goat3d: 0e48907847ad src/goat3d.cc

goat3d

view src/goat3d.cc @ 39:0e48907847ad

slugishly progressing with the blender exporter

author	John Tsiombikas <nuclear@member.fsf.org>
date	Wed, 09 Oct 2013 16:40:59 +0300
parents	4058337fbb92
children	a5c5cec3cb88

line source

1 #include <string.h>

2 #include <errno.h>

3 #include <ctype.h>

4 #include <string>

5 #include "goat3d.h"

6 #include "goat3d_impl.h"

7 #include "log.h"

9 #ifndef _MSC_VER

10 #include <alloca.h>

11 #else

12 #include <malloc.h>

13 #endif

15 struct goat3d {

16 Scene *scn;

17 unsigned int flags;

18 char *search_path;

19 };

21 struct goat3d_material : public Material {};

22 struct goat3d_mesh : public Mesh {};

23 struct goat3d_light : public Light {};

24 struct goat3d_camera : public Camera {};

25 struct goat3d_node : public Node {};

28 static long read_file(void *buf, size_t bytes, void *uptr);

29 static long write_file(const void *buf, size_t bytes, void *uptr);

30 static long seek_file(long offs, int whence, void *uptr);

32 static std::string clean_filename(const char *str);

34 extern "C" {

36 struct goat3d *goat3d_create(void)

37 {

38 goat3d *goat = new goat3d;

39 goat->flags = 0;

40 goat->search_path = 0;

41 goat->scn = new Scene;

43 goat3d_setopt(goat, GOAT3D_OPT_SAVEXML, 1);

44 return goat;

45 }

47 void goat3d_free(struct goat3d *g)

48 {

49 delete g->search_path;

50 delete g->scn;

51 delete g;

52 }

54 void goat3d_setopt(struct goat3d *g, enum goat3d_option opt, int val)

55 {

56 if(val) {

57 g->flags |= (1 << (int)opt);

58 } else {

59 g->flags &= ~(1 << (int)opt);

60 }

61 }

63 int goat3d_getopt(const struct goat3d *g, enum goat3d_option opt)

64 {

65 return (g->flags >> (int)opt) & 1;

66 }

68 int goat3d_load(struct goat3d *g, const char *fname)

69 {

70 FILE *fp = fopen(fname, "rb");

71 if(!fp) {

72 logmsg(LOG_ERROR, "failed to open file \"%s\" for reading: %s\n", fname, strerror(errno));

73 return -1;

74 }

76 /* if the filename contained any directory components, keep the prefix

77 * to use it as a search path for external mesh file loading

78 */

79 g->search_path = new char[strlen(fname) + 1];

80 strcpy(g->search_path, fname);

82 char *slash = strrchr(g->search_path, '/');

83 if(slash) {

84 *slash = 0;

85 } else {

86 if((slash = strrchr(g->search_path, '\\'))) {

87 *slash = 0;

88 } else {

89 delete [] g->search_path;

90 g->search_path = 0;

91 }

92 }

94 int res = goat3d_load_file(g, fp);

95 fclose(fp);

96 return res;

97 }

99 int goat3d_save(const struct goat3d *g, const char *fname)

100 {

101 FILE *fp = fopen(fname, "wb");

102 if(!fp) {

103 logmsg(LOG_ERROR, "failed to open file \"%s\" for writing: %s\n", fname, strerror(errno));

104 return -1;

105 }

106

107 int res = goat3d_save_file(g, fp);

108 fclose(fp);

109 return res;

110 }

111

112 int goat3d_load_file(struct goat3d *g, FILE *fp)

113 {

114 goat3d_io io;

115 io.cls = fp;

116 io.read = read_file;

117 io.write = write_file;

118 io.seek = seek_file;

119

120 return goat3d_load_io(g, &io);

121 }

122

123 int goat3d_save_file(const struct goat3d *g, FILE *fp)

124 {

125 goat3d_io io;

126 io.cls = fp;

127 io.read = read_file;

128 io.write = write_file;

129 io.seek = seek_file;

130

131 return goat3d_save_io(g, &io);

132 }

133

134 int goat3d_load_io(struct goat3d *g, struct goat3d_io *io)

135 {

136 if(!g->scn->load(io)) {

137 if(g->scn->loadxml(io)) {

138 return -1;

139 }

140 }

141 return 0;

