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
 232 // Update all Visuals (redraws anything graphics related)
 233 void
 234 FGRenderer::update( bool refresh_camera_settings ) {
 235     bool scenery_loaded = fgGetBool("sim/sceneryloaded") || fgGetBool("sim/sceneryloaded-override");
 236     bool draw_otw = fgGetBool("/sim/rendering/draw-otw");
 237     bool skyblend = fgGetBool("/sim/rendering/skyblend");
 238     bool enhanced_lighting = fgGetBool("/sim/rendering/enhanced-lighting");
 239     bool distance_attenuation = fgGetBool("/sim/rendering/distance-attenuation");
 240 #ifdef FG_ENABLE_MULTIPASS_CLOUDS
 241     bool multi_pass_clouds = fgGetBool("/sim/rendering/multi-pass-clouds") &&
 242                                 !SGCloudLayer::enable_bump_mapping;  // ugly artefact now
 243 #else
 244     bool multi_pass_clouds = false;
 245 #endif
 246     bool draw_clouds = fgGetBool("/environment/clouds/status");
 247
 248     GLfloat black[4] = { 0.0, 0.0, 0.0, 1.0 };
 249     GLfloat white[4] = { 1.0, 1.0, 1.0, 1.0 };
 250
 251     // static const SGPropertyNode *longitude
 252     //     = fgGetNode("/position/longitude-deg");
 253     // static const SGPropertyNode *latitude
 254     //     = fgGetNode("/position/latitude-deg");
 255     // static const SGPropertyNode *altitude
 256     //     = fgGetNode("/position/altitude-ft");
 257     static const SGPropertyNode *groundlevel_nearplane
 258         = fgGetNode("/sim/current-view/ground-level-nearplane-m");
 259
 260     FGLight *l = (FGLight *)(globals->get_subsystem("lighting"));
 261     static double last_visibility = -9999;
 262
 263     // update fog params
 264     double actual_visibility;
 265     if (fgGetBool("/environment/clouds/status")) {
 266         actual_visibility = thesky->get_visibility();
 267     } else {
 268         actual_visibility = fgGetDouble("/environment/visibility-m");
 269     }
 270
 271     if ( actual_visibility != last_visibility ) {
 272         last_visibility = actual_visibility;
 273
 274         fog_exp_density = m_log01 / actual_visibility;
 275         fog_exp2_density = sqrt_m_log01 / actual_visibility;
 276         ground_exp2_punch_through = sqrt_m_log01 / (actual_visibility * 1.5);
 277         if ( actual_visibility < 8000 ) {
 278             rwy_exp2_punch_through = sqrt_m_log01 / (actual_visibility * 2.5);
 279             taxi_exp2_punch_through = sqrt_m_log01 / (actual_visibility * 1.5);
 280         } else {
 281             rwy_exp2_punch_through = sqrt_m_log01 / ( 8000 * 2.5 );
 282             taxi_exp2_punch_through = sqrt_m_log01 / ( 8000 * 1.5 );
 283         }
 284     }
 285
 286     // double angle;
 287     // GLfloat black[4] = { 0.0, 0.0, 0.0, 1.0 };
 288     // GLfloat white[4] = { 1.0, 1.0, 1.0, 1.0 };
 289     // GLfloat terrain_color[4] = { 0.54, 0.44, 0.29, 1.0 };
 290     // GLfloat mat_shininess[] = { 10.0 };
 291     GLbitfield clear_mask;
 292
 293     if ( idle_state != 1000 || !scenery_loaded ) {
 294         // still initializing, draw the splash screen
 295         if ( fgGetBool("/sim/startup/splash-screen") ) {
 296             fgSplashUpdate(0.0, 1.0);
 297         }
 298         // Keep resetting sim time while the sim is initializing
 299         globals->set_sim_time_sec( 0.0 );
 300         SGAnimation::set_sim_time_sec( 0.0 );
 301     } else {
 302         // idle_state is now 1000 meaning we've finished all our
 303         // initializations and are running the main loop, so this will
 304         // now work without seg faulting the system.
