src/Main/renderer.cxx

   1 // renderer.cxx -- top level sim routines
   2 //
   3 // Written by Curtis Olson, started May 1997.
   4 // This file contains parts of main.cxx prior to october 2004
   5 //
   6 // Copyright (C) 1997 - 2002  Curtis L. Olson  - http://www.flightgear.org/~curt
   7 //
   8 // This program is free software; you can redistribute it and/or
   9 // modify it under the terms of the GNU General Public License as
  10 // published by the Free Software Foundation; either version 2 of the
  11 // License, or (at your option) any later version.
  12 //
  13 // This program is distributed in the hope that it will be useful, but
  14 // WITHOUT ANY WARRANTY; without even the implied warranty of
  15 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  16 // General Public License for more details.
  17 //
  18 // You should have received a copy of the GNU General Public License
  19 // along with this program; if not, write to the Free Software
  20 // Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  21 //
  22 // $Id$
  23
  24
  25 #ifdef HAVE_CONFIG_H
  26 #  include <config.h>
  27 #endif
  28
  29 #include <simgear/compiler.h>
  30
  31 #ifdef HAVE_WINDOWS_H
  32 #  include <windows.h>
  33 #endif
  34
  35 #include <plib/ssg.h>
  36 #include <plib/netSocket.h>
  37
  38 #include <simgear/screen/extensions.hxx>
  39 #include <simgear/scene/material/matlib.hxx>
  40 #include <simgear/props/props.hxx>
  41 #include <simgear/timing/sg_time.hxx>
  42 #include <simgear/scene/model/animation.hxx>
  43 #include <simgear/ephemeris/ephemeris.hxx>
  44 #include <simgear/scene/model/placement.hxx>
  45 #include <simgear/math/sg_random.h>
  46 #include <simgear/scene/model/modellib.hxx>
  47 #include <simgear/scene/model/model.hxx>
  48 #ifdef FG_JPEG_SERVER
  49 #include <simgear/screen/jpgfactory.hxx>
  50 #endif
  51
  52 #ifdef FG_USE_CLOUDS_3D
  53 #  include <simgear/scene/sky/clouds3d/SkySceneLoader.hpp>
  54 #  include <simgear/scene/sky/clouds3d/SkyUtil.hpp>
  55 #endif
  56
  57 #include <Scenery/tileentry.hxx>
  58 #include <Time/light.hxx>
  59 #include <Time/light.hxx>
  60 #include <Aircraft/aircraft.hxx>
  61 #include <Cockpit/panel.hxx>
  62 #include <Cockpit/cockpit.hxx>
  63 #include <Cockpit/hud.hxx>
  64 #include <Model/panelnode.hxx>
  65 #include <Model/modelmgr.hxx>
  66 #include <Model/acmodel.hxx>
  67 #include <Scenery/scenery.hxx>
  68 #include <Scenery/tilemgr.hxx>
  69 #include <ATC/ATCdisplay.hxx>
  70 #include <Replay/replay.hxx>
  71 #include <GUI/new_gui.hxx>
  72
  73 #include "splash.hxx"
  74 #include "renderer.hxx"
  75 #include "main.hxx"
  76
  77
  78 float default_attenuation[3] = {1.0, 0.0, 0.0};
  79
  80 ssgSelector *lightpoints_brightness = new ssgSelector;
  81 ssgTransform *lightpoints_transform = new ssgTransform;
  82 FGTileEntry *dummy_tile;
  83 sgVec3 rway_ols;
  84
  85 // Clip plane settings...
  86 float scene_nearplane = 0.5f;
  87 float scene_farplane = 120000.0f;
  88
  89 glPointParameterfProc glPointParameterfPtr = 0;
  90 glPointParameterfvProc glPointParameterfvPtr = 0;
  91 bool glPointParameterIsSupported = false;
  92
  93
  94 // fog constants.  I'm a little nervous about putting actual code out
  95 // here but it seems to work (?)
