declare var _default: "uniform float outlineExpand;\nuniform float outlineStep;\nuniform vec3  outlineColor;\n\nvarying float vPixelSize;\n\nconst float PIXEL_STEP = 255.0 / 16.0;\n\nvec4 getLabelOutlineColor(vec4 color, vec4 sample) {\n  float ps = vPixelSize * PIXEL_STEP;\n  float os = outlineStep;\n\n  float sdf = sample.r - .5 + outlineExpand;\n  vec2  sdfs = vec2(sdf, sdf + os);\n  vec2  alpha = clamp(sdfs * ps + .5, 0.0, 1.0);\n\n  if (alpha.y <= 0.0) {\n    discard;\n  }\n\n  vec3 blend = color.xyz;\n  if (alpha.y > alpha.x) {\n    blend = sqrt(mix(outlineColor * outlineColor, blend * blend, alpha.x));\n  }\n  \n  return vec4(blend, alpha.y * color.a);\n}\n";
export default _default;