simgear/scene/sky/cloud.cxx

   1 // cloud.cxx -- model a single cloud layer
   2 //
   3 // Written by Curtis Olson, started June 2000.
   4 //
   5 // Copyright (C) 2000  Curtis L. Olson  - http://www.flightgear.org/~curt
   6 //
   7 // This library is free software; you can redistribute it and/or
   8 // modify it under the terms of the GNU Library General Public
   9 // License as published by the Free Software Foundation; either
  10 // version 2 of the License, or (at your option) any later version.
  11 //
  12 // This library 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 // $Id$
  22
  23 #ifdef HAVE_CONFIG_H
  24 #  include <simgear_config.h>
  25 #endif
  26
  27 #include <simgear/compiler.h>
  28
  29 #include <sstream>
  30
  31 #include <math.h>
  32
  33 #include <osg/AlphaFunc>
  34 #include <osg/BlendFunc>
  35 #include <osg/Geode>
  36 #include <osg/Geometry>
  37 #include <osg/Material>
  38 #include <osg/ShadeModel>
  39 #include <osg/TexEnv>
  40 #include <osg/TexEnvCombine>
  41 #include <osg/Texture2D>
  42 #include <osg/TextureCubeMap>
  43 #include <osg/TexMat>
  44
  45 #include <simgear/math/sg_random.h>
  46 #include <simgear/misc/PathOptions.hxx>
  47 #include <simgear/debug/logstream.hxx>
  48 #include <simgear/scene/model/model.hxx>
  49 #include <simgear/scene/util/RenderConstants.hxx>
  50 #include <simgear/scene/util/StateAttributeFactory.hxx>
  51 #include <simgear/math/polar3d.hxx>
  52
  53 #include "newcloud.hxx"
  54 #include "cloudfield.hxx"
  55 #include "cloud.hxx"
  56
  57 using namespace simgear;
  58 #if defined(__MINGW32__)
  59 #define isnan(x) _isnan(x)
  60 #endif
  61
  62 // #if defined (__FreeBSD__)
  63 // #  if __FreeBSD_version < 500000
  64 //      extern "C" {
  65 //        inline int isnan(double r) { return !(r <= 0 || r >= 0); }
  66 //      }
  67 // #  endif
  68 // #endif
  69
  70 #if defined (__CYGWIN__)
  71 #include <ieeefp.h>
  72 #endif
  73
  74 static osg::ref_ptr<osg::StateSet> layer_states[SGCloudLayer::SG_MAX_CLOUD_COVERAGES];
  75 static osg::ref_ptr<osg::StateSet> layer_states2[SGCloudLayer::SG_MAX_CLOUD_COVERAGES];
  76 static osg::ref_ptr<osg::TextureCubeMap> cubeMap;
  77 static bool state_initialized = false;
  78 static bool bump_mapping = false;
  79
  80 bool SGCloudLayer::enable_bump_mapping = false;
  81
  82 // make an StateSet for a cloud layer given the named texture
  83 static osg::StateSet*
  84 SGMakeState(const SGPath &path, const char* colorTexture,
  85             const char* normalTexture)
  86 {
  87     osg::StateSet *stateSet = new osg::StateSet;
  88
  89     osg::ref_ptr<osgDB::ReaderWriter::Options> options
  90         = makeOptionsFromPath(path);
  91     stateSet->setTextureAttribute(0, SGLoadTexture2D(colorTexture,
  92                                                      options.get()));
  93     stateSet->setTextureMode(0, GL_TEXTURE_2D, osg::StateAttribute::ON);
  94     StateAttributeFactory* attribFactory = StateAttributeFactory::instance();
  95     stateSet->setAttributeAndModes(attribFactory->getSmoothShadeModel());
  96     stateSet->setMode(GL_LIGHTING, osg::StateAttribute::OFF);
  97     stateSet->setMode(GL_CULL_FACE, osg::StateAttribute::OFF);
  98     stateSet->setAttributeAndModes(attribFactory->getStandardAlphaFunc());
  99     stateSet->setAttributeAndModes(attribFactory->getStandardBlendFunc());
 100
 101 //     osg::Material* material = new osg::Material;
 102 //     material->setColorMode(osg::Material::AMBIENT_AND_DIFFUSE);
 103 //     material->setEmission(osg::Material::FRONT_AND_BACK,
 104 //                           osg::Vec4(0.05, 0.05, 0.05, 0));
 105 //     material->setSpecular(osg::Material::FRONT_AND_BACK,
 106 //                           osg::Vec4(0, 0, 0, 1));
 107 //     stateSet->setAttribute(material);
 108
 109     stateSet->setMode(GL_FOG, osg::StateAttribute::OFF);
 110
 111     // OSGFIXME: invented by me ...
 112 //     stateSet->setMode(GL_DEPTH_TEST, osg::StateAttribute::OFF);
 113 //     stateSet->setMode(GL_LIGHTING, osg::StateAttribute::ON);
 114
 115 //     stateSet->setMode(GL_LIGHT0, osg::StateAttribute::OFF);
 116
 117     // If the normal texture is given prepare a bumpmapping enabled state
 118 //     if (normalTexture) {
 119 //       SGPath normalPath(path);
 120 //       normalPath.append(normalTexture);
 121 //       stateSet->setTextureAttribute(2, SGLoadTexture2D(normalPath));
 122 //       stateSet->setTextureMode(2, GL_TEXTURE_2D, osg::StateAttribute::ON);
 123 //     }
 124
 125     return stateSet;
 126 }
 127
 128 // Constructor
 129 SGCloudLayer::SGCloudLayer( const string &tex_path ) :
 130     layer_root(new osg::Switch),
 131     group_top(new osg::Group),
 132     group_bottom(new osg::Group),
 133     layer_transform(new osg::MatrixTransform),
 134     cloud_alpha(1.0),
 135     texture_path(tex_path),
 136     layer_span(0.0),
 137     layer_asl(0.0),
 138     layer_thickness(0.0),
 139     layer_transition(0.0),
 140     layer_coverage(SG_CLOUD_CLEAR),
 141     scale(4000.0),
 142     speed(0.0),
 143     direction(0.0),
 144     last_lon(0.0),
 145     last_lat(0.0)
 146 {
 147     // XXX
 148     // Render bottoms before the rest of transparent objects (rendered
 149     // in bin 10), tops after. The negative numbers on the bottoms
 150     // RenderBins and the positive numbers on the tops enforce this
 151     // order.
