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