simgear/scene/material/mat.cxx

   1 // mat.cxx -- class to handle material properties
   2 //
   3 // Written by Curtis Olson, started May 1998.
   4 //
   5 // Copyright (C) 1998 - 2000  Curtis L. Olson  - http://www.flightgear.org/~curt
   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 // $Id$
  22
  23
  24 #ifdef HAVE_CONFIG_H
  25 #  include <simgear_config.h>
  26 #endif
  27
  28 #include <simgear/compiler.h>
  29
  30 #include <string.h>
  31 #include <map>
  32 #include <vector>
  33 #include <string>
  34
  35 #include <boost/foreach.hpp>
  36 #include "mat.hxx"
  37
  38 #include <osg/CullFace>
  39 #include <osg/Material>
  40 #include <osg/ShadeModel>
  41 #include <osg/StateSet>
  42 #include <osg/TexEnv>
  43 #include <osg/Texture>
  44 #include <osg/Texture2D>
  45 #include <osgDB/ReaderWriter>
  46 #include <osgDB/ReadFile>
  47 #include <osgDB/Registry>
  48 #include <osgDB/FileUtils>
  49
  50 #include <simgear/debug/logstream.hxx>
  51 #include <simgear/misc/sg_path.hxx>
  52 #include <simgear/misc/sgstream.hxx>
  53 #include <simgear/threads/SGGuard.hxx>
  54
  55 #include <simgear/scene/util/SGReaderWriterOptions.hxx>
  56 #include <simgear/props/props_io.hxx>
  57 #include <simgear/props/vectorPropTemplates.hxx>
  58 #include <simgear/scene/model/model.hxx>
  59 #include <simgear/scene/material/matmodel.hxx>
  60 #include <simgear/scene/util/RenderConstants.hxx>
  61 #include <simgear/scene/util/StateAttributeFactory.hxx>
  62 #include <simgear/props/condition.hxx>
  63 #include <simgear/scene/util/SGSceneFeatures.hxx>
  64 #include <simgear/scene/tgdb/SGTexturedTriangleBin.hxx>
  65
  66 #include "Effect.hxx"
  67 #include "Technique.hxx"
  68 #include "Pass.hxx"
  69
  70 using std::map;
  71 using namespace simgear;
  72
  73 ////////////////////////////////////////////////////////////////////////
  74 // Constructors and destructor.
  75 ////////////////////////////////////////////////////////////////////////
  76
  77 SGMaterial::_internal_state::_internal_state(Effect *e, bool l,
  78                                              const SGReaderWriterOptions* o)
  79     : effect(e), effect_realized(l), options(o)
  80 {
  81 }
  82
  83 SGMaterial::_internal_state::_internal_state( Effect *e,
  84                                               const std::string &t,
  85                                               bool l,
  86                                               const SGReaderWriterOptions* o )
  87     : effect(e), effect_realized(l), options(o)
  88 {
  89     texture_paths.push_back(std::make_pair(t,0));
  90 }
  91
  92 void SGMaterial::_internal_state::add_texture(const std::string &t, int i)
  93 {
  94     texture_paths.push_back(std::make_pair(t,i));
  95 }
  96
  97 SGMaterial::SGMaterial( const SGReaderWriterOptions* options,
  98                         const SGPropertyNode *props,
  99                         SGPropertyNode *prop_root,
 100                         AreaList *a,
 101                                                 SGSharedPtr<const SGCondition> c)
 102 {
 103     init();
 104     areas = a;
 105     condition = c;
 106     read_properties( options, props, prop_root );
 107     buildEffectProperties(options);
 108 }
 109
 110 SGMaterial::SGMaterial( const osgDB::Options* options,
 111                         const SGPropertyNode *props,
 112                         SGPropertyNode *prop_root,
 113                         AreaList *a,
 114                         SGSharedPtr<const SGCondition> c)
 115 {
 116     osg::ref_ptr<SGReaderWriterOptions> opt;
 117     opt = SGReaderWriterOptions::copyOrCreate(options);
 118     areas = a;
 119     condition = c;
 120     init();
 121     read_properties(opt.get(), props, prop_root);
 122     buildEffectProperties(opt.get());
 123 }
 124
 125 SGMaterial::~SGMaterial (void)
 126 {
 127 }
 128
 129 \f
 130 ////////////////////////////////////////////////////////////////////////
 131 // Public methods.
