Re: [Super-tux-devel] stereo sound patch. Stereo effect issue

[Duong-Khang N. <neo...@us...>]

> Duong-Khang NGUYEN <neo...@us...> writes:
> > 2. Adds: Stereo sound effects. In "gameloop.c" the kicked laptop now
> > produces stereo sound depending on the position of SuperTux
>
> I don't think that the position of Tux itself should be used for
> calculating the sound position, but instead the center of the
> screen/camera. After all the view of the player and Tux are not really
> the same, even so there are pretty close most of the time.

I don't agree with your opinion since in SuperTux, you have your eyes stuck on 
Tux and it makes sense to calculate the sound panning from the tux's 
position. Just imagine that you have your Tux at the left hand side on the 
screen and there's a bad guy at your right hand side. However since the bad 
guy is in the left half of the screen you play the sound at the left speaker 
(IOW, all the panning effects to the left). The sound let you think that 
there's another bad guy who is coming from the left of Tux whereas the bad 
guy is just there at your right hand side. It will lead to confusion I think.

> > 3. Changes: "play_sound( Mix_Chunk * snd)"
> >      now is "play_sound( Mix_Chunk * snd, enum Sound_Speaker whichSpeaker
> > )" where whichSpeaker is
> >                 SOUND_CENTER_SPEAKER,
> >                 SOUND_LEFT_SPEAKER,
> >                 SOUND_RIGHT_SPEAKER
>
> Why limit the sound to just three enums? Wouldn't it be better to have
> a play_sound(Mix_Chunk* snd, float pos) and thus allow sound to be
> positioned exactly, instead of being one speaker or the other

Why only three enums ? It's because the others are NOT really useful. Here are 
the reasons: the panning effects are simulated by manipulating the left and 
the right channel volumes. If you give the left volume 60% and the right 
volume 40% of the total volume power in order to "position" exactly the 
effects, the sound produced is not that stereo. In addition, with the music 
turned on, you won't be able to distinguish obviously the effects. I've just 
unplugged my laptop from the Home Threater System to test this and the 
effects are nearly unrecognizable.

> (center
> will never be reached, since tux_x won't be equal to bad_guy_x in
> practice)?

Yes, but hardly. I didn't compare "tux_x" and "bad_guy_x" but "tux_x + 
scroll_x" and "bad_guy_x". I think I'll put some toleration or interval for 
the center panning to improve it.

I think you have some confusion between the sound panning effects and the 
sound's attenuation effect. In fact, the sound panning plus the sound's 
attenuation can help simulating the sound position. Currently, there's only 
sound panning implemented. Maybe I'll combine the sound's attenuation effect 
in the near future ...

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