142 }

143

144 int goat3d_save_io(const struct goat3d *g, struct goat3d_io *io)

145 {

146 if(goat3d_getopt(g, GOAT3D_OPT_SAVEXML)) {

147 return g->scn->savexml(io) ? 0 : -1;

148 }

149 return g->scn->save(io) ? 0 : -1;

150 }

151

152 int goat3d_set_name(struct goat3d *g, const char *name)

153 {

154 g->scn->set_name(name);

155 return 0;

156 }

157

158 const char *goat3d_get_name(const struct goat3d *g)

159 {

160 return g->scn->get_name();

161 }

162

163 void goat3d_set_ambient(struct goat3d *g, const float *amb)

164 {

165 g->scn->set_ambient(Vector3(amb[0], amb[1], amb[2]));

166 }

167

168 void goat3d_set_ambient3f(struct goat3d *g, float ar, float ag, float ab)

169 {

170 g->scn->set_ambient(Vector3(ar, ag, ab));

171 }

172

173 const float *goat3d_get_ambient(const struct goat3d *g)

174 {

175 return &g->scn->get_ambient().x;

176 }

177

178 // ---- materials ----

179 void goat3d_add_mtl(struct goat3d *g, struct goat3d_material *mtl)

180 {

181 g->scn->add_material(mtl);

182 }

183

184 struct goat3d_material *goat3d_create_mtl(void)

185 {

186 return new goat3d_material;

187 }

188

189 void goat3d_destroy_mtl(struct goat3d_material *mtl)

190 {

191 delete mtl;

192 }

193

194 void goat3d_set_mtl_name(struct goat3d_material *mtl, const char *name)

195 {

196 mtl->name = std::string(name);

197 }

198

199 const char *goat3d_get_mtl_name(const struct goat3d_material *mtl)

200 {

201 return mtl->name.c_str();

202 }

203

204 void goat3d_set_mtl_attrib(struct goat3d_material *mtl, const char *attrib, const float *val)

205 {

206 (*mtl)[attrib].value = Vector4(val[0], val[1], val[2], val[3]);

207 }

208

209 void goat3d_set_mtl_attrib1f(struct goat3d_material *mtl, const char *attrib, float val)

210 {

211 goat3d_set_mtl_attrib4f(mtl, attrib, val, 0, 0, 1);

212 }

213

214 void goat3d_set_mtl_attrib3f(struct goat3d_material *mtl, const char *attrib, float r, float g, float b)

215 {

216 goat3d_set_mtl_attrib4f(mtl, attrib, r, g, b, 1);

217 }

218

219 void goat3d_set_mtl_attrib4f(struct goat3d_material *mtl, const char *attrib, float r, float g, float b, float a)

220 {

221 (*mtl)[attrib].value = Vector4(r, g, b, a);

222 }

223

224 const float *goat3d_get_mtl_attrib(struct goat3d_material *mtl, const char *attrib)

225 {

226 return &(*mtl)[attrib].value.x;

227 }

228

229 void goat3d_set_mtl_attrib_map(struct goat3d_material *mtl, const char *attrib, const char *mapname)

230 {

231 (*mtl)[attrib].map = clean_filename(mapname);

232 }

233

234 const char *goat3d_get_mtl_attrib_map(struct goat3d_material *mtl, const char *attrib)

235 {

236 return (*mtl)[attrib].map.c_str();

237 }

238

239 // ---- meshes ----

240 void goat3d_add_mesh(struct goat3d *g, struct goat3d_mesh *mesh)

241 {

242 g->scn->add_mesh(mesh);

243 }

244

245 int goat3d_get_mesh_count(struct goat3d *g)

246 {

247 return g->scn->get_mesh_count();

248 }

249

250 struct goat3d_mesh *goat3d_get_mesh(struct goat3d *g, int idx)

251 {

252 return (goat3d_mesh*)g->scn->get_mesh(idx);

253 }

254

255 struct goat3d_mesh *goat3d_get_mesh_by_name(struct goat3d *g, const char *name)

256 {

257 return (goat3d_mesh*)g->scn->get_mesh(name);

258 }

259

260 struct goat3d_mesh *goat3d_create_mesh(void)

261 {

262 return new goat3d_mesh;

263 }

264

265 void goat3d_destroy_mesh(struct goat3d_mesh *mesh)

266 {

267 delete mesh;

