#include <simgear/timing/sg_time.hxx>
#include <simgear/math/sg_random.h>
-// Class refferences
+// 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 <Time/light.hxx>
-
-
-
#include <Include/general.hxx>
#include <Cockpit/cockpit.hxx>
#include <Cockpit/hud.hxx>
double throttle_hz = fgGetDouble("/sim/frame-rate-throttle-hz", 0.0);
if ( throttle_hz > 0.0 && scenery_loaded ) {
- static double remainder = 0.0;
-
- // simple frame rate throttle
- double dt = 1000000.0 / throttle_hz + remainder;
- int wait = dt / 1000;
- remainder = dt - ( wait * 1000.0 );
-
+ // optionally throttle the frame rate (to get consistant frame
+ // rates or reduce cpu usage.
+
+ double frame_us = 1000000.0 / throttle_hz;
+
+#define FG_SLEEP_BASED_TIMING 1
+#if defined(FG_SLEEP_BASED_TIMING)
+ // sleep based timing loop.
+ //
+ // Calling sleep, even usleep() on linux is less accurate than
+ // we like, but it does free up the cpu for other tasks during
+ // the sleep so it is desireable. Because of the way sleep()
+ // is implimented in consumer operating systems like windows
+ // and linux, you almost always sleep a little longer than the
+ // requested amount.
+ //
+ // To combat the problem of sleeping to long, we calculate the
+ // desired wait time and shorten it by 2000us (2ms) to avoid
+ // [hopefully] over-sleep'ing. The 2ms value was arrived at
+ // via experimentation. We follow this up at the end with a
+ // simple busy-wait loop to get the final pause timing exactly
+ // right.
+ //
+ // Assuming we don't oversleep by more than 2000us, this
+ // should be a reasonable compromise between sleep based
+ // waiting, and busy waiting.
+
+ // sleep() will always overshoot by a bit so undersleep by
+ // 2000us in the hopes of never oversleeping.
+ frame_us -= 2000.0;
+ if ( frame_us < 0.0 ) {
+ frame_us = 0.0;
+ }
current_time_stamp.stamp();
- int t_ms = (int) ( ( current_time_stamp - last_time_stamp ) / 1000 ) ; /* Convert to ms */
- if ( t_ms < wait ) {
- ulMilliSecondSleep ( wait - t_ms ) ;
+ /* Convert to ms */
+ double elapsed_us = current_time_stamp - last_time_stamp;
+ if ( elapsed_us < frame_us ) {
+ double requested_us = frame_us - elapsed_us;
+ ulMilliSecondSleep ( (int)(requested_us / 1000.0) ) ;
}
+#endif
+
+ // busy wait timing loop.
+ //
+ // This yields the most accurate timing. If the previous
+ // ulMilliSecondSleep() call is ommitted this will peg the cpu
+ // (which is just fine if FG is the only app you care about.)
current_time_stamp.stamp();
+ while ( current_time_stamp - last_time_stamp < frame_us ) {
+ current_time_stamp.stamp();
+ }
} else {
// run as fast as the app will go
current_time_stamp.stamp();
double visibility_meters = fgGetDouble("/environment/visibility-m");
FGViewer *current_view = globals->get_current_view();
+ // Let the scenery center follow the current view position with
+ // 30m increments.
+ //
+ // Having the scenery center near the view position will eliminate
+ // jitter of objects which are placed very near the view position
+ // and haveing it's center near that view position.
+ // So the 3d insruments of the aircraft will not jitter with this.
+ //
+ // Following the view position exactly would introduce jitter of
+ // the scenery tiles (they would be from their center up to 10000m
+ // to the view and this will introduce roundoff too). By stepping
+ // at 30m incements the roundoff error of the scenery tiles is
+ // still present, but we will make exactly the same roundoff error
+ // at each frame until the center is switched to a new
+ // position. This roundoff is still visible but you will most
+ // propably not notice.
+ double *vp = globals->get_current_view()->get_absolute_view_pos();
+ Point3D cntr(vp[0], vp[1], vp[2]);
+ if (30.0*30.0 < cntr.distance3Dsquared(globals->get_scenery()->get_center())) {
+ globals->get_scenery()->set_next_center( cntr );
+ }
+
// get the location data for the primary FDM (now hardcoded to ac model)...