 132 ////////////////////////////////////////////////////////////////////////
 133
 134 void
 135 SGMaterial::read_properties(const SGReaderWriterOptions* options,
 136                             const SGPropertyNode *props,
 137                             SGPropertyNode *prop_root)
 138 {
 139     std::vector<bool> dds;
 140     std::vector<SGPropertyNode_ptr> textures = props->getChildren("texture");
 141     for (unsigned int i = 0; i < textures.size(); i++)
 142     {
 143         std::string tname = textures[i]->getStringValue();
 144
 145         if (tname.empty()) {
 146             tname = "unknown.rgb";
 147         }
 148
 149         SGPath tpath("Textures.high");
 150         tpath.append(tname);
 151         std::string fullTexPath = SGModelLib::findDataFile(tpath.str(), options);
 152         if (fullTexPath.empty()) {
 153             tpath.set("Textures");
 154             tpath.append(tname);
 155             fullTexPath = SGModelLib::findDataFile(tpath.str(), options);
 156             if (fullTexPath.empty()) {
 157                 SG_LOG(SG_GENERAL, SG_ALERT, "Cannot find texture \""
 158                         << tname << "\" in Textures or Textures.high folders.");
 159             }
 160         }
 161
 162         if (tpath.lower_extension() == "dds") {
 163             dds.push_back(true);
 164         } else {
 165             dds.push_back(false);
 166         }
 167
 168         if (!fullTexPath.empty() ) {
 169             _internal_state st( NULL, fullTexPath, false, options );
 170             _status.push_back( st );
 171         }
 172     }
 173
 174     std::vector<SGPropertyNode_ptr> texturesets = props->getChildren("texture-set");
 175     for (unsigned int i = 0; i < texturesets.size(); i++)
 176     {
 177         _internal_state st( NULL, false, options );
 178         std::vector<SGPropertyNode_ptr> textures = texturesets[i]->getChildren("texture");
 179         for (unsigned int j = 0; j < textures.size(); j++)
 180         {
 181             std::string tname = textures[j]->getStringValue();
 182             if (tname.empty()) {
 183                 tname = "unknown.rgb";
 184             }
 185
 186             SGPath tpath("Textures.high");
 187             tpath.append(tname);
 188             std::string fullTexPath = SGModelLib::findDataFile(tpath.str(), options);
 189             if (fullTexPath.empty()) {
 190                 tpath.set("Textures");
 191                 tpath.append(tname);
 192                 fullTexPath = SGModelLib::findDataFile(tpath.str(), options);
 193                 if (fullTexPath.empty() ) {
 194                     SG_LOG(SG_GENERAL, SG_ALERT, "Cannot find texture \""
 195                             << tname << "\" in Textures or Textures.high folders.");
 196                 }
 197             }
 198
 199             if (j == 0) {
 200                 if (tpath.lower_extension() == "dds") {
 201                     dds.push_back(true);
 202                 } else {
 203                     dds.push_back(false);
 204                 }
 205             }
 206
 207             st.add_texture(fullTexPath, textures[j]->getIndex());
 208         }
 209
 210         if (!st.texture_paths.empty() ) {
 211             _status.push_back( st );
 212         }
 213     }
 214
 215     if (textures.empty() && texturesets.empty()) {
 216         SGPath tpath("Textures");
 217         tpath.append("Terrain");
 218         tpath.append("unknown.rgb");
 219         _internal_state st( NULL, tpath.str(), true, options );
 220         _status.push_back( st );
 221     }
 222
 223     std::vector<SGPropertyNode_ptr> masks = props->getChildren("object-mask");
 224     for (unsigned int i = 0; i < masks.size(); i++)
 225     {
 226         std::string omname = masks[i]->getStringValue();
 227
 228         if (! omname.empty()) {
 229             SGPath ompath("Textures.high");
 230             ompath.append(omname);
 231             std::string fullMaskPath =
 232               SGModelLib::findDataFile(ompath.str(), options);
 233
 234             if (fullMaskPath.empty()) {
 235                 ompath.set("Textures");
 236                 ompath.append(omname);
 237                 fullMaskPath = SGModelLib::findDataFile(ompath.str(), options);
 238             }
 239
 240             if (fullMaskPath.empty()) {
 241                 SG_LOG(SG_GENERAL, SG_ALERT, "Cannot find texture \""
 242                         << omname << "\" in Textures or Textures.high folders.");
 243             }
 244             else
 245             {
 246                 osg::Image* image = osgDB::readImageFile(fullMaskPath, options);
 247                 if (image && image->valid())
 248                 {
 249                     Texture2DRef object_mask = new osg::Texture2D;
 250
 251                     bool dds_mask = (ompath.lower_extension() == "dds");
 252
 253                     if (i < dds.size() && dds[i] != dds_mask) {
 254                         // Texture format does not match mask format. This is relevant for
 255                         // the object mask, as DDS textures have an origin at the bottom
 256                         // left rather than top left. Therefore we flip a copy of the image
 257                         // (otherwise a second reference to the object mask would flip it
 258                         // back!).
