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  - curt@flightgear.org
   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
  49 #ifdef FG_USE_CLOUDS_3D
  50 #  include <simgear/scene/sky/clouds3d/SkySceneLoader.hpp>
  51 #  include <simgear/scene/sky/clouds3d/SkyUtil.hpp>
  52 #endif
  53
  54 #include <Scenery/tileentry.hxx>
  55 #include <Time/light.hxx>
  56 #include <Time/light.hxx>
  57 #include <Aircraft/aircraft.hxx>
  58 #include <Cockpit/panel.hxx>
  59 #include <Cockpit/cockpit.hxx>
  60 #include <Cockpit/radiostack.hxx>
  61 #include <Cockpit/hud.hxx>
  62 #include <Model/panelnode.hxx>
  63 #include <Model/modelmgr.hxx>
  64 #include <Model/acmodel.hxx>
  65 #include <Scenery/scenery.hxx>
  66 #include <Scenery/tilemgr.hxx>
  67 #include <ATC/ATCdisplay.hxx>
  68 #include <Replay/replay.hxx>
  69 #include <GUI/new_gui.hxx>
  70
  71 #include "splash.hxx"
  72 #include "renderer.hxx"
  73 #include "main.hxx"
  74
  75
  76 float default_attenuation[3] = {1.0, 0.0, 0.0};
  77
  78 ssgSelector *lightpoints_brightness = new ssgSelector;
  79 ssgTransform *lightpoints_transform = new ssgTransform;
  80 FGTileEntry *dummy_tile;
  81 sgVec3 rway_ols;
  82
  83 // Clip plane settings...
  84 float scene_nearplane = 0.5f;
  85 float scene_farplane = 120000.0f;
  86
  87 glPointParameterfProc glPointParameterfPtr = 0;
  88 glPointParameterfvProc glPointParameterfvPtr = 0;
  89 bool glPointParameterIsSupported = false;
  90
  91
  92 // fog constants.  I'm a little nervous about putting actual code out
  93 // here but it seems to work (?)
  94 static const double m_log01 = -log( 0.01 );
  95 static const double sqrt_m_log01 = sqrt( m_log01 );
  96 static GLfloat fog_exp_density;
  97 static GLfloat fog_exp2_density;
  98 static GLfloat rwy_exp2_punch_through;
  99 static GLfloat taxi_exp2_punch_through;
 100 static GLfloat ground_exp2_punch_through;
 101
 102 // Sky structures
 103 SGSky *thesky;
 104
 105 #ifdef FG_USE_CLOUDS_3D
 106   SkySceneLoader *sgClouds3d;
 107   bool _bcloud_orig = true;
 108 #endif
 109
 110 // hack
 111 sgMat4 copy_of_ssgOpenGLAxisSwapMatrix =
 112 {
 113   {  1.0f,  0.0f,  0.0f,  0.0f },
 114   {  0.0f,  0.0f, -1.0f,  0.0f },
 115   {  0.0f,  1.0f,  0.0f,  0.0f },
 116   {  0.0f,  0.0f,  0.0f,  1.0f }
 117 };
 118
 119 ssgSimpleState *cloud3d_imposter_state;
 120 ssgSimpleState *default_state;
 121 ssgSimpleState *hud_and_panel;
 122 ssgSimpleState *menus;
 123
 124
 125 void
 126 FGRenderer::build_states( void ) {
 127     default_state = new ssgSimpleState;
 128     default_state->ref();
 129     default_state->disable( GL_TEXTURE_2D );
 130     default_state->enable( GL_CULL_FACE );
 131     default_state->enable( GL_COLOR_MATERIAL );
 132     default_state->setColourMaterial( GL_AMBIENT_AND_DIFFUSE );
 133     default_state->setMaterial( GL_EMISSION, 0, 0, 0, 1 );
 134     default_state->setMaterial( GL_SPECULAR, 0, 0, 0, 1 );
 135     default_state->disable( GL_BLEND );
 136     default_state->disable( GL_ALPHA_TEST );
 137     default_state->disable( GL_LIGHTING );
 138
 139     cloud3d_imposter_state = new ssgSimpleState;
 140     cloud3d_imposter_state->ref();
 141     cloud3d_imposter_state->enable( GL_TEXTURE_2D );
 142     cloud3d_imposter_state->enable( GL_CULL_FACE );
 143     cloud3d_imposter_state->enable( GL_COLOR_MATERIAL );
 144     cloud3d_imposter_state->setColourMaterial( GL_AMBIENT_AND_DIFFUSE );
 145     cloud3d_imposter_state->setMaterial( GL_DIFFUSE, 1, 1, 1, 1 );
 146     cloud3d_imposter_state->setMaterial( GL_AMBIENT, 1, 1, 1, 1 );
 147     cloud3d_imposter_state->setMaterial( GL_EMISSION, 0, 0, 0, 1 );
 148     cloud3d_imposter_state->setMaterial( GL_SPECULAR, 0, 0, 0, 1 );
 149     cloud3d_imposter_state->enable( GL_BLEND );
 150     cloud3d_imposter_state->enable( GL_ALPHA_TEST );
 151     cloud3d_imposter_state->disable( GL_LIGHTING );
 152
 153     hud_and_panel = new ssgSimpleState;
 154     hud_and_panel->ref();
 155     hud_and_panel->disable( GL_CULL_FACE );
 156     hud_and_panel->disable( GL_TEXTURE_2D );
 157     hud_and_panel->disable( GL_LIGHTING );
 158     hud_and_panel->enable( GL_BLEND );
 159
 160     menus = new ssgSimpleState;
 161     menus->ref();
 162     menus->disable( GL_CULL_FACE );
 163     menus->disable( GL_TEXTURE_2D );
 164     menus->enable( GL_BLEND );
 165 }
 166
 167
 168 // Initialize various GL/view parameters
 169 void
 170 FGRenderer::init( void ) {
 171
 172     FGLight *l = (FGLight *)(globals->get_subsystem("lighting"));
 173
 174     // Go full screen if requested ...
