simgear/scene/tgdb/SGBuildingBin.cxx

   1 /* -*-c++-*-
   2  *
   3  * Copyright (C) 2012 Stuart Buchanan
   4  *
   5  * This program is free software; you can redistribute it and/or
   6  * modify it under the terms of the GNU General Public License as
   7  * published by the Free Software Foundation; either version 2 of the
   8  * License, or (at your option) any later version.
   9  *
  10  * This program is distributed in the hope that it will be useful, but
  11  * WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13  * General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License
  16  * along with this program; if not, write to the Free Software
  17  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
  18  * MA 02110-1301, USA.
  19  *
  20  */
  21
  22 #ifdef HAVE_CONFIG_H
  23 #  include <simgear_config.h>
  24 #endif
  25
  26 #include <algorithm>
  27 #include <vector>
  28 #include <string>
  29 #include <map>
  30
  31 #include <boost/foreach.hpp>
  32 #include <boost/tuple/tuple_comparison.hpp>
  33
  34 #include <osg/Geode>
  35 #include <osg/Geometry>
  36 #include <osg/Math>
  37 #include <osg/MatrixTransform>
  38 #include <osg/Matrix>
  39 #include <osg/ShadeModel>
  40 #include <osg/Material>
  41 #include <osg/CullFace>
  42
  43 #include <osgDB/ReadFile>
  44 #include <osgDB/FileUtils>
  45
  46 #include <simgear/debug/logstream.hxx>
  47 #include <simgear/math/SGLimits.hxx>
  48 #include <simgear/math/SGMisc.hxx>
  49 #include <simgear/math/sg_random.h>
  50 #include <simgear/misc/sg_path.hxx>
  51 #include <simgear/scene/material/Effect.hxx>
  52 #include <simgear/scene/material/EffectGeode.hxx>
  53 #include <simgear/scene/model/model.hxx>
  54 #include <simgear/props/props.hxx>
  55
  56 #include "ShaderGeometry.hxx"
  57 #include "SGBuildingBin.hxx"
  58
  59
  60 using namespace osg;
  61
  62 namespace simgear
  63 {
  64
  65 typedef std::map<std::string, osg::observer_ptr<osg::StateSet> > BuildingStateSetMap;
  66 static BuildingStateSetMap statesetmap;
  67
  68 typedef std::map<std::string, osg::observer_ptr<Effect> > EffectMap;
  69 static EffectMap buildingEffectMap;
  70
  71 // Building instance scheme:
  72 // vertex - local position of vertices, with 0,0,0 being the center front.
  73 // fog coord - rotation
  74 // color - xyz of tree quad origin, replicated 4 times.
  75
  76 struct BuildingBoundingBoxCallback : public Drawable::ComputeBoundingBoxCallback
  77 {
  78     BuildingBoundingBoxCallback() {}
  79     BuildingBoundingBoxCallback(const BuildingBoundingBoxCallback&, const CopyOp&) {}
  80     META_Object(simgear, BuildingBoundingBoxCallback);
  81     virtual BoundingBox computeBound(const Drawable&) const;
  82 };
  83
  84 BoundingBox
  85 BuildingBoundingBoxCallback::computeBound(const Drawable& drawable) const
  86 {
  87     BoundingBox bb;
  88     const Geometry* geom = static_cast<const Geometry*>(&drawable);
  89     const Vec3Array* v = static_cast<const Vec3Array*>(geom->getVertexArray());
  90     const Vec4Array* pos = static_cast<const Vec4Array*>(geom->getColorArray());
  91
  92     Geometry::PrimitiveSetList primSets = geom->getPrimitiveSetList();
  93     for (Geometry::PrimitiveSetList::const_iterator psitr = primSets.begin(), psend = primSets.end();
  94          psitr != psend;
  95          ++psitr) {
  96         DrawArrays* da = static_cast<DrawArrays*>(psitr->get());
  97         GLint psFirst = da->getFirst();
  98         GLint psEndVert = psFirst + da->getCount();
  99         for (GLint i = psFirst;i < psEndVert; ++i) {
 100             Vec3 pt = (*v)[i];
 101             Matrixd trnsfrm = Matrixd::rotate(- M_PI * 2 * (*pos)[i].a(), Vec3(0.0f, 0.0f, 1.0f));
 102             pt = pt * trnsfrm;
 103             pt += Vec3((*pos)[i].x(), (*pos)[i].y(), (*pos)[i].z());
 104             bb.expandBy(pt);
 105         }
 106     }
 107     return bb;
 108 }
 109
 110   // Set up the building set based on the material definitions
 111   SGBuildingBin::SGBuildingBin(const SGMaterial *mat) {
 112
 113     material_name = new std::string(mat->get_names()[0]);
 114     SG_LOG(SG_TERRAIN, SG_DEBUG, "Building material " << material_name);
 115     texture = new std::string(mat->get_building_texture());
 116     lightMap = new std::string(mat->get_building_lightmap());
 117     SG_LOG(SG_TERRAIN, SG_DEBUG, "Building texture " << texture);
 118
 119     // Generate a random seed for the building generation.
