goat3d: 0ea2b355bc96 goatview/src/goatview.cc

goat3d

view goatview/src/goatview.cc @ 102:0ea2b355bc96

foo

author	John Tsiombikas <nuclear@member.fsf.org>
date	Sat, 12 Sep 2015 17:32:12 +0300
parents	a7c7fbeef93b
children	45a9d493e98c

line source

1 #include <stdio.h>

2 #include <limits.h>

3 #include <map>

4 #include "opengl.h"

5 #include <QtOpenGL/QtOpenGL>

6 #include <vmath/vmath.h>

7 #include "goatview.h"

8 #include "goat3d.h"

10 static void draw_grid();

11 static void draw_grid(float sz, int nlines, float alpha = 1.0f);

12 static void draw_node(goat3d_node *node);

13 static void draw_mesh(goat3d_mesh *mesh);

14 static int next_pow2(int x);

16 goat3d *scene;

17 static SceneModel *sdata;

18 static GoatViewport *glview;

20 static long anim_time;

21 static float cam_theta, cam_phi = 25, cam_dist = 8;

22 static float fov = 60.0;

23 static bool use_nodes = true;

24 static bool use_lighting = true;

25 static bool use_textures = true;

27 void post_redisplay()

28 {

29 if(glview) {

30 glview->updateGL();

31 }

32 }

35 GoatView::GoatView()

36 {

37 glview = 0;

38 scene_model = 0;

40 QGLFormat glfmt = QGLFormat::defaultFormat();

41 glfmt.setSampleBuffers(true);

42 QGLFormat::setDefaultFormat(glfmt);

44 QSettings settings;

45 resize(settings.value("main/size", QSize(1024, 768)).toSize());

46 move(settings.value("main/pos", QPoint(100, 100)).toPoint());

47 use_nodes = settings.value("use_nodes", true).toBool();

48 use_lighting = settings.value("use_lighting", true).toBool();

49 use_textures = settings.value("use_textures", true).toBool();

51 make_center(); // must be first

52 make_menu();

53 make_dock();

55 statusBar();

57 setWindowTitle("GoatView");

58 }

60 GoatView::~GoatView()

61 {

62 delete scene_model;

63 sdata = 0;

64 }

66 void GoatView::closeEvent(QCloseEvent *ev)

67 {

68 QSettings settings;

69 settings.setValue("main/size", size());

70 settings.setValue("main/pos", pos());

71 settings.setValue("use_nodes", use_nodes);

72 settings.setValue("use_lighting", use_lighting);

73 }

76 bool GoatView::load_scene(const char *fname)

77 {

78 if(scene) {

79 close_scene();

80 }

81 if(!(scene = goat3d_create()) || goat3d_load(scene, fname) == -1) {

82 QMessageBox::critical(this, "Error", "Failed to load scene file: " + QString(fname));

83 return false;

84 }

86 float bmin[3], bmax[3];

87 if(goat3d_get_bounds(scene, bmin, bmax) != -1) {

88 float bsize = (Vector3(bmax[0], bmax[1], bmax[2]) - Vector3(bmin[0], bmin[1], bmin[2])).length();

89 cam_dist = bsize / tan(DEG_TO_RAD(fov) / 2.0);

90 printf("bounds size: %f, cam_dist: %f\n", bsize, cam_dist);

91 }

93 scene_model->set_scene(scene);

94 treeview->expandAll();

95 treeview->resizeColumnToContents(0);

97 sdata = scene_model; // set the global sdata ptr

98 post_redisplay();

99 return true;

100 }

101

102 bool GoatView::load_anim(const char *fname)

103 {

104 if(!scene) {

105 QMessageBox::critical(this, "Error", "You must load a scene before loading any animations!");

106 return false;

107 }

108

109 if(goat3d_load_anim(scene, fname) == -1) {

110 QMessageBox::critical(this, "Error", QString("Failed to load animation: ") + QString(fname));

111 return false;

112 }

113

114

115 long tstart = LONG_MAX, tend = LONG_MIN;