  96 static const double m_log01 = -log( 0.01 );
  97 static const double sqrt_m_log01 = sqrt( m_log01 );
  98 static GLfloat fog_exp_density;
  99 static GLfloat fog_exp2_density;
 100 static GLfloat rwy_exp2_punch_through;
 101 static GLfloat taxi_exp2_punch_through;
 102 static GLfloat ground_exp2_punch_through;
 103
 104 // Sky structures
 105 SGSky *thesky;
 106
 107 #ifdef FG_USE_CLOUDS_3D
 108   SkySceneLoader *sgClouds3d;
 109   bool _bcloud_orig = true;
 110 #endif
 111
 112 // hack
 113 sgMat4 copy_of_ssgOpenGLAxisSwapMatrix =
 114 {
 115   {  1.0f,  0.0f,  0.0f,  0.0f },
 116   {  0.0f,  0.0f, -1.0f,  0.0f },
 117   {  0.0f,  1.0f,  0.0f,  0.0f },
 118   {  0.0f,  0.0f,  0.0f,  1.0f }
 119 };
 120
 121 ssgSimpleState *cloud3d_imposter_state;
 122 ssgSimpleState *default_state;
 123 ssgSimpleState *hud_and_panel;
 124 ssgSimpleState *menus;
 125
 126 FGRenderer::FGRenderer()
 127 {
 128 #ifdef FG_JPEG_SERVER
 129    jpgRenderFrame = FGRenderer::update;
 130 #endif
 131 }
 132
 133 FGRenderer::~FGRenderer()
 134 {
 135 #ifdef FG_JPEG_SERVER
 136    jpgRenderFrame = NULL;
 137 #endif
 138 }
 139
 140
 141 void
 142 FGRenderer::build_states( void ) {
 143     default_state = new ssgSimpleState;
 144     default_state->ref();
 145     default_state->disable( GL_TEXTURE_2D );
 146     default_state->enable( GL_CULL_FACE );
 147     default_state->enable( GL_COLOR_MATERIAL );
 148     default_state->setColourMaterial( GL_AMBIENT_AND_DIFFUSE );
 149     default_state->setMaterial( GL_EMISSION, 0, 0, 0, 1 );
 150     default_state->setMaterial( GL_SPECULAR, 0, 0, 0, 1 );
 151     default_state->disable( GL_BLEND );
 152     default_state->disable( GL_ALPHA_TEST );
 153     default_state->disable( GL_LIGHTING );
 154
 155     cloud3d_imposter_state = new ssgSimpleState;
 156     cloud3d_imposter_state->ref();
 157     cloud3d_imposter_state->enable( GL_TEXTURE_2D );
 158     cloud3d_imposter_state->enable( GL_CULL_FACE );
 159     cloud3d_imposter_state->enable( GL_COLOR_MATERIAL );
 160     cloud3d_imposter_state->setColourMaterial( GL_AMBIENT_AND_DIFFUSE );
 161     cloud3d_imposter_state->setMaterial( GL_DIFFUSE, 1, 1, 1, 1 );
 162     cloud3d_imposter_state->setMaterial( GL_AMBIENT, 1, 1, 1, 1 );
 163     cloud3d_imposter_state->setMaterial( GL_EMISSION, 0, 0, 0, 1 );
 164     cloud3d_imposter_state->setMaterial( GL_SPECULAR, 0, 0, 0, 1 );
 165     cloud3d_imposter_state->enable( GL_BLEND );
 166     cloud3d_imposter_state->enable( GL_ALPHA_TEST );
 167     cloud3d_imposter_state->disable( GL_LIGHTING );
 168
 169     hud_and_panel = new ssgSimpleState;
 170     hud_and_panel->ref();
 171     hud_and_panel->disable( GL_CULL_FACE );
 172     hud_and_panel->disable( GL_TEXTURE_2D );
 173     hud_and_panel->disable( GL_LIGHTING );
 174     hud_and_panel->enable( GL_BLEND );
 175
 176     menus = new ssgSimpleState;
 177     menus->ref();
 178     menus->disable( GL_CULL_FACE );
 179     menus->disable( GL_TEXTURE_2D );
 180     menus->enable( GL_BLEND );
 181 }
 182
 183
 184 // Initialize various GL/view parameters
 185 void
 186 FGRenderer::init( void ) {
 187
 188     FGLight *l = (FGLight *)(globals->get_subsystem("lighting"));
 189
 190     // Go full screen if requested ...
 191     if ( fgGetBool("/sim/startup/fullscreen") ) {
 192         fgOSFullScreen();
 193     }
 194
 195     // If enabled, normal vectors specified with glNormal are scaled
 196     // to unit length after transformation.  Enabling this has
 197     // performance implications.  See the docs for glNormal.
 198     // glEnable( GL_NORMALIZE );
 199
 200     glEnable( GL_LIGHTING );
 201     glEnable( GL_LIGHT0 );
 202     // glLightfv( GL_LIGHT0, GL_POSITION, l->sun_vec );  // done later with ssg
 203
 204     sgVec3 sunpos;
 205     sgSetVec3( sunpos, l->sun_vec()[0], l->sun_vec()[1], l->sun_vec()[2] );
 206     ssgGetLight( 0 ) -> setPosition( sunpos );
 207
 208     glFogi (GL_FOG_MODE, GL_EXP2);
 209     if ( (!strcmp(fgGetString("/sim/rendering/fog"), "disabled")) ||
 210          (!fgGetBool("/sim/rendering/shading"))) {
 211         // if fastest fog requested, or if flat shading force fastest
 212         glHint ( GL_FOG_HINT, GL_FASTEST );
 213     } else if ( !strcmp(fgGetString("/sim/rendering/fog"), "nicest") ) {
 214         glHint ( GL_FOG_HINT, GL_NICEST );
 215     }
 216     if ( fgGetBool("/sim/rendering/wireframe") ) {
 217         // draw wire frame
 218         glPolygonMode( GL_FRONT_AND_BACK, GL_LINE );
 219     }
 220
 221     // This is the default anyways, but it can't hurt
 222     glFrontFace ( GL_CCW );
 223
 224     // Just testing ...
