simgear/environment/visual_enviro.cxx

   1 // Visual environment helper class
   2 //
   3 // Written by Harald JOHNSEN, started April 2005.
   4 //
   5 // Copyright (C) 2005  Harald JOHNSEN - hjohnsen@evc.net
   6 //
   7 // This program is free software; you can redistribute it and/or
   8 // modify it under the terms of the GNU General Public License as
   9 // published by the Free Software Foundation; either version 2 of the
  10 // License, or (at your option) any later version.
  11 //
  12 // This program is distributed in the hope that it will be useful, but
  13 // WITHOUT ANY WARRANTY; without even the implied warranty of
  14 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15 // General Public License for more details.
  16 //
  17 // You should have received a copy of the GNU General Public License
  18 // along with this program; if not, write to the Free Software
  19 // Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
  20 //
  21 //
  22 #ifdef HAVE_CONFIG_H
  23 #  include <simgear_config.h>
  24 #endif
  25
  26 #include <simgear/constants.h>
  27 #include <simgear/structure/SGReferenced.hxx>
  28 #include <simgear/structure/SGSharedPtr.hxx>
  29 #include <simgear/math/sg_random.h>
  30 #include <simgear/math/sg_geodesy.hxx>
  31 #include <simgear/math/point3d.hxx>
  32 #include <simgear/math/polar3d.hxx>
  33 #include <simgear/sound/soundmgr_openal.hxx>
  34 #include <simgear/scene/sky/cloudfield.hxx>
  35 #include <simgear/scene/sky/newcloud.hxx>
  36 #include <simgear/props/props.hxx>
  37 #include "visual_enviro.hxx"
  38
  39 #include <vector>
  40
  41 SG_USING_STD(vector);
  42
  43
  44 typedef struct {
  45         Point3D         pt;
  46         int                     depth;
  47         int                     prev;
  48 } lt_tree_seg;
  49
  50 #define MAX_RAIN_SLICE  200
  51 static float rainpos[MAX_RAIN_SLICE];
  52 #define MAX_LT_TREE_SEG 400
  53
  54 #define DFL_MIN_LIGHT 0.35
  55 sgVec3 SGEnviro::min_light = {DFL_MIN_LIGHT, DFL_MIN_LIGHT, DFL_MIN_LIGHT};
  56 #define DFL_STREAK_BRIGHT_NEARMOST_LAYER 0.9
  57 SGfloat SGEnviro::streak_bright_nearmost_layer = DFL_STREAK_BRIGHT_NEARMOST_LAYER;
  58 #define DFL_STREAK_BRIGHT_FARMOST_LAYER 0.5
  59 SGfloat SGEnviro::streak_bright_farmost_layer = DFL_STREAK_BRIGHT_FARMOST_LAYER;
  60 #define DFL_STREAK_PERIOD_MAX 2.5
  61 SGfloat SGEnviro::streak_period_max = DFL_STREAK_PERIOD_MAX;
  62 #define DFL_STREAK_PERIOD_CHANGE_PER_KT 0.005
  63 SGfloat SGEnviro::streak_period_change_per_kt = DFL_STREAK_PERIOD_CHANGE_PER_KT;
  64 #define DFL_STREAK_PERIOD_MIN 1.0
  65 SGfloat SGEnviro::streak_period_min = DFL_STREAK_PERIOD_MIN;
  66 #define DFL_STREAK_LENGTH_MIN 0.03
  67 SGfloat SGEnviro::streak_length_min = DFL_STREAK_LENGTH_MIN;
  68 #define DFL_STREAK_LENGTH_CHANGE_PER_KT 0.0005
  69 SGfloat SGEnviro::streak_length_change_per_kt = DFL_STREAK_LENGTH_CHANGE_PER_KT;
  70 #define DFL_STREAK_LENGTH_MAX 0.1
  71 SGfloat SGEnviro::streak_length_max = DFL_STREAK_LENGTH_MAX;
  72 #define DFL_STREAK_COUNT_MIN 40
  73 int SGEnviro::streak_count_min = DFL_STREAK_COUNT_MIN;
  74 #define DFL_STREAK_COUNT_MAX 190
  75 #if (DFL_STREAK_COUNT_MAX > MAX_RAIN_SLICE)
  76 #error "Bad default!"
