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Document the OpenAL support

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Yamagi Burmeister 2012-04-27 11:52:38 +00:00
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README
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@ -38,10 +38,11 @@ Content of this file:
2.4 Console variables
3. Configuration
3.1 Widescreen setup
3.2 Video
3.3 Input
3.4 Sound
3.1 Video
3.2 Input
3.3 Sound
3.3.1 The classic sound system
3.3.2 The OpenAL sound system
4. Bugreports
@ -338,14 +339,23 @@ There are some cvar to adjust:
3.3 Sound
---------
Quake II featured one of the best sound systems of it's time but sadly it was
totaly broken. Therefore id Software rewrote it once, later it was rewritten
again for the linux port. That fixed the most visible problems, but the code was
just crap and broke again as time passed and sound on PCs evolved.
For Yamagi Quake II 3.0 the sound system was overhauled, featuring a complete
code audit of the upper layers with many bugfixes and memory leak plugs.
The backend was rewritten from scratch. This should solve most if not all
problems.
Quake II featured one of the best sound systems of it's time (for example it had
support for realtime calculated stereo effects) but sadly it was totaly broken.
Therefore id Software rewrote it once, later it was rewritten again for the
linux port. That fixed the most visible problems, but the code was just crap and
broke again as time passed and sound on PCs evolved. For Yamagi Quake II 3.0 the
sound system was overhauled, featuring a complete code audit of the upper layers
with many bugfixes and memory leak plugs. The backend was rewritten from
scratch. This should solve most if not all problems. Yamagi Quake II 4.20
featured an optional OpenAL sound system, enabling better stereo calculations
and even surround support.
3.3.1 The classic sound system
------------------------------
This is the original sound implementation, as used in the first release of Quake
II in 1997. It featured stereo calculations for most samples. It's disabled by
default and can be reenables by setting "s_openal" to "0", followed by
"snd_restart. Common problems are:
- The earthquake sound sample is distorted
This is not a fault of the sound code but of the sound sample itself.
@ -370,6 +380,28 @@ problems.
card 0
}
3.3.2 The OpenAL sound system
-----------------------------
This is a sound system based upon the popular OpenAL audio library. It features
surround playback which gives a huge improvement in sound quality and gameplay
experience. It's enables by default, but can be disabled by setting "s_openal"
to "0", followed by a "snd_restart". To work correctly it's in the need of a
correctly configured OpenAL! OpenAL is configured in the file ~/.alsoftrc (for
the openal-soft implementation, other implementations may vary). The most
important options are:
- channels = surround51 -> Enable 5.1 surround support. Other values are "mono",
"stereo", "quad", "surround61" and "surround71".
- stereodup = true -> If set to "true" all raw stereo samples (in Quake II the
background music and video sounds) are duplicated behind the listener.
Otherwise they're played only through the front speaker.
- resampler = cubic -> Use cubic resampling. While this requires more cpu power
than the default linear resamling it's highly recommended since Quake II has
several hard to resamples sound effects. Especially the earthquake sound can
distort if a low quality resampler is employed!
===============================================================================
4. Bugreports