349 lines
16 KiB
C++
349 lines
16 KiB
C++
/*******************************************************
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Lightwave Object Loader for OSG
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Copyright (C) 2004 Marco Jez <marco.jez@poste.it>
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OpenSceneGraph is (C) 2004 Robert Osfield
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********************************************************/
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#include "Surface.h"
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#include <osg/Material>
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#include <osg/CullFace>
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#include <osg/Texture2D>
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#include <osg/TexEnvCombine>
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#include <osg/TexGen>
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#include <osg/BlendFunc>
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#include <osg/Notify>
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#include <osgFX/SpecularHighlights>
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#include <osgDB/ReadFile>
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using namespace lwosg;
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namespace
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{
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osg::Texture::WrapMode osg_wrap_mode(Image_map::Wrap_type w)
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{
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switch (w) {
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case Image_map::RESET: return osg::Texture::CLAMP;
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case Image_map::REPEAT: return osg::Texture::REPEAT;
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case Image_map::MIRROR: return osg::Texture::MIRROR;
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case Image_map::EDGE: return osg::Texture::CLAMP_TO_EDGE;
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default: return osg::Texture::REPEAT;
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};
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}
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}
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Surface::Surface()
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: base_color_(0.784f, 0.784f, 0.784f),
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diffuse_(1.0f),
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luminosity_(0),
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specularity_(0),
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reflection_(0),
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transparency_(0),
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translucency_(0),
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glossiness_(0.4f),
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sidedness_(FRONT_ONLY),
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max_smoothing_angle_(0)
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{
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}
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Surface::Surface(const lwo2::FORM::SURF *surf, const Clip_map &clips)
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: base_color_(0.784f, 0.784f, 0.784f),
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diffuse_(1.0f),
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luminosity_(0),
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specularity_(0),
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reflection_(0),
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transparency_(0),
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translucency_(0),
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glossiness_(0.4f),
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sidedness_(FRONT_ONLY),
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max_smoothing_angle_(0)
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{
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compile(surf, clips);
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}
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void Surface::compile(const lwo2::FORM::SURF *surf, const Clip_map &clips)
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{
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// invalidate the stateset so it will be rebuilt
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stateset_ = 0;
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name_ = surf->name;
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for (iff::Chunk_list::const_iterator j=surf->attributes.begin(); j!=surf->attributes.end(); ++j) {
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const lwo2::FORM::SURF::COLR *colr = dynamic_cast<const lwo2::FORM::SURF::COLR *>(*j);
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if (colr) base_color_ = osg::Vec3(colr->base_color.red, colr->base_color.green, colr->base_color.blue);
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const lwo2::FORM::SURF::DIFF *diff = dynamic_cast<const lwo2::FORM::SURF::DIFF *>(*j);
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if (diff) diffuse_ = diff->intensity.fraction;
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const lwo2::FORM::SURF::LUMI *lumi = dynamic_cast<const lwo2::FORM::SURF::LUMI *>(*j);
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if (lumi) luminosity_ = lumi->intensity.fraction;
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const lwo2::FORM::SURF::SPEC *spec = dynamic_cast<const lwo2::FORM::SURF::SPEC *>(*j);
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if (spec) specularity_ = spec->intensity.fraction;
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const lwo2::FORM::SURF::REFL *refl = dynamic_cast<const lwo2::FORM::SURF::REFL *>(*j);
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if (refl) reflection_ = refl->intensity.fraction;
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const lwo2::FORM::SURF::TRAN *tran = dynamic_cast<const lwo2::FORM::SURF::TRAN *>(*j);
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if (tran) transparency_ = tran->intensity.fraction;
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const lwo2::FORM::SURF::TRNL *trnl = dynamic_cast<const lwo2::FORM::SURF::TRNL *>(*j);
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if (trnl) translucency_ = trnl->intensity.fraction;
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const lwo2::FORM::SURF::GLOS *glos = dynamic_cast<const lwo2::FORM::SURF::GLOS *>(*j);
