simgear/scene/material/Effect.cxx

   1 // Copyright (C) 2008 - 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 "Effect.hxx"
  22 #include "EffectBuilder.hxx"
  23 #include "EffectGeode.hxx"
  24 #include "Technique.hxx"
  25 #include "Pass.hxx"
  26 #include "TextureBuilder.hxx"
  27
  28 #include <algorithm>
  29 #include <functional>
  30 #include <iterator>
  31 #include <map>
  32 #include <utility>
  33 #include <boost/tr1/unordered_map.hpp>
  34
  35 #include <boost/bind.hpp>
  36 #include <boost/foreach.hpp>
  37 #include <boost/functional/hash.hpp>
  38 #include <boost/tuple/tuple.hpp>
  39 #include <boost/tuple/tuple_comparison.hpp>
  40
  41 #include <osg/AlphaFunc>
  42 #include <osg/BlendFunc>
  43 #include <osg/CullFace>
  44 #include <osg/Depth>
  45 #include <osg/Drawable>
  46 #include <osg/Material>
  47 #include <osg/Math>
  48 #include <osg/PolygonMode>
  49 #include <osg/Program>
  50 #include <osg/Referenced>
  51 #include <osg/RenderInfo>
  52 #include <osg/ShadeModel>
  53 #include <osg/StateSet>
  54 #include <osg/Stencil>
  55 #include <osg/TexEnv>
  56 #include <osg/Texture1D>
  57 #include <osg/Texture2D>
  58 #include <osg/Texture3D>
  59 #include <osg/TextureRectangle>
  60 #include <osg/Uniform>
  61 #include <osg/Vec4d>
  62 #include <osgUtil/CullVisitor>
  63 #include <osgDB/FileUtils>
  64 #include <osgDB/Input>
  65 #include <osgDB/ParameterOutput>
  66 #include <osgDB/ReadFile>
  67 #include <osgDB/Registry>
  68
  69 #include <simgear/scene/model/SGReaderWriterXMLOptions.hxx>
  70 #include <simgear/scene/tgdb/userdata.hxx>
  71 #include <simgear/scene/util/SGSceneFeatures.hxx>
  72 #include <simgear/scene/util/StateAttributeFactory.hxx>
  73 #include <simgear/structure/OSGUtils.hxx>
  74 #include <simgear/structure/SGExpression.hxx>
  75
  76
  77
  78 namespace simgear
  79 {
  80 using namespace std;
  81 using namespace osg;
  82 using namespace osgUtil;
  83
  84 using namespace effect;
  85
  86 Effect::Effect()
  87     : _cache(0), _isRealized(false)
  88 {
  89 }
  90
  91 Effect::Effect(const Effect& rhs, const CopyOp& copyop)
  92     : root(rhs.root), parametersProp(rhs.parametersProp), _cache(0),
  93       _isRealized(rhs._isRealized)
  94 {
  95     typedef vector<ref_ptr<Technique> > TechniqueList;
  96     for (TechniqueList::const_iterator itr = rhs.techniques.begin(),
  97              end = rhs.techniques.end();
  98          itr != end;
  99          ++itr)
 100         techniques.push_back(static_cast<Technique*>(copyop(itr->get())));
 101
 102     generator = rhs.generator;
 103 }
 104
 105 // Assume that the last technique is always valid.
 106 StateSet* Effect::getDefaultStateSet()
 107 {
 108     Technique* tniq = techniques.back().get();
 109     if (!tniq)
 110         return 0;
 111     Pass* pass = tniq->passes.front().get();
 112     return pass;
 113 }
 114
 115 int Effect::getGenerator(Effect::Generator what) const
 116 {
 117     std::map<Generator,int>::const_iterator it = generator.find(what);
 118     if(it == generator.end()) return -1;
 119     else return it->second;
 120 }
 121
 122 // There should always be a valid technique in an effect.
 123
 124 Technique* Effect::chooseTechnique(RenderInfo* info)
 125 {
 126     BOOST_FOREACH(ref_ptr<Technique>& technique, techniques)
 127     {
 128         if (technique->valid(info) == Technique::VALID)
 129             return technique.get();
 130     }
 131     return 0;
 132 }
 133
 134 void Effect::resizeGLObjectBuffers(unsigned int maxSize)
 135 {
 136     BOOST_FOREACH(const ref_ptr<Technique>& technique, techniques)
 137     {
 138         technique->resizeGLObjectBuffers(maxSize);
 139     }
 140 }
 141
 142 void Effect::releaseGLObjects(osg::State* state) const
 143 {
 144     BOOST_FOREACH(const ref_ptr<Technique>& technique, techniques)
 145     {
 146         technique->releaseGLObjects(state);
 147     }
 148 }
 149
 150 Effect::~Effect()
 151 {
 152     delete _cache;
 153 }
 154
 155 void buildPass(Effect* effect, Technique* tniq, const SGPropertyNode* prop,
 156                const SGReaderWriterXMLOptions* options)
 157 {
 158     Pass* pass = new Pass;
 159     tniq->passes.push_back(pass);
 160     for (int i = 0; i < prop->nChildren(); ++i) {
 161         const SGPropertyNode* attrProp = prop->getChild(i);
 162         PassAttributeBuilder* builder
 163             = PassAttributeBuilder::find(attrProp->getNameString());
 164         if (builder)
 165             builder->buildAttribute(effect, pass, attrProp, options);
 166         else
 167             SG_LOG(SG_INPUT, SG_ALERT,
 168                    "skipping unknown pass attribute " << attrProp->getName());
 169     }
 170 }
 171
 172 // Default names for vector property components
 173 const char* vec3Names[] = {"x", "y", "z"};
 174 const char* vec4Names[] = {"x", "y", "z", "w"};
 175
 176 osg::Vec4f getColor(const SGPropertyNode* prop)
 177 {
 178     if (prop->nChildren() == 0) {
 179         if (prop->getType() == props::VEC4D) {
 180             return osg::Vec4f(toOsg(prop->getValue<SGVec4d>()));
 181         } else if (prop->getType() == props::VEC3D) {
 182             return osg::Vec4f(toOsg(prop->getValue<SGVec3d>()), 1.0f);
 183         } else {
 184             SG_LOG(SG_INPUT, SG_ALERT,
 185                    "invalid color property " << prop->getName() << " "
 186                    << prop->getStringValue());
 187             return osg::Vec4f(0.0f, 0.0f, 0.0f, 1.0f);
 188         }
 189     } else {
 190         osg::Vec4f result;
 191         static const char* colors[] = {"r", "g", "b"};
 192         for (int i = 0; i < 3; ++i) {
 193             const SGPropertyNode* componentProp = prop->getChild(colors[i]);
 194             result[i] = componentProp ? componentProp->getValue<float>() : 0.0f;
 195         }
 196         const SGPropertyNode* alphaProp = prop->getChild("a");
 197         result[3] = alphaProp ? alphaProp->getValue<float>() : 1.0f;