 152   layer_root->addChild(group_bottom.get());
 153   layer_root->addChild(group_top.get());
 154   osg::StateSet *rootSet = layer_root->getOrCreateStateSet();
 155   rootSet->setRenderBinDetails(CLOUDS_BIN, "DepthSortedBin");
 156   rootSet->setTextureAttribute(0, new osg::TexMat);
 157   // Combiner for fog color and cloud alpha
 158   osg::TexEnvCombine* combine0 = new osg::TexEnvCombine;
 159   osg::TexEnvCombine* combine1 = new osg::TexEnvCombine;
 160   combine0->setCombine_RGB(osg::TexEnvCombine::MODULATE);
 161   combine0->setSource0_RGB(osg::TexEnvCombine::PREVIOUS);
 162   combine0->setOperand0_RGB(osg::TexEnvCombine::SRC_COLOR);
 163   combine0->setSource1_RGB(osg::TexEnvCombine::TEXTURE0);
 164   combine0->setOperand1_RGB(osg::TexEnvCombine::SRC_COLOR);
 165   combine0->setCombine_Alpha(osg::TexEnvCombine::MODULATE);
 166   combine0->setSource0_Alpha(osg::TexEnvCombine::PREVIOUS);
 167   combine0->setOperand0_Alpha(osg::TexEnvCombine::SRC_ALPHA);
 168   combine0->setSource1_Alpha(osg::TexEnvCombine::TEXTURE0);
 169   combine0->setOperand1_Alpha(osg::TexEnvCombine::SRC_ALPHA);
 170
 171   combine1->setCombine_RGB(osg::TexEnvCombine::MODULATE);
 172   combine1->setSource0_RGB(osg::TexEnvCombine::PREVIOUS);
 173   combine1->setOperand0_RGB(osg::TexEnvCombine::SRC_COLOR);
 174   combine1->setSource1_RGB(osg::TexEnvCombine::CONSTANT);
 175   combine1->setOperand1_RGB(osg::TexEnvCombine::SRC_COLOR);
 176   combine1->setCombine_Alpha(osg::TexEnvCombine::MODULATE);
 177   combine1->setSource0_Alpha(osg::TexEnvCombine::PREVIOUS);
 178   combine1->setOperand0_Alpha(osg::TexEnvCombine::SRC_ALPHA);
 179   combine1->setSource1_Alpha(osg::TexEnvCombine::CONSTANT);
 180   combine1->setOperand1_Alpha(osg::TexEnvCombine::SRC_ALPHA);
 181   combine1->setDataVariance(osg::Object::DYNAMIC);
 182   rootSet->setTextureAttributeAndModes(0, combine0);
 183   rootSet->setTextureAttributeAndModes(1, combine1);
 184   rootSet->setTextureMode(1, GL_TEXTURE_2D, osg::StateAttribute::ON);
 185   rootSet->setTextureAttributeAndModes(1, StateAttributeFactory::instance()
 186                                        ->getWhiteTexture(),
 187                                        osg::StateAttribute::ON);
 188   rootSet->setDataVariance(osg::Object::DYNAMIC);
 189
 190   base = osg::Vec2(sg_random(), sg_random());
 191
 192   group_top->addChild(layer_transform.get());
 193   group_bottom->addChild(layer_transform.get());
 194
 195   layer3D = new SGCloudField;
 196   rebuild();
 197 }
 198
 199 // Destructor
 200 SGCloudLayer::~SGCloudLayer()
 201 {
 202   delete layer3D;
 203 }
 204
 205 float
 206 SGCloudLayer::getSpan_m () const
 207 {
 208     return layer_span;
 209 }
 210
 211 void
 212 SGCloudLayer::setSpan_m (float span_m)
 213 {
 214     if (span_m != layer_span) {
 215         layer_span = span_m;
 216         rebuild();
 217     }
 218 }
 219
 220 float
 221 SGCloudLayer::getElevation_m () const
 222 {
 223     return layer_asl;
 224 }
 225
 226 void
 227 SGCloudLayer::setElevation_m (float elevation_m, bool set_span)
 228 {
 229     layer_asl = elevation_m;
 230
 231     if (set_span) {
 232         if (elevation_m > 4000)
 233             setSpan_m(  elevation_m * 10 );
 234         else
 235             setSpan_m( 40000 );
 236     }
 237 }
 238
 239 float
 240 SGCloudLayer::getThickness_m () const
 241 {
 242     return layer_thickness;
 243 }
 244
 245 void
 246 SGCloudLayer::setThickness_m (float thickness_m)
 247 {
 248     layer_thickness = thickness_m;
 249 }
 250
 251 float
 252 SGCloudLayer::getTransition_m () const
 253 {
 254     return layer_transition;
 255 }
 256
 257 void
 258 SGCloudLayer::setTransition_m (float transition_m)
 259 {
 260     layer_transition = transition_m;
 261 }
 262
 263 SGCloudLayer::Coverage
 264 SGCloudLayer::getCoverage () const
 265 {
 266     return layer_coverage;
 267 }
 268
 269 void
 270 SGCloudLayer::setCoverage (Coverage coverage)
 271 {
 272     if (coverage != layer_coverage) {
 273         layer_coverage = coverage;
 274         rebuild();
 275     }
 276 }
 277
 278 void
 279 SGCloudLayer::setTextureOffset(const osg::Vec2& offset)
 280 {
 281     osg::StateAttribute* attr = layer_root->getStateSet()
 282         ->getTextureAttribute(0, osg::StateAttribute::TEXMAT);
 283     osg::TexMat* texMat = dynamic_cast<osg::TexMat*>(attr);
 284     if (!texMat)
 285         return;
 286     texMat->setMatrix(osg::Matrix::translate(offset[0], offset[1], 0.0));
 287 }
 288
 289 // build the cloud object
 290 void
 291 SGCloudLayer::rebuild()
 292 {
 293     // Initialize states and sizes if necessary.
