simgear/scene/material/TextureBuilder.cxx

   1 // Copyright (C) 2009  Tim Moore timoore@redhat.com
   2 //
   3 // This library is free software; you can redistribute it and/or
   4 // modify it under the terms of the GNU Library General Public
   5 // License as published by the Free Software Foundation; either
   6 // version 2 of the License, or (at your option) any later version.
   7 //
   8 // This library is distributed in the hope that it will be useful,
   9 // but WITHOUT ANY WARRANTY; without even the implied warranty of
  10 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  11 // Library General Public License for more details.
  12 //
  13 // You should have received a copy of the GNU General Public License
  14 // along with this program; if not, write to the Free Software
  15 // Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
  16
  17 #ifdef HAVE_CONFIG_H
  18 #  include <simgear_config.h>
  19 #endif
  20
  21 #include "TextureBuilder.hxx"
  22
  23 #include "Pass.hxx"
  24
  25 #include <osg/TexEnv>
  26 #include <osg/TexEnvCombine>
  27 #include <osg/TexGen>
  28 #include <osg/Texture1D>
  29 #include <osg/Texture2D>
  30 #include <osg/Texture3D>
  31 #include <osg/TextureRectangle>
  32 #include <osg/TextureCubeMap>
  33 #include <osgDB/FileUtils>
  34
  35 #include <boost/lexical_cast.hpp>
  36 #include <boost/tuple/tuple.hpp>
  37 #include <boost/tuple/tuple_comparison.hpp>
  38
  39 #include <simgear/scene/model/SGReaderWriterXMLOptions.hxx>
  40 #include <simgear/scene/util/SGSceneFeatures.hxx>
  41 #include <simgear/scene/util/StateAttributeFactory.hxx>
  42 #include <simgear/math/SGMath.hxx>
  43 #include <simgear/structure/OSGUtils.hxx>
  44
  45 #include "Noise.hxx"
  46
  47 namespace simgear
  48 {
  49 using namespace std;
  50 using namespace osg;
  51
  52 using namespace effect;
  53
  54 TexEnvCombine* buildTexEnvCombine(Effect* effect,
  55                                   const SGPropertyNode* envProp,
  56                                   const SGReaderWriterXMLOptions* options);
  57 TexGen* buildTexGen(Effect* Effect, const SGPropertyNode* tgenProp);
  58
  59 // Hack to force inclusion of TextureBuilder.cxx in library
  60 osg::Texture* TextureBuilder::buildFromType(Effect* effect, const string& type,
  61                                             const SGPropertyNode*props,
  62                                             const SGReaderWriterXMLOptions*
  63                                             options)
  64 {
  65     return EffectBuilder<Texture>::buildFromType(effect, type, props, options);
  66 }
  67
  68 typedef boost::tuple<string, Texture::FilterMode, Texture::FilterMode,
  69                      Texture::WrapMode, Texture::WrapMode, Texture::WrapMode,
  70                      string> TexTuple;
  71
  72 EffectNameValue<TexEnv::Mode> texEnvModesInit[] =
  73 {
  74     {"add", TexEnv::ADD},
  75     {"blend", TexEnv::BLEND},
  76     {"decal", TexEnv::DECAL},
  77     {"modulate", TexEnv::MODULATE},
  78     {"replace", TexEnv::REPLACE}
  79 };
  80 EffectPropertyMap<TexEnv::Mode> texEnvModes(texEnvModesInit);
  81
  82 TexEnv* buildTexEnv(Effect* effect, const SGPropertyNode* prop)
  83 {
  84     const SGPropertyNode* modeProp = getEffectPropertyChild(effect, prop,
  85                                                             "mode");
  86     const SGPropertyNode* colorProp = getEffectPropertyChild(effect, prop,
  87                                                              "color");
  88     if (!modeProp)
  89         return 0;
  90     TexEnv::Mode mode = TexEnv::MODULATE;
  91     findAttr(texEnvModes, modeProp, mode);
  92     if (mode == TexEnv::MODULATE) {
  93         return StateAttributeFactory::instance()->getStandardTexEnv();
  94     }
  95     TexEnv* env = new TexEnv(mode);
  96     if (colorProp)
  97         env->setColor(toOsg(colorProp->getValue<SGVec4d>()));
