goat3d: 45a9d493e98c src/goat3d

goat3d

view src/goat3d_readxml.cc @ 103:45a9d493e98c

fixed the input latency issue by calling QWidget::update() instead of QGLWidget::updateGL() update schedules an update instead of redrawing immediately.

author	John Tsiombikas <nuclear@member.fsf.org>
date	Sat, 12 Sep 2015 17:40:02 +0300
parents	da100bf13f7f
children

line source

1 /*

2 goat3d - 3D scene, character, and animation file format library.

5 This program is free software: you can redistribute it and/or modify

6 it under the terms of the GNU Lesser General Public License as published by

7 the Free Software Foundation, either version 3 of the License, or

8 (at your option) any later version.

10 This program is distributed in the hope that it will be useful,

11 but WITHOUT ANY WARRANTY; without even the implied warranty of

12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the

13 GNU Lesser General Public License for more details.

15 You should have received a copy of the GNU Lesser General Public License

16 along with this program. If not, see <http://www.gnu.org/licenses/>.

17 */

18 #include <stdio.h>

19 #include <map>

20 #include <string>

21 #include <algorithm>

22 #include "goat3d.h"

23 #include "goat3d_impl.h"

24 #include "tinyxml2.h"

25 #include "log.h"

27 using namespace g3dimpl;

28 using namespace tinyxml2;

30 struct Key {

31 long tm;

32 Vector4 val;

33 };

35 static bool read_track(Scene *scn, XMLElement *xml_track, int *anim_idx);

36 static Key read_key(XMLElement *xml_key);

38 static Material *read_material(Scene *scn, XMLElement *xml_mtl);

39 static const char *read_material_attrib(MaterialAttrib *attr, XMLElement *xml_attr);

40 static Mesh *read_mesh(Scene *scn, XMLElement *xml_mesh);

41 static Node *read_node(Scene *scn, XMLElement *xml_node, std::map<Node*, std::string> &linkmap);

42 static std::string get_name(XMLElement *node, int idx, const char *def_prefix);

44 bool Scene::loadxml(goat3d_io *io)

45 {

46 long bytes = io->seek(0, SEEK_END, io->cls);

47 io->seek(0, SEEK_SET, io->cls);

49 char *buf = new char[bytes];

50 if(io->read(buf, bytes, io->cls) < bytes) {

51 logmsg(LOG_ERROR, "failed to read XML scene file\n");

52 delete [] buf;

53 return false;

54 }

56 XMLDocument xml;

57 XMLError err = xml.Parse(buf, bytes);

58 if(err) {

59 logmsg(LOG_ERROR, "failed to parse XML scene file: %s\n%s\n", xml.GetErrorStr1(),

60 xml.GetErrorStr2());

61 delete [] buf;

62 return false;

63 }

65 XMLElement *root = xml.RootElement();

66 if(strcmp(root->Name(), "scene") != 0) {

67 logmsg(LOG_ERROR, "invalid XML file, root node is not <scene>\n");

68 delete [] buf;

69 return false;

70 }

72 XMLElement *elem;

74 // get all materials

75 elem = root->FirstChildElement("mtl");

76 while(elem) {

77 Material *mtl = read_material(this, elem);

78 if(mtl) {

79 add_material(mtl);

80 }

81 elem = elem->NextSiblingElement("mtl");

82 }

84 // get all meshes

85 elem = root->FirstChildElement("mesh");

86 while(elem) {

87 Mesh *mesh = read_mesh(this, elem);

88 if(mesh) {

89 add_mesh(mesh);

90 }

91 elem = elem->NextSiblingElement("mesh");

92 }

94 // get all nodes

95 std::map<Node*, std::string> linkmap;

97 elem = root->FirstChildElement("node");

98 while(elem) {

99 Node *node = read_node(this, elem, linkmap);

100 if(node) {

101 add_node(node);

102 }

103 elem = elem->NextSiblingElement("node");

104 }

105

106 // link up all the nodes in the hierarchy

107 for(size_t i=0; i<nodes.size(); i++) {

108 std::string parent_name = linkmap[nodes[i]];

109 if(!parent_name.empty()) {

110 Node *parent = get_node(parent_name.c_str());

111 if(parent) {

112 parent->add_child(nodes[i]);

113 }

114 }

115 }

116

117 delete [] buf;

118 return true;

119 }

120

121 bool Scene::load_anim_xml(goat3d_io *io)

122 {

123 long bytes = io->seek(0, SEEK_END, io->cls);

124 io->seek(0, SEEK_SET, io->cls);