 294     if ( !state_initialized ) {
 295         state_initialized = true;
 296
 297         SG_LOG(SG_ASTRO, SG_INFO, "initializing cloud layers");
 298
 299         osg::Texture::Extensions* extensions;
 300         extensions = osg::Texture::getExtensions(0, true);
 301         // OSGFIXME
 302         bump_mapping = extensions->isMultiTexturingSupported() &&
 303           (2 <= extensions->numTextureUnits()) &&
 304           SGIsOpenGLExtensionSupported("GL_ARB_texture_env_combine") &&
 305           SGIsOpenGLExtensionSupported("GL_ARB_texture_env_dot3");
 306
 307         osg::TextureCubeMap::Extensions* extensions2;
 308         extensions2 = osg::TextureCubeMap::getExtensions(0, true);
 309         bump_mapping = bump_mapping && extensions2->isCubeMapSupported();
 310
 311         // This bump mapping code was inspired by the tutorial available at
 312         // http://www.paulsprojects.net/tutorials/simplebump/simplebump.html
 313         // and a NVidia white paper
 314         //  http://developer.nvidia.com/object/bumpmappingwithregistercombiners.html
 315         // The normal map textures were generated by the normal map Gimp plugin :
 316         //  http://nifelheim.dyndns.org/~cocidius/normalmap/
 317         //
 318         cubeMap = new osg::TextureCubeMap;
 319         cubeMap->setFilter(osg::Texture::MIN_FILTER, osg::Texture::LINEAR);
 320         cubeMap->setFilter(osg::Texture::MAG_FILTER, osg::Texture::LINEAR);
 321         cubeMap->setWrap(osg::Texture::WRAP_S, osg::Texture::CLAMP_TO_EDGE);
 322         cubeMap->setWrap(osg::Texture::WRAP_T, osg::Texture::CLAMP_TO_EDGE);
 323         cubeMap->setWrap(osg::Texture::WRAP_R, osg::Texture::CLAMP_TO_EDGE);
 324
 325         const int size = 32;
 326         const float half_size = 16.0f;
 327         const float offset = 0.5f;
 328         osg::Vec3 zero_normal(0.5, 0.5, 0.5);
 329
 330         osg::Image* image = new osg::Image;
 331         image->allocateImage(size, size, 1, GL_RGB, GL_UNSIGNED_BYTE);
 332         unsigned char *ptr = image->data(0, 0);
 333         for (int j = 0; j < size; j++ ) {
 334           for (int i = 0; i < size; i++ ) {
 335             osg::Vec3 tmp(half_size, -( j + offset - half_size ),
 336                           -( i + offset - half_size ) );
 337             tmp.normalize();
 338             tmp = tmp*0.5 - zero_normal;
 339
 340             *ptr++ = (unsigned char)( tmp[ 0 ] * 255 );
 341             *ptr++ = (unsigned char)( tmp[ 1 ] * 255 );
 342             *ptr++ = (unsigned char)( tmp[ 2 ] * 255 );
 343           }
 344         }
 345         cubeMap->setImage(osg::TextureCubeMap::POSITIVE_X, image);
 346
 347         image = new osg::Image;
 348         image->allocateImage(size, size, 1, GL_RGB, GL_UNSIGNED_BYTE);
 349         ptr = image->data(0, 0);
 350         for (int j = 0; j < size; j++ ) {
 351           for (int i = 0; i < size; i++ ) {
 352             osg::Vec3 tmp(-half_size, -( j + offset - half_size ),
 353                           ( i + offset - half_size ) );
 354             tmp.normalize();
 355             tmp = tmp*0.5 - zero_normal;
 356
 357             *ptr++ = (unsigned char)( tmp[ 0 ] * 255 );
 358             *ptr++ = (unsigned char)( tmp[ 1 ] * 255 );
 359             *ptr++ = (unsigned char)( tmp[ 2 ] * 255 );
 360           }
 361         }
 362         cubeMap->setImage(osg::TextureCubeMap::NEGATIVE_X, image);
 363
 364         image = new osg::Image;
 365         image->allocateImage(size, size, 1, GL_RGB, GL_UNSIGNED_BYTE);
 366         ptr = image->data(0, 0);
 367         for (int j = 0; j < size; j++ ) {
 368           for (int i = 0; i < size; i++ ) {
 369             osg::Vec3 tmp(( i + offset - half_size ), half_size,
 370                           ( j + offset - half_size ) );
 371             tmp.normalize();
 372             tmp = tmp*0.5 - zero_normal;
 373
 374             *ptr++ = (unsigned char)( tmp[ 0 ] * 255 );
 375             *ptr++ = (unsigned char)( tmp[ 1 ] * 255 );
 376             *ptr++ = (unsigned char)( tmp[ 2 ] * 255 );
 377           }
 378         }
 379         cubeMap->setImage(osg::TextureCubeMap::POSITIVE_Y, image);
 380
 381         image = new osg::Image;
 382         image->allocateImage(size, size, 1, GL_RGB, GL_UNSIGNED_BYTE);
 383         ptr = image->data(0, 0);
 384         for (int j = 0; j < size; j++ ) {
 385           for (int i = 0; i < size; i++ ) {
 386             osg::Vec3 tmp(( i + offset - half_size ), -half_size,
 387                           -( j + offset - half_size ) );
 388             tmp.normalize();
 389             tmp = tmp*0.5 - zero_normal;
 390
 391             *ptr++ = (unsigned char)( tmp[ 0 ] * 255 );
 392             *ptr++ = (unsigned char)( tmp[ 1 ] * 255 );
 393             *ptr++ = (unsigned char)( tmp[ 2 ] * 255 );
 394           }
 395         }
 396         cubeMap->setImage(osg::TextureCubeMap::NEGATIVE_Y, image);
 397
 398         image = new osg::Image;
 399         image->allocateImage(size, size, 1, GL_RGB, GL_UNSIGNED_BYTE);
 400         ptr = image->data(0, 0);
