shader basic_shader(
    float in_float = 1.0,
    color in_color = color(1.0, 1.0, 1.0),
    output float out_float = 0.0,
    output color out_color = color(0.0, 0.0, 0.0)
    )
{
    out_float = in_float * 2.0;
    out_color = in_color * 2.0;
}