 175     if ( fgGetBool("/sim/startup/fullscreen") ) {
 176         fgOSFullScreen();
 177     }
 178
 179     // If enabled, normal vectors specified with glNormal are scaled
 180     // to unit length after transformation.  Enabling this has
 181     // performance implications.  See the docs for glNormal.
 182     // glEnable( GL_NORMALIZE );
 183
 184     glEnable( GL_LIGHTING );
 185     glEnable( GL_LIGHT0 );
 186     // glLightfv( GL_LIGHT0, GL_POSITION, l->sun_vec );  // done later with ssg
 187
 188     sgVec3 sunpos;
 189     sgSetVec3( sunpos, l->sun_vec()[0], l->sun_vec()[1], l->sun_vec()[2] );
 190     ssgGetLight( 0 ) -> setPosition( sunpos );
 191
 192     glFogi (GL_FOG_MODE, GL_EXP2);
 193     if ( (!strcmp(fgGetString("/sim/rendering/fog"), "disabled")) ||
 194          (!fgGetBool("/sim/rendering/shading"))) {
 195         // if fastest fog requested, or if flat shading force fastest
 196         glHint ( GL_FOG_HINT, GL_FASTEST );
 197     } else if ( !strcmp(fgGetString("/sim/rendering/fog"), "nicest") ) {
 198         glHint ( GL_FOG_HINT, GL_NICEST );
 199     }
 200     if ( fgGetBool("/sim/rendering/wireframe") ) {
 201         // draw wire frame
 202         glPolygonMode( GL_FRONT_AND_BACK, GL_LINE );
 203     }
 204
 205     // This is the default anyways, but it can't hurt
 206     glFrontFace ( GL_CCW );
 207
 208     // Just testing ...
 209     // glEnable(GL_POINT_SMOOTH);
 210     // glEnable(GL_LINE_SMOOTH);
 211     // glEnable(GL_POLYGON_SMOOTH);
 212 }
 213
 214
 215 // For HiRes screen Dumps using Brian Pauls TR Library
 216 void
 217 FGRenderer::screendump( void ) {
 218 #ifdef FG_ENABLE_MULTIPASS_CLOUDS
 219     bool multi_pass_clouds = fgGetBool("/sim/rendering/multi-pass-clouds") &&
 220                             !SGCloudLayer::enable_bump_mapping; // ugly artefact now
 221 #else
 222     bool multi_pass_clouds = false;
 223 #endif
 224     bool draw_clouds = fgGetBool("/environment/clouds/status");
 225
 226     if ( fgPanelVisible() ) {
 227         GLfloat height = fgGetInt("/sim/startup/ysize");
 228         GLfloat view_h =
 229             (globals->get_current_panel()->getViewHeight() - globals->get_current_panel()->getYOffset())
 230             * (height / 768.0) + 1;
 231         glTranslatef( 0.0, view_h, 0.0 );
 232     }
 233
 234     static GLfloat black[4] = { 0.0, 0.0, 0.0, 1.0 };
 235     static GLfloat white[4] = { 1.0, 1.0, 1.0, 1.0 };
 236
 237     FGLight *l = (FGLight *)(globals->get_subsystem("lighting"));
 238
 239     glClearColor(l->adj_fog_color()[0], l->adj_fog_color()[1],
 240                  l->adj_fog_color()[2], l->adj_fog_color()[3]);
 241
 242     glClear( GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT );
 243
 244     // set the opengl state to known default values
 245     default_state->force();
 246
 247     glEnable( GL_FOG );
 248     glFogf  ( GL_FOG_DENSITY, fog_exp2_density);
 249     glFogi  ( GL_FOG_MODE,    GL_EXP2 );
 250     glFogfv ( GL_FOG_COLOR,   l->adj_fog_color() );
 251
 252     // GL_LIGHT_MODEL_AMBIENT has a default non-zero value so if
 253     // we only update GL_AMBIENT for our lights we will never get
 254     // a completely dark scene.  So, we set GL_LIGHT_MODEL_AMBIENT
 255     // explicitely to black.