268 }

269

270 void goat3d_set_mesh_name(struct goat3d_mesh *mesh, const char *name)

271 {

272 mesh->name = std::string(name);

273 }

274

275 const char *goat3d_get_mesh_name(const struct goat3d_mesh *mesh)

276 {

277 return mesh->name.c_str();

278 }

279

280 void goat3d_set_mesh_mtl(struct goat3d_mesh *mesh, struct goat3d_material *mtl)

281 {

282 mesh->material = mtl;

283 }

284

285 struct goat3d_material *goat3d_get_mesh_mtl(struct goat3d_mesh *mesh)

286 {

287 return (goat3d_material*)mesh->material;

288 }

289

290 int goat3d_get_mesh_attrib_count(struct goat3d_mesh *mesh, enum goat3d_mesh_attrib attrib)

291 {

292 return (int)mesh->vertices.size();

293 }

294

295 int goat3d_get_mesh_face_count(struct goat3d_mesh *mesh)

296 {

297 return (int)mesh->faces.size();

298 }

299

300 // VECDATA is in goat3d_impl.h

301 void goat3d_set_mesh_attribs(struct goat3d_mesh *mesh, enum goat3d_mesh_attrib attrib, const void *data, int vnum)

302 {

303 if(attrib == GOAT3D_MESH_ATTR_VERTEX) {

304 mesh->vertices = VECDATA(Vector3, data, vnum);

305 return;

306 }

307

308 if(vnum != (int)mesh->vertices.size()) {

309 logmsg(LOG_ERROR, "trying to set mesh attrib data with number of elements different than the vertex array\n");

310 return;

311 }

312

313 switch(attrib) {

314 case GOAT3D_MESH_ATTR_NORMAL:

315 mesh->normals = VECDATA(Vector3, data, vnum);

316 break;

317 case GOAT3D_MESH_ATTR_TANGENT:

318 mesh->tangents = VECDATA(Vector3, data, vnum);

319 break;

320 case GOAT3D_MESH_ATTR_TEXCOORD:

321 mesh->texcoords = VECDATA(Vector2, data, vnum);

322 break;

323 case GOAT3D_MESH_ATTR_SKIN_WEIGHT:

324 mesh->skin_weights = VECDATA(Vector4, data, vnum);

325 break;

326 case GOAT3D_MESH_ATTR_SKIN_MATRIX:

327 mesh->skin_matrices = VECDATA(Int4, data, vnum);

328 break;

329 case GOAT3D_MESH_ATTR_COLOR:

330 mesh->colors = VECDATA(Vector4, data, vnum);

331 default:

332 break;

333 }

334 }

335

336 void *goat3d_get_mesh_attribs(struct goat3d_mesh *mesh, enum goat3d_mesh_attrib attrib)

337 {

338 return goat3d_get_mesh_attrib(mesh, attrib, 0);

339 }

340

341 void *goat3d_get_mesh_attrib(struct goat3d_mesh *mesh, enum goat3d_mesh_attrib attrib, int idx)

342 {

343 switch(attrib) {

344 case GOAT3D_MESH_ATTR_VERTEX:

345 return mesh->vertices.empty() ? 0 : (void*)&mesh->vertices[idx];

346 case GOAT3D_MESH_ATTR_NORMAL:

347 return mesh->normals.empty() ? 0 : (void*)&mesh->normals[idx];

348 case GOAT3D_MESH_ATTR_TANGENT:

349 return mesh->tangents.empty() ? 0 : (void*)&mesh->tangents[idx];

350 case GOAT3D_MESH_ATTR_TEXCOORD:

351 return mesh->texcoords.empty() ? 0 : (void*)&mesh->texcoords[idx];

352 case GOAT3D_MESH_ATTR_SKIN_WEIGHT:

353 return mesh->skin_weights.empty() ? 0 : (void*)&mesh->skin_weights[idx];

354 case GOAT3D_MESH_ATTR_SKIN_MATRIX:

355 return mesh->skin_matrices.empty() ? 0 : (void*)&mesh->skin_matrices[idx];

356 case GOAT3D_MESH_ATTR_COLOR:

357 return mesh->colors.empty() ? 0 : (void*)&mesh->colors[idx];

358 default:

359 break;

360 }

361 return 0;

362 }

363

364

365 void goat3d_set_mesh_faces(struct goat3d_mesh *mesh, const int *data, int num)