  98     return env;
  99 }
 100
 101
 102 void TextureUnitBuilder::buildAttribute(Effect* effect, Pass* pass,
 103                                         const SGPropertyNode* prop,
 104                                         const SGReaderWriterXMLOptions* options)
 105 {
 106     if (!isAttributeActive(effect, prop))
 107         return;
 108     // Decode the texture unit
 109     int unit = 0;
 110     const SGPropertyNode* pUnit = prop->getChild("unit");
 111     if (pUnit) {
 112         unit = pUnit->getValue<int>();
 113     } else {
 114         const SGPropertyNode* pName = prop->getChild("name");
 115         if (pName)
 116             try {
 117                 unit = boost::lexical_cast<int>(pName->getStringValue());
 118             } catch (boost::bad_lexical_cast& lex) {
 119                 SG_LOG(SG_INPUT, SG_ALERT, "can't decode name as texture unit "
 120                        << lex.what());
 121             }
 122     }
 123     const SGPropertyNode* pType = getEffectPropertyChild(effect, prop, "type");
 124     string type;
 125     if (!pType)
 126         type = "2d";
 127     else
 128         type = pType->getStringValue();
 129     Texture* texture = 0;
 130     try {
 131         texture = TextureBuilder::buildFromType(effect, type, prop,
 132                                                 options);
 133     }
 134     catch (BuilderException& ) {
 135         SG_LOG(SG_INPUT, SG_ALERT, "No image file, "
 136             << "maybe the reader did not set the filename attribute, "
 137             << "using white on " << pass->getName());
 138         texture = StateAttributeFactory::instance()->getWhiteTexture();
 139     }
 140     pass->setTextureAttributeAndModes(unit, texture);
 141     const SGPropertyNode* envProp = prop->getChild("environment");
 142     if (envProp) {
 143         TexEnv* env = buildTexEnv(effect, envProp);
 144         if (env)
 145             pass->setTextureAttributeAndModes(unit, env);
 146     }
 147     const SGPropertyNode* combineProp = prop->getChild("texenv-combine");
 148     TexEnvCombine* combiner = 0;
 149     if (combineProp && ((combiner = buildTexEnvCombine(effect, combineProp,
 150                                                        options))))
 151         pass->setTextureAttributeAndModes(unit, combiner);
 152     const SGPropertyNode* tgenProp = prop->getChild("texgen");
 153     TexGen* tgen = 0;
 154     if (tgenProp && (tgen = buildTexGen(effect, tgenProp)))
 155         pass->setTextureAttributeAndModes(unit, tgen);
 156 }
 157
 158 // InstallAttributeBuilder call is in Effect.cxx to force this file to
 159 // be linked in.
 160
 161 namespace
 162 {
 163 EffectNameValue<Texture::FilterMode> filterModesInit[] =
 164 {
 165     { "linear", Texture::LINEAR },
 166     { "linear-mipmap-linear", Texture::LINEAR_MIPMAP_LINEAR},
 167     { "linear-mipmap-nearest", Texture::LINEAR_MIPMAP_NEAREST},
 168     { "nearest", Texture::NEAREST},
 169     { "nearest-mipmap-linear", Texture::NEAREST_MIPMAP_LINEAR},
 170     { "nearest-mipmap-nearest", Texture::NEAREST_MIPMAP_NEAREST}
 171 };
 172 EffectPropertyMap<Texture::FilterMode> filterModes(filterModesInit);
 173
 174 EffectNameValue<Texture::WrapMode> wrapModesInit[] =
 175 {
 176     {"clamp", Texture::CLAMP},
 177     {"clamp-to-border", Texture::CLAMP_TO_BORDER},
 178     {"clamp-to-edge", Texture::CLAMP_TO_EDGE},
 179     {"mirror", Texture::MIRROR},
 180     {"repeat", Texture::REPEAT}
 181 };
 182 EffectPropertyMap<Texture::WrapMode> wrapModes(wrapModesInit);
 183
 184
 185 TexTuple makeTexTuple(Effect* effect, const SGPropertyNode* props,
 186                       const SGReaderWriterXMLOptions* options,
 187                       const string& texType)
 188 {
 189     Texture::FilterMode minFilter = Texture::LINEAR_MIPMAP_LINEAR;
 190     const SGPropertyNode* ep = 0;