 198         return result;
 199     }
 200 }
 201
 202 struct LightingBuilder : public PassAttributeBuilder
 203 {
 204     void buildAttribute(Effect* effect, Pass* pass, const SGPropertyNode* prop,
 205                         const SGReaderWriterXMLOptions* options);
 206 };
 207
 208 void LightingBuilder::buildAttribute(Effect* effect, Pass* pass,
 209                                      const SGPropertyNode* prop,
 210                                      const SGReaderWriterXMLOptions* options)
 211 {
 212     const SGPropertyNode* realProp = getEffectPropertyNode(effect, prop);
 213     if (!realProp)
 214         return;
 215     pass->setMode(GL_LIGHTING, (realProp->getValue<bool>() ? StateAttribute::ON
 216                                 : StateAttribute::OFF));
 217 }
 218
 219 InstallAttributeBuilder<LightingBuilder> installLighting("lighting");
 220
 221 struct ShadeModelBuilder : public PassAttributeBuilder
 222 {
 223     void buildAttribute(Effect* effect, Pass* pass, const SGPropertyNode* prop,
 224                         const SGReaderWriterXMLOptions* options)
 225     {
 226         const SGPropertyNode* realProp = getEffectPropertyNode(effect, prop);
 227         if (!realProp)
 228             return;
 229         StateAttributeFactory *attrFact = StateAttributeFactory::instance();
 230         string propVal = realProp->getStringValue();
 231         if (propVal == "flat")
 232             pass->setAttribute(attrFact->getFlatShadeModel());
 233         else if (propVal == "smooth")
 234             pass->setAttribute(attrFact->getSmoothShadeModel());
 235         else
 236             SG_LOG(SG_INPUT, SG_ALERT,
 237                    "invalid shade model property " << propVal);
 238     }
 239 };
 240
 241 InstallAttributeBuilder<ShadeModelBuilder> installShadeModel("shade-model");
 242
 243 struct CullFaceBuilder : PassAttributeBuilder
 244 {
 245     void buildAttribute(Effect* effect, Pass* pass, const SGPropertyNode* prop,
 246                         const SGReaderWriterXMLOptions* options)
 247     {
 248         const SGPropertyNode* realProp = getEffectPropertyNode(effect, prop);
 249         if (!realProp) {
 250             pass->setMode(GL_CULL_FACE, StateAttribute::OFF);
 251             return;
 252         }
 253         StateAttributeFactory *attrFact = StateAttributeFactory::instance();
 254         string propVal = realProp->getStringValue();
 255         if (propVal == "front")
 256             pass->setAttributeAndModes(attrFact->getCullFaceFront());
 257         else if (propVal == "back")
 258             pass->setAttributeAndModes(attrFact->getCullFaceBack());
 259         else if (propVal == "front-back")
 260             pass->setAttributeAndModes(new CullFace(CullFace::FRONT_AND_BACK));
 261         else if (propVal == "off")
 262             pass->setMode(GL_CULL_FACE, StateAttribute::OFF);
 263         else
 264             SG_LOG(SG_INPUT, SG_ALERT,
 265                    "invalid cull face property " << propVal);
 266     }
 267 };
 268
 269 InstallAttributeBuilder<CullFaceBuilder> installCullFace("cull-face");
 270
 271 struct ColorMaskBuilder : PassAttributeBuilder
 272 {
 273     void buildAttribute(Effect* effect, Pass* pass, const SGPropertyNode* prop,
 274                         const SGReaderWriterXMLOptions* options)
 275     {
 276         const SGPropertyNode* realProp = getEffectPropertyNode(effect, prop);
 277         if (!realProp)
 278             return;
 279
 280         ColorMask *mask = new ColorMask;
 281         Vec4 m = getColor(realProp);
 282         mask->setMask(m.r(), m.g(), m.b(), m.a());
 283         pass->setAttributeAndModes(mask);
 284     }
 285 };
 286
 287 InstallAttributeBuilder<ColorMaskBuilder> installColorMask("color-mask");
 288
 289 EffectNameValue<StateSet::RenderingHint> renderingHintInit[] =
 290 {
 291     { "default", StateSet::DEFAULT_BIN },
 292     { "opaque", StateSet::OPAQUE_BIN },
 293     { "transparent", StateSet::TRANSPARENT_BIN }
 294 };
 295
 296 EffectPropertyMap<StateSet::RenderingHint> renderingHints(renderingHintInit);
 297
 298 struct HintBuilder : public PassAttributeBuilder
 299 {
 300     void buildAttribute(Effect* effect, Pass* pass, const SGPropertyNode* prop,
 301                         const SGReaderWriterXMLOptions* options)
 302     {
 303         const SGPropertyNode* realProp = getEffectPropertyNode(effect, prop);
 304         if (!realProp)
 305             return;
 306         StateSet::RenderingHint renderingHint = StateSet::DEFAULT_BIN;
 307         findAttr(renderingHints, realProp, renderingHint);
 308         pass->setRenderingHint(renderingHint);
 309     }
 310 };
 311
 312 InstallAttributeBuilder<HintBuilder> installHint("rendering-hint");
 313
 314 struct RenderBinBuilder : public PassAttributeBuilder
 315 {
 316     void buildAttribute(Effect* effect, Pass* pass, const SGPropertyNode* prop,
 317                         const SGReaderWriterXMLOptions* options)
 318     {
 319         if (!isAttributeActive(effect, prop))
 320             return;
 321         const SGPropertyNode* binProp = prop->getChild("bin-number");
 322         binProp = getEffectPropertyNode(effect, binProp);
 323         const SGPropertyNode* nameProp = prop->getChild("bin-name");
 324         nameProp = getEffectPropertyNode(effect, nameProp);
 325         if (binProp && nameProp) {
 326             pass->setRenderBinDetails(binProp->getIntValue(),
 327                                       nameProp->getStringValue());
 328         } else {
 329             if (!binProp)
 330                 SG_LOG(SG_INPUT, SG_ALERT,
 331                        "No render bin number specified in render bin section");
 332             if (!nameProp)
 333                 SG_LOG(SG_INPUT, SG_ALERT,
 334                        "No render bin name specified in render bin section");
 335         }