366 {

367 mesh->faces = VECDATA(Face, data, num);

368 }

369

370 int *goat3d_get_mesh_faces(struct goat3d_mesh *mesh)

371 {

372 return goat3d_get_mesh_face(mesh, 0);

373 }

374

375 int *goat3d_get_mesh_face(struct goat3d_mesh *mesh, int idx)

376 {

377 return mesh->faces.empty() ? 0 : mesh->faces[idx].v;

378 }

379

380 // immedate mode state

381 static enum goat3d_im_primitive im_prim;

382 static struct goat3d_mesh *im_mesh;

383 static Vector3 im_norm, im_tang;

384 static Vector2 im_texcoord;

385 static Vector4 im_skinw, im_color = Vector4(1, 1, 1, 1);

386 static Int4 im_skinmat;

387 static bool im_use[NUM_GOAT3D_MESH_ATTRIBS];

388

389

390 void goat3d_begin(struct goat3d_mesh *mesh, enum goat3d_im_primitive prim)

391 {

392 mesh->vertices.clear();

393 mesh->normals.clear();

394 mesh->tangents.clear();

395 mesh->texcoords.clear();

396 mesh->skin_weights.clear();

397 mesh->skin_matrices.clear();

398 mesh->colors.clear();

399 mesh->faces.clear();

400

401 im_mesh = mesh;

402 memset(im_use, 0, sizeof im_use);

403

404 im_prim = prim;

405 }

406

407 void goat3d_end(void)

408 {

409 switch(im_prim) {

410 case GOAT3D_TRIANGLES:

411 {

412 int num_faces = (int)im_mesh->vertices.size() / 3;

413 im_mesh->faces.resize(num_faces);

414

415 int vidx = 0;

416 for(int i=0; i<num_faces; i++) {

417 im_mesh->faces[i].v[0] = vidx++;

418 im_mesh->faces[i].v[1] = vidx++;

419 im_mesh->faces[i].v[2] = vidx++;

420 }

421 }

422 break;

423

424 case GOAT3D_QUADS:

425 {

426 int num_quads = (int)im_mesh->vertices.size() / 4;

427 im_mesh->faces.resize(num_quads * 2);

428

429 int vidx = 0;

430 for(int i=0; i<num_quads; i++) {

431 im_mesh->faces[i * 2].v[0] = vidx;

432 im_mesh->faces[i * 2].v[1] = vidx + 1;

433 im_mesh->faces[i * 2].v[2] = vidx + 2;

434

435 im_mesh->faces[i * 2 + 1].v[0] = vidx;

436 im_mesh->faces[i * 2 + 1].v[1] = vidx + 2;

437 im_mesh->faces[i * 2 + 1].v[2] = vidx + 3;

438

439 vidx += 4;

440 }

441 }

442 break;

443

444 default:

445 return;

446 };

447 }

448

449 void goat3d_vertex3f(float x, float y, float z)

450 {

451 im_mesh->vertices.push_back(Vector3(x, y, z));

452 if(im_use[GOAT3D_MESH_ATTR_NORMAL]) {

453 im_mesh->normals.push_back(im_norm);

454 }

455 if(im_use[GOAT3D_MESH_ATTR_TANGENT]) {

456 im_mesh->tangents.push_back(im_tang);

457 }

458 if(im_use[GOAT3D_MESH_ATTR_TEXCOORD]) {

459 im_mesh->texcoords.push_back(im_texcoord);

460 }

461 if(im_use[GOAT3D_MESH_ATTR_SKIN_WEIGHT]) {

462 im_mesh->skin_weights.push_back(im_skinw);

463 }

464 if(im_use[GOAT3D_MESH_ATTR_SKIN_MATRIX]) {

465 im_mesh->skin_matrices.push_back(im_skinmat);

466 }

467 if(im_use[GOAT3D_MESH_ATTR_COLOR]) {

468 im_mesh->colors.push_back(im_color);

469 }

470 }

471

472 void goat3d_normal3f(float x, float y, float z)

473 {

474 im_norm = Vector3(x, y, z);

475 im_use[GOAT3D_MESH_ATTR_NORMAL] = true;

476 }

477

478 void goat3d_tangent3f(float x, float y, float z)

479 {

480 im_tang = Vector3(x, y, z);

481 im_use[GOAT3D_MESH_ATTR_TANGENT] = true;

482 }

483

484 void goat3d_texcoord2f(float x, float y)