 305
 306         FGViewer *current__view = globals->get_current_view();
 307
 308         // calculate our current position in cartesian space
 309         globals->get_scenery()->set_center( globals->get_scenery()->get_next_center() );
 310
 311         if ( refresh_camera_settings ) {
 312             // update view port
 313             resize( fgGetInt("/sim/startup/xsize"),
 314                     fgGetInt("/sim/startup/ysize") );
 315
 316             // Tell GL we are switching to model view parameters
 317             glMatrixMode(GL_MODELVIEW);
 318             glLoadIdentity();
 319             ssgSetCamera( (sgVec4 *)current__view->get_VIEW() );
 320         }
 321
 322         if ( fgGetBool("/sim/rendering/clouds3d") ) {
 323             glClear( GL_DEPTH_BUFFER_BIT | GL_COLOR_BUFFER_BIT );
 324             cloud3d_imposter_state->force();
 325             glDisable( GL_FOG );
 326             glColor4f( 1.0, 1.0, 1.0, 1.0 );
 327             glEnable(GL_DEPTH_TEST);
 328             glEnable(GL_BLEND);
 329             glBlendFunc( GL_ONE, GL_ONE_MINUS_SRC_ALPHA ) ;
 330
 331 #ifdef FG_USE_CLOUDS_3D
 332             if ( _bcloud_orig ) {
 333                 Point3D c = globals->get_scenery()->get_center();
 334                 sgClouds3d->Set_Cloud_Orig( &c );
 335                 _bcloud_orig = false;
 336             }
 337             sgClouds3d->Update( current__view->get_absolute_view_pos() );
 338 #endif
 339             glBlendFunc( GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA ) ;
 340             glDisable(GL_DEPTH_TEST);
 341         }
 342
 343         clear_mask = GL_DEPTH_BUFFER_BIT;
 344         if ( fgGetBool("/sim/rendering/wireframe") ) {
 345             clear_mask |= GL_COLOR_BUFFER_BIT;
 346         }
 347
 348         if ( skyblend ) {
 349             if ( fgGetBool("/sim/rendering/textures") ) {
 350             // glClearColor(black[0], black[1], black[2], black[3]);
 351             glClearColor(l->adj_fog_color()[0], l->adj_fog_color()[1],
 352                          l->adj_fog_color()[2], l->adj_fog_color()[3]);
 353             clear_mask |= GL_COLOR_BUFFER_BIT;
 354             }
 355         } else {
 356             glClearColor(l->sky_color()[0], l->sky_color()[1],
 357                          l->sky_color()[2], l->sky_color()[3]);
 358             clear_mask |= GL_COLOR_BUFFER_BIT;
 359         }
 360         if ( multi_pass_clouds && draw_clouds ) {
 361             glClearStencil( 0 );
 362             clear_mask |= GL_STENCIL_BUFFER_BIT;
 363         }
 364         glClear( clear_mask );
 365
 366         // set the opengl state to known default values
 367         default_state->force();
 368
 369         // update fog params if visibility has changed
 370         double visibility_meters = fgGetDouble("/environment/visibility-m");
 371         thesky->set_visibility(visibility_meters);
 372
 373         thesky->modify_vis( cur_fdm_state->get_Altitude() * SG_FEET_TO_METER,
 374                             ( global_multi_loop * fgGetInt("/sim/speed-up") )
 375                             / (double)fgGetInt("/sim/model-hz") );
 376
 377         // Set correct opengl fog density
 378         glFogf (GL_FOG_DENSITY, fog_exp2_density);
 379
 380         // update the sky dome
 381         if ( skyblend ) {
 382             /*
 383              SG_LOG( SG_GENERAL, SG_BULK, "thesky->repaint() sky_color = "
 384              << l->sky_color()[0] << " "
 385              << l->sky_color()[1] << " "
 386              << l->sky_color()[2] << " "
 387              << l->sky_color()[3] );
 388             SG_LOG( SG_GENERAL, SG_BULK, "    fog = "
 389              << l->fog_color()[0] << " "
 390              << l->fog_color()[1] << " "
 391              << l->fog_color()[2] << " "
 392              << l->fog_color()[3] );
 393             SG_LOG( SG_GENERAL, SG_BULK,
 394                     "    sun_angle = " << l->sun_angle
 395              << "    moon_angle = " << l->moon_angle );
 396             */
 397
 398             static SGSkyColor scolor;
 399             FGLight *l = (FGLight *)(globals->get_subsystem("lighting"));
 400
 401             scolor.sky_color   = l->sky_color();
 402             scolor.fog_color   = l->adj_fog_color();
