Small code reorganization, mostly removing unneeded code

simgear/sound/sample_group.cxx

@@ -42,8 +42,6 @@ SGSampleGroup::SGSampleGroup () :
     _tied_to_listener(false),
     _velocity(SGVec3d::zeros()),
     _orientation(SGQuatd::zeros()),
-    _position(SGVec3d::zeros()),
-    _pos_offs(SGVec3d::zeros()),
     _position_geod(SGGeod())
 {
     _samples.clear();
@@ -58,8 +56,6 @@ SGSampleGroup::SGSampleGroup ( SGSoundMgr *smgr, const string &refname ) :
     _tied_to_listener(false),
     _velocity(SGVec3d::zeros()),
     _orientation(SGQuatd::zeros()),
-    _position(SGVec3d::zeros()),
-    _pos_offs(SGVec3d::zeros()),
     _position_geod(SGGeod())
 {
     _smgr->add(this, refname);
@@ -344,19 +340,6 @@ void SGSampleGroup::update_pos_and_orientation() {
     SGVec3d position = SGVec3d::fromGeod( _position_geod );
     SGVec3d pos_offs = SGVec3d::fromGeod( _smgr->get_position_geod() );
 
-    if (_position != position || _pos_offs != pos_offs) {
-        _position = position;
-        _pos_offs = pos_offs;
-
-        sample_map_iterator sample_current = _samples.begin();
-        sample_map_iterator sample_end = _samples.end();
-        for ( ; sample_current != sample_end; ++sample_current ) {
-            SGSoundSample *sample = sample_current->second;
-            sample->set_position( _position );
-            sample->set_position_offset( _pos_offs );
-        }
-    }
-
     // The rotation rotating from the earth centerd frame to
     // the horizontal local frame
     SGQuatd hlOr = SGQuatd::fromLonLat(_position_geod);
@@ -373,6 +356,7 @@ void SGSampleGroup::update_pos_and_orientation() {
     sample_map_iterator sample_end = _samples.end();
     for ( ; sample_current != sample_end; ++sample_current ) {
         SGSoundSample *sample = sample_current->second;
+        sample->set_position( position - pos_offs );
         sample->set_orientation( _orientation );
         sample->set_rotation( sc2body );
     }

simgear/sound/sample_group.hxx

@@ -226,9 +226,6 @@ private:
 
     SGVec3f _velocity;
     SGQuatd _orientation;
-    SGVec3d _position;
-    SGVec3d _pos_offs;
-
     SGGeod _position_geod;
 
     sample_map _samples;

simgear/sound/sample_openal.cxx

@@ -51,7 +51,6 @@ SGSoundSample::SGSoundSample() :
     _rotation(SGQuatd::zeros()),
     _orivec(SGVec3f::zeros()),
     _base_pos(SGVec3d::zeros()),
-    _base_offs(SGVec3d::zeros()),
     _refname(random_string()),
     _data(NULL),
     _format(AL_FORMAT_MONO8),
@@ -87,7 +86,6 @@ SGSoundSample::SGSoundSample( const char *path, const char *file ) :
     _rotation(SGQuatd::zeros()),
     _orivec(SGVec3f::zeros()),
     _base_pos(SGVec3d::zeros()),
-    _base_offs(SGVec3d::zeros()),
     _refname(file),
     _data(NULL),
     _format(AL_FORMAT_MONO8),
@@ -129,7 +127,6 @@ SGSoundSample::SGSoundSample( const unsigned char** data,
     _rotation(SGQuatd::zeros()),
     _orivec(SGVec3f::zeros()),
     _base_pos(SGVec3d::zeros()),
-    _base_offs(SGVec3d::zeros()),
     _refname(random_string()),
     _format(format),
     _size(len),
@@ -166,7 +163,6 @@ SGSoundSample::SGSoundSample( void** data, int len, int freq, int format ) :
     _rotation(SGQuatd::zeros()),
     _orivec(SGVec3f::zeros()),
     _base_pos(SGVec3d::zeros()),
-    _base_offs(SGVec3d::zeros()),
     _refname(random_string()),
     _format(format),
     _size(len),
@@ -201,7 +197,7 @@ SGSoundSample::~SGSoundSample() {
 
 void SGSoundSample::update_pos_and_orientation() {
 
-    _absolute_pos = _base_pos - _base_offs;
+    _absolute_pos = _base_pos;
     if ( _relative_pos[0] || _relative_pos[1] || _relative_pos[2] ) {
         _absolute_pos += _rotation.backTransform(_relative_pos);
     }

simgear/sound/sample_openal.hxx

@@ -322,14 +322,6 @@ public:
        _base_pos = pos; _changed = true;
     }
 
-    /**
-     * Set the base position offset in Cartesian coordinates
-     * @param offs offset in Cartesian coordinates
-     */
-    inline void set_position_offset( const SGVec3d& offs ) {
-       _base_offs = offs; _changed = true;
-    }
-
     /**
      * Get the absolute position of this sound.
      * This is in the same coordinate system as OpenGL; y=up, z=back, x=right.
@@ -472,7 +464,6 @@ private:
     SGQuatd _rotation;		// rotation vector for relative offsets
     SGVec3f _orivec;		// orientation vector for OpenAL
     SGVec3d _base_pos;		// base position
-    SGVec3d _base_offs;		// base offset position
 
     std::string _refname;	// name or file path
     unsigned char* _data;