 259                         SG_LOG(SG_GENERAL, SG_DEBUG, "Flipping object mask" << omname);
 260                         image = (osg::Image* ) image->clone(osg::CopyOp::SHALLOW_COPY);
 261                         image->flipVertical();
 262                     }
 263
 264                     object_mask->setImage(image);
 265
 266                     // We force the filtering to be nearest, as the red channel (rotation)
 267                     // in particular, doesn't make sense to be interpolated between pixels.
 268                     object_mask->setFilter(osg::Texture::MIN_FILTER, osg::Texture::NEAREST);
 269                     object_mask->setFilter(osg::Texture::MAG_FILTER, osg::Texture::NEAREST);
 270
 271                     object_mask->setDataVariance(osg::Object::STATIC);
 272                     object_mask->setWrap(osg::Texture::WRAP_S, osg::Texture::REPEAT);
 273                     object_mask->setWrap(osg::Texture::WRAP_T, osg::Texture::REPEAT);
 274                     _masks.push_back(object_mask);
 275                 }
 276             }
 277         }
 278     }
 279
 280     xsize = props->getDoubleValue("xsize", 0.0);
 281     ysize = props->getDoubleValue("ysize", 0.0);
 282     wrapu = props->getBoolValue("wrapu", true);
 283     wrapv = props->getBoolValue("wrapv", true);
 284     mipmap = props->getBoolValue("mipmap", true);
 285     light_coverage = props->getDoubleValue("light-coverage", 0.0);
 286
 287     // Building properties
 288     building_coverage = props->getDoubleValue("building-coverage", 0.0);
 289     building_spacing = props->getDoubleValue("building-spacing-m", 5.0);
 290
 291     std::string bt = props->getStringValue( "building-texture",
 292                                             "Textures/buildings.png" );
 293     building_texture = SGModelLib::findDataFile(bt, options);
 294
 295     if (building_texture.empty()) {
 296         SG_LOG(SG_GENERAL, SG_ALERT, "Cannot find texture \"" << bt);
 297     }
 298
 299     bt = props->getStringValue("building-lightmap", "Textures/buildings-lightmap.png");
 300     building_lightmap = SGModelLib::findDataFile(bt, options);
 301
 302     if (building_lightmap.empty()) {
 303         SG_LOG(SG_GENERAL, SG_ALERT, "Cannot find texture \"" << bt);
 304     }
 305
 306     building_small_ratio = props->getDoubleValue("building-small-ratio", 0.8);
 307     building_medium_ratio = props->getDoubleValue("building-medium-ratio", 0.15);
 308     building_large_ratio =  props->getDoubleValue("building-large-ratio", 0.05);
 309
 310     building_small_pitch =  props->getDoubleValue("building-small-pitch", 0.8);
 311     building_medium_pitch =  props->getDoubleValue("building-medium-pitch", 0.2);
 312     building_large_pitch =  props->getDoubleValue("building-large-pitch", 0.1);
 313
 314     building_small_min_floors = props->getIntValue("building-small-min-floors", 1);
 315     building_small_max_floors = props->getIntValue("building-small-max-floors", 3);
 316     building_medium_min_floors = props->getIntValue("building-medium-min-floors", 3);
 317     building_medium_max_floors = props->getIntValue("building-medium-max-floors", 8);
 318     building_large_min_floors = props->getIntValue("building-large-min-floors", 5);
 319     building_large_max_floors = props->getIntValue("building-large-max-floors", 20);
 320
 321     building_small_min_width = props->getFloatValue("building-small-min-width-m", 15.0);
 322     building_small_max_width = props->getFloatValue("building-small-max-width-m", 60.0);
 323     building_small_min_depth = props->getFloatValue("building-small-min-depth-m", 10.0);
 324     building_small_max_depth = props->getFloatValue("building-small-max-depth-m", 20.0);
 325
 326     building_medium_min_width = props->getFloatValue("building-medium-min-width-m", 25.0);
 327     building_medium_max_width = props->getFloatValue("building-medium-max-width-m", 50.0);
 328     building_medium_min_depth = props->getFloatValue("building-medium-min-depth-m", 20.0);
 329     building_medium_max_depth = props->getFloatValue("building-medium-max-depth-m", 50.0);
 330
 331     building_large_min_width = props->getFloatValue("building-large-min-width-m", 50.0);
 332     building_large_max_width = props->getFloatValue("building-large-max-width-m", 75.0);
 333     building_large_min_depth = props->getFloatValue("building-large-min-depth-m", 50.0);
 334     building_large_max_depth = props->getFloatValue("building-large-max-depth-m", 75.0);
