X-Git-Url: https://git.mxchange.org/?a=blobdiff_plain;f=src%2FMain%2Fmain.cxx;h=8c64afae12ef6a81e6590d292b4f6f2bae48edad;hb=93c6d15e194370c67b4d91ef58492002b78049b5;hp=ecc0b88acded1a597c0c6f194bbde37ec2f130eb;hpb=183b871b483c153d3b55f68948b91179a62e232f;p=flightgear.git

diff --git a/src/Main/main.cxx b/src/Main/main.cxx
index ecc0b88ac..07c10598a 100644
--- a/src/Main/main.cxx
+++ b/src/Main/main.cxx
@@ -41,12 +41,12 @@
 #include <osgDB/Registry>
 
 // Class references
-#include <simgear/ephemeris/ephemeris.hxx>
 #include <simgear/scene/model/modellib.hxx>
 #include <simgear/scene/material/matlib.hxx>
 #include <simgear/scene/model/animation.hxx>
 #include <simgear/scene/sky/sky.hxx>
 #include <simgear/structure/event_mgr.hxx>
+#include <simgear/props/AtomicChangeListener.hxx>
 #include <simgear/props/props.hxx>
 #include <simgear/timing/sg_time.hxx>
 #include <simgear/math/sg_random.h>
@@ -61,13 +61,15 @@
 #include <Model/acmodel.hxx>
 #include <Scenery/scenery.hxx>
 #include <Scenery/tilemgr.hxx>
+#include <Sound/fg_fx.hxx>
 #include <Sound/beacon.hxx>
 #include <Sound/morse.hxx>
-#include <FDM/flight.hxx>
+#include <Sound/fg_fx.hxx>
 #include <ATCDCL/ATCmgr.hxx>
 #include <ATCDCL/AIMgr.hxx>
 #include <Time/tmp.hxx>
 #include <Environment/environment_mgr.hxx>
+#include <Environment/ephemeris.hxx>
 #include <GUI/new_gui.hxx>
 #include <MultiPlayer/multiplaymgr.hxx>
 
@@ -79,12 +81,12 @@
 #include "main.hxx"
 #include "util.hxx"
 #include "fg_init.hxx"
+#include "fg_os.hxx"
 #include "WindowSystemAdapter.hxx"
-
+#include <Main/viewer.hxx>
 
 static double real_delta_time_sec = 0.0;
 double delta_time_sec = 0.0;
-extern float init_volume;
 
 using namespace flightgear;
 
@@ -102,91 +104,13 @@ long global_multi_loop;
 SGTimeStamp last_time_stamp;
 SGTimeStamp current_time_stamp;
 
+void fgInitSoundManager();
+void fgSetNewSoundDevice(const char *);
+
 // The atexit() function handler should know when the graphical subsystem
 // is initialized.
 extern int _bootstrap_OSInit;
 
-
-
-// Update internal time dependent calculations (i.e. flight model)
-// FIXME: this distinction is obsolete; all subsystems now get delta
-// time on update.
-void fgUpdateTimeDepCalcs() {
-    static bool inited = false;
-
-    static const SGPropertyNode *replay_state
-        = fgGetNode( "/sim/freeze/replay-state", true );
-    static SGPropertyNode *replay_time
-        = fgGetNode( "/sim/replay/time", true );
-    // static const SGPropertyNode *replay_end_time
-    //     = fgGetNode( "/sim/replay/end-time", true );
-
-    //SG_LOG(SG_FLIGHT,SG_INFO, "Updating time dep calcs()");
-
-    // Initialize the FDM here if it hasn't been and if we have a
-    // scenery elevation hit.
-
-    // cout << "cur_fdm_state->get_inited() = " << cur_fdm_state->get_inited() 
-    //      << " cur_elev = " << scenery.get_cur_elev() << endl;
-
-    if (!cur_fdm_state->get_inited()) {
-        // Check for scenery around the aircraft.
-        double lon = fgGetDouble("/sim/presets/longitude-deg");
-        double lat = fgGetDouble("/sim/presets/latitude-deg");
-        // We require just to have 50 meter scenery availabe around
-        // the aircraft.
-        double range = 1000.0;
-        SGGeod geod = SGGeod::fromDeg(lon, lat);
-        if (globals->get_scenery()->scenery_available(geod, range)) {
-            //SG_LOG(SG_FLIGHT, SG_INFO, "Finally initializing fdm");
-            cur_fdm_state->init();
-            if ( cur_fdm_state->get_bound() ) {
-                cur_fdm_state->unbind();
-            }
-            cur_fdm_state->bind();
-        }
-    }
-
-    // conceptually, the following block could be done for each fdm
-    // instance ...
-    if ( cur_fdm_state->get_inited() ) {
-        // we have been inited, and  we are good to go ...
-
-        if ( replay_state->getIntValue() == 0 ) {
-            // replay off, run fdm
-            cur_fdm_state->update( delta_time_sec );
-        } else {
-            FGReplay *r = (FGReplay *)(globals->get_subsystem( "replay" ));
-            r->replay( replay_time->getDoubleValue() );
-            if ( replay_state->getIntValue() == 1 ) {
-                // normal playback
-                replay_time->setDoubleValue( replay_time->getDoubleValue()
-                                             + ( delta_time_sec
-                                               * fgGetInt("/sim/speed-up") ) );
-            } else if ( replay_state->getIntValue() == 2 ) {
-                // paused playback (don't advance replay time)
-            }
-        }
-
-        if ( !inited ) {
-            inited = true;
-            fgSetBool("/sim/signals/fdm-initialized", true);
-        }
-
-    } else {
-        // do nothing, fdm isn't inited yet
-    }
-
-    globals->get_aircraft_model()->update(delta_time_sec);
-
-    // Update solar system
-    globals->get_ephem()->update( globals->get_time_params()->getMjd(),
-                                  globals->get_time_params()->getLst(),
-                                  cur_fdm_state->get_Latitude() );
-
-}
-
-
 // What should we do when we have nothing else to do?  Let's get ready
 // for the next move and update the display?
 static void fgMainLoop( void ) {
@@ -301,6 +225,10 @@ static void fgMainLoop( void ) {
     if (0 < dtMax && dtMax < real_delta_time_sec)
         real_delta_time_sec = dtMax;
 
