goat3d

annotate src/goat3d_readxml.cc @ 19:b35427826b60

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- added XML format reading support - wrote a rudimentary version of goatview
author John Tsiombikas <nuclear@member.fsf.org>
date Fri, 27 Sep 2013 06:58:37 +0300
parents
children 8da36540e2e9
rev   line source
nuclear@19 1 #include <stdio.h>
nuclear@19 2 #include "goat3d.h"
nuclear@19 3 #include "goat3d_impl.h"
nuclear@19 4 #include "tinyxml2.h"
nuclear@19 5 #include "log.h"
nuclear@19 6
nuclear@19 7 using namespace tinyxml2;
nuclear@19 8
nuclear@19 9 static Material *read_material(Scene *scn, XMLElement *xml_mtl);
nuclear@19 10 static const char *read_material_attrib(MaterialAttrib *attr, XMLElement *xml_attr);
nuclear@19 11 static Mesh *read_mesh(Scene *scn, XMLElement *xml_mesh);
nuclear@19 12 static std::string get_name(XMLElement *node, int idx);
nuclear@19 13
nuclear@19 14 bool Scene::loadxml(goat3d_io *io)
nuclear@19 15 {
nuclear@19 16 long bytes = io->seek(0, SEEK_END, io->cls);
nuclear@19 17 io->seek(0, SEEK_SET, io->cls);
nuclear@19 18
nuclear@19 19 char *buf = new char[bytes];
nuclear@19 20 if(io->read(buf, bytes, io->cls) < bytes) {
nuclear@19 21 logmsg(LOG_ERROR, "failed to read XML scene file\n");
nuclear@19 22 return false;
nuclear@19 23 }
nuclear@19 24
nuclear@19 25 XMLDocument xml;
nuclear@19 26 XMLError err = xml.Parse(buf, bytes);
nuclear@19 27 if(err) {
nuclear@19 28 logmsg(LOG_ERROR, "failed to parse XML scene file: %s\n%s\n", xml.GetErrorStr1(),
nuclear@19 29 xml.GetErrorStr2());
nuclear@19 30 return false;
nuclear@19 31 }
nuclear@19 32
nuclear@19 33 XMLElement *root = xml.RootElement();
nuclear@19 34 if(strcmp(root->Name(), "scene") != 0) {
nuclear@19 35 logmsg(LOG_ERROR, "invalid XML file, root node is not <scene>\n");
nuclear@19 36 return false;
nuclear@19 37 }
nuclear@19 38
nuclear@19 39 XMLElement *elem;
nuclear@19 40
nuclear@19 41 // get all materials
nuclear@19 42 elem = root->FirstChildElement("mtl");
nuclear@19 43 while(elem) {
nuclear@19 44 Material *mtl = read_material(this, elem);
nuclear@19 45 if(mtl) {
nuclear@19 46 add_material(mtl);
nuclear@19 47 }
nuclear@19 48 elem = elem->NextSiblingElement("mtl");
nuclear@19 49 }
nuclear@19 50
nuclear@19 51 // get all meshes
nuclear@19 52 elem = root->FirstChildElement("mesh");
nuclear@19 53 while(elem) {
nuclear@19 54 Mesh *mesh = read_mesh(this, elem);
nuclear@19 55 if(mesh) {
nuclear@19 56 add_mesh(mesh);
nuclear@19 57 }
nuclear@19 58 elem = elem->NextSiblingElement("mesh");
nuclear@19 59 }
nuclear@19 60
nuclear@19 61 return false;
nuclear@19 62 }
nuclear@19 63
nuclear@19 64
nuclear@19 65 static Material *read_material(Scene *scn, XMLElement *xml_mtl)
nuclear@19 66 {
nuclear@19 67 Material *mtl = new Material;
nuclear@19 68 mtl->name = get_name(xml_mtl, scn->get_material_count());
nuclear@19 69
nuclear@19 70 // get all the material attributes in turn
nuclear@19 71 XMLElement *elem = xml_mtl->FirstChildElement("attr");
nuclear@19 72 while(elem) {
nuclear@19 73 MaterialAttrib attr;
nuclear@19 74 const char *name = read_material_attrib(&attr, elem);
nuclear@19 75 if(name) {
nuclear@19 76 (*mtl)[name] = attr;
nuclear@19 77 }
nuclear@19 78
nuclear@19 79 elem = elem->NextSiblingElement("attr");
nuclear@19 80 }
nuclear@19 81
nuclear@19 82 return mtl;
