X-Git-Url: https://git.mxchange.org/?a=blobdiff_plain;f=src%2FMain%2Fmain.cxx;h=05414d4cd278dfd4b3cbc2e0556dee7229c19fba;hb=a6e0a696376ba2d426eb534bb83ec42038a501e7;hp=7f09e45f909aefe872033856b13c63cb0db9e32d;hpb=32528d0cd65eb1aec904f25b692b2f961c028bfa;p=flightgear.git

diff --git a/src/Main/main.cxx b/src/Main/main.cxx
index 7f09e45f9..05414d4cd 100644
--- a/src/Main/main.cxx
+++ b/src/Main/main.cxx
@@ -21,24 +21,21 @@
 // $Id$
 
 
-#define MICHAEL_JOHNSON_EXPERIMENTAL_ENGINE_AUDIO
-
-
 #ifdef HAVE_CONFIG_H
 #  include <config.h>
 #endif
 
-#ifdef FG_MATH_EXCEPTION_CLASH
+#ifdef SG_MATH_EXCEPTION_CLASH
 #  include <math.h>
 #endif
 
 #ifdef HAVE_WINDOWS_H
-#  include <windows.h>                     
-#  include <float.h>                    
+#  include <windows.h>
+#  include <float.h>
 #endif
 
 #include <GL/glut.h>
-#include <simgear/xgl/xgl.h>
+#include <GL/gl.h>
 
 #include <stdio.h>
 #include <string.h>
@@ -49,26 +46,25 @@
 #endif
 
 #ifdef HAVE_SYS_STAT_H
-#  include <sys/stat.h> /* for stat() */
+#  include <sys/stat.h>		// for stat()
 #endif
 
 #ifdef HAVE_UNISTD_H
-#  include <unistd.h>    /* for stat() */
+#  include <unistd.h>		// for stat()
 #endif
 
-#include <plib/pu.h>			// plib include
-#include <plib/ssg.h>		// plib include
+// #ifdef HAVE_LIBX11
+// #  include <GL/glext.h>
+// #endif
 
-#ifdef ENABLE_AUDIO_SUPPORT
-#  include <plib/sl.h>		// plib include
-#  include <plib/sm.h>		// plib include
-#endif
+#include <plib/pu.h>
+#include <plib/ssg.h>
 
 #include <simgear/constants.h>  // for VERSION
 #include <simgear/debug/logstream.hxx>
 #include <simgear/math/polar3d.hxx>
-#include <simgear/math/fg_random.h>
-#include <simgear/misc/fgpath.hxx>
+#include <simgear/math/sg_random.h>
+#include <simgear/misc/sg_path.hxx>
 #include <simgear/sky/sky.hxx>
 #include <simgear/timing/sg_time.hxx>
 #include <simgear/timing/lowleveltime.h>
@@ -84,39 +80,56 @@
 
 #include <FDM/UIUCModel/uiuc_aircraftdir.h>
 #include <GUI/gui.h>
+#include <GUI/sgVec3Slider.hxx>
 #include <Joystick/joystick.hxx>
 #ifdef FG_NETWORK_OLK
 #include <NetworkOLK/network.h>
 #endif
+#include <Objects/matlib.hxx>
 #include <Scenery/scenery.hxx>
 #include <Scenery/tilemgr.hxx>
+#ifdef ENABLE_AUDIO_SUPPORT
+#  include <Sound/soundmgr.hxx>
+#  include <Sound/morse.hxx>
+#endif
 #include <Time/event.hxx>
 #include <Time/fg_timer.hxx>
+#include <Time/light.hxx>
 #include <Time/sunpos.hxx>
 #include <Time/tmp.hxx>
 
+// begin - added Venky
+//    $$$ begin - added VS Renganathan
+#include <simgear/misc/sgstream.hxx>
+#include <FDM/flight.hxx>
+#include <FDM/ADA.hxx>
+void fgLoadDCS (void);
+void fgUpdateDCS (void);
+ssgSelector *ship_sel=NULL;
+// upto 32 instances of a same object can be loaded.
+ssgTransform *ship_pos[32];
+double obj_lat[32],obj_lon[32],obj_alt[32];
+int objc=0;
+//    $$$ end - added VS Renganathan
+// end - added Venky
+
 #ifndef FG_OLD_WEATHER
 #  include <WeatherCM/FGLocalWeatherDatabase.h>
 #else
 #  include <Weather/weather.hxx>
 #endif
 
+#include "version.h"
+
 #include "bfi.hxx"
 #include "fg_init.hxx"
 #include "fg_io.hxx"
 #include "globals.hxx"
 #include "keyboard.hxx"
-#include "options.hxx"
 #include "splash.hxx"
-#include "views.hxx"
-
 
-// -dw- use custom sioux settings so I can see output window
 #ifdef macintosh
-#  ifndef FG_NDEBUG
-#    include <sioux.h> // settings for output window
-#  endif
-#  include <console.h>
+#  include <console.h>		// -dw- for command line dialog
 #endif
 
 
@@ -127,35 +140,40 @@ FGGeneral general;
 // our initializations out of the glutIdleLoop() so that we can get a
 // splash screen up and running right away.
 static int idle_state = 0;
-static int global_multi_loop;
+static long global_multi_loop;
 
 // attempt to avoid a large bounce at startup
 static bool initial_freeze = true;
 
-// Another hack
-int use_signals = 0;
+// forward declaration
+void fgReshape( int width, int height );
 
 // Global structures for the Audio library
 #ifdef ENABLE_AUDIO_SUPPORT
-slEnvelope pitch_envelope ( 1, SL_SAMPLE_ONE_SHOT ) ;
-slEnvelope volume_envelope ( 1, SL_SAMPLE_ONE_SHOT ) ;
-slScheduler *audio_sched;
-smMixer *audio_mixer;
-slSample *s1;
-slSample *s2;
+   static FGSimpleSound *s1;
+   static FGSimpleSound *s2;
 #endif
 
 
 // ssg variables
 ssgRoot *scene = NULL;
 ssgBranch *terrain = NULL;
-ssgSelector *penguin_sel = NULL;
-ssgTransform *penguin_pos = NULL;
+
+// aircraft model stuff
+ssgSelector *acmodel_selector = NULL;
+ssgTransform *acmodel_pos = NULL;
+ssgSelector *prop_selector = NULL;
+ssgSelector *flaps_selector = NULL;
+int acmodel_npropsettings;
+int acmodel_proprpms[4][2];  // different propeller settings
+
+ssgRoot *lighting = NULL;
+ssgBranch *ground = NULL;
+ssgBranch *airport = NULL;
 
 #ifdef FG_NETWORK_OLK
 ssgSelector *fgd_sel = NULL;
 ssgTransform *fgd_pos = NULL;
-//sgMat4 sgTUX;
 #endif
 
 // current fdm/position used for view
@@ -173,7 +191,7 @@ sgMat4 copy_of_ssgOpenGLAxisSwapMatrix =
   {  0.0f,  0.0f,  0.0f,  1.0f }
 } ;
 
-// The following defines flight gear options. Because glutlib will also
+// The following defines flightgear options. Because glutlib will also
 // want to parse its own options, those options must not be included here
 // or they will get parsed by the main program option parser. Hence case
 // is significant for any option added that might be in conflict with
@@ -200,6 +218,7 @@ ssgSimpleState *menus;
 
 void fgBuildRenderStates( void ) {
     default_state = new ssgSimpleState;
+    default_state->ref();
     default_state->disable( GL_TEXTURE_2D );
     default_state->enable( GL_CULL_FACE );
     default_state->enable( GL_COLOR_MATERIAL );
@@ -211,17 +230,36 @@ void fgBuildRenderStates( void ) {
     default_state->disable( GL_LIGHTING );
 
     hud_and_panel = new ssgSimpleState;
+    hud_and_panel->ref();
     hud_and_panel->disable( GL_CULL_FACE );
     hud_and_panel->disable( GL_TEXTURE_2D );
     hud_and_panel->disable( GL_LIGHTING );
     hud_and_panel->enable( GL_BLEND );
 
     menus = new ssgSimpleState;
+    menus->ref();
     menus->disable( GL_CULL_FACE );
     menus->disable( GL_TEXTURE_2D );
     menus->enable( GL_BLEND );
 }
 
+// fgFindNode -- a function that finds a named node in an ssg graph
+ssgEntity *fgFindNode( ssgEntity *node, const char *name ) {
+  if ( node->getName() != NULL && strcmp( name, node->getName() ) == 0 ) {
+    return node;
+  } else if ( node->isAKindOf( ssgTypeBranch() ) ) {
+    ssgEntity *kid = ((ssgBranch*)node)->getKid(0);
+    while (kid != NULL) {
+      ssgEntity *n = fgFindNode(kid, name);
+      if (n != NULL)
+	return n;
+
+      kid = ((ssgBranch*)node)->getNextKid();
+    }
+  }
+
+  return NULL;
+}
 
 // fgInitVisuals() -- Initialize various GL/view parameters
 void fgInitVisuals( void ) {
@@ -231,7 +269,7 @@ void fgInitVisuals( void ) {
 
 #ifndef GLUT_WRONG_VERSION
     // Go full screen if requested ...
-    if ( current_options.get_fullscreen() ) {
+    if ( fgGetBool("/sim/startup/fullscreen") ) {
 	glutFullScreen();
     }
 #endif
@@ -250,14 +288,14 @@ void fgInitVisuals( void ) {
 
     // glFogi (GL_FOG_MODE, GL_LINEAR);
     glFogi (GL_FOG_MODE, GL_EXP2);
-    if ( (current_options.get_fog() == 1) || 
-	 (current_options.get_shading() == 0) ) {
+    if ( (fgGetString("/sim/rendering/fog") == "disabled") || 
+	 (!fgGetBool("/sim/rendering/shading"))) {
 	// if fastest fog requested, or if flat shading force fastest
 	glHint ( GL_FOG_HINT, GL_FASTEST );
-    } else if ( current_options.get_fog() == 2 ) {
+    } else if ( fgGetString("/sim/rendering/fog") == "nicest" ) {
 	glHint ( GL_FOG_HINT, GL_NICEST );
     }
-    if ( current_options.get_wireframe() ) {
+    if ( fgGetBool("/sim/rendering/wireframe") ) {
 	// draw wire frame
 	glPolygonMode( GL_FRONT_AND_BACK, GL_LINE );
     }
@@ -280,7 +318,11 @@ void fgRenderFrame( void ) {
     fgLIGHT *l = &cur_light_params;
     static double last_visibility = -9999;
 
-    double angle;
+    static GLfloat fog_exp_density;
+    static GLfloat fog_exp2_density;
+    static GLfloat fog_exp2_punch_through;
+    
+    // double angle;
     // GLfloat black[4] = { 0.0, 0.0, 0.0, 1.0 };
     // GLfloat white[4] = { 1.0, 1.0, 1.0, 1.0 };
     // GLfloat terrain_color[4] = { 0.54, 0.44, 0.29, 1.0 };
@@ -289,7 +331,7 @@ void fgRenderFrame( void ) {
     
     if ( idle_state != 1000 ) {
 	// still initializing, draw the splash screen
-	if ( current_options.get_splash_screen() == 1 ) {
+	if ( fgGetBool("/sim/startup/splash-screen") ) {
 	    fgSplashUpdate(0.0);
 	}
     } else {
@@ -298,28 +340,115 @@ void fgRenderFrame( void ) {
 	// now work without seg faulting the system.
 