+    SGSubsystemGroup* fdmGroup = 
+      globals->get_subsystem_mgr()->get_group(SGSubsystemMgr::FDM);
+    fdmGroup->set_fixed_update_time(1.0 / model_hz);
+
     // round the real time down to a multiple of 1/model-hz.
     // this way all systems are updated the _same_ amount of dt.
     static double reminder = 0.0;
@@ -335,21 +263,6 @@ static void fgMainLoop( void ) {
     SG_LOG( SG_ALL, SG_DEBUG, "Running Main Loop");
     SG_LOG( SG_ALL, SG_DEBUG, "======= ==== ====");
 
-    // Fix elevation.  I'm just sticking this here for now, it should
-    // probably move eventually
-
-    /* printf("Before - ground = %.2f  runway = %.2f  alt = %.2f\n",
-           scenery.get_cur_elev(),
-           cur_fdm_state->get_Runway_altitude() * SG_FEET_TO_METER,
-           cur_fdm_state->get_Altitude() * SG_FEET_TO_METER); */
-
-    /* printf("Adjustment - ground = %.2f  runway = %.2f  alt = %.2f\n",
-           scenery.get_cur_elev(),
-           cur_fdm_state->get_Runway_altitude() * SG_FEET_TO_METER,
-           cur_fdm_state->get_Altitude() * SG_FEET_TO_METER); */
-
-    // cout << "Warp = " << globals->get_warp() << endl;
-
     // update "time"
     static bool last_clock_freeze = false;
 
@@ -418,7 +331,7 @@ static void fgMainLoop( void ) {
         general.set_frame_rate( frames );
         fgSetInt("/sim/frame-rate", frames);
         SG_LOG( SG_ALL, SG_DEBUG,
-            "--> Frame rate is = " << general.get_frame_rate() );
+                "--> Frame rate is = " << general.get_frame_rate() );
         frames = 0;
     }
     last_time = t->get_cur_time();
@@ -429,45 +342,34 @@ static void fgMainLoop( void ) {
     // implementation is an AI model and depends on that
     globals->get_multiplayer_mgr()->Update();
 
+#if ENABLE_ATCDCL
     // Run ATC subsystem
     if (fgGetBool("/sim/atc/enabled"))
         globals->get_ATC_mgr()->update(delta_time_sec);
 