 120     mt seed;
 121     mt_init(&seed, unsigned(123));
 122
 123     smallSharedGeometry = new osg::Geometry();
 124     mediumSharedGeometry = new osg::Geometry();
 125     largeSharedGeometry = new osg::Geometry();
 126
 127     smallBuildingMaxRadius = std::max(mat->get_building_small_max_depth() * 0.5, mat->get_building_small_max_width() * 0.5);
 128     mediumBuildingMaxRadius = std::max(mat->get_building_medium_max_depth() * 0.5, mat->get_building_medium_max_width() * 0.5);
 129     largeBuildingMaxRadius = std::max(mat->get_building_large_max_depth() * 0.5, mat->get_building_large_max_width() * 0.5);
 130
 131     smallBuildingMaxDepth = mat->get_building_small_max_depth();
 132     mediumBuildingMaxDepth = mat->get_building_medium_max_depth();
 133     largeBuildingMaxDepth = mat->get_building_large_max_depth();
 134
 135     smallBuildingFraction = mat->get_building_small_fraction();
 136     mediumBuildingFraction = mat->get_building_medium_fraction();
 137
 138     buildingRange = mat->get_building_range();
 139
 140     SG_LOG(SG_TERRAIN, SG_DEBUG, "Building fractions " << smallBuildingFraction << " " << mediumBuildingFraction);
 141
 142
 143     // TODO: Reverse this - otherwise we never get any large buildings!
 144     BuildingType types[] = { SGBuildingBin::SMALL, SGBuildingBin::MEDIUM, SGBuildingBin::LARGE };
 145     BuildingList lists[] = { SGBuildingBin::smallBuildings, SGBuildingBin::mediumBuildings, SGBuildingBin::largeBuildings };
 146     ref_ptr<Geometry> geometries[] = { smallSharedGeometry, mediumSharedGeometry, largeSharedGeometry };
 147
 148     for (int bt=0; bt < 3; bt++) {
 149       SGBuildingBin::BuildingType buildingtype = types[bt];
 150       ref_ptr<Geometry> sharedGeometry = geometries[bt];
 151       BuildingList buildings = lists[bt];
 152
 153       osg::ref_ptr<osg::Vec3Array> v = new osg::Vec3Array;
 154       osg::ref_ptr<osg::Vec2Array> t = new osg::Vec2Array;
 155       osg::ref_ptr<osg::Vec3Array> n = new osg::Vec3Array;
 156
 157       v->reserve(BUILDING_SET_SIZE * VERTICES_PER_BUILDING);
 158       t->reserve(BUILDING_SET_SIZE * VERTICES_PER_BUILDING);
 159       n->reserve(BUILDING_SET_SIZE * VERTICES_PER_BUILDING);
 160
 161       sharedGeometry->setFogCoordBinding(osg::Geometry::BIND_PER_VERTEX);
 162       sharedGeometry->setComputeBoundingBoxCallback(new BuildingBoundingBoxCallback);
 163       sharedGeometry->setUseDisplayList(false);
 164
 165       for (unsigned int j = 0; j < BUILDING_SET_SIZE; j++) {
 166         float width;
 167         float depth;
 168         int floors;
 169         float height;
 170         bool pitched;
 171
 172         if (buildingtype == SGBuildingBin::SMALL) {
 173           // Small building
 174           width = mat->get_building_small_min_width() + mt_rand(&seed) * mt_rand(&seed) * (mat->get_building_small_max_width() - mat->get_building_small_min_width());
 175           depth = mat->get_building_small_min_depth() + mt_rand(&seed) * mt_rand(&seed) * (mat->get_building_small_max_depth() - mat->get_building_small_min_depth());
 176           floors = SGMisc<double>::round(mat->get_building_small_min_floors() + mt_rand(&seed) * (mat->get_building_small_max_floors() - mat->get_building_small_min_floors()));
 177           height = floors * (2.8 + mt_rand(&seed));
 178
 179           // Small buildings are never deeper than they are wide.
 180           if (depth > width) { depth = width; }
 181
 182           pitched = (mt_rand(&seed) < mat->get_building_small_pitch());
 183         } else if (buildingtype == SGBuildingBin::MEDIUM) {
 184           width = mat->get_building_medium_min_width() + mt_rand(&seed) * mt_rand(&seed) * (mat->get_building_medium_max_width() - mat->get_building_medium_min_width());
 185           depth = mat->get_building_medium_min_depth() + mt_rand(&seed) * mt_rand(&seed) * (mat->get_building_medium_max_depth() - mat->get_building_medium_min_depth());
 186           floors = SGMisc<double>::round(mat->get_building_medium_min_floors() + mt_rand(&seed) * (mat->get_building_medium_max_floors() - mat->get_building_medium_min_floors()));
 187           height = floors * (2.8 + mt_rand(&seed));
 188
 189           while ((height > width) && (floors > mat->get_building_medium_min_floors())) {
 190             // Ensure that medium buildings aren't taller than they are wide
 191             floors--;
 192             height = floors * (2.8 + mt_rand(&seed));
 193           }
 194
 195           pitched = (mt_rand(&seed) < mat->get_building_medium_pitch());
 196         } else {
 197           width = mat->get_building_large_min_width() + mt_rand(&seed) * (mat->get_building_large_max_width() - mat->get_building_large_min_width());
 198           depth = mat->get_building_large_min_depth() + mt_rand(&seed) * (mat->get_building_large_max_depth() - mat->get_building_large_min_depth());
 199           floors = SGMisc<double>::round(mat->get_building_large_min_floors() + mt_rand(&seed) * (mat->get_building_large_max_floors() - mat->get_building_large_min_floors()));
 200           height = floors * (2.8 + mt_rand(&seed));
 201           pitched = (mt_rand(&seed) < mat->get_building_large_pitch());
 202         }
 203
 204         Building building = Building(buildingtype,
 205                                     width,
 206                                     depth,
 207                                     height,
 208                                     floors,
 209                                     pitched);
 210
 211         buildings.push_back(building);
 212
 213         // Now create an OSG Geometry based on the Building