SGLocation *acmodel_loc = NULL;
acmodel_loc = (SGLocation *)globals->
acmodel_loc->
get_absolute_view_pos(globals->
get_scenery()->get_center()) );
+ globals->get_scenery()->set_center( cntr );
+
// save results of update in SGLocation for fdm...
if ( globals->get_scenery()->get_cur_elev() > -9990 ) {
acmodel_loc->
SGLocation *view_location = globals->get_current_view()->getSGLocation();
globals->get_tile_mgr()->update( view_location, visibility_meters,
current_view->get_absolute_view_pos() );
+ globals->get_scenery()->set_center( cntr );
// save results of update in SGLocation for fdm...
if ( globals->get_scenery()->get_cur_elev() > -9990 ) {
current_view->getSGLocation()->
// then on.
static void fgIdleFunction ( void ) {
- // printf("idle state == %d\n", idle_state);
-
if ( idle_state == 0 ) {
- // Initialize the splash screen right away
- if ( fgGetBool("/sim/startup/splash-screen") ) {
- fgSplashInit(fgGetString("/sim/startup/splash-texture"));
- }
-
idle_state++;
+ fgSplashProgress("setting up scenegraph & user interface");
+
+
} else if ( idle_state == 1 ) {
+ idle_state++;
+ // This seems to be the absolute earliest in the init sequence
+ // that these calls will return valid info. Too bad it's after
+ // we've already created and sized out window. :-(
+ 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_glRenderer() );
+
+ GLint tmp;
+ glGetIntegerv( GL_MAX_TEXTURE_SIZE, &tmp );
+ general.set_glMaxTexSize( tmp );
+ SG_LOG ( SG_GENERAL, SG_INFO, "Max texture size = " << tmp );
+
+ glGetIntegerv( GL_DEPTH_BITS, &tmp );
+ general.set_glDepthBits( tmp );
+ SG_LOG ( SG_GENERAL, SG_INFO, "Depth buffer bits = " << tmp );
+
+ // Initialize ssg (from plib). Needs to come before we do any
+ // other ssg stuff, but after opengl has been initialized.
+ ssgInit();
+
+ // Initialize the user interface (we need to do this before
+ // passing off control to the OS main loop and before
+ // fgInitGeneral to get our fonts !!!
+ guiInit();
+ fgSplashProgress("reading aircraft list");
+
+
+ } else if ( idle_state == 2 ) {
+ idle_state++;
+ // Read the list of available aircrafts
+ fgReadAircraft();
+
+#ifdef GL_EXT_texture_lod_bias
+ glTexEnvf( GL_TEXTURE_FILTER_CONTROL_EXT, GL_TEXTURE_LOD_BIAS_EXT, -0.5 ) ;
+#endif
+
+ // get the address of our OpenGL extensions
+ if ( fgGetBool("/sim/rendering/distance-attenuation") ) {
+ if (SGIsOpenGLExtensionSupported("GL_EXT_point_parameters") ) {
+ glPointParameterIsSupported = true;
+ glPointParameterfPtr = (glPointParameterfProc)
+ SGLookupFunction("glPointParameterfEXT");
+ glPointParameterfvPtr = (glPointParameterfvProc)
+ SGLookupFunction("glPointParameterfvEXT");
+
+ } else if ( SGIsOpenGLExtensionSupported("GL_ARB_point_parameters") ) {
+ glPointParameterIsSupported = true;
+ glPointParameterfPtr = (glPointParameterfProc)
+ SGLookupFunction("glPointParameterfARB");
+ glPointParameterfvPtr = (glPointParameterfvProc)
+ SGLookupFunction("glPointParameterfvARB");
+ } else
+ glPointParameterIsSupported = false;
+ }
+ fgSplashProgress("reading navigation data");
+
+
+ } else if ( idle_state == 3 ) {
+ idle_state++;
+ fgInitNav();
+ fgSplashProgress("setting up scenery");
+
+
+ } else if ( idle_state == 4 ) {
+ idle_state++;
+ // based on the requested presets, calculate the true starting
+ // lon, lat
+ fgInitPosition();
+
+ SGTime *t = fgInitTime();
+ globals->set_time_params( t );
+
+ // Do some quick general initializations
+ if( !fgInitGeneral()) {
+ SG_LOG( SG_GENERAL, SG_ALERT,
+ "General initializations failed ..." );
+ exit(-1);
+ }
+
+ ////////////////////////////////////////////////////////////////////
+ // Initialize the property-based built-in commands
+ ////////////////////////////////////////////////////////////////////
+ fgInitCommands();
+
+
+ ////////////////////////////////////////////////////////////////////
+ // Initialize the material manager
+ ////////////////////////////////////////////////////////////////////
+ globals->set_matlib( new SGMaterialLib );
+ globals->set_model_lib(new SGModelLib);
+
+
+ ////////////////////////////////////////////////////////////////////
+ // Initialize the TG scenery subsystem.