 	// printf("Ground = %.2f  Altitude = %.2f\n", scenery.cur_elev, 
-	//        FG_Altitude * FEET_TO_METER);
+	//        FG_Altitude * SG_FEET_TO_METER);
     
 	// this is just a temporary hack, to make me understand Pui
 	// timerText -> setLabel (ctime (&t->cur_time));
 	// end of hack
 
-	// update view volume parameters
-	// cout << "before pilot_view update" << endl;
-	pilot_view.UpdateViewParams(*cur_fdm_state);
-	// cout << "after pilot_view update" << endl;
-	current_view.UpdateViewParams(cur_view_fdm);
+	// calculate our current position in cartesian space
+	scenery.center = scenery.next_center;
+	// printf("scenery center = %.2f %.2f %.2f\n", scenery.center.x(),
+	//        scenery.center.y(), scenery.center.z());
+
+	FGViewerRPH *pilot_view =
+	    (FGViewerRPH *)globals->get_viewmgr()->get_view( 0 );
+
+	pilot_view->set_geod_view_pos( cur_fdm_state->get_Longitude(), 
+				       cur_fdm_state->get_Lat_geocentric(), 
+				       cur_fdm_state->get_Altitude() *
+				       SG_FEET_TO_METER );
+	pilot_view->set_sea_level_radius( cur_fdm_state->
+					  get_Sea_level_radius() *
+					  SG_FEET_TO_METER ); 
+	pilot_view->set_rph( cur_fdm_state->get_Phi(),
+			     cur_fdm_state->get_Theta(),
+			     cur_fdm_state->get_Psi() );
+
+	FGViewerLookAt *chase_view =
+	    (FGViewerLookAt *)globals->get_viewmgr()->get_view( 1 );
+
+	sgVec3 po;		// chase view pilot_offset
+	sgVec3 wup;		// chase view world up
+	sgSetVec3( po, 0.0, 0.0, 100.0 );
+	sgCopyVec3( wup, pilot_view->get_world_up() );
+	sgMat4 CXFM;		// chase view + pilot offset xform
+	sgMakeRotMat4( CXFM,
+		       chase_view->get_view_offset() * SGD_RADIANS_TO_DEGREES -
+		       cur_fdm_state->get_Psi() * SGD_RADIANS_TO_DEGREES,
+		       wup );
+	sgVec3 npo;		// new pilot offset after rotation
+        sgVec3 *pPO = PilotOffsetGet();
+	sgXformVec3( po, *pPO, pilot_view->get_UP() );
+	sgXformVec3( npo, po, CXFM );
+
+	chase_view->set_geod_view_pos( cur_fdm_state->get_Longitude(), 
+				       cur_fdm_state->get_Lat_geocentric(), 
+				       cur_fdm_state->get_Altitude() *
+				       SG_FEET_TO_METER );
+	chase_view->set_sea_level_radius( cur_fdm_state->
+					  get_Sea_level_radius() *
+					  SG_FEET_TO_METER );
+	chase_view->set_pilot_offset( npo[0], npo[1], npo[2] );
+	chase_view->set_view_forward( pilot_view->get_view_pos() ); 
+	chase_view->set_view_up( wup );
+
+#if 0
+	sgMat4 rph;
+	sgCopyMat4( rph, pilot_view->get_VIEW() );
+	cout << "RPH Matrix = " << endl;
+	int i, j;
+	for ( i = 0; i < 4; i++ ) {
+	    for ( j = 0; j < 4; j++ ) {
+		printf("%10.4f ", rph[i][j]);
+	    }
+	    cout << endl;
+	}
+
+	sgMat4 la;
+	sgCopyMat4( la, chase_view->get_VIEW() );
+	cout << "LookAt Matrix = " << endl;
+	for ( i = 0; i < 4; i++ ) {
+	    for ( j = 0; j < 4; j++ ) {
+		printf("%10.4f ", la[i][j]);
+	    }
+	    cout << endl;
+	}
+#endif
+
+	// update view port
+	fgReshape( fgGetInt("/sim/startup/xsize"),
+		   fgGetInt("/sim/startup/ysize") );
+
+#if 0
+	// swing and a miss
+
+	if ( ! fgPanelVisible() ) {
+	    xglViewport( 0, 0 ,
+			 (GLint)(fgGetInt("/sim/startup/xsize")),
+			 (GLint)(fgGetInt("/sim/startup/ysize")) );
+	} else {
+	    int view_h =
+		int( (current_panel->getViewHeight() -
+		      current_panel->getYOffset())
+		     * (fgGetInt("/sim/startup/ysize") / 768.0) );
+	    glViewport( 0, 
+			(GLint)(fgGetInt("/sim/startup/ysize") - view_h),
+			(GLint)(fgGetInt("/sim/startup/xsize")),
+			(GLint)(view_h) );
+	}
+#endif
 
 	// set the sun position
 	glLightfv( GL_LIGHT0, GL_POSITION, l->sun_vec );
 
 	clear_mask = GL_DEPTH_BUFFER_BIT;
-	if ( current_options.get_wireframe() ) {
+	if ( fgGetBool("/sim/rendering/wireframe") ) {
 	    clear_mask |= GL_COLOR_BUFFER_BIT;
 	}
 
-	if ( current_options.get_skyblend() ) {
-	    if ( current_options.get_textures() ) {
+	if ( fgGetBool("/sim/rendering/skyblend") ) {
+	    if ( fgGetBool("/sim/rendering/textures") ) {
 		// glClearColor(black[0], black[1], black[2], black[3]);
 		glClearColor(l->adj_fog_color[0], l->adj_fog_color[1], 
 			     l->adj_fog_color[2], l->adj_fog_color[3]);
@@ -340,15 +469,7 @@ void fgRenderFrame( void ) {
 	// ssg does to set up the model view matrix
 	glMatrixMode(GL_MODELVIEW);
 	glLoadIdentity();
-	ssgSetCamera( current_view.VIEW );
-
-	/*
-	sgMat4 vm_tmp, view_mat;
-	sgTransposeNegateMat4 ( vm_tmp, current_view.VIEW ) ;
-	sgCopyMat4( view_mat, copy_of_ssgOpenGLAxisSwapMatrix ) ;
-	sgPreMultMat4( view_mat, vm_tmp ) ;
-	glLoadMatrixf( (float *)view_mat );
-	*/
+	ssgSetCamera( (sgVec4 *)globals->get_current_view()->get_VIEW() );
 
 	// set the opengl state to known default values
 	default_state->force();
@@ -360,11 +481,10 @@ void fgRenderFrame( void ) {
 	thesky->set_visibility( current_weather.get_visibility() );
 #endif
 
-	thesky->modify_vis( cur_fdm_state->get_Altitude() * FEET_TO_METER,
-				
+	thesky->modify_vis( cur_fdm_state->get_Altitude() * SG_FEET_TO_METER,
 			    ( global_multi_loop * 
-			      current_options.get_speed_up() ) /
-			    (double)current_options.get_model_hz() );
+			      fgGetInt("/sim/speed-up") ) /
+			    (double)fgGetInt("/sim/model-hz") );
 
 	double actual_visibility = thesky->get_visibility();
 	// cout << "actual visibility = " << actual_visibility << endl;
@@ -374,33 +494,20 @@ void fgRenderFrame( void ) {
 
 	    // cout << "----> updating fog params" << endl;
 		
-	    GLfloat fog_exp_density;
-	    GLfloat fog_exp2_density;
-    
 	    // for GL_FOG_EXP
-	    fog_exp_density = -log(0.01 / actual_visibility);
+	    fog_exp_density = -log(0.01) / actual_visibility;
     
 	    // for GL_FOG_EXP2
 	    fog_exp2_density = sqrt( -log(0.01) ) / actual_visibility;
-    
-	    // Set correct opengl fog density
-	    glFogf (GL_FOG_DENSITY, fog_exp2_density);
+	    fog_exp2_punch_through = sqrt( -log(0.01) ) / 
+		( actual_visibility * 1.5 );
 	}
- 
-	// update the sky dome
-	if ( current_options.get_skyblend() ) {
-	    sgVec3 view_pos;
-	    sgSetVec3( view_pos,
-		       current_view.get_view_pos().x(),
-		       current_view.get_view_pos().y(),
-		       current_view.get_view_pos().z() );
-
-	    sgVec3 zero_elev;
-	    sgSetVec3( zero_elev,
-		       current_view.get_cur_zero_elev().x(),
-		       current_view.get_cur_zero_elev().y(),
-		       current_view.get_cur_zero_elev().z() );
 
+	// Set correct opengl fog density
+	glFogf (GL_FOG_DENSITY, fog_exp2_density);
+
+	// update the sky dome
+	if ( fgGetBool("/sim/rendering/skyblend") ) {
 	    /* cout << "thesky->repaint() sky_color = "
 		 << cur_light_params.sky_color[0] << " "
 		 << cur_light_params.sky_color[1] << " "
@@ -436,11 +543,12 @@ void fgRenderFrame( void ) {
 		 << " moon ra = " << globals->get_ephem()->getMoonRightAscension()
 		 << " moon dec = " << globals->get_ephem()->getMoonDeclination() << endl; */
 
-	    thesky->reposition( view_pos, zero_elev,
-				current_view.get_local_up(),
+	    thesky->reposition( globals->get_current_view()->get_view_pos(),
+				globals->get_current_view()->get_zero_elev(),
+				globals->get_current_view()->get_world_up(),
 				cur_fdm_state->get_Longitude(),
 				cur_fdm_state->get_Latitude(),
-				cur_fdm_state->get_Altitude() * FEET_TO_METER,
+				cur_fdm_state->get_Altitude() * SG_FEET_TO_METER,
 				cur_light_params.sun_rotation,
 				globals->get_time_params()->getGst(),
 				globals->get_ephem()->getSunRightAscension(),
@@ -452,43 +560,41 @@ void fgRenderFrame( void ) {
 	}
 
 	glEnable( GL_DEPTH_TEST );
-	if ( current_options.get_fog() > 0 ) {
+	if ( fgGetString("/sim/rendering/fog") != (string)"disabled" ) {
 	    glEnable( GL_FOG );
 	    glFogi( GL_FOG_MODE, GL_EXP2 );
 	    glFogfv( GL_FOG_COLOR, l->adj_fog_color );
 	}
 
-	// set lighting parameters
+	// set sun/lighting parameters
+	ssgGetLight( 0 ) -> setPosition( l->sun_vec );
+
+        // GL_LIGHT_MODEL_AMBIENT has a default non-zero value so if
+        // we only update GL_AMBIENT for our lights we will never get
+        // a completely dark scene.  So, we set GL_LIGHT_MODEL_AMBIENT
+        // explicitely to black.
 	GLfloat black[4] = { 0.0, 0.0, 0.0, 1.0 };
-	glLightModelfv( GL_LIGHT_MODEL_AMBIENT, l->scene_ambient );
-	glLightfv( GL_LIGHT0, GL_AMBIENT, black );
-	glLightfv( GL_LIGHT0, GL_DIFFUSE, l->scene_diffuse );
-	// glLightfv(GL_LIGHT0, GL_SPECULAR, white );
+	GLfloat white[4] = { 1.0, 1.0, 1.0, 1.0 };
+	glLightModelfv( GL_LIGHT_MODEL_AMBIENT, black );
+
+	ssgGetLight( 0 ) -> setColour( GL_AMBIENT, l->scene_ambient );
+	ssgGetLight( 0 ) -> setColour( GL_DIFFUSE, l->scene_diffuse );
+	// ssgGetLight( 0 ) -> setColour( GL_SPECULAR, l->scene_white );
 