 225     // glEnable(GL_POINT_SMOOTH);
 226     // glEnable(GL_LINE_SMOOTH);
 227     // glEnable(GL_POLYGON_SMOOTH);
 228 }
 229
 230
 231 // Update all Visuals (redraws anything graphics related)
 232 void
 233 FGRenderer::update( bool refresh_camera_settings ) {
 234     bool scenery_loaded = fgGetBool("sim/sceneryloaded") || fgGetBool("sim/sceneryloaded-override");
 235     bool draw_otw = fgGetBool("/sim/rendering/draw-otw");
 236     bool skyblend = fgGetBool("/sim/rendering/skyblend");
 237     bool enhanced_lighting = fgGetBool("/sim/rendering/enhanced-lighting");
 238     bool distance_attenuation = fgGetBool("/sim/rendering/distance-attenuation");
 239 #ifdef FG_ENABLE_MULTIPASS_CLOUDS
 240     bool multi_pass_clouds = fgGetBool("/sim/rendering/multi-pass-clouds") &&
 241                                 !SGCloudLayer::enable_bump_mapping;  // ugly artefact now
 242 #else
 243     bool multi_pass_clouds = false;
 244 #endif
 245     bool draw_clouds = fgGetBool("/environment/clouds/status");
 246
 247     GLfloat black[4] = { 0.0, 0.0, 0.0, 1.0 };
 248     GLfloat white[4] = { 1.0, 1.0, 1.0, 1.0 };
 249
 250     // static const SGPropertyNode *longitude
 251     //     = fgGetNode("/position/longitude-deg");
 252     // static const SGPropertyNode *latitude
 253     //     = fgGetNode("/position/latitude-deg");
 254     // static const SGPropertyNode *altitude
 255     //     = fgGetNode("/position/altitude-ft");
 256     static const SGPropertyNode *groundlevel_nearplane
 257         = fgGetNode("/sim/current-view/ground-level-nearplane-m");
 258
 259     FGLight *l = (FGLight *)(globals->get_subsystem("lighting"));
 260     static double last_visibility = -9999;
 261
 262     // update fog params
 263     double actual_visibility;
 264     if (fgGetBool("/environment/clouds/status")) {
 265         actual_visibility = thesky->get_visibility();
 266     } else {
 267         actual_visibility = fgGetDouble("/environment/visibility-m");
 268     }
 269
 270     if ( actual_visibility != last_visibility ) {
 271         last_visibility = actual_visibility;
 272
 273         fog_exp_density = m_log01 / actual_visibility;
 274         fog_exp2_density = sqrt_m_log01 / actual_visibility;
 275         ground_exp2_punch_through = sqrt_m_log01 / (actual_visibility * 1.5);
 276         if ( actual_visibility < 8000 ) {
 277             rwy_exp2_punch_through = sqrt_m_log01 / (actual_visibility * 2.5);
 278             taxi_exp2_punch_through = sqrt_m_log01 / (actual_visibility * 1.5);
 279         } else {
 280             rwy_exp2_punch_through = sqrt_m_log01 / ( 8000 * 2.5 );
 281             taxi_exp2_punch_through = sqrt_m_log01 / ( 8000 * 1.5 );
 282         }
 283     }
 284
 285     // double angle;
 286     // GLfloat black[4] = { 0.0, 0.0, 0.0, 1.0 };
 287     // GLfloat white[4] = { 1.0, 1.0, 1.0, 1.0 };
 288     // GLfloat terrain_color[4] = { 0.54, 0.44, 0.29, 1.0 };
 289     // GLfloat mat_shininess[] = { 10.0 };
 290     GLbitfield clear_mask;
 291
 292     if ( idle_state != 1000 || !scenery_loaded ) {
 293         // still initializing, draw the splash screen
 294         if ( fgGetBool("/sim/startup/splash-screen") ) {
 295             fgSplashUpdate(0.0, 1.0);
 296         }
 297         // Keep resetting sim time while the sim is initializing
 298         globals->set_sim_time_sec( 0.0 );
 299         SGAnimation::set_sim_time_sec( 0.0 );
 300     } else {
 301         // idle_state is now 1000 meaning we've finished all our
 302         // initializations and are running the main loop, so this will
 303         // now work without seg faulting the system.
