nuclear@54: /*
nuclear@54: goat3d - 3D scene, character, and animation file format library.
nuclear@54: Copyright (C) 2013-2014  John Tsiombikas <nuclear@member.fsf.org>
nuclear@54: 
nuclear@54: This program is free software: you can redistribute it and/or modify
nuclear@54: it under the terms of the GNU Lesser General Public License as published by
nuclear@54: the Free Software Foundation, either version 3 of the License, or
nuclear@54: (at your option) any later version.
nuclear@54: 
nuclear@54: This program is distributed in the hope that it will be useful,
nuclear@54: but WITHOUT ANY WARRANTY; without even the implied warranty of
nuclear@54: MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
nuclear@54: GNU Lesser General Public License for more details.
nuclear@54: 
nuclear@54: You should have received a copy of the GNU Lesser General Public License
nuclear@54: along with this program.  If not, see <http://www.gnu.org/licenses/>.
nuclear@54: */
nuclear@19: #include <stdio.h>
nuclear@75: #include <map>
nuclear@75: #include <string>
nuclear@95: #include <algorithm>
nuclear@19: #include "goat3d.h"
nuclear@19: #include "goat3d_impl.h"
nuclear@19: #include "tinyxml2.h"
nuclear@19: #include "log.h"
nuclear@19: 
nuclear@47: using namespace g3dimpl;
nuclear@19: using namespace tinyxml2;
nuclear@19: 
nuclear@95: struct Key {
nuclear@95: 	long tm;
nuclear@95: 	Vector4 val;
nuclear@95: };
nuclear@95: 
nuclear@95: static bool read_track(Scene *scn, XMLElement *xml_track, int *anim_idx);
nuclear@95: static Key read_key(XMLElement *xml_key);
nuclear@95: 
nuclear@19: static Material *read_material(Scene *scn, XMLElement *xml_mtl);
nuclear@19: static const char *read_material_attrib(MaterialAttrib *attr, XMLElement *xml_attr);
nuclear@19: static Mesh *read_mesh(Scene *scn, XMLElement *xml_mesh);
nuclear@75: static Node *read_node(Scene *scn, XMLElement *xml_node, std::map<Node*, std::string> &linkmap);
nuclear@75: static std::string get_name(XMLElement *node, int idx, const char *def_prefix);
nuclear@19: 
nuclear@19: bool Scene::loadxml(goat3d_io *io)
nuclear@19: {
nuclear@19: 	long bytes = io->seek(0, SEEK_END, io->cls);
nuclear@19: 	io->seek(0, SEEK_SET, io->cls);
nuclear@19: 
nuclear@19: 	char *buf = new char[bytes];
nuclear@19: 	if(io->read(buf, bytes, io->cls) < bytes) {
nuclear@19: 		logmsg(LOG_ERROR, "failed to read XML scene file\n");
nuclear@45: 		delete [] buf;
nuclear@19: 		return false;
nuclear@19: 	}
nuclear@19: 
nuclear@19: 	XMLDocument xml;
nuclear@19: 	XMLError err = xml.Parse(buf, bytes);
nuclear@19: 	if(err) {
nuclear@19: 		logmsg(LOG_ERROR, "failed to parse XML scene file: %s\n%s\n", xml.GetErrorStr1(),
nuclear@19: 				xml.GetErrorStr2());
nuclear@45: 		delete [] buf;
nuclear@19: 		return false;
nuclear@19: 	}
nuclear@19: 
nuclear@19: 	XMLElement *root = xml.RootElement();
nuclear@19: 	if(strcmp(root->Name(), "scene") != 0) {
nuclear@19: 		logmsg(LOG_ERROR, "invalid XML file, root node is not <scene>\n");
nuclear@45: 		delete [] buf;
nuclear@19: 		return false;
nuclear@19: 	}
nuclear@19: 
nuclear@19: 	XMLElement *elem;
nuclear@19: 
nuclear@19: 	// get all materials
nuclear@19: 	elem = root->FirstChildElement("mtl");
