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Code Issues 123 Wiki Activity

build 171205. support for random sound sets, explicit range-driven sound attenuation

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This commit is contained in:
tmj-fstate
2017-12-05 19:51:36 +01:00
parent 4f9464499c
commit 807eecd482
7 changed files with 135 additions and 79 deletions
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22
audiorenderer.cpp
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@@ -100,7 +100,7 @@ openal_source::sync_with( sound_properties const &State ) {
auto const cutoffrange = (
is_multipart ?
EU07_SOUND_CUTOFFRANGE : // we keep multi-part sounds around longer, to minimize restarts as the sounds get out and back in range
sound_range * 7.5f );
sound_range * 5.0f );
if( glm::length2( sound_distance ) > std::min( ( cutoffrange * cutoffrange ), ( EU07_SOUND_CUTOFFRANGE * EU07_SOUND_CUTOFFRANGE ) ) ) {
stop();
is_synced = false; // flag sync failure for the controller
@@ -124,6 +124,24 @@ openal_source::sync_with( sound_properties const &State ) {
::alSourcef( id, AL_GAIN, properties.gain * properties.soundproofing * Global::AudioVolume );
}
if( sound_range > 0 ) {
auto const rangesquared { sound_range * sound_range };
auto const distancesquared { glm::length2( sound_distance ) };
if( ( distancesquared > rangesquared )
|| ( false == is_in_range ) ) {
// if the emitter is outside of its nominal hearing range or was outside of it during last check
// adjust the volume to a suitable fraction of nominal value
auto const fadedistance { sound_range * 0.75 };
auto const rangefactor {
interpolate(
1.f, 0.f,
clamp<float>(
( distancesquared - rangesquared ) / ( fadedistance * fadedistance ),
0.f, 1.f ) ) };
::alSourcef( id, AL_GAIN, properties.gain * properties.soundproofing * rangefactor * Global::AudioVolume );
}
is_in_range = ( distancesquared <= rangesquared );
}
// pitch
if( State.pitch != properties.pitch ) {
// pitch value has changed
@@ -148,7 +166,7 @@ openal_source::range( float const Range ) {
Range :
5 ) }; // range of -1 means sound of unlimited range, positioned at the listener
::alSourcef( id, AL_REFERENCE_DISTANCE, range * ( 1.f / 16.f ) );
::alSourcef( id, AL_ROLLOFF_FACTOR, 1.5f );
::alSourcef( id, AL_ROLLOFF_FACTOR, 1.75f );
}
// sets modifier applied to the pitch of sounds emitted by the source