 191     if ((ep = getEffectPropertyChild(effect, props, "filter")))
 192         findAttr(filterModes, ep, minFilter);
 193     Texture::FilterMode magFilter = Texture::LINEAR;
 194     if ((ep = getEffectPropertyChild(effect, props, "mag-filter")))
 195         findAttr(filterModes, ep, magFilter);
 196     const SGPropertyNode* pWrapS
 197         = getEffectPropertyChild(effect, props, "wrap-s");
 198     Texture::WrapMode sWrap = Texture::CLAMP;
 199     if (pWrapS)
 200         findAttr(wrapModes, pWrapS, sWrap);
 201     const SGPropertyNode* pWrapT
 202         = getEffectPropertyChild(effect, props, "wrap-t");
 203     Texture::WrapMode tWrap = Texture::CLAMP;
 204     if (pWrapT)
 205         findAttr(wrapModes, pWrapT, tWrap);
 206     const SGPropertyNode* pWrapR
 207         = getEffectPropertyChild(effect, props, "wrap-r");
 208     Texture::WrapMode rWrap = Texture::CLAMP;
 209     if (pWrapR)
 210         findAttr(wrapModes, pWrapR, rWrap);
 211     const SGPropertyNode* pImage
 212         = getEffectPropertyChild(effect, props, "image");
 213     string imageName;
 214     if (pImage)
 215         imageName = pImage->getStringValue();
 216     string absFileName = osgDB::findDataFile(imageName, options);
 217     return TexTuple(absFileName, minFilter, magFilter, sWrap, tWrap, rWrap,
 218                     texType);
 219 }
 220
 221 void setAttrs(const TexTuple& attrs, Texture* tex,
 222               const SGReaderWriterXMLOptions* options)
 223 {
 224     const string& imageName = attrs.get<0>();
 225     if (imageName.empty()) {
 226         throw BuilderException("no image file");
 227     } else {
 228         osgDB::ReaderWriter::ReadResult result
 229             = osgDB::Registry::instance()->readImage(imageName, options);
 230         if (result.success()) {
 231             osg::Image* image = result.getImage();
 232             tex->setImage(GL_FRONT_AND_BACK, image);
 233             int s = image->s();
 234             int t = image->t();
 235             if (s <= t && 32 <= s) {
 236                 SGSceneFeatures::instance()->setTextureCompression(tex);
 237             } else if (t < s && 32 <= t) {
 238                 SGSceneFeatures::instance()->setTextureCompression(tex);
 239             }
 240             tex->setMaxAnisotropy(SGSceneFeatures::instance()
 241                                   ->getTextureFilter());
 242         } else {
 243             SG_LOG(SG_INPUT, SG_ALERT, "failed to load effect texture file "
 244                    << imageName);
 245         }
 246     }
 247     // texture->setDataVariance(osg::Object::STATIC);
 248     tex->setFilter(Texture::MIN_FILTER, attrs.get<1>());
 249     tex->setFilter(Texture::MAG_FILTER, attrs.get<2>());
 250     tex->setWrap(Texture::WRAP_S, attrs.get<3>());
 251     tex->setWrap(Texture::WRAP_T, attrs.get<4>());
 252     tex->setWrap(Texture::WRAP_R, attrs.get<5>());
 253 }
 254 }
 255
 256 template<typename T>
 257 class TexBuilder : public TextureBuilder
 258 {
 259 public:
 260     TexBuilder(const string& texType) : _type(texType) {}
 261     Texture* build(Effect* effect, const SGPropertyNode*,
 262                    const SGReaderWriterXMLOptions* options);
 263 protected:
 264     typedef map<TexTuple, ref_ptr<T> > TexMap;
 265     TexMap texMap;
 266     const string _type;
 267 };
 268
 269 template<typename T>
 270 Texture* TexBuilder<T>::build(Effect* effect, const SGPropertyNode* props,
 271                               const SGReaderWriterXMLOptions* options)
 272 {
 273     TexTuple attrs = makeTexTuple(effect, props, options, _type);
 274     typename TexMap::iterator itr = texMap.find(attrs);
 275     if (itr != texMap.end())
 276         return itr->second.get();
 277     T* tex = new T;
 278     setAttrs(attrs, tex, options);
 279     texMap.insert(make_pair(attrs, tex));
 280     return tex;
 281 }
 282
 283
 284 namespace