 256     glLightModelfv( GL_LIGHT_MODEL_AMBIENT, black );
 257     glLightModeli( GL_LIGHT_MODEL_LOCAL_VIEWER, GL_FALSE );
 258
 259     ssgGetLight( 0 ) -> setColour( GL_AMBIENT, l->scene_ambient() );
 260
 261     // texture parameters
 262     glTexEnvi( GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE ) ;
 263     glHint( GL_PERSPECTIVE_CORRECTION_HINT, GL_NICEST ) ;
 264
 265     // we need a white diffuse light for the phase of the moon
 266     ssgGetLight( 0 ) -> setColour( GL_DIFFUSE, white );
 267     thesky->preDraw( cur_fdm_state->get_Altitude() * SG_FEET_TO_METER,
 268                      fog_exp2_density );
 269
 270     // draw the ssg scene
 271     // return to the desired diffuse color
 272     ssgGetLight( 0 ) -> setColour( GL_DIFFUSE, l->scene_diffuse() );
 273     glEnable( GL_DEPTH_TEST );
 274     ssgSetNearFar( scene_nearplane, scene_farplane );
 275     if ( draw_clouds ) {
 276         // Draw the terrain
 277         FGTileMgr::set_tile_filter( true );
 278         sgSetModelFilter( false );
 279         globals->get_aircraft_model()->select( false );
 280         ssgCullAndDraw( globals->get_scenery()->get_scene_graph() );
 281         // Disable depth buffer update, draw the clouds
 282         glDepthMask( GL_FALSE );
 283         thesky->drawUpperClouds();
 284         if ( multi_pass_clouds ) {
 285             thesky->drawLowerClouds();
 286         }
 287         glDepthMask( GL_TRUE );
 288         if ( multi_pass_clouds ) {
 289             // Draw the objects except the aircraft
 290             //  and update the stencil buffer with 1
 291             glEnable( GL_STENCIL_TEST );
 292             glStencilFunc( GL_ALWAYS, 1, 1 );
 293             glStencilOp( GL_KEEP, GL_KEEP, GL_REPLACE );
 294         }
 295         FGTileMgr::set_tile_filter( false );
 296         sgSetModelFilter( true );
 297         ssgCullAndDraw( globals->get_scenery()->get_scene_graph() );
 298     } else {
 299         FGTileMgr::set_tile_filter( true );
 300         sgSetModelFilter( true );
 301         globals->get_aircraft_model()->select( false );
 302         ssgCullAndDraw( globals->get_scenery()->get_scene_graph() );
 303     }
 304
 305     // draw the lights
 306     glFogf (GL_FOG_DENSITY, rwy_exp2_punch_through);
 307     ssgSetNearFar( scene_nearplane, scene_farplane );
 308     ssgCullAndDraw( globals->get_scenery()->get_vasi_lights_root() );
 309     ssgCullAndDraw( globals->get_scenery()->get_rwy_lights_root() );
 310
 311     ssgCullAndDraw( globals->get_scenery()->get_gnd_lights_root() );
 312
 313     if ( draw_clouds ) {
 314         if ( multi_pass_clouds ) {
 315             // Disable depth buffer update, draw the clouds where the
 316             //  objects overwrite the already drawn clouds, by testing
 317             //  the stencil buffer against 1
 318             glDepthMask( GL_FALSE );
 319             glStencilFunc( GL_EQUAL, 1, 1 );
 320             glStencilOp( GL_KEEP, GL_KEEP, GL_KEEP );
 321             thesky->drawUpperClouds();
 322             thesky->drawLowerClouds();
 323             glDepthMask( GL_TRUE );
 324             glDisable( GL_STENCIL_TEST );
 325         } else {
 326             glDepthMask( GL_FALSE );
 327             thesky->drawLowerClouds();
 328             glDepthMask( GL_TRUE );
 329         }
 330     }
 331
 332     globals->get_aircraft_model()->select( true );
 333     globals->get_model_mgr()->draw();
 334     globals->get_aircraft_model()->draw();
 335 }
 336
 337
 338 // Update all Visuals (redraws anything graphics related)
 339 void
 340 FGRenderer::update() {
 341     bool scenery_loaded = fgGetBool("sim/sceneryloaded") || fgGetBool("sim/sceneryloaded-override");
 342     bool draw_otw = fgGetBool("/sim/rendering/draw-otw");
 343     bool skyblend = fgGetBool("/sim/rendering/skyblend");
 344     bool enhanced_lighting = fgGetBool("/sim/rendering/enhanced-lighting");
 345     bool distance_attenuation = fgGetBool("/sim/rendering/distance-attenuation");
 346 #ifdef FG_ENABLE_MULTIPASS_CLOUDS
 347     bool multi_pass_clouds = fgGetBool("/sim/rendering/multi-pass-clouds") &&
 348                                 !SGCloudLayer::enable_bump_mapping;  // ugly artefact now
 349 #else
 350     bool multi_pass_clouds = false;
 351 #endif
 352     bool draw_clouds = fgGetBool("/environment/clouds/status");
 353
 354     GLfloat black[4] = { 0.0, 0.0, 0.0, 1.0 };
 355     GLfloat white[4] = { 1.0, 1.0, 1.0, 1.0 };
 356
 357     // static const SGPropertyNode *longitude
 358     //     = fgGetNode("/position/longitude-deg");
 359     // static const SGPropertyNode *latitude
 360     //     = fgGetNode("/position/latitude-deg");
 361     // static const SGPropertyNode *altitude
 362     //     = fgGetNode("/position/altitude-ft");
 363     static const SGPropertyNode *groundlevel_nearplane
 364         = fgGetNode("/sim/current-view/ground-level-nearplane-m");
 365
 366     FGLight *l = (FGLight *)(globals->get_subsystem("lighting"));
 367     static double last_visibility = -9999;
 368
 369     // update fog params
 370     double actual_visibility;
 371     if (fgGetBool("/environment/clouds/status"))
 372         actual_visibility = thesky->get_visibility();
 373     else