 336     }
 337 };
 338
 339 InstallAttributeBuilder<RenderBinBuilder> installRenderBin("render-bin");
 340
 341 struct MaterialBuilder : public PassAttributeBuilder
 342 {
 343     void buildAttribute(Effect* effect, Pass* pass, const SGPropertyNode* prop,
 344                         const SGReaderWriterXMLOptions* options);
 345 };
 346
 347 EffectNameValue<Material::ColorMode> colorModeInit[] =
 348 {
 349     { "ambient", Material::AMBIENT },
 350     { "ambient-and-diffuse", Material::AMBIENT_AND_DIFFUSE },
 351     { "diffuse", Material::DIFFUSE },
 352     { "emissive", Material::EMISSION },
 353     { "specular", Material::SPECULAR },
 354     { "off", Material::OFF }
 355 };
 356 EffectPropertyMap<Material::ColorMode> colorModes(colorModeInit);
 357
 358 void MaterialBuilder::buildAttribute(Effect* effect, Pass* pass,
 359                                      const SGPropertyNode* prop,
 360                                      const SGReaderWriterXMLOptions* options)
 361 {
 362     if (!isAttributeActive(effect, prop))
 363         return;
 364     Material* mat = new Material;
 365     const SGPropertyNode* color = 0;
 366     if ((color = getEffectPropertyChild(effect, prop, "ambient")))
 367         mat->setAmbient(Material::FRONT_AND_BACK, getColor(color));
 368     if ((color = getEffectPropertyChild(effect, prop, "ambient-front")))
 369         mat->setAmbient(Material::FRONT, getColor(color));
 370     if ((color = getEffectPropertyChild(effect, prop, "ambient-back")))
 371         mat->setAmbient(Material::BACK, getColor(color));
 372     if ((color = getEffectPropertyChild(effect, prop, "diffuse")))
 373         mat->setDiffuse(Material::FRONT_AND_BACK, getColor(color));
 374     if ((color = getEffectPropertyChild(effect, prop, "diffuse-front")))
 375         mat->setDiffuse(Material::FRONT, getColor(color));
 376     if ((color = getEffectPropertyChild(effect, prop, "diffuse-back")))
 377         mat->setDiffuse(Material::BACK, getColor(color));
 378     if ((color = getEffectPropertyChild(effect, prop, "specular")))
 379         mat->setSpecular(Material::FRONT_AND_BACK, getColor(color));
 380     if ((color = getEffectPropertyChild(effect, prop, "specular-front")))
 381         mat->setSpecular(Material::FRONT, getColor(color));
 382     if ((color = getEffectPropertyChild(effect, prop, "specular-back")))
 383         mat->setSpecular(Material::BACK, getColor(color));
 384     if ((color = getEffectPropertyChild(effect, prop, "emissive")))
 385         mat->setEmission(Material::FRONT_AND_BACK, getColor(color));
 386     if ((color = getEffectPropertyChild(effect, prop, "emissive-front")))
 387         mat->setEmission(Material::FRONT, getColor(color));
 388     if ((color = getEffectPropertyChild(effect, prop, "emissive-back")))
 389         mat->setEmission(Material::BACK, getColor(color));
 390     const SGPropertyNode* shininess = 0;
 391     mat->setShininess(Material::FRONT_AND_BACK, 0.0f);
 392     if ((shininess = getEffectPropertyChild(effect, prop, "shininess")))
 393         mat->setShininess(Material::FRONT_AND_BACK, shininess->getFloatValue());
 394     if ((shininess = getEffectPropertyChild(effect, prop, "shininess-front")))
 395         mat->setShininess(Material::FRONT, shininess->getFloatValue());
 396     if ((shininess = getEffectPropertyChild(effect, prop, "shininess-back")))
 397         mat->setShininess(Material::BACK, shininess->getFloatValue());
 398     Material::ColorMode colorMode = Material::OFF;
 399     findAttr(colorModes, getEffectPropertyChild(effect, prop, "color-mode"),
 400              colorMode);
 401     mat->setColorMode(colorMode);
 402     pass->setAttribute(mat);
 403 }
 404
 405 InstallAttributeBuilder<MaterialBuilder> installMaterial("material");
 406
 407 EffectNameValue<BlendFunc::BlendFuncMode> blendFuncModesInit[] =
 408 {
 409     {"dst-alpha", BlendFunc::DST_ALPHA},
 410     {"dst-color", BlendFunc::DST_COLOR},
 411     {"one", BlendFunc::ONE},
 412     {"one-minus-dst-alpha", BlendFunc::ONE_MINUS_DST_ALPHA},
 413     {"one-minus-dst-color", BlendFunc::ONE_MINUS_DST_COLOR},
 414     {"one-minus-src-alpha", BlendFunc::ONE_MINUS_SRC_ALPHA},
 415     {"one-minus-src-color", BlendFunc::ONE_MINUS_SRC_COLOR},
 416     {"src-alpha", BlendFunc::SRC_ALPHA},
 417     {"src-alpha-saturate", BlendFunc::SRC_ALPHA_SATURATE},
 418     {"src-color", BlendFunc::SRC_COLOR},
 419     {"constant-color", BlendFunc::CONSTANT_COLOR},
 420     {"one-minus-constant-color", BlendFunc::ONE_MINUS_CONSTANT_COLOR},
 421     {"constant-alpha", BlendFunc::CONSTANT_ALPHA},
 422     {"one-minus-constant-alpha", BlendFunc::ONE_MINUS_CONSTANT_ALPHA},
 423     {"zero", BlendFunc::ZERO}
 424 };
 425 EffectPropertyMap<BlendFunc::BlendFuncMode> blendFuncModes(blendFuncModesInit);
 426
 427 struct BlendBuilder : public PassAttributeBuilder
 428 {
 429     void buildAttribute(Effect* effect, Pass* pass, const SGPropertyNode* prop,
 430                         const SGReaderWriterXMLOptions* options)
 431     {
 432         if (!isAttributeActive(effect, prop))
 433             return;
 434         // XXX Compatibility with early <blend> syntax; should go away
 435         // before a release
 436         const SGPropertyNode* realProp = getEffectPropertyNode(effect, prop);
 437         if (!realProp)
 438             return;
 439         if (realProp->nChildren() == 0) {
 440             pass->setMode(GL_BLEND, (realProp->getBoolValue()
 441                                      ? StateAttribute::ON
 442                                      : StateAttribute::OFF));
 443             return;
 444         }
 445
 446         const SGPropertyNode* pmode = getEffectPropertyChild(effect, prop,
 447                                                              "mode");
 448         // XXX When dynamic parameters are supported, this code should
 449         // create the blend function even if the mode is off.