+ ////////////////////////////////////////////////////////////////////
+ globals->set_scenery( new FGScenery );
+ globals->get_scenery()->init();
+ globals->get_scenery()->bind();
+ globals->set_tile_mgr( new FGTileMgr );
+
+
+ ////////////////////////////////////////////////////////////////////
+ // Initialize the general model subsystem.
+ ////////////////////////////////////////////////////////////////////
+ globals->set_model_mgr(new FGModelMgr);
+ globals->get_model_mgr()->init();
+ globals->get_model_mgr()->bind();
+ fgSplashProgress("loading aircraft");
+
+
+ } 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();
+
+ ////////////////////////////////////////////////////////////////////
+ // Initialize the view manager subsystem.
+ ////////////////////////////////////////////////////////////////////
+ FGViewMgr *viewmgr = new FGViewMgr;
+ globals->set_viewmgr( viewmgr );
+ viewmgr->init();
+ viewmgr->bind();
+ fgSplashProgress("generating sky elements");
+
+
+ } 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 );
+
+ // TODO: move to environment mgr
+ thesky = new SGSky;
+ SGPath texture_path(globals->get_fg_root());
+ texture_path.append("Textures");
+ texture_path.append("Sky");
+ for (int i = 0; i < FGEnvironmentMgr::MAX_CLOUD_LAYERS; i++) {
+ SGCloudLayer * layer = new SGCloudLayer(texture_path.str());
+ thesky->add_cloud_layer(layer);
+ }
+
+ SGPath sky_tex_path( globals->get_fg_root() );
+ sky_tex_path.append( "Textures" );
+ sky_tex_path.append( "Sky" );
+ thesky->texture_path( sky_tex_path.str() );
+
+ // The sun and moon diameters are scaled down numbers of the
+ // actual diameters. This was needed to fit bot the sun and the
+ // moon within the distance to the far clip plane.
+ // Moon diameter: 3,476 kilometers
+ // 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() );
+
+ // Initialize MagVar model
+ SGMagVar *magvar = new SGMagVar();
+ globals->set_mag( magvar );
+
+
+ // kludge to initialize mag compass
+ // (should only be done for in-flight
+ // startup)
+ // update magvar model
+ globals->get_mag()->update( fgGetDouble("/position/longitude-deg")
+ * SGD_DEGREES_TO_RADIANS,
+ fgGetDouble("/position/latitude-deg")
+ * SGD_DEGREES_TO_RADIANS,
+ fgGetDouble("/position/altitude-ft")
+ * SG_FEET_TO_METER,
+ globals->get_time_params()->getJD() );
+ double var = globals->get_mag()->get_magvar() * SGD_RADIANS_TO_DEGREES;
+ fgSetDouble("/instrumentation/heading-indicator/offset-deg", -var);
+
+ // airport = new ssgBranch;
+ // airport->setName( "Airport Lighting" );
+ // lighting->addKid( airport );
+
+ // build our custom render states
+ globals->get_renderer()->build_states();
+ fgSplashProgress("initializing subsystems");
+
+
+ } else if ( idle_state == 7 ) {
+ idle_state++;
// Initialize audio support
#ifdef ENABLE_AUDIO_SUPPORT
}
#endif
- idle_state++;
- } else if ( idle_state == 2 ) {
// These are a few miscellaneous things that aren't really
// "subsystems" but still need to be initialized.
