bug: cubic or linear volume unhandled

[LurkAndLoiter]

Currently always displays cubic curve of volume which is a non default behavior for Pipewire. (it's from old alsamixer here)

hyprpwcenter/src/pw/PwNode.cpp

Line 142 in 0298787

volumes.at(i) = x;

example currently volume 60% displays as 45%
Display percentage using the cubic curve (≈ perceptual/dB feel):
display_% = pow(linear, 3.0f) × 100
0.60³ ≈ 0.216, display as ~45%

wireplumber/.../modules/module-mixer-api.cL375

static inline gdouble
volume_from_linear (float vol, gint scale)
{
  if (vol <= 0.0f)
    return 0.0;
  else if (scale == SCALE_CUBIC)
    return cbrt(vol);
  else
    return vol;
}

wireplumber/.../modules/module-mixer-api.cL386

static inline float
volume_to_linear (gdouble vol, gint scale)
{
  if (vol <= 0.0f)
    return 0.0;
  else if (scale == SCALE_CUBIC)
    return vol * vol * vol;
  else
    return vol;
}

I'd try to do a PR but I can't compile C++ to save my life. <3