# CONST[0] = (-0.1, 0, 0, 0)

# d = length(uv)
src0.rgb = temp[0] :
  temp[0].r    = DP3 src0.rg0 src0.rg0 ;
src0.rgb = temp[0] :
  temp[0].a    = RSQ |src0.r| ;
src0.a   = temp[0] :
  temp[0].a    = RCP src0.a ;

# d = abs(d - 0.5) * 1 + -0.1
src0.rgb = float(48), # 0.5
src1.rgb = temp[0],   # d
src2.rgb = const[0],  # -0.1
srcp.rgb = sub :      # (src1.rgb - src0.rgb)
  temp[0].r    = MAD |srcp.r00| src0.100 src2.r00 ;

# d = (d >= 0.0) ? 1.0 : 0.0
# out.rgba = vec4(d, 0, 0, 1)
OUT TEX_SEM_WAIT
src0.rgb = temp[0] :
  out[0].a    = MAX src0.1 src0.1 ,
  out[0].rgb  = CMP src0.100 src0.000 src0.r00 ;