 	// texture parameters
 	// glEnable( GL_TEXTURE_2D );
 	glTexEnvi( GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE ) ;
 	glHint( GL_PERSPECTIVE_CORRECTION_HINT, GL_NICEST ) ;
-	// set base color (I don't think this is doing anything here)
-	// glMaterialfv (GL_FRONT, GL_AMBIENT, white);
-	//  (GL_FRONT, GL_DIFFUSE, white);
-	// glMaterialfv (GL_FRONT, GL_SPECULAR, white);
-	// glMaterialfv (GL_FRONT, GL_SHININESS, mat_shininess);
-
-	sgVec3 sunpos;
-	sgSetVec3( sunpos, l->sun_vec[0], l->sun_vec[1], l->sun_vec[2] );
-	ssgGetLight( 0 ) -> setPosition( sunpos );
 
 	// glMatrixMode( GL_PROJECTION );
 	// glLoadIdentity();
- 	float fov = current_options.get_fov();
- 	// ssgSetFOV(fov * current_view.get_win_ratio(), fov);
- 	ssgSetFOV(fov, fov * current_view.get_win_ratio());
+ 	float fov = globals->get_current_view()->get_fov();
+ 	ssgSetFOV(fov, fov * globals->get_current_view()->get_win_ratio());
 
-	double agl = current_aircraft.fdm_state->get_Altitude() * FEET_TO_METER
+	double agl = current_aircraft.fdm_state->get_Altitude() * SG_FEET_TO_METER
 	    - scenery.cur_elev;
 
-	// FG_LOG( FG_ALL, FG_INFO, "visibility is " 
+	// SG_LOG( SG_ALL, SG_INFO, "visibility is " 
 	//         << current_weather.get_visibility() );
 	    
 	if ( agl > 10.0 ) {
@@ -497,26 +603,18 @@ void fgRenderFrame( void ) {
 	    ssgSetNearFar( 0.5f, 120000.0f );
 	}
 
-	if ( current_options.get_view_mode() == 
-	     fgOPTIONS::FG_VIEW_PILOT )
-        {
-	    // disable TuX
-	    penguin_sel->select(0);
-	} else if ( current_options.get_view_mode() == 
-		    fgOPTIONS::FG_VIEW_FOLLOW )
-        {
-	    // select view matrix from front of view matrix queue
-	    // FGMat4Wrapper tmp = current_view.follow.front();
-	    // sgCopyMat4( sgVIEW, tmp.m );
-
-	    // enable TuX and set up his position and orientation
-	    penguin_sel->select(1);
+	if ( globals->get_viewmgr()->get_current() == 0 ) {
+	    // disable aircraft model
+	    acmodel_selector->select(0);
+	} else { 
+	    // enable aircraft model and set up its position and orientation
+	    acmodel_selector->select(1);
+
+	    FGViewerRPH *pilot_view =
+		(FGViewerRPH *)globals->get_viewmgr()->get_view( 0 );
 
 	    sgMat4 sgTRANS;
-	    sgMakeTransMat4( sgTRANS, 
-			     pilot_view.view_pos.x(),
-			     pilot_view.view_pos.y(),
-			     pilot_view.view_pos.z() );
+	    sgMakeTransMat4( sgTRANS, pilot_view->get_view_pos() );
 
 	    sgVec3 ownship_up;
 	    sgSetVec3( ownship_up, 0.0, 0.0, 1.0);
@@ -532,16 +630,36 @@ void fgRenderFrame( void ) {
 	    // sgTUX = ( sgROT * pilot_view.VIEW_ROT ) * sgTRANS
 	    sgMat4 sgTUX;
 	    sgCopyMat4( sgTUX, sgROT );
-	    sgPostMultMat4( sgTUX, pilot_view.VIEW_ROT );
+	    sgPostMultMat4( sgTUX, pilot_view->get_VIEW_ROT() );
 	    sgPostMultMat4( sgTUX, sgTRANS );
 	
 	    sgCoord tuxpos;
 	    sgSetCoord( &tuxpos, sgTUX );
-	    penguin_pos->setTransform( &tuxpos );
+	    acmodel_pos->setTransform( &tuxpos );
+
+	    // set up moving parts
+	    if (flaps_selector != NULL) {
+	      flaps_selector->select( (controls.get_flaps() > 0.5f) ? 1 : 2 );
+	    }
+
+	    if (prop_selector != NULL) {
+	      int propsel_mask = 0;
+	      for (int i = 0; i < acmodel_npropsettings; i++) {
+		if (FGBFI::getRPM() >= acmodel_proprpms[i][0] &&
+		    FGBFI::getRPM() <= acmodel_proprpms[i][1]) {
+		  propsel_mask |= 1 << i;
+		}
+	      }
+	      prop_selector->select(propsel_mask);
+	    }
 	}
 
+	// $$$ begin - added VS Renganthan 17 Oct 2K
+	fgUpdateDCS();
+	// $$$ end - added VS Renganthan 17 Oct 2K
+
 # ifdef FG_NETWORK_OLK
-	if ( current_options.get_network_olk() ) {
+	if ( fgGetBool("/sim/networking/network-olk") ) {
 	    sgCoord fgdpos;
 	    other = head->next;             /* put listpointer to start  */
 	    while ( other != tail) {        /* display all except myself */
@@ -561,41 +679,55 @@ void fgRenderFrame( void ) {
 	}
 # endif
 
-	// ssgSetCamera( current_view.VIEW );
-
 	// position tile nodes and update range selectors
 	global_tile_mgr.prep_ssg_nodes();
 
-	// force the default state so ssg can get back on track if
-	// we've changed things elsewhere (this is now handled
-	// differently)
-	// 
-	// FGMaterialSlot m_slot;
-	// FGMaterialSlot *m_ptr = &m_slot;
-	// if ( material_mgr.find( "Default", m_ptr ) ) {
-	//    m_ptr->get_state()->force();
-	// }
+	if ( fgGetBool("/sim/rendering/skyblend") ) {
+	    // draw the sky backdrop
+
+            // we need a white diffuse light for the phase of the moon
+            ssgGetLight( 0 ) -> setColour( GL_DIFFUSE, white );
 
-	// draw the sky backdrop
-	thesky->preDraw();
+	    thesky->preDraw();
+
+            // return to the desired diffuse color
+            ssgGetLight( 0 ) -> setColour( GL_DIFFUSE, l->scene_diffuse );
+	}
 
 	// draw the ssg scene
 	glEnable( GL_DEPTH_TEST );
 	ssgCullAndDraw( scene );
 
-	// draw the sky cloud layers
-	thesky->postDraw( cur_fdm_state->get_Altitude() * FEET_TO_METER );
+	// change state for lighting here
+
+	// draw lighting
+	// Set punch through fog density
+	glFogf (GL_FOG_DENSITY, fog_exp2_punch_through);
+
+	ssgCullAndDraw( lighting );
+
+	if ( fgGetBool("/sim/rendering/skyblend") ) {
+	    // draw the sky cloud layers
+	    thesky->postDraw( cur_fdm_state->get_Altitude() * SG_FEET_TO_METER );
+	}
 
 	// display HUD && Panel
 	glDisable( GL_FOG );
 	glDisable( GL_DEPTH_TEST );
 	// glDisable( GL_CULL_FACE );
 	// glDisable( GL_TEXTURE_2D );
+
+	// update the controls subsystem
+	controls.update();
+
 	hud_and_panel->apply();
 	fgCockpitUpdate();
 
+	// update the panel subsystem
+	if (current_panel != 0)
+	  current_panel->update();
+
 	// We can do translucent menus, so why not. :-)
-	// glEnable ( GL_BLEND ) ;
 	menus->apply();
 	glBlendFunc ( GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA ) ;
 	puDisplay();
@@ -609,97 +741,110 @@ void fgRenderFrame( void ) {
 
 
 // Update internal time dependent calculations (i.e. flight model)
-void fgUpdateTimeDepCalcs(int multi_loop, int remainder) {
-    static fdm_state_list fdm_list;
+void fgUpdateTimeDepCalcs() {
+    static bool inited = false;
+
     fgLIGHT *l = &cur_light_params;
     int i;
 
-    // update the flight model
-    if ( multi_loop < 0 ) {
-	multi_loop = 1;
-    }
+    long multi_loop = 1;
 
     if ( !globals->get_freeze() && !initial_freeze ) {
-	// run Autopilot system
-	current_autopilot->run();
-
-	// printf("updating flight model x %d\n", multi_loop);
-	/* fgFDMUpdate( current_options.get_flight_model(), 
-		     fdm_state, 
-		     multi_loop * current_options.get_speed_up(),
-		     remainder ); */
-	cur_fdm_state->update( multi_loop * current_options.get_speed_up() );
-	FGSteam::update( multi_loop * current_options.get_speed_up() );
+	// conceptually, this could be done for each fdm instance ...
+
+	if ( !inited ) {
+	    cur_fdm_state->stamp();
+	    inited = true;
+	}
+
+	SGTimeStamp current;
+	current.stamp();
+	long elapsed = current - cur_fdm_state->get_time_stamp();
+	cur_fdm_state->set_time_stamp( current );
+	elapsed += cur_fdm_state->get_remainder();
+	// cout << "elapsed = " << elapsed << endl;
+	// cout << "dt = " << cur_fdm_state->get_delta_t() << endl;
+	multi_loop = (long)(((double)elapsed * 0.000001) /
+			       cur_fdm_state->get_delta_t() );
+	cur_fdm_state->set_multi_loop( multi_loop );
+	long remainder = elapsed - (long)( (multi_loop*1000000) *
+				     cur_fdm_state->get_delta_t() );
+	cur_fdm_state->set_remainder( remainder );
+	// cout << "remainder = " << remainder << endl;
+
+	// chop max interations to something reasonable if the sim was
+	// delayed for an excesive amount of time
+	if ( multi_loop > 2.0 / cur_fdm_state->get_delta_t() ) {
+	    multi_loop = (int)(2.0 / cur_fdm_state->get_delta_t());
+	    cur_fdm_state->set_remainder( 0 );
+	}
+
+	// cout << "multi_loop = " << multi_loop << endl;
+	for ( i = 0; i < multi_loop * fgGetInt("/sim/speed-up"); ++i ) {
+	    // run Autopilot system
+	    current_autopilot->run();
+
+	    // update autopilot
+	    cur_fdm_state->update( 1 );
+	}
+	FGSteam::update( multi_loop * fgGetInt("/sim/speed-up") );
     } else {
-	// fgFDMUpdate( current_options.get_flight_model(), 
-	//              fdm_state, 0, remainder );
 	cur_fdm_state->update( 0 );
 	FGSteam::update( 0 );
 
-	if ( global_tile_mgr.queue_size() == 0 ) {
+	//if ( global_tile_mgr.queue_size() == 0 ) {
 	    initial_freeze = false;
-	}
+	    //}
     }
 