 285 {
 286 TextureBuilder::Registrar install1D("1d", new TexBuilder<Texture1D>("1d"));
 287 TextureBuilder::Registrar install2D("2d", new TexBuilder<Texture2D>("2d"));
 288 TextureBuilder::Registrar install3D("3d", new TexBuilder<Texture3D>("3d"));
 289 }
 290
 291 class WhiteTextureBuilder : public TextureBuilder
 292 {
 293 public:
 294     Texture* build(Effect* effect, const SGPropertyNode*,
 295                    const SGReaderWriterXMLOptions* options);
 296 };
 297
 298 Texture* WhiteTextureBuilder::build(Effect* effect, const SGPropertyNode*,
 299                                     const SGReaderWriterXMLOptions* options)
 300 {
 301     return StateAttributeFactory::instance()->getWhiteTexture();
 302 }
 303
 304 namespace
 305 {
 306 TextureBuilder::Registrar installWhite("white", new WhiteTextureBuilder);
 307 }
 308
 309 class TransparentTextureBuilder : public TextureBuilder
 310 {
 311 public:
 312     Texture* build(Effect* effect, const SGPropertyNode*,
 313                    const SGReaderWriterXMLOptions* options);
 314 };
 315
 316 Texture* TransparentTextureBuilder::build(Effect* effect, const SGPropertyNode*,
 317                                     const SGReaderWriterXMLOptions* options)
 318 {
 319     return StateAttributeFactory::instance()->getTransparentTexture();
 320 }
 321
 322 namespace
 323 {
 324 TextureBuilder::Registrar installTransparent("transparent",
 325                                              new TransparentTextureBuilder);
 326 }
 327
 328 osg::Image* make3DNoiseImage(int texSize)
 329 {
 330     osg::Image* image = new osg::Image;
 331     image->setImage(texSize, texSize, texSize,
 332                     4, GL_RGBA, GL_UNSIGNED_BYTE,
 333                     new unsigned char[4 * texSize * texSize * texSize],
 334                     osg::Image::USE_NEW_DELETE);
 335
 336     const int startFrequency = 4;
 337     const int numOctaves = 4;
 338
 339     int f, i, j, k, inc;
 340     double ni[3];
 341     double inci, incj, inck;
 342     int frequency = startFrequency;
 343     GLubyte *ptr;
 344     double amp = 0.5;
 345
 346     osg::notify(osg::WARN) << "creating 3D noise texture... ";
 347
 348     for (f = 0, inc = 0; f < numOctaves; ++f, frequency *= 2, ++inc, amp *= 0.5)
 349     {
 350         SetNoiseFrequency(frequency);
 351         ptr = image->data();
 352         ni[0] = ni[1] = ni[2] = 0;
 353
 354         inci = 1.0 / (texSize / frequency);
 355         for (i = 0; i < texSize; ++i, ni[0] += inci)
 356         {
 357             incj = 1.0 / (texSize / frequency);
 358             for (j = 0; j < texSize; ++j, ni[1] += incj)
 359             {
 360                 inck = 1.0 / (texSize / frequency);
 361                 for (k = 0; k < texSize; ++k, ni[2] += inck, ptr += 4)
 362                 {
 363                     *(ptr+inc) = (GLubyte) (((noise3(ni) + 1.0) * amp) * 128.0);
 364                 }
 365             }
 366         }
 367     }
 368
 369     osg::notify(osg::WARN) << "DONE" << std::endl;
 370     return image;
 371 }
 372
 373 class NoiseBuilder : public TextureBuilder
 374 {
 375 public:
 376     Texture* build(Effect* effect, const SGPropertyNode*,
 377                    const SGReaderWriterXMLOptions* options);
 378 protected:
 379     typedef map<int, ref_ptr<Texture3D> > NoiseMap;
 380     NoiseMap _noises;
 381 };
 382
 383 Texture* NoiseBuilder::build(Effect* effect, const SGPropertyNode* props,
 384                              const SGReaderWriterXMLOptions* options)
 385 {
 386     int texSize = 64;
 387     const SGPropertyNode* sizeProp = getEffectPropertyChild(effect, props,
 388                                                             "size");
 389     if (sizeProp)
 390         texSize = sizeProp->getValue<int>();
 391     NoiseMap::iterator itr = _noises.find(texSize);
 392     if (itr != _noises.end())