 401         for (int j = 0; j < size; j++ ) {
 402           for (int i = 0; i < size; i++ ) {
 403             osg::Vec3 tmp(( i + offset - half_size ),
 404                           -( j + offset - half_size ), half_size );
 405             tmp.normalize();
 406             tmp = tmp*0.5 - zero_normal;
 407
 408             *ptr++ = (unsigned char)( tmp[ 0 ] * 255 );
 409             *ptr++ = (unsigned char)( tmp[ 1 ] * 255 );
 410             *ptr++ = (unsigned char)( tmp[ 2 ] * 255 );
 411           }
 412         }
 413         cubeMap->setImage(osg::TextureCubeMap::POSITIVE_Z, image);
 414
 415         image = new osg::Image;
 416         image->allocateImage(size, size, 1, GL_RGB, GL_UNSIGNED_BYTE);
 417         ptr = image->data(0, 0);
 418         for (int j = 0; j < size; j++ ) {
 419           for (int i = 0; i < size; i++ ) {
 420             osg::Vec3 tmp(-( i + offset - half_size ),
 421                           -( j + offset - half_size ), -half_size );
 422             tmp.normalize();
 423             tmp = tmp*0.5 - zero_normal;
 424             *ptr++ = (unsigned char)( tmp[ 0 ] * 255 );
 425             *ptr++ = (unsigned char)( tmp[ 1 ] * 255 );
 426             *ptr++ = (unsigned char)( tmp[ 2 ] * 255 );
 427           }
 428         }
 429         cubeMap->setImage(osg::TextureCubeMap::NEGATIVE_Z, image);
 430
 431         osg::StateSet* state;
 432         state = SGMakeState(texture_path, "overcast.png", "overcast_n.png");
 433         layer_states[SG_CLOUD_OVERCAST] = state;
 434         state = SGMakeState(texture_path, "overcast_top.png", "overcast_top_n.png");
 435         layer_states2[SG_CLOUD_OVERCAST] = state;
 436
 437         state = SGMakeState(texture_path, "broken.png", "broken_n.png");
 438         layer_states[SG_CLOUD_BROKEN] = state;
 439         layer_states2[SG_CLOUD_BROKEN] = state;
 440
 441         state = SGMakeState(texture_path, "scattered.png", "scattered_n.png");
 442         layer_states[SG_CLOUD_SCATTERED] = state;
 443         layer_states2[SG_CLOUD_SCATTERED] = state;
 444
 445         state = SGMakeState(texture_path, "few.png", "few_n.png");
 446         layer_states[SG_CLOUD_FEW] = state;
 447         layer_states2[SG_CLOUD_FEW] = state;
 448
 449         state = SGMakeState(texture_path, "cirrus.png", "cirrus_n.png");
 450         layer_states[SG_CLOUD_CIRRUS] = state;
 451         layer_states2[SG_CLOUD_CIRRUS] = state;
 452
 453         layer_states[SG_CLOUD_CLEAR] = 0;
 454         layer_states2[SG_CLOUD_CLEAR] = 0;
 455
 456       // OSGFIXME
 457 //              SGNewCloud::loadTextures(texture_path.str());
 458 //              layer3D->buildTestLayer();
 459     }
 460
 461     scale = 4000.0;
 462     last_lon = last_lat = -999.0f;
 463
 464     setTextureOffset(base);
 465     // build the cloud layer
 466     const float layer_scale = layer_span / scale;
 467     const float mpi = SG_PI/4;
 468
 469     // caclculate the difference between a flat-earth model and
 470     // a round earth model given the span and altutude ASL of
 471     // the cloud layer. This is the difference in altitude between
 472     // the top of the inverted bowl and the edge of the bowl.
 473     // const float alt_diff = layer_asl * 0.8;
 474     const float layer_to_core = (SG_EARTH_RAD * 1000 + layer_asl);
 475     const float layer_angle = 0.5*layer_span / layer_to_core; // The angle is half the span
 476     const float border_to_core = layer_to_core * cos(layer_angle);
 477     const float alt_diff = layer_to_core - border_to_core;
 478
 479     for (int i = 0; i < 4; i++) {
 480       if ( layer[i] != NULL ) {
 481         layer_transform->removeChild(layer[i].get()); // automatic delete
 482       }
 483
 484       vl[i] = new osg::Vec3Array;
 485       cl[i] = new osg::Vec4Array;
 486       tl[i] = new osg::Vec2Array;
 487
 488
 489       osg::Vec3 vertex(layer_span*(i-2)/2, -layer_span,
 490                        alt_diff * (sin(i*mpi) - 2));
 491       osg::Vec2 tc(layer_scale * i/4, 0.0f);
 492       osg::Vec4 color(1.0f, 1.0f, 1.0f, (i == 0) ? 0.0f : 0.15f);
 493
 494       cl[i]->push_back(color);
 495       vl[i]->push_back(vertex);
 496       tl[i]->push_back(tc);
 497
 498       for (int j = 0; j < 4; j++) {
 499         vertex = osg::Vec3(layer_span*(i-1)/2, layer_span*(j-2)/2,
 500                            alt_diff * (sin((i+1)*mpi) + sin(j*mpi) - 2));
 501         tc = osg::Vec2(layer_scale * (i+1)/4, layer_scale * j/4);
 502         color = osg::Vec4(1.0f, 1.0f, 1.0f,
 503                           ( (j == 0) || (i == 3)) ?
 504                           ( (j == 0) && (i == 3)) ? 0.0f : 0.15f : 1.0f );
 505
 506         cl[i]->push_back(color);
 507         vl[i]->push_back(vertex);
 508         tl[i]->push_back(tc);
 509
 510         vertex = osg::Vec3(layer_span*(i-2)/2, layer_span*(j-1)/2,
 511                            alt_diff * (sin(i*mpi) + sin((j+1)*mpi) - 2) );
 512         tc = osg::Vec2(layer_scale * i/4, layer_scale * (j+1)/4 );
 513         color = osg::Vec4(1.0f, 1.0f, 1.0f,
 514                           ((j == 3) || (i == 0)) ?
