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Expose the ability to specify how the sound volume fades relative to

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distance from the listener.  This let's us configure "interior" cockpit
sounds versus "exterior" engine type sounds.
This commit is contained in:
curt
2004-04-28 03:57:13 +00:00
parent edd92caba1
commit 7d239fe4ac
3 changed files with 39 additions and 3 deletions
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12
simgear/sound/sample_openal.cxx
View File

@@ -66,6 +66,8 @@ SGSoundSample::SGSoundSample( const char *path, const char *file,
data(NULL),
pitch(1.0),
volume(1.0),
reference_dist(500.0),
max_dist(3000.),
loop(AL_FALSE)
{
SGPath samplepath( path );
@@ -131,8 +133,8 @@ SGSoundSample::SGSoundSample( const char *path, const char *file,
alSourcei( source, AL_LOOPING, loop );
alSourcei( source, AL_SOURCE_RELATIVE, AL_TRUE );
alSourcef( source, AL_REFERENCE_DISTANCE, 500.0f );
alSourcef( source, AL_MAX_DISTANCE, 3000.0f );
alSourcef( source, AL_REFERENCE_DISTANCE, reference_dist );
alSourcef( source, AL_MAX_DISTANCE, max_dist );
}
@@ -141,6 +143,8 @@ SGSoundSample::SGSoundSample( unsigned char *_data, int len, int _freq ) :
data(NULL),
pitch(1.0),
volume(1.0),
reference_dist(500.0),
max_dist(3000.),
loop(AL_FALSE)
{
SG_LOG( SG_GENERAL, SG_DEBUG, "In memory sounds sample" );
@@ -176,6 +180,10 @@ SGSoundSample::SGSoundSample( unsigned char *_data, int len, int _freq ) :
alSourcefv( source, AL_POSITION, source_pos );
alSourcefv( source, AL_VELOCITY, source_vel );
alSourcei( source, AL_LOOPING, loop );
alSourcei( source, AL_SOURCE_RELATIVE, AL_TRUE );
alSourcef( source, AL_REFERENCE_DISTANCE, reference_dist );
alSourcef( source, AL_MAX_DISTANCE, max_dist );
}

21
simgear/sound/sample_openal.hxx
View File

@@ -81,6 +81,8 @@ private:
double pitch;
double volume;
double reference_dist;
double max_dist;
ALboolean loop;
public:
@@ -210,6 +212,25 @@ public:
alSourcefv( source, AL_VELOCITY, source_vel );
}
/**
* Set reference distance of sound (the distance where the gain
* will be half.)
*/
inline void set_reference_dist( ALfloat dist ) {
reference_dist = dist;
alSourcef( source, AL_REFERENCE_DISTANCE, reference_dist );
}
/**
* Set maximume distance of sound (the distance where the sound is
* no longer audible.
*/
inline void set_max_dist( ALfloat dist ) {
max_dist = dist;
alSourcef( source, AL_MAX_DISTANCE, max_dist );
}
};

9
simgear/sound/xmlsound.cxx
View File

@@ -180,7 +180,11 @@ SGXmlSound::init(SGPropertyNode *root, SGPropertyNode *node, SGSoundMgr *sndmgr,
}
float reference_dist = node->getDoubleValue("reference-dist", 500.0);
float max_dist = node->getDoubleValue("max-dist", 3000.0);
SG_LOG(SG_GENERAL,SG_ALERT, "ref-dist = " << reference_dist );
SG_LOG(SG_GENERAL,SG_ALERT, "max-dist = " << max_dist );
//
// set pitch properties
//
@@ -241,10 +245,13 @@ SGXmlSound::init(SGPropertyNode *root, SGPropertyNode *node, SGSoundMgr *sndmgr,
_sample = new SGSoundSample( path.c_str(),
node->getStringValue("path", ""),
true );
_mgr->add( _sample, _name );
}
_sample->set_volume(v);
_sample->set_reference_dist( reference_dist );
_sample->set_max_dist( max_dist );
_sample->set_pitch(p);
}