 403             scolor.cloud_color = l->cloud_color();
 404             scolor.sun_angle   = l->get_sun_angle();
 405             scolor.moon_angle  = l->get_moon_angle();
 406             scolor.nplanets    = globals->get_ephem()->getNumPlanets();
 407             scolor.nstars      = globals->get_ephem()->getNumStars();
 408             scolor.planet_data = globals->get_ephem()->getPlanets();
 409             scolor.star_data   = globals->get_ephem()->getStars();
 410
 411             thesky->repaint( scolor );
 412
 413             /*
 414             SG_LOG( SG_GENERAL, SG_BULK,
 415                     "thesky->reposition( view_pos = " << view_pos[0] << " "
 416              << view_pos[1] << " " << view_pos[2] );
 417             SG_LOG( SG_GENERAL, SG_BULK,
 418                     "    zero_elev = " << zero_elev[0] << " "
 419              << zero_elev[1] << " " << zero_elev[2]
 420              << " lon = " << cur_fdm_state->get_Longitude()
 421              << " lat = " << cur_fdm_state->get_Latitude() );
 422             SG_LOG( SG_GENERAL, SG_BULK,
 423                     "    sun_rot = " << l->get_sun_rotation
 424              << " gst = " << SGTime::cur_time_params->getGst() );
 425             SG_LOG( SG_GENERAL, SG_BULK,
 426                  "    sun ra = " << globals->get_ephem()->getSunRightAscension()
 427               << " sun dec = " << globals->get_ephem()->getSunDeclination()
 428               << " moon ra = " << globals->get_ephem()->getMoonRightAscension()
 429               << " moon dec = " << globals->get_ephem()->getMoonDeclination() );
 430             */
 431
 432             // The sun and moon distances are scaled down versions
 433             // of the actual distance to get both the moon and the sun
 434             // within the range of the far clip plane.
 435             // Moon distance:    384,467 kilometers
 436             // Sun distance: 150,000,000 kilometers
 437             double sun_horiz_eff, moon_horiz_eff;
 438             if (fgGetBool("/sim/rendering/horizon-effect")) {
 439             sun_horiz_eff = 0.67+pow(0.5+cos(l->get_sun_angle())*2/2, 0.33)/3;
 440             moon_horiz_eff = 0.67+pow(0.5+cos(l->get_moon_angle())*2/2, 0.33)/3;
 441             } else {
 442                sun_horiz_eff = moon_horiz_eff = 1.0;
 443             }
 444
 445             static SGSkyState sstate;
 446
 447             sstate.view_pos  = current__view->get_view_pos();
 448             sstate.zero_elev = current__view->get_zero_elev();
 449             sstate.view_up   = current__view->get_world_up();
 450             sstate.lon       = current__view->getLongitude_deg()
 451                                 * SGD_DEGREES_TO_RADIANS;
 452             sstate.lat       = current__view->getLatitude_deg()
 453                                 * SGD_DEGREES_TO_RADIANS;
 454             sstate.alt       = current__view->getAltitudeASL_ft()
 455                                 * SG_FEET_TO_METER;
 456             sstate.spin      = l->get_sun_rotation();
 457             sstate.gst       = globals->get_time_params()->getGst();
 458             sstate.sun_ra    = globals->get_ephem()->getSunRightAscension();
 459             sstate.sun_dec   = globals->get_ephem()->getSunDeclination();
 460             sstate.sun_dist  = 50000.0 * sun_horiz_eff;
 461             sstate.moon_ra   = globals->get_ephem()->getMoonRightAscension();
 462             sstate.moon_dec  = globals->get_ephem()->getMoonDeclination();
 463             sstate.moon_dist = 40000.0 * moon_horiz_eff;
 464
 465             thesky->reposition( sstate, delta_time_sec );
 466         }
 467
 468         glEnable( GL_DEPTH_TEST );
 469         if ( strcmp(fgGetString("/sim/rendering/fog"), "disabled") ) {
 470             glEnable( GL_FOG );
 471             glFogi( GL_FOG_MODE, GL_EXP2 );
 472             glFogfv( GL_FOG_COLOR, l->adj_fog_color() );
 473         }
 474
 475         // set sun/lighting parameters
 476         ssgGetLight( 0 ) -> setPosition( l->sun_vec() );
 477
 478         // GL_LIGHT_MODEL_AMBIENT has a default non-zero value so if
 479         // we only update GL_AMBIENT for our lights we will never get
 480         // a completely dark scene.  So, we set GL_LIGHT_MODEL_AMBIENT
 481         // explicitely to black.