}
#endif
- idle_state++;
- } 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 flightgear, its initialization call should
"Subsystem initializations failed ..." );
exit(-1);
}
+ fgSplashProgress("setup time & renderer");
- idle_state++;
- } else if ( idle_state == 4 ) {
+
+ } else if ( idle_state == 8 ) {
+ idle_state = 1000;
// Initialize the time offset (warp) after fgInitSubsystem
// (which initializes the lighting interpolation tables.)
fgInitTimeOffset();
// setup OpenGL view parameters
globals->get_renderer()->init();
- // Read the list of available aircrafts
- fgReadAircraft();
-
- idle_state++;
- } else if ( idle_state == 5 ) {
-
- idle_state++;
- } else if ( idle_state == 6 ) {
- // sleep(1);
-
- idle_state = 1000;
-
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");
+
+ }
if ( idle_state == 1000 ) {
// We've finished all our initialization steps, from now on we
// run the main loop.
- fgSetBool("sim/sceneryloaded",false);
-
- fgRegisterIdleHandler(fgMainLoop);
- } else {
- if ( fgGetBool("/sim/startup/splash-screen") ) {
- fgSplashUpdate(0.0, 1.0);
- }
+ fgSetBool("sim/sceneryloaded", false);
+ fgRegisterIdleHandler( fgMainLoop );
}
}
bool get_stencil_buffer = false;
#endif
+ // Initialize plib net interface
+ netInit( &argc, argv );
+
// Clouds3D requires an alpha channel
// clouds may require stencil buffer
fgOSOpenWindow( fgGetInt("/sim/startup/xsize"),
get_stencil_buffer,
fgGetBool("/sim/startup/fullscreen") );
- // This seems to be the absolute earliest in the init sequence
- // that these calls will return valid info. Too bad it's after
- // we've already created and sized out window. :-(
- 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_glRenderer() );
-
- GLint tmp;
- glGetIntegerv( GL_MAX_TEXTURE_SIZE, &tmp );
- general.set_glMaxTexSize( tmp );
- SG_LOG ( SG_GENERAL, SG_INFO, "Max texture size = " << tmp );
-
- glGetIntegerv( GL_DEPTH_BITS, &tmp );
- general.set_glDepthBits( tmp );
- SG_LOG ( SG_GENERAL, SG_INFO, "Depth buffer bits = " << tmp );
-
- // Initialize plib net interface
- netInit( &argc, argv );
-
- // Initialize ssg (from plib). Needs to come before we do any
- // other ssg stuff, but after opengl has been initialized.
- ssgInit();
-
- // Initialize the user interface (we need to do this before
- // passing off control to the OS main loop and before
- // fgInitGeneral to get our fonts !!!
- guiInit();
-
- // Read the list of available aircrafts
- fgReadAircraft();
-
-#ifdef GL_EXT_texture_lod_bias
- glTexEnvf( GL_TEXTURE_FILTER_CONTROL_EXT, GL_TEXTURE_LOD_BIAS_EXT, -0.5 ) ;
-#endif
-
- // get the address of our OpenGL extensions
- if ( fgGetBool("/sim/rendering/distance-attenuation") )
- {
- if (SGIsOpenGLExtensionSupported("GL_EXT_point_parameters") ) {
- glPointParameterIsSupported = true;
- glPointParameterfPtr = (glPointParameterfProc)
- SGLookupFunction("glPointParameterfEXT");
- glPointParameterfvPtr = (glPointParameterfvProc)
- SGLookupFunction("glPointParameterfvEXT");
-
- } else if ( SGIsOpenGLExtensionSupported("GL_ARB_point_parameters") ) {
- glPointParameterIsSupported = true;
- glPointParameterfPtr = (glPointParameterfProc)
- SGLookupFunction("glPointParameterfARB");
- glPointParameterfvPtr = (glPointParameterfvProc)
- SGLookupFunction("glPointParameterfvARB");
- } else
- glPointParameterIsSupported = false;
- }
-
- // based on the requested presets, calculate the true starting
- // lon, lat
- fgInitNav();
- fgInitPosition();
-
- SGTime *t = fgInitTime();
- globals->set_time_params( t );
-
- // Do some quick general initializations
- if( !fgInitGeneral()) {
- SG_LOG( SG_GENERAL, SG_ALERT,
- "General initializations failed ..." );
- exit(-1);
- }
-
- ////////////////////////////////////////////////////////////////////
- // Initialize the property-based built-in commands
- ////////////////////////////////////////////////////////////////////
- fgInitCommands();
-
- ////////////////////////////////////////////////////////////////////
- // Initialize the material manager
- ////////////////////////////////////////////////////////////////////
- globals->set_matlib( new SGMaterialLib );
-
- globals->set_model_lib(new SGModelLib);
-
- ////////////////////////////////////////////////////////////////////
- // Initialize the TG scenery subsystem.