 374         actual_visibility = fgGetDouble("/environment/visibility-m");
 375     if ( actual_visibility != last_visibility ) {
 376         last_visibility = actual_visibility;
 377
 378         fog_exp_density = m_log01 / actual_visibility;
 379         fog_exp2_density = sqrt_m_log01 / actual_visibility;
 380         ground_exp2_punch_through = sqrt_m_log01 / (actual_visibility * 1.5);
 381         if ( actual_visibility < 8000 ) {
 382             rwy_exp2_punch_through = sqrt_m_log01 / (actual_visibility * 2.5);
 383             taxi_exp2_punch_through = sqrt_m_log01 / (actual_visibility * 1.5);
 384         } else {
 385             rwy_exp2_punch_through = sqrt_m_log01 / ( 8000 * 2.5 );
 386             taxi_exp2_punch_through = sqrt_m_log01 / ( 8000 * 1.5 );
 387         }
 388     }
 389
 390     // double angle;
 391     // GLfloat black[4] = { 0.0, 0.0, 0.0, 1.0 };
 392     // GLfloat white[4] = { 1.0, 1.0, 1.0, 1.0 };
 393     // GLfloat terrain_color[4] = { 0.54, 0.44, 0.29, 1.0 };
 394     // GLfloat mat_shininess[] = { 10.0 };
 395     GLbitfield clear_mask;
 396
 397     if ( idle_state != 1000 || !scenery_loaded ) {
 398         // still initializing, draw the splash screen
 399         if ( fgGetBool("/sim/startup/splash-screen") ) {
 400             fgSplashUpdate(0.0, 1.0);
 401         }
 402         // Keep resetting sim time while the sim is initializing
 403         globals->set_sim_time_sec( 0.0 );
 404         SGAnimation::set_sim_time_sec( 0.0 );
 405     } else {
 406         // idle_state is now 1000 meaning we've finished all our
 407         // initializations and are running the main loop, so this will
 408         // now work without seg faulting the system.
 409
 410         FGViewer *current__view = globals->get_current_view();
 411
 412         // calculate our current position in cartesian space
 413         globals->get_scenery()->set_center( globals->get_scenery()->get_next_center() );
 414
 415         // update view port
 416         resize( fgGetInt("/sim/startup/xsize"),
 417                    fgGetInt("/sim/startup/ysize") );
 418
 419         if ( fgGetBool("/sim/rendering/clouds3d") ) {
 420             glClear( GL_DEPTH_BUFFER_BIT | GL_COLOR_BUFFER_BIT );
 421             cloud3d_imposter_state->force();
 422             glDisable( GL_FOG );
 423             glColor4f( 1.0, 1.0, 1.0, 1.0 );
 424             glEnable(GL_DEPTH_TEST);
 425             glEnable(GL_BLEND);
 426             glBlendFunc( GL_ONE, GL_ONE_MINUS_SRC_ALPHA ) ;
 427
 428 #ifdef FG_USE_CLOUDS_3D
 429             if ( _bcloud_orig ) {
 430                 Point3D c = globals->get_scenery()->get_center();
 431                 sgClouds3d->Set_Cloud_Orig( &c );
 432                 _bcloud_orig = false;
 433             }
 434             sgClouds3d->Update( current__view->get_absolute_view_pos() );
 435 #endif
 436             glBlendFunc( GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA ) ;
 437             glDisable(GL_DEPTH_TEST);
 438         }
 439
 440         clear_mask = GL_DEPTH_BUFFER_BIT;
 441         if ( fgGetBool("/sim/rendering/wireframe") ) {
 442             clear_mask |= GL_COLOR_BUFFER_BIT;
 443         }
 444
 445         if ( skyblend ) {
 446             if ( fgGetBool("/sim/rendering/textures") ) {
 447             // glClearColor(black[0], black[1], black[2], black[3]);
 448             glClearColor(l->adj_fog_color()[0], l->adj_fog_color()[1],
 449                          l->adj_fog_color()[2], l->adj_fog_color()[3]);
 450             clear_mask |= GL_COLOR_BUFFER_BIT;
 451             }
 452         } else {
 453             glClearColor(l->sky_color()[0], l->sky_color()[1],
 454                          l->sky_color()[2], l->sky_color()[3]);
 455             clear_mask |= GL_COLOR_BUFFER_BIT;
 456         }
 457         if ( multi_pass_clouds && draw_clouds ) {
 458             glClearStencil( 0 );
 459             clear_mask |= GL_STENCIL_BUFFER_BIT;
 460         }
 461         glClear( clear_mask );
 462
 463         // Tell GL we are switching to model view parameters
 464
 465         // I really should create a derived ssg node or use a call
 466         // back or something so that I can draw the sky within the
 467         // ssgCullAndDraw() function, but for now I just mimic what
 468         // ssg does to set up the model view matrix
 469         glMatrixMode(GL_MODELVIEW);
 470         glLoadIdentity();
 471         ssgSetCamera( (sgVec4 *)current__view->get_VIEW() );
 472
 473         // set the opengl state to known default values
 474         default_state->force();
 475
 476         // update fog params if visibility has changed
 477         double visibility_meters = fgGetDouble("/environment/visibility-m");
 478         thesky->set_visibility(visibility_meters);
 479
 480         thesky->modify_vis( cur_fdm_state->get_Altitude() * SG_FEET_TO_METER,
 481                             ( global_multi_loop * fgGetInt("/sim/speed-up") )
 482                             / (double)fgGetInt("/sim/model-hz") );
 483
 484         // Set correct opengl fog density
 485         glFogf (GL_FOG_DENSITY, fog_exp2_density);
 486
 487         // update the sky dome
 488         if ( skyblend ) {