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if (glos) glossiness_ = glos->glossiness.fraction;
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const lwo2::FORM::SURF::SIDE *side = dynamic_cast<const lwo2::FORM::SURF::SIDE *>(*j);
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if (side) sidedness_ = static_cast<Sidedness>(side->sidedness);
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const lwo2::FORM::SURF::SMAN *sman = dynamic_cast<const lwo2::FORM::SURF::SMAN *>(*j);
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if (sman) max_smoothing_angle_ = sman->max_smoothing_angle.radians;
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const lwo2::FORM::SURF::VCOL *vcol = dynamic_cast<const lwo2::FORM::SURF::VCOL *>(*j);
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if (vcol) {
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color_map_intensity_ = vcol->intensity.fraction;
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color_map_type_ = std::string(vcol->vmap_type.id, 4);
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color_map_name_ = vcol->name;
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}
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const lwo2::FORM::SURF::BLOK *blok = dynamic_cast<const lwo2::FORM::SURF::BLOK *>(*j);
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if (blok) {
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Block new_block(blok);
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if (new_block.get_type() == "IMAP") {
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Clip_map::const_iterator i = clips.find(new_block.get_image_map().image_map);
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if (i != clips.end()) {
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new_block.get_image_map().clip = &i->second;
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} else {
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osg::notify(osg::WARN) << "Warning: lwosg::Surface: cannot find clip number " << new_block.get_image_map().image_map << std::endl;
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}
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}
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blocks_.insert(Block_map::value_type(new_block.get_ordinal(), new_block));
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}
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}
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}
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void Surface::generate_stateset(int max_tex_units, bool force_arb_compression, const osgDB::ReaderWriter::Options* db_options) const
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{
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if (!stateset_.valid()) {
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stateset_ = new osg::StateSet;
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osg::ref_ptr<osg::Material> material = new osg::Material;
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material->setDiffuse(osg::Material::FRONT_AND_BACK, osg::Vec4(base_color_ * diffuse_, 1-transparency_));
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material->setAmbient(osg::Material::FRONT_AND_BACK, material->getDiffuse(osg::Material::FRONT_AND_BACK));
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material->setSpecular(osg::Material::FRONT_AND_BACK, osg::Vec4(specularity_, specularity_, specularity_, 1));
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material->setShininess(osg::Material::FRONT_AND_BACK, powf(2, 10 * glossiness_ + 2));
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material->setEmission(osg::Material::FRONT_AND_BACK, osg::Vec4(base_color_ * luminosity_, 1-transparency_));
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stateset_->setAttributeAndModes(material.get());
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if (!color_map_name_.empty()) {
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material->setColorMode(osg::Material::AMBIENT_AND_DIFFUSE);
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}
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if (transparency_ > 0) {
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osg::ref_ptr<osg::BlendFunc> bf = new osg::BlendFunc;
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bf->setFunction(osg::BlendFunc::SRC_ALPHA, osg::BlendFunc::ONE_MINUS_SRC_ALPHA);
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stateset_->setAttributeAndModes(bf.get());
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stateset_->setRenderingHint(osg::StateSet::TRANSPARENT_BIN);
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}
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if (sidedness_ == FRONT_AND_BACK) {
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stateset_->setMode(GL_CULL_FACE, osg::StateAttribute::OFF);
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} else {
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osg::ref_ptr<osg::CullFace> cf = new osg::CullFace;
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switch (sidedness_) {
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case NONE: cf->setMode(osg::CullFace::FRONT_AND_BACK); break;
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case FRONT_ONLY: cf->setMode(osg::CullFace::BACK); break;
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case BACK_ONLY: cf->setMode(osg::CullFace::FRONT); break;
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default: ;
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}
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stateset_->setAttributeAndModes(cf.get());
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}
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int unit = 0;
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for (Block_map::const_iterator i=blocks_.begin(); i!=blocks_.end(); ++i) {
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const Block &block = i->second;
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if (!block.enabled()) {
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continue;
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}
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if (block.get_type() == "IMAP") {
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if (block.get_channel() == "COLR") {
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if (block.get_image_map().clip) {
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std::string image_file = block.get_image_map().clip->get_still_filename();
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if (!image_file.empty()) {
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if (unit >= max_tex_units && max_tex_units > 0) {
