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

[Tobias <tob...@gm...>]

I agree with all Duong-Khang said. :)
Why? The results convinced me. ;) That's real stereo man.

Greetz...

Tobias Gläßer ( And no, I haven't a Home Threater System :( *cry )

Am So, den 28.12.2003 schrieb Duong-Khang NGUYEN um 19:01:
> > 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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