 335
 336     building_range = props->getDoubleValue("building-range-m", 10000.0);
 337
 338     cos_object_max_density_slope_angle  = cos(props->getFloatValue("object-max-density-angle-deg", 20.0) * osg::PI/180.0);
 339     cos_object_zero_density_slope_angle = cos(props->getFloatValue("object-zero-density-angle-deg", 30.0) * osg::PI/180.0);
 340
 341     // Random vegetation properties
 342     wood_coverage = props->getDoubleValue("wood-coverage", 0.0);
 343     tree_height = props->getDoubleValue("tree-height-m", 0.0);
 344     tree_width = props->getDoubleValue("tree-width-m", 0.0);
 345     tree_range = props->getDoubleValue("tree-range-m", 0.0);
 346     tree_varieties = props->getIntValue("tree-varieties", 1);
 347     cos_tree_max_density_slope_angle  = cos(props->getFloatValue("tree-max-density-angle-deg", 30.0) * osg::PI/180.0);
 348     cos_tree_zero_density_slope_angle = cos(props->getFloatValue("tree-zero-density-angle-deg", 45.0) * osg::PI/180.0);
 349
 350     const SGPropertyNode* treeTexNode = props->getChild("tree-texture");
 351
 352     if (treeTexNode) {
 353         std::string treeTexPath = props->getStringValue("tree-texture");
 354
 355         if (! treeTexPath.empty()) {
 356             SGPath treePath("Textures.high");
 357             treePath.append(treeTexPath);
 358             tree_texture = SGModelLib::findDataFile(treePath.str(), options);
 359
 360             if (tree_texture.empty()) {
 361                 treePath.set("Textures");
 362                 treePath.append(treeTexPath);
 363                 tree_texture = SGModelLib::findDataFile(treePath.str(), options);
 364             }
 365         }
 366     }
 367
 368     // surface values for use with ground reactions
 369     _solid = props->getBoolValue("solid", _solid);
 370     _friction_factor = props->getDoubleValue("friction-factor", _friction_factor);
 371     _rolling_friction = props->getDoubleValue("rolling-friction", _rolling_friction);
 372     _bumpiness = props->getDoubleValue("bumpiness", _bumpiness);
 373     _load_resistance = props->getDoubleValue("load-resistance", _load_resistance);
 374
 375     // Taken from default values as used in ac3d
 376     ambient[0] = props->getDoubleValue("ambient/r", 0.2);
 377     ambient[1] = props->getDoubleValue("ambient/g", 0.2);
 378     ambient[2] = props->getDoubleValue("ambient/b", 0.2);
 379     ambient[3] = props->getDoubleValue("ambient/a", 1.0);
 380
 381     diffuse[0] = props->getDoubleValue("diffuse/r", 0.8);
 382     diffuse[1] = props->getDoubleValue("diffuse/g", 0.8);
 383     diffuse[2] = props->getDoubleValue("diffuse/b", 0.8);
 384     diffuse[3] = props->getDoubleValue("diffuse/a", 1.0);
 385
 386     specular[0] = props->getDoubleValue("specular/r", 0.0);
 387     specular[1] = props->getDoubleValue("specular/g", 0.0);
 388     specular[2] = props->getDoubleValue("specular/b", 0.0);
 389     specular[3] = props->getDoubleValue("specular/a", 1.0);
 390
 391     emission[0] = props->getDoubleValue("emissive/r", 0.0);
 392     emission[1] = props->getDoubleValue("emissive/g", 0.0);
 393     emission[2] = props->getDoubleValue("emissive/b", 0.0);
 394     emission[3] = props->getDoubleValue("emissive/a", 1.0);
 395
 396     shininess = props->getDoubleValue("shininess", 1.0);
 397
 398     if (props->hasChild("effect"))
 399         effect = props->getStringValue("effect");
 400
 401     std::vector<SGPropertyNode_ptr> object_group_nodes =
 402             ((SGPropertyNode *)props)->getChildren("object-group");
 403     for (unsigned int i = 0; i < object_group_nodes.size(); i++)
 404         object_groups.push_back(new SGMatModelGroup(object_group_nodes[i]));
 405
 406     // read glyph table for taxi-/runway-signs
 407     std::vector<SGPropertyNode_ptr> glyph_nodes = props->getChildren("glyph");
 408     for (unsigned int i = 0; i < glyph_nodes.size(); i++) {
 409         const char *name = glyph_nodes[i]->getStringValue("name");
 410         if (name)
 411             glyphs[name] = new SGMaterialGlyph(glyph_nodes[i]);
 412     }
 413
 414     // Read parameters entry, which is passed into the effect
 415     if (props->hasChild("parameters")) {
 416         parameters = props->getChild("parameters");
 417     } else {
 418         parameters = new SGPropertyNode();
 419     }
 420 }
 421
 422
 423 \f
 424 ////////////////////////////////////////////////////////////////////////
 425 // Private methods.