 214         float cw = 0.5f * building.width;
 215         float cd = building.depth;
 216         float ch = building.height;
 217
 218         // 0,0,0 is the bottom center of the front
 219         // face, e.g. where the front door would be
 220
 221         // BASEMENT
 222         // This exteds 10m below the main section
 223         // Front face
 224         v->push_back( osg::Vec3( 0, -cw, -10) ); // bottom right
 225         v->push_back( osg::Vec3( 0,  cw, -10) ); // bottom left
 226         v->push_back( osg::Vec3( 0,  cw,   0) ); // top left
 227         v->push_back( osg::Vec3( 0, -cw,   0) ); // top right
 228
 229         for (int i=0; i<4; ++i)
 230           n->push_back( osg::Vec3(1, 0, 0) ); // normal
 231
 232         // Left face
 233         v->push_back( osg::Vec3( -cd, -cw, -10) ); // bottom right
 234         v->push_back( osg::Vec3(   0, -cw, -10) ); // bottom left
 235         v->push_back( osg::Vec3(   0, -cw,   0) ); // top left
 236         v->push_back( osg::Vec3( -cd, -cw,   0) ); // top right
 237
 238         for (int i=0; i<4; ++i)
 239           n->push_back( osg::Vec3(0, -1, 0) ); // normal
 240
 241         // Back face
 242         v->push_back( osg::Vec3( -cd,  cw, -10) ); // bottom right
 243         v->push_back( osg::Vec3( -cd, -cw, -10) ); // bottom left
 244         v->push_back( osg::Vec3( -cd, -cw,   0) ); // top left
 245         v->push_back( osg::Vec3( -cd,  cw,   0) ); // top right
 246
 247         for (int i=0; i<4; ++i)
 248           n->push_back( osg::Vec3(-1, 0, 0) ); // normal
 249
 250         // Right face
 251         v->push_back( osg::Vec3(   0, cw, -10) ); // bottom right
 252         v->push_back( osg::Vec3( -cd, cw, -10) ); // bottom left
 253         v->push_back( osg::Vec3( -cd, cw,   0) ); // top left
 254         v->push_back( osg::Vec3(   0, cw,   0) ); // top right
 255
 256         for (int i=0; i<4; ++i)
 257           n->push_back( osg::Vec3(0, 1, 0) ); // normal
 258
 259         // MAIN BODY
 260         // Front face
 261         v->push_back( osg::Vec3( 0, -cw,  0) ); // bottom right
 262         v->push_back( osg::Vec3( 0,  cw,  0) ); // bottom left
 263         v->push_back( osg::Vec3( 0,  cw, ch) ); // top left
 264         v->push_back( osg::Vec3( 0, -cw, ch) ); // top right
 265
 266         for (int i=0; i<4; ++i)
 267           n->push_back( osg::Vec3(1, 0, 0) ); // normal
 268
 269         // Left face
 270         v->push_back( osg::Vec3( -cd, -cw,  0) ); // bottom right
 271         v->push_back( osg::Vec3(   0, -cw,  0) ); // bottom left
 272         v->push_back( osg::Vec3(   0, -cw, ch) ); // top left
 273         v->push_back( osg::Vec3( -cd, -cw, ch) ); // top right
 274
 275         for (int i=0; i<4; ++i)
 276           n->push_back( osg::Vec3(0, -1, 0) ); // normal
 277
 278         // Back face
 279         v->push_back( osg::Vec3( -cd,  cw,  0) ); // bottom right
 280         v->push_back( osg::Vec3( -cd, -cw,  0) ); // bottom left
 281         v->push_back( osg::Vec3( -cd, -cw, ch) ); // top left
 282         v->push_back( osg::Vec3( -cd,  cw, ch) ); // top right
 283
 284         for (int i=0; i<4; ++i)
 285           n->push_back( osg::Vec3(-1, 0, 0) ); // normal
 286
 287         // Right face
 288         v->push_back( osg::Vec3(   0, cw,  0) ); // bottom right
 289         v->push_back( osg::Vec3( -cd, cw,  0) ); // bottom left
 290         v->push_back( osg::Vec3( -cd, cw, ch) ); // top left
 291         v->push_back( osg::Vec3(   0, cw, ch) ); // top right
 292
 293         for (int i=0; i<4; ++i)
 294           n->push_back( osg::Vec3(0, 1, 0) ); // normal
 295
 296         // ROOF
 297         if (building.pitched) {
 298
 299           // Front pitched roof
 300           v->push_back( osg::Vec3(    0, -cw,   ch) ); // bottom right
 301           v->push_back( osg::Vec3(    0,  cw,   ch) ); // bottom left
 302           v->push_back( osg::Vec3(-0.5*cd,  cw, ch+3) ); // top left
 303           v->push_back( osg::Vec3(-0.5*cd, -cw, ch+3) ); // top right
 304
 305           for (int i=0; i<4; ++i)
 306             n->push_back( osg::Vec3(0.707, 0, 0.707) ); // normal
 307
 308           // Left pitched roof
 309           v->push_back( osg::Vec3(    -cd, -cw,   ch) ); // bottom right
 310           v->push_back( osg::Vec3(      0, -cw,   ch) ); // bottom left
 311           v->push_back( osg::Vec3(-0.5*cd, -cw, ch+3) ); // top left
 312           v->push_back( osg::Vec3(-0.5*cd, -cw, ch+3) ); // top right
 313
 314           for (int i=0; i<4; ++i)
 315             n->push_back( osg::Vec3(0, -1, 0) ); // normal
 316
 317           // Back pitched roof
 318           v->push_back( osg::Vec3(    -cd,  cw,   ch) ); // bottom right
 319           v->push_back( osg::Vec3(    -cd, -cw,   ch) ); // bottom left
 320           v->push_back( osg::Vec3(-0.5*cd, -cw, ch+3) ); // top left
 321           v->push_back( osg::Vec3(-0.5*cd,  cw, ch+3) ); // top right
 322
 323           for (int i=0; i<4; ++i)
 324             n->push_back( osg::Vec3(-0.707, 0, 0.707) ); // normal
 325
 326           // Right pitched roof
 327           v->push_back( osg::Vec3(      0, cw,   ch) ); // bottom right
 328           v->push_back( osg::Vec3(    -cd, cw,   ch) ); // bottom left
 329           v->push_back( osg::Vec3(-0.5*cd, cw, ch+3) ); // top left
 330           v->push_back( osg::Vec3(-0.5*cd, cw, ch+3) ); // top right
 331
 332           for (int i=0; i<4; ++i)
 333             n->push_back( osg::Vec3(0, 1, 0) ); // normal
 334         } else {
 335           // If the roof isn't pitched, we still generate the
 336           // vertices for simplicity later.