-    fdm_list.push_back( *cur_fdm_state );
-    while ( fdm_list.size() > 15 ) {
-	fdm_list.pop_front();
-    }
-
-    if ( current_options.get_view_mode() == fgOPTIONS::FG_VIEW_PILOT ) {
+    if ( fgGetString("/sim/view-mode") == "pilot" ) {
 	cur_view_fdm = *cur_fdm_state;
 	// do nothing
-    } else if ( current_options.get_view_mode() == fgOPTIONS::FG_VIEW_FOLLOW ) {
-	cur_view_fdm = fdm_list.front();
     }
 
     // update the view angle
+    FGViewer *v = globals->get_current_view();
     for ( i = 0; i < multi_loop; i++ ) {
-	if ( fabs(current_view.get_goal_view_offset() - 
-		  current_view.get_view_offset()) < 0.05 )
-	{
-	    current_view.set_view_offset( current_view.get_goal_view_offset() );
+	if ( fabs(v->get_goal_view_offset() - v->get_view_offset()) < 0.05 ) {
+	    v->set_view_offset( v->get_goal_view_offset() );
 	    break;
 	} else {
-	    // move current_view.view_offset towards current_view.goal_view_offset
-	    if ( current_view.get_goal_view_offset() > 
-		 current_view.get_view_offset() )
+	    // move current_view.view_offset towards
+	    // current_view.goal_view_offset
+	    if ( v->get_goal_view_offset() > v->get_view_offset() )
             {
-		if ( current_view.get_goal_view_offset() - 
-		     current_view.get_view_offset() < FG_PI )
-                {
-		    current_view.inc_view_offset( 0.01 );
+		if ( v->get_goal_view_offset() - v->get_view_offset() < SGD_PI ){
+		    v->inc_view_offset( 0.01 );
 		} else {
-		    current_view.inc_view_offset( -0.01 );
+		    v->inc_view_offset( -0.01 );
 		}
 	    } else {
-		if ( current_view.get_view_offset() - 
-		     current_view.get_goal_view_offset() < FG_PI )
-                {
-		    current_view.inc_view_offset( -0.01 );
+		if ( v->get_view_offset() - v->get_goal_view_offset() < SGD_PI ){
+		    v->inc_view_offset( -0.01 );
 		} else {
-		    current_view.inc_view_offset( 0.01 );
+		    v->inc_view_offset( 0.01 );
 		}
 	    }
-	    if ( current_view.get_view_offset() > FG_2PI ) {
-		current_view.inc_view_offset( -FG_2PI );
-	    } else if ( current_view.get_view_offset() < 0 ) {
-		current_view.inc_view_offset( FG_2PI );
+	    if ( v->get_view_offset() > SGD_2PI ) {
+		v->inc_view_offset( -SGD_2PI );
+	    } else if ( v->get_view_offset() < 0 ) {
+		v->inc_view_offset( SGD_2PI );
 	    }
 	}
     }
 
-    double tmp = -(l->sun_rotation + FG_PI) 
-	- (cur_fdm_state->get_Psi() - current_view.get_view_offset() );
+    double tmp = -(l->sun_rotation + SGD_PI) 
+	- (cur_fdm_state->get_Psi() -
+	   globals->get_current_view()->get_view_offset() );
     while ( tmp < 0.0 ) {
-	tmp += FG_2PI;
+	tmp += SGD_2PI;
     }
-    while ( tmp > FG_2PI ) {
-	tmp -= FG_2PI;
+    while ( tmp > SGD_2PI ) {
+	tmp -= SGD_2PI;
     }
     /* printf("Psi = %.2f, viewoffset = %.2f sunrot = %.2f rottosun = %.2f\n",
-	   FG_Psi * RAD_TO_DEG, current_view.view_offset * RAD_TO_DEG, 
-	   -(l->sun_rotation+FG_PI) * RAD_TO_DEG, tmp * RAD_TO_DEG); */
+	   FG_Psi * SGD_RADIANS_TO_DEGREES, current_view.view_offset * SGD_RADIANS_TO_DEGREES, 
+	   -(l->sun_rotation+SGD_PI) * SGD_RADIANS_TO_DEGREES, tmp * SGD_RADIANS_TO_DEGREES); */
     l->UpdateAdjFog();
 
     // Update solar system
@@ -708,9 +853,7 @@ void fgUpdateTimeDepCalcs(int multi_loop, int remainder) {
 				  cur_fdm_state->get_Latitude() );
 
     // Update radio stack model
-    current_radiostack->update( cur_fdm_state->get_Longitude(),
-				cur_fdm_state->get_Latitude(),
-				cur_fdm_state->get_Altitude() * FEET_TO_METER );
+    current_radiostack->update();
 }
 
 
@@ -718,14 +861,14 @@ void fgInitTimeDepCalcs( void ) {
     // initialize timer
 
     // #ifdef HAVE_SETITIMER
-    //   fgTimerInit( 1.0 / current_options.get_model_hz(), 
+    //   fgTimerInit( 1.0 / fgGetInt("/sim/model-hz"), 
     //                fgUpdateTimeDepCalcs );
     // #endif HAVE_SETITIMER
 }
 
 
 static const double alt_adjust_ft = 3.758099;
-static const double alt_adjust_m = alt_adjust_ft * FEET_TO_METER;
+static const double alt_adjust_m = alt_adjust_ft * SG_FEET_TO_METER;
 
 
 // What should we do when we have nothing else to do?  Let's get ready
@@ -743,11 +886,11 @@ static void fgMainLoop( void ) {
 
     SGTime *t = globals->get_time_params();
 
-    FG_LOG( FG_ALL, FG_DEBUG, "Running Main Loop");
-    FG_LOG( FG_ALL, FG_DEBUG, "======= ==== ====");
+    SG_LOG( SG_ALL, SG_DEBUG, "Running Main Loop");
+    SG_LOG( SG_ALL, SG_DEBUG, "======= ==== ====");
 
 #ifdef FG_NETWORK_OLK
-    if ( current_options.get_network_olk() ) {
+    if ( fgGetBool("/sim/networking/network-olk") ) {
 	if ( net_is_registered == 0 ) {	     // We first have to reg. to fgd
 	    // printf("FGD: Netupdate\n");
 	    fgd_send_com( "A", FGFS_host);   // Send Mat4 data
@@ -758,7 +901,8 @@ static void fgMainLoop( void ) {
 
 #if defined( ENABLE_PLIB_JOYSTICK )
     // Read joystick and update control settings
-    if ( current_options.get_control_mode() == fgOPTIONS::FG_JOYSTICK ) {
+    if ( fgGetString("/sim/control-mode") == "joystick" )
+    {
 	fgJoystickRead();
     }
 #elif defined( ENABLE_GLUT_JOYSTICK )
@@ -776,32 +920,31 @@ static void fgMainLoop( void ) {
 
     /* printf("Before - ground = %.2f  runway = %.2f  alt = %.2f\n",
 	   scenery.cur_elev,
-	   cur_fdm_state->get_Runway_altitude() * FEET_TO_METER,
-	   cur_fdm_state->get_Altitude() * FEET_TO_METER); */
+	   cur_fdm_state->get_Runway_altitude() * SG_FEET_TO_METER,
+	   cur_fdm_state->get_Altitude() * SG_FEET_TO_METER); */
 
     if ( scenery.cur_elev > -9990 ) {
-	if ( cur_fdm_state->get_Altitude() * FEET_TO_METER < 
+	if ( cur_fdm_state->get_Altitude() * SG_FEET_TO_METER < 
 	     (scenery.cur_elev + alt_adjust_m - 3.0) ) {
 	    // now set aircraft altitude above ground
 	    printf("(*) Current Altitude = %.2f < %.2f forcing to %.2f\n", 
-		   cur_fdm_state->get_Altitude() * FEET_TO_METER,
+		   cur_fdm_state->get_Altitude() * SG_FEET_TO_METER,
 		   scenery.cur_elev + alt_adjust_m - 3.0,
 		   scenery.cur_elev + alt_adjust_m );
-	    fgFDMForceAltitude( current_options.get_flight_model(), 
+	    fgFDMForceAltitude( fgGetString("/sim/flight-model"), 
 				scenery.cur_elev + alt_adjust_m );
 
-	    FG_LOG( FG_ALL, FG_DEBUG, 
+	    SG_LOG( SG_ALL, SG_DEBUG, 
 		    "<*> resetting altitude to " 
-		    << cur_fdm_state->get_Altitude() * FEET_TO_METER << " meters" );
+		    << cur_fdm_state->get_Altitude() * SG_FEET_TO_METER
+		    << " meters" );
 	}
-	fgFDMSetGroundElevation( current_options.get_flight_model(),
-				 scenery.cur_elev );  // meters
     }
 
     /* printf("Adjustment - ground = %.2f  runway = %.2f  alt = %.2f\n",
 	   scenery.cur_elev,
-	   cur_fdm_state->get_Runway_altitude() * FEET_TO_METER,
-	   cur_fdm_state->get_Altitude() * FEET_TO_METER); */
+	   cur_fdm_state->get_Runway_altitude() * SG_FEET_TO_METER,
+	   cur_fdm_state->get_Altitude() * SG_FEET_TO_METER); */
 
     // update "time"
     if ( globals->get_warp_delta() != 0 ) {
@@ -819,12 +962,12 @@ static void fgMainLoop( void ) {
     // update magvar model
     globals->get_mag()->update( cur_fdm_state->get_Longitude(),
 				cur_fdm_state->get_Latitude(),
-				cur_fdm_state->get_Altitude()* FEET_TO_METER,
+				cur_fdm_state->get_Altitude()* SG_FEET_TO_METER,
 				globals->get_time_params()->getJD() );
 
     // Get elapsed time (in usec) for this past frame
     elapsed = fgGetTimeInterval();
-    FG_LOG( FG_ALL, FG_DEBUG, 
+    SG_LOG( SG_ALL, SG_DEBUG, 
 	    "Elapsed time interval is = " << elapsed 
 	    << ", previous remainder is = " << remainder );
 
@@ -850,7 +993,7 @@ static void fgMainLoop( void ) {
 #else
     if ( (t->get_cur_time() != last_time) && (last_time > 0) ) {
 	general.set_frame_rate( frames );
-	FG_LOG( FG_ALL, FG_DEBUG, 
+	SG_LOG( SG_ALL, SG_DEBUG, 
 		"--> Frame rate is = " << general.get_frame_rate() );
 	frames = 0;
     }
@@ -859,25 +1002,31 @@ static void fgMainLoop( void ) {
 #endif
 
     // Run flight model
-    if ( ! use_signals ) {
-	// Calculate model iterations needed for next frame
-	elapsed += remainder;
-
-	global_multi_loop = (int)(((double)elapsed * 0.000001) * 
-			   current_options.get_model_hz());
-	remainder = elapsed - ( (global_multi_loop*1000000) / 
-				current_options.get_model_hz() );
-	FG_LOG( FG_ALL, FG_DEBUG, 
-		"Model iterations needed = " << global_multi_loop
-		<< ", new remainder = " << remainder );
+
+    // Calculate model iterations needed for next frame
+    elapsed += remainder;
+
+    global_multi_loop = (long)(((double)elapsed * 0.000001) * 
+			      fgGetInt("/sim/model-hz"));
+    remainder = elapsed - ( (global_multi_loop*1000000) / 
+			    fgGetInt("/sim/model-hz") );
+    SG_LOG( SG_ALL, SG_DEBUG, 
+	    "Model iterations needed = " << global_multi_loop
+	    << ", new remainder = " << remainder );
 	