  77 #endif
  78 int SGEnviro::streak_count_max = DFL_STREAK_COUNT_MAX;
  79 #define DFL_CONE_BASE_RADIUS 15.0
  80 SGfloat SGEnviro::cone_base_radius = DFL_CONE_BASE_RADIUS;
  81 #define DFL_CONE_HEIGHT 30.0
  82 SGfloat SGEnviro::cone_height = DFL_CONE_HEIGHT;
  83
  84
  85 void SGEnviro::config(const SGPropertyNode* n)
  86 {
  87         if (!n)
  88                 return;
  89
  90         const float ml = n->getFloatValue("min-light", DFL_MIN_LIGHT);
  91         sgSetVec3(min_light, ml, ml, ml);
  92
  93         streak_bright_nearmost_layer = n->getFloatValue(
  94                         "streak-brightness-nearmost-layer",
  95                         DFL_STREAK_BRIGHT_NEARMOST_LAYER);
  96         streak_bright_farmost_layer = n->getFloatValue(
  97                         "streak-brightness-farmost-layer",
  98                         DFL_STREAK_BRIGHT_FARMOST_LAYER);
  99
 100         streak_period_max = n->getFloatValue(
 101                         "streak-period-max",
 102                         DFL_STREAK_PERIOD_MAX);
 103         streak_period_min = n->getFloatValue(
 104                         "streak-period-min",
 105                         DFL_STREAK_PERIOD_MIN);
 106         streak_period_change_per_kt = n->getFloatValue(
 107                         "streak-period-change-per-kt",
 108                         DFL_STREAK_PERIOD_CHANGE_PER_KT);
 109
 110         streak_length_max = n->getFloatValue(
 111                         "streak-length-max",
 112                         DFL_STREAK_LENGTH_MAX);
 113         streak_length_min = n->getFloatValue(
 114                         "streak-length-min",
 115                         DFL_STREAK_LENGTH_MIN);
 116         streak_length_change_per_kt = n->getFloatValue(
 117                         "streak-length-change-per-kt",
 118                         DFL_STREAK_LENGTH_CHANGE_PER_KT);
 119
 120         streak_count_min = n->getIntValue(
 121                         "streak-count-min", DFL_STREAK_COUNT_MIN);
 122         streak_count_max = n->getIntValue(
 123                         "streak-count-max", DFL_STREAK_COUNT_MAX);
 124         if (streak_count_max > MAX_RAIN_SLICE)
 125                 streak_count_max = MAX_RAIN_SLICE;
 126
 127         cone_base_radius = n->getFloatValue(
 128                         "cone-base-radius", DFL_CONE_BASE_RADIUS);
 129         cone_height = n->getFloatValue("cone_height", DFL_CONE_HEIGHT);
 130 }
 131
 132
 133 /**
 134  * A class to render lightnings.
 135  */
 136 class SGLightning {
 137 public:
 138     /**
 139      * Build a new lightning.
 140      * The lightning has a limited life time. It will also play a thunder sounder once.
 141      * @param lon lon longitude in degree
 142      * @param lat lat latitude in degree
 143      * @param alt asl of top of lightning
 144      */
 145         SGLightning(double lon, double lat, double alt);
 146         ~SGLightning();
 147         void lt_Render(void);
 148         void lt_build(void);
 149         void lt_build_tree_branch(int tree_nr, Point3D &start, float energy, int nbseg, float segsize);
 150
 151         // contains all the segments of the lightning
 152         lt_tree_seg lt_tree[MAX_LT_TREE_SEG];
 153         // segment count
 154         int             nb_tree;
 155         // position of lightning
 156         double  lon, lat, alt;
 157         int             sequence_count;
 158         // time to live
 159         double  age;
 160 };
 161
 162 typedef vector<SGLightning *> list_of_lightning;
 163 static list_of_lightning lightnings;
 164
 165 SGEnviro sgEnviro;
 166
 167 SGEnviro::SGEnviro() :
 168         view_in_cloud(false),
 169         precipitation_enable_state(true),
 170         precipitation_density(100.0),
 171         precipitation_max_alt(0.0),
 172         turbulence_enable_state(false),
 173         last_cloud_turbulence(0.0),
 174         cloud_turbulence(0.0),
 175         lightning_enable_state(false),
 176         elapsed_time(0.0),
 177         dt(0.0),
 178         soundMgr(NULL),
 179         snd_active(false),
 180         snd_dist(0.0),
 181         min_time_before_lt(0.0),
 182         fov_width(55.0),
 183         fov_height(55.0)
 184
 185 {
 186         for(int i = 0; i < MAX_RAIN_SLICE ; i++)
 187                 rainpos[i] = sg_random();
 188         radarEcho.reserve(100);
 189 }
 190
 191 SGEnviro::~SGEnviro(void) {
 192   // OSGFIXME
 193   return;
 194         list_of_lightning::iterator iLightning;
 195         for( iLightning = lightnings.begin() ; iLightning != lightnings.end() ; iLightning++ ) {