 304
 305         FGViewer *current__view = globals->get_current_view();
 306
 307         // calculate our current position in cartesian space
 308         globals->get_scenery()->set_center( globals->get_scenery()->get_next_center() );
 309
 310         if ( refresh_camera_settings ) {
 311             // update view port
 312             resize( fgGetInt("/sim/startup/xsize"),
 313                     fgGetInt("/sim/startup/ysize") );
 314
 315             // Tell GL we are switching to model view parameters
 316             glMatrixMode(GL_MODELVIEW);
 317             glLoadIdentity();
 318             ssgSetCamera( (sgVec4 *)current__view->get_VIEW() );
 319         }
 320
 321         if ( fgGetBool("/sim/rendering/clouds3d") ) {
 322             glClear( GL_DEPTH_BUFFER_BIT | GL_COLOR_BUFFER_BIT );
 323             cloud3d_imposter_state->force();
 324             glDisable( GL_FOG );
 325             glColor4f( 1.0, 1.0, 1.0, 1.0 );
 326             glEnable(GL_DEPTH_TEST);
 327             glEnable(GL_BLEND);
 328             glBlendFunc( GL_ONE, GL_ONE_MINUS_SRC_ALPHA ) ;
 329
 330 #ifdef FG_USE_CLOUDS_3D
 331             if ( _bcloud_orig ) {
 332                 Point3D c = globals->get_scenery()->get_center();
 333                 sgClouds3d->Set_Cloud_Orig( &c );
 334                 _bcloud_orig = false;
 335             }
 336             sgClouds3d->Update( current__view->get_absolute_view_pos() );
 337 #endif
 338             glBlendFunc( GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA ) ;
 339             glDisable(GL_DEPTH_TEST);
 340         }
 341
 342         clear_mask = GL_DEPTH_BUFFER_BIT;
 343         if ( fgGetBool("/sim/rendering/wireframe") ) {
 344             clear_mask |= GL_COLOR_BUFFER_BIT;
 345         }
 346
 347         if ( skyblend ) {
 348             if ( fgGetBool("/sim/rendering/textures") ) {
 349             // glClearColor(black[0], black[1], black[2], black[3]);
 350             glClearColor(l->adj_fog_color()[0], l->adj_fog_color()[1],
 351                          l->adj_fog_color()[2], l->adj_fog_color()[3]);
 352             clear_mask |= GL_COLOR_BUFFER_BIT;
 353             }
 354         } else {
 355             glClearColor(l->sky_color()[0], l->sky_color()[1],
 356                          l->sky_color()[2], l->sky_color()[3]);
 357             clear_mask |= GL_COLOR_BUFFER_BIT;
 358         }
 359         if ( multi_pass_clouds && draw_clouds ) {
 360             glClearStencil( 0 );
 361             clear_mask |= GL_STENCIL_BUFFER_BIT;
 362         }
 363         glClear( clear_mask );
 364
 365         // set the opengl state to known default values
 366         default_state->force();
 367
 368         // update fog params if visibility has changed
 369         double visibility_meters = fgGetDouble("/environment/visibility-m");
 370         thesky->set_visibility(visibility_meters);
 371
 372         thesky->modify_vis( cur_fdm_state->get_Altitude() * SG_FEET_TO_METER,
 373                             ( global_multi_loop * fgGetInt("/sim/speed-up") )
 374                             / (double)fgGetInt("/sim/model-hz") );
 375
 376         // Set correct opengl fog density
 377         glFogf (GL_FOG_DENSITY, fog_exp2_density);
 378
 379         // update the sky dome
 380         if ( skyblend ) {
 381             /*
 382              SG_LOG( SG_GENERAL, SG_BULK, "thesky->repaint() sky_color = "
 383              << l->sky_color()[0] << " "
 384              << l->sky_color()[1] << " "
 385              << l->sky_color()[2] << " "
 386              << l->sky_color()[3] );
 387             SG_LOG( SG_GENERAL, SG_BULK, "    fog = "
 388              << l->fog_color()[0] << " "
 389              << l->fog_color()[1] << " "
 390              << l->fog_color()[2] << " "
 391              << l->fog_color()[3] );
 392             SG_LOG( SG_GENERAL, SG_BULK,
 393                     "    sun_angle = " << l->sun_angle
 394              << "    moon_angle = " << l->moon_angle );
 395             */
 396
 397             static SGSkyColor scolor;
 398             FGLight *l = (FGLight *)(globals->get_subsystem("lighting"));
 399
 400             scolor.sky_color   = l->sky_color();
 401             scolor.fog_color   = l->adj_fog_color();
