goat3d

annotate src/goat3d_readxml.cc @ 47:498ca7ac7047

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- placed all the implementation stuff in the g3dimpl namespace - added animation stuff to the public API - started writing animation saving/loading
author John Tsiombikas <nuclear@member.fsf.org>
date Sat, 28 Dec 2013 06:47:39 +0200
parents 8da36540e2e9
children 0be413ac2e0a fa5c52ea9d59
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@47 7 using namespace g3dimpl;
nuclear@19 8 using namespace tinyxml2;
nuclear@19 9
nuclear@19 10 static Material *read_material(Scene *scn, XMLElement *xml_mtl);
nuclear@19 11 static const char *read_material_attrib(MaterialAttrib *attr, XMLElement *xml_attr);
nuclear@19 12 static Mesh *read_mesh(Scene *scn, XMLElement *xml_mesh);
nuclear@19 13 static std::string get_name(XMLElement *node, int idx);
nuclear@19 14
nuclear@19 15 bool Scene::loadxml(goat3d_io *io)
nuclear@19 16 {
nuclear@19 17 long bytes = io->seek(0, SEEK_END, io->cls);
nuclear@19 18 io->seek(0, SEEK_SET, io->cls);
nuclear@19 19
nuclear@19 20 char *buf = new char[bytes];
nuclear@19 21 if(io->read(buf, bytes, io->cls) < bytes) {
nuclear@19 22 logmsg(LOG_ERROR, "failed to read XML scene file\n");
nuclear@45 23 delete [] buf;
nuclear@19 24 return false;
nuclear@19 25 }
nuclear@19 26
nuclear@19 27 XMLDocument xml;
nuclear@19 28 XMLError err = xml.Parse(buf, bytes);
nuclear@19 29 if(err) {
nuclear@19 30 logmsg(LOG_ERROR, "failed to parse XML scene file: %s\n%s\n", xml.GetErrorStr1(),
nuclear@19 31 xml.GetErrorStr2());
nuclear@45 32 delete [] buf;
nuclear@19 33 return false;
nuclear@19 34 }
nuclear@19 35
nuclear@19 36 XMLElement *root = xml.RootElement();
nuclear@19 37 if(strcmp(root->Name(), "scene") != 0) {
nuclear@19 38 logmsg(LOG_ERROR, "invalid XML file, root node is not <scene>\n");
nuclear@45 39 delete [] buf;
nuclear@19 40 return false;
nuclear@19 41 }
nuclear@19 42
nuclear@19 43 XMLElement *elem;
nuclear@19 44
nuclear@19 45 // get all materials
nuclear@19 46 elem = root->FirstChildElement("mtl");
nuclear@19 47 while(elem) {
nuclear@19 48 Material *mtl = read_material(this, elem);
nuclear@19 49 if(mtl) {
nuclear@19 50 add_material(mtl);
nuclear@19 51 }
nuclear@19 52 elem = elem->NextSiblingElement("mtl");
nuclear@19 53 }
nuclear@19 54
nuclear@19 55 // get all meshes
nuclear@19 56 elem = root->FirstChildElement("mesh");
nuclear@19 57 while(elem) {
nuclear@19 58 Mesh *mesh = read_mesh(this, elem);
nuclear@19 59 if(mesh) {
nuclear@19 60 add_mesh(mesh);
nuclear@19 61 }
nuclear@19 62 elem = elem->NextSiblingElement("mesh");
nuclear@19 63 }
nuclear@19 64
nuclear@45 65 delete [] buf;
nuclear@45 66 return true;
nuclear@19 67 }
nuclear@19 68
nuclear@19 69
nuclear@19 70 static Material *read_material(Scene *scn, XMLElement *xml_mtl)
nuclear@19 71 {
nuclear@19 72 Material *mtl = new Material;
nuclear@19 73 mtl->name = get_name(xml_mtl, scn->get_material_count());
nuclear@19 74
nuclear@19 75 // get all the material attributes in turn
nuclear@19 76 XMLElement *elem = xml_mtl->FirstChildElement("attr");
nuclear@19 77 while(elem) {
nuclear@19 78 MaterialAttrib attr;
nuclear@19 79 const char *name = read_material_attrib(&attr, elem);
nuclear@19 80 if(name) {
nuclear@19 81 (*mtl)[name] = attr;
nuclear@19 82 }
nuclear@19 83
nuclear@19 84 elem = elem->NextSiblingElement("attr");
nuclear@19 85 }