 489             /*
 490              SG_LOG( SG_GENERAL, SG_BULK, "thesky->repaint() sky_color = "
 491              << l->sky_color()[0] << " "
 492              << l->sky_color()[1] << " "
 493              << l->sky_color()[2] << " "
 494              << l->sky_color()[3] );
 495             SG_LOG( SG_GENERAL, SG_BULK, "    fog = "
 496              << l->fog_color()[0] << " "
 497              << l->fog_color()[1] << " "
 498              << l->fog_color()[2] << " "
 499              << l->fog_color()[3] );
 500             SG_LOG( SG_GENERAL, SG_BULK,
 501                     "    sun_angle = " << l->sun_angle
 502              << "    moon_angle = " << l->moon_angle );
 503             */
 504
 505             static SGSkyColor scolor;
 506             FGLight *l = (FGLight *)(globals->get_subsystem("lighting"));
 507
 508             scolor.sky_color   = l->sky_color();
 509             scolor.fog_color   = l->adj_fog_color();
 510             scolor.cloud_color = l->cloud_color();
 511             scolor.sun_angle   = l->get_sun_angle();
 512             scolor.moon_angle  = l->get_moon_angle();
 513             scolor.nplanets    = globals->get_ephem()->getNumPlanets();
 514             scolor.nstars      = globals->get_ephem()->getNumStars();
 515             scolor.planet_data = globals->get_ephem()->getPlanets();
 516             scolor.star_data   = globals->get_ephem()->getStars();
 517
 518             thesky->repaint( scolor );
 519
 520             /*
 521             SG_LOG( SG_GENERAL, SG_BULK,
 522                     "thesky->reposition( view_pos = " << view_pos[0] << " "
 523              << view_pos[1] << " " << view_pos[2] );
 524             SG_LOG( SG_GENERAL, SG_BULK,
 525                     "    zero_elev = " << zero_elev[0] << " "
 526              << zero_elev[1] << " " << zero_elev[2]
 527              << " lon = " << cur_fdm_state->get_Longitude()
 528              << " lat = " << cur_fdm_state->get_Latitude() );
 529             SG_LOG( SG_GENERAL, SG_BULK,
 530                     "    sun_rot = " << l->get_sun_rotation
 531              << " gst = " << SGTime::cur_time_params->getGst() );
 532             SG_LOG( SG_GENERAL, SG_BULK,
 533                  "    sun ra = " << globals->get_ephem()->getSunRightAscension()
 534               << " sun dec = " << globals->get_ephem()->getSunDeclination()
 535               << " moon ra = " << globals->get_ephem()->getMoonRightAscension()
 536               << " moon dec = " << globals->get_ephem()->getMoonDeclination() );
 537             */
 538
 539             // The sun and moon distances are scaled down versions
 540             // of the actual distance to get both the moon and the sun
 541             // within the range of the far clip plane.
 542             // Moon distance:    384,467 kilometers
 543             // Sun distance: 150,000,000 kilometers
 544             double sun_horiz_eff, moon_horiz_eff;
 545             if (fgGetBool("/sim/rendering/horizon-effect")) {
 546             sun_horiz_eff = 0.67+pow(0.5+cos(l->get_sun_angle())*2/2, 0.33)/3;
 547             moon_horiz_eff = 0.67+pow(0.5+cos(l->get_moon_angle())*2/2, 0.33)/3;
 548             } else {
 549                sun_horiz_eff = moon_horiz_eff = 1.0;
 550             }
 551
 552             static SGSkyState sstate;
 553
 554             sstate.view_pos  = current__view->get_view_pos();
 555             sstate.zero_elev = current__view->get_zero_elev();
 556             sstate.view_up   = current__view->get_world_up();
 557             sstate.lon       = current__view->getLongitude_deg()
 558                                 * SGD_DEGREES_TO_RADIANS;
 559             sstate.lat       = current__view->getLatitude_deg()
 560                                 * SGD_DEGREES_TO_RADIANS;
 561             sstate.alt       = current__view->getAltitudeASL_ft()
 562                                 * SG_FEET_TO_METER;
 563             sstate.spin      = l->get_sun_rotation();
 564             sstate.gst       = globals->get_time_params()->getGst();
 565             sstate.sun_ra    = globals->get_ephem()->getSunRightAscension();
 566             sstate.sun_dec   = globals->get_ephem()->getSunDeclination();
 567             sstate.sun_dist  = 50000.0 * sun_horiz_eff;
 568             sstate.moon_ra   = globals->get_ephem()->getMoonRightAscension();
 569             sstate.moon_dec  = globals->get_ephem()->getMoonDeclination();
 570             sstate.moon_dist = 40000.0 * moon_horiz_eff;
 571
 572             thesky->reposition( sstate, delta_time_sec );
 573         }
 574
 575         glEnable( GL_DEPTH_TEST );
 576         if ( strcmp(fgGetString("/sim/rendering/fog"), "disabled") ) {
 577             glEnable( GL_FOG );
 578             glFogi( GL_FOG_MODE, GL_EXP2 );
 579             glFogfv( GL_FOG_COLOR, l->adj_fog_color() );
 580         }
 581
 582         // set sun/lighting parameters
 583         ssgGetLight( 0 ) -> setPosition( l->sun_vec() );
 584
 585         // GL_LIGHT_MODEL_AMBIENT has a default non-zero value so if
 586         // we only update GL_AMBIENT for our lights we will never get
 587         // a completely dark scene.  So, we set GL_LIGHT_MODEL_AMBIENT
 588         // explicitely to black.