nuclear@19: 	while(elem) {
nuclear@19: 		Material *mtl = read_material(this, elem);
nuclear@19: 		if(mtl) {
nuclear@19: 			add_material(mtl);
nuclear@19: 		}
nuclear@19: 		elem = elem->NextSiblingElement("mtl");
nuclear@19: 	}
nuclear@19: 
nuclear@19: 	// get all meshes
nuclear@19: 	elem = root->FirstChildElement("mesh");
nuclear@19: 	while(elem) {
nuclear@19: 		Mesh *mesh = read_mesh(this, elem);
nuclear@19: 		if(mesh) {
nuclear@19: 			add_mesh(mesh);
nuclear@19: 		}
nuclear@19: 		elem = elem->NextSiblingElement("mesh");
nuclear@19: 	}
nuclear@19: 
nuclear@75: 	// get all nodes
nuclear@75: 	std::map<Node*, std::string> linkmap;
nuclear@75: 
nuclear@75: 	elem = root->FirstChildElement("node");
nuclear@75: 	while(elem) {
nuclear@75: 		Node *node = read_node(this, elem, linkmap);
nuclear@75: 		if(node) {
nuclear@75: 			add_node(node);
nuclear@75: 		}
nuclear@75: 		elem = elem->NextSiblingElement("node");
nuclear@75: 	}
nuclear@75: 
nuclear@75: 	// link up all the nodes in the hierarchy
nuclear@75: 	for(size_t i=0; i<nodes.size(); i++) {
nuclear@75: 		std::string parent_name = linkmap[nodes[i]];
nuclear@75: 		if(!parent_name.empty()) {
nuclear@75: 			Node *parent = get_node(parent_name.c_str());
nuclear@75: 			if(parent) {
nuclear@75: 				parent->add_child(nodes[i]);
nuclear@75: 			}
nuclear@75: 		}
nuclear@75: 	}
nuclear@75: 
nuclear@45: 	delete [] buf;
nuclear@45: 	return true;
nuclear@19: }
nuclear@19: 
nuclear@51: bool Scene::load_anim_xml(goat3d_io *io)
nuclear@51: {
nuclear@51: 	long bytes = io->seek(0, SEEK_END, io->cls);
nuclear@51: 	io->seek(0, SEEK_SET, io->cls);
nuclear@51: 
nuclear@51: 	char *buf = new char[bytes];
nuclear@51: 	if(io->read(buf, bytes, io->cls) < bytes) {
nuclear@51: 		logmsg(LOG_ERROR, "failed to read XML animation file\n");
nuclear@51: 		delete [] buf;
nuclear@51: 		return false;
nuclear@51: 	}
nuclear@51: 
nuclear@51: 	XMLDocument xml;
nuclear@51: 	XMLError err = xml.Parse(buf, bytes);
nuclear@51: 	if(err) {
nuclear@51: 		logmsg(LOG_ERROR, "failed to parse XML animation file: %s\n%s\n", xml.GetErrorStr1(),
nuclear@51: 				xml.GetErrorStr2());
nuclear@51: 		delete [] buf;
nuclear@51: 		return false;
nuclear@51: 	}
nuclear@51: 
nuclear@51: 	XMLElement *root = xml.RootElement();
nuclear@51: 	if(strcmp(root->Name(), "anim") != 0) {
nuclear@95: 		logmsg(LOG_ERROR, "%s: root node is not <anim>\n", __FUNCTION__);
nuclear@51: 		delete [] buf;
nuclear@51: 		return false;
nuclear@51: 	}
nuclear@51: 
nuclear@95: 	int anim_idx = -1;
nuclear@95: 	XMLElement *elem = root->FirstChildElement();
nuclear@51: 	while(elem) {
nuclear@51: 		const char *elem_name = elem->Name();
nuclear@51: 
nuclear@95: 		if(strcmp(elem_name, "track") != 0) {
nuclear@95: 			logmsg(LOG_ERROR, "%s: only <track>s allowed in <anim>\n", __FUNCTION__);
nuclear@95: 			delete [] buf;
nuclear@95: 			return false;
nuclear@95: 		}
nuclear@95: 
nuclear@95: 		if(!read_track(this, elem, &anim_idx)) {
nuclear@95: 			delete [] buf;
nuclear@95: 			return false;
nuclear@51: 		}
nuclear@51: 		elem = elem->NextSiblingElement();
nuclear@51: 	}
nuclear@51: 
nuclear@95: 	if(anim_idx == -1) {
nuclear@95: 		logmsg(LOG_INFO, "%s: WARNING animation affected 0 nodes\n", __FUNCTION__);
