Query the fading status of a channel.
int which);Mix_Fading Mix_FadingChannel(
the channel to query.
Returns the current fading status of the channel.
This reports one of three values:
If nothing is currently playing on the channel, or an invalid channel is specified, this returns
You may not specify MAX_CHANNEL_POST for a channel.
You may not specify -1 for all channels; only individual channels may be queried.
This function is available since SDL_mixer 2.0.0.