 450         if (pmode && !pmode->getValue<bool>()) {
 451             pass->setMode(GL_BLEND, StateAttribute::OFF);
 452             return;
 453         }
 454         const SGPropertyNode* psource
 455             = getEffectPropertyChild(effect, prop, "source");
 456         const SGPropertyNode* pdestination
 457             = getEffectPropertyChild(effect, prop, "destination");
 458         const SGPropertyNode* psourceRGB
 459             = getEffectPropertyChild(effect, prop, "source-rgb");
 460         const SGPropertyNode* psourceAlpha
 461             = getEffectPropertyChild(effect, prop, "source-alpha");
 462         const SGPropertyNode* pdestRGB
 463             = getEffectPropertyChild(effect, prop, "destination-rgb");
 464         const SGPropertyNode* pdestAlpha
 465             = getEffectPropertyChild(effect, prop, "destination-alpha");
 466         BlendFunc::BlendFuncMode sourceMode = BlendFunc::ONE;
 467         BlendFunc::BlendFuncMode destMode = BlendFunc::ZERO;
 468         if (psource)
 469             findAttr(blendFuncModes, psource, sourceMode);
 470         if (pdestination)
 471             findAttr(blendFuncModes, pdestination, destMode);
 472         if (psource && pdestination
 473             && !(psourceRGB || psourceAlpha || pdestRGB || pdestAlpha)
 474             && sourceMode == BlendFunc::SRC_ALPHA
 475             && destMode == BlendFunc::ONE_MINUS_SRC_ALPHA) {
 476             pass->setAttributeAndModes(StateAttributeFactory::instance()
 477                                        ->getStandardBlendFunc());
 478             return;
 479         }
 480         BlendFunc* blendFunc = new BlendFunc;
 481         if (psource)
 482             blendFunc->setSource(sourceMode);
 483         if (pdestination)
 484             blendFunc->setDestination(destMode);
 485         if (psourceRGB) {
 486             BlendFunc::BlendFuncMode sourceRGBMode;
 487             findAttr(blendFuncModes, psourceRGB, sourceRGBMode);
 488             blendFunc->setSourceRGB(sourceRGBMode);
 489         }
 490         if (pdestRGB) {
 491             BlendFunc::BlendFuncMode destRGBMode;
 492             findAttr(blendFuncModes, pdestRGB, destRGBMode);
 493             blendFunc->setDestinationRGB(destRGBMode);
 494         }
 495         if (psourceAlpha) {
 496             BlendFunc::BlendFuncMode sourceAlphaMode;
 497             findAttr(blendFuncModes, psourceAlpha, sourceAlphaMode);
 498             blendFunc->setSourceAlpha(sourceAlphaMode);
 499         }
 500         if (pdestAlpha) {
 501             BlendFunc::BlendFuncMode destAlphaMode;
 502             findAttr(blendFuncModes, pdestAlpha, destAlphaMode);
 503             blendFunc->setDestinationAlpha(destAlphaMode);
 504         }
 505         pass->setAttributeAndModes(blendFunc);
 506     }
 507 };
 508
 509 InstallAttributeBuilder<BlendBuilder> installBlend("blend");
 510
 511
 512 EffectNameValue<Stencil::Function> stencilFunctionInit[] =
 513 {
 514     {"never", Stencil::NEVER },
 515     {"less", Stencil::LESS},
 516     {"equal", Stencil::EQUAL},
 517     {"less-or-equal", Stencil::LEQUAL},
 518     {"greater", Stencil::GREATER},
 519     {"not-equal", Stencil::NOTEQUAL},
 520     {"greater-or-equal", Stencil::GEQUAL},
 521     {"always", Stencil::ALWAYS}
 522 };
 523
 524 EffectPropertyMap<Stencil::Function> stencilFunction(stencilFunctionInit);
 525
 526 EffectNameValue<Stencil::Operation> stencilOperationInit[] =
 527 {
 528     {"keep", Stencil::KEEP},
 529     {"zero", Stencil::ZERO},
 530     {"replace", Stencil::REPLACE},
 531     {"increase", Stencil::INCR},
 532     {"decrease", Stencil::DECR},
 533     {"invert", Stencil::INVERT},
 534     {"increase-wrap", Stencil::INCR_WRAP},
 535     {"decrease-wrap", Stencil::DECR_WRAP}
 536 };
 537
 538 EffectPropertyMap<Stencil::Operation> stencilOperation(stencilOperationInit);
 539
 540 struct StencilBuilder : public PassAttributeBuilder
 541 {
 542     void buildAttribute(Effect* effect, Pass* pass, const SGPropertyNode* prop,
 543                         const SGReaderWriterXMLOptions* options)
 544     {
 545         if (!isAttributeActive(effect, prop))
 546             return;
 547
 548         const SGPropertyNode* pmode = getEffectPropertyChild(effect, prop,
 549                                                              "mode");
 550         if (pmode && !pmode->getValue<bool>()) {
 551             pass->setMode(GL_STENCIL, StateAttribute::OFF);
 552             return;
 553         }
 554         const SGPropertyNode* pfunction
 555             = getEffectPropertyChild(effect, prop, "function");
 556         const SGPropertyNode* pvalue
 557             = getEffectPropertyChild(effect, prop, "value");
 558         const SGPropertyNode* pmask
 559             = getEffectPropertyChild(effect, prop, "mask");
 560         const SGPropertyNode* psfail
 561             = getEffectPropertyChild(effect, prop, "stencil-fail");
 562         const SGPropertyNode* pzfail
 563             = getEffectPropertyChild(effect, prop, "z-fail");
 564         const SGPropertyNode* ppass
 565             = getEffectPropertyChild(effect, prop, "pass");
 566
 567         Stencil::Function func = Stencil::ALWAYS;  // Always pass
 568         int ref = 0;
 569         unsigned int mask = ~0u;  // All bits on
 570         Stencil::Operation sfailop = Stencil::KEEP;  // Keep the old values as default
 571         Stencil::Operation zfailop = Stencil::KEEP;
 572         Stencil::Operation passop = Stencil::KEEP;
 573
 574         ref_ptr<Stencil> stencilFunc = new Stencil;
 575
 576         if (pfunction)
 577             findAttr(stencilFunction, pfunction, func);
 578         if (pvalue)
 579             ref = pvalue->getIntValue();
 580         if (pmask)
 581             mask = pmask->getIntValue();
 582
 583         if (psfail)
 584             findAttr(stencilOperation, psfail, sfailop);
 585         if (pzfail)
 586             findAttr(stencilOperation, pzfail, zfailop);
 587         if (ppass)
 588             findAttr(stencilOperation, ppass, passop);
 589
 590         // Set the stencil operation
 591         stencilFunc->setFunction(func, ref, mask);
 592
 593         // Set the operation, s-fail, s-pass/z-fail, s-pass/z-pass
 594         stencilFunc->setOperation(sfailop, zfailop, passop);
 595
 596         // Add the operation to pass
 597         pass->setAttributeAndModes(stencilFunc.get());
 598     }
 599 };
 600
 601 InstallAttributeBuilder<StencilBuilder> installStencil("stencil");
 602
 603
 604 EffectNameValue<AlphaFunc::ComparisonFunction> alphaComparisonInit[] =
 605 {
 606     {"never", AlphaFunc::NEVER},
 607     {"less", AlphaFunc::LESS},
 608     {"equal", AlphaFunc::EQUAL},
 609     {"lequal", AlphaFunc::LEQUAL},
 610     {"greater", AlphaFunc::GREATER},
 611     {"notequal", AlphaFunc::NOTEQUAL},
 612     {"gequal", AlphaFunc::GEQUAL},
 613     {"always", AlphaFunc::ALWAYS}
 614 };
 615 EffectPropertyMap<AlphaFunc::ComparisonFunction>
 616 alphaComparison(alphaComparisonInit);
 617
 618 struct AlphaTestBuilder : public PassAttributeBuilder
 619 {
 620     void buildAttribute(Effect* effect, Pass* pass, const SGPropertyNode* prop,
 621                         const SGReaderWriterXMLOptions* options)
 622     {
 623         if (!isAttributeActive(effect, prop))
 624             return;
 625         // XXX Compatibility with early <alpha-test> syntax; should go away
 626         // before a release
 627         const SGPropertyNode* realProp = getEffectPropertyNode(effect, prop);
 628         if (!realProp)
 629             return;
 630         if (realProp->nChildren() == 0) {
 631             pass->setMode(GL_ALPHA_TEST, (realProp->getBoolValue()
 632                                      ? StateAttribute::ON
 633                                      : StateAttribute::OFF));
 634             return;
 635         }
 636
 637         const SGPropertyNode* pmode = getEffectPropertyChild(effect, prop,
 638                                                              "mode");
 639         // XXX When dynamic parameters are supported, this code should
 640         // create the blend function even if the mode is off.
