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Add Pan to Audio Source for stereo panning

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This commit is contained in:
Wojtek Figat
2023-04-21 15:58:22 +02:00
parent eb613d3e8a
commit 8457687025
9 changed files with 82 additions and 1 deletions
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20
Source/Engine/Audio/OpenAL/AudioBackendOAL.cpp
View File

@@ -164,6 +164,11 @@ namespace ALC
alSource3f(sourceID, AL_POSITION, 0.0f, 0.0f, 0.0f);
alSource3f(sourceID, AL_VELOCITY, 0.0f, 0.0f, 0.0f);
}
#ifdef AL_EXT_STEREO_ANGLES
const float panAngle = source->GetPan() * PI_HALF;
const ALfloat panAngles[2] = { (ALfloat)(PI / 6.0 - panAngle), (ALfloat)(-PI / 6.0 - panAngle) }; // Angles are specified counter-clockwise in radians
alSourcefv(sourceID, AL_STEREO_ANGLES, panAngles);
#endif
}
// Restore state after Cleanup
@@ -392,6 +397,18 @@ void AudioBackendOAL::Source_PitchChanged(AudioSource* source)
}
}
void AudioBackendOAL::Source_PanChanged(AudioSource* source)
{
#ifdef AL_EXT_STEREO_ANGLES
const float panAngle = source->GetPan() * PI_HALF;
const ALfloat panAngles[2] = { (ALfloat)(PI / 6.0 - panAngle), (ALfloat)(-PI / 6.0 - panAngle) }; // Angles are specified counter-clockwise in radians
ALC_FOR_EACH_CONTEXT()
const uint32 sourceID = source->SourceIDs[i];
alSourcefv(sourceID, AL_STEREO_ANGLES, panAngles);
}
#endif
}
void AudioBackendOAL::Source_IsLoopingChanged(AudioSource* source)
{
const bool loop = source->GetIsLooping() && !source->UseStreaming();
@@ -409,6 +426,9 @@ void AudioBackendOAL::Source_SpatialSetupChanged(AudioSource* source)
alSourcei(sourceID, AL_SOURCE_RELATIVE, !is3D);
if (is3D)
{
#ifdef AL_SOFT_source_spatialize
alSourcei(sourceID, AL_SOURCE_SPATIALIZE_SOFT, AL_TRUE);
#endif
alSourcef(sourceID, AL_ROLLOFF_FACTOR, source->GetAttenuation());
alSourcef(sourceID, AL_DOPPLER_FACTOR, source->GetDopplerFactor());
alSourcef(sourceID, AL_REFERENCE_DISTANCE, FLAX_DST_TO_OAL(source->GetMinDistance()));

1
Source/Engine/Audio/OpenAL/AudioBackendOAL.h
View File

@@ -25,6 +25,7 @@ public:
void Source_TransformChanged(AudioSource* source) override;
void Source_VolumeChanged(AudioSource* source) override;
void Source_PitchChanged(AudioSource* source) override;
void Source_PanChanged(AudioSource* source) override;
void Source_IsLoopingChanged(AudioSource* source) override;
void Source_SpatialSetupChanged(AudioSource* source) override;
void Source_ClipLoaded(AudioSource* source) override;