nuclear@95: 	}
nuclear@95: 
nuclear@51: 	delete [] buf;
nuclear@51: 	return true;
nuclear@51: }
nuclear@19: 
nuclear@95: static bool read_track(Scene *scn, XMLElement *xml_track, int *anim_idx)
nuclear@95: {
nuclear@95: 	Node *node = 0;
nuclear@95: 	int type = -1;
nuclear@95: 	std::vector<Key> keys;
nuclear@95: 
nuclear@95: 	XMLElement *elem = xml_track->FirstChildElement();
nuclear@95: 	while(elem) {
nuclear@95: 		const char *elem_name = elem->Name();
nuclear@95: 
nuclear@95: 		if(strcmp(elem_name, "node") == 0) {
nuclear@95: 			const char *name = elem->Attribute("string");
nuclear@95: 			if(!name || !(node = scn->get_node(name))) {
nuclear@95: 				logmsg(LOG_ERROR, "%s: invalid track node: %s\n", __FUNCTION__, name);
nuclear@95: 				return false;
nuclear@95: 			}
nuclear@95: 
nuclear@95: 		} else if(strcmp(elem_name, "attr") == 0) {
nuclear@95: 			const char *str = elem->Attribute("string");
nuclear@95: 			if(str && strcmp(str, "position") == 0) {
nuclear@95: 				type = XFormNode::POSITION_TRACK;
nuclear@95: 			} else if(str && strcmp(str, "rotation") == 0) {
nuclear@95: 				type = XFormNode::ROTATION_TRACK;
nuclear@95: 			} else if(str && strcmp(str, "scaling") == 0) {
nuclear@95: 				type = XFormNode::SCALING_TRACK;
nuclear@95: 			} else {
nuclear@95: 				logmsg(LOG_ERROR, "%s: invalid track attribute specifier: %s\n", __FUNCTION__, str);
nuclear@95: 				return false;
nuclear@95: 			}
nuclear@95: 
nuclear@95: 		} else if(strcmp(elem_name, "key") == 0) {
nuclear@95: 			Key key = read_key(elem);
nuclear@95: 			if(key.tm == LONG_MIN) {
nuclear@95: 				return false;	// logging in read_key
nuclear@95: 			}
nuclear@95: 			keys.push_back(key);
nuclear@95: 
nuclear@95: 		} else {
nuclear@95: 			logmsg(LOG_ERROR, "%s: unexpected element <%s> in <track>\n", __FUNCTION__, elem_name);
nuclear@95: 			return false;
nuclear@95: 		}
nuclear@95: 		elem = elem->NextSiblingElement();
nuclear@95: 	}
nuclear@95: 
nuclear@95: 	if(!node) {
nuclear@95: 		logmsg(LOG_ERROR, "%s: invalid track, missing node reference\n", __FUNCTION__);
nuclear@95: 		return false;
nuclear@95: 	}
nuclear@95: 	if(type == -1) {
nuclear@95: 		logmsg(LOG_ERROR, "%s: invalid track, missing attribute specifier\n", __FUNCTION__);
nuclear@95: 		return false;
nuclear@95: 	}
nuclear@95: 
nuclear@95: 	if(*anim_idx == -1) {
nuclear@95: 		// this is the first node we encounter. add a new animation and activate it
nuclear@95: 		XFormNode *root = node->get_root();
nuclear@95: 		*anim_idx = root->get_animation_count() + 1;
nuclear@95: 
nuclear@95: 		char name[64];
nuclear@95: 		sprintf(name, "anim%03d\n", *anim_idx);
nuclear@95: 		root->add_animation(name);
nuclear@95: 		root->use_animation(*anim_idx);
nuclear@95: 	} else {
nuclear@95: 		// make sure this node hierarchy already has this animation, otherwise add it
nuclear@95: 		XFormNode *root = node->get_root();
nuclear@95: 		if(root->get_active_animation_index() != *anim_idx) {
nuclear@95: 			char name[64];
nuclear@95: 			sprintf(name, "anim%03d\n", *anim_idx);
nuclear@95: 			root->add_animation(name);
nuclear@95: 			root->use_animation(*anim_idx);
nuclear@95: 		}
nuclear@95: 	}