 589         glLightModelfv( GL_LIGHT_MODEL_AMBIENT, black );
 590
 591         ssgGetLight( 0 ) -> setColour( GL_AMBIENT, l->scene_ambient() );
 592         ssgGetLight( 0 ) -> setColour( GL_DIFFUSE, l->scene_diffuse() );
 593         ssgGetLight( 0 ) -> setColour( GL_SPECULAR, l->scene_specular() );
 594
 595         // texture parameters
 596         // glEnable( GL_TEXTURE_2D );
 597         glTexEnvi( GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE ) ;
 598         glHint( GL_PERSPECTIVE_CORRECTION_HINT, GL_NICEST ) ;
 599
 600         // glMatrixMode( GL_PROJECTION );
 601         // glLoadIdentity();
 602         ssgSetFOV( current__view->get_h_fov(),
 603                    current__view->get_v_fov() );
 604
 605         double agl =
 606             current_aircraft.fdm_state->get_Altitude() * SG_FEET_TO_METER
 607             - globals->get_scenery()->get_cur_elev();
 608
 609         if ( agl > 10.0 ) {
 610             scene_nearplane = 10.0f;
 611             scene_farplane = 120000.0f;
 612         } else {
 613             scene_nearplane = groundlevel_nearplane->getDoubleValue();
 614             scene_farplane = 120000.0f;
 615         }
 616
 617         ssgSetNearFar( scene_nearplane, scene_farplane );
 618
 619         if ( draw_otw && skyblend ) {
 620             // draw the sky backdrop
 621
 622             // we need a white diffuse light for the phase of the moon
 623             ssgGetLight( 0 ) -> setColour( GL_DIFFUSE, white );
 624             thesky->preDraw( cur_fdm_state->get_Altitude() * SG_FEET_TO_METER,
 625                              fog_exp2_density );
 626             // return to the desired diffuse color
 627             ssgGetLight( 0 ) -> setColour( GL_DIFFUSE, l->scene_diffuse() );
 628         }
 629
 630         // draw the ssg scene
 631         glEnable( GL_DEPTH_TEST );
 632
 633         ssgSetNearFar( scene_nearplane, scene_farplane );
 634
 635         if ( fgGetBool("/sim/rendering/wireframe") ) {
 636             // draw wire frame
 637             glPolygonMode( GL_FRONT_AND_BACK, GL_LINE );
 638         }
 639         if ( draw_otw ) {
 640             if ( draw_clouds ) {
 641
 642                 // Draw the terrain
 643                 FGTileMgr::set_tile_filter( true );
 644                 sgSetModelFilter( false );
 645                 globals->get_aircraft_model()->select( false );
 646                 ssgCullAndDraw( globals->get_scenery()->get_scene_graph() );
 647
 648                 // Disable depth buffer update, draw the clouds
 649                 glDepthMask( GL_FALSE );
 650                 thesky->drawUpperClouds();
 651                 if ( multi_pass_clouds ) {
 652                     thesky->drawLowerClouds();
 653                 }
 654                 glDepthMask( GL_TRUE );
 655
 656                 if ( multi_pass_clouds ) {
 657                     // Draw the objects except the aircraft
 658                     //  and update the stencil buffer with 1
 659                     glEnable( GL_STENCIL_TEST );
 660                     glStencilFunc( GL_ALWAYS, 1, 1 );
 661                     glStencilOp( GL_KEEP, GL_KEEP, GL_REPLACE );
 662                 }
 663                 FGTileMgr::set_tile_filter( false );
 664                 sgSetModelFilter( true );
 665                 ssgCullAndDraw( globals->get_scenery()->get_scene_graph() );
 666             } else {
 667                 FGTileMgr::set_tile_filter( true );
 668                 sgSetModelFilter( true );
 669                 globals->get_aircraft_model()->select( false );
 670                 ssgCullAndDraw( globals->get_scenery()->get_scene_graph() );
 671             }
 672         }
 673
 674         // This is a bit kludgy.  Every 200 frames, do an extra
 675         // traversal of the scene graph without drawing anything, but
 676         // with the field-of-view set to 360x360 degrees.  This
 677         // ensures that out-of-range random objects that are not in
 678         // the current view frustum will still be freed properly.