 393         return itr->second.get();
 394     Texture3D* noiseTexture = new osg::Texture3D;
 395     noiseTexture->setFilter(osg::Texture3D::MIN_FILTER, osg::Texture3D::LINEAR);
 396     noiseTexture->setFilter(osg::Texture3D::MAG_FILTER, osg::Texture3D::LINEAR);
 397     noiseTexture->setWrap(osg::Texture3D::WRAP_S, osg::Texture3D::REPEAT);
 398     noiseTexture->setWrap(osg::Texture3D::WRAP_T, osg::Texture3D::REPEAT);
 399     noiseTexture->setWrap(osg::Texture3D::WRAP_R, osg::Texture3D::REPEAT);
 400     noiseTexture->setImage( make3DNoiseImage(texSize) );
 401     _noises.insert(make_pair(texSize, noiseTexture));
 402     return noiseTexture;
 403 }
 404
 405 namespace
 406 {
 407 TextureBuilder::Registrar installNoise("noise", new NoiseBuilder);
 408 }
 409
 410
 411 // Image names for all sides
 412 typedef boost::tuple<string, string, string, string, string, string> CubeMapTuple;
 413
 414 CubeMapTuple makeCubeMapTuple(Effect* effect, const SGPropertyNode* props)
 415 {
 416     const SGPropertyNode* ep = 0;
 417
 418     string positive_x;
 419     if ((ep = getEffectPropertyChild(effect, props, "positive-x")))
 420         positive_x = ep->getStringValue();
 421     string negative_x;
 422     if ((ep = getEffectPropertyChild(effect, props, "negative-x")))
 423         negative_x = ep->getStringValue();
 424     string positive_y;
 425     if ((ep = getEffectPropertyChild(effect, props, "positive-y")))
 426         positive_y = ep->getStringValue();
 427     string negative_y;
 428     if ((ep = getEffectPropertyChild(effect, props, "negative-y")))
 429         negative_y = ep->getStringValue();
 430     string positive_z;
 431     if ((ep = getEffectPropertyChild(effect, props, "positive-z")))
 432         positive_z = ep->getStringValue();
 433     string negative_z;
 434     if ((ep = getEffectPropertyChild(effect, props, "negative-z")))
 435         negative_z = ep->getStringValue();
 436     return CubeMapTuple(positive_x, negative_x, positive_y, negative_y, positive_z, negative_z);
 437 }
 438
 439
 440 class CubeMapBuilder : public TextureBuilder
 441 {
 442 public:
 443     Texture* build(Effect* effect, const SGPropertyNode*,
 444                    const SGReaderWriterXMLOptions* options);
 445 protected:
 446     typedef map<CubeMapTuple, ref_ptr<TextureCubeMap> > CubeMap;
 447     CubeMap _cubemaps;
 448 };
 449
 450 Texture* CubeMapBuilder::build(Effect* effect, const SGPropertyNode* props,
 451                              const SGReaderWriterXMLOptions* options)
 452 {
 453     // First check that there is a <images> tag
 454     const SGPropertyNode* texturesProp = getEffectPropertyChild(effect, props, "images");
 455     if (!texturesProp) {
 456         throw BuilderException("no <images> for cube map");
 457         return NULL; // This is redundant
 458     }
 459
 460     CubeMapTuple _tuple = makeCubeMapTuple(effect, texturesProp);
 461
 462     CubeMap::iterator itr = _cubemaps.find(_tuple);
 463     if (itr != _cubemaps.end())
 464         return itr->second.get();
 465
 466     TextureCubeMap* cubeTexture = new osg::TextureCubeMap;
 467
 468     // TODO: Read these from effect file? Maybe these are sane for all cuebmaps?
 469     cubeTexture->setFilter(osg::Texture3D::MIN_FILTER, osg::Texture::LINEAR_MIPMAP_LINEAR);
 470     cubeTexture->setFilter(osg::Texture3D::MAG_FILTER, osg::Texture::LINEAR);
 471     cubeTexture->setWrap(osg::Texture3D::WRAP_S, osg::Texture::CLAMP_TO_EDGE);
 472     cubeTexture->setWrap(osg::Texture3D::WRAP_T, osg::Texture::CLAMP_TO_EDGE);
 473     cubeTexture->setWrap(osg::Texture3D::WRAP_R, osg::Texture::CLAMP_TO_EDGE);
 474
 475     osgDB::ReaderWriter::ReadResult result =
 476                 osgDB::Registry::instance()->readImage(_tuple.get<0>(), options);
 477     if(result.success()) {
 478         osg::Image* image = result.getImage();
 479         cubeTexture->setImage(TextureCubeMap::POSITIVE_X, image);