116 int num_nodes = goat3d_get_node_count(scene);

117 for(int i=0; i<num_nodes; i++) {

118 goat3d_node *node = goat3d_get_node(scene, i);

119 if(goat3d_get_node_parent(node)) {

120 continue;

121 }

122

123 long t0, t1;

124 if(goat3d_get_anim_timeline(node, &t0, &t1) != -1) {

125 if(t0 < tstart) tstart = t0;

126 if(t1 > tend) tend = t1;

127 }

128 }

129

130 if(tstart != LONG_MAX) {

131 grp_anim_ctl->setDisabled(false);

132 grp_anim_time->setDisabled(false);

133

134 slider_time->setMinimum(tstart);

135 slider_time->setMaximum(tend);

136

137 spin_time->setMinimum(tstart);

138 spin_time->setMaximum(tend);

139

140 label_time_start->setText(QString::number(tstart));

141 label_time_end->setText(QString::number(tend));

142 }

143

144 post_redisplay();

145 return true;

146 }

147

148 bool GoatView::make_menu()

149 {

150 // file menu

151 QMenu *menu_file = menuBar()->addMenu("&File");

152

153 QAction *act_open_sce = new QAction("&Open Scene", this);

154 act_open_sce->setShortcuts(QKeySequence::Open);

155 connect(act_open_sce, &QAction::triggered, this, &GoatView::open_scene);

156 menu_file->addAction(act_open_sce);

157

158 QAction *act_open_anm = new QAction("Open &Animation", this);

159 connect(act_open_anm, &QAction::triggered, this, &GoatView::open_anim);

160 menu_file->addAction(act_open_anm);

161

162 QAction *act_close = new QAction("&Close", this);

163 connect(act_close, &QAction::triggered, this, &GoatView::close_scene);

164 menu_file->addAction(act_close);

165

166 menu_file->addSeparator();

167

168 QAction *act_quit = new QAction("&Quit", this);

169 act_quit->setShortcuts(QKeySequence::Quit);

170 connect(act_quit, &QAction::triggered, [&](){ qApp->quit(); });

171 menu_file->addAction(act_quit);

172

173 // view menu

174 QMenu *menu_view = menuBar()->addMenu("&View");

175

176 QAction *act_use_nodes = new QAction("use nodes", this);

177 act_use_nodes->setCheckable(true);

178 act_use_nodes->setChecked(use_nodes);

179 connect(act_use_nodes, &QAction::triggered, this,

180 [&](){ use_nodes = !use_nodes; post_redisplay(); });

181 menu_view->addAction(act_use_nodes);

182

183 QAction *act_use_lighting = new QAction("lighting", this);

184 act_use_lighting->setCheckable(true);

185 act_use_lighting->setChecked(use_lighting);

186 connect(act_use_lighting, &QAction::triggered, glview, &GoatViewport::toggle_lighting);

187 menu_view->addAction(act_use_lighting);

188

189 // help menu

190 QMenu *menu_help = menuBar()->addMenu("&Help");

191

192 QAction *act_about = new QAction("&About", this);

193 connect(act_about, &QAction::triggered, this, &GoatView::show_about);

194 menu_help->addAction(act_about);

195 return true;

196 }

197

198 bool GoatView::make_dock()

199 {

200 // ---- side-dock ----

201 QWidget *dock_cont = new QWidget;

202 QVBoxLayout *dock_vbox = new QVBoxLayout;

203 dock_cont->setLayout(dock_vbox);

204

205 QDockWidget *dock = new QDockWidget(this);

206 dock->setAllowedAreas(Qt::LeftDockWidgetArea | Qt::RightDockWidgetArea);

207 dock->setWidget(dock_cont);

208 addDockWidget(Qt::LeftDockWidgetArea, dock);

209

210 // make the tree view widget

211 treeview = new QTreeView;

212 treeview->setAlternatingRowColors(true);

213 treeview->setSelectionMode(QAbstractItemView::SingleSelection);

214 dock_vbox->addWidget(treeview);

215

216 scene_model = new SceneModel;