-	// flight model
-	if ( global_multi_loop > 0 ) {
-	    fgUpdateTimeDepCalcs(global_multi_loop, remainder);
-	} else {
-	    FG_LOG( FG_ALL, FG_DEBUG, 
-		    "Elapsed time is zero ... we're zinging" );
-	}
+    // chop max interations to something reasonable if the sim was
+    // delayed for an excesive amount of time
+    if ( global_multi_loop > 2.0 * fgGetInt("/sim/model-hz") ) {
+	global_multi_loop = (int)(2.0 * fgGetInt("/sim/model-hz") );
+	remainder = 0;
+    }
+
+    // flight model
+    if ( global_multi_loop > 0 ) {
+	fgUpdateTimeDepCalcs();
+    } else {
+	SG_LOG( SG_ALL, SG_DEBUG, 
+		"Elapsed time is zero ... we're zinging" );
     }
 
 #if ! defined( macintosh )
@@ -886,89 +1035,76 @@ static void fgMainLoop( void ) {
 #endif
 
     // see if we need to load any new scenery tiles
-    global_tile_mgr.update( cur_fdm_state->get_Longitude() * RAD_TO_DEG,
-			    cur_fdm_state->get_Latitude() * RAD_TO_DEG );
+    global_tile_mgr.update( cur_fdm_state->get_Longitude()
+                            * SGD_RADIANS_TO_DEGREES,
+			    cur_fdm_state->get_Latitude()
+                            * SGD_RADIANS_TO_DEGREES );
+
+    // see if we need to load any deferred-load textures
+    material_lib.load_next_deferred();
 
     // Process/manage pending events
     global_events.Process();
 
     // Run audio scheduler
 #ifdef ENABLE_AUDIO_SUPPORT
-    if ( current_options.get_sound() && !audio_sched->not_working() ) {
+    if ( fgGetBool("/sim/sound") && globals->get_soundmgr()->is_working() ) {
+	if ( fgGetString("/sim/aircraft") == "c172" ) {
+	    // pitch corresponds to rpm
+	    // volume corresponds to manifold pressure
 
-#   ifdef MICHAEL_JOHNSON_EXPERIMENTAL_ENGINE_AUDIO
+	    // cout << "AUDIO working = "
+	    //      << globals->get_soundmgr()->is_working() << endl;
 
-	static double kts_to_fts = NM_TO_METER * METER_TO_FEET / 3600.0;
+	    double rpm_factor;
+	    if ( cur_fdm_state->get_engine(0) != NULL ) {
+		rpm_factor = cur_fdm_state->get_engine(0)->get_RPM() / 2500.0;
+	    } else {
+		rpm_factor = 1.0;
+	    }
+	    // cout << "rpm = " << cur_fdm_state->get_engine(0)->get_RPM()
+	    //      << endl;
 
-	// note: all these factors are relative to the sample.  our
-	// sample format should really contain a conversion factor so
-	// that we can get prop speed right for arbitrary samples.
-	// Note that for normal-size props, there is a point at which
-	// the prop tips approach the speed of sound; that is a pretty
-	// strong limit to how fast the prop can go.
+	    double pitch = 0.3 + rpm_factor * 3.0;
+	
+	    // don't run at absurdly slow rates -- not realistic
+	    // and sounds bad to boot.  :-)
+	    if (pitch < 0.7) { pitch = 0.7; }
+	    if (pitch > 5.0) { pitch = 5.0; }
+
+	    double mp_factor;
+	    if ( cur_fdm_state->get_engine(0) != NULL ) {
+		mp_factor = 
+		    cur_fdm_state->get_engine(0)->get_Manifold_Pressure() / 100;
+	    } else {
+		mp_factor = 0.3;
+	    }
+	    /* cout << "mp = " 
+	         << cur_fdm_state->get_engine(0)->get_Manifold_Pressure()
+	         << endl; */
 
-	// multiplication factor is prime pitch control; add some log
-	// component for verisimilitude
+	    double volume = 0.15 + mp_factor / 2.0;
 
-	double pitch = log((controls.get_throttle(0) * 14.0) + 1.0);
-	//fprintf(stderr, "pitch1: %f ", pitch);
-	// if (controls.get_throttle(0) > 0.0 || 
-	//     cur_fdm_state->get_V_calibrated_kts() > 40.0) {
+	    if ( volume < 0.15 ) { volume = 0.15; }
+	    if ( volume > 0.5 ) { volume = 0.5; }
+	    // cout << "volume = " << volume << endl;
 
-	//fprintf(stderr, "rel_wind: %f ", cur_fdm_state->get_V_calibrated_kts());
-	// only add relative wind and AoA if prop is moving
-	// or we're really flying at idle throttle
-	if (pitch < 5.4) {  // this needs tuning
-	    // prop tips not breaking sound barrier
-	    pitch += log(cur_fdm_state->get_V_calibrated_kts() * kts_to_fts + 0.8)/2;
+	    s1->set_pitch( pitch );
+	    s1->set_volume( volume );
 	} else {
-	    // prop tips breaking sound barrier
-	    pitch += log(cur_fdm_state->get_V_calibrated_kts() * kts_to_fts + 0.8)/10;
+	    double param = controls.get_throttle( 0 ) * 2.0 + 1.0;
+	    s1->set_pitch( param );
+	    s1->set_volume( param );
 	}
-	//fprintf(stderr, "pitch2: %f ", pitch);
-	//fprintf(stderr, "AoA: %f ", FG_Gamma_vert_rad);
-
-	// Angle of Attack next... -x^3(e^x) is my best guess Just
-	// need to calculate some reasonable scaling factor and
-	// then clamp it on the positive aoa (neg adj) side
-	double aoa = cur_fdm_state->get_Gamma_vert_rad() * 2.2;
-	double tmp = 3.0;
-	double aoa_adj = pow(-aoa, tmp) * pow(M_E, aoa);
-	if (aoa_adj < -0.8) aoa_adj = -0.8;
-	pitch += aoa_adj;
-	//fprintf(stderr, "pitch3: %f ", pitch);
-
-	// don't run at absurdly slow rates -- not realistic
-	// and sounds bad to boot.  :-)
-	if (pitch < 0.8) pitch = 0.8;
-	// }
-	// fprintf(stderr, "pitch4: %f\n", pitch);
 
-	double volume = controls.get_throttle(0) * 0.1 + 0.3 +
-	    log(cur_fdm_state->get_V_calibrated_kts() * kts_to_fts + 1.0)/14.0;
-	if ( volume > 1.0 ) { volume = 1.0; }
-
-	// fprintf(stderr, "volume: %f\n", volume);
-
-	pitch_envelope.setStep  ( 0, 0.01, pitch );
-	volume_envelope.setStep ( 0, 0.01, volume );
-
-#   else
-
-       double param = controls.get_throttle( 0 ) * 2.0 + 1.0;
-       pitch_envelope.setStep  ( 0, 0.01, param );
-       volume_envelope.setStep ( 0, 0.01, param );
-
-#   endif // experimental throttle patch
-
-	audio_sched -> update();
+	globals->get_soundmgr()->update();
     }
 #endif
 
     // redraw display
     fgRenderFrame();
 
-    FG_LOG( FG_ALL, FG_DEBUG, "" );
+    SG_LOG( SG_ALL, SG_DEBUG, "" );
 }
 
 
@@ -985,7 +1121,7 @@ static void fgIdleFunction ( void ) {
 
     if ( idle_state == 0 ) {
 	// Initialize the splash screen right away
-	if ( current_options.get_splash_screen() ) {
+	if ( fgGetBool("/sim/startup/splash-screen") ) {
 	    fgSplashInit();
 	}
 	
@@ -993,15 +1129,15 @@ static void fgIdleFunction ( void ) {
     } else if ( idle_state == 1 ) {
 	// Start the intro music
 #if !defined(WIN32)
-	if ( current_options.get_intro_music() ) {
+	if ( fgGetBool("/sim/startup/intro-music") ) {
 	    string lockfile = "/tmp/mpg123.running";
-	    FGPath mp3file( current_options.get_fg_root() );
+	    SGPath mp3file( globals->get_fg_root() );
 	    mp3file.append( "Sounds/intro.mp3" );
 
 	    string command = "(touch " + lockfile + "; mpg123 "
 		+ mp3file.str() + "> /dev/null 2>&1; /bin/rm "
 		+ lockfile + ") &";
-	    FG_LOG( FG_GENERAL, FG_INFO, 
+	    SG_LOG( SG_GENERAL, SG_INFO, 
 		    "Starting intro music: " << mp3file.str() );
 	    system ( command.c_str() );
 	}
@@ -1022,10 +1158,10 @@ static void fgIdleFunction ( void ) {
     } else if ( idle_state == 3 ) {
 	// This is the top level init routine which calls all the
 	// other subsystem initialization routines.  If you are adding
-	// a subsystem to flight gear, its initialization call should
+	// a subsystem to flightgear, its initialization call should
 	// located in this routine.
 	if( !fgInitSubsystems()) {
-	    FG_LOG( FG_GENERAL, FG_ALERT,
+	    SG_LOG( SG_GENERAL, SG_ALERT,
 		    "Subsystem initializations failed ..." );
 	    exit(-1);
 	}
@@ -1035,12 +1171,6 @@ static void fgIdleFunction ( void ) {
 	// setup OpenGL view parameters
 	fgInitVisuals();
 
-	if ( use_signals ) {
-	    // init timer routines, signals, etc.  Arrange for an alarm
-	    // signal to be generated, etc.
-	    fgInitTimeDepCalcs();
-	}
-
 	idle_state++;
     } else if ( idle_state == 5 ) {
 
@@ -1050,62 +1180,49 @@ static void fgIdleFunction ( void ) {
 #ifdef ENABLE_AUDIO_SUPPORT
 
 #if !defined(WIN32)
-	if ( current_options.get_intro_music() ) {
+	if ( fgGetBool("/sim/startup/intro-music") ) {
 	    // Let's wait for mpg123 to finish
 	    string lockfile = "/tmp/mpg123.running";
 	    struct stat stat_buf;
 
-	    FG_LOG( FG_GENERAL, FG_INFO, 
+	    SG_LOG( SG_GENERAL, SG_INFO, 
 		    "Waiting for mpg123 player to finish ..." );
 	    while ( stat(lockfile.c_str(), &stat_buf) == 0 ) {
 		// file exist, wait ...
 		sleep(1);
-		FG_LOG( FG_GENERAL, FG_INFO, ".");
+		SG_LOG( SG_GENERAL, SG_INFO, ".");
 	    }
-	    FG_LOG( FG_GENERAL, FG_INFO, "");
+	    SG_LOG( SG_GENERAL, SG_INFO, "");
 	}
 #endif // WIN32
 