485 {

486 im_texcoord = Vector2(x, y);

487 im_use[GOAT3D_MESH_ATTR_TEXCOORD] = true;

488 }

489

490 void goat3d_skin_weight4f(float x, float y, float z, float w)

491 {

492 im_skinw = Vector4(x, y, z, w);

493 im_use[GOAT3D_MESH_ATTR_SKIN_WEIGHT] = true;

494 }

495

496 void goat3d_skin_matrix4i(int x, int y, int z, int w)

497 {

498 im_skinmat.x = x;

499 im_skinmat.y = y;

500 im_skinmat.z = z;

501 im_skinmat.w = w;

502 im_use[GOAT3D_MESH_ATTR_SKIN_MATRIX] = true;

503 }

504

505 void goat3d_color3f(float x, float y, float z)

506 {

507 goat3d_color4f(x, y, z, 1.0f);

508 }

509

510 void goat3d_color4f(float x, float y, float z, float w)

511 {

512 im_color = Vector4(x, y, z, w);

513 im_use[GOAT3D_MESH_ATTR_COLOR] = true;

514 }

515

516 /* lights */

517 void goat3d_add_light(struct goat3d *g, struct goat3d_light *lt)

518 {

519 g->scn->add_light(lt);

520 }

521

522 int goat3d_get_light_count(struct goat3d *g)

523 {

524 return g->scn->get_light_count();

525 }

526

527 struct goat3d_light *goat3d_get_light(struct goat3d *g, int idx)

528 {

529 return (goat3d_light*)g->scn->get_light(idx);

530 }

531

532 struct goat3d_light *goat3d_get_light_by_name(struct goat3d *g, const char *name)

533 {

534 return (goat3d_light*)g->scn->get_light(name);

535 }

536

537

538 struct goat3d_light *goat3d_create_light(void)

539 {

540 return new goat3d_light;

541 }

542

543 void goat3d_destroy_light(struct goat3d_light *lt)

544 {

545 delete lt;

546 }

547

548

549 /* cameras */

550 void goat3d_add_camera(struct goat3d *g, struct goat3d_camera *cam)

551 {

552 g->scn->add_camera(cam);

553 }

554

555 int goat3d_get_camera_count(struct goat3d *g)

556 {

557 return g->scn->get_camera_count();

558 }

559

560 struct goat3d_camera *goat3d_get_camera(struct goat3d *g, int idx)

561 {

562 return (goat3d_camera*)g->scn->get_camera(idx);

563 }

564

565 struct goat3d_camera *goat3d_get_camera_by_name(struct goat3d *g, const char *name)

566 {

567 return (goat3d_camera*)g->scn->get_camera(name);

568 }

569

570 struct goat3d_camera *goat3d_create_camera(void)

571 {

572 return new goat3d_camera;

573 }

574

575 void goat3d_destroy_camera(struct goat3d_camera *cam)

576 {

577 delete cam;

578 }

579

580

581

582 // node

583 void goat3d_add_node(struct goat3d *g, struct goat3d_node *node)

584 {

585 g->scn->add_node(node);

586 }

587

588 int goat3d_get_node_count(struct goat3d *g)

589 {

590 return g->scn->get_node_count();

591 }

592

593 struct goat3d_node *goat3d_get_node(struct goat3d *g, int idx)

594 {

595 return (goat3d_node*)g->scn->get_node(idx);

596 }

597

598 struct goat3d_node *goat3d_get_node_by_name(struct goat3d *g, const char *name)

599 {

600 return (goat3d_node*)g->scn->get_node(name);

601 }

602

603 struct goat3d_node *goat3d_create_node(void)

604 {

605 return new goat3d_node;

606 }

607

608 void goat3d_set_node_name(struct goat3d_node *node, const char *name)

609 {

610 node->set_name(name);

611 }

612

613 const char *goat3d_get_node_name(const struct goat3d_node *node)

614 {

615 return node->get_name();

616 }

617

618 void goat3d_set_node_object(struct goat3d_node *node, enum goat3d_node_type type, void *obj)

619 {

620 node->set_object((Object*)obj);

621 }

622

623 void *goat3d_get_node_object(const struct goat3d_node *node)

624 {

625 return (void*)node->get_object();

626 }

627

628 enum goat3d_node_type goat3d_get_node_type(const struct goat3d_node *node)