 679         static int counter = 0;
 680         counter++;
 681         if (counter == 200) {
 682             sgFrustum f;
 683             f.setFOV(360, 360);
 684                     // No need to put the near plane too close;
 685                     // this way, at least the aircraft can be
 686                     // culled.
 687             f.setNearFar(1000, 1000000);
 688             sgMat4 m;
 689             ssgGetModelviewMatrix(m);
 690             FGTileMgr::set_tile_filter( true );
 691             sgSetModelFilter( true );
 692             globals->get_scenery()->get_scene_graph()->cull(&f, m, true);
 693             counter = 0;
 694         }
 695
 696         // change state for lighting here
 697
 698         // draw runway lighting
 699         glFogf (GL_FOG_DENSITY, rwy_exp2_punch_through);
 700         ssgSetNearFar( scene_nearplane, scene_farplane );
 701
 702         if ( enhanced_lighting ) {
 703
 704             // Enable states for drawing points with GL_extension
 705             glEnable(GL_POINT_SMOOTH);
 706
 707             if ( distance_attenuation && glPointParameterIsSupported )
 708             {
 709                 // Enable states for drawing points with GL_extension
 710                 glEnable(GL_POINT_SMOOTH);
 711
 712                 float quadratic[3] = {1.0, 0.001, 0.0000001};
 713                 // makes the points fade as they move away
 714                 glPointParameterfvPtr(GL_DISTANCE_ATTENUATION_EXT, quadratic);
 715                 glPointParameterfPtr(GL_POINT_SIZE_MIN_EXT, 1.0);
 716             }
 717
 718             glPointSize(4.0);
 719
 720             // blending function for runway lights
 721             glBlendFunc ( GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA) ;
 722         }
 723
 724         glTexGeni(GL_S, GL_TEXTURE_GEN_MODE, GL_SPHERE_MAP);
 725         glTexGeni(GL_T, GL_TEXTURE_GEN_MODE, GL_SPHERE_MAP);
 726         glEnable(GL_TEXTURE_GEN_S);
 727         glEnable(GL_TEXTURE_GEN_T);
 728         glPolygonMode(GL_FRONT, GL_POINT);
 729
 730         // draw runway lighting
 731         if ( draw_otw ) {
 732             ssgCullAndDraw( globals->get_scenery()->get_vasi_lights_root() );
 733             ssgCullAndDraw( globals->get_scenery()->get_rwy_lights_root() );
 734         }
 735
 736         // change punch through and then draw taxi lighting
 737         glFogf ( GL_FOG_DENSITY, fog_exp2_density );
 738         // sgVec3 taxi_fog;
 739         // sgSetVec3( taxi_fog, 0.0, 0.0, 0.0 );
 740         // glFogfv ( GL_FOG_COLOR, taxi_fog );
 741         if ( draw_otw ) {
 742             ssgCullAndDraw( globals->get_scenery()->get_taxi_lights_root() );
 743         }
 744
 745         // clean up lighting
 746         glPolygonMode(GL_FRONT, GL_FILL);
 747         glDisable(GL_TEXTURE_GEN_S);
 748         glDisable(GL_TEXTURE_GEN_T);
 749
 750         //static int _frame_count = 0;
 751         //if (_frame_count % 30 == 0) {
 752         //  printf("SSG: %s\n", ssgShowStats());
 753         //}
 754         //else {
 755         //  ssgShowStats();
 756         //}
 757         //_frame_count++;
 758
 759
 760         if ( enhanced_lighting ) {
 761             if ( distance_attenuation && glPointParameterIsSupported ) {
 762                 glPointParameterfvPtr(GL_DISTANCE_ATTENUATION_EXT,
 763                                       default_attenuation);
 764             }
 765
 766             glPointSize(1.0);
 767             glDisable(GL_POINT_SMOOTH);
 768         }
 769
 770         // draw ground lighting
 771         glFogf (GL_FOG_DENSITY, ground_exp2_punch_through);
 772         if ( draw_otw ) {
 773             ssgCullAndDraw( globals->get_scenery()->get_gnd_lights_root() );
 774         }
 775
 776         if ( draw_otw && fgGetBool("/sim/rendering/clouds3d") ) {
 777             glDisable( GL_FOG );
 778             glDisable( GL_LIGHTING );
 779             // cout << "drawing new clouds" << endl;
 780
 781             glEnable(GL_DEPTH_TEST);
 782             glEnable(GL_BLEND);
 783             glBlendFunc( GL_ONE, GL_ONE_MINUS_SRC_ALPHA ) ;
 784
 785             /*
 786             glEnable( GL_TEXTURE_2D );
 787             glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
 788             glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
 789             glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
 790             glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
 791             */
 792
 793 #ifdef FG_USE_CLOUDS_3D
 794             sgClouds3d->Draw((sgVec4 *)current__view->get_VIEW());
 795 #endif
 796             glEnable( GL_FOG );
 797             glEnable( GL_LIGHTING );
 798             glEnable( GL_DEPTH_TEST );
 799             glBlendFunc ( GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA ) ;