 196                 delete (*iLightning);
 197         }
 198         lightnings.clear();
 199 }
 200
 201 void SGEnviro::startOfFrame( sgVec3 p, sgVec3 up, double lon, double lat, double alt, double delta_time) {
 202   // OSGFIXME
 203   return;
 204         view_in_cloud = false;
 205         // ask the impostor cache to do some cleanup
 206         if(SGNewCloud::cldCache)
 207                 SGNewCloud::cldCache->startNewFrame();
 208         last_cloud_turbulence = cloud_turbulence;
 209         cloud_turbulence = 0.0;
 210         elapsed_time += delta_time;
 211         min_time_before_lt -= delta_time;
 212         dt = delta_time;
 213
 214         sgMat4 T1, LON, LAT;
 215     sgVec3 axis;
 216
 217     sgMakeTransMat4( T1, p );
 218
 219     sgSetVec3( axis, 0.0, 0.0, 1.0 );
 220     sgMakeRotMat4( LON, lon, axis );
 221
 222     sgSetVec3( axis, 0.0, 1.0, 0.0 );
 223     sgMakeRotMat4( LAT, 90.0 - lat, axis );
 224
 225     sgMat4 TRANSFORM;
 226
 227     sgCopyMat4( TRANSFORM, T1 );
 228     sgPreMultMat4( TRANSFORM, LON );
 229     sgPreMultMat4( TRANSFORM, LAT );
 230
 231     sgCoord pos;
 232     sgSetCoord( &pos, TRANSFORM );
 233
 234         sgMakeCoordMat4( transform, &pos );
 235     last_lon = lon;
 236     last_lat = lat;
 237         last_alt = alt;
 238
 239         radarEcho.clear();
 240         precipitation_max_alt = 400.0;
 241 }
 242
 243 void SGEnviro::endOfFrame(void) {
 244 }
 245
 246 double SGEnviro::get_cloud_turbulence(void) const {
 247         return last_cloud_turbulence;
 248 }
 249
 250 // this can be queried to add some turbulence for example
 251 bool SGEnviro::is_view_in_cloud(void) const {
 252         return view_in_cloud;
 253 }
 254 void SGEnviro::set_view_in_cloud(bool incloud) {
 255         view_in_cloud = incloud;
 256 }
 257
 258 int SGEnviro::get_CacheResolution(void) const {
 259         return SGCloudField::get_CacheResolution();
 260 }
 261
 262 int SGEnviro::get_clouds_CacheSize(void) const {
 263         return SGCloudField::get_CacheSize();
 264 }
 265 float SGEnviro::get_clouds_visibility(void) const {
 266         return SGCloudField::get_CloudVis();
 267 }
 268 float SGEnviro::get_clouds_density(void) const {
 269         return SGCloudField::get_density();
 270 }
 271 bool SGEnviro::get_clouds_enable_state(void) const {
 272         return SGCloudField::get_enable3dClouds();
 273 }
 274
 275 bool SGEnviro::get_turbulence_enable_state(void) const {
 276         return turbulence_enable_state;
 277 }
 278
 279 void SGEnviro::set_CacheResolution(int resolutionPixels) {
 280         SGCloudField::set_CacheResolution(resolutionPixels);
 281 }
 282
 283 void SGEnviro::set_clouds_CacheSize(int sizeKb) {
 284         SGCloudField::set_CacheSize(sizeKb);
 285 }
 286 void SGEnviro::set_clouds_visibility(float distance) {
 287         SGCloudField::set_CloudVis(distance);
 288 }
 289 void SGEnviro::set_clouds_density(float density) {
 290         SGCloudField::set_density(density);
 291 }
 292 void SGEnviro::set_clouds_enable_state(bool enable) {
 293         SGCloudField::set_enable3dClouds(enable);
 294 }
 295 void SGEnviro::set_turbulence_enable_state(bool enable) {
 296         turbulence_enable_state = enable;
 297 }
 298 // rain/snow
 299 float SGEnviro::get_precipitation_density(void) const {
 300         return precipitation_density;
 301 }
 302 bool SGEnviro::get_precipitation_enable_state(void) const {
 303         return precipitation_enable_state;
 304 }
 305
 306 void SGEnviro::set_precipitation_density(float density) {
 307         precipitation_density = density;
 308 }
 309 void SGEnviro::set_precipitation_enable_state(bool enable) {
 310         precipitation_enable_state = enable;
 311 }
 312
 313 // others
 314 bool SGEnviro::get_lightning_enable_state(void) const {
 315         return lightning_enable_state;
 316 }
 317
 318 void SGEnviro::set_lightning_enable_state(bool enable) {
 319         lightning_enable_state = enable;
 320         if( ! enable ) {
 321                 // TODO:cleanup
 322         }
 323 }
 324
 325 void SGEnviro::setLight(sgVec4 adj_fog_color) {
 326   // OSGFIXME
 327   return;
 328         sgCopyVec4( fog_color, adj_fog_color );
 329         if( false ) {
 330         //    ssgGetLight( 0 ) -> setColour( GL_DIFFUSE, l->scene_diffuse() );
 331         }
 332 }
 333
 334 void SGEnviro::callback_cloud(float heading, float alt, float radius, int family, float dist, int cloudId) {
 335         // send data to wx radar
 336         // compute turbulence