nuclear@95: 
nuclear@96: 	for(size_t i=0; i<keys.size(); i++) {
nuclear@95: 		switch(type) {
nuclear@95: 		case XFormNode::POSITION_TRACK:
nuclear@96: 			node->set_position(Vector3(keys[i].val.x, keys[i].val.y, keys[i].val.z), keys[i].tm);
nuclear@95: 			break;
nuclear@95: 		case XFormNode::ROTATION_TRACK:
nuclear@96: 			node->set_rotation(Quaternion(keys[i].val.w, keys[i].val.x, keys[i].val.y, keys[i].val.z), keys[i].tm);
nuclear@95: 			break;
nuclear@95: 		case XFormNode::SCALING_TRACK:
nuclear@96: 			node->set_scaling(Vector3(keys[i].val.x, keys[i].val.y, keys[i].val.z), keys[i].tm);
nuclear@95: 		}
nuclear@95: 	}
nuclear@95: 	return true;
nuclear@95: }
nuclear@95: 
nuclear@95: static Key read_key(XMLElement *xml_key)
nuclear@95: {
nuclear@95: 	Key key;
nuclear@95: 	key.tm = LONG_MIN;	// initialize to invalid time
nuclear@95: 
nuclear@95: 	XMLElement *xml_time = xml_key->FirstChildElement("time");
nuclear@95: 	XMLElement *xml_value = xml_key->FirstChildElement("value");
nuclear@95: 
nuclear@95: 	if(!xml_time || !xml_value) {
nuclear@95: 		logmsg(LOG_ERROR, "%s: invalid key, missing either <time> or <value> elements\n", __FUNCTION__);
nuclear@95: 		return key;
nuclear@95: 	}
nuclear@95: 
nuclear@95: 	int ival;
nuclear@95: 	if(xml_time->QueryIntAttribute("int", &ival) != XML_NO_ERROR) {
nuclear@95: 		logmsg(LOG_ERROR, "%s: invalid time element in <key>\n", __FUNCTION__);
nuclear@95: 		return key;
nuclear@95: 	}
nuclear@95: 
nuclear@95: 	const char *vstr;
nuclear@95: 	if((vstr = xml_value->Attribute("float3"))) {
nuclear@95: 		if(sscanf(vstr, "%f %f %f", &key.val.x, &key.val.y, &key.val.z) != 3) {
nuclear@95: 			logmsg(LOG_ERROR, "%s: invalid float3 value element in <key>: %s\n", __FUNCTION__, vstr);
nuclear@95: 			return key;
nuclear@95: 		}
nuclear@95: 	} else if((vstr = xml_value->Attribute("float4"))) {
nuclear@95: 		if(sscanf(vstr, "%f %f %f %f", &key.val.x, &key.val.y, &key.val.z, &key.val.w) != 4) {
nuclear@95: 			logmsg(LOG_ERROR, "%s: invalid float4 value element in <key>: %s\n", __FUNCTION__, vstr);
nuclear@95: 			return key;
nuclear@95: 		}
nuclear@95: 	} else {
nuclear@95: 		logmsg(LOG_ERROR, "%s: invalid value element in <key>: missing float3 or float4 attributes\n", __FUNCTION__);
nuclear@95: 		return key;
nuclear@95: 	}
nuclear@95: 
nuclear@95: 	key.tm = ival;
nuclear@95: 	return key;
nuclear@95: }
nuclear@95: 
nuclear@19: static Material *read_material(Scene *scn, XMLElement *xml_mtl)
nuclear@19: {
nuclear@19: 	Material *mtl = new Material;
nuclear@75: 	mtl->name = get_name(xml_mtl, scn->get_material_count(), "material");
nuclear@19: 
nuclear@19: 	// get all the material attributes in turn
nuclear@19: 	XMLElement *elem = xml_mtl->FirstChildElement("attr");
nuclear@19: 	while(elem) {
nuclear@19: 		MaterialAttrib attr;
nuclear@19: 		const char *name = read_material_attrib(&attr, elem);
nuclear@19: 		if(name) {
nuclear@19: 			(*mtl)[name] = attr;
nuclear@19: 		}
nuclear@19: 
nuclear@19: 		elem = elem->NextSiblingElement("attr");
nuclear@19: 	}
nuclear@19: 
nuclear@19: 	return mtl;
nuclear@19: }
nuclear@19: 
nuclear@19: static const char *read_material_attrib(MaterialAttrib *attr, XMLElement *xml_attr)
nuclear@19: {