 641         if (pmode && !pmode->getValue<bool>()) {
 642             pass->setMode(GL_ALPHA_TEST, StateAttribute::OFF);
 643             return;
 644         }
 645         const SGPropertyNode* pComp = getEffectPropertyChild(effect, prop,
 646                                                              "comparison");
 647         const SGPropertyNode* pRef = getEffectPropertyChild(effect, prop,
 648                                                              "reference");
 649         AlphaFunc::ComparisonFunction func = AlphaFunc::ALWAYS;
 650         float refValue = 1.0f;
 651         if (pComp)
 652             findAttr(alphaComparison, pComp, func);
 653         if (pRef)
 654             refValue = pRef->getValue<float>();
 655         if (func == AlphaFunc::GREATER && osg::equivalent(refValue, 1.0f)) {
 656             pass->setAttributeAndModes(StateAttributeFactory::instance()
 657                                        ->getStandardAlphaFunc());
 658         } else {
 659             AlphaFunc* alphaFunc = new AlphaFunc;
 660             alphaFunc->setFunction(func);
 661             alphaFunc->setReferenceValue(refValue);
 662             pass->setAttributeAndModes(alphaFunc);
 663         }
 664     }
 665 };
 666
 667 InstallAttributeBuilder<AlphaTestBuilder> installAlphaTest("alpha-test");
 668
 669 InstallAttributeBuilder<TextureUnitBuilder> textureUnitBuilder("texture-unit");
 670
 671 // Shader key, used both for shaders with relative and absolute names
 672 typedef pair<string, Shader::Type> ShaderKey;
 673
 674 struct ProgramKey
 675 {
 676     typedef pair<string, int> AttribKey;
 677     osgDB::FilePathList paths;
 678     vector<ShaderKey> shaders;
 679     vector<AttribKey> attributes;
 680     struct EqualTo
 681     {
 682         bool operator()(const ProgramKey& lhs, const ProgramKey& rhs) const
 683         {
 684             return (lhs.paths.size() == rhs.paths.size()
 685                     && equal(lhs.paths.begin(), lhs.paths.end(),
 686                              rhs.paths.begin())
 687                     && lhs.shaders.size() == rhs.shaders.size()
 688                     && equal (lhs.shaders.begin(), lhs.shaders.end(),
 689                               rhs.shaders.begin())
 690                     && lhs.attributes.size() == rhs.attributes.size()
 691                     && equal(lhs.attributes.begin(), lhs.attributes.end(),
 692                              rhs.attributes.begin()));
 693         }
 694     };
 695 };
 696
 697 size_t hash_value(const ProgramKey& key)
 698 {
 699     size_t seed = 0;
 700     boost::hash_range(seed, key.paths.begin(), key.paths.end());
 701     boost::hash_range(seed, key.shaders.begin(), key.shaders.end());
 702     boost::hash_range(seed, key.attributes.begin(), key.attributes.end());
 703     return seed;
 704 }
 705
 706 // XXX Should these be protected by a mutex? Probably
 707
 708 typedef tr1::unordered_map<ProgramKey, ref_ptr<Program>,
 709                            boost::hash<ProgramKey>, ProgramKey::EqualTo>
 710 ProgramMap;
 711 ProgramMap programMap;
 712
 713 typedef tr1::unordered_map<ShaderKey, ref_ptr<Shader>, boost::hash<ShaderKey> >
 714 ShaderMap;
 715 ShaderMap shaderMap;
 716
 717 void reload_shaders()
 718 {
 719     for(ShaderMap::iterator sitr = shaderMap.begin(); sitr != shaderMap.end(); ++sitr)
 720     {
 721         Shader *shader = sitr->second.get();
 722         string fileName = osgDB::findDataFile(sitr->first.first);
 723         if (!fileName.empty()) {
 724             shader->loadShaderSourceFromFile(fileName);
 725         }
 726     }
 727 }
 728
 729 struct ShaderProgramBuilder : PassAttributeBuilder
 730 {
 731     void buildAttribute(Effect* effect, Pass* pass, const SGPropertyNode* prop,
 732                         const SGReaderWriterXMLOptions* options);
 733 };
 734
 735 void ShaderProgramBuilder::buildAttribute(Effect* effect, Pass* pass,
 736                                           const SGPropertyNode* prop,
 737                                           const SGReaderWriterXMLOptions*
 738                                           options)
 739 {
 740     using namespace boost;
 741     if (!isAttributeActive(effect, prop))
 742         return;
 743     PropertyList pVertShaders = prop->getChildren("vertex-shader");
 744     PropertyList pFragShaders = prop->getChildren("fragment-shader");
 745     PropertyList pAttributes = prop->getChildren("attribute");
 746     ProgramKey prgKey;
 747     for (PropertyList::iterator itr = pVertShaders.begin(),
 748              e = pVertShaders.end();
 749          itr != e;
 750          ++itr)
 751         prgKey.shaders.push_back(ShaderKey((*itr)->getStringValue(),
 752                                            Shader::VERTEX));
 753     for (PropertyList::iterator itr = pFragShaders.begin(),
 754              e = pFragShaders.end();
 755          itr != e;
 756          ++itr)
 757         prgKey.shaders.push_back(ShaderKey((*itr)->getStringValue(),
 758                                            Shader::FRAGMENT));
 759     for (PropertyList::iterator itr = pAttributes.begin(),
 760              e = pAttributes.end();
 761          itr != e;
 762          ++itr) {
 763         const SGPropertyNode* pName = getEffectPropertyChild(effect, *itr,
 764                                                              "name");
 765         const SGPropertyNode* pIndex = getEffectPropertyChild(effect, *itr,
 766                                                               "index");
 767         if (!pName || ! pIndex)
 768             throw BuilderException("malformed attribute property");
 769         prgKey.attributes
 770             .push_back(ProgramKey::AttribKey(pName->getStringValue(),
 771                                              pIndex->getValue<int>()));
 772     }
 773     if (options)
 774         prgKey.paths = options->getDatabasePathList();
 775     Program* program = 0;
 776     ProgramMap::iterator pitr = programMap.find(prgKey);
 777     if (pitr != programMap.end()) {
 778         program = pitr->second.get();