 337         // draw precipitation
 338         // draw lightning
 339         // compute illumination
 340
 341         // http://www.pilotfriend.com/flight_training/weather/THUNDERSTORM%20HAZARDS1.htm
 342         double turbulence = 0.0;
 343         if( dist < radius * radius * 2.25f ) {
 344                 switch(family) {
 345                         case SGNewCloud::CLFamilly_st:
 346                                 turbulence = 0.2;
 347                                 break;
 348                         case SGNewCloud::CLFamilly_ci:
 349                         case SGNewCloud::CLFamilly_cs:
 350                         case SGNewCloud::CLFamilly_cc:
 351                         case SGNewCloud::CLFamilly_ac:
 352                         case SGNewCloud::CLFamilly_as:
 353                                 turbulence = 0.1;
 354                                 break;
 355                         case SGNewCloud::CLFamilly_sc:
 356                                 turbulence = 0.3;
 357                                 break;
 358                         case SGNewCloud::CLFamilly_ns:
 359                                 turbulence = 0.4;
 360                                 break;
 361                         case SGNewCloud::CLFamilly_cu:
 362                                 turbulence = 0.5;
 363                                 break;
 364                         case SGNewCloud::CLFamilly_cb:
 365                                 turbulence = 0.6;
 366                                 break;
 367                 }
 368                 // full turbulence inside cloud, half in the vicinity
 369                 if( dist > radius * radius )
 370                         turbulence *= 0.5;
 371                 if( turbulence > cloud_turbulence )
 372                         cloud_turbulence = turbulence;
 373                 // we can do 'local' precipitations too
 374         }
 375
 376         // convert to LWC for radar (experimental)
 377         // http://www-das.uwyo.edu/~geerts/cwx/notes/chap08/moist_cloud.html
 378         double LWC = 0.0;
 379         switch(family) {
 380                 case SGNewCloud::CLFamilly_st:
 381                         LWC = 0.29;
 382                         break;
 383                 case SGNewCloud::CLFamilly_cu:
 384                         LWC = 0.27;
 385                         break;
 386                 case SGNewCloud::CLFamilly_cb:
 387                         LWC = 2.0;
 388                         break;
 389                 case SGNewCloud::CLFamilly_sc:
 390                         LWC = 0.44;
 391                         break;
 392                 case SGNewCloud::CLFamilly_ci:
 393                         LWC = 0.03;
 394                         break;
 395                 // no data
 396                 case SGNewCloud::CLFamilly_cs:
 397                 case SGNewCloud::CLFamilly_cc:
 398                 case SGNewCloud::CLFamilly_ac:
 399                 case SGNewCloud::CLFamilly_as:
 400                         LWC = 0.03;
 401                         break;
 402                 case SGNewCloud::CLFamilly_ns:
 403                         LWC = 0.29*2.0;
 404                         break;
 405         }
 406
 407         // add to the list for the wxRadar instrument
 408         if( LWC > 0.0 )
 409                 radarEcho.push_back( SGWxRadarEcho ( heading, alt, radius, dist, LWC, false, cloudId ) );
 410
 411         // NB:data valid only from cockpit view
 412
 413         // spawn a new lightning
 414         if(lightning_enable_state && min_time_before_lt <= 0.0 && (family == SGNewCloud::CLFamilly_cb) &&
 415                 dist < 15000.0 * 15000.0 && sg_random() > 0.9f) {
 416                 double lat, lon;
 417                 Point3D orig, dest;
 418                 orig.setlat(last_lat * SG_DEGREES_TO_RADIANS );
 419                 orig.setlon(last_lon * SG_DEGREES_TO_RADIANS );
 420                 orig.setelev(0.0);
 421                 dist = sgSqrt(dist);
 422                 dest = calc_gc_lon_lat(orig, heading, dist);
 423                 lon = dest.lon() * SG_RADIANS_TO_DEGREES;
 424                 lat = dest.lat() * SG_RADIANS_TO_DEGREES;
 425                 addLightning( lon, lat, alt );
 426
 427                 // reset timer
 428                 min_time_before_lt = 5.0 + sg_random() * 30;
 429                 // DEBUG only
 430 //              min_time_before_lt = 5.0;
 431         }
 432         if( (alt - radius * 0.1) > precipitation_max_alt )
 433                 switch(family) {