nuclear@94: 	const char *name = 0;
nuclear@19: 
nuclear@19: 	XMLElement *elem;
nuclear@19: 	if((elem = xml_attr->FirstChildElement("name"))) {
nuclear@19: 		if(!(name = elem->Attribute("string"))) {
nuclear@19: 			return 0;
nuclear@19: 		}
nuclear@19: 	}
nuclear@19: 
nuclear@19: 	if((elem = xml_attr->FirstChildElement("val"))) {
nuclear@19: 		if(elem->QueryFloatAttribute("float", &attr->value.x) != XML_NO_ERROR) {
nuclear@19: 			// try a float3
nuclear@19: 			const char *valstr = elem->Attribute("float3");
nuclear@19: 			if(!valstr || sscanf(valstr, "%f %f %f", &attr->value.x, &attr->value.y,
nuclear@19: 						&attr->value.z) != 3) {
nuclear@19: 				// try a float4
nuclear@19: 				valstr = elem->Attribute("float4");
nuclear@19: 				if(!valstr || sscanf(valstr, "%f %f %f %f", &attr->value.x, &attr->value.y,
nuclear@19: 							&attr->value.z, &attr->value.w) != 4) {
nuclear@19: 					// no valid val attribute found
nuclear@19: 					return 0;
nuclear@19: 				}
nuclear@19: 			}
nuclear@19: 		}
nuclear@19: 	}
nuclear@19: 
nuclear@19: 	if((elem = xml_attr->FirstChildElement("map"))) {
nuclear@19: 		const char *tex = elem->Attribute("string");
nuclear@19: 		if(tex) {
nuclear@19: 			attr->map = std::string(tex);
nuclear@19: 		}
nuclear@19: 	}
nuclear@19: 
nuclear@19: 	return name;
nuclear@19: }
nuclear@19: 
nuclear@19: static Mesh *read_mesh(Scene *scn, XMLElement *xml_mesh)
nuclear@19: {
nuclear@19: 	Mesh *mesh = new Mesh;
nuclear@75: 	mesh->name = get_name(xml_mesh, scn->get_mesh_count(), "mesh");
nuclear@19: 
nuclear@19: 	XMLElement *elem;
nuclear@19: 	if((elem = xml_mesh->FirstChildElement("material"))) {
nuclear@19: 		int idx;
nuclear@19: 		if(elem->QueryIntAttribute("int", &idx) == XML_NO_ERROR) {
nuclear@19: 			mesh->material = scn->get_material(idx);
nuclear@19: 		} else {
nuclear@19: 			// try string
nuclear@19: 			const char *mtlstr = elem->Attribute("string");
nuclear@19: 			if(mtlstr) {
nuclear@19: 				mesh->material = scn->get_material(mtlstr);
nuclear@19: 			}
nuclear@19: 		}
nuclear@19: 	}
nuclear@19: 
nuclear@19: 	/* reading mesh data from XML is not supported, only MESH_FILE can be used to
nuclear@19: 	 * specify an external mesh file to be loaded
nuclear@19: 	 */
nuclear@19: 
nuclear@19: 	if((elem = xml_mesh->FirstChildElement("file"))) {
nuclear@19: 		const char *fname = elem->Attribute("string");
nuclear@19: 		if(fname) {
nuclear@74: 			char *path = (char*)fname;
nuclear@74: 			if(scn->goat->search_path) {
nuclear@74: 				path = (char*)alloca(strlen(fname) + strlen(scn->goat->search_path) + 2);
nuclear@74: 				sprintf(path, "%s/%s", scn->goat->search_path, fname);
nuclear@74: 			}
nuclear@74: 			if(!mesh->load(path)) {
nuclear@19: 				delete mesh;
nuclear@19: 				return 0;
nuclear@19: 			}
nuclear@19: 		}
nuclear@19: 	}
nuclear@19: 
nuclear@19: 	return mesh;
nuclear@19: }
nuclear@19: 
nuclear@75: static Node *read_node(Scene *scn, XMLElement *xml_node, std::map<Node*, std::string> &linkmap)
nuclear@75: {
nuclear@75: 	Node *node = new Node;
nuclear@75: 	node->set_name(get_name(xml_node, scn->get_node_count(), "node").c_str());
nuclear@75: 
nuclear@75: 	XMLElement *elem;
nuclear@75: 	if((elem = xml_node->FirstChildElement("parent"))) {
