timoore
4b63bc051e
Stuart's new file SGTreeBin.hxx has been split into 4 files: TreeBin.[ch]xx and ShaderGeometry.[ch]xx.
270 lines
7.4 KiB
C++
270 lines
7.4 KiB
C++
// matmodel.cxx -- class to handle models tied to a material property
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//
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// Written by David Megginson, started May 1998.
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//
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// Copyright (C) 1998 - 2003 Curtis L. Olson - http://www.flightgear.org/~curt
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//
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// This program is free software; you can redistribute it and/or
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// modify it under the terms of the GNU General Public License as
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// published by the Free Software Foundation; either version 2 of the
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// License, or (at your option) any later version.
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//
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// This program is distributed in the hope that it will be useful, but
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// WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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// General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with this program; if not, write to the Free Software
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// Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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//
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// $Id$
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#ifdef HAVE_CONFIG_H
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# include <simgear_config.h>
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#endif
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#include <simgear/compiler.h>
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#include <map>
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SG_USING_STD(map);
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#include <osg/AlphaFunc>
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#include <osg/Group>
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#include <osg/LOD>
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#include <osg/StateSet>
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#include <osg/Transform>
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#ifdef SG_MATH_EXCEPTION_CLASH
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# include <math.h>
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#endif
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#include <simgear/debug/logstream.hxx>
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#include <simgear/math/sg_random.h>
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#include <simgear/misc/sg_path.hxx>
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#include <simgear/misc/sgstream.hxx>
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#include <simgear/scene/model/modellib.hxx>
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#include "matmodel.hxx"
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////////////////////////////////////////////////////////////////////////
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// Local static functions.
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////////////////////////////////////////////////////////////////////////
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/**
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* Internal method to test whether a file exists.
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*
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* TODO: this should be moved to a SimGear library of local file
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* functions.
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*/
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static inline bool
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local_file_exists( const string& path ) {
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sg_gzifstream in( path );
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if ( ! in.is_open() ) {
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return false;
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} else {
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return true;
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}
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}
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////////////////////////////////////////////////////////////////////////
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// Implementation of SGMatModel.
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////////////////////////////////////////////////////////////////////////
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SGMatModel::SGMatModel (const SGPropertyNode * node, double range_m)
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: _models_loaded(false),
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_coverage_m2(node->getDoubleValue("coverage-m2", 1000000)),
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_range_m(range_m)
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{
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// Sanity check
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if (_coverage_m2 < 1000) {
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SG_LOG(SG_INPUT, SG_ALERT, "Random object coverage " << _coverage_m2
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<< " is too small, forcing, to 1000");
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_coverage_m2 = 1000;
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}
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// Note all the model paths
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vector <SGPropertyNode_ptr> path_nodes = node->getChildren("path");
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for (unsigned int i = 0; i < path_nodes.size(); i++)
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_paths.push_back(path_nodes[i]->getStringValue());
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// Note the heading type
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string hdg = node->getStringValue("heading-type", "fixed");
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if (hdg == "fixed") {
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_heading_type = HEADING_FIXED;
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} else if (hdg == "billboard") {
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_heading_type = HEADING_BILLBOARD;
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} else if (hdg == "random") {
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_heading_type = HEADING_RANDOM;
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} else {
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_heading_type = HEADING_FIXED;
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SG_LOG(SG_INPUT, SG_ALERT, "Unknown heading type: " << hdg
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<< "; using 'fixed' instead.");
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}
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// uncomment to preload models
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// load_models();
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}
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SGMatModel::~SGMatModel ()
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{
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}
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int
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SGMatModel::get_model_count( SGModelLib *modellib,
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const string &fg_root,
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SGPropertyNode *prop_root,
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double sim_time_sec )
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{
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load_models( modellib, fg_root, prop_root, sim_time_sec );
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return _models.size();
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}
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inline void
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SGMatModel::load_models ( SGModelLib *modellib,
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const string &fg_root,
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SGPropertyNode *prop_root,
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double sim_time_sec )
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{
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// Load model only on demand
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if (!_models_loaded) {
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for (unsigned int i = 0; i < _paths.size(); i++) {
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osg::Node *entity = modellib->load_model( fg_root, _paths[i],
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prop_root, sim_time_sec,
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/*cache_object*/ true );
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if (entity != 0) {
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// FIXME: this stuff can be handled
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// in the XML wrapper as well (at least,
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// the billboarding should be handled
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// there).