 434                         case SGNewCloud::CLFamilly_st:
 435                         case SGNewCloud::CLFamilly_cu:
 436                         case SGNewCloud::CLFamilly_cb:
 437                         case SGNewCloud::CLFamilly_ns:
 438                         case SGNewCloud::CLFamilly_sc:
 439                                 precipitation_max_alt = alt - radius * 0.1;
 440                                 break;
 441                 }
 442 }
 443
 444 list_of_SGWxRadarEcho *SGEnviro::get_radar_echo(void) {
 445         return &radarEcho;
 446 }
 447
 448 // precipitation rendering code
 449 void SGEnviro::DrawCone2(float baseRadius, float height, int slices, bool down, double rain_norm, double speed) {
 450   // OSGFIXME
 451   return;
 452         sgVec3 light;
 453         sgAddVec3( light, fog_color, min_light );
 454         float da = SG_PI * 2.0f / (float) slices;
 455         // low number = faster
 456         float speedf = streak_period_max - speed * streak_period_change_per_kt;
 457         if( speedf < streak_period_min )
 458                 speedf = streak_period_min;
 459         float lenf = streak_length_min + speed * streak_length_change_per_kt;
 460         if( lenf > streak_length_max )
 461                 lenf = streak_length_max;
 462     float t = fmod((float) elapsed_time, speedf) / speedf;
 463 //      t = 0.1f;
 464         if( !down )
 465                 t = 1.0f - t;
 466         float angle = 0.0f;
 467         //glColor4f(1.0f, 0.7f, 0.7f, 0.9f); // XXX unneeded? overriden below
 468         glBegin(GL_LINES);
 469         if (slices >  MAX_RAIN_SLICE)
 470                 slices = MAX_RAIN_SLICE; // should never happen
 471         for( int i = 0 ; i < slices ; i++ ) {
 472                 float x = cos(angle) * baseRadius;
 473                 float y = sin(angle) * baseRadius;
 474                 angle += da;
 475                 sgVec3 dir = {x, -height, y};
 476
 477                 // rain drops at 2 different speed to simulate depth
 478                 float t1 = (i & 1 ? t : t + t) + rainpos[i];
 479                 if(t1 > 1.0f)   t1 -= 1.0f;
 480                 if(t1 > 1.0f)   t1 -= 1.0f;
 481
 482                 // distant raindrops are more transparent
 483                 float c = t1 * (i & 1 ?
 484                                 streak_bright_farmost_layer
 485                                 : streak_bright_nearmost_layer);
 486                 glColor4f(c * light[0], c * light[1], c * light[2], c);
 487                 sgVec3 p1, p2;
 488                 sgScaleVec3(p1, dir, t1);
 489                 // distant raindrops are shorter
 490                 float t2 = t1 + (i & 1 ? lenf : lenf+lenf);
 491                 sgScaleVec3(p2, dir, t2);
 492
 493                 glVertex3f(p1[0], p1[1] + height, p1[2]);
 494                 glVertex3f(p2[0], p2[1] + height, p2[2]);
 495         }
 496         glEnd();
 497 }
 498
 499 void SGEnviro::drawRain(double pitch, double roll, double heading, double hspeed, double rain_norm) {
 500   // OSGFIXME
 501   return;
 502
 503 #if 0
 504         static int debug_period = 0;
 505         if (debug_period++ == 50) {
 506                 debug_period = 0;
 507                 cout << "drawRain("
 508                         << pitch << ", "
 509                         << roll  << ", "
 510                         << heading << ", "
 511                         << hspeed << ", "
 512                         << rain_norm << ");"
 513                         //" angle = " << angle
 514                         //<< " raindrop(KTS) = " << raindrop_speed_kts
 515                         << endl;
 516         }
 517 #endif
 518
 519
 520         glBindTexture(GL_TEXTURE_2D, 0);
 521
 522         glDisable(GL_DEPTH_TEST);
 523         glShadeModel(GL_SMOOTH);
 524         glEnable(GL_BLEND);
 525         glBlendFunc( GL_ONE, GL_ONE_MINUS_SRC_ALPHA );
 526         glDisable( GL_FOG );
 527         glDisable(GL_LIGHTING);
 528
 529         int slice_count = static_cast<int>(
 530                         (streak_count_min + rain_norm*(streak_count_max-streak_count_min))
 531                                 * precipitation_density / 100.0);
 532
 533         // www.wonderquest.com/falling-raindrops.htm says that
 534         // Raindrop terminal velocity is 5 to 20mph
 535         // Rather than model it accurately (temp, pressure, diameter), and make it
 536         // smaller than terminal when closer to the precipitation cloud base,
 537         // we interpolate in the 5-20mph range according to rain_norm.