nuclear@75: 		const char *pname = elem->Attribute("string");
nuclear@75: 		if(pname) {
nuclear@75: 			linkmap[node] = pname;
nuclear@75: 		}
nuclear@75: 	}
nuclear@75: 
nuclear@75: 	if((elem = xml_node->FirstChildElement("mesh"))) {
nuclear@75: 		Mesh *mesh = scn->get_mesh(elem->Attribute("string"));
nuclear@75: 		if(mesh) {
nuclear@75: 			node->set_object(mesh);
nuclear@75: 		}
nuclear@75: 	} else if((elem = xml_node->FirstChildElement("light"))) {
nuclear@75: 		Light *lt = scn->get_light(elem->Attribute("string"));
nuclear@75: 		if(lt) {
nuclear@75: 			node->set_object(lt);
nuclear@75: 		}
nuclear@75: 	} else if((elem = xml_node->FirstChildElement("camera"))) {
nuclear@75: 		Camera *cam = scn->get_camera(elem->Attribute("string"));
nuclear@75: 		if(cam) {
nuclear@75: 			node->set_object(cam);
nuclear@75: 		}
nuclear@75: 	}
nuclear@75: 
nuclear@75: 	float vec[4];
nuclear@75: 	if((elem = xml_node->FirstChildElement("pos"))) {
nuclear@75: 		const char *val = elem->Attribute("float3");
nuclear@75: 		if(val && sscanf(val, "%f %f %f", vec, vec + 1, vec + 2) == 3) {
nuclear@83: 			node->set_position(Vector3(vec[0], vec[1], vec[2]));
nuclear@75: 		} else {
nuclear@75: 			logmsg(LOG_ERROR, "node %s: invalid position tag\n", node->get_name());
nuclear@75: 		}
nuclear@75: 	}
nuclear@75: 	if((elem = xml_node->FirstChildElement("rot"))) {
nuclear@75: 		const char *val = elem->Attribute("float4");
nuclear@75: 		if(val && sscanf(val, "%f %f %f %f", vec, vec + 1, vec + 2, vec + 3) == 4) {
nuclear@75: 			node->set_rotation(Quaternion(vec[3], Vector3(vec[0], vec[1], vec[2])));
nuclear@75: 		} else {
nuclear@75: 			logmsg(LOG_ERROR, "node %s: invalid rotation tag\n", node->get_name());
nuclear@75: 		}
nuclear@75: 	}
nuclear@75: 	if((elem = xml_node->FirstChildElement("scale"))) {
nuclear@75: 		const char *val = elem->Attribute("float3");
nuclear@75: 		if(val && sscanf(val, "%f %f %f", vec, vec + 1, vec + 2) == 3) {
nuclear@75: 			node->set_scaling(Vector3(vec[0], vec[1], vec[2]));
nuclear@75: 		} else {
nuclear@75: 			logmsg(LOG_ERROR, "node %s: invalid scaling tag\n", node->get_name());
nuclear@75: 		}
nuclear@75: 	}
nuclear@75: 	if((elem = xml_node->FirstChildElement("pivot"))) {
nuclear@75: 		const char *val = elem->Attribute("float3");
nuclear@75: 		if(val && sscanf(val, "%f %f %f", vec, vec + 1, vec + 2) == 3) {
nuclear@75: 			node->set_pivot(Vector3(vec[0], vec[1], vec[2]));
nuclear@75: 		} else {
nuclear@75: 			logmsg(LOG_ERROR, "node %s: invalid pivot tag\n", node->get_name());
nuclear@75: 		}
nuclear@75: 	}
nuclear@75: 
nuclear@75: 	return node;
nuclear@75: }
nuclear@75: 
nuclear@75: static std::string get_name(XMLElement *node, int idx, const char *def_prefix)
nuclear@19: {
nuclear@19: 	char buf[64];
nuclear@19: 	const char *name = 0;
nuclear@19: 
nuclear@19: 	XMLElement *elem;
nuclear@19: 	if((elem = node->FirstChildElement("name"))) {
nuclear@19: 		name = elem->Attribute("string");
nuclear@19: 	}
nuclear@19: 
nuclear@19: 	if(!name) {
nuclear@75: 		sprintf(buf, "%s%04d", def_prefix, idx);
nuclear@19: 		name = buf;
nuclear@19: 	}
nuclear@19: 
nuclear@19: 	return std::string(name);
nuclear@19: }