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if (_heading_type == HEADING_BILLBOARD) {
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// if the model is a billboard, it is likely :
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// 1. a branch with only leaves,
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// 2. a tree or a non rectangular shape faked by transparency
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// We add alpha clamp then
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osg::StateSet* stateSet = entity->getOrCreateStateSet();
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osg::AlphaFunc* alphaFunc =
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new osg::AlphaFunc(osg::AlphaFunc::GREATER, 0.01f);
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stateSet->setAttributeAndModes(alphaFunc,
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osg::StateAttribute::OVERRIDE);
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stateSet->setRenderingHint(osg::StateSet::TRANSPARENT_BIN);
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}
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_models.push_back(entity);
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} else {
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SG_LOG(SG_INPUT, SG_ALERT, "Failed to load object " << _paths[i]);
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}
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}
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}
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_models_loaded = true;
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}
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osg::Node*
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SGMatModel::get_model( int index,
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SGModelLib *modellib,
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const string &fg_root,
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SGPropertyNode *prop_root,
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double sim_time_sec )
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{
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load_models( modellib, fg_root, prop_root, sim_time_sec ); // comment this out if preloading models
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return _models[index].get();
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}
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osg::Node*
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SGMatModel::get_random_model( SGModelLib *modellib,
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const string &fg_root,
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SGPropertyNode *prop_root,
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double sim_time_sec )
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{
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load_models( modellib, fg_root, prop_root, sim_time_sec ); // comment this out if preloading models
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int nModels = _models.size();
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int index = int(sg_random() * nModels);
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if (index >= nModels)
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index = 0;
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return _models[index].get();
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}
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double
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SGMatModel::get_coverage_m2 () const
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{
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return _coverage_m2;
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}
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double SGMatModel::get_range_m() const
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{
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return _range_m;
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}
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double SGMatModel::get_randomized_range_m(mt* seed) const
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{
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double lrand = mt_rand(seed);
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// Note that the LoD is not completely randomized.
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// 10% at 2 * range_m
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// 30% at 1.5 * range_m
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// 60% at 1 * range_m
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if (lrand < 0.1) return 2 * _range_m;
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if (lrand < 0.4) return 1.5 * _range_m;
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else return _range_m;
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}
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SGMatModel::HeadingType
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SGMatModel::get_heading_type () const
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{
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return _heading_type;
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}
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////////////////////////////////////////////////////////////////////////
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// Implementation of SGMatModelGroup.
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////////////////////////////////////////////////////////////////////////
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SGMatModelGroup::SGMatModelGroup (SGPropertyNode * node)
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: _range_m(node->getDoubleValue("range-m", 2000))
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{
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// Load the object subnodes
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vector<SGPropertyNode_ptr> object_nodes =
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((SGPropertyNode *)node)->getChildren("object");
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for (unsigned int i = 0; i < object_nodes.size(); i++) {
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const SGPropertyNode * object_node = object_nodes[i];
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if (object_node->hasChild("path"))
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_objects.push_back(new SGMatModel(object_node, _range_m));
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else
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SG_LOG(SG_INPUT, SG_ALERT, "No path supplied for object");
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}
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}
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SGMatModelGroup::~SGMatModelGroup ()
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{
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}
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double
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SGMatModelGroup::get_range_m () const
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{
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return _range_m;
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}
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int
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SGMatModelGroup::get_object_count () const
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{
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return _objects.size();
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}
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SGMatModel *
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SGMatModelGroup::get_object (int index) const
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{
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return _objects[index];
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}
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// end of matmodel.cxx
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