 480     }
 481     result = osgDB::Registry::instance()->readImage(_tuple.get<1>(), options);
 482     if(result.success()) {
 483         osg::Image* image = result.getImage();
 484         cubeTexture->setImage(TextureCubeMap::NEGATIVE_X, image);
 485     }
 486     result = osgDB::Registry::instance()->readImage(_tuple.get<2>(), options);
 487     if(result.success()) {
 488         osg::Image* image = result.getImage();
 489         cubeTexture->setImage(TextureCubeMap::POSITIVE_Y, image);
 490     }
 491     result = osgDB::Registry::instance()->readImage(_tuple.get<3>(), options);
 492     if(result.success()) {
 493         osg::Image* image = result.getImage();
 494         cubeTexture->setImage(TextureCubeMap::NEGATIVE_Y, image);
 495     }
 496     result = osgDB::Registry::instance()->readImage(_tuple.get<4>(), options);
 497     if(result.success()) {
 498         osg::Image* image = result.getImage();
 499         cubeTexture->setImage(TextureCubeMap::POSITIVE_Z, image);
 500     }
 501     result = osgDB::Registry::instance()->readImage(_tuple.get<5>(), options);
 502     if(result.success()) {
 503         osg::Image* image = result.getImage();
 504         cubeTexture->setImage(TextureCubeMap::NEGATIVE_Z, image);
 505     }
 506
 507     _cubemaps[_tuple] = cubeTexture;
 508
 509     return cubeTexture;
 510 }
 511
 512 namespace {
 513 TextureBuilder::Registrar installCubeMap("cubemap", new CubeMapBuilder);
 514 }
 515
 516
 517
 518 EffectNameValue<TexEnvCombine::CombineParam> combineParamInit[] =
 519 {
 520     {"replace", TexEnvCombine::REPLACE},
 521     {"modulate", TexEnvCombine::MODULATE},
 522     {"add", TexEnvCombine::ADD},
 523     {"add-signed", TexEnvCombine::ADD_SIGNED},
 524     {"interpolate", TexEnvCombine::INTERPOLATE},
 525     {"subtract", TexEnvCombine::SUBTRACT},
 526     {"dot3-rgb", TexEnvCombine::DOT3_RGB},
 527     {"dot3-rgba", TexEnvCombine::DOT3_RGBA}
 528 };
 529
 530 EffectPropertyMap<TexEnvCombine::CombineParam> combineParams(combineParamInit);
 531
 532 EffectNameValue<TexEnvCombine::SourceParam> sourceParamInit[] =
 533 {
 534     {"constant", TexEnvCombine::CONSTANT},
 535     {"primary_color", TexEnvCombine::PRIMARY_COLOR},
 536     {"previous", TexEnvCombine::PREVIOUS},
 537     {"texture", TexEnvCombine::TEXTURE},
 538     {"texture0", TexEnvCombine::TEXTURE0},
 539     {"texture1", TexEnvCombine::TEXTURE1},
 540     {"texture2", TexEnvCombine::TEXTURE2},
 541     {"texture3", TexEnvCombine::TEXTURE3},
 542     {"texture4", TexEnvCombine::TEXTURE4},
 543     {"texture5", TexEnvCombine::TEXTURE5},
 544     {"texture6", TexEnvCombine::TEXTURE6},
 545     {"texture7", TexEnvCombine::TEXTURE7}
 546 };
 547
 548 EffectPropertyMap<TexEnvCombine::SourceParam> sourceParams(sourceParamInit);
 549
 550 EffectNameValue<TexEnvCombine::OperandParam> opParamInit[] =
 551 {
 552     {"src-color", TexEnvCombine::SRC_COLOR},
 553     {"one-minus-src-color", TexEnvCombine::ONE_MINUS_SRC_COLOR},
 554     {"src-alpha", TexEnvCombine::SRC_ALPHA},
 555     {"one-minus-src-alpha", TexEnvCombine::ONE_MINUS_SRC_ALPHA}
 556 };
 557
 558 EffectPropertyMap<TexEnvCombine::OperandParam> operandParams(opParamInit);
 559
 560 TexEnvCombine* buildTexEnvCombine(Effect* effect, const SGPropertyNode* envProp,
 561                                   const SGReaderWriterXMLOptions* options)
 562 {
 563     if (!isAttributeActive(effect, envProp))
 564         return 0;
 565     TexEnvCombine* result = new TexEnvCombine;
 566     const SGPropertyNode* p = 0;
 567     if ((p = getEffectPropertyChild(effect, envProp, "combine-rgb"))) {
 568         TexEnvCombine::CombineParam crgb = TexEnvCombine::MODULATE;
 569         findAttr(combineParams, p, crgb);
 570         result->setCombine_RGB(crgb);
 571     }
 572     if ((p = getEffectPropertyChild(effect, envProp, "combine-alpha"))) {