 426 ////////////////////////////////////////////////////////////////////////
 427
 428 void
 429 SGMaterial::init ()
 430 {
 431     _status.clear();
 432     xsize = 0;
 433     ysize = 0;
 434     wrapu = true;
 435     wrapv = true;
 436
 437     mipmap = true;
 438     light_coverage = 0.0;
 439     building_coverage = 0.0;
 440
 441     shininess = 1.0;
 442     for (int i = 0; i < 4; i++) {
 443         ambient[i]  = (i < 3) ? 0.2 : 1.0;
 444         specular[i] = (i < 3) ? 0.0 : 1.0;
 445         diffuse[i]  = (i < 3) ? 0.8 : 1.0;
 446         emission[i] = (i < 3) ? 0.0 : 1.0;
 447     }
 448     effect = "Effects/terrain-default";
 449 }
 450
 451 Effect* SGMaterial::get_effect(int i)
 452 {
 453     if(!_status[i].effect_realized) {
 454         if (!_status[i].effect.valid())
 455             return 0;
 456         _status[i].effect->realizeTechniques(_status[i].options.get());
 457         _status[i].effect_realized = true;
 458     }
 459     return _status[i].effect.get();
 460 }
 461
 462 Effect* SGMaterial::get_effect(const SGTexturedTriangleBin& triangleBin)
 463 {
 464     SGGuard<SGMutex> g(_lock);
 465     if (_status.empty()) {
 466         SG_LOG( SG_GENERAL, SG_WARN, "No effect available.");
 467         return 0;
 468     }
 469
 470     int i = triangleBin.getTextureIndex() % _status.size();
 471     return get_effect(i);
 472 }
 473
 474 Effect* SGMaterial::get_effect()
 475 {
 476     SGGuard<SGMutex> g(_lock);
 477     return get_effect(0);
 478 }
 479
 480
 481 osg::Texture2D* SGMaterial::get_object_mask(const SGTexturedTriangleBin& triangleBin)
 482 {
 483     if (_status.empty()) {
 484         SG_LOG( SG_GENERAL, SG_WARN, "No mask available.");
 485         return 0;
 486     }
 487
 488     // Note that the object mask is closely linked to the texture/effect
 489     // so we index based on the texture index,
 490     unsigned int i = triangleBin.getTextureIndex() % _status.size();
 491     if (i < _masks.size()) {
 492         return _masks[i].get();
 493     } else {
 494         return 0;
 495     }
 496 }
 497
 498 void SGMaterial::buildEffectProperties(const SGReaderWriterOptions* options)
 499 {
 500     using namespace osg;
 501     ref_ptr<SGMaterialUserData> user = new SGMaterialUserData(this);
 502     SGPropertyNode_ptr propRoot = new SGPropertyNode();
 503     makeChild(propRoot, "inherits-from")->setStringValue(effect);
 504
 505     SGPropertyNode* paramProp = makeChild(propRoot, "parameters");
 506     copyProperties(parameters, paramProp);
 507
 508     SGPropertyNode* materialProp = makeChild(paramProp, "material");
 509     makeChild(materialProp, "ambient")->setValue(SGVec4d(ambient));
 510     makeChild(materialProp, "diffuse")->setValue(SGVec4d(diffuse));
 511     makeChild(materialProp, "specular")->setValue(SGVec4d(specular));
 512     makeChild(materialProp, "emissive")->setValue(SGVec4d(emission));
 513     makeChild(materialProp, "shininess")->setFloatValue(shininess);
 514     if (ambient[3] < 1 || diffuse[3] < 1 ||
 515         specular[3] < 1 || emission[3] < 1) {
 516         makeChild(paramProp, "transparent")->setBoolValue(true);
 517         SGPropertyNode* binProp = makeChild(paramProp, "render-bin");
 518         makeChild(binProp, "bin-number")->setIntValue(TRANSPARENT_BIN);
 519         makeChild(binProp, "bin-name")->setStringValue("DepthSortedBin");
 520     }
 521     BOOST_FOREACH(_internal_state& matState, _status)
 522     {
 523         SGPropertyNode_ptr effectProp = new SGPropertyNode();
 524         copyProperties(propRoot, effectProp);
 525         SGPropertyNode* effectParamProp = effectProp->getChild("parameters", 0);