 337
 338           // Top of the roof
 339           v->push_back( osg::Vec3(  0, -cw, ch) ); // bottom right
 340           v->push_back( osg::Vec3(  0,  cw, ch) ); // bottom left
 341           v->push_back( osg::Vec3(-cd,  cw, ch) ); // top left
 342           v->push_back( osg::Vec3(-cd, -cw, ch) ); // top right
 343
 344           for (int i=0; i<4; ++i)
 345             n->push_back( osg::Vec3(0, 0, 1) ); // normal
 346
 347           // Left non-pitched roof
 348           v->push_back( osg::Vec3( -cd, -cw, ch) ); // bottom right
 349           v->push_back( osg::Vec3(   0, -cw, ch) ); // bottom left
 350           v->push_back( osg::Vec3(   0, -cw, ch) ); // top left
 351           v->push_back( osg::Vec3( -cd, -cw, ch) ); // top right
 352
 353           for (int i=0; i<4; ++i)
 354             n->push_back( osg::Vec3(0, -1, 0) ); // normal
 355
 356           // Back pitched roof
 357           v->push_back( osg::Vec3(-cd,  cw, ch) ); // bottom right
 358           v->push_back( osg::Vec3(-cd, -cw, ch) ); // bottom left
 359           v->push_back( osg::Vec3(-cd, -cw, ch) ); // top left
 360           v->push_back( osg::Vec3(-cd,  cw, ch) ); // top right
 361
 362           for (int i=0; i<4; ++i)
 363             n->push_back( osg::Vec3(1, 0, 0) ); // normal
 364
 365           // Right pitched roof
 366           v->push_back( osg::Vec3(  0, cw, ch) ); // bottom right
 367           v->push_back( osg::Vec3(-cd, cw, ch) ); // bottom left
 368           v->push_back( osg::Vec3(-cd, cw, ch) ); // top left
 369           v->push_back( osg::Vec3(  0, cw, ch) ); // top right
 370
 371           for (int i=0; i<4; ++i)
 372             n->push_back( osg::Vec3(0, 1, 0) ); // normal
 373         }
 374
 375         // The 1024x1024 texture is split into 32x16 blocks.
 376         // For a small building, each block is 6m wide and 3m high.
 377         // For a medium building, each block is 10m wide and 3m high.