 779     } else {
 780         program = new Program;
 781         // Add vertex shaders, then fragment shaders
 782         PropertyList& pvec = pVertShaders;
 783         Shader::Type stype = Shader::VERTEX;
 784         for (int i = 0; i < 2; ++i) {
 785             for (PropertyList::iterator nameItr = pvec.begin(), e = pvec.end();
 786                  nameItr != e;
 787                  ++nameItr) {
 788                 string shaderName = (*nameItr)->getStringValue();
 789                 string fileName = osgDB::findDataFile(shaderName, options);
 790                 if (fileName.empty())
 791                     throw BuilderException(string("couldn't find shader ") +
 792                                            shaderName);
 793                 ShaderKey skey(fileName, stype);
 794                 ShaderMap::iterator sitr = shaderMap.find(skey);
 795                 if (sitr != shaderMap.end()) {
 796                     program->addShader(sitr->second.get());
 797                 } else {
 798                     ref_ptr<Shader> shader = new Shader(stype);
 799                     if (shader->loadShaderSourceFromFile(fileName)) {
 800                         program->addShader(shader.get());
 801                         shaderMap.insert(ShaderMap::value_type(skey, shader));
 802                     }
 803                 }
 804             }
 805             pvec = pFragShaders;
 806             stype = Shader::FRAGMENT;
 807         }
 808         BOOST_FOREACH(const ProgramKey::AttribKey& key, prgKey.attributes) {
 809             program->addBindAttribLocation(key.first, key.second);
 810         }
 811        programMap.insert(ProgramMap::value_type(prgKey, program));
 812     }
 813     pass->setAttributeAndModes(program);
 814 }
 815
 816 InstallAttributeBuilder<ShaderProgramBuilder> installShaderProgram("program");
 817
 818 EffectNameValue<Uniform::Type> uniformTypesInit[] =
 819 {
 820     {"float", Uniform::FLOAT},
 821     {"float-vec3", Uniform::FLOAT_VEC3},
 822     {"float-vec4", Uniform::FLOAT_VEC4},
 823     {"sampler-1d", Uniform::SAMPLER_1D},
 824     {"sampler-1d-shadow", Uniform::SAMPLER_1D_SHADOW},
 825     {"sampler-2d", Uniform::SAMPLER_2D},
 826     {"sampler-2d-shadow", Uniform::SAMPLER_2D_SHADOW},
 827     {"sampler-3d", Uniform::SAMPLER_3D},
 828     {"sampler-cube", Uniform::SAMPLER_CUBE}
 829 };
 830 EffectPropertyMap<Uniform::Type> uniformTypes(uniformTypesInit);
 831
 832 struct UniformBuilder :public PassAttributeBuilder
 833 {
 834     void buildAttribute(Effect* effect, Pass* pass, const SGPropertyNode* prop,
 835                         const SGReaderWriterXMLOptions* options)
 836     {
 837         if (!isAttributeActive(effect, prop))
 838             return;
 839         const SGPropertyNode* nameProp = prop->getChild("name");
 840         const SGPropertyNode* typeProp = prop->getChild("type");
 841         const SGPropertyNode* valProp = prop->getChild("value");
 842         string name;
 843         Uniform::Type uniformType = Uniform::FLOAT;
 844         if (nameProp) {
 845             name = nameProp->getStringValue();
 846         } else {
 847             SG_LOG(SG_INPUT, SG_ALERT, "No name for uniform property ");
 848             return;
 849         }
 850         if (!valProp) {
 851             SG_LOG(SG_INPUT, SG_ALERT, "No value for uniform property "
 852                    << name);
 853             return;
 854         }
 855         if (!typeProp) {
 856             props::Type propType = valProp->getType();
 857             switch (propType) {
 858             case props::FLOAT:
 859             case props::DOUBLE:
 860                 break;          // default float type;
 861             case props::VEC3D:
 862                 uniformType = Uniform::FLOAT_VEC3;
 863                 break;
 864             case props::VEC4D:
 865                 uniformType = Uniform::FLOAT_VEC4;
 866                 break;
 867             default:
 868                 SG_LOG(SG_INPUT, SG_ALERT, "Can't deduce type of uniform "
 869                        << name);
 870                 return;
 871             }
 872         } else {
 873             findAttr(uniformTypes, typeProp, uniformType);
 874         }
 875         ref_ptr<Uniform> uniform = new Uniform;
 876         uniform->setName(name);
 877         uniform->setType(uniformType);
 878         switch (uniformType) {
 879         case Uniform::FLOAT:
 880             initFromParameters(effect, valProp, uniform.get(),
 881                                static_cast<bool (Uniform::*)(float)>(&Uniform::set),
 882                                options);
 883             break;
 884         case Uniform::FLOAT_VEC3:
 885             initFromParameters(effect, valProp, uniform.get(),
 886                                static_cast<bool (Uniform::*)(const Vec3&)>(&Uniform::set),
 887                                vec3Names, options);
 888             break;
 889         case Uniform::FLOAT_VEC4:
 890             initFromParameters(effect, valProp, uniform.get(),
 891                                static_cast<bool (Uniform::*)(const Vec4&)>(&Uniform::set),
 892                                vec4Names, options);
 893             break;
 894         case Uniform::SAMPLER_1D:
 895         case Uniform::SAMPLER_2D:
 896         case Uniform::SAMPLER_3D:
 897         case Uniform::SAMPLER_1D_SHADOW:
 898         case Uniform::SAMPLER_2D_SHADOW:
 899         case Uniform::SAMPLER_CUBE:
 900             initFromParameters(effect, valProp, uniform.get(),
 901                                static_cast<bool (Uniform::*)(int)>(&Uniform::set),
 902                                options);
 903             break;
 904         default: // avoid compiler warning
 905             break;
 906         }
 907         pass->addUniform(uniform.get());
 908     }
 909 };
 910
 911 InstallAttributeBuilder<UniformBuilder> installUniform("uniform");
 912
 913 // Not sure what to do with "name". At one point I wanted to use it to
 914 // order the passes, but I do support render bin and stuff too...