 573         TexEnvCombine::CombineParam calpha = TexEnvCombine::MODULATE;
 574         findAttr(combineParams, p, calpha);
 575         result->setCombine_Alpha(calpha);
 576     }
 577     if ((p = getEffectPropertyChild(effect, envProp, "source0-rgb"))) {
 578         TexEnvCombine::SourceParam source = TexEnvCombine::TEXTURE;
 579         findAttr(sourceParams, p, source);
 580         result->setSource0_RGB(source);
 581     }
 582     if ((p = getEffectPropertyChild(effect, envProp, "source1-rgb"))) {
 583         TexEnvCombine::SourceParam source = TexEnvCombine::PREVIOUS;
 584         findAttr(sourceParams, p, source);
 585         result->setSource1_RGB(source);
 586     }
 587     if ((p = getEffectPropertyChild(effect, envProp, "source2-rgb"))) {
 588         TexEnvCombine::SourceParam source = TexEnvCombine::CONSTANT;
 589         findAttr(sourceParams, p, source);
 590         result->setSource2_RGB(source);
 591     }
 592     if ((p = getEffectPropertyChild(effect, envProp, "source0-alpha"))) {
 593         TexEnvCombine::SourceParam source = TexEnvCombine::TEXTURE;
 594         findAttr(sourceParams, p, source);
 595         result->setSource0_Alpha(source);
 596     }
 597     if ((p = getEffectPropertyChild(effect, envProp, "source1-alpha"))) {
 598         TexEnvCombine::SourceParam source = TexEnvCombine::PREVIOUS;
 599         findAttr(sourceParams, p, source);
 600         result->setSource1_Alpha(source);
 601     }
 602     if ((p = getEffectPropertyChild(effect, envProp, "source2-alpha"))) {
 603         TexEnvCombine::SourceParam source = TexEnvCombine::CONSTANT;
 604         findAttr(sourceParams, p, source);
 605         result->setSource2_Alpha(source);
 606     }
 607     if ((p = getEffectPropertyChild(effect, envProp, "operand0-rgb"))) {
 608         TexEnvCombine::OperandParam op = TexEnvCombine::SRC_COLOR;
 609         findAttr(operandParams, p, op);
 610         result->setOperand0_RGB(op);
 611     }
 612     if ((p = getEffectPropertyChild(effect, envProp, "operand1-rgb"))) {
 613         TexEnvCombine::OperandParam op = TexEnvCombine::SRC_COLOR;
 614         findAttr(operandParams, p, op);
 615         result->setOperand1_RGB(op);
 616     }
 617     if ((p = getEffectPropertyChild(effect, envProp, "operand2-rgb"))) {
 618         TexEnvCombine::OperandParam op = TexEnvCombine::SRC_ALPHA;
 619         findAttr(operandParams, p, op);
 620         result->setOperand2_RGB(op);
 621     }
 622     if ((p = getEffectPropertyChild(effect, envProp, "operand0-alpha"))) {
 623         TexEnvCombine::OperandParam op = TexEnvCombine::SRC_ALPHA;
 624         findAttr(operandParams, p, op);
 625         result->setOperand0_Alpha(op);
 626     }
 627     if ((p = getEffectPropertyChild(effect, envProp, "operand1-alpha"))) {
 628         TexEnvCombine::OperandParam op = TexEnvCombine::SRC_ALPHA;
 629         findAttr(operandParams, p, op);
 630         result->setOperand1_Alpha(op);
 631     }
 632     if ((p = getEffectPropertyChild(effect, envProp, "operand2-alpha"))) {
 633         TexEnvCombine::OperandParam op = TexEnvCombine::SRC_ALPHA;
 634         findAttr(operandParams, p, op);
 635         result->setOperand2_Alpha(op);
 636     }
 637     if ((p = getEffectPropertyChild(effect, envProp, "scale-rgb"))) {
 638         result->setScale_RGB(p->getValue<float>());
 639     }
 640     if ((p = getEffectPropertyChild(effect, envProp, "scale-alpha"))) {
 641         result->setScale_Alpha(p->getValue<float>());
 642     }
 643 #if 0
 644     if ((p = getEffectPropertyChild(effect, envProp, "constant-color"))) {
 645         SGVec4d color = p->getValue<SGVec4d>();
 646         result->setConstantColor(toOsg(color));
 647     } else if ((p = getEffectPropertyChild(effect, envProp,
 648                                            "light-direction"))) {
 649         SGVec3d direction = p->getValue<SGVec3d>();