+
     // Run the AI subsystem
-    // FIXME: run that also if we have multiplaying enabled since the
-    // multiplayer information is interpreted by an AI model
+    // NOTE: the AI_mgr has nothing to do with the AIModels subsystem.
+    // There was previously a comment here stating that the
+    // AI_mgr code should be run then multiplayer is enabled.
+    // Multiplayer relies on AIModels, and not on the old and
+    // depricated AI_mgr system. So, we can safely skip the following
+    // two lines at compile time when compiling with --disable-atcdcl
     if (fgGetBool("/sim/ai-traffic/enabled"))
         globals->get_AI_mgr()->update(delta_time_sec);
-
-    // Run flight model
-    if (0 < global_multi_loop) {
-        // first run the flight model each frame until it is initialized
-        // then continue running each frame only after initial scenery
-        // load is complete.
-        fgUpdateTimeDepCalcs();
-    } else {
-        SG_LOG( SG_ALL, SG_DEBUG,
-            "Elapsed time is zero ... we're zinging" );
-    }
-
-    // Run audio scheduler
-#ifdef ENABLE_AUDIO_SUPPORT
-    if ( globals->get_soundmgr()->is_working() ) {
-        globals->get_soundmgr()->update( delta_time_sec );
-    }
-#endif
-
+#endif  
+    
     globals->get_subsystem_mgr()->update(delta_time_sec);
-
+    globals->get_aircraft_model()->update(delta_time_sec);
+    
     //
     // Tile Manager updates - see if we need to load any new scenery tiles.
     //   this code ties together the fdm, viewer and scenery classes...
     //   we may want to move this to its own class at some point
     //
     double visibility_meters = fgGetDouble("/environment/visibility-m");
-    FGViewer *current_view = globals->get_current_view();
-
     globals->get_tile_mgr()->prep_ssg_nodes( visibility_meters );
+
     // update tile manager for view...
     SGVec3d viewPos = globals->get_current_view()->get_view_pos();
     SGGeod geodViewPos = SGGeod::fromCart(viewPos);
@@ -481,143 +383,87 @@ static void fgMainLoop( void ) {
     globals->get_model_mgr()->update(delta_time_sec);
 
     // update the view angle as late as possible, but before sound calculations
-    globals->get_viewmgr()->update(delta_time_sec);
-
-    // Do any I/O channel work that might need to be done (must come after viewmgr)
-    globals->get_io()->update(real_delta_time_sec);
+    globals->get_viewmgr()->update(real_delta_time_sec);
 
+    // Update the sound manager last so it can use the CPU while the GPU
+    // is processing the scenery (doubled the frame-rate for me) -EMH-
 #ifdef ENABLE_AUDIO_SUPPORT
-    // 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)...
-    SGGeod geodPos = globals->get_aircraft_model()->get3DModel()->getPosition();
-    SGVec3d model_pos = SGVec3d::fromGeod(geodPos);
-
-    // 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, model_pos.sg());
-    sgdAddVec3( last_model_pos, sgdv3_null, model_pos.sg());
-    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, current_view->get_view_pos().sg());
-    sgdAddVec3( last_listener_pos,
-		sgdv3_null, current_view->get_view_pos().sg());
-
-    if ( sgdLengthVec3(sgdv3_help) > 0.2 ) {
-	sgCopyVec3( listener_vel, model_vel );
+    static bool smgr_init = true;
+    static SGPropertyNode *sound_working = fgGetNode("/sim/sound/working");
+    if (smgr_init == true) {
+        if (sound_working->getBoolValue() == true) {
+            fgInitSoundManager();
+            smgr_init = false;
+        }
     } else {
-	sgSetVec3( listener_vel, 0.0, 0.0, 0.0 );
-    }
-
-    globals->get_soundmgr()->set_listener_vel( listener_vel );
-
-    // set positional offset for sources
-    sgdVec3 dsource_pos_offset;
-    sgdSubVec3( dsource_pos_offset,
-                current_view->get_view_pos().sg(),
-                model_pos.sg() );
-    SGVec3d sgv_dsource_pos_offset = model_or.rotateBack(
-        surf_or.rotateBack(SGVec3d(dsource_pos_offset[0],
-        dsource_pos_offset[1], dsource_pos_offset[2])));
-
-    sgVec3 source_pos_offset;
-    sgSetVec3(source_pos_offset, sgv_dsource_pos_offset[0],
-        sgv_dsource_pos_offset[1], sgv_dsource_pos_offset[2]);
+        static SGPropertyNode *sound_enabled = fgGetNode("/sim/sound/enabled");
+        static SGSoundMgr *smgr = globals->get_soundmgr();
+        static bool smgr_enabled = true;
+
+        if (sound_working->getBoolValue() == false) {	// request to reinit
+           smgr->reinit();
+           smgr->resume();
+           sound_working->setBoolValue(true);
+        }
 
-    globals->get_soundmgr()->set_source_pos_all( source_pos_offset );
+        if (smgr_enabled != sound_enabled->getBoolValue()) {
+            if (smgr_enabled == true) { // request to suspend
+                smgr->suspend();
+                smgr_enabled = false;
+            } else {
+                smgr->resume();
+                smgr_enabled = true;
+            }
+        }
 
