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Code Issues 123 Wiki Activity

build 171202. audio subsystem: volume support, source reassignment, bug fixes

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This commit is contained in:
tmj-fstate
2017-12-03 02:35:49 +01:00
parent 0f0cb4209b
commit 5645c13362
11 changed files with 122 additions and 58 deletions
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59
audiorenderer.cpp
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@@ -94,18 +94,21 @@ openal_source::sync_with( sound_properties const &State ) {
*/
// location
properties.location = State.location;
auto sourceoffset { glm::vec3 { properties.location - glm::dvec3 { Global::pCameraPosition } } };
sound_distance = properties.location - glm::dvec3 { Global::pCameraPosition };
if( sound_range > 0 ) {
// range cutoff check
auto const cutoffrange { sound_range * 7.5f };
if( glm::length2( sourceoffset ) > std::min( ( cutoffrange * cutoffrange ), ( EU07_SOUND_CUTOFFRANGE * EU07_SOUND_CUTOFFRANGE ) ) ) {
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 );
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
return;
}
}
if( sound_range >= 0 ) {
::alSourcefv( id, AL_POSITION, glm::value_ptr( sourceoffset ) );
::alSourcefv( id, AL_POSITION, glm::value_ptr( sound_distance ) );
}
else {
// sounds with 'unlimited' range are positioned on top of the listener
@@ -233,6 +236,7 @@ openal_renderer::init() {
//
// ::alDistanceModel( AL_LINEAR_DISTANCE );
::alDistanceModel( AL_INVERSE_DISTANCE_CLAMPED );
::alListenerf( AL_GAIN, clamp( Global::AudioVolume, 1.f, 4.f ) );
// all done
m_ready = true;
return true;
@@ -315,13 +319,54 @@ openal_renderer::update( double const Deltatime ) {
audio::openal_source
openal_renderer::fetch_source() {
audio::openal_source soundsource;
audio::openal_source newsource;
if( false == m_sourcespares.empty() ) {
// reuse (a copy of) already allocated source
soundsource.id = m_sourcespares.top();
newsource.id = m_sourcespares.top();
m_sourcespares.pop();
}
return soundsource;
if( newsource.id == audio::null_resource ) {
// if there's no source to reuse, try to generate a new one
::alGenSources( 1, &( newsource.id ) );
}
if( newsource.id == audio::null_resource ) {
// if we still don't have a working source, see if we can sacrifice an already active one
// under presumption it's more important to play new sounds than keep the old ones going
// TBD, TODO: for better results we could use range and/or position for the new sound
// to better weight whether the new sound is really more important
auto leastimportantsource { std::end( m_sources ) };
auto leastimportantweight { std::numeric_limits<float>::max() };
for( auto source { std::begin( m_sources ) }; source != std::cend( m_sources ); ++source ) {
if( ( source->id == audio::null_resource )
|| ( true == source->is_multipart )
|| ( false == source->is_playing ) ) {
continue;
}
auto const sourceweight { (
source->sound_range > 0 ?
( source->sound_range * source->sound_range ) / ( glm::length2( source->sound_distance ) + 1 ) :
std::numeric_limits<float>::max() ) };
if( sourceweight < leastimportantweight ) {
leastimportantsource = source;
leastimportantweight = sourceweight;
}
}
if( ( leastimportantsource != std::end( m_sources ) )
&& ( leastimportantweight < 1.f ) ) {
// only accept the candidate if it's outside of its nominal hearing range
leastimportantsource->stop();
leastimportantsource->update( 0 ); // HACK: a roundabout way to notify the controller its emitter has stopped
leastimportantsource->clear();
// we should be now free to grab the id and get rid of the remains
newsource.id = leastimportantsource->id;
m_sources.erase( leastimportantsource );
}
}
return newsource;
}
bool