 650         result->setConstantColorAsLightDirection(toOsg(direction));
 651     }
 652 #endif
 653     const SGPropertyNode* colorNode = envProp->getChild("constant-color");
 654     if (colorNode)
 655         initFromParameters(effect, colorNode, result,
 656                            &TexEnvCombine::setConstantColor, colorFields,
 657                            options);
 658     return result;
 659 }
 660
 661 EffectNameValue<TexGen::Mode> tgenModeInit[] =
 662 {
 663     { "object-linear", TexGen::OBJECT_LINEAR},
 664     { "eye-linear", TexGen::EYE_LINEAR},
 665     { "sphere-map", TexGen::SPHERE_MAP},
 666     { "normal-map", TexGen::NORMAL_MAP},
 667     { "reflection-map", TexGen::REFLECTION_MAP}
 668 };
 669
 670 EffectPropertyMap<TexGen::Mode> tgenModes(tgenModeInit);
 671
 672 EffectNameValue<TexGen::Coord> tgenCoordInit[] =
 673 {
 674     {"s", TexGen::S},
 675     {"t", TexGen::T},
 676     {"r", TexGen::R},
 677     {"q", TexGen::Q}
 678 };
 679
 680 EffectPropertyMap<TexGen::Coord> tgenCoords(tgenCoordInit);
 681
 682 TexGen* buildTexGen(Effect* effect, const SGPropertyNode* tgenProp)
 683 {
 684     if (!isAttributeActive(effect, tgenProp))
 685         return 0;
 686     TexGen* result = new TexGen;
 687     TexGen::Mode mode = TexGen::OBJECT_LINEAR;
 688     findAttr(tgenModes, getEffectPropertyChild(effect, tgenProp, "mode"), mode);
 689     result->setMode(mode);
 690     const SGPropertyNode* planesNode = tgenProp->getChild("planes");
 691     if (planesNode) {
 692         for (int i = 0; i < planesNode->nChildren(); ++i) {
 693             const SGPropertyNode* planeNode = planesNode->getChild(i);
 694             TexGen::Coord coord;
 695             findAttr(tgenCoords, planeNode->getName(), coord);
 696             const SGPropertyNode* realNode
 697                 = getEffectPropertyNode(effect, planeNode);
 698             SGVec4d plane = realNode->getValue<SGVec4d>();
 699             result->setPlane(coord, toOsg(plane));
 700         }
 701     }
 702     return result;
 703 }
 704
 705 bool makeTextureParameters(SGPropertyNode* paramRoot, const StateSet* ss)
 706 {
 707     SGPropertyNode* texUnit = makeChild(paramRoot, "texture");
 708     const Texture* tex = getStateAttribute<Texture>(0, ss);
 709     const Texture2D* texture = dynamic_cast<const Texture2D*>(tex);
 710     makeChild(texUnit, "unit")->setValue(0);
 711     if (!tex) {
 712         // The default shader-based technique ignores active
 713         makeChild(texUnit, "active")->setValue(false);
 714         return false;
 715     }
 716     const Image* image = texture->getImage();
 717     string imageName;
 718     if (image) {
 719         imageName = image->getFileName();
 720     } else {
 721         makeChild(texUnit, "active")->setValue(false);
 722         makeChild(texUnit, "type")->setValue("white");
 723         return false;
 724     }
 725     makeChild(texUnit, "active")->setValue(true);
 726     makeChild(texUnit, "type")->setValue("2d");
 727     string filter = findName(filterModes,
 728                              texture->getFilter(Texture::MIN_FILTER));
 729     string magFilter = findName(filterModes,
 730                              texture->getFilter(Texture::MAG_FILTER));
 731     string wrapS = findName(wrapModes, texture->getWrap(Texture::WRAP_S));
 732     string wrapT = findName(wrapModes, texture->getWrap(Texture::WRAP_T));
 733     string wrapR = findName(wrapModes, texture->getWrap(Texture::WRAP_R));
 734     makeChild(texUnit, "image")->setStringValue(imageName);
 735     makeChild(texUnit, "filter")->setStringValue(filter);
 736     makeChild(texUnit, "mag-filter")->setStringValue(magFilter);
 737     makeChild(texUnit, "wrap-s")->setStringValue(wrapS);
 738     makeChild(texUnit, "wrap-t")->setStringValue(wrapT);
 739     makeChild(texUnit, "wrap-r")->setStringValue(wrapR);
 740     return true;
 741 }
 742
 743 }