-	if ( current_options.get_sound() ) {
-	    audio_sched = new slScheduler ( 8000 );
-	    audio_mixer = new smMixer;
-	    audio_mixer -> setMasterVolume ( 80 ) ;  /* 80% of max volume. */
-	    audio_sched -> setSafetyMargin ( 1.0 ) ;
-
-	    FGPath slfile( current_options.get_fg_root() );
-	    slfile.append( "Sounds/wasp.wav" );
-
-	    s1 = new slSample ( (char *)slfile.c_str() );
-	    FG_LOG( FG_GENERAL, FG_INFO,
-		    "Rate = " << s1 -> getRate()
-		    << "  Bps = " << s1 -> getBps()
-		    << "  Stereo = " << s1 -> getStereo() );
-	    audio_sched -> loopSample ( s1 );
-
-	    if ( audio_sched->not_working() ) {
-		// skip
-	    } else {
-		pitch_envelope.setStep  ( 0, 0.01, 0.6 );
-		volume_envelope.setStep ( 0, 0.01, 0.6 );
-
-		audio_sched -> addSampleEnvelope( s1, 0, 0, 
-						  &pitch_envelope,
-						  SL_PITCH_ENVELOPE );
-		audio_sched -> addSampleEnvelope( s1, 0, 1, 
-						  &volume_envelope,
-						  SL_VOLUME_ENVELOPE );
-	    }
-
-	    // strcpy(slfile, path);
-	    // strcat(slfile, "thunder.wav");
-	    // s2 -> loadFile ( slfile );
-	    // s2 -> adjustVolume(0.5);
-	    // audio_sched -> playSample ( s2 );
+	if ( fgGetBool("/sim/sound") ) {
+	    globals->get_soundmgr()->init();
+
+	    s1 = new FGSimpleSound( fgGetString("/sim/sounds/engine",
+						"Sounds/wasp.wav") );
+	    globals->get_soundmgr()->add( s1, "engine loop" );
+	    globals->get_soundmgr()->play_looped( "engine loop" );
+	    SG_LOG( SG_GENERAL, SG_INFO,
+		    "Rate = " << s1->get_sample()->getRate()
+		    << "  Bps = " << s1->get_sample()->getBps()
+		    << "  Stereo = " << s1->get_sample()->getStereo() );
+
+	    s2 = new FGSimpleSound( "Sounds/corflaps.wav" );
+	    // FGMorse mmm;
+	    // mmm.init();
+	    // s2 = mmm.make_ident( "JLI" );
+	    s2->set_volume( 0.3 );
+	    globals->get_soundmgr()->add( s2, "flaps" );
 	}
 #endif
 
 	// sleep(1);
 	idle_state = 1000;
+
+	cout << "Panel visible = " << fgPanelVisible() << endl;
+	fgReshape( fgGetInt("/sim/startup/xsize"),
+		   fgGetInt("/sim/startup/ysize") );
     } 
 
     if ( idle_state == 1000 ) {
@@ -1114,7 +1231,7 @@ static void fgIdleFunction ( void ) {
 
 	fgMainLoop();
     } else {
-	if ( current_options.get_splash_screen() == 1 ) {
+	if ( fgGetBool("/sim/startup/splash-screen") ) {
 	    fgSplashUpdate(0.0);
 	}
     }
@@ -1123,37 +1240,38 @@ static void fgIdleFunction ( void ) {
 // options.cxx needs to see this for toggle_panel()
 // Handle new window size or exposure
 void fgReshape( int width, int height ) {
-    if ( ! current_options.get_panel_status() || idle_state != 1000 ) {
-	current_view.set_win_ratio( height / width );
+    // for all views
+    for ( int i = 0; i < globals->get_viewmgr()->size(); ++i ) {
+	if ( ! fgPanelVisible() || idle_state != 1000 ) {
+	    globals->get_viewmgr()->get_view(i)->
+		set_win_ratio( (float)height / (float)width );
+	} else {
+	    int view_h =
+		int((current_panel->getViewHeight() -
+		     current_panel->getYOffset())
+		    * (height / 768.0)) + 1;
+	    globals->get_viewmgr()->get_view(i)->
+		set_win_ratio( (float)view_h / (float)width );
+	}
+    }
+
+    if ( ! fgPanelVisible() || idle_state != 1000 ) {
 	glViewport(0, 0 , (GLint)(width), (GLint)(height) );
     } else {
-	current_view.set_win_ratio( (height*0.4232) / width );
-	glViewport(0, (GLint)((height)*0.5768),
-		   (GLint)(width), (GLint)((height)*0.4232) );
+        int view_h =
+	    int((current_panel->getViewHeight() - current_panel->getYOffset())
+		* (height / 768.0)) + 1;
+	glViewport(0, (GLint)(height - view_h),
+		   (GLint)(width), (GLint)(view_h) );
     }
 
-    current_view.set_winWidth( width );
-    current_view.set_winHeight( height );
-    current_view.force_update_fov_math();
+    fgSetInt("/sim/startup/xsize", width);
+    fgSetInt("/sim/startup/ysize", height);
 
-    // set these fov to be the same as in fgRenderFrame()
-    // float x_fov = current_options.get_fov();
-    // float y_fov = x_fov * 1.0 / current_view.get_win_ratio();
-    // ssgSetFOV( x_fov, y_fov );
-
-    // glViewport ( 0, 0, width, height );
-    float fov = current_options.get_fov();
-    // ssgSetFOV(fov * current_view.get_win_ratio(), fov);
-    ssgSetFOV(fov, fov * current_view.get_win_ratio());
+    float fov = globals->get_current_view()->get_fov();
+    ssgSetFOV(fov, fov * globals->get_current_view()->get_win_ratio());
 
     fgHUDReshape();
-
-    if ( idle_state == 1000 ) {
-	// yes we've finished all our initializations and are running
-	// the main loop, so this will now work without seg faulting
-	// the system.
-	current_view.UpdateViewParams(cur_view_fdm);
-    }
 }
 
 
@@ -1169,27 +1287,28 @@ int fgGlutInit( int *argc, char **argv ) {
     // Define Display Parameters
     glutInitDisplayMode( GLUT_RGB | GLUT_DEPTH | GLUT_DOUBLE );
 
-    FG_LOG( FG_GENERAL, FG_INFO, "Opening a window: " <<
-	    current_options.get_xsize() << "x" << current_options.get_ysize() );
+    SG_LOG( SG_GENERAL, SG_INFO, "Opening a window: " <<
+	    fgGetInt("/sim/startup/xsize") << "x"
+	    << fgGetInt("/sim/startup/ysize") );
 
     // Define initial window size
-    glutInitWindowSize( current_options.get_xsize(),
-			 current_options.get_ysize() );
+    glutInitWindowSize( fgGetInt("/sim/startup/xsize"),
+			fgGetInt("/sim/startup/ysize") );
 
     // Initialize windows
-    if ( current_options.get_game_mode() == 0 ) {
+    if ( !fgGetBool("/sim/startup/game-mode")) {
 	// Open the regular window
-	glutCreateWindow("Flight Gear");
+	glutCreateWindow("FlightGear");
 #ifndef GLUT_WRONG_VERSION
     } else {
 	// Open the cool new 'game mode' window
 	char game_mode_str[256];
 	sprintf( game_mode_str, "width=%d height=%d bpp=%d",
-		 current_options.get_xsize(),
-		 current_options.get_ysize(),
-		 current_options.get_bpp());
+		 fgGetInt("/sim/startup/xsize"),
+		 fgGetInt("/sim/startup/ysize"),
+		 fgGetInt("/sim/rendering/bits-per-pixel"));
 
-	FG_LOG( FG_GENERAL, FG_INFO, 
+	SG_LOG( SG_GENERAL, SG_INFO, 
 		"game mode params = " << game_mode_str );
 	glutGameModeString( game_mode_str );
 	glutEnterGameMode();
@@ -1202,49 +1321,18 @@ int fgGlutInit( int *argc, char **argv ) {
     general.set_glVendor( (char *)glGetString ( GL_VENDOR ) );
     general.set_glRenderer( (char *)glGetString ( GL_RENDERER ) );
     general.set_glVersion( (char *)glGetString ( GL_VERSION ) );
-    int tmp;
+    SG_LOG( SG_GENERAL, SG_INFO, general.get_glRenderer() );
+
+    GLint tmp;
     glGetIntegerv( GL_MAX_TEXTURE_SIZE, &tmp );
     general.set_glMaxTexSize( tmp );
-    FG_LOG ( FG_GENERAL, FG_INFO, general.get_glRenderer() );
-    FG_LOG ( FG_GENERAL, FG_INFO, "Max texture size = " << tmp );
+    SG_LOG ( SG_GENERAL, SG_INFO, "Max texture size = " << tmp );
 
-#if 0
-    // try to determine if we should adjust the initial default
-    // display resolution.  The options class defaults (is
-    // initialized) to 640x480.
-    string renderer = general.glRenderer;
-
-    // currently we only know how to deal with Mesa/Glide/Voodoo cards
-    if ( renderer.find( "Glide" ) != string::npos ) {
-	FG_LOG( FG_GENERAL, FG_INFO, "Detected a Glide driver" );
-	if ( renderer.find( "FB/8" ) != string::npos ) {
-	    // probably a voodoo-2
-	    if ( renderer.find( "TMU/SLI" ) != string::npos ) {
-		// probably two SLI'd Voodoo-2's
-		current_options.set_xsize( 1024 );
-		current_options.set_ysize( 768 );
-		FG_LOG( FG_GENERAL, FG_INFO,
-			"It looks like you have two sli'd voodoo-2's." << endl
-			<< "upgrading your win resolution to 1024 x 768" );
-		glutReshapeWindow(1024, 768);
-	    } else {
-		// probably a single non-SLI'd Voodoo-2
-		current_options.set_xsize( 800 );
-		current_options.set_ysize( 600 );
-		FG_LOG( FG_GENERAL, FG_INFO,
-			"It looks like you have a voodoo-2." << endl
-			<< "upgrading your win resolution to 800 x 600" );
-		glutReshapeWindow(800, 600);
-	    }
-	} else if ( renderer.find( "FB/2" ) != string::npos ) {
-	    // probably a voodoo-1, stick with the default
-	}
-    } else {
-	// we have no special knowledge of this card, stick with the default
-    }
-#endif
+    glGetIntegerv( GL_DEPTH_BITS, &tmp );
+    general.set_glDepthBits( tmp );
+    SG_LOG ( SG_GENERAL, SG_INFO, "Depth buffer bits = " << tmp );
 
-    return(1);
+    return 1;
 }
 
 
@@ -1287,48 +1375,70 @@ int main( int argc, char **argv ) {
 #endif
 
     // set default log levels
-    fglog().setLogLevels( FG_ALL, FG_INFO );
+    sglog().setLogLevels( SG_ALL, SG_INFO );
+
+    string version;
+#ifdef FLIGHTGEAR_VERSION
+    version = FLIGHTGEAR_VERSION;
+#else
+    version = "unknown version";
+#endif
+    SG_LOG( SG_GENERAL, SG_INFO, "FlightGear:  Version "
+	    << version << endl );
+
+    // Allocate global data structures.  This needs to happen before
+    // we parse command line options
 
-    FG_LOG( FG_GENERAL, FG_INFO, "Flight Gear:  Version " << VERSION << endl );
+    globals = new FGGlobals;
 
