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