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Set the appropriate meter/unit scale for sound

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This commit is contained in:
Chris Robinson 2017-09-12 15:22:01 -07:00
parent c790fedd3f
commit 0b720cd90c
1 changed files with 15 additions and 0 deletions
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15
apps/openmw/mwsound/openal_output.cpp
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@ -33,6 +33,10 @@
namespace
{
// The game uses 64 units per yard, or approximately 69.99125109 units per meter.
// Should this be defined publically somewhere?
const float UnitsPerMeter = 69.99125109f;
const int sLoudnessFPS = 20; // loudness values per second of audio
// Helper to get an OpenAL extension function
@ -719,7 +723,13 @@ void OpenAL_Output::init(const std::string &devname)
}
LoadEffect(mWaterEffect, EFX_REVERB_PRESET_UNDERWATER);
}
alListenerf(AL_METERS_PER_UNIT, 1.0f / UnitsPerMeter);
}
// Speed of sound is in units per second. Given the default speed of sound is 343.3 (assumed
// meters per second), multiply by the units per meter to get the speed in u/s.
alSpeedOfSound(343.3f * UnitsPerMeter);
alGetError();
mInitialized = true;
}
@ -1246,6 +1256,11 @@ void OpenAL_Output::updateListener(const osg::Vec3f &pos, const osg::Vec3f &atdi
};
alListenerfv(AL_POSITION, pos.ptr());
alListenerfv(AL_ORIENTATION, orient);
if(env != mListenerEnv)
{
// Speed of sound in water is 1484m/s, and in air is 343.3m/s (roughly)
alSpeedOfSound(((env == Env_Underwater) ? 1484.0f : 343.3f) * UnitsPerMeter);
}
throwALerror();
}