurrentP-MP4))<PixelRange)
 {
  /* code */
  return 1;
 }
 return 0;
}

return 1;