629 {

630 const Object *obj = node->get_object();

631 if(dynamic_cast<const Mesh*>(obj)) {

632 return GOAT3D_NODE_MESH;

633 }

634 if(dynamic_cast<const Light*>(obj)) {

635 return GOAT3D_NODE_LIGHT;

636 }

637 if(dynamic_cast<const Camera*>(obj)) {

638 return GOAT3D_NODE_CAMERA;

639 }

640

641 return GOAT3D_NODE_NULL;

642 }

643

644 void goat3d_add_node_child(struct goat3d_node *node, struct goat3d_node *child)

645 {

646 node->add_child(node);

647 }

648

649 int goat3d_get_node_child_count(const struct goat3d_node *node)

650 {

651 return node->get_children_count();

652 }

653

654 struct goat3d_node *goat3d_get_node_child(const struct goat3d_node *node, int idx)

655 {

656 return (goat3d_node*)node->get_child(idx);

657 }

658

659 void goat3d_set_node_position(struct goat3d_node *node, float x, float y, float z, long tmsec)

660 {

661 node->set_position(Vector3(x, y, z), tmsec);

662 }

663

664 void goat3d_set_node_rotation(struct goat3d_node *node, float qx, float qy, float qz, float qw, long tmsec)

665 {

666 node->set_rotation(Quaternion(qw, qx, qy, qz), tmsec);

667 }

668

669 void goat3d_set_node_scaling(struct goat3d_node *node, float sx, float sy, float sz, long tmsec)

670 {

671 node->set_scaling(Vector3(sx, sy, sz), tmsec);

672 }

673

674 void goat3d_set_node_pivot(struct goat3d_node *node, float px, float py, float pz)

675 {

676 node->set_pivot(Vector3(px, py, pz));

677 }

678

679

680 void goat3d_get_node_position(const struct goat3d_node *node, float *xptr, float *yptr, float *zptr, long tmsec)

681 {

682 Vector3 pos = node->get_position(tmsec);

683 *xptr = pos.x;

684 *yptr = pos.y;

685 *zptr = pos.z;

686 }

687

688 void goat3d_get_node_rotation(const struct goat3d_node *node, float *xptr, float *yptr, float *zptr, float *wptr, long tmsec)

689 {

690 Quaternion q = node->get_rotation(tmsec);

691 *xptr = q.v.x;

692 *yptr = q.v.y;

693 *zptr = q.v.z;

694 *wptr = q.s;

695 }

696

697 void goat3d_get_node_scaling(const struct goat3d_node *node, float *xptr, float *yptr, float *zptr, long tmsec)

698 {

699 Vector3 scale = node->get_scaling(tmsec);

700 *xptr = scale.x;

701 *yptr = scale.y;

702 *zptr = scale.z;

703 }

704

705 void goat3d_get_node_pivot(const struct goat3d_node *node, float *xptr, float *yptr, float *zptr)

706 {

707 Vector3 pivot = node->get_pivot();

708 *xptr = pivot.x;

709 *yptr = pivot.y;

710 *zptr = pivot.z;

711 }

712

713

714 void goat3d_get_node_matrix(const struct goat3d_node *node, float *matrix, long tmsec)

715 {

716 node->get_xform(tmsec, (Matrix4x4*)matrix);

717 }

718

719

720 } // extern "C"

721

722

723 static long read_file(void *buf, size_t bytes, void *uptr)

724 {

725 return (long)fread(buf, 1, bytes, (FILE*)uptr);

726 }

727

728 static long write_file(const void *buf, size_t bytes, void *uptr)

729 {

730 return (long)fwrite(buf, 1, bytes, (FILE*)uptr);

731 }

732

733 static long seek_file(long offs, int whence, void *uptr)

734 {

735 if(fseek((FILE*)uptr, offs, whence) == -1) {

736 return -1;

737 }

738 return ftell((FILE*)uptr);

739 }

740

741 static std::string clean_filename(const char *str)

742 {

743 const char *last_slash = strrchr(str, '/');

744 if(!last_slash) {

745 last_slash = strrchr(str, '\\');

746 }

747

748 if(last_slash) {

749 str = last_slash + 1;

750 }

751

752 char *buf = (char*)alloca(strlen(str) + 1);

753 char *dest = buf;

754 while(*str) {

755 char c = *str++;

756 *dest++ = tolower(c);

757 }

758 return buf;

759 }