 515                           ((j == 3) && (i == 0)) ? 0.0f : 0.15f : 1.0f );
 516         cl[i]->push_back(color);
 517         vl[i]->push_back(vertex);
 518         tl[i]->push_back(tc);
 519       }
 520
 521       vertex = osg::Vec3(layer_span*(i-1)/2, layer_span,
 522                          alt_diff * (sin((i+1)*mpi) - 2));
 523
 524       tc = osg::Vec2(layer_scale * (i+1)/4, layer_scale);
 525
 526       color = osg::Vec4(1.0f, 1.0f, 1.0f, (i == 3) ? 0.0f : 0.15f );
 527
 528       cl[i]->push_back( color );
 529       vl[i]->push_back( vertex );
 530       tl[i]->push_back( tc );
 531
 532       osg::Geometry* geometry = new osg::Geometry;
 533       geometry->setUseDisplayList(false);
 534       geometry->setVertexArray(vl[i].get());
 535       geometry->setNormalBinding(osg::Geometry::BIND_OFF);
 536       geometry->setColorArray(cl[i].get());
 537       geometry->setColorBinding(osg::Geometry::BIND_PER_VERTEX);
 538       geometry->setTexCoordArray(0, tl[i].get());
 539       geometry->addPrimitiveSet(new osg::DrawArrays(GL_TRIANGLE_STRIP, 0, vl[i]->size()));
 540       layer[i] = new osg::Geode;
 541
 542       std::stringstream sstr;
 543       sstr << "Cloud Layer (" << i << ")";
 544       geometry->setName(sstr.str());
 545       layer[i]->setName(sstr.str());
 546       layer[i]->addDrawable(geometry);
 547       layer_transform->addChild(layer[i].get());
 548     }
 549
 550     //OSGFIXME: true
 551     if ( layer_states[layer_coverage].valid() ) {
 552       osg::CopyOp copyOp;    // shallow copy
 553       // render bin will be set in reposition
 554       osg::StateSet* stateSet = static_cast<osg::StateSet*>(layer_states2[layer_coverage]->clone(copyOp));
 555       stateSet->setDataVariance(osg::Object::DYNAMIC);
 556       group_top->setStateSet(stateSet);
 557       stateSet = static_cast<osg::StateSet*>(layer_states2[layer_coverage]->clone(copyOp));
 558       stateSet->setDataVariance(osg::Object::DYNAMIC);
 559       group_bottom->setStateSet(stateSet);
 560     }
 561 }
 562
 563 #if 0
 564             sgMat4 modelview,
 565                    tmp,
 566                    transform;
 567             ssgGetModelviewMatrix( modelview );
 568             layer_transform->getTransform( transform );
 569
 570             sgTransposeNegateMat4( tmp, transform );
 571
 572             sgPostMultMat4( transform, modelview );
 573             ssgLoadModelviewMatrix( transform );
 574
 575             sgVec3 lightVec;
 576             ssgGetLight( 0 )->getPosition( lightVec );
 577             sgNegateVec3( lightVec );
 578             sgXformVec3( lightVec, tmp );
 579
 580             for ( int i = 0; i < 25; i++ ) {
 581                 CloudVertex &v = vertices[ i ];
 582                 sgSetVec3( v.tangentSpLight,
 583                            sgScalarProductVec3( v.sTangent, lightVec ),
 584                            sgScalarProductVec3( v.tTangent, lightVec ),
 585                            sgScalarProductVec3( v.normal, lightVec ) );
 586             }
 587
 588             ssgTexture *decal = color_map[ layer_coverage ][ top ? 1 : 0 ];
 589             if ( top && decal == 0 ) {
 590                 decal = color_map[ layer_coverage ][ 0 ];
 591             }
 592             ssgTexture *normal = normal_map[ layer_coverage ][ top ? 1 : 0 ];
 593             if ( top && normal == 0 ) {
 594                 normal = normal_map[ layer_coverage ][ 0 ];
 595             }
 596
 597             glDisable( GL_LIGHTING );
 598             glDisable( GL_CULL_FACE );
 599 //            glDisable( GL_ALPHA_TEST );
 600             if ( layer_coverage == SG_CLOUD_FEW ) {
 601                 glEnable( GL_ALPHA_TEST );
 602                 glAlphaFunc ( GL_GREATER, 0.01 );
 603             }
 604             glEnable( GL_BLEND );
 605             glBlendFunc( GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA );
 606
 607             glShadeModel( GL_SMOOTH );
 608             glEnable( GL_COLOR_MATERIAL );
 609             sgVec4 color;
 610             float emis = 0.05;
 611             if ( 1 ) {
 612                 ssgGetLight( 0 )->getColour( GL_DIFFUSE, color );
 613                 emis = ( color[0]+color[1]+color[2] ) / 3.0;
 614                 if ( emis < 0.05 )
 615                     emis = 0.05;
 616             }
 617             sgSetVec4( color, emis, emis, emis, 0.0 );
 618             glMaterialfv( GL_FRONT_AND_BACK, GL_EMISSION, color );
 619             sgSetVec4( color, 1.0f, 1.0f, 1.0f, 0.0 );
 620             glMaterialfv( GL_FRONT_AND_BACK, GL_AMBIENT, color );
 621             sgSetVec4( color, 1.0, 1.0, 1.0, 0.0 );
 622             glMaterialfv( GL_FRONT_AND_BACK, GL_DIFFUSE, color );
 623             sgSetVec4( color, 0.0, 0.0, 0.0, 0.0 );
 624             glMaterialfv( GL_FRONT_AND_BACK, GL_SPECULAR, color );
 625
 626             glColor4f( 1.0f, 1.0f, 1.0f, 1.0f );
 627
 628             glActiveTexturePtr( GL_TEXTURE0_ARB );
 629             glBindTexture( GL_TEXTURE_2D, normal->getHandle() );
 630             glEnable( GL_TEXTURE_2D );
 631
 632             //Bind normalisation cube map to texture unit 1
 633             glActiveTexturePtr( GL_TEXTURE1_ARB );
 634             glBindTexture( GL_TEXTURE_CUBE_MAP_ARB, normalization_cube_map );
 635             glEnable( GL_TEXTURE_CUBE_MAP_ARB );