 538         double raindrop_speed_kts
 539                 = (5.0 + rain_norm*15.0) * SG_MPH_TO_MPS * SG_MPS_TO_KT;
 540
 541         float angle = atanf(hspeed / raindrop_speed_kts) * SG_RADIANS_TO_DEGREES;
 542         glPushMatrix();
 543                 // the cone rotate with hspeed
 544                 angle = -pitch - angle;
 545                 glRotatef(roll, 0.0, 0.0, 1.0);
 546                 glRotatef(heading, 0.0, 1.0, 0.0);
 547                 glRotatef(angle, 1.0, 0.0, 0.0);
 548
 549                 // up cone
 550                 DrawCone2(cone_base_radius, cone_height,
 551                                 slice_count, true, rain_norm, hspeed);
 552                 // down cone (usually not visible)
 553                 if(angle > 0.0 || heading != 0.0)
 554                         DrawCone2(cone_base_radius, -cone_height,
 555                                         slice_count, false, rain_norm, hspeed);
 556
 557         glPopMatrix();
 558
 559         glEnable(GL_LIGHTING);
 560         glBlendFunc ( GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA ) ;
 561         glEnable( GL_FOG );
 562         glEnable(GL_DEPTH_TEST);
 563
 564 }
 565
 566 void SGEnviro::set_soundMgr(SGSoundMgr *mgr) {
 567         soundMgr = mgr;
 568 }
 569
 570 void SGEnviro::drawPrecipitation(double rain_norm, double snow_norm, double hail_norm, double pitch, double roll, double heading, double hspeed) {
 571   // OSGFIXME
 572   return;
 573         if( precipitation_enable_state && rain_norm > 0.0)
 574           if( precipitation_max_alt >= last_alt )
 575                 drawRain(pitch, roll, heading, hspeed, rain_norm);
 576 }
 577
 578
 579 SGLightning::SGLightning(double _lon, double _lat, double _alt) :
 580         nb_tree(0),
 581         lon(_lon),
 582         lat(_lat),
 583         alt(_alt),
 584         age(1.0 + sg_random() * 4.0)
 585 {
 586 //      sequence_count = 1 + sg_random() * 5.0;
 587         lt_build();
 588 }
 589
 590 SGLightning::~SGLightning() {
 591 }
 592
 593 // lightning rendering code
 594 void SGLightning::lt_build_tree_branch(int tree_nr, Point3D &start, float energy, int nbseg, float segsize) {
 595   // OSGFIXME
 596   return;
 597
 598         sgVec3 dir, newdir;
 599         int nseg = 0;
 600         Point3D pt = start;
 601         if( nbseg == 50 )
 602                 sgSetVec3( dir, 0.0, -1.0, 0.0 );
 603         else {
 604                 sgSetVec3( dir, sg_random() - 0.5f, sg_random() - 0.5f, sg_random() - 0.5f);
 605                 sgNormaliseVec3(dir);
 606         }
 607         if( nb_tree >= MAX_LT_TREE_SEG )
 608                 return;
 609
 610         lt_tree[nb_tree].depth = tree_nr;
 611         nseg = 0;
 612         lt_tree[nb_tree].pt = pt;
 613         lt_tree[nb_tree].prev = -1;
 614         nb_tree ++;
 615
 616         // TODO:check agl
 617         while(nseg < nbseg && pt.y() > 0.0) {
 618         int prev = nb_tree - 1;
 619         nseg++;
 620                 // add a branch
 621         if( energy * sg_random() > 0.8f )
 622                         lt_build_tree_branch(tree_nr + 1, pt, energy * 0.9f, nbseg == 50 ? 10 : static_cast<int>(nbseg * 0.4f), segsize * 0.7f);
 623
 624                 if( nb_tree >= MAX_LT_TREE_SEG )
 625                         return;
 626                 sgSetVec3(newdir, (sg_random() - 0.5f), (sg_random() - 0.5f) - (nbseg == 50 ? 0.5f : 0.0), (sg_random() - 0.5f));
 627                 sgNormaliseVec3(newdir);
 628                 sgAddVec3( dir, newdir);
 629                 sgNormaliseVec3(dir);
 630                 sgVec3 scaleDir;
 631                 sgScaleVec3( scaleDir, dir, segsize * energy * 0.5f );
 632                 pt[PX] += scaleDir[0];
 633                 pt[PY] += scaleDir[1];
 634                 pt[PZ] += scaleDir[2];
 635
 636                 lt_tree[nb_tree].depth = tree_nr;
 637                 lt_tree[nb_tree].pt = pt;
 638                 lt_tree[nb_tree].prev = prev;