 482         glLightModelfv( GL_LIGHT_MODEL_AMBIENT, black );
 483
 484         ssgGetLight( 0 ) -> setColour( GL_AMBIENT, l->scene_ambient() );
 485         ssgGetLight( 0 ) -> setColour( GL_DIFFUSE, l->scene_diffuse() );
 486         ssgGetLight( 0 ) -> setColour( GL_SPECULAR, l->scene_specular() );
 487
 488         // texture parameters
 489         // glEnable( GL_TEXTURE_2D );
 490         glTexEnvi( GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE ) ;
 491         glHint( GL_PERSPECTIVE_CORRECTION_HINT, GL_NICEST ) ;
 492
 493         double agl =
 494             current_aircraft.fdm_state->get_Altitude() * SG_FEET_TO_METER
 495             - globals->get_scenery()->get_cur_elev();
 496
 497         if ( agl > 10.0 ) {
 498             scene_nearplane = 10.0f;
 499             scene_farplane = 120000.0f;
 500         } else {
 501             scene_nearplane = groundlevel_nearplane->getDoubleValue();
 502             scene_farplane = 120000.0f;
 503         }
 504
 505         setNearFar( scene_nearplane, scene_farplane );
 506
 507         if ( draw_otw && skyblend ) {
 508             // draw the sky backdrop
 509
 510             // we need a white diffuse light for the phase of the moon
 511             ssgGetLight( 0 ) -> setColour( GL_DIFFUSE, white );
 512             thesky->preDraw( cur_fdm_state->get_Altitude() * SG_FEET_TO_METER,
 513                              fog_exp2_density );
 514             // return to the desired diffuse color
 515             ssgGetLight( 0 ) -> setColour( GL_DIFFUSE, l->scene_diffuse() );
 516         }
 517
 518         // draw the ssg scene
 519         glEnable( GL_DEPTH_TEST );
 520
 521         if ( fgGetBool("/sim/rendering/wireframe") ) {
 522             // draw wire frame
 523             glPolygonMode( GL_FRONT_AND_BACK, GL_LINE );
 524         }
 525         if ( draw_otw ) {
 526             if ( draw_clouds ) {
 527
 528                 // Draw the terrain
 529                 FGTileMgr::set_tile_filter( true );
 530                 sgSetModelFilter( false );
 531                 globals->get_aircraft_model()->select( false );
 532                 ssgCullAndDraw( globals->get_scenery()->get_scene_graph() );
 533
 534                 // Disable depth buffer update, draw the clouds
 535                 glDepthMask( GL_FALSE );
 536                 thesky->drawUpperClouds();
 537                 if ( multi_pass_clouds ) {
 538                     thesky->drawLowerClouds();
 539                 }
 540                 glDepthMask( GL_TRUE );
 541
 542                 if ( multi_pass_clouds ) {
 543                     // Draw the objects except the aircraft
 544                     //  and update the stencil buffer with 1
 545                     glEnable( GL_STENCIL_TEST );
 546                     glStencilFunc( GL_ALWAYS, 1, 1 );
 547                     glStencilOp( GL_KEEP, GL_KEEP, GL_REPLACE );
 548                 }
 549                 FGTileMgr::set_tile_filter( false );
 550                 sgSetModelFilter( true );
 551                 ssgCullAndDraw( globals->get_scenery()->get_scene_graph() );
 552             } else {
 553                 FGTileMgr::set_tile_filter( true );
 554                 sgSetModelFilter( true );
 555                 globals->get_aircraft_model()->select( false );
 556                 ssgCullAndDraw( globals->get_scenery()->get_scene_graph() );
 557             }
 558         }
 559
 560         // This is a bit kludgy.  Every 200 frames, do an extra
 561         // traversal of the scene graph without drawing anything, but
 562         // with the field-of-view set to 360x360 degrees.  This
 563         // ensures that out-of-range random objects that are not in
 564         // the current view frustum will still be freed properly.
