- // Right now we make a simplifying assumption that the primary
- // aircraft is the source of all sounds and that all sounds are
- // positioned in the aircraft base
-
- static sgdVec3 last_listener_pos = {0, 0, 0};
- static sgdVec3 last_model_pos = {0, 0, 0};
-
- // get the orientation
- const SGQuatd view_or = current_view->getViewOrientation();
- SGQuatd surf_or = SGQuatd::fromLonLatDeg(
- current_view->getLongitude_deg(), current_view->getLatitude_deg());
- SGQuatd model_or = SGQuatd::fromYawPitchRollDeg(
- globals->get_aircraft_model()->get3DModel()->getHeadingDeg(),
- globals->get_aircraft_model()->get3DModel()->getPitchDeg(),
- globals->get_aircraft_model()->get3DModel()->getRollDeg());
-
- // get the up and at vector in the aircraft base
- // (ok, the up vector is a down vector, but the coordinates
- // are finally calculated in a left hand system and openal
- // lives in a right hand system. Therefore we need to pass
- // the down vector to get correct stereo sound.)
- SGVec3d sgv_up = model_or.rotateBack(
- surf_or.rotateBack(view_or.rotate(SGVec3d(0, 1, 0))));
- sgVec3 up;
- sgSetVec3(up, sgv_up[0], sgv_up[1], sgv_up[2]);
- SGVec3d sgv_at = model_or.rotateBack(
- surf_or.rotateBack(view_or.rotate(SGVec3d(0, 0, 1))));
- sgVec3 at;
- sgSetVec3(at, sgv_at[0], sgv_at[1], sgv_at[2]);
-
- // get the location data for the primary FDM (now hardcoded to ac model)...
- SGLocation *acmodel_loc = NULL;
- acmodel_loc = (SGLocation *)globals->
- get_aircraft_model()->get3DModel()->getSGLocation();
-
- // Calculate speed of listener and model. This code assumes the
- // listener is either tracking the model at the same speed or
- // stationary.
-
- sgVec3 listener_vel, model_vel;
- SGVec3d SGV3d_help;
- sgdVec3 sgdv3_help;
- sgdVec3 sgdv3_null = {0, 0, 0};
-
- // the aircraft velocity as reported by the fdm (this will not
- // vary or be affected by frame rates or timing jitter.)
- sgVec3 fdm_vel_vec;
- sgSetVec3( fdm_vel_vec,
- vn_fps->getDoubleValue() * SG_FEET_TO_METER,
- ve_fps->getDoubleValue() * SG_FEET_TO_METER,
- vd_fps->getDoubleValue() * SG_FEET_TO_METER );
- double fdm_vel = sgLengthVec3(fdm_vel_vec);
-
- // compute the aircraft velocity vector and scale it to the length
- // of the fdm velocity vector. This gives us a vector in the
- // proper coordinate system, but also with the proper time
- // invariant magnitude.
- sgdSubVec3( sgdv3_help,
- last_model_pos, acmodel_loc->get_absolute_view_pos());
- sgdAddVec3( last_model_pos, sgdv3_null, acmodel_loc->get_absolute_view_pos());
- SGV3d_help = model_or.rotateBack(
- surf_or.rotateBack(SGVec3d(sgdv3_help[0],
- sgdv3_help[1], sgdv3_help[2])));
- sgSetVec3( model_vel, SGV3d_help[0], SGV3d_help[1], SGV3d_help[2]);
-
- float vel = sgLengthVec3(model_vel);
- if ( fabs(vel) > 0.0001 ) {
- if ( fabs(fdm_vel / vel) > 0.0001 ) {
- sgScaleVec3( model_vel, fdm_vel / vel );
- }
- }
-
- // check for moving or stationary listener (view position)
- sgdSubVec3( sgdv3_help,
- last_listener_pos, (double *)¤t_view->get_view_pos());
- sgdAddVec3( last_listener_pos,
- sgdv3_null, (double *)¤t_view->get_view_pos());
-
- if ( sgdLengthVec3(sgdv3_help) > 0.2 ) {
- sgCopyVec3( listener_vel, model_vel );