 378         // For a large building, each block is 20m wide and 3m high
 379
 380         if (building.type == SGBuildingBin::SMALL) {
 381           // Small buildings are represented on the bottom 5 rows of 3 floors
 382           int row = ((int) (mt_rand(&seed) * 1000)) % 5;
 383           float base_y = (float) row * 16.0 * 3.0 / 1024.0;
 384           float top_y = base_y + 16.0 * (float) building.floors / 1024.0;
 385           float left_x = 32.0 / 1024.0 * round((float) building.width / 6.0f);
 386           float right_x = 0.0f;
 387           float front_x = 384.0/1024.0;
 388           float back_x = 384.0/1024.0 + 32.0 / 1024.0 * round((float) building.depth/ 6.0f);
 389
 390           // BASEMENT - uses the baseline texture
 391           for (unsigned int i = 0; i < 16; i++) {
 392             t->push_back( osg::Vec2( left_x, base_y) );
 393           }
 394           // MAIN BODY
 395           // Front
 396           t->push_back( osg::Vec2( right_x, base_y) ); // bottom right
 397           t->push_back( osg::Vec2( left_x,  base_y) ); // bottom left
 398           t->push_back( osg::Vec2( left_x,  top_y ) ); // top left
 399           t->push_back( osg::Vec2( right_x, top_y ) ); // top right
 400
 401           // Left
 402           t->push_back( osg::Vec2( front_x, base_y) ); // bottom right
 403           t->push_back( osg::Vec2( back_x,  base_y) ); // bottom left
 404           t->push_back( osg::Vec2( back_x,  top_y ) ); // top left
 405           t->push_back( osg::Vec2( front_x, top_y ) ); // top right
 406
 407           // Back (same as front for the moment)
 408           t->push_back( osg::Vec2( right_x, base_y) ); // bottom right
 409           t->push_back( osg::Vec2( left_x,  base_y) ); // bottom left
 410           t->push_back( osg::Vec2( left_x,  top_y ) ); // top left
 411           t->push_back( osg::Vec2( right_x, top_y ) ); // top right
 412
 413           // Right (same as left for the moment)
 414           t->push_back( osg::Vec2( front_x, base_y) ); // bottom right
 415           t->push_back( osg::Vec2( back_x,  base_y) ); // bottom left
 416           t->push_back( osg::Vec2( back_x,  top_y ) ); // top left
 417           t->push_back( osg::Vec2( front_x, top_y ) ); // top right
 418
 419           // ROOF
 420           if (building.pitched) {
 421             // Use the entire height of the roof texture
 422             top_y = base_y + 16.0 * 3.0 / 1024.0;
 423             left_x = 512/1024.0 + 32.0 / 1024.0 * round(building.width / 6.0f);
 424             right_x = 512/1024.0;
 425             front_x = 480.0/1024.0;
 426             back_x = 512.0/1024.0;
 427
 428             // Front
 429             t->push_back( osg::Vec2( right_x, base_y) ); // bottom right
 430             t->push_back( osg::Vec2( left_x,  base_y) ); // bottom left
 431             t->push_back( osg::Vec2( left_x,  top_y ) ); // top left
 432             t->push_back( osg::Vec2( right_x, top_y ) ); // top right
 433
 434             // Left
 435             t->push_back( osg::Vec2( front_x, base_y) ); // bottom right
 436             t->push_back( osg::Vec2( back_x,  base_y) ); // bottom left
 437             t->push_back( osg::Vec2( back_x,  top_y ) ); // top left
 438             t->push_back( osg::Vec2( front_x, top_y ) ); // top right
 439
 440             // Back (same as front for the moment)
 441             t->push_back( osg::Vec2( right_x, base_y) ); // bottom right
 442             t->push_back( osg::Vec2( left_x,  base_y) ); // bottom left
 443             t->push_back( osg::Vec2( left_x,  top_y ) ); // top left
 444             t->push_back( osg::Vec2( right_x, top_y ) ); // top right
 445
 446             // Right (same as left for the moment)
 447             t->push_back( osg::Vec2( front_x, base_y) ); // bottom right
 448             t->push_back( osg::Vec2( back_x,  base_y) ); // bottom left
 449             t->push_back( osg::Vec2( back_x,  top_y ) ); // top left
 450             t->push_back( osg::Vec2( front_x, top_y ) ); // top right
 451           } else {
 452             // Flat roof
 453             left_x = 640.0/1024.0;
 454             right_x = 512.0/1024.0;
 455             // Use the entire height of the roof texture
 456             top_y = base_y + 16.0 * 3.0 / 1024.0;
 457
 458             // Flat roofs still have 4 surfaces, so we need to set the textures
 459             for (int i=0; i<4; ++i) {
 460               t->push_back( osg::Vec2( right_x, base_y) ); // bottom right
 461               t->push_back( osg::Vec2( left_x,  base_y) ); // bottom left
 462               t->push_back( osg::Vec2( left_x,  top_y ) ); // top left
 463               t->push_back( osg::Vec2( right_x, top_y ) ); // top right
 464             }
 465           }
 466
 467         }
 468
 469         if (building.type == SGBuildingBin::MEDIUM)
 470         {
 471           int column = ((int) (mt_rand(&seed) * 1000)) % 5;
 472           float base_y = 288 / 1024.0;
 473           float top_y = base_y + 16.0 * (float) building.floors / 1024.0;
 474           float left_x = column * 192.0 /1024.0 + 32.0 / 1024.0 * round((float) building.width / 10.0f);
 475           float right_x = column * 192.0 /1024.0;
 476
 477           // BASEMENT - uses the baseline texture
 478           for (unsigned int i = 0; i < 16; i++) {
 479             t->push_back( osg::Vec2( left_x, base_y) );
 480           }
 481
 482           // MAIN BODY
 483           // Front
 484           t->push_back( osg::Vec2( right_x, base_y) ); // bottom right
 485           t->push_back( osg::Vec2( left_x,  base_y) ); // bottom left
 486           t->push_back( osg::Vec2( left_x,  top_y ) ); // top left
 487           t->push_back( osg::Vec2( right_x, top_y ) ); // top right
 488
 489           // Left
 490           t->push_back( osg::Vec2( right_x, base_y) ); // bottom right
 491           t->push_back( osg::Vec2( left_x,  base_y) ); // bottom left
 492           t->push_back( osg::Vec2( left_x,  top_y ) ); // top left
 493           t->push_back( osg::Vec2( right_x, top_y ) ); // top right
 494
 495           // Back (same as front for the moment)
 496           t->push_back( osg::Vec2( right_x, base_y) ); // bottom right
 497           t->push_back( osg::Vec2( left_x,  base_y) ); // bottom left
 498           t->push_back( osg::Vec2( left_x,  top_y ) ); // top left
 499           t->push_back( osg::Vec2( right_x, top_y ) ); // top right
 500
 501           // Right (same as left for the moment)
 502           t->push_back( osg::Vec2( right_x, base_y) ); // bottom right
 503           t->push_back( osg::Vec2( left_x,  base_y) ); // bottom left