 636             glActiveTexturePtr( GL_TEXTURE0_ARB );
 637
 638             //Set vertex arrays for cloud
 639             glVertexPointer( 3, GL_FLOAT, sizeof(CloudVertex), &vertices[0].position );
 640             glEnableClientState( GL_VERTEX_ARRAY );
 641 /*
 642             if ( nb_texture_unit >= 3 ) {
 643                 glColorPointer( 4, GL_FLOAT, sizeof(CloudVertex), &vertices[0].color );
 644                 glEnableClientState( GL_COLOR_ARRAY );
 645             }
 646 */
 647             //Send texture coords for normal map to unit 0
 648             glTexCoordPointer( 2, GL_FLOAT, sizeof(CloudVertex), &vertices[0].texCoord );
 649             glEnableClientState( GL_TEXTURE_COORD_ARRAY );
 650
 651             //Send tangent space light vectors for normalisation to unit 1
 652             glClientActiveTexturePtr( GL_TEXTURE1_ARB );
 653             glTexCoordPointer( 3, GL_FLOAT, sizeof(CloudVertex), &vertices[0].tangentSpLight );
 654             glEnableClientState( GL_TEXTURE_COORD_ARRAY );
 655
 656             //Set up texture environment to do (tex0 dot tex1)*color
 657             glTexEnvi( GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_COMBINE_ARB );
 658             glTexEnvi( GL_TEXTURE_ENV, GL_SOURCE0_RGB_ARB, GL_TEXTURE );
 659             glTexEnvi( GL_TEXTURE_ENV, GL_COMBINE_RGB_ARB, GL_REPLACE );
 660             glTexEnvi( GL_TEXTURE_ENV, GL_SOURCE0_ALPHA_ARB, GL_TEXTURE );
 661             glTexEnvi( GL_TEXTURE_ENV, GL_COMBINE_ALPHA_ARB, GL_REPLACE );
 662
 663 // use TexEnvCombine to add the highlights to the original lighting
 664 osg::TexEnvCombine *te = new osg::TexEnvCombine;
 665 te->setSource0_RGB(osg::TexEnvCombine::TEXTURE);
 666 te->setCombine_RGB(osg::TexEnvCombine::REPLACE);
 667 te->setSource0_Alpha(osg::TexEnvCombine::TEXTURE);
 668 te->setCombine_Alpha(osg::TexEnvCombine::REPLACE);
 669 ss->setTextureAttributeAndModes(0, te, osg::StateAttribute::OVERRIDE | osg::StateAttribute::ON);
 670
 671
 672             glActiveTexturePtr( GL_TEXTURE1_ARB );
 673
 674             glTexEnvi( GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_COMBINE_ARB );
 675             glTexEnvi( GL_TEXTURE_ENV, GL_SOURCE0_RGB_ARB, GL_TEXTURE );
 676             glTexEnvi( GL_TEXTURE_ENV, GL_COMBINE_RGB_ARB, GL_DOT3_RGB_ARB );
 677             glTexEnvi( GL_TEXTURE_ENV, GL_SOURCE1_RGB_ARB, GL_PREVIOUS_ARB );
 678             glTexEnvi( GL_TEXTURE_ENV, GL_SOURCE0_ALPHA_ARB, GL_PREVIOUS_ARB );
 679             glTexEnvi( GL_TEXTURE_ENV, GL_COMBINE_ALPHA_ARB, GL_REPLACE );
 680
 681 osg::TexEnvCombine *te = new osg::TexEnvCombine;
 682 te->setSource0_RGB(osg::TexEnvCombine::TEXTURE);
 683 te->setCombine_RGB(osg::TexEnvCombine::DOT3_RGB);
 684 te->setSource1_RGB(osg::TexEnvCombine::PREVIOUS);
 685 te->setSource0_Alpha(osg::TexEnvCombine::PREVIOUS);
 686 te->setCombine_Alpha(osg::TexEnvCombine::REPLACE);
 687 ss->setTextureAttributeAndModes(0, te, osg::StateAttribute::OVERRIDE | osg::StateAttribute::ON);
 688
 689
 690             if ( nb_texture_unit >= 3 ) {
 691                 glActiveTexturePtr( GL_TEXTURE2_ARB );
 692                 glBindTexture( GL_TEXTURE_2D, decal->getHandle() );
 693
 694                 glClientActiveTexturePtr( GL_TEXTURE2_ARB );
 695                 glTexCoordPointer( 2, GL_FLOAT, sizeof(CloudVertex), &vertices[0].texCoord );
 696                 glEnableClientState( GL_TEXTURE_COORD_ARRAY );
 697
 698                 glTexEnvi( GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_COMBINE_ARB );
 699                 glTexEnvi( GL_TEXTURE_ENV, GL_COMBINE_RGB_ARB, GL_ADD );
 700                 glTexEnvi( GL_TEXTURE_ENV, GL_SOURCE0_RGB_ARB, GL_TEXTURE );
 701                 glTexEnvi( GL_TEXTURE_ENV, GL_SOURCE1_RGB_ARB, GL_PREVIOUS_ARB );
 702
 703                 glClientActiveTexturePtr( GL_TEXTURE0_ARB );
 704                 glActiveTexturePtr( GL_TEXTURE0_ARB );
 705
 706                 //Draw cloud layer
 707                 glDrawElements( GL_TRIANGLE_STRIP, 10, GL_UNSIGNED_INT, &indices[0] );
 708                 glDrawElements( GL_TRIANGLE_STRIP, 10, GL_UNSIGNED_INT, &indices[10] );
 709                 glDrawElements( GL_TRIANGLE_STRIP, 10, GL_UNSIGNED_INT, &indices[20] );
 710                 glDrawElements( GL_TRIANGLE_STRIP, 10, GL_UNSIGNED_INT, &indices[30] );
 711
 712                 glDisable( GL_TEXTURE_2D );
 713                 glActiveTexturePtr( GL_TEXTURE1_ARB );
 714                 glDisable( GL_TEXTURE_CUBE_MAP_ARB );
 715                 glActiveTexturePtr( GL_TEXTURE2_ARB );
 716                 glDisable( GL_TEXTURE_2D );
 717                 glActiveTexturePtr( GL_TEXTURE0_ARB );
 718
 719                 glDisableClientState( GL_TEXTURE_COORD_ARRAY );
 720                 glClientActiveTexturePtr( GL_TEXTURE1_ARB );
 721                 glDisableClientState( GL_TEXTURE_COORD_ARRAY );
 722                 glClientActiveTexturePtr( GL_TEXTURE2_ARB );
 723                 glDisableClientState( GL_TEXTURE_COORD_ARRAY );
 724                 glClientActiveTexturePtr( GL_TEXTURE0_ARB );
 725
 726                 glDisableClientState( GL_COLOR_ARRAY );
 727                 glEnable( GL_LIGHTING );
 728
 729                 glTexEnvi( GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE );
 730
 731             } else {
 732                 glClientActiveTexturePtr( GL_TEXTURE0_ARB );