125

126 char *buf = new char[bytes];

127 if(io->read(buf, bytes, io->cls) < bytes) {

128 logmsg(LOG_ERROR, "failed to read XML animation file\n");

129 delete [] buf;

130 return false;

131 }

132

133 XMLDocument xml;

134 XMLError err = xml.Parse(buf, bytes);

135 if(err) {

136 logmsg(LOG_ERROR, "failed to parse XML animation file: %s\n%s\n", xml.GetErrorStr1(),

137 xml.GetErrorStr2());

138 delete [] buf;

139 return false;

140 }

141

142 XMLElement *root = xml.RootElement();

143 if(strcmp(root->Name(), "anim") != 0) {

144 logmsg(LOG_ERROR, "%s: root node is not <anim>\n", __FUNCTION__);

145 delete [] buf;

146 return false;

147 }

148

149 int anim_idx = -1;

150 XMLElement *elem = root->FirstChildElement();

151 while(elem) {

152 const char *elem_name = elem->Name();

153

154 if(strcmp(elem_name, "track") != 0) {

155 logmsg(LOG_ERROR, "%s: only <track>s allowed in <anim>\n", __FUNCTION__);

156 delete [] buf;

157 return false;

158 }

159

160 if(!read_track(this, elem, &anim_idx)) {

161 delete [] buf;

162 return false;

163 }

164 elem = elem->NextSiblingElement();

165 }

166

167 if(anim_idx == -1) {

168 logmsg(LOG_INFO, "%s: WARNING animation affected 0 nodes\n", __FUNCTION__);

169 }

170

171 delete [] buf;

172 return true;

173 }

174

175 static bool read_track(Scene *scn, XMLElement *xml_track, int *anim_idx)

176 {

177 Node *node = 0;

178 int type = -1;

179 std::vector<Key> keys;

180

181 XMLElement *elem = xml_track->FirstChildElement();

182 while(elem) {

183 const char *elem_name = elem->Name();

184

185 if(strcmp(elem_name, "node") == 0) {

186 const char *name = elem->Attribute("string");

187 if(!name || !(node = scn->get_node(name))) {

188 logmsg(LOG_ERROR, "%s: invalid track node: %s\n", __FUNCTION__, name);

189 return false;

190 }

191

192 } else if(strcmp(elem_name, "attr") == 0) {

193 const char *str = elem->Attribute("string");

194 if(str && strcmp(str, "position") == 0) {

195 type = XFormNode::POSITION_TRACK;

196 } else if(str && strcmp(str, "rotation") == 0) {

197 type = XFormNode::ROTATION_TRACK;

198 } else if(str && strcmp(str, "scaling") == 0) {

199 type = XFormNode::SCALING_TRACK;

200 } else {

201 logmsg(LOG_ERROR, "%s: invalid track attribute specifier: %s\n", __FUNCTION__, str);

202 return false;

203 }

204

205 } else if(strcmp(elem_name, "key") == 0) {

206 Key key = read_key(elem);

207 if(key.tm == LONG_MIN) {

208 return false; // logging in read_key

209 }

210 keys.push_back(key);

211

212 } else {

213 logmsg(LOG_ERROR, "%s: unexpected element <%s> in <track>\n", __FUNCTION__, elem_name);

214 return false;

215 }

216 elem = elem->NextSiblingElement();

217 }

218

219 if(!node) {

220 logmsg(LOG_ERROR, "%s: invalid track, missing node reference\n", __FUNCTION__);

221 return false;

222 }

223 if(type == -1) {

224 logmsg(LOG_ERROR, "%s: invalid track, missing attribute specifier\n", __FUNCTION__);

225 return false;

226 }

227

228 if(*anim_idx == -1) {

229 // this is the first node we encounter. add a new animation and activate it

230 XFormNode *root = node->get_root();

231 *anim_idx = root->get_animation_count() + 1;

232

233 char name[64];

234 sprintf(name, "anim%03d\n", *anim_idx);

235 root->add_animation(name);

236 root->use_animation(*anim_idx);

237 } else {

238 // make sure this node hierarchy already has this animation, otherwise add it

239 XFormNode *root = node->get_root();

240 if(root->get_active_animation_index() != *anim_idx) {

241 char name[64];

242 sprintf(name, "anim%03d\n", *anim_idx);

243 root->add_animation(name);

244 root->use_animation(*anim_idx);

245 }

246 }

247

248 for(size_t i=0; i<keys.size(); i++) {

249 switch(type) {

250 case XFormNode::POSITION_TRACK:

251 node->set_position(Vector3(keys[i].val.x, keys[i].val.y, keys[i].val.z), keys[i].tm);

252 break;

253 case XFormNode::ROTATION_TRACK:

254 node->set_rotation(Quaternion(keys[i].val.w, keys[i].val.x, keys[i].val.y, keys[i].val.z), keys[i].tm);

255 break;

256 case XFormNode::SCALING_TRACK:

257 node->set_scaling(Vector3(keys[i].val.x, keys[i].val.y, keys[i].val.z), keys[i].tm);

258 }

259 }

260 return true;

261 }

262

263 static Key read_key(XMLElement *xml_key)

264 {

265 Key key;

266 key.tm = LONG_MIN; // initialize to invalid time

267

268 XMLElement *xml_time = xml_key->FirstChildElement("time");

269 XMLElement *xml_value = xml_key->FirstChildElement("value");

270

271 if(!xml_time || !xml_value) {

272 logmsg(LOG_ERROR, "%s: invalid key, missing either <time> or <value> elements\n", __FUNCTION__);

273 return key;

274 }

275

276 int ival;

277 if(xml_time->QueryIntAttribute("int", &ival) != XML_NO_ERROR) {

278 logmsg(LOG_ERROR, "%s: invalid time element in <key>\n", __FUNCTION__);

279 return key;

280 }

281

282 const char *vstr;

283 if((vstr = xml_value->Attribute("float3"))) {

284 if(sscanf(vstr, "%f %f %f", &key.val.x, &key.val.y, &key.val.z) != 3) {

285 logmsg(LOG_ERROR, "%s: invalid float3 value element in <key>: %s\n", __FUNCTION__, vstr);

286 return key;

287 }

288 } else if((vstr = xml_value->Attribute("float4"))) {

289 if(sscanf(vstr, "%f %f %f %f", &key.val.x, &key.val.y, &key.val.z, &key.val.w) != 4) {

290 logmsg(LOG_ERROR, "%s: invalid float4 value element in <key>: %s\n", __FUNCTION__, vstr);

291 return key;

292 }

293 } else {

294 logmsg(LOG_ERROR, "%s: invalid value element in <key>: missing float3 or float4 attributes\n", __FUNCTION__);

295 return key;

296 }

297

298 key.tm = ival;

299 return key;

300 }

301

302 static Material *read_material(Scene *scn, XMLElement *xml_mtl)

303 {

304 Material *mtl = new Material;

305 mtl->name = get_name(xml_mtl, scn->get_material_count(), "material");

306

307 // get all the material attributes in turn

308 XMLElement *elem = xml_mtl->FirstChildElement("attr");

309 while(elem) {

310 MaterialAttrib attr;

311 const char *name = read_material_attrib(&attr, elem);

312 if(name) {

313 (*mtl)[name] = attr;

314 }

315

316 elem = elem->NextSiblingElement("attr");

317 }

318

319 return mtl;

320 }

321

322 static const char *read_material_attrib(MaterialAttrib *attr, XMLElement *xml_attr)

323 {

324 const char *name = 0;

325

326 XMLElement *elem;

327 if((elem = xml_attr->FirstChildElement("name"))) {

328 if(!(name = elem->Attribute("string"))) {

329 return 0;

330 }

331 }

332

333 if((elem = xml_attr->FirstChildElement("val"))) {

334 if(elem->QueryFloatAttribute("float", &attr->value.x) != XML_NO_ERROR) {

335 // try a float3

336 const char *valstr = elem->Attribute("float3");

337 if(!valstr || sscanf(valstr, "%f %f %f", &attr->value.x, &attr->value.y,

338 &attr->value.z) != 3) {

339 // try a float4

340 valstr = elem->Attribute("float4");

341 if(!valstr || sscanf(valstr, "%f %f %f %f", &attr->value.x, &attr->value.y,

342 &attr->value.z, &attr->value.w) != 4) {

343 // no valid val attribute found

344 return 0;

345 }

346 }

347 }

348 }

349

350 if((elem = xml_attr->FirstChildElement("map"))) {

351 const char *tex = elem->Attribute("string");

352 if(tex) {

353 attr->map = std::string(tex);

354 }

355 }

356

357 return name;

358 }

359

360 static Mesh *read_mesh(Scene *scn, XMLElement *xml_mesh)

361 {

362 Mesh *mesh = new Mesh;

363 mesh->name = get_name(xml_mesh, scn->get_mesh_count(), "mesh");