nuclear@19 83 }
nuclear@19 84
nuclear@19 85 static const char *read_material_attrib(MaterialAttrib *attr, XMLElement *xml_attr)
nuclear@19 86 {
nuclear@19 87 const char *name;
nuclear@19 88
nuclear@19 89 XMLElement *elem;
nuclear@19 90 if((elem = xml_attr->FirstChildElement("name"))) {
nuclear@19 91 if(!(name = elem->Attribute("string"))) {
nuclear@19 92 return 0;
nuclear@19 93 }
nuclear@19 94 }
nuclear@19 95
nuclear@19 96 if((elem = xml_attr->FirstChildElement("val"))) {
nuclear@19 97 if(elem->QueryFloatAttribute("float", &attr->value.x) != XML_NO_ERROR) {
nuclear@19 98 // try a float3
nuclear@19 99 const char *valstr = elem->Attribute("float3");
nuclear@19 100 if(!valstr || sscanf(valstr, "%f %f %f", &attr->value.x, &attr->value.y,
nuclear@19 101 &attr->value.z) != 3) {
nuclear@19 102 // try a float4
nuclear@19 103 valstr = elem->Attribute("float4");
nuclear@19 104 if(!valstr || sscanf(valstr, "%f %f %f %f", &attr->value.x, &attr->value.y,
nuclear@19 105 &attr->value.z, &attr->value.w) != 4) {
nuclear@19 106 // no valid val attribute found
nuclear@19 107 return 0;
nuclear@19 108 }
nuclear@19 109 }
nuclear@19 110 }
nuclear@19 111 }
nuclear@19 112
nuclear@19 113 if((elem = xml_attr->FirstChildElement("map"))) {
nuclear@19 114 const char *tex = elem->Attribute("string");
nuclear@19 115 if(tex) {
nuclear@19 116 attr->map = std::string(tex);
nuclear@19 117 }
nuclear@19 118 }
nuclear@19 119
nuclear@19 120 return name;
nuclear@19 121 }
nuclear@19 122
nuclear@19 123 static Mesh *read_mesh(Scene *scn, XMLElement *xml_mesh)
nuclear@19 124 {
nuclear@19 125 Mesh *mesh = new Mesh;
nuclear@19 126 mesh->name = get_name(xml_mesh, scn->get_mesh_count());
nuclear@19 127
nuclear@19 128 XMLElement *elem;
nuclear@19 129 if((elem = xml_mesh->FirstChildElement("material"))) {
nuclear@19 130 int idx;
nuclear@19 131 if(elem->QueryIntAttribute("int", &idx) == XML_NO_ERROR) {
nuclear@19 132 mesh->material = scn->get_material(idx);
nuclear@19 133 } else {
nuclear@19 134 // try string
nuclear@19 135 const char *mtlstr = elem->Attribute("string");
nuclear@19 136 if(mtlstr) {
nuclear@19 137 mesh->material = scn->get_material(mtlstr);
nuclear@19 138 }
nuclear@19 139 }
nuclear@19 140 }
nuclear@19 141
nuclear@19 142 /* reading mesh data from XML is not supported, only MESH_FILE can be used to
nuclear@19 143 * specify an external mesh file to be loaded
nuclear@19 144 */
nuclear@19 145
nuclear@19 146 if((elem = xml_mesh->FirstChildElement("file"))) {
nuclear@19 147 const char *fname = elem->Attribute("string");
nuclear@19 148 if(fname) {
nuclear@19 149 if(!mesh->load(fname)) {
nuclear@19 150 delete mesh;
nuclear@19 151 return 0;
nuclear@19 152 }
nuclear@19 153 }
nuclear@19 154 }
nuclear@19 155
nuclear@19 156 return mesh;
nuclear@19 157 }
nuclear@19 158
nuclear@19 159 static std::string get_name(XMLElement *node, int idx)
nuclear@19 160 {
nuclear@19 161 char buf[64];
nuclear@19 162 const char *name = 0;
nuclear@19 163
nuclear@19 164 XMLElement *elem;
nuclear@19 165 if((elem = node->FirstChildElement("name"))) {
nuclear@19 166 name = elem->Attribute("string");
nuclear@19 167 }
nuclear@19 168
nuclear@19 169 if(!name) {
nuclear@19 170 sprintf(buf, "mesh%04d", idx);
nuclear@19 171 name = buf;
nuclear@19 172 }
nuclear@19 173
nuclear@19 174 return std::string(name);
nuclear@19 175 }