 733                 glActiveTexturePtr( GL_TEXTURE0_ARB );
 734
 735                 //Draw cloud layer
 736                 glDrawElements( GL_TRIANGLE_STRIP, 10, GL_UNSIGNED_INT, &indices[0] );
 737                 glDrawElements( GL_TRIANGLE_STRIP, 10, GL_UNSIGNED_INT, &indices[10] );
 738                 glDrawElements( GL_TRIANGLE_STRIP, 10, GL_UNSIGNED_INT, &indices[20] );
 739                 glDrawElements( GL_TRIANGLE_STRIP, 10, GL_UNSIGNED_INT, &indices[30] );
 740
 741                 //Disable textures
 742                 glDisable( GL_TEXTURE_2D );
 743
 744                 glActiveTexturePtr( GL_TEXTURE1_ARB );
 745                 glDisable( GL_TEXTURE_CUBE_MAP_ARB );
 746                 glActiveTexturePtr( GL_TEXTURE0_ARB );
 747
 748                 //disable vertex arrays
 749                 glDisableClientState( GL_VERTEX_ARRAY );
 750
 751                 glDisableClientState( GL_TEXTURE_COORD_ARRAY );
 752                 glClientActiveTexturePtr( GL_TEXTURE1_ARB );
 753                 glDisableClientState( GL_TEXTURE_COORD_ARRAY );
 754                 glClientActiveTexturePtr( GL_TEXTURE0_ARB );
 755
 756                 //Return to standard modulate texenv
 757                 glTexEnvi( GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE );
 758
 759                 if ( layer_coverage == SG_CLOUD_OVERCAST ) {
 760                     glDepthFunc(GL_LEQUAL);
 761
 762                     glEnable( GL_LIGHTING );
 763                     sgVec4 color;
 764                     ssgGetLight( 0 )->getColour( GL_DIFFUSE, color );
 765                     float average = ( color[0] + color[1] + color[2] ) / 3.0f;
 766                     average = 0.15 + average/10;
 767                     sgVec4 averageColor;
 768                     sgSetVec4( averageColor, average, average, average, 1.0f );
 769                     ssgGetLight( 0 )->setColour( GL_DIFFUSE, averageColor );
 770
 771                     glBlendColorPtr( average, average, average, 1.0f );
 772                     glBlendFunc( GL_ONE_MINUS_CONSTANT_COLOR, GL_CONSTANT_COLOR );
 773
 774                     //Perform a second pass to color the torus
 775                     //Bind decal texture
 776                     glBindTexture( GL_TEXTURE_2D, decal->getHandle() );
 777                     glEnable(GL_TEXTURE_2D);
 778
 779                     //Set vertex arrays for torus
 780                     glVertexPointer( 3, GL_FLOAT, sizeof(CloudVertex), &vertices[0].position );
 781                     glEnableClientState( GL_VERTEX_ARRAY );
 782
 783                     //glColorPointer( 4, GL_FLOAT, sizeof(CloudVertex), &vertices[0].color );
 784                     //glEnableClientState( GL_COLOR_ARRAY );
 785
 786                     glNormalPointer( GL_FLOAT, sizeof(CloudVertex), &vertices[0].normal );
 787                     glEnableClientState( GL_NORMAL_ARRAY );
 788
 789                     glTexCoordPointer( 2, GL_FLOAT, sizeof(CloudVertex), &vertices[0].texCoord );
 790                     glEnableClientState( GL_TEXTURE_COORD_ARRAY );
 791
 792                     //Draw cloud layer
 793                     glDrawElements( GL_TRIANGLE_STRIP, 10, GL_UNSIGNED_INT, &indices[0] );
 794                     glDrawElements( GL_TRIANGLE_STRIP, 10, GL_UNSIGNED_INT, &indices[10] );
 795                     glDrawElements( GL_TRIANGLE_STRIP, 10, GL_UNSIGNED_INT, &indices[20] );
 796                     glDrawElements( GL_TRIANGLE_STRIP, 10, GL_UNSIGNED_INT, &indices[30] );
 797
 798                     ssgGetLight( 0 )->setColour( GL_DIFFUSE, color );
 799
 800                     glDisableClientState( GL_TEXTURE_COORD_ARRAY );
 801                 }
 802             }
 803             //Disable texture
 804             glDisable( GL_TEXTURE_2D );
 805
 806             glDisableClientState( GL_VERTEX_ARRAY );
 807             glDisableClientState( GL_NORMAL_ARRAY );
 808
 809             glBlendFunc( GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA );
 810             glEnable( GL_CULL_FACE );
 811             glDepthFunc(GL_LESS);
 812
 813             ssgLoadModelviewMatrix( modelview );
 814 #endif
 815
 816 // repaint the cloud layer colors
 817 bool SGCloudLayer::repaint( const SGVec3f& fog_color ) {
 818     osg::Vec4f combineColor(fog_color.osg(), cloud_alpha);
 819     osg::TexEnvCombine* combiner
 820         = dynamic_cast<osg::TexEnvCombine*>(layer_root->getStateSet()
 821                                             ->getTextureAttribute(1, osg::StateAttribute::TEXENV));
 822     combiner->setConstantColor(combineColor);
 823     return true;
 824 }
 825
 826 // reposition the cloud layer at the specified origin and orientation
 827 // lon specifies a rotation about the Z axis
 828 // lat specifies a rotation about the new Y axis
 829 // spin specifies a rotation about the new Z axis (and orients the
 830 // sunrise/set effects
 831 bool SGCloudLayer::reposition( const SGVec3f& p, const SGVec3f& up, double lon, double lat,
 832                                double alt, double dt )
 833 {
 834     // combine p and asl (meters) to get translation offset
 835     osg::Vec3 asl_offset(up.osg());
 836     asl_offset.normalize();
 837     if ( alt <= layer_asl ) {
 838         asl_offset *= layer_asl;
 839     } else {
 840         asl_offset *= layer_asl + layer_thickness;
 841     }