 565         static int counter = 0;
 566         counter++;
 567         if (counter >= 200) {
 568             sgFrustum f;
 569             f.setFOV(360, 360);
 570                     // No need to put the near plane too close;
 571                     // this way, at least the aircraft can be
 572                     // culled.
 573             f.setNearFar(1000, 1000000);
 574             sgMat4 m;
 575             ssgGetModelviewMatrix(m);
 576             FGTileMgr::set_tile_filter( true );
 577             sgSetModelFilter( true );
 578             globals->get_scenery()->get_scene_graph()->cull(&f, m, true);
 579             counter = 0;
 580         }
 581
 582         // change state for lighting here
 583
 584         // draw runway lighting
 585         glFogf (GL_FOG_DENSITY, rwy_exp2_punch_through);
 586
 587         // CLO - 02/25/2005 - DO WE NEED THIS extra fgSetNearFar()?
 588         // fgSetNearFar( scene_nearplane, scene_farplane );
 589
 590         if ( enhanced_lighting ) {
 591
 592             // Enable states for drawing points with GL_extension
 593             glEnable(GL_POINT_SMOOTH);
 594
 595             if ( distance_attenuation && glPointParameterIsSupported )
 596             {
 597                 // Enable states for drawing points with GL_extension
 598                 glEnable(GL_POINT_SMOOTH);
 599
 600                 float quadratic[3] = {1.0, 0.001, 0.0000001};
 601                 // makes the points fade as they move away
 602                 glPointParameterfvPtr(GL_DISTANCE_ATTENUATION_EXT, quadratic);
 603                 glPointParameterfPtr(GL_POINT_SIZE_MIN_EXT, 1.0);
 604             }
 605
 606             glPointSize(4.0);
 607
 608             // blending function for runway lights
 609             glBlendFunc ( GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA) ;
 610         }
 611
 612         glTexGeni(GL_S, GL_TEXTURE_GEN_MODE, GL_SPHERE_MAP);
 613         glTexGeni(GL_T, GL_TEXTURE_GEN_MODE, GL_SPHERE_MAP);
 614         glEnable(GL_TEXTURE_GEN_S);
 615         glEnable(GL_TEXTURE_GEN_T);
 616         glPolygonMode(GL_FRONT, GL_POINT);
 617
 618         // draw runway lighting
 619         if ( draw_otw ) {
 620             ssgCullAndDraw( globals->get_scenery()->get_vasi_lights_root() );
 621             ssgCullAndDraw( globals->get_scenery()->get_rwy_lights_root() );
 622         }
 623
 624         // change punch through and then draw taxi lighting
 625         glFogf ( GL_FOG_DENSITY, fog_exp2_density );
 626         // sgVec3 taxi_fog;
 627         // sgSetVec3( taxi_fog, 0.0, 0.0, 0.0 );
 628         // glFogfv ( GL_FOG_COLOR, taxi_fog );
 629         if ( draw_otw ) {
 630             ssgCullAndDraw( globals->get_scenery()->get_taxi_lights_root() );
 631         }
 632
 633         // clean up lighting
 634         glPolygonMode(GL_FRONT, GL_FILL);
 635         glDisable(GL_TEXTURE_GEN_S);
 636         glDisable(GL_TEXTURE_GEN_T);
 637
 638         //static int _frame_count = 0;
 639         //if (_frame_count % 30 == 0) {
 640         //  printf("SSG: %s\n", ssgShowStats());
 641         //}
 642         //else {
 643         //  ssgShowStats();
 644         //}
 645         //_frame_count++;
 646
 647
 648         if ( enhanced_lighting ) {
 649             if ( distance_attenuation && glPointParameterIsSupported ) {
 650                 glPointParameterfvPtr(GL_DISTANCE_ATTENUATION_EXT,
 651                                       default_attenuation);
 652             }
 653
 654             glPointSize(1.0);
 655             glDisable(GL_POINT_SMOOTH);
 656         }
 657
 658         // draw ground lighting
 659         glFogf (GL_FOG_DENSITY, ground_exp2_punch_through);
 660         if ( draw_otw ) {
 661             ssgCullAndDraw( globals->get_scenery()->get_gnd_lights_root() );
 662         }
 663
 664         if ( draw_otw && fgGetBool("/sim/rendering/clouds3d") ) {
 665             glDisable( GL_FOG );
 666             glDisable( GL_LIGHTING );