364

365 XMLElement *elem;

366 if((elem = xml_mesh->FirstChildElement("material"))) {

367 int idx;

368 if(elem->QueryIntAttribute("int", &idx) == XML_NO_ERROR) {

369 mesh->material = scn->get_material(idx);

370 } else {

371 // try string

372 const char *mtlstr = elem->Attribute("string");

373 if(mtlstr) {

374 mesh->material = scn->get_material(mtlstr);

375 }

376 }

377 }

378

379 /* reading mesh data from XML is not supported, only MESH_FILE can be used to

380 * specify an external mesh file to be loaded

381 */

382

383 if((elem = xml_mesh->FirstChildElement("file"))) {

384 const char *fname = elem->Attribute("string");

385 if(fname) {

386 char *path = (char*)fname;

387 if(scn->goat->search_path) {

388 path = (char*)alloca(strlen(fname) + strlen(scn->goat->search_path) + 2);

389 sprintf(path, "%s/%s", scn->goat->search_path, fname);

390 }

391 if(!mesh->load(path)) {

392 delete mesh;

393 return 0;

394 }

395 }

396 }

397

398 return mesh;

399 }

400

401 static Node *read_node(Scene *scn, XMLElement *xml_node, std::map<Node*, std::string> &linkmap)

402 {

403 Node *node = new Node;

404 node->set_name(get_name(xml_node, scn->get_node_count(), "node").c_str());

405

406 XMLElement *elem;

407 if((elem = xml_node->FirstChildElement("parent"))) {

408 const char *pname = elem->Attribute("string");

409 if(pname) {

410 linkmap[node] = pname;

411 }

412 }

413

414 if((elem = xml_node->FirstChildElement("mesh"))) {

415 Mesh *mesh = scn->get_mesh(elem->Attribute("string"));

416 if(mesh) {

417 node->set_object(mesh);

418 }

419 } else if((elem = xml_node->FirstChildElement("light"))) {

420 Light *lt = scn->get_light(elem->Attribute("string"));

421 if(lt) {

422 node->set_object(lt);

423 }

424 } else if((elem = xml_node->FirstChildElement("camera"))) {

425 Camera *cam = scn->get_camera(elem->Attribute("string"));

426 if(cam) {

427 node->set_object(cam);

428 }

429 }

430

431 float vec[4];

432 if((elem = xml_node->FirstChildElement("pos"))) {

433 const char *val = elem->Attribute("float3");

434 if(val && sscanf(val, "%f %f %f", vec, vec + 1, vec + 2) == 3) {

435 node->set_position(Vector3(vec[0], vec[1], vec[2]));

436 } else {

437 logmsg(LOG_ERROR, "node %s: invalid position tag\n", node->get_name());

438 }

439 }

440 if((elem = xml_node->FirstChildElement("rot"))) {

441 const char *val = elem->Attribute("float4");

442 if(val && sscanf(val, "%f %f %f %f", vec, vec + 1, vec + 2, vec + 3) == 4) {

443 node->set_rotation(Quaternion(vec[3], Vector3(vec[0], vec[1], vec[2])));

444 } else {

445 logmsg(LOG_ERROR, "node %s: invalid rotation tag\n", node->get_name());

446 }

447 }

448 if((elem = xml_node->FirstChildElement("scale"))) {

449 const char *val = elem->Attribute("float3");

450 if(val && sscanf(val, "%f %f %f", vec, vec + 1, vec + 2) == 3) {

451 node->set_scaling(Vector3(vec[0], vec[1], vec[2]));

452 } else {

453 logmsg(LOG_ERROR, "node %s: invalid scaling tag\n", node->get_name());

454 }

455 }

456 if((elem = xml_node->FirstChildElement("pivot"))) {

457 const char *val = elem->Attribute("float3");

458 if(val && sscanf(val, "%f %f %f", vec, vec + 1, vec + 2) == 3) {

459 node->set_pivot(Vector3(vec[0], vec[1], vec[2]));

460 } else {

461 logmsg(LOG_ERROR, "node %s: invalid pivot tag\n", node->get_name());

462 }

463 }

464

465 return node;

466 }

467

468 static std::string get_name(XMLElement *node, int idx, const char *def_prefix)

469 {

470 char buf[64];

471 const char *name = 0;

472

473 XMLElement *elem;

474 if((elem = node->FirstChildElement("name"))) {

475 name = elem->Attribute("string");

476 }

477

478 if(!name) {

479 sprintf(buf, "%s%04d", def_prefix, idx);

480 name = buf;

481 }

482

483 return std::string(name);

484 }