     // seed the random number generater
-    fg_srandom();
-
-    // Read global preferences from $FG_ROOT/preferences.xml
-    // FIXME: this will *not* work with an --fg_root option because
-    // we have not read the command-line yet.  Suggestions?
-
-    FGPath props_path(current_options.get_fg_root());
-    props_path.append("preferences.xml");
-    FG_LOG(FG_INPUT, FG_INFO, "Reading global preferences");
-    if (!readPropertyList(props_path.str(), &current_properties)) {
-      FG_LOG(FG_INPUT, FG_ALERT, "Failed to read global preferences from "
-	     << props_path.str());
-    } else {
-      FG_LOG(FG_INPUT, FG_INFO, "Finished Reading global preferences");
-    }
+    sg_srandom_time();
+
+    SGRoute *route = new SGRoute;
+    globals->set_route( route );
+
+#ifdef ENABLE_AUDIO_SUPPORT
+    FGSoundMgr *soundmgr = new FGSoundMgr;
+    globals->set_soundmgr( soundmgr );
+#endif
+
+    FGViewMgr *viewmgr = new FGViewMgr;
+    globals->set_viewmgr( viewmgr );
+
+    FGViewerRPH *pv = new FGViewerRPH;
+    globals->get_viewmgr()->add_view( pv );
+
+    FGViewerLookAt *chase = new FGViewerLookAt;
+    globals->get_viewmgr()->add_view( chase );
+
+    string_list *col = new string_list;
+    globals->set_channel_options_list( col );
+
+    // set current view to 0 (first) which is our main pilot view
+    globals->set_current_view( globals->get_viewmgr()->get_view( 0 ) );
+
+    // Scan the config file(s) and command line options to see if
+    // fg_root was specified (ignore all other options for now)
+    fgInitFGRoot(argc, argv);
 
     // Initialize the Aircraft directory to "" (UIUC)
     aircraft_dir = "";
 
-    // needs to happen before we parse command line options
-    globals = new FGGlobals;
-
     // Load the configuration parameters
     if ( !fgInitConfig(argc, argv) ) {
-	FG_LOG( FG_GENERAL, FG_ALERT, "Config option parsing failed ..." );
+	SG_LOG( SG_GENERAL, SG_ALERT, "Config option parsing failed ..." );
 	exit(-1);
     }
 
     // Initialize the Window/Graphics environment.
     if( !fgGlutInit(&argc, argv) ) {
-	FG_LOG( FG_GENERAL, FG_ALERT, "GLUT initialization failed ..." );
+	SG_LOG( SG_GENERAL, SG_ALERT, "GLUT initialization failed ..." );
 	exit(-1);
     }
 
     // Initialize the various GLUT Event Handlers.
     if( !fgGlutInitEvents() ) {
- 	FG_LOG( FG_GENERAL, FG_ALERT, 
+ 	SG_LOG( SG_GENERAL, SG_ALERT, 
  		"GLUT event handler initialization failed ..." );
  	exit(-1);
     }
@@ -1342,18 +1452,33 @@ int main( int argc, char **argv ) {
     // fonts !!!
     guiInit();
 
+#ifdef GL_EXT_texture_lod_bias
+    glTexEnvf( GL_TEXTURE_FILTER_CONTROL_EXT, GL_TEXTURE_LOD_BIAS_EXT, -0.5 ) ;
+#endif
+
+#if 0
+#ifdef GL_EXT_texture_filter_anisotropic
+    float max_anisotropy;
+    glGetFloatv( GL_MAX_TEXTURE_MAX_ANISOTROPY_EXT, &max_anisotropy );
+    glTexParameterf( GL_TEXTURE_2D, GL_TEXTURE_MAX_ANISOTROPY_EXT,
+                     max_anisotropy );
+    cout << "Max anisotropy = " << max_anisotropy << endl;
+#endif
+#endif
+
     // set current_options lon/lat if an airport id is specified
-    if ( current_options.get_airport_id().length() ) {
-	// fgSetPosFromAirportID( current_options.get_airport_id() );
-	fgSetPosFromAirportIDandHdg( current_options.get_airport_id(),
-				     current_options.get_heading() );
+    // cout << "3. airport_id = " << fgGetString("/sim/startup/airport-id") << endl;
+    if ( fgGetString("/sim/startup/airport-id").length() ) {
+	// fgSetPosFromAirportID( fgGetString("/sim/startup/airport-id") );
+	fgSetPosFromAirportIDandHdg( fgGetString("/sim/startup/airport-id"),
+				     fgGetDouble("/orientation/heading") );
     }
 
     // Initialize time
-    FGPath zone( current_options.get_fg_root() );
+    SGPath zone( globals->get_fg_root() );
     zone.append( "Timezone" );
-    SGTime *t = new SGTime( current_options.get_lon() * DEG_TO_RAD,
-			    current_options.get_lat() * DEG_TO_RAD,
+    SGTime *t = new SGTime( fgGetDouble("/position/longitude") * SGD_DEGREES_TO_RADIANS,
+			    fgGetDouble("/position/latitude") * SGD_DEGREES_TO_RADIANS,
 			    zone.str() );
 
     // Handle potential user specified time offsets
@@ -1364,36 +1489,28 @@ int main( int argc, char **argv ) {
 	sgTimeGetGMT( fgLocaltime(&cur_time, t->get_zonename() ) );
 
     // Okay, we now have six possible scenarios
-    switch ( current_options.get_time_offset_type() ) {
-    case fgOPTIONS::FG_TIME_SYS_OFFSET:
-	globals->set_warp( current_options.get_time_offset() );
-	break;
-    case fgOPTIONS::FG_TIME_GMT_OFFSET:
-	globals->set_warp( current_options.get_time_offset() - 
-			   (currGMT - systemLocalTime) );
-	break;
-    case fgOPTIONS::FG_TIME_LAT_OFFSET:
-	globals->set_warp( current_options.get_time_offset() - 
-			   (aircraftLocalTime - systemLocalTime) );
-	break;
-    case fgOPTIONS::FG_TIME_SYS_ABSOLUTE:
-	globals->set_warp( current_options.get_time_offset() - cur_time );
-	//printf("warp = %d\n", warp); 
-	break;
-    case fgOPTIONS::FG_TIME_GMT_ABSOLUTE:
-	globals->set_warp( current_options.get_time_offset() - currGMT );
-	break;
-    case fgOPTIONS::FG_TIME_LAT_ABSOLUTE:
-	globals->set_warp( current_options.get_time_offset() - 
-			   (aircraftLocalTime - systemLocalTime) - 
+    int offset = fgGetInt("/sim/startup/time-offset");
+    const string &offset_type = fgGetString("/sim/startup/time-offset-type");
+    if (offset_type == "system-offset") {
+	globals->set_warp( offset );
+    } else if (offset_type == "gmt-offset") {
+	globals->set_warp( offset - (currGMT - systemLocalTime) );
+    } else if (offset_type == "latitude-offset") {
+	globals->set_warp( offset - (aircraftLocalTime - systemLocalTime) );
+    } else if (offset_type == "system") {
+	globals->set_warp( offset - cur_time );
+    } else if (offset_type == "gmt") {
+	globals->set_warp( offset - currGMT );
+    } else if (offset_type == "latitude") {
+	globals->set_warp( offset - (aircraftLocalTime - systemLocalTime) - 
 			   cur_time ); 
-	break;
-    default:
-	FG_LOG( FG_GENERAL, FG_ALERT, "Unsupported type" );
+    } else {
+        SG_LOG( SG_GENERAL, SG_ALERT,
+		"Unsupported offset type " << offset_type );
 	exit( -1 );
     }
 
-    FG_LOG( FG_GENERAL, FG_INFO, "After time init, warp = " 
+    SG_LOG( SG_GENERAL, SG_INFO, "After time init, warp = " 
 	    << globals->get_warp() );
 
     globals->set_warp_delta( 0 );
@@ -1404,33 +1521,23 @@ int main( int argc, char **argv ) {
 
     // Do some quick general initializations
     if( !fgInitGeneral()) {
-	FG_LOG( FG_GENERAL, FG_ALERT, 
+	SG_LOG( SG_GENERAL, SG_ALERT, 
 		"General initializations failed ..." );
 	exit(-1);
     }
 
-    //
-    // some ssg test stuff (requires data from the plib source
-    // distribution) specifically from the ssg tux example
-    //
-
-    FGPath modelpath( current_options.get_fg_root() );
-    modelpath.append( "Models" );
-    modelpath.append( "Geometry" );
-  
-    FGPath texturepath( current_options.get_fg_root() );
-    texturepath.append( "Models" );
-    texturepath.append( "Textures" );
-  
+    SGPath modelpath( globals->get_fg_root() );
     ssgModelPath( (char *)modelpath.c_str() );
-    ssgTexturePath( (char *)texturepath.c_str() );
-
+  
     // Scene graph root
     scene = new ssgRoot;
     scene->setName( "Scene" );
 
+    lighting = new ssgRoot;
+    lighting->setName( "Lighting" );
+
     // Initialize the sky
-    FGPath ephem_data_path( current_options.get_fg_root() );
+    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(),
@@ -1438,10 +1545,11 @@ int main( int argc, char **argv ) {
 		   0.0 );
     globals->set_ephem( ephem );
 
-    FGPath sky_tex_path( current_options.get_fg_root() );
+    thesky = new SGSky;
+
+    SGPath sky_tex_path( globals->get_fg_root() );
     sky_tex_path.append( "Textures" );
     sky_tex_path.append( "Sky" );
-    thesky = new SGSky;
     thesky->texture_path( sky_tex_path.str() );
 
     thesky->build( 550.0, 550.0,
@@ -1450,14 +1558,16 @@ int main( int argc, char **argv ) {
 		   globals->get_ephem()->getNumStars(),
 		   globals->get_ephem()->getStars(), 60000.0 );
 
-    thesky->add_cloud_layer( 2600.0, 200.0, 50.0, 40000.0,
-			     SG_CLOUD_MOSTLY_SUNNY );
-    thesky->add_cloud_layer( 6000.0, 20.0, 10.0, 40000.0,
-			     SG_CLOUD_CIRRUS );
-
-    // thesky->add_cloud_layer( 1000.0, 200.0, 50.0, SG_CLOUD_MOSTLY_SUNNY );
-    // thesky->add_cloud_layer( 1800.0, 400.0, 100.0, SG_CLOUD_OVERCAST );
-    // thesky->add_cloud_layer( 5000.0, 20.0, 10.0, SG_CLOUD_CIRRUS );
+    if ( fgGetBool("/environment/clouds/status") ) {
+	// thesky->add_cloud_layer( 2000.0, 200.0, 50.0, 40000.0,
+        //                          SG_CLOUD_OVERCAST );
+	thesky->add_cloud_layer( 2600.0, 200.0, 50.0, 40000.0,
+				 SG_CLOUD_MOSTLY_CLOUDY );
+	// thesky->add_cloud_layer( 3000.0, 200.0, 50.0, 40000.0,
+	//                          SG_CLOUD_MOSTLY_SUNNY );
+	thesky->add_cloud_layer( 6000.0, 20.0, 10.0, 40000.0,
+				 SG_CLOUD_CIRRUS );
+    }
 
     // Initialize MagVar model
     SGMagVar *magvar = new SGMagVar();
@@ -1468,23 +1578,97 @@ int main( int argc, char **argv ) {
     terrain->setName( "Terrain" );
     scene->addKid( terrain );
 