nuclear@19 86
nuclear@19 87 return mtl;
nuclear@19 88 }
nuclear@19 89
nuclear@19 90 static const char *read_material_attrib(MaterialAttrib *attr, XMLElement *xml_attr)
nuclear@19 91 {
nuclear@19 92 const char *name;
nuclear@19 93
nuclear@19 94 XMLElement *elem;
nuclear@19 95 if((elem = xml_attr->FirstChildElement("name"))) {
nuclear@19 96 if(!(name = elem->Attribute("string"))) {
nuclear@19 97 return 0;
nuclear@19 98 }
nuclear@19 99 }
nuclear@19 100
nuclear@19 101 if((elem = xml_attr->FirstChildElement("val"))) {
nuclear@19 102 if(elem->QueryFloatAttribute("float", &attr->value.x) != XML_NO_ERROR) {
nuclear@19 103 // try a float3
nuclear@19 104 const char *valstr = elem->Attribute("float3");
nuclear@19 105 if(!valstr || sscanf(valstr, "%f %f %f", &attr->value.x, &attr->value.y,
nuclear@19 106 &attr->value.z) != 3) {
nuclear@19 107 // try a float4
nuclear@19 108 valstr = elem->Attribute("float4");
nuclear@19 109 if(!valstr || sscanf(valstr, "%f %f %f %f", &attr->value.x, &attr->value.y,
nuclear@19 110 &attr->value.z, &attr->value.w) != 4) {
nuclear@19 111 // no valid val attribute found
nuclear@19 112 return 0;
nuclear@19 113 }
nuclear@19 114 }
nuclear@19 115 }
nuclear@19 116 }
nuclear@19 117
nuclear@19 118 if((elem = xml_attr->FirstChildElement("map"))) {
nuclear@19 119 const char *tex = elem->Attribute("string");
nuclear@19 120 if(tex) {
nuclear@19 121 attr->map = std::string(tex);
nuclear@19 122 }
nuclear@19 123 }
nuclear@19 124
nuclear@19 125 return name;
nuclear@19 126 }
nuclear@19 127
nuclear@19 128 static Mesh *read_mesh(Scene *scn, XMLElement *xml_mesh)
nuclear@19 129 {
nuclear@19 130 Mesh *mesh = new Mesh;
nuclear@19 131 mesh->name = get_name(xml_mesh, scn->get_mesh_count());
nuclear@19 132
nuclear@19 133 XMLElement *elem;
nuclear@19 134 if((elem = xml_mesh->FirstChildElement("material"))) {
nuclear@19 135 int idx;
nuclear@19 136 if(elem->QueryIntAttribute("int", &idx) == XML_NO_ERROR) {
nuclear@19 137 mesh->material = scn->get_material(idx);
nuclear@19 138 } else {
nuclear@19 139 // try string
nuclear@19 140 const char *mtlstr = elem->Attribute("string");
nuclear@19 141 if(mtlstr) {
nuclear@19 142 mesh->material = scn->get_material(mtlstr);
nuclear@19 143 }
nuclear@19 144 }
nuclear@19 145 }
nuclear@19 146
nuclear@19 147 /* reading mesh data from XML is not supported, only MESH_FILE can be used to
nuclear@19 148 * specify an external mesh file to be loaded
nuclear@19 149 */
nuclear@19 150
nuclear@19 151 if((elem = xml_mesh->FirstChildElement("file"))) {
nuclear@19 152 const char *fname = elem->Attribute("string");
nuclear@19 153 if(fname) {
nuclear@19 154 if(!mesh->load(fname)) {
nuclear@19 155 delete mesh;
nuclear@19 156 return 0;
nuclear@19 157 }
nuclear@19 158 }
nuclear@19 159 }
nuclear@19 160
nuclear@19 161 return mesh;
nuclear@19 162 }
nuclear@19 163
nuclear@19 164 static std::string get_name(XMLElement *node, int idx)
nuclear@19 165 {
nuclear@19 166 char buf[64];
nuclear@19 167 const char *name = 0;
nuclear@19 168
nuclear@19 169 XMLElement *elem;
nuclear@19 170 if((elem = node->FirstChildElement("name"))) {
nuclear@19 171 name = elem->Attribute("string");
nuclear@19 172 }
nuclear@19 173
nuclear@19 174 if(!name) {
nuclear@19 175 sprintf(buf, "mesh%04d", idx);
nuclear@19 176 name = buf;
nuclear@19 177 }
nuclear@19 178
nuclear@19 179 return std::string(name);
nuclear@19 180 }