 504           t->push_back( osg::Vec2( left_x,  top_y ) ); // top left
 505           t->push_back( osg::Vec2( right_x, top_y ) ); // top right
 506
 507           // ROOF
 508           if (building.pitched) {
 509             base_y = 288.0/1024.0;
 510             top_y = 576.0/1024.0;
 511             left_x = 960.0/1024.0;
 512             right_x = 1.0;
 513
 514             // Front
 515             t->push_back( osg::Vec2( right_x, base_y) ); // bottom right
 516             t->push_back( osg::Vec2( left_x,  base_y) ); // bottom left
 517             t->push_back( osg::Vec2( left_x,  top_y ) ); // top left
 518             t->push_back( osg::Vec2( right_x, top_y ) ); // top right
 519
 520             // Left
 521             t->push_back( osg::Vec2( right_x, base_y) ); // bottom right
 522             t->push_back( osg::Vec2( left_x,  base_y) ); // bottom left
 523             t->push_back( osg::Vec2( left_x,  top_y ) ); // top left
 524             t->push_back( osg::Vec2( right_x, top_y ) ); // top right
 525
 526             // Back (same as front for the moment)
 527             t->push_back( osg::Vec2( right_x, base_y) ); // bottom right
 528             t->push_back( osg::Vec2( left_x,  base_y) ); // bottom left
 529             t->push_back( osg::Vec2( left_x,  top_y ) ); // top left
 530             t->push_back( osg::Vec2( right_x, top_y ) ); // top right
 531
 532             // Right (same as left for the moment)
 533             t->push_back( osg::Vec2( right_x, base_y) ); // bottom right
 534             t->push_back( osg::Vec2( left_x,  base_y) ); // bottom left
 535             t->push_back( osg::Vec2( left_x,  top_y ) ); // top left
 536             t->push_back( osg::Vec2( right_x, top_y ) ); // top right
 537           } else {
 538             // Flat roof
 539             base_y = 416/1024.0;
 540             top_y = 576.0/1024.0;
 541             left_x = column * 192.0 /1024.0;
 542             right_x = (column + 1)* 192.0 /1024.0;
 543
 544             // Flat roofs still have 4 surfaces
 545             for (int i=0; i<4; ++i) {
 546               t->push_back( osg::Vec2( right_x, base_y) ); // bottom right
 547               t->push_back( osg::Vec2( left_x,  base_y) ); // bottom left
 548               t->push_back( osg::Vec2( left_x,  top_y ) ); // top left
 549               t->push_back( osg::Vec2( right_x, top_y ) ); // top right
 550             }
 551           }
 552         }
 553
 554         if (building.type == SGBuildingBin::LARGE)
 555         {
 556           int column = ((int) (mt_rand(&seed) * 1000)) % 8;
 557           float base_y = 576 / 1024.0;
 558           float top_y = base_y + 16.0 * (float) building.floors / 1024.0;
 559           float left_x = column * 128.0 /1024.0 + 32.0 / 1024.0 * round((float) building.width / 20.0f);
 560           float right_x = column * 128.0 /1024.0;
 561
 562           // BASEMENT - uses the baseline texture
 563           for (unsigned int i = 0; i < 16; i++) {
 564             t->push_back( osg::Vec2( left_x, base_y) );
 565           }
 566
 567           // MAIN BODY
 568           // Front
 569           t->push_back( osg::Vec2( right_x, base_y) ); // bottom right
 570           t->push_back( osg::Vec2( left_x,  base_y) ); // bottom left
 571           t->push_back( osg::Vec2( left_x,  top_y ) ); // top left
 572           t->push_back( osg::Vec2( right_x, top_y ) ); // top right
 573
 574           // Left
 575           t->push_back( osg::Vec2( right_x, base_y) ); // bottom right
 576           t->push_back( osg::Vec2( left_x,  base_y) ); // bottom left
 577           t->push_back( osg::Vec2( left_x,  top_y ) ); // top left
 578           t->push_back( osg::Vec2( right_x, top_y ) ); // top right
 579
 580           // Back (same as front for the moment)
 581           t->push_back( osg::Vec2( right_x, base_y) ); // bottom right
 582           t->push_back( osg::Vec2( left_x,  base_y) ); // bottom left
 583           t->push_back( osg::Vec2( left_x,  top_y ) ); // top left
 584           t->push_back( osg::Vec2( right_x, top_y ) ); // top right
 585
 586           // Right (same as left for the moment)
 587           t->push_back( osg::Vec2( right_x, base_y) ); // bottom right
 588           t->push_back( osg::Vec2( left_x,  base_y) ); // bottom left
 589           t->push_back( osg::Vec2( left_x,  top_y ) ); // top left
 590           t->push_back( osg::Vec2( right_x, top_y ) ); // top right
 591
 592           // ROOF
 593           if (building.pitched) {
 594             base_y = 896/1024.0;
 595             top_y = 1.0;
 596             // Front
 597             t->push_back( osg::Vec2( right_x, base_y) ); // bottom right
 598             t->push_back( osg::Vec2( left_x,  base_y) ); // bottom left
 599             t->push_back( osg::Vec2( left_x,  top_y ) ); // top left
 600             t->push_back( osg::Vec2( right_x, top_y ) ); // top right
 601
 602             // Left
 603             t->push_back( osg::Vec2( right_x, base_y) ); // bottom right
 604             t->push_back( osg::Vec2( left_x,  base_y) ); // bottom left
 605             t->push_back( osg::Vec2( left_x,  top_y ) ); // top left
 606             t->push_back( osg::Vec2( right_x, top_y ) ); // top right
 607
 608             // Back (same as front for the moment)
 609             t->push_back( osg::Vec2( right_x, base_y) ); // bottom right
 610             t->push_back( osg::Vec2( left_x,  base_y) ); // bottom left
 611             t->push_back( osg::Vec2( left_x,  top_y ) ); // top left
 612             t->push_back( osg::Vec2( right_x, top_y ) ); // top right
 613
 614             // Right (same as left for the moment)
 615             t->push_back( osg::Vec2( right_x, base_y) ); // bottom right
 616             t->push_back( osg::Vec2( left_x,  base_y) ); // bottom left
 617             t->push_back( osg::Vec2( left_x,  top_y ) ); // top left
 618             t->push_back( osg::Vec2( right_x, top_y ) ); // top right
 619           } else {
 620             // Flat roof
 621             base_y = 896/1024.0;
 622             top_y = 1.0;
 623
 624             // Flat roofs still have 4 surfaces
 625             for (int i=0; i<4; ++i) {
 626               t->push_back( osg::Vec2( right_x, base_y) ); // bottom right
 627               t->push_back( osg::Vec2( left_x,  base_y) ); // bottom left
 628               t->push_back( osg::Vec2( left_x,  top_y ) ); // top left
 629               t->push_back( osg::Vec2( right_x, top_y ) ); // top right
 630             }
 631           }
 632         }
 633       }
 634
 635       // Set the vertex, texture and normals.  Colors will be set per-instance
 636       // later.