- ////////////////////////////////////////////////////////////////////
- globals->set_scenery( new FGScenery );
- globals->get_scenery()->init();
- globals->get_scenery()->bind();
- globals->set_tile_mgr( new FGTileMgr );
-
- ////////////////////////////////////////////////////////////////////
- // Initialize the general model subsystem.
- ////////////////////////////////////////////////////////////////////
- globals->set_model_mgr(new FGModelMgr);
- globals->get_model_mgr()->init();
- globals->get_model_mgr()->bind();
-
- ////////////////////////////////////////////////////////////////////
- // 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();
-
- ////////////////////////////////////////////////////////////////////
- // Initialize the view manager subsystem.
- ////////////////////////////////////////////////////////////////////
- FGViewMgr *viewmgr = new FGViewMgr;
- globals->set_viewmgr( viewmgr );
- viewmgr->init();
- viewmgr->bind();
-
-
- // 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 );
-
- // TODO: move to environment mgr
- thesky = new SGSky;
- SGPath texture_path(globals->get_fg_root());
- texture_path.append("Textures");
- texture_path.append("Sky");
- for (int i = 0; i < FGEnvironmentMgr::MAX_CLOUD_LAYERS; i++) {
- SGCloudLayer * layer = new SGCloudLayer(texture_path.str());
- thesky->add_cloud_layer(layer);
- }
-
- SGPath sky_tex_path( globals->get_fg_root() );
- sky_tex_path.append( "Textures" );
- sky_tex_path.append( "Sky" );
- thesky->texture_path( sky_tex_path.str() );
-
- // The sun and moon diameters are scaled down numbers of the
- // actual diameters. This was needed to fit bot the sun and the
- // moon within the distance to the far clip plane.
- // Moon diameter: 3,476 kilometers
- // 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() );
-
- // Initialize MagVar model
- SGMagVar *magvar = new SGMagVar();
- globals->set_mag( magvar );
-
-
- // kludge to initialize mag compass
- // (should only be done for in-flight
- // startup)
- // update magvar model
- globals->get_mag()->update( fgGetDouble("/position/longitude-deg")
- * SGD_DEGREES_TO_RADIANS,
- fgGetDouble("/position/latitude-deg")
- * SGD_DEGREES_TO_RADIANS,
- fgGetDouble("/position/altitude-ft")
- * SG_FEET_TO_METER,
- globals->get_time_params()->getJD() );
- double var = globals->get_mag()->get_magvar() * SGD_RADIANS_TO_DEGREES;
- fgSetDouble("/instrumentation/heading-indicator/offset-deg", -var);
-
- // airport = new ssgBranch;
- // airport->setName( "Airport Lighting" );
- // lighting->addKid( airport );
-
- // build our custom render states
- globals->get_renderer()->build_states();
+ // Initialize the splash screen right away
+ fgSplashInit(fgGetString("/sim/startup/splash-texture"));
// pass control off to the master event handler
fgOSMainLoop();
}
-// end of main.cxx
projects / flightgear.git / blobdiff