+    // Lighting
+    ground = new ssgBranch;
+    ground->setName( "Ground Lighting" );
+    lighting->addKid( ground );
+
+    airport = new ssgBranch;
+    airport->setName( "Airport Lighting" );
+    lighting->addKid( airport );
+
     // temporary visible aircraft "own ship"
-    penguin_sel = new ssgSelector;
-    penguin_pos = new ssgTransform;
-    // ssgBranch *tux_obj = ssgMakeSphere( 10.0, 10, 10 );
-    ssgEntity *tux_obj = ssgLoadAC( "glider.ac" );
-    // ssgEntity *tux_obj = ssgLoadAC( "Tower1x.ac" );
-
-    penguin_pos->addKid( tux_obj );
-    penguin_sel->addKid( penguin_pos );
-    ssgFlatten( tux_obj );
-    ssgStripify( penguin_sel );
-    penguin_sel->clrTraversalMaskBits( SSGTRAV_HOT );
-    scene->addKid( penguin_sel );
+    acmodel_selector = new ssgSelector;
+    acmodel_pos = new ssgTransform;
+
+    // Get the model location, and load textures from the same
+    // directory.  Use an absolute path for the model to avoid
+    // incompatibilities in different versions of PLIB.
+    string acmodel_path =
+	fgGetString("/sim/model/path", "Models/Geometry/glider.ac");
+    SGPath full_model = globals->get_fg_root();
+    full_model.append(acmodel_path);
+
+#if !defined( PLIB_1_2_X )
+    // this should be redundant ... but it breaks for relative paths
+    // ssgModelPath( (char *)full_model.dir().c_str() );
+#endif
+
+    ssgTexturePath( (char *)full_model.dir().c_str() );
+    ssgEntity *acmodel_obj = ssgLoad( (char *)full_model.c_str() );
+    if( !acmodel_obj ) {
+        // fall back to default
+        acmodel_obj = ssgLoad( (char *)"Models/Geometry/glider.ac" );
+        if( !acmodel_obj ) {
+            SG_LOG( SG_GENERAL, SG_ALERT, "FAILED to LOAD an AC model! ..." );
+            exit(-1);
+        }
+    }
+
+    // find moving parts (if this is an MDL model)
+    flaps_selector = (ssgSelector*)fgFindNode( acmodel_obj, "FLAPS" );
+    prop_selector  = (ssgSelector*)fgFindNode( acmodel_obj, "PROP"  );
+
+    acmodel_npropsettings = 0;
+    if (prop_selector != NULL) {
+      for (ssgEntity* kid = prop_selector->getKid(0); kid != NULL;
+	   kid = prop_selector->getNextKid()) {
+	int prop_low, prop_high;
+	if ( sscanf(kid->getName(), "PROP_%d_%d", 
+		    &prop_low, &prop_high) == 2 ) {
+	  prop_low  = (int)((float)prop_low  * (5000.0f / 32767.0f));
+	  prop_high = (int)((float)prop_high * (5000.0f / 32767.0f));
+	  acmodel_proprpms[acmodel_npropsettings][0] = prop_low ;
+	  acmodel_proprpms[acmodel_npropsettings][1] = prop_high;
+	  acmodel_npropsettings++;
+
+	  SG_LOG( SG_GENERAL, SG_INFO, "PROPELLER SETTING " << prop_low <<
+		  " " << prop_high );
+	}
+      }
+    }
+
+    // align the model properly for FGFS
+    ssgTransform *acmodel_align = new ssgTransform;
+    acmodel_align->addKid(acmodel_obj);
+    sgMat4 rot_matrix;
+    sgMat4 off_matrix;
+    sgMat4 res_matrix;
+    float h_rot = fgGetFloat("/sim/model/h-rotation", 0.0);
+    float p_rot = fgGetFloat("/sim/model/p-rotation", 0.0);
+    float r_rot = fgGetFloat("/sim/model/r-rotation", 0.0);
+    float x_off = fgGetFloat("/sim/model/x-offset", 0.0);
+    float y_off = fgGetFloat("/sim/model/y-offset", 0.0);
+    float z_off = fgGetFloat("/sim/model/z-offset", 0.0);
+    sgMakeRotMat4(rot_matrix, h_rot, p_rot, r_rot);
+    sgMakeTransMat4(off_matrix, x_off, y_off, z_off);
+    sgMultMat4(res_matrix, off_matrix, rot_matrix);
+    acmodel_align->setTransform(res_matrix);
+
+    acmodel_pos->addKid( acmodel_align );
+    acmodel_selector->addKid( acmodel_pos );
+    //ssgFlatten( acmodel_obj );
+    //ssgStripify( acmodel_selector );
+    acmodel_selector->clrTraversalMaskBits( SSGTRAV_HOT );
+    scene->addKid( acmodel_selector );
+
+    // $$$ begin - added VS Renganthan 17 Oct 2K
+    fgLoadDCS();
+    // $$$ end - added VS Renganthan 17 Oct 2K
 
 #ifdef FG_NETWORK_OLK
     // Do the network intialization
-    if ( current_options.get_network_olk() ) {
+    if ( fgGetBool("/sim/networking/network-olk") ) {
 	printf("Multipilot mode %s\n", fg_net_init( scene ) );
     }
 #endif
@@ -1499,3 +1683,156 @@ int main( int argc, char **argv ) {
     // etc.
     return 0;
 }
+
+
+// $$$ end - added VS Renganathan, 15 Oct 2K
+//         - added Venky         , 12 Nov 2K
+
+void fgLoadDCS(void) {
+
+    ssgEntity *ship_obj = NULL;
+    // double bz[3];
+    // int j=0;
+    char obj_filename[25];
+
+    for ( int k = 0; k < 32; k++ ) {
+        ship_pos[k]=NULL;
+    }
+
+    SGPath tile_path( globals->get_fg_root());
+    tile_path.append( "Scenery" );
+    tile_path.append( "Objects.txt" );
+    sg_gzifstream in( tile_path.str() );
+    if ( ! in.is_open() ) {
+	SG_LOG( SG_TERRAIN, SG_ALERT, "Cannot open file: " << tile_path.str() );
+    } else {
+
+        SGPath modelpath( globals->get_fg_root() );
+        modelpath.append( "Models" );
+        modelpath.append( "Geometry" );
+  
+        SGPath texturepath( globals->get_fg_root() );
+        texturepath.append( "Models" );
+        texturepath.append( "Textures" );
+ 
+        ssgModelPath( (char *)modelpath.c_str() );
+        ssgTexturePath( (char *)texturepath.c_str() );
+
+        ship_sel = new ssgSelector;
+
+        char c;
+        while ( ! in.eof() ) {
+            in >> ::skipws;
+            if ( in.get( c ) && c == '#' ) { 
+                in >> skipeol;
+            } else { 
+                in.putback(c);
+                in >> obj_filename >> obj_lat[objc] >> obj_lon[objc] >> obj_alt[objc];
+                /* cout << endl << obj_filename << " " << obj_lat[objc] << " " << obj_lon[objc] <<  " " << obj_alt[objc] << endl;
+                   int chj=getchar();*/
+                
+                obj_lon[objc] *=SGD_DEGREES_TO_RADIANS;
+                obj_lat[objc] *=SGD_DEGREES_TO_RADIANS;
+                
+                ship_pos[objc] = new ssgTransform;
+       
+                // type "repeat" in objects.txt to load one more
+                // instance of the last object.
+
+                if ( strcmp(obj_filename,"repeat") != 0) {
+                    ship_obj = ssgLoadOBJ( obj_filename );
+                }
+      
+                if ( ship_obj != NULL ) {
+                    ship_pos[objc]->addKid( ship_obj ); // add object to transform node
+                    ship_sel->addKid( ship_pos[objc] ); // add transform node to selector
+                } else {
+                    SG_LOG( SG_TERRAIN, SG_ALERT, "Cannot open file: "
+                            << obj_filename );
+                }
+            
+                objc++;
+
+                if (in.eof()) break;
+            }
+        } // while
+
+        SG_LOG ( SG_TERRAIN, SG_ALERT, "Finished object processing." );
+
+        ship_sel->clrTraversalMaskBits( SSGTRAV_HOT );
+        scene->addKid( ship_sel ); //add selector node to root node 
+    }
+
+    return;
+ }
+
+
+void fgUpdateDCS (void) {
+
+    // double eye_lat,eye_lon,eye_alt;
+    // static double obj_head;
+    double sl_radius,obj_latgc;
+    // float nresultmat[4][4];
+    // sgMat4 Trans,rothead,rotlon,rot180,rotlat,resultmat1,resultmat2,resultmat3;
+    double bz[3];
+
+    // Instantaneous Geodetic Lat/Lon/Alt of moving object
+    FGADA *fdm = (FGADA *)current_aircraft.fdm_state;
+    
+    // Deck should be the first object in objects.txt in case of fdm=ada
+
+    if (fgGetString("/sim/flight-model") == "ada") {
+        obj_lon[0] = fdm->get_aux5()*SGD_DEGREES_TO_RADIANS;
+        obj_lat[0] = fdm->get_aux6()*SGD_DEGREES_TO_RADIANS;
+        obj_alt[0] = fdm->get_aux7();
+    }
+    
+    for ( int m = 0; m < objc; m++ ) {
+    	//cout << endl <<  obj_lat[m]*SGD_RADIANS_TO_DEGREES << " " << obj_lon[m]*SGD_RADIANS_TO_DEGREES << " " << obj_alt[m] << " " << objc << endl;
+	//int v=getchar();
+
+        //Geodetic to Geocentric angles for rotation
+	sgGeodToGeoc(obj_lat[m],obj_alt[m],&sl_radius,&obj_latgc);
+
+        //moving object gbs-posn in cartesian coords
+        Point3D obj_posn = Point3D( obj_lon[m],obj_lat[m],obj_alt[m]);
+        Point3D obj_pos = sgGeodToCart( obj_posn );
+
+        // Translate moving object w.r.t eye
+        Point3D Objtrans = obj_pos-scenery.center;
+        bz[0]=Objtrans.x();
+        bz[1]=Objtrans.y();
+        bz[2]=Objtrans.z();
+
+       // rotate dynamic objects for lat,lon & alt and other motion about its axes
+	
+	sgMat4 sgTRANS;
+	sgMakeTransMat4( sgTRANS, bz[0],bz[1],bz[2]);
+
+	sgVec3 ship_fwd,ship_rt,ship_up;
+	sgSetVec3( ship_fwd, 1.0, 0.0, 0.0);//east,roll
+	sgSetVec3( ship_rt, 0.0, 1.0, 0.0);//up,pitch
+	sgSetVec3( ship_up, 0.0, 0.0, 1.0); //north,yaw
+
+	sgMat4 sgROT_lon, sgROT_lat, sgROT_hdg;
+	sgMakeRotMat4( sgROT_lon, obj_lon[m]*SGD_RADIANS_TO_DEGREES, ship_up );
+	sgMakeRotMat4( sgROT_lat, 90-obj_latgc*SGD_RADIANS_TO_DEGREES, ship_rt );
+	sgMakeRotMat4( sgROT_hdg, 180.0, ship_up );
+	
+	sgMat4 sgTUX;
+	sgCopyMat4( sgTUX, sgROT_hdg );
+	sgPostMultMat4( sgTUX, sgROT_lat );
+	sgPostMultMat4( sgTUX, sgROT_lon );
+	sgPostMultMat4( sgTUX, sgTRANS );
+
+	sgCoord shippos;
+	sgSetCoord(&shippos, sgTUX );
+	ship_pos[m]->setTransform( &shippos );
+    }
+    if ( ship_sel != NULL ) {
+	ship_sel->select(0xFFFFFFFF);
+    }
+}
+
+// $$$ end - added VS Renganathan, 15 Oct 2K
+//           added Venky         , 12 Nov 2K