 402             scolor.cloud_color = l->cloud_color();
 403             scolor.sun_angle   = l->get_sun_angle();
 404             scolor.moon_angle  = l->get_moon_angle();
 405             scolor.nplanets    = globals->get_ephem()->getNumPlanets();
 406             scolor.nstars      = globals->get_ephem()->getNumStars();
 407             scolor.planet_data = globals->get_ephem()->getPlanets();
 408             scolor.star_data   = globals->get_ephem()->getStars();
 409
 410             thesky->repaint( scolor );
 411
 412             /*
 413             SG_LOG( SG_GENERAL, SG_BULK,
 414                     "thesky->reposition( view_pos = " << view_pos[0] << " "
 415              << view_pos[1] << " " << view_pos[2] );
 416             SG_LOG( SG_GENERAL, SG_BULK,
 417                     "    zero_elev = " << zero_elev[0] << " "
 418              << zero_elev[1] << " " << zero_elev[2]
 419              << " lon = " << cur_fdm_state->get_Longitude()
 420              << " lat = " << cur_fdm_state->get_Latitude() );
 421             SG_LOG( SG_GENERAL, SG_BULK,
 422                     "    sun_rot = " << l->get_sun_rotation
 423              << " gst = " << SGTime::cur_time_params->getGst() );
 424             SG_LOG( SG_GENERAL, SG_BULK,
 425                  "    sun ra = " << globals->get_ephem()->getSunRightAscension()
 426               << " sun dec = " << globals->get_ephem()->getSunDeclination()
 427               << " moon ra = " << globals->get_ephem()->getMoonRightAscension()
 428               << " moon dec = " << globals->get_ephem()->getMoonDeclination() );
 429             */
 430
 431             // The sun and moon distances are scaled down versions
 432             // of the actual distance to get both the moon and the sun
 433             // within the range of the far clip plane.
 434             // Moon distance:    384,467 kilometers
 435             // Sun distance: 150,000,000 kilometers
 436             double sun_horiz_eff, moon_horiz_eff;
 437             if (fgGetBool("/sim/rendering/horizon-effect")) {
 438             sun_horiz_eff = 0.67+pow(0.5+cos(l->get_sun_angle())*2/2, 0.33)/3;
 439             moon_horiz_eff = 0.67+pow(0.5+cos(l->get_moon_angle())*2/2, 0.33)/3;
 440             } else {
 441                sun_horiz_eff = moon_horiz_eff = 1.0;
 442             }
 443
 444             static SGSkyState sstate;
 445
 446             sstate.view_pos  = current__view->get_view_pos();
 447             sstate.zero_elev = current__view->get_zero_elev();
 448             sstate.view_up   = current__view->get_world_up();
 449             sstate.lon       = current__view->getLongitude_deg()
 450                                 * SGD_DEGREES_TO_RADIANS;
 451             sstate.lat       = current__view->getLatitude_deg()
 452                                 * SGD_DEGREES_TO_RADIANS;
 453             sstate.alt       = current__view->getAltitudeASL_ft()
 454                                 * SG_FEET_TO_METER;
 455             sstate.spin      = l->get_sun_rotation();
 456             sstate.gst       = globals->get_time_params()->getGst();
 457             sstate.sun_ra    = globals->get_ephem()->getSunRightAscension();
 458             sstate.sun_dec   = globals->get_ephem()->getSunDeclination();
 459             sstate.sun_dist  = 50000.0 * sun_horiz_eff;
 460             sstate.moon_ra   = globals->get_ephem()->getMoonRightAscension();
 461             sstate.moon_dec  = globals->get_ephem()->getMoonDeclination();
 462             sstate.moon_dist = 40000.0 * moon_horiz_eff;
 463
 464             thesky->reposition( sstate, delta_time_sec );
 465         }
 466
 467         glEnable( GL_DEPTH_TEST );
 468         if ( strcmp(fgGetString("/sim/rendering/fog"), "disabled") ) {
 469             glEnable( GL_FOG );
 470             glFogi( GL_FOG_MODE, GL_EXP2 );
 471             glFogfv( GL_FOG_COLOR, l->adj_fog_color() );
 472         }
 473
 474         // set sun/lighting parameters
 475         ssgGetLight( 0 ) -> setPosition( l->sun_vec() );
 476
 477         // GL_LIGHT_MODEL_AMBIENT has a default non-zero value so if
 478         // we only update GL_AMBIENT for our lights we will never get
 479         // a completely dark scene.  So, we set GL_LIGHT_MODEL_AMBIENT
 480         // explicitely to black.