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osg::notify(osg::WARN) << "Warning: lwosg::Surface: maximum number of texture units (" << max_tex_units << ") has been reached, skipping incoming blocks" << std::endl;
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break;
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}
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osg::ref_ptr<osg::Texture2D> texture = new osg::Texture2D;
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if (force_arb_compression)
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texture->setInternalFormatMode(osg::Texture::USE_ARB_COMPRESSION);
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texture->setImage(osgDB::readImageFile(image_file, db_options));
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texture->setWrap(osg::Texture::WRAP_S, osg_wrap_mode(block.get_image_map().width_wrap));
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texture->setWrap(osg::Texture::WRAP_T, osg_wrap_mode(block.get_image_map().height_wrap));
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texture->setFilter(osg::Texture::MIN_FILTER, osg::Texture::LINEAR_MIPMAP_LINEAR);
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texture->setFilter(osg::Texture::MAG_FILTER, osg::Texture::LINEAR);
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stateset_->setTextureAttributeAndModes(unit, texture.get());
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osg::ref_ptr<osg::TexEnvCombine> tec = new osg::TexEnvCombine;
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switch (block.get_opacity_type()) {
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case Block::NORMAL:
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{
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float s = block.get_opacity_amount();
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if (unit == 0) {
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tec->setCombine_RGB(osg::TexEnvCombine::MODULATE);
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osg::Vec3 color(diffuse_, diffuse_, diffuse_);
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color = color * s + base_color_ * (1 - s);
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material->setDiffuse(osg::Material::FRONT_AND_BACK, osg::Vec4(color, 1-transparency_));
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material->setAmbient(osg::Material::FRONT_AND_BACK, material->getDiffuse(osg::Material::FRONT_AND_BACK));
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material->setColorMode(osg::Material::OFF);
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} else {
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tec->setCombine_RGB(osg::TexEnvCombine::INTERPOLATE);
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tec->setConstantColor(osg::Vec4(s, s, s, s));
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}
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}
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break;
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case Block::ADDITIVE:
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tec->setCombine_RGB(osg::TexEnvCombine::ADD);
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break;
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case Block::SUBTRACTIVE:
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osg::notify(osg::WARN) << "Warning: lwosg::Surface: 'Subtractive' blending mode is not supported, falling back to 'Difference' mode" << std::endl;
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case Block::DIFFERENCE:
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tec->setCombine_RGB(osg::TexEnvCombine::SUBTRACT);
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break;
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case Block::MULTIPLY:
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tec->setCombine_RGB(osg::TexEnvCombine::MODULATE);
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break;
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case Block::DIVIDE:
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osg::notify(osg::WARN) << "Warning: lwosg::Surface: 'Divide' blending mode is not supported" << std::endl;
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break;
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case Block::ALPHA:
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osg::notify(osg::WARN) << "Warning: lwosg::Surface: 'Alpha' blending mode is not supported" << std::endl;
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break;
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case Block::TEXTURE_DISPLACEMENT:
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osg::notify(osg::WARN) << "Warning: lwosg::Surface: 'Texture Displacement' blending mode is not supported" << std::endl;
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break;
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default: ;
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};
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stateset_->setTextureAttributeAndModes(unit, tec.get());
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++unit;
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}
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}
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} else {
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osg::notify(osg::WARN) << "Warning: lwosg::Surface: texture channels of type '" << block.get_channel() << "' are not supported, this block will be ignored" << std::endl;
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}
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}
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}
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}
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}
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osg::Group *Surface::apply(osg::Geometry *geo, const VertexMap_map *texture_maps, const VertexMap_map *rgb_maps, const VertexMap_map *rgba_maps, int max_tex_units, bool use_osgfx, bool force_arb_compression, const VertexMap_binding_map &texmap_bindings, const osgDB::ReaderWriter::Options* db_options) const
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{
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int num_points = 0;
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if (geo->getVertexArray()) {
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num_points = static_cast<int>(geo->getVertexArray()->getNumElements());
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}
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generate_stateset(max_tex_units, force_arb_compression, db_options);
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geo->setStateSet(stateset_.get());
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int unit = 0;