 639                 nb_tree ++;
 640         }
 641 }
 642
 643 void SGLightning::lt_build(void) {
 644   // OSGFIXME
 645   return;
 646     Point3D top;
 647     nb_tree = 0;
 648     top[PX] = 0 ;
 649     top[PY] = alt;
 650     top[PZ] = 0;
 651     lt_build_tree_branch(0, top, 1.0, 50, top[PY] / 8.0);
 652         if( ! sgEnviro.soundMgr )
 653                 return;
 654         Point3D start( sgEnviro.last_lon*SG_DEGREES_TO_RADIANS, sgEnviro.last_lat*SG_DEGREES_TO_RADIANS, 0.0 );
 655         Point3D dest( lon*SG_DEGREES_TO_RADIANS, lat*SG_DEGREES_TO_RADIANS, 0.0 );
 656         double course = 0.0, dist = 0.0;
 657         calc_gc_course_dist( dest, start, &course, &dist );
 658         if( dist < 10000.0 && ! sgEnviro.snd_playing && (dist < sgEnviro.snd_dist || ! sgEnviro.snd_active) ) {
 659                 sgEnviro.snd_timer = 0.0;
 660                 sgEnviro.snd_wait  = dist / 340;
 661                 sgEnviro.snd_dist  = dist;
 662                 sgEnviro.snd_pos_lat = lat;
 663                 sgEnviro.snd_pos_lon = lon;
 664                 sgEnviro.snd_active = true;
 665                 sgEnviro.snd_playing = false;
 666         }
 667 }
 668
 669
 670 void SGLightning::lt_Render(void) {
 671   // OSGFIXME
 672   return;
 673         float flash = 0.5;
 674         if( fmod(sgEnviro.elapsed_time*100.0, 100.0) > 50.0 )
 675                 flash = sg_random() * 0.75f + 0.25f;
 676     float h = lt_tree[0].pt[PY];
 677         sgVec4 col={0.62f, 0.83f, 1.0f, 1.0f};
 678         sgVec4 c;
 679
 680 #define DRAW_SEG() \
 681                         {glColorMaterial(GL_FRONT, GL_EMISSION);  \
 682                         glDisable(GL_LINE_SMOOTH); glBegin(GL_LINES); \
 683                                 glColor4fv(c); \
 684                 glVertex3f(lt_tree[n].pt[PX], lt_tree[n].pt[PZ], lt_tree[n].pt[PY]); \
 685                 glVertex3f(lt_tree[lt_tree[n].prev].pt[PX], lt_tree[lt_tree[n].prev].pt[PZ], lt_tree[lt_tree[n].prev].pt[PY]); \
 686                         glEnd(); glEnable(GL_LINE_SMOOTH);}
 687
 688         glDepthMask( GL_FALSE );
 689         glEnable(GL_BLEND);
 690         glBlendFunc( GL_DST_ALPHA, GL_ONE_MINUS_SRC_ALPHA );
 691         glBindTexture(GL_TEXTURE_2D, 0);
 692
 693         glDisable(GL_LIGHTING);
 694         glDisable( GL_FOG );
 695         glPushMatrix();
 696         sgMat4 modelview, tmp;
 697     // OSGFIXME
 698 //     ssgGetModelviewMatrix( modelview );
 699         sgCopyMat4( tmp, sgEnviro.transform );
 700     sgPostMultMat4( tmp, modelview );
 701     // OSGFIXME
 702 //     ssgLoadModelviewMatrix( tmp );
 703
 704     Point3D start( sgEnviro.last_lon*SG_DEGREES_TO_RADIANS, sgEnviro.last_lat*SG_DEGREES_TO_RADIANS, 0.0 );
 705     Point3D dest( lon*SG_DEGREES_TO_RADIANS, lat*SG_DEGREES_TO_RADIANS, 0.0 );
 706     double course = 0.0, dist = 0.0;
 707     calc_gc_course_dist( dest, start, &course, &dist );
 708     double ax = 0.0, ay = 0.0;
 709     ax = cos(course) * dist;
 710     ay = sin(course) * dist;
 711
 712         glTranslatef( ax, ay, -sgEnviro.last_alt );
 713
 714         sgEnviro.radarEcho.push_back( SGWxRadarEcho ( course, 0.0, 0.0, dist, age, true, 0 ) );
 715
 716         for( int n = 0 ; n < nb_tree ; n++ ) {
 717         if( lt_tree[n].prev < 0 )
 718                         continue;
 719
 720         float t1 = sgLerp(0.5, 1.0, lt_tree[n].pt[PY] / h);
 721                 t1 *= flash;
 722                 if( lt_tree[n].depth >= 2 ) {
 723             glLineWidth(3);
 724                         sgScaleVec4(c, col, t1 * 0.6f);
 725                         DRAW_SEG();
 726                 } else {
 727                         if( lt_tree[n].depth == 0 ) {
 728                 glLineWidth(12);
 729                                 sgScaleVec4(c, col, t1 * 0.5f);
 730                                 DRAW_SEG();
 731
 732                 glLineWidth(6);