 481         glLightModelfv( GL_LIGHT_MODEL_AMBIENT, black );
 482
 483         ssgGetLight( 0 ) -> setColour( GL_AMBIENT, l->scene_ambient() );
 484         ssgGetLight( 0 ) -> setColour( GL_DIFFUSE, l->scene_diffuse() );
 485         ssgGetLight( 0 ) -> setColour( GL_SPECULAR, l->scene_specular() );
 486
 487         // texture parameters
 488         // glEnable( GL_TEXTURE_2D );
 489         glTexEnvi( GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE ) ;
 490         glHint( GL_PERSPECTIVE_CORRECTION_HINT, GL_NICEST ) ;
 491
 492         double agl =
 493             current_aircraft.fdm_state->get_Altitude() * SG_FEET_TO_METER
 494             - globals->get_scenery()->get_cur_elev();
 495
 496         if ( agl > 10.0 ) {
 497             scene_nearplane = 10.0f;
 498             scene_farplane = 120000.0f;
 499         } else {
 500             scene_nearplane = groundlevel_nearplane->getDoubleValue();
 501             scene_farplane = 120000.0f;
 502         }
 503
 504         ssgSetNearFar( scene_nearplane, scene_farplane );
 505
 506         if ( draw_otw && skyblend ) {
 507             // draw the sky backdrop
 508
 509             // we need a white diffuse light for the phase of the moon
 510             ssgGetLight( 0 ) -> setColour( GL_DIFFUSE, white );
 511             thesky->preDraw( cur_fdm_state->get_Altitude() * SG_FEET_TO_METER,
 512                              fog_exp2_density );
 513             // return to the desired diffuse color
 514             ssgGetLight( 0 ) -> setColour( GL_DIFFUSE, l->scene_diffuse() );
 515         }
 516
 517         // draw the ssg scene
 518         glEnable( GL_DEPTH_TEST );
 519
 520         ssgSetNearFar( scene_nearplane, scene_farplane );
 521
 522         if ( fgGetBool("/sim/rendering/wireframe") ) {
 523             // draw wire frame
 524             glPolygonMode( GL_FRONT_AND_BACK, GL_LINE );
 525         }
 526         if ( draw_otw ) {
 527             if ( draw_clouds ) {
 528
 529                 // Draw the terrain
 530                 FGTileMgr::set_tile_filter( true );
 531                 sgSetModelFilter( false );
 532                 globals->get_aircraft_model()->select( false );
 533                 ssgCullAndDraw( globals->get_scenery()->get_scene_graph() );
 534
 535                 // Disable depth buffer update, draw the clouds
 536                 glDepthMask( GL_FALSE );
 537                 thesky->drawUpperClouds();
 538                 if ( multi_pass_clouds ) {
 539                     thesky->drawLowerClouds();
 540                 }
 541                 glDepthMask( GL_TRUE );
 542
 543                 if ( multi_pass_clouds ) {
 544                     // Draw the objects except the aircraft
 545                     //  and update the stencil buffer with 1
 546                     glEnable( GL_STENCIL_TEST );
 547                     glStencilFunc( GL_ALWAYS, 1, 1 );
 548                     glStencilOp( GL_KEEP, GL_KEEP, GL_REPLACE );
 549                 }
 550                 FGTileMgr::set_tile_filter( false );
 551                 sgSetModelFilter( true );
 552                 ssgCullAndDraw( globals->get_scenery()->get_scene_graph() );
 553             } else {
 554                 FGTileMgr::set_tile_filter( true );
 555                 sgSetModelFilter( true );
 556                 globals->get_aircraft_model()->select( false );
 557                 ssgCullAndDraw( globals->get_scenery()->get_scene_graph() );
 558             }
 559         }
 560
 561         // This is a bit kludgy.  Every 200 frames, do an extra
 562         // traversal of the scene graph without drawing anything, but
 563         // with the field-of-view set to 360x360 degrees.  This
 564         // ensures that out-of-range random objects that are not in
 565         // the current view frustum will still be freed properly.
 566         static int counter = 0;
 567         counter++;
 568         if (counter == 200) {
 569             sgFrustum f;
 570             f.setFOV(360, 360);
 571                     // No need to put the near plane too close;
 572                     // this way, at least the aircraft can be
 573                     // culled.