 915
 916 struct NameBuilder : public PassAttributeBuilder
 917 {
 918     void buildAttribute(Effect* effect, Pass* pass, const SGPropertyNode* prop,
 919                         const SGReaderWriterXMLOptions* options)
 920     {
 921         // name can't use <use>
 922         string name = prop->getStringValue();
 923         if (!name.empty())
 924             pass->setName(name);
 925     }
 926 };
 927
 928 InstallAttributeBuilder<NameBuilder> installName("name");
 929
 930 EffectNameValue<PolygonMode::Mode> polygonModeModesInit[] =
 931 {
 932     {"fill", PolygonMode::FILL},
 933     {"line", PolygonMode::LINE},
 934     {"point", PolygonMode::POINT}
 935 };
 936 EffectPropertyMap<PolygonMode::Mode> polygonModeModes(polygonModeModesInit);
 937
 938 struct PolygonModeBuilder : public PassAttributeBuilder
 939 {
 940     void buildAttribute(Effect* effect, Pass* pass, const SGPropertyNode* prop,
 941                         const SGReaderWriterXMLOptions* options)
 942     {
 943         if (!isAttributeActive(effect, prop))
 944             return;
 945         const SGPropertyNode* frontProp
 946             = getEffectPropertyChild(effect, prop, "front");
 947         const SGPropertyNode* backProp
 948             = getEffectPropertyChild(effect, prop, "back");
 949         ref_ptr<PolygonMode> pmode = new PolygonMode;
 950         PolygonMode::Mode frontMode = PolygonMode::FILL;
 951         PolygonMode::Mode backMode = PolygonMode::FILL;
 952         if (frontProp) {
 953             findAttr(polygonModeModes, frontProp, frontMode);
 954             pmode->setMode(PolygonMode::FRONT, frontMode);
 955         }
 956         if (backProp) {
 957             findAttr(polygonModeModes, backProp, backMode);
 958             pmode->setMode(PolygonMode::BACK, backMode);
 959         }
 960         pass->setAttribute(pmode.get());
 961     }
 962 };
 963
 964 InstallAttributeBuilder<PolygonModeBuilder> installPolygonMode("polygon-mode");
 965
 966 struct VertexProgramTwoSideBuilder : public PassAttributeBuilder
 967 {
 968     void buildAttribute(Effect* effect, Pass* pass, const SGPropertyNode* prop,
 969                         const SGReaderWriterXMLOptions* options)
 970     {
 971         const SGPropertyNode* realProp = getEffectPropertyNode(effect, prop);
 972         if (!realProp)
 973             return;
 974         pass->setMode(GL_VERTEX_PROGRAM_TWO_SIDE,
 975                       (realProp->getValue<bool>()
 976                        ? StateAttribute::ON : StateAttribute::OFF));
 977     }
 978 };
 979
 980 InstallAttributeBuilder<VertexProgramTwoSideBuilder>
 981 installTwoSide("vertex-program-two-side");
 982
 983 struct VertexProgramPointSizeBuilder : public PassAttributeBuilder
 984 {
 985     void buildAttribute(Effect* effect, Pass* pass, const SGPropertyNode* prop,
 986                         const SGReaderWriterXMLOptions* options)
 987     {
 988         const SGPropertyNode* realProp = getEffectPropertyNode(effect, prop);
 989         if (!realProp)
 990             return;
 991         pass->setMode(GL_VERTEX_PROGRAM_POINT_SIZE,
 992                       (realProp->getValue<bool>()
 993                        ? StateAttribute::ON : StateAttribute::OFF));
 994     }
 995 };
 996
 997 InstallAttributeBuilder<VertexProgramPointSizeBuilder>
 998 installPointSize("vertex-program-point-size");
 999
1000 EffectNameValue<Depth::Function> depthFunctionInit[] =
1001 {
1002     {"never", Depth::NEVER},
1003     {"less", Depth::LESS},
1004     {"equal", Depth::EQUAL},
1005     {"lequal", Depth::LEQUAL},
1006     {"greater", Depth::GREATER},
1007     {"notequal", Depth::NOTEQUAL},
1008     {"gequal", Depth::GEQUAL},
1009     {"always", Depth::ALWAYS}
1010 };
1011 EffectPropertyMap<Depth::Function> depthFunction(depthFunctionInit);
1012
1013 struct DepthBuilder : public PassAttributeBuilder
1014 {
1015     void buildAttribute(Effect* effect, Pass* pass, const SGPropertyNode* prop,
1016                         const SGReaderWriterXMLOptions* options)
1017     {
1018         if (!isAttributeActive(effect, prop))
1019             return;
1020         ref_ptr<Depth> depth = new Depth;
1021         const SGPropertyNode* pfunc
1022             = getEffectPropertyChild(effect, prop, "function");
1023         if (pfunc) {
1024             Depth::Function func = Depth::LESS;
1025             findAttr(depthFunction, pfunc, func);
1026             depth->setFunction(func);
1027         }
1028         const SGPropertyNode* pnear
1029             = getEffectPropertyChild(effect, prop, "near");
1030         if (pnear)
1031             depth->setZNear(pnear->getValue<double>());
1032         const SGPropertyNode* pfar
1033             = getEffectPropertyChild(effect, prop, "far");
1034         if (pfar)
1035             depth->setZFar(pnear->getValue<double>());
1036         const SGPropertyNode* pmask
1037             = getEffectPropertyChild(effect, prop, "write-mask");
1038         if (pmask)
1039             depth->setWriteMask(pmask->getValue<bool>());
1040         pass->setAttribute(depth.get());
1041     }
1042 };
1043
1044 InstallAttributeBuilder<DepthBuilder> installDepth("depth");
1045
1046 void buildTechnique(Effect* effect, const SGPropertyNode* prop,
1047                     const SGReaderWriterXMLOptions* options)
1048 {
1049     Technique* tniq = new Technique;
1050     effect->techniques.push_back(tniq);
1051     const SGPropertyNode* predProp = prop->getChild("predicate");
1052     if (!predProp) {
1053         tniq->setAlwaysValid(true);
1054     } else {
1055         try {
1056             TechniquePredParser parser;
1057             parser.setTechnique(tniq);
1058             expression::BindingLayout& layout = parser.getBindingLayout();
1059             /*int contextLoc = */layout.addBinding("__contextId", expression::INT);
1060             SGExpressionb* validExp
1061                 = dynamic_cast<SGExpressionb*>(parser.read(predProp
1062                                                            ->getChild(0)));
1063             if (validExp)
1064                 tniq->setValidExpression(validExp, layout);
1065             else
1066                 throw expression::ParseError("technique predicate is not a boolean expression");
1067         }
1068         catch (expression::ParseError& except)
1069         {
1070             SG_LOG(SG_INPUT, SG_ALERT,
1071                    "parsing technique predicate " << except.getMessage());
1072             tniq->setAlwaysValid(false);
1073         }
1074     }
1075     PropertyList passProps = prop->getChildren("pass");
1076     for (PropertyList::iterator itr = passProps.begin(), e = passProps.end();
1077          itr != e;
1078          ++itr) {
1079         buildPass(effect, tniq, itr->ptr(), options);
1080     }
1081 }
1082
1083 // Specifically for .ac files...
