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Fix speed of sound and unit scale

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This commit is contained in:
Chris Robinson 2017-09-25 05:32:04 -07:00 committed by Christoph Oelckers
parent e71e4b6dc8
commit bbaec90f61
1 changed files with 12 additions and 2 deletions
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14
src/sound/oalsound.cpp
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@ -273,6 +273,7 @@ class OpenALSoundStream : public SoundStream
alSourcef(Source, AL_MAX_GAIN, 1.f);
alSourcef(Source, AL_GAIN, 1.f);
alSourcef(Source, AL_PITCH, 1.f);
alSourcef(Source, AL_DOPPLER_FACTOR, 0.f);
alSourcef(Source, AL_ROLLOFF_FACTOR, 0.f);
alSourcef(Source, AL_SEC_OFFSET, 0.f);
alSourcei(Source, AL_SOURCE_RELATIVE, AL_TRUE);
@ -821,8 +822,15 @@ OpenALSoundRenderer::OpenALSoundRenderer()
AL.SOFT_source_resampler = !!alIsExtensionPresent("AL_SOFT_source_resampler");
AL.SOFT_source_spatialize = !!alIsExtensionPresent("AL_SOFT_source_spatialize");
alDopplerFactor(0.5f);
alSpeedOfSound(343.3f * 96.0f);
// Speed of sound is in units per second. Presuming we want to simulate a
// typical speed of sound of 343.3 meters per second, multiply it by the
// units per meter scale (32?), and set the meters per unit to the scale's
// reciprocal. It's important to set these correctly for both doppler
// effects and reverb.
alSpeedOfSound(343.3f * 32.0f);
if(ALC.EXT_EFX)
alListenerf(AL_METERS_PER_UNIT, 1.0f/32.0f);
alDistanceModel(AL_INVERSE_DISTANCE);
if(AL.EXT_source_distance_model)
alEnable(AL_SOURCE_DISTANCE_MODEL);
@ -1568,6 +1576,7 @@ FISoundChannel *OpenALSoundRenderer::StartSound(SoundHandle sfx, float vol, int
alSourcef(source, AL_REFERENCE_DISTANCE, 1.f);
alSourcef(source, AL_MAX_DISTANCE, 1000.f);
alSourcef(source, AL_DOPPLER_FACTOR, 0.f);
alSourcef(source, AL_ROLLOFF_FACTOR, 0.f);
alSourcef(source, AL_MAX_GAIN, SfxVolume);
alSourcef(source, AL_GAIN, SfxVolume*vol);
@ -1778,6 +1787,7 @@ FISoundChannel *OpenALSoundRenderer::StartSound3D(SoundHandle sfx, SoundListener
}
alSource3f(source, AL_VELOCITY, vel[0], vel[1], -vel[2]);
alSource3f(source, AL_DIRECTION, 0.f, 0.f, 0.f);
alSourcef(source, AL_DOPPLER_FACTOR, 0.f);
alSourcei(source, AL_LOOPING, (chanflags&SNDF_LOOP) ? AL_TRUE : AL_FALSE);