 574             f.setNearFar(1000, 1000000);
 575             sgMat4 m;
 576             ssgGetModelviewMatrix(m);
 577             FGTileMgr::set_tile_filter( true );
 578             sgSetModelFilter( true );
 579             globals->get_scenery()->get_scene_graph()->cull(&f, m, true);
 580             counter = 0;
 581         }
 582
 583         // change state for lighting here
 584
 585         // draw runway lighting
 586         glFogf (GL_FOG_DENSITY, rwy_exp2_punch_through);
 587         ssgSetNearFar( scene_nearplane, scene_farplane );
 588
 589         if ( enhanced_lighting ) {
 590
 591             // Enable states for drawing points with GL_extension
 592             glEnable(GL_POINT_SMOOTH);
 593
 594             if ( distance_attenuation && glPointParameterIsSupported )
 595             {
 596                 // Enable states for drawing points with GL_extension
 597                 glEnable(GL_POINT_SMOOTH);
 598
 599                 float quadratic[3] = {1.0, 0.001, 0.0000001};
 600                 // makes the points fade as they move away
 601                 glPointParameterfvPtr(GL_DISTANCE_ATTENUATION_EXT, quadratic);
 602                 glPointParameterfPtr(GL_POINT_SIZE_MIN_EXT, 1.0);
 603             }
 604
 605             glPointSize(4.0);
 606
 607             // blending function for runway lights
 608             glBlendFunc ( GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA) ;
 609         }
 610
 611         glTexGeni(GL_S, GL_TEXTURE_GEN_MODE, GL_SPHERE_MAP);
 612         glTexGeni(GL_T, GL_TEXTURE_GEN_MODE, GL_SPHERE_MAP);
 613         glEnable(GL_TEXTURE_GEN_S);
 614         glEnable(GL_TEXTURE_GEN_T);
 615         glPolygonMode(GL_FRONT, GL_POINT);
 616
 617         // draw runway lighting
 618         if ( draw_otw ) {
 619             ssgCullAndDraw( globals->get_scenery()->get_vasi_lights_root() );
 620             ssgCullAndDraw( globals->get_scenery()->get_rwy_lights_root() );
 621         }
 622
 623         // change punch through and then draw taxi lighting
 624         glFogf ( GL_FOG_DENSITY, fog_exp2_density );
 625         // sgVec3 taxi_fog;
 626         // sgSetVec3( taxi_fog, 0.0, 0.0, 0.0 );
 627         // glFogfv ( GL_FOG_COLOR, taxi_fog );
 628         if ( draw_otw ) {
 629             ssgCullAndDraw( globals->get_scenery()->get_taxi_lights_root() );
 630         }
 631
 632         // clean up lighting
 633         glPolygonMode(GL_FRONT, GL_FILL);
 634         glDisable(GL_TEXTURE_GEN_S);
 635         glDisable(GL_TEXTURE_GEN_T);
 636
 637         //static int _frame_count = 0;
 638         //if (_frame_count % 30 == 0) {
 639         //  printf("SSG: %s\n", ssgShowStats());
 640         //}
 641         //else {
 642         //  ssgShowStats();
 643         //}
 644         //_frame_count++;
 645
 646
 647         if ( enhanced_lighting ) {
 648             if ( distance_attenuation && glPointParameterIsSupported ) {
 649                 glPointParameterfvPtr(GL_DISTANCE_ATTENUATION_EXT,
 650                                       default_attenuation);
 651             }
 652
 653             glPointSize(1.0);
 654             glDisable(GL_POINT_SMOOTH);
 655         }
 656
 657         // draw ground lighting
 658         glFogf (GL_FOG_DENSITY, ground_exp2_punch_through);
 659         if ( draw_otw ) {
 660             ssgCullAndDraw( globals->get_scenery()->get_gnd_lights_root() );
 661         }
 662
 663         if ( draw_otw && fgGetBool("/sim/rendering/clouds3d") ) {
 664             glDisable( GL_FOG );
 665             glDisable( GL_LIGHTING );
 666             // cout << "drawing new clouds" << endl;
 667
 668             glEnable(GL_DEPTH_TEST);
 669             glEnable(GL_BLEND);
 670             glBlendFunc( GL_ONE, GL_ONE_MINUS_SRC_ALPHA ) ;
 671
 672             /*
 673             glEnable( GL_TEXTURE_2D );
 674             glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
 675             glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
 676             glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
 677             glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
 678             */
 679
 680 #ifdef FG_USE_CLOUDS_3D
 681             sgClouds3d->Draw((sgVec4 *)current__view->get_VIEW());
 682 #endif
 683             glEnable( GL_FOG );
 684             glEnable( GL_LIGHTING );
 685             glEnable( GL_DEPTH_TEST );
 686             glBlendFunc ( GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA ) ;
 687         }
 688
 689         if ( draw_otw && draw_clouds ) {
 690             if ( multi_pass_clouds ) {
 691                 // Disable depth buffer update, draw the clouds where the
 692                 //  objects overwrite the already drawn clouds, by testing
 693                 //  the stencil buffer against 1
 694                 glDepthMask( GL_FALSE );
 695                 glStencilFunc( GL_EQUAL, 1, 1 );
 696                 glStencilOp( GL_KEEP, GL_KEEP, GL_KEEP );
 697                 thesky->drawUpperClouds();
 698                 thesky->drawLowerClouds();
 699                 glDepthMask( GL_TRUE );
 700                 glDisable( GL_STENCIL_TEST );
 701             } else {
 702                 glDepthMask( GL_FALSE );
 703                 thesky->drawLowerClouds();
 704                 glDepthMask( GL_TRUE );
 705             }
 706         }
 707
 708         if ( draw_otw ) {
 709             FGTileMgr::set_tile_filter( false );
 710             sgSetModelFilter( false );
 711             globals->get_aircraft_model()->select( true );
 712             globals->get_model_mgr()->draw();
 713             globals->get_aircraft_model()->draw();
 714             // If the view is internal, the previous line draw the
 715             //  cockpit with modified near/far clip planes and deselect
 716             //  the aircraft in the global scenegraph
 717             // Otherwise, it just enables the aircraft: The scenegraph
 718             //  must be drawn again to see the plane.