 733                                 sgScaleVec4(c, col, t1);
 734                                 DRAW_SEG();
 735                         } else {
 736                 glLineWidth(6);
 737                                 sgScaleVec4(c, col, t1 * 0.7f);
 738                                 DRAW_SEG();
 739                         }
 740
 741             if( lt_tree[n].depth == 0 )
 742                 glLineWidth(3);
 743                         else
 744                 glLineWidth(2);
 745
 746             sgSetVec4(c, t1, t1, t1, t1);
 747                         DRAW_SEG();
 748                 }
 749
 750         }
 751     glLineWidth(1);
 752         glBlendFunc ( GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA ) ;
 753         glPopMatrix();
 754         glDepthMask( GL_TRUE );
 755         glEnable( GL_FOG );
 756         glEnable(GL_LIGHTING);
 757 }
 758
 759 void SGEnviro::addLightning(double lon, double lat, double alt) {
 760   // OSGFIXME
 761   return;
 762         if( lightnings.size() > 10)
 763                 return;
 764         SGLightning *lt= new SGLightning(lon, lat, alt);
 765         lightnings.push_back(lt);
 766 }
 767
 768 void SGEnviro::drawLightning(void) {
 769   // OSGFIXME
 770   return;
 771         list_of_lightning::iterator iLightning;
 772         // play 'thunder' for lightning
 773         if( snd_active )
 774                 if( !snd_playing ) {
 775                         // wait until sound has reached us
 776                         snd_timer += dt;
 777                         if( snd_timer >= snd_wait ) {
 778                                 snd_playing = true;
 779                                 // compute relative position of lightning
 780                                 Point3D start( sgEnviro.last_lon*SG_DEGREES_TO_RADIANS, sgEnviro.last_lat*SG_DEGREES_TO_RADIANS, 0.0 );
 781                                 Point3D dest( snd_pos_lon*SG_DEGREES_TO_RADIANS, snd_pos_lat*SG_DEGREES_TO_RADIANS, 0.0 );
 782                                 double course = 0.0, dist = 0.0;
 783                                 calc_gc_course_dist( dest, start, &course, &dist );
 784                                 double ax = 0.0, ay = 0.0;
 785                                 ax = cos(course) * dist;
 786                                 ay = sin(course) * dist;
 787                                 SGSharedPtr<SGSoundSample> snd = soundMgr->find("thunder");
 788                                 if( snd ) {
 789                                         ALfloat pos[3]={ax, ay, -sgEnviro.last_alt };
 790                                         snd->set_source_pos(pos);
 791                                         snd->play_once();
 792                                 }
 793                         }
 794                 } else {
 795                         if( !soundMgr->is_playing("thunder") ) {
 796                                 snd_active = false;
 797                                 snd_playing = false;
 798                         }
 799                 }
 800
 801         if( ! lightning_enable_state )
 802                 return;
 803
 804         for( iLightning = lightnings.begin() ; iLightning != lightnings.end() ; iLightning++ ) {
 805                 if( dt )
 806                         if( sg_random() > 0.95f )
 807                                 (*iLightning)->lt_build();
 808                 (*iLightning)->lt_Render();
 809                 (*iLightning)->age -= dt;
 810                 if( (*iLightning)->age < 0.0 ) {
 811                         delete (*iLightning);
 812                         lightnings.erase( iLightning );
 813                         break;
 814                 }
 815         }
 816
 817 }
 818
 819
 820 void SGEnviro::setFOV( float w, float h ) {
 821         fov_width = w;
 822         fov_height = h;
 823 }
 824
 825 void SGEnviro::getFOV( float &w, float &h ) {
 826         w = fov_width;
 827         h = fov_height;
 828 }