float calcRoundedCorners() {
    if (radius <= 0.0) {
        return 1.0;
    }
    vec2 pixelPos = pass_textureCoords * vec2(uiWidth, uiHeight);
    vec2 minCorner = vec2(radius, radius);
    vec2 maxCorner = vec2(uiWidth - radius, uiHeight - radius);

    vec2 cornerPoint = clamp(pixelPos, minCorner, maxCorner);
    float lowerBound = square(radius - cornerSmoothFactor);
    float upperBound = square(radius + cornerSmoothFactor);
    return smoothstep(upperBound, lowerBound, distanceSquared(pixelPos, cornerPoint));
}