-    float orient[6];
-    for (int i = 0; i < 3; i++) {
-        orient[i] = sgv_at[i];
-        orient[i + 3] = sgv_up[i];
+        if (smgr_enabled == true) {
+            static SGPropertyNode *volume = fgGetNode("/sim/sound/volume");
+            smgr->set_volume(volume->getFloatValue());
+            smgr->update(delta_time_sec);
+        }
     }
-    globals->get_soundmgr()->set_listener_orientation( orient );
-
-    // set the velocity
-    // all sources are defined to be in the model
-    globals->get_soundmgr()->set_source_vel_all( model_vel );
-
-    // The listener is always positioned at the origin.
-    sgVec3 listener_pos;
-    sgSetVec3( listener_pos, 0.0, 0.0, 0.0 );
-    globals->get_soundmgr()->set_listener_pos( listener_pos );
 #endif
 
     // END Tile Manager udpates
 
     if (!scenery_loaded && globals->get_tile_mgr()->isSceneryLoaded()
-        && cur_fdm_state->get_inited()) {
+        && fgGetBool("sim/fdm-initialized")) {
         fgSetBool("sim/sceneryloaded",true);
-        fgSetFloat("/sim/sound/volume", init_volume);
-        globals->get_soundmgr()->set_volume(init_volume);
+        if (fgGetBool("/sim/sound/working")) {
+            globals->get_soundmgr()->activate();
+        }
+        globals->get_props()->tie("/sim/sound/devices/name",
+              SGRawValueFunctions<const char *>(0, fgSetNewSoundDevice), false);
     }
-
+    simgear::AtomicChangeListener::fireChangeListeners();
     fgRequestRedraw();
 
     SG_LOG( SG_ALL, SG_DEBUG, "" );
 }
 
+void fgInitSoundManager()
+{
+    SGSoundMgr *smgr = globals->get_soundmgr();
+
+    smgr->bind();
+    smgr->init(fgGetString("/sim/sound/device-name", NULL));
+
+    vector <const char*>devices = smgr->get_available_devices();
+    for (unsigned int i=0; i<devices.size(); i++) {
+        SGPropertyNode *p = fgGetNode("/sim/sound/devices/device", i, true);
+        p->setStringValue(devices[i]);
+    }
+    devices.clear();
+}
+
+void fgSetNewSoundDevice(const char *device)
+{
+    globals->get_soundmgr()->suspend();
+    globals->get_soundmgr()->stop();
+    globals->get_soundmgr()->init(device);
+    globals->get_soundmgr()->resume();
+}
+
 // Operation for querying OpenGL parameters. This must be done in a
 // valid OpenGL context, potentially in another thread.
 namespace
@@ -633,7 +479,9 @@ struct GeneralInitOperation : public GraphicsContextOperation
         general.set_glVendor( (char *)glGetString ( GL_VENDOR ) );
         general.set_glRenderer( (char *)glGetString ( GL_RENDERER ) );
         general.set_glVersion( (char *)glGetString ( GL_VERSION ) );
+        SG_LOG( SG_GENERAL, SG_INFO, general.get_glVendor() );
         SG_LOG( SG_GENERAL, SG_INFO, general.get_glRenderer() );
+        SG_LOG( SG_GENERAL, SG_INFO, general.get_glVersion() );
 
         GLint tmp;
         glGetIntegerv( GL_MAX_TEXTURE_SIZE, &tmp );
@@ -687,8 +535,7 @@ static void fgIdleFunction ( void ) {
 
     } else if ( idle_state == 2 ) {
         idle_state++;
-        // Read the list of available aircraft
-        fgReadAircraft();
+                
         fgSplashProgress("reading airport & navigation data");
 
 
@@ -748,13 +595,16 @@ static void fgIdleFunction ( void ) {
 
     } else if ( idle_state == 5 ) {
         idle_state++;
+
         ////////////////////////////////////////////////////////////////////
         // Initialize the 3D aircraft model subsystem (has a dependency on
         // the scenery subsystem.)
         ////////////////////////////////////////////////////////////////////
-        globals->set_aircraft_model(new FGAircraftModel);
-        globals->get_aircraft_model()->init();
-        globals->get_aircraft_model()->bind();
+        FGAircraftModel* acm = new FGAircraftModel;
+        globals->set_aircraft_model(acm);
+        //globals->add_subsystem("aircraft-model", acm);
+        acm->init();
+        acm->bind();
 