 637       sharedGeometry->setVertexArray(v);
 638       sharedGeometry->setTexCoordArray(0, t, Array::BIND_PER_VERTEX);
 639       sharedGeometry->setNormalArray(n, Array::BIND_PER_VERTEX);
 640     }
 641   }
 642
 643   void SGBuildingBin::insert(SGVec3f p, float r, BuildingType type) {
 644
 645     if (type == SGBuildingBin::SMALL) {
 646       smallBuildingLocations.push_back(BuildingInstance(p, r, &smallBuildings, smallSharedGeometry));
 647     }
 648
 649     if (type == SGBuildingBin::MEDIUM) {
 650       mediumBuildingLocations.push_back(BuildingInstance(p, r, &mediumBuildings, mediumSharedGeometry));
 651     }
 652
 653     if (type == SGBuildingBin::LARGE) {
 654       largeBuildingLocations.push_back(BuildingInstance(p, r, &largeBuildings, largeSharedGeometry));
 655     }
 656   }
 657
 658   int SGBuildingBin::getNumBuildings() {
 659     return smallBuildingLocations.size() + mediumBuildingLocations.size() + largeBuildingLocations.size();
 660   }
 661
 662   bool SGBuildingBin::checkMinDist (SGVec3f p, float radius) {
 663     BuildingInstanceList::iterator iter;
 664
 665     float r = (radius + smallBuildingMaxRadius) * (radius + smallBuildingMaxRadius);
 666     for (iter = smallBuildingLocations.begin(); iter != smallBuildingLocations.end(); ++iter) {
 667       if (iter->getDistSqr(p) < r) {
 668         return false;
 669       }
 670     }
 671
 672     r = (radius + mediumBuildingMaxRadius) * (radius + mediumBuildingMaxRadius);
 673     for (iter = mediumBuildingLocations.begin(); iter != mediumBuildingLocations.end(); ++iter) {
 674       if (iter->getDistSqr(p) < r) {
 675         return false;
 676       }
 677     }
 678
 679     r = (radius + largeBuildingMaxRadius) * (radius + largeBuildingMaxRadius);
 680     for (iter = largeBuildingLocations.begin(); iter != largeBuildingLocations.end(); ++iter) {
 681       if (iter->getDistSqr(p) < r) {
 682         return false;
 683       }
 684     }
 685
 686     return true;
 687   }
 688
 689   SGBuildingBin::BuildingType SGBuildingBin::getBuildingType(float roll) {
 690
 691     if (roll < smallBuildingFraction) {
 692       return SGBuildingBin::SMALL;
 693     }
 694
 695     if (roll < (smallBuildingFraction + mediumBuildingFraction)) {
 696       return SGBuildingBin::MEDIUM;
 697     }
 698
 699     return SGBuildingBin::LARGE;
 700   }
 701
 702   float SGBuildingBin::getBuildingMaxRadius(BuildingType type) {
 703
 704     if (type == SGBuildingBin::SMALL) return smallBuildingMaxRadius;
 705     if (type == SGBuildingBin::MEDIUM) return mediumBuildingMaxRadius;
 706     if (type == SGBuildingBin::LARGE) return largeBuildingMaxRadius;
 707
 708     return 0;
 709   }
 710
 711   float SGBuildingBin::getBuildingMaxDepth(BuildingType type) {
 712
 713     if (type == SGBuildingBin::SMALL) return smallBuildingMaxDepth;
 714     if (type == SGBuildingBin::MEDIUM) return mediumBuildingMaxDepth;
 715     if (type == SGBuildingBin::LARGE) return largeBuildingMaxDepth;
 716
 717     return 0;
 718   }
 719
 720   ref_ptr<Group> SGBuildingBin::createBuildingsGroup(Matrix transInv, const SGReaderWriterOptions* options)
 721   {
 722     ref_ptr<Effect> effect;
 723     EffectMap::iterator iter = buildingEffectMap.find(*texture);
 724
 725     if ((iter == buildingEffectMap.end())||
 726         (!iter->second.lock(effect)))
 727     {
 728       SGPropertyNode_ptr effectProp = new SGPropertyNode;
 729       makeChild(effectProp, "inherits-from")->setStringValue("Effects/building");
 730       SGPropertyNode* params = makeChild(effectProp, "parameters");
 731       // Main texture - n=0
 732       params->getChild("texture", 0, true)->getChild("image", 0, true)
 733           ->setStringValue(*texture);
 734
 735       // Light map - n=3
 736       params->getChild("texture", 3, true)->getChild("image", 0, true)
 737           ->setStringValue(*lightMap);
 738
 739       effect = makeEffect(effectProp, true, options);
 740       if (iter == buildingEffectMap.end())
 741           buildingEffectMap.insert(EffectMap::value_type(*texture, effect));
 742       else
 743           iter->second = effect; // update existing, but empty observer
 744     }
 745
 746     ref_ptr<Group> group = new osg::Group();
 747
 748     // Now, create a quadbuilding for the buildings.