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for (Block_map::const_iterator i=blocks_.begin(); i!=blocks_.end(); ++i) {
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const Block &block = i->second;
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if (block.get_type() == "IMAP" && block.get_channel() == "COLR" && block.get_image_map().clip) {
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std::string image_file = block.get_image_map().clip->get_still_filename();
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if (!image_file.empty()) {
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if (block.get_image_map().projection == Image_map::UV) {
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VertexMap_map::const_iterator i = texture_maps->find(block.get_image_map().uv_map);
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if (i != texture_maps->end()) {
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geo->setTexCoordArray(unit, i->second->asVec2Array(num_points));
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} else {
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osg::notify(osg::WARN) << "Warning: lwosg::Surface: surface '" << name_ << "' needs texture map named '" << block.get_image_map().uv_map << "' but I can't find it" << std::endl;
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}
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}
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++unit;
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}
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}
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}
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for (VertexMap_binding_map::const_iterator vi=texmap_bindings.begin(); vi!=texmap_bindings.end(); ++vi)
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{
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for (VertexMap_map::const_iterator j=texture_maps->begin(); j!=texture_maps->end(); ++j)
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{
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if (j->first == vi->first)
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{
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if (geo->getTexCoordArray(vi->second) != 0)
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{
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osg::notify(osg::WARN) << "Warning: lwosg::Surface: explicing binding of texture map '" << vi->first << "' to texunit " << vi->second << " will replace existing texture map" << std::endl;
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}
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geo->setTexCoordArray(vi->second, j->second->asVec2Array(num_points));
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}
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else
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{
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osg::notify(osg::WARN) << "Warning: lwosg::Surface: explicit binding of texture map '" << vi->first << "' to texunit " << vi->second << " was requested but there is no such map in this LWO file" << std::endl;
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}
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}
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}
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osg::Vec4 color = osg::Vec4(base_color_, 1-transparency_);
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const VertexMap_map *color_maps = 0;
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if (color_map_type_ == "RGB ") {
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color_maps = rgb_maps;
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}
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if (color_map_type_ == "RGBA") {
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color_maps = rgba_maps;
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}
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if (color_maps) {
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VertexMap_map::const_iterator i = color_maps->find(color_map_name_);
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if (i != color_maps->end() && !i->second->empty()) {
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geo->setColorArray(i->second->asVec4Array(num_points, color * color_map_intensity_, color * color_map_intensity_));
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geo->setColorBinding(osg::Geometry::BIND_PER_VERTEX);
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} else {
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osg::notify(osg::WARN) << "Warning: lwosg::Surface: surface '" << name_ << "' needs color map named '" << color_map_name_ << "' but I can't find it" << std::endl;
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}
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}
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// create osgFX specularity if needed
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if (use_osgfx && glossiness_ > 0 && specularity_ > 0) {
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if (unit >= max_tex_units && max_tex_units > 0) {
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osg::notify(osg::WARN) << "Warning: lwosg::Surface: can't apply osgFX specular lighting: maximum number of texture units (" << max_tex_units << ") has been reached" << std::endl;
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} else {
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osg::ref_ptr<osgFX::SpecularHighlights> sh = new osgFX::SpecularHighlights;
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sh->setTextureUnit(unit);
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osg::Material *material = dynamic_cast<osg::Material *>(stateset_->getAttribute(osg::StateAttribute::MATERIAL));
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if (material) {
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sh->setSpecularColor(material->getSpecular(osg::Material::FRONT_AND_BACK));
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sh->setSpecularExponent(powf(2, 10 * glossiness_ + 2));
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material->setSpecular(osg::Material::FRONT_AND_BACK, osg::Vec4(0, 0, 0, 0));
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material->setShininess(osg::Material::FRONT_AND_BACK, 0);
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}
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return sh.release();
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}
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}
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return 0;
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}
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