 526         for (unsigned int i = 0; i < matState.texture_paths.size(); i++) {
 527             SGPropertyNode* texProp = makeChild(effectParamProp, "texture", matState.texture_paths[i].second);
 528             makeChild(texProp, "image")->setStringValue(matState.texture_paths[i].first);
 529             makeChild(texProp, "filter")
 530                 ->setStringValue(mipmap ? "linear-mipmap-linear" : "nearest");
 531             makeChild(texProp, "wrap-s")
 532                 ->setStringValue(wrapu ? "repeat" : "clamp-to-edge");
 533             makeChild(texProp, "wrap-t")
 534                 ->setStringValue(wrapv ? "repeat" : "clamp-to-edge");
 535         }
 536         makeChild(effectParamProp, "xsize")->setDoubleValue(xsize);
 537         makeChild(effectParamProp, "ysize")->setDoubleValue(ysize);
 538         makeChild(effectParamProp, "scale")->setValue(SGVec3d(xsize,ysize,0.0));
 539         makeChild(effectParamProp, "light-coverage")->setDoubleValue(light_coverage);
 540
 541         matState.effect = makeEffect(effectProp, false, options);
 542         if (matState.effect.valid())
 543             matState.effect->setUserData(user.get());
 544     }
 545 }
 546
 547 SGMaterialGlyph* SGMaterial::get_glyph (const std::string& name) const
 548 {
 549     map<std::string, SGSharedPtr<SGMaterialGlyph> >::const_iterator it;
 550     it = glyphs.find(name);
 551     if (it == glyphs.end())
 552         return 0;
 553
 554     return it->second;
 555 }
 556
 557 bool SGMaterial::valid(SGVec2f loc) const
 558 {
 559         SG_LOG( SG_TERRAIN, SG_BULK, "Checking materials for location ("
 560                         << loc.x() << ","
 561                         << loc.y() << ")");
 562
 563         // Check location first again the areas the material is valid for
 564         AreaList::const_iterator i = areas->begin();
 565
 566         if (i == areas->end()) {
 567                 // No areas defined, so simply check against condition
 568                 if (condition) {
 569                         return condition->test();
 570                 } else {
 571                         return true;
 572                 }
 573         }
 574
 575         for (; i != areas->end(); i++) {
 576
 577                 SG_LOG( SG_TERRAIN, SG_BULK, "Checking area ("
 578                                 << i->x() << ","
 579                                 << i->y() << ") width:"
 580                                 << i->width() << " height:"
 581                                 << i->height());
 582                 // Areas defined, so check that the tile location falls within it
 583                 // before checking against condition
 584                 if (i->contains(loc.x(), loc.y())) {
 585                         if (condition) {
 586                                 return condition->test();
 587                         } else {
 588                                 return true;
 589                         }
 590                 }
 591         }
 592
 593         return false;
 594 }
 595
 596 \f
 597 ////////////////////////////////////////////////////////////////////////
 598 // SGMaterialGlyph.
 599 ////////////////////////////////////////////////////////////////////////
 600
 601 SGMaterialGlyph::SGMaterialGlyph(SGPropertyNode *p) :
 602     _left(p->getDoubleValue("left", 0.0)),
 603     _right(p->getDoubleValue("right", 1.0))
 604 {
 605 }
 606
 607 void
 608 SGSetTextureFilter( int max) {
 609     SGSceneFeatures::instance()->setTextureFilter( max);
 610 }
 611
 612 int
 613 SGGetTextureFilter() {
 614     return SGSceneFeatures::instance()->getTextureFilter();
 615 }