 719             ssgCullAndDraw( globals->get_scenery()->get_scene_graph() );
 720             FGTileMgr::set_tile_filter( true );
 721             sgSetModelFilter( true );
 722             globals->get_aircraft_model()->select( true );
 723         }
 724
 725         // display HUD && Panel
 726         glDisable( GL_FOG );
 727         glDisable( GL_DEPTH_TEST );
 728         // glDisable( GL_CULL_FACE );
 729         // glDisable( GL_TEXTURE_2D );
 730
 731         // update the controls subsystem
 732         globals->get_controls()->update(delta_time_sec);
 733
 734         hud_and_panel->apply();
 735         fgCockpitUpdate();
 736
 737         // Use the hud_and_panel ssgSimpleState for rendering the ATC output
 738         // This only works properly if called before the panel call
 739         if((fgGetBool("/sim/ATC/enabled")) || (fgGetBool("/sim/ai-traffic/enabled")))
 740             globals->get_ATC_display()->update(delta_time_sec);
 741
 742         // update the panel subsystem
 743         if ( globals->get_current_panel() != NULL ) {
 744             globals->get_current_panel()->update(delta_time_sec);
 745         }
 746         fgUpdate3DPanels();
 747
 748         // We can do translucent menus, so why not. :-)
 749         menus->apply();
 750         glBlendFunc ( GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA ) ;
 751         puDisplay();
 752         // glDisable ( GL_BLEND ) ;
 753
 754         glEnable( GL_DEPTH_TEST );
 755         glEnable( GL_FOG );
 756
 757         // Fade out the splash screen over the first three seconds.
 758         double t = globals->get_sim_time_sec();
 759         if ( t <= 1.0 ) {
 760             fgSplashUpdate(0.0, 1.0);
 761         } else if ( t <= 3.0) {
 762             fgSplashUpdate(0.0, (3.0 - t) / 2.0);
 763         }
 764     }
 765 }
 766
 767
 768
 769 // options.cxx needs to see this for toggle_panel()
 770 // Handle new window size or exposure
 771 void
 772 FGRenderer::resize( int width, int height ) {
 773     int view_h;
 774
 775     if ( (!fgGetBool("/sim/virtual-cockpit"))
 776          && fgPanelVisible() && idle_state == 1000 ) {
 777         view_h = (int)(height * (globals->get_current_panel()->getViewHeight() -
 778                              globals->get_current_panel()->getYOffset()) / 768.0);
 779     } else {
 780         view_h = height;
 781     }
 782
 783     glViewport( 0, (GLint)(height - view_h), (GLint)(width), (GLint)(view_h) );
 784
 785     fgSetInt("/sim/startup/xsize", width);
 786     fgSetInt("/sim/startup/ysize", height);
 787     guiInitMouse(width, height);
 788
 789     // for all views
 790     FGViewMgr *viewmgr = globals->get_viewmgr();
 791     if (viewmgr) {
 792       for ( int i = 0; i < viewmgr->size(); ++i ) {
 793         viewmgr->get_view(i)->
 794           set_aspect_ratio((float)view_h / (float)width);
 795       }
 796
 797       ssgSetFOV( viewmgr->get_current_view()->get_h_fov(),
 798                  viewmgr->get_current_view()->get_v_fov() );
 799
 800 #ifdef FG_USE_CLOUDS_3D
 801       sgClouds3d->Resize( viewmgr->get_current_view()->get_h_fov(),
 802                           viewmgr->get_current_view()->get_v_fov() );
 803 #endif
 804     }
 805
 806     fgHUDReshape();
 807
 808 }
 809
 810
 811 // end of renderer.cxx