 842
 843     // cout << "asl_offset = " << asl_offset[0] << "," << asl_offset[1]
 844     //      << "," << asl_offset[2] << endl;
 845     asl_offset += p.osg();
 846     // cout << "  asl_offset = " << asl_offset[0] << "," << asl_offset[1]
 847     //      << "," << asl_offset[2] << endl;
 848
 849     osg::Matrix T, LON, LAT;
 850     // Translate to zero elevation
 851     // Point3D zero_elev = current_view.get_cur_zero_elev();
 852     T.makeTranslate( asl_offset );
 853
 854     // printf("  Translated to %.2f %.2f %.2f\n",
 855     //        zero_elev.x, zero_elev.y, zero_elev.z );
 856
 857     // Rotate to proper orientation
 858     // printf("  lon = %.2f  lat = %.2f\n",
 859     //        lon * SGD_RADIANS_TO_DEGREES,
 860     //        lat * SGD_RADIANS_TO_DEGREES);
 861     LON.makeRotate(lon, osg::Vec3(0, 0, 1));
 862
 863     // xglRotatef( 90.0 - f->get_Latitude() * SGD_RADIANS_TO_DEGREES,
 864     //             0.0, 1.0, 0.0 );
 865     LAT.makeRotate(90.0 * SGD_DEGREES_TO_RADIANS - lat, osg::Vec3(0, 1, 0));
 866
 867     layer_transform->setMatrix( LAT*LON*T );
 868     // The layers need to be drawn in order because they are
 869     // translucent, but OSG transparency sorting doesn't work because
 870     // the cloud polys are huge. However, the ordering is simple: the
 871     // bottom polys should be drawn from high altitude to low, and the
 872     // top polygons from low to high. The altitude can be used
 873     // directly to order the polygons!
 874     group_bottom->getStateSet()->setRenderBinDetails(-(int)layer_asl,
 875                                                      "RenderBin");
 876     group_top->getStateSet()->setRenderBinDetails((int)layer_asl,
 877                                                   "RenderBin");
 878     if ( alt <= layer_asl ) {
 879       layer_root->setSingleChildOn(0);
 880     } else if ( alt >= layer_asl + layer_thickness ) {
 881       layer_root->setSingleChildOn(1);
 882     } else {
 883       layer_root->setAllChildrenOff();
 884     }
 885
 886
 887     // now calculate update texture coordinates
 888     if ( last_lon < -900 ) {
 889         last_lon = lon;
 890         last_lat = lat;
 891     }
 892
 893     double sp_dist = speed*dt;
 894
 895     if ( lon != last_lon || lat != last_lat || sp_dist != 0 ) {
 896         Point3D start( last_lon, last_lat, 0.0 );
 897         Point3D dest( lon, lat, 0.0 );
 898         double course = 0.0, dist = 0.0;
 899
 900         calc_gc_course_dist( dest, start, &course, &dist );
 901         // cout << "course = " << course << ", dist = " << dist << endl;
 902
 903         // if start and dest are too close together,
 904         // calc_gc_course_dist() can return a course of "nan".  If
 905         // this happens, lets just use the last known good course.
 906         // This is a hack, and it would probably be better to make
 907         // calc_gc_course_dist() more robust.
 908         if ( isnan(course) ) {
 909             course = last_course;
 910         } else {
 911             last_course = course;
 912         }
 913
 914         // calculate cloud movement due to external forces
 915         double ax = 0.0, ay = 0.0, bx = 0.0, by = 0.0;
 916
 917         if (dist > 0.0) {
 918             ax = cos(course) * dist;
 919             ay = sin(course) * dist;
 920         }
 921
 922         if (sp_dist > 0) {
 923             bx = cos((180.0-direction) * SGD_DEGREES_TO_RADIANS) * sp_dist;
 924             by = sin((180.0-direction) * SGD_DEGREES_TO_RADIANS) * sp_dist;
 925         }
 926
 927
 928         double xoff = (ax + bx) / (2 * scale);
 929         double yoff = (ay + by) / (2 * scale);
 930
 931         const float layer_scale = layer_span / scale;
 932
 933         // cout << "xoff = " << xoff << ", yoff = " << yoff << endl;
 934         base[0] += xoff;
 935
 936         // the while loops can lead to *long* pauses if base[0] comes
 937         // with a bogus value.
 938         // while ( base[0] > 1.0 ) { base[0] -= 1.0; }
 939         // while ( base[0] < 0.0 ) { base[0] += 1.0; }
 940         if ( base[0] > -10.0 && base[0] < 10.0 ) {
 941             base[0] -= (int)base[0];
 942         } else {
 943             SG_LOG(SG_ASTRO, SG_DEBUG,
 944                 "Error: base = " << base[0] << "," << base[1] <<
 945                 " course = " << course << " dist = " << dist );
 946             base[0] = 0.0;
 947         }
 948
 949         base[1] += yoff;
 950         // the while loops can lead to *long* pauses if base[0] comes
 951         // with a bogus value.
 952         // while ( base[1] > 1.0 ) { base[1] -= 1.0; }
 953         // while ( base[1] < 0.0 ) { base[1] += 1.0; }
 954         if ( base[1] > -10.0 && base[1] < 10.0 ) {
 955             base[1] -= (int)base[1];
 956         } else {
 957             SG_LOG(SG_ASTRO, SG_DEBUG,
 958                     "Error: base = " << base[0] << "," << base[1] <<
 959                     " course = " << course << " dist = " << dist );
 960             base[1] = 0.0;
 961         }
 962
 963         // cout << "base = " << base[0] << "," << base[1] << endl;
 964
 965         setTextureOffset(base);
 966         last_lon = lon;
 967         last_lat = lat;
 968     }
 969
 970 //      layer3D->reposition( p, up, lon, lat, alt, dt, direction, speed);
 971     return true;
 972 }