 749
 750     BuildingInstanceList locs[] = { smallBuildingLocations,
 751                                     SGBuildingBin::mediumBuildingLocations,
 752                                     SGBuildingBin::largeBuildingLocations };
 753
 754     for (int i = 0; i < 3; i++)
 755     {
 756       // Create a quad tree.  Only small and medium buildings are faded out.
 757       BuildingGeometryQuadtree
 758           quadbuilding(GetBuildingCoord(), AddBuildingLeafObject(),
 759                    SG_BUILDING_QUAD_TREE_DEPTH,
 760                    MakeBuildingLeaf(buildingRange, effect, (i != 2)));
 761
 762       // Transform building positions from the "geocentric" positions we
 763       // get from the scenery polys into the local Z-up coordinate
 764       // system.
 765       std::vector<BuildingInstance> rotatedBuildings;
 766       rotatedBuildings.reserve(locs[i].size());
 767       std::transform(locs[i].begin(), locs[i].end(),
 768                      std::back_inserter(rotatedBuildings),
 769                      BuildingInstanceTransformer(transInv));
 770       quadbuilding.buildQuadTree(rotatedBuildings.begin(), rotatedBuildings.end());
 771
 772       for (size_t j = 0; j < quadbuilding.getRoot()->getNumChildren(); ++j)
 773               group->addChild(quadbuilding.getRoot()->getChild(j));
 774     }
 775
 776     return group;
 777   }
 778
 779   // We may end up with a quadtree with many empty leaves. One might say
 780   // that we should avoid constructing the leaves in the first place,
 781   // but this node visitor tries to clean up after the fact.
 782   struct QuadTreeCleaner : public osg::NodeVisitor
 783   {
 784       QuadTreeCleaner() : NodeVisitor(NodeVisitor::TRAVERSE_ALL_CHILDREN)
 785       {
 786       }
 787       void apply(LOD& lod)
 788       {
 789           for (int i  = lod.getNumChildren() - 1; i >= 0; --i) {
 790               EffectGeode* geode = dynamic_cast<EffectGeode*>(lod.getChild(i));
 791               if (!geode)
 792                   continue;
 793               bool geodeEmpty = true;
 794               if (geode->getNumDrawables() > 1) {
 795                 SG_LOG(SG_TERRAIN, SG_DEBUG, "Building LOD Drawables: " << geode->getNumDrawables());
 796               }
 797
 798               for (unsigned j = 0; j < geode->getNumDrawables(); ++j) {
 799                   const Geometry* geom = dynamic_cast<Geometry*>(geode->getDrawable(j));
 800                   if (!geom) {
 801                       geodeEmpty = false;
 802                       break;
 803                   }
 804                   for (unsigned k = 0; k < geom->getNumPrimitiveSets(); k++) {
 805                       const PrimitiveSet* ps = geom->getPrimitiveSet(k);
 806                       if (ps->getNumIndices() > 0) {
 807                           geodeEmpty = false;
 808                           break;
 809                       }
 810                   }
 811               }
 812               if (geodeEmpty)
 813                   lod.removeChildren(i, 1);
 814           }
 815       }
 816   };
 817
 818   // This actually returns a MatrixTransform node. If we rotate the whole
 819   // forest into the local Z-up coordinate system we can reuse the
 820   // primitive building geometry for all the forests of the same type.
 821   osg::Group* createRandomBuildings(SGBuildingBinList& buildings, const osg::Matrix& transform,
 822                            const SGReaderWriterOptions* options)
 823   {
 824       Matrix transInv = Matrix::inverse(transform);
 825       static Matrix ident;
 826       // Set up some shared structures.
 827       MatrixTransform* mt = new MatrixTransform(transform);
 828       SGBuildingBinList::iterator i;
 829
 830       for (i = buildings.begin(); i != buildings.end(); ++i) {
 831           SGBuildingBin* bin = *i;
 832           ref_ptr<Group> group = bin->createBuildingsGroup(transInv, options);
 833
 834           for (size_t j = 0; j < group->getNumChildren(); ++j) {
 835             mt->addChild(group->getChild(j));
 836           }
 837
 838           delete bin;
 839       }
 840
 841       buildings.clear();
 842
 843       QuadTreeCleaner cleaner;
 844       mt->accept(cleaner);
 845       return mt;
 846   }
 847 }