1084 bool makeParametersFromStateSet(SGPropertyNode* effectRoot, const StateSet* ss)
1085 {
1086     SGPropertyNode* paramRoot = makeChild(effectRoot, "parameters");
1087     SGPropertyNode* matNode = paramRoot->getChild("material", 0, true);
1088     Vec4f ambVal, difVal, specVal, emisVal;
1089     float shininess = 0.0f;
1090     const Material* mat = getStateAttribute<Material>(ss);
1091     if (mat) {
1092         ambVal = mat->getAmbient(Material::FRONT_AND_BACK);
1093         difVal = mat->getDiffuse(Material::FRONT_AND_BACK);
1094         specVal = mat->getSpecular(Material::FRONT_AND_BACK);
1095         emisVal = mat->getEmission(Material::FRONT_AND_BACK);
1096         shininess = mat->getShininess(Material::FRONT_AND_BACK);
1097         makeChild(matNode, "active")->setValue(true);
1098         makeChild(matNode, "ambient")->setValue(toVec4d(toSG(ambVal)));
1099         makeChild(matNode, "diffuse")->setValue(toVec4d(toSG(difVal)));
1100         makeChild(matNode, "specular")->setValue(toVec4d(toSG(specVal)));
1101         makeChild(matNode, "emissive")->setValue(toVec4d(toSG(emisVal)));
1102         makeChild(matNode, "shininess")->setValue(shininess);
1103         matNode->getChild("color-mode", 0, true)->setStringValue("diffuse");
1104     } else {
1105         makeChild(matNode, "active")->setValue(false);
1106     }
1107     const ShadeModel* sm = getStateAttribute<ShadeModel>(ss);
1108     string shadeModelString("smooth");
1109     if (sm) {
1110         ShadeModel::Mode smMode = sm->getMode();
1111         if (smMode == ShadeModel::FLAT)
1112             shadeModelString = "flat";
1113     }
1114     makeChild(paramRoot, "shade-model")->setStringValue(shadeModelString);
1115     string cullFaceString("off");
1116     const CullFace* cullFace = getStateAttribute<CullFace>(ss);
1117     if (cullFace) {
1118         switch (cullFace->getMode()) {
1119         case CullFace::FRONT:
1120             cullFaceString = "front";
1121             break;
1122         case CullFace::BACK:
1123             cullFaceString = "back";
1124             break;
1125         case CullFace::FRONT_AND_BACK:
1126             cullFaceString = "front-back";
1127             break;
1128         default:
1129             break;
1130         }
1131     }
1132     makeChild(paramRoot, "cull-face")->setStringValue(cullFaceString);
1133     const BlendFunc* blendFunc = getStateAttribute<BlendFunc>(ss);
1134     SGPropertyNode* blendNode = makeChild(paramRoot, "blend");
1135     if (blendFunc) {
1136         string sourceMode = findName(blendFuncModes, blendFunc->getSource());
1137         string destMode = findName(blendFuncModes, blendFunc->getDestination());
1138         makeChild(blendNode, "active")->setValue(true);
1139         makeChild(blendNode, "source")->setStringValue(sourceMode);
1140         makeChild(blendNode, "destination")->setStringValue(destMode);
1141         makeChild(blendNode, "mode")->setValue(true);
1142     } else {
1143         makeChild(blendNode, "active")->setValue(false);
1144     }
1145     string renderingHint = findName(renderingHints, ss->getRenderingHint());
1146     makeChild(paramRoot, "rendering-hint")->setStringValue(renderingHint);
1147     makeTextureParameters(paramRoot, ss);
1148     return true;
1149 }
1150
1151 // Walk the techniques property tree, building techniques and
1152 // passes.
1153 bool Effect::realizeTechniques(const SGReaderWriterXMLOptions* options)
1154 {
1155     if (_isRealized)
1156         return true;
1157     PropertyList tniqList = root->getChildren("technique");
1158     for (PropertyList::iterator itr = tniqList.begin(), e = tniqList.end();
1159          itr != e;
1160          ++itr)
1161         buildTechnique(this, *itr, options);
1162     _isRealized = true;
1163     return true;
1164 }
1165
1166 void Effect::InitializeCallback::doUpdate(osg::Node* node, osg::NodeVisitor* nv)
1167 {
1168     EffectGeode* eg = dynamic_cast<EffectGeode*>(node);
1169     if (!eg)
1170         return;
1171     Effect* effect = eg->getEffect();
1172     if (!effect)
1173         return;
1174     SGPropertyNode* root = getPropertyRoot();
1175     for (vector<SGSharedPtr<Updater> >::iterator itr = effect->_extraData.begin(),
1176              end = effect->_extraData.end();
1177          itr != end;
1178          ++itr) {
1179         InitializeWhenAdded* adder
1180             = dynamic_cast<InitializeWhenAdded*>(itr->ptr());
1181         if (adder)
1182             adder->initOnAdd(effect, root);
1183     }
1184 }
1185
1186 bool Effect::Key::EqualTo::operator()(const Effect::Key& lhs,
1187                                       const Effect::Key& rhs) const
1188 {
1189     if (lhs.paths.size() != rhs.paths.size()
1190         || !equal(lhs.paths.begin(), lhs.paths.end(), rhs.paths.begin()))
1191         return false;
1192     if (lhs.unmerged.valid() && rhs.unmerged.valid())
1193         return props::Compare()(lhs.unmerged, rhs.unmerged);
1194     else
1195         return lhs.unmerged == rhs.unmerged;
1196 }
1197
1198 size_t hash_value(const Effect::Key& key)
1199 {
1200     size_t seed = 0;
1201     if (key.unmerged.valid())
1202         boost::hash_combine(seed, *key.unmerged);
1203     boost::hash_range(seed, key.paths.begin(), key.paths.end());
1204     return seed;
1205 }
1206
1207 bool Effect_writeLocalData(const Object& obj, osgDB::Output& fw)
1208 {
1209     const Effect& effect = static_cast<const Effect&>(obj);
1210
1211     fw.indent() << "techniques " << effect.techniques.size() << "\n";
1212     BOOST_FOREACH(const ref_ptr<Technique>& technique, effect.techniques) {
1213         fw.writeObject(*technique);
1214     }
1215     return true;
1216 }
1217
1218 namespace
1219 {
1220 osgDB::RegisterDotOsgWrapperProxy effectProxy
1221 (
1222     new Effect,
1223     "simgear::Effect",
1224     "Object simgear::Effect",
1225     0,
1226     &Effect_writeLocalData
1227     );
1228 }
1229
1230 // Property expressions for technique predicates
1231 class PropertyExpression : public SGExpression<bool>
1232 {
1233 public:
1234     PropertyExpression(SGPropertyNode* pnode) : _pnode(pnode) {}
1235
1236     void eval(bool& value, const expression::Binding*) const
1237     {
1238         value = _pnode->getValue<bool>();
1239     }
1240 protected:
1241     SGPropertyNode_ptr _pnode;
1242 };
1243
1244 class EffectPropertyListener : public SGPropertyChangeListener
1245 {
1246 public:
1247     EffectPropertyListener(Technique* tniq) : _tniq(tniq) {}
1248
1249     void valueChanged(SGPropertyNode* node)
1250     {
1251         _tniq->refreshValidity();
1252     }
1253 protected:
1254     osg::ref_ptr<Technique> _tniq;
1255 };
1256
1257 Expression* propertyExpressionParser(const SGPropertyNode* exp,
1258                                      expression::Parser* parser)
1259 {
1260     SGPropertyNode_ptr pnode = getPropertyRoot()->getNode(exp->getStringValue(),
1261                                                           true);
1262     PropertyExpression* pexp = new PropertyExpression(pnode);
1263     TechniquePredParser* predParser
1264         = dynamic_cast<TechniquePredParser*>(parser);
1265     if (predParser)
1266         pnode->addChangeListener(new EffectPropertyListener(predParser
1267                                                             ->getTechnique()));
1268     return pexp;
1269 }
1270
1271 expression::ExpParserRegistrar propertyRegistrar("property",
1272                                                  propertyExpressionParser);
1273
1274 }