 800         }
 801
 802         if ( draw_otw && draw_clouds ) {
 803             if ( multi_pass_clouds ) {
 804                 // Disable depth buffer update, draw the clouds where the
 805                 //  objects overwrite the already drawn clouds, by testing
 806                 //  the stencil buffer against 1
 807                 glDepthMask( GL_FALSE );
 808                 glStencilFunc( GL_EQUAL, 1, 1 );
 809                 glStencilOp( GL_KEEP, GL_KEEP, GL_KEEP );
 810                 thesky->drawUpperClouds();
 811                 thesky->drawLowerClouds();
 812                 glDepthMask( GL_TRUE );
 813                 glDisable( GL_STENCIL_TEST );
 814             } else {
 815                 glDepthMask( GL_FALSE );
 816                 thesky->drawLowerClouds();
 817                 glDepthMask( GL_TRUE );
 818             }
 819         }
 820
 821         if ( draw_otw ) {
 822             FGTileMgr::set_tile_filter( false );
 823             sgSetModelFilter( false );
 824             globals->get_aircraft_model()->select( true );
 825             globals->get_model_mgr()->draw();
 826             globals->get_aircraft_model()->draw();
 827             // If the view is internal, the previous line draw the
 828             //  cockpit with modified near/far clip planes and deselect
 829             //  the aircraft in the global scenegraph
 830             // Otherwise, it just enables the aircraft: The scenegraph
 831             //  must be drawn again to see the plane.
 832             ssgCullAndDraw( globals->get_scenery()->get_scene_graph() );
 833             FGTileMgr::set_tile_filter( true );
 834             sgSetModelFilter( true );
 835             globals->get_aircraft_model()->select( true );
 836         }
 837
 838         // display HUD && Panel
 839         glDisable( GL_FOG );
 840         glDisable( GL_DEPTH_TEST );
 841         // glDisable( GL_CULL_FACE );
 842         // glDisable( GL_TEXTURE_2D );
 843
 844         // update the controls subsystem
 845         globals->get_controls()->update(delta_time_sec);
 846
 847         hud_and_panel->apply();
 848         fgCockpitUpdate();
 849
 850         // Use the hud_and_panel ssgSimpleState for rendering the ATC output
 851         // This only works properly if called before the panel call
 852         if((fgGetBool("/sim/ATC/enabled")) || (fgGetBool("/sim/ai-traffic/enabled")))
 853             globals->get_ATC_display()->update(delta_time_sec);
 854
 855         // update the panel subsystem
 856         if ( globals->get_current_panel() != NULL ) {
 857             globals->get_current_panel()->update(delta_time_sec);
 858         }
 859         fgUpdate3DPanels();
 860
 861         // We can do translucent menus, so why not. :-)
 862         menus->apply();
 863         glBlendFunc ( GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA ) ;
 864         puDisplay();
 865         // glDisable ( GL_BLEND ) ;
 866
 867         glEnable( GL_DEPTH_TEST );
 868         glEnable( GL_FOG );
 869
 870         // Fade out the splash screen over the first three seconds.
 871         double t = globals->get_sim_time_sec();
 872         if ( t <= 1.0 ) {
 873             fgSplashUpdate(0.0, 1.0);
 874         } else if ( t <= 3.0) {
 875             fgSplashUpdate(0.0, (3.0 - t) / 2.0);
 876         }
 877     }
 878 }
 879
 880
 881
 882 // options.cxx needs to see this for toggle_panel()
 883 // Handle new window size or exposure
 884 void
 885 FGRenderer::resize( int width, int height ) {
 886     int view_h;
 887
 888     if ( (!fgGetBool("/sim/virtual-cockpit"))
 889          && fgPanelVisible() && idle_state == 1000 ) {
 890         view_h = (int)(height * (globals->get_current_panel()->getViewHeight() -
 891                              globals->get_current_panel()->getYOffset()) / 768.0);
 892     } else {
 893         view_h = height;
 894     }
 895
 896     glViewport( 0, (GLint)(height - view_h), (GLint)(width), (GLint)(view_h) );
 897
 898     fgSetInt("/sim/startup/xsize", width);
 899     fgSetInt("/sim/startup/ysize", height);
 900     guiInitMouse(width, height);
 901
 902     // for all views
 903     FGViewMgr *viewmgr = globals->get_viewmgr();
 904     if (viewmgr) {
 905       for ( int i = 0; i < viewmgr->size(); ++i ) {
 906         viewmgr->get_view(i)->
 907           set_aspect_ratio((float)view_h / (float)width);
 908       }
 909
 910       ssgSetFOV( viewmgr->get_current_view()->get_h_fov(),
 911                viewmgr->get_current_view()->get_v_fov() );
 912
 913 #ifdef FG_USE_CLOUDS_3D
 914       sgClouds3d->Resize( viewmgr->get_current_view()->get_h_fov(),
 915                viewmgr->get_current_view()->get_v_fov() );
 916 #endif
 917     }
 918
 919     fgHUDReshape();
 920
 921 }
 922
 923
 924 // end of renderer.cxx