 667             // cout << "drawing new clouds" << endl;
 668
 669             glEnable(GL_DEPTH_TEST);
 670             glEnable(GL_BLEND);
 671             glBlendFunc( GL_ONE, GL_ONE_MINUS_SRC_ALPHA ) ;
 672
 673             /*
 674             glEnable( GL_TEXTURE_2D );
 675             glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
 676             glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
 677             glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
 678             glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
 679             */
 680
 681 #ifdef FG_USE_CLOUDS_3D
 682             sgClouds3d->Draw((sgVec4 *)current__view->get_VIEW());
 683 #endif
 684             glEnable( GL_FOG );
 685             glEnable( GL_LIGHTING );
 686             glEnable( GL_DEPTH_TEST );
 687             glBlendFunc ( GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA ) ;
 688         }
 689
 690         if ( draw_otw && draw_clouds ) {
 691             if ( multi_pass_clouds ) {
 692                 // Disable depth buffer update, draw the clouds where the
 693                 //  objects overwrite the already drawn clouds, by testing
 694                 //  the stencil buffer against 1
 695                 glDepthMask( GL_FALSE );
 696                 glStencilFunc( GL_EQUAL, 1, 1 );
 697                 glStencilOp( GL_KEEP, GL_KEEP, GL_KEEP );
 698                 thesky->drawUpperClouds();
 699                 thesky->drawLowerClouds();
 700                 glDepthMask( GL_TRUE );
 701                 glDisable( GL_STENCIL_TEST );
 702             } else {
 703                 glDepthMask( GL_FALSE );
 704                 thesky->drawLowerClouds();
 705                 glDepthMask( GL_TRUE );
 706             }
 707         }
 708
 709         if ( draw_otw ) {
 710             FGTileMgr::set_tile_filter( false );
 711             sgSetModelFilter( false );
 712             globals->get_aircraft_model()->select( true );
 713             globals->get_model_mgr()->draw();
 714             globals->get_aircraft_model()->draw();
 715             // If the view is internal, the previous line draw the
 716             //  cockpit with modified near/far clip planes and deselect
 717             //  the aircraft in the global scenegraph
 718             // Otherwise, it just enables the aircraft: The scenegraph
 719             //  must be drawn again to see the plane.
 720             ssgCullAndDraw( globals->get_scenery()->get_scene_graph() );
 721             FGTileMgr::set_tile_filter( true );
 722             sgSetModelFilter( true );
 723             globals->get_aircraft_model()->select( true );
 724         }
 725
 726         // display HUD && Panel
 727         glDisable( GL_FOG );
 728         glDisable( GL_DEPTH_TEST );
 729         // glDisable( GL_CULL_FACE );
 730         // glDisable( GL_TEXTURE_2D );
 731
 732         // update the controls subsystem
 733         globals->get_controls()->update(delta_time_sec);
 734
 735         hud_and_panel->apply();
 736         fgCockpitUpdate();
 737
 738         // Use the hud_and_panel ssgSimpleState for rendering the ATC output
 739         // This only works properly if called before the panel call
 740         if((fgGetBool("/sim/ATC/enabled")) || (fgGetBool("/sim/ai-traffic/enabled")))
 741             globals->get_ATC_display()->update(delta_time_sec);
 742
 743         // update the panel subsystem
 744         if ( globals->get_current_panel() != NULL ) {
 745             globals->get_current_panel()->update(delta_time_sec);
 746         }
 747         fgUpdate3DPanels();
 748
 749         // We can do translucent menus, so why not. :-)
 750         menus->apply();
 751         glBlendFunc ( GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA ) ;
 752         puDisplay();
 753         // glDisable ( GL_BLEND ) ;
 754
 755         glEnable( GL_DEPTH_TEST );
 756         glEnable( GL_FOG );
 757
 758         // Fade out the splash screen over the first three seconds.