         ////////////////////////////////////////////////////////////////////
         // Initialize the view manager subsystem.
@@ -769,13 +619,11 @@ static void fgIdleFunction ( void ) {
     } else if ( idle_state == 6 ) {
         idle_state++;
         // Initialize the sky
-        SGPath ephem_data_path( globals->get_fg_root() );
-        ephem_data_path.append( "Astro" );
-        SGEphemeris *ephem = new SGEphemeris( ephem_data_path.c_str() );
-        ephem->update( globals->get_time_params()->getMjd(),
-                       globals->get_time_params()->getLst(),
-                       0.0 );
-        globals->set_ephem( ephem );
+
+        Ephemeris* eph = new Ephemeris;
+        globals->add_subsystem("ephmeris", eph);
+        eph->init(); // FIXME - remove this once SGSky code below is also a subsystem
+        eph->bind();
 
         // TODO: move to environment mgr
         thesky = new SGSky;
@@ -799,10 +647,7 @@ static void fgIdleFunction ( void ) {
         // Sun diameter: 1,390,000 kilometers
         thesky->build( 80000.0, 80000.0,
                        463.3, 361.8,
-                       globals->get_ephem()->getNumPlanets(),
-                       globals->get_ephem()->getPlanets(),
-                       globals->get_ephem()->getNumStars(),
-                       globals->get_ephem()->getStars(),
+                       *globals->get_ephem(),
                        fgGetNode("/environment", true));
 
         // Initialize MagVar model
@@ -847,13 +692,13 @@ static void fgIdleFunction ( void ) {
             SG_LOG( SG_GENERAL, SG_INFO,
                 "Starting intro music: " << mp3file.str() );
 
-#if defined( __CYGWIN__ )
+# if defined( __CYGWIN__ )
             string command = "start /m `cygpath -w " + mp3file.str() + "`";
-#elif defined( WIN32 )
+# elif defined( _WIN32 )
             string command = "start /m " + mp3file.str();
-#else
+# else
             string command = "mpg123 " + mp3file.str() + "> /dev/null 2>&1";
-#endif
+# endif
 
             system ( command.c_str() );
         }
@@ -879,12 +724,13 @@ static void fgIdleFunction ( void ) {
         // setup OpenGL view parameters
         globals->get_renderer()->init();
 
-        SG_LOG( SG_GENERAL, SG_INFO, "Panel visible = " << fgPanelVisible() );
         globals->get_renderer()->resize( fgGetInt("/sim/startup/xsize"),
                                          fgGetInt("/sim/startup/ysize") );
 
         fgSplashProgress("loading scenery objects");
-
+        int session = fgGetInt("/sim/session",0);
+        session++;
+        fgSetInt("/sim/session",session);
     }
 
     if ( idle_state == 1000 ) {
@@ -898,16 +744,17 @@ static void fgIdleFunction ( void ) {
 
 static void upper_case_property(const char *name)
 {
+    using namespace simgear;
     SGPropertyNode *p = fgGetNode(name, false);
     if (!p) {
         p = fgGetNode(name, true);
         p->setStringValue("");
     } else {
-        SGPropertyNode::Type t = p->getType();
-        if (t == SGPropertyNode::NONE || t == SGPropertyNode::UNSPECIFIED)
+        props::Type t = p->getType();
+        if (t == props::NONE || t == props::UNSPECIFIED)
             p->setStringValue("");
         else
-            assert(t == SGPropertyNode::STRING);
+            assert(t == props::STRING);
     }
     p->addChangeListener(new FGMakeUpperCase);
 }
@@ -954,7 +801,7 @@ bool fgMainInit( int argc, char **argv ) {
     fgInitFGRoot(argc, argv);
 
     // Check for the correct base package version
-    static char required_version[] = "1.9.0";
+    static char required_version[] = "2.0.0";
     string base_version = fgBasePackageVersion();
     if ( !(base_version == required_version) ) {
         // tell the operator how to use this application
@@ -987,18 +834,11 @@ bool fgMainInit( int argc, char **argv ) {
     fgRegisterIdleHandler( &fgIdleFunction );
     fgRegisterDrawHandler( &FGRenderer::update );
 
-#ifdef FG_ENABLE_MULTIPASS_CLOUDS
-    bool get_stencil_buffer = true;
-#else
-    bool get_stencil_buffer = false;
-#endif
-
     // Initialize plib net interface
     netInit( &argc, argv );
 
     // Clouds3D requires an alpha channel
-    // clouds may require stencil buffer
-    fgOSOpenWindow(get_stencil_buffer);
+    fgOSOpenWindow(true /* request stencil buffer */);
 
     // Initialize the splash screen right away
     fntInit();