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Fade in the sound exponentially at startup

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This commit is contained in:
Erik Hofman 2017-01-12 15:06:04 +01:00
parent 88fc98f57b
commit ed4a9337d9
2 changed files with 10 additions and 2 deletions
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11
src/Sound/soundmanager.cxx
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@ -59,7 +59,8 @@ void Listener::valueChanged(SGPropertyNode * node)
} }
FGSoundManager::FGSoundManager() FGSoundManager::FGSoundManager()
: _is_initialized(false), : _active_dt(0.0),
_is_initialized(false),
_enabled(false), _enabled(false),
_listener(new Listener(this)) _listener(new Listener(this))
{ {
@ -189,7 +190,13 @@ void FGSoundManager::update(double dt)
set_velocity( velocity ); set_velocity( velocity );
set_volume(_volume->getFloatValue()); float vf = 1.0f;
if (_active_dt < 5.0) {
_active_dt += dt;
vf = std::min(std::pow(_active_dt*0.2, 5.0), 1.0);
}
set_volume(vf*_volume->getFloatValue());
SGSoundMgr::update(dt); SGSoundMgr::update(dt);
} }
} }

1
src/Sound/soundmanager.hxx
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@ -57,6 +57,7 @@ private:
SGSharedPtr<FGSampleQueue> _chatterQueue; SGSharedPtr<FGSampleQueue> _chatterQueue;
double _active_dt;
bool _is_initialized, _enabled; bool _is_initialized, _enabled;
SGPropertyNode_ptr _sound_working, _sound_enabled, _volume, _device_name; SGPropertyNode_ptr _sound_working, _sound_enabled, _volume, _device_name;
SGPropertyNode_ptr _velocityNorthFPS, _velocityEastFPS, _velocityDownFPS; SGPropertyNode_ptr _velocityNorthFPS, _velocityEastFPS, _velocityDownFPS;