 759         double t = globals->get_sim_time_sec();
 760         if ( t <= 1.0 ) {
 761             fgSplashUpdate(0.0, 1.0);
 762         } else if ( t <= 3.0) {
 763             fgSplashUpdate(0.0, (3.0 - t) / 2.0);
 764         }
 765     }
 766 }
 767
 768
 769
 770 // options.cxx needs to see this for toggle_panel()
 771 // Handle new window size or exposure
 772 void
 773 FGRenderer::resize( int width, int height ) {
 774     int view_h;
 775
 776     if ( (!fgGetBool("/sim/virtual-cockpit"))
 777          && fgPanelVisible() && idle_state == 1000 ) {
 778         view_h = (int)(height * (globals->get_current_panel()->getViewHeight() -
 779                              globals->get_current_panel()->getYOffset()) / 768.0);
 780     } else {
 781         view_h = height;
 782     }
 783
 784     glViewport( 0, (GLint)(height - view_h), (GLint)(width), (GLint)(view_h) );
 785
 786     fgSetInt("/sim/startup/xsize", width);
 787     fgSetInt("/sim/startup/ysize", height);
 788     guiInitMouse(width, height);
 789
 790     // for all views
 791     FGViewMgr *viewmgr = globals->get_viewmgr();
 792     if (viewmgr) {
 793       for ( int i = 0; i < viewmgr->size(); ++i ) {
 794         viewmgr->get_view(i)->
 795           set_aspect_ratio((float)view_h / (float)width);
 796       }
 797
 798       setFOV( viewmgr->get_current_view()->get_h_fov(),
 799               viewmgr->get_current_view()->get_v_fov() );
 800
 801 #ifdef FG_USE_CLOUDS_3D
 802       sgClouds3d->Resize( viewmgr->get_current_view()->get_h_fov(),
 803                           viewmgr->get_current_view()->get_v_fov() );
 804 #endif
 805     }
 806
 807     fgHUDReshape();
 808
 809 }
 810
 811
 812 // These are wrapper functions around ssgSetNearFar() and ssgSetFOV()
 813 // which will post process and rewrite the resulting frustum if we
 814 // want to do asymmetric view frustums.
 815
 816 static void fgHackFrustum() {
 817
 818     /* experiment in assymetric view frustums */
 819     sgFrustum *f = ssgGetFrustum();
 820     cout << " l = " << f->getLeft()
 821          << " r = " << f->getRight()
 822          << " b = " << f->getBot()
 823          << " t = " << f->getTop()
 824          << " n = " << f->getNear()
 825          << " f = " << f->getFar()
 826          << endl;
 827     static double incr = 0.0;
 828     double factor = (sin(incr) + 1.0) / 2.0; // map to [0-1]
 829     double w = (f->getRight() - f->getLeft()) / 2.0;
 830     double l = f->getLeft() + w * factor;
 831     double r = l + w;
 832     ssgSetFrustum(l, r, f->getBot(), f->getTop(), f->getNear(), f->getFar());
 833     incr += 0.001;
 834 }
 835
 836
 837 // we need some static storage space for these values.  However, we
 838 // can't store it in a renderer class object because the functions
 839 // that manipulate these are static.  They are static so they can
 840 // interface to the display callback system.  There's probably a
 841 // better way, there has to be a better way, but I'm not seeing it
 842 // right now.
 843 static float width, height, near, far;
 844
 845
 846 /** FlightGear code should use this routine to set the FOV rather than
 847  *  calling the ssg routine directly
 848  */
 849 void FGRenderer::setFOV( float w, float h ) {
 850     width = w;
 851     height = h;
 852
 853     // fully specify the view frustum before hacking it (so we don't
 854     // accumulate hacked effects
 855     ssgSetFOV( w, h );
 856     ssgSetNearFar( near, far );
 857
 858     fgHackFrustum();
 859 }
 860
 861
 862 /** FlightGear code should use this routine to set the Near/Far clip
 863  *  planes rather than calling the ssg routine directly
 864  */
 865 void FGRenderer::setNearFar( float n, float f ) {
 866     near = n;
 867     far = f;
 868
 869     // fully specify the view frustum before hacking it (so we don't
 870     // accumulate hacked effects
 871     ssgSetNearFar( n, f );
 872     ssgSetFOV( width, height );
 873
 874     fgHackFrustum();
 875 }
 876
 877 // end of renderer.cxx