217 connect(scene_model, &SceneModel::dataChanged, [&](){ post_redisplay(); });

218 treeview->setModel(scene_model);

219

220 connect(treeview->selectionModel(), &QItemSelectionModel::selectionChanged,

221 [&](){ scene_model->selchange(treeview->selectionModel()->selectedIndexes()); });

222

223 // misc

224 QPushButton *bn_quit = new QPushButton("quit");

225 dock_vbox->addWidget(bn_quit);

226 connect(bn_quit, &QPushButton::clicked, [&](){ qApp->quit(); });

227

228 // ---- bottom dock ----

229 dock_cont = new QWidget;

230 QHBoxLayout *dock_hbox = new QHBoxLayout;

231 dock_cont->setLayout(dock_hbox);

232

233 // animation control box

234 grp_anim_ctl = new QGroupBox("Animation controls");

235 grp_anim_ctl->setSizePolicy(QSizePolicy(QSizePolicy::Maximum, QSizePolicy::Preferred));

236 grp_anim_ctl->setDisabled(true);

237 dock_hbox->addWidget(grp_anim_ctl);

238

239 QVBoxLayout *anim_ctl_box = new QVBoxLayout;

240 grp_anim_ctl->setLayout(anim_ctl_box);

241

242 chk_loop = new QCheckBox("loop");

243 chk_loop->setChecked(false);

244 anim_ctl_box->addWidget(chk_loop);

245

246 QToolBar *toolbar_ctl = new QToolBar;

247 anim_ctl_box->addWidget(toolbar_ctl);

248

249 act_rewind = new QAction(style()->standardIcon(QStyle::SP_MediaSkipBackward), "Rewind", this);

250 connect(act_rewind, &QAction::triggered, [this](){ slider_time->setValue(slider_time->minimum()); });

251 toolbar_ctl->addAction(act_rewind);

252

253 act_play = new QAction(style()->standardIcon(QStyle::SP_MediaPlay), "Play", this);

254 toolbar_ctl->addAction(act_play);

255

256 /* timeline controls

257 * /------------------------------\ grp_anim_time with vbox_timeline layout

258 * | /-------+---------+--------\ |

260 * | \-------+---------+--------/ |

261 * +------------------------------+

262 * | /-------+---------+--------\ |

264 * | \-------+---------+--------/ |

265 * \------------------------------/

266 */

267 grp_anim_time = new QGroupBox("Timeline");

268 grp_anim_time->setDisabled(true);

269 dock_hbox->addWidget(grp_anim_time);

270

271 QVBoxLayout *vbox_timeline = new QVBoxLayout;

272 grp_anim_time->setLayout(vbox_timeline);

273 QHBoxLayout *hbox_timespin = new QHBoxLayout;

274 vbox_timeline->addLayout(hbox_timespin);

275 QHBoxLayout *hbox_timeslider = new QHBoxLayout;

276 vbox_timeline->addLayout(hbox_timeslider);

277

278 hbox_timespin->addWidget(new QLabel("msec"));

279 spin_time = new QSpinBox;

280 hbox_timespin->addWidget(spin_time);

281 hbox_timespin->addStretch();

282

283 label_time_start = new QLabel;

284 hbox_timeslider->addWidget(label_time_start);

285

286 slider_time = new QSlider(Qt::Orientation::Horizontal);

287 hbox_timeslider->addWidget(slider_time);

288

289 label_time_end = new QLabel;

290 hbox_timeslider->addWidget(label_time_end);

291

292 connect(slider_time, &QSlider::valueChanged,

293 [&](){ anim_time = slider_time->value(); spin_time->setValue(anim_time); post_redisplay(); });

294

295 typedef void (QSpinBox::*ValueChangedIntFunc)(int);

296 connect(spin_time, (ValueChangedIntFunc)&QSpinBox::valueChanged,

297 [&](){ anim_time = spin_time->value(); slider_time->setValue(anim_time); post_redisplay(); });

298

299 dock = new QDockWidget(this);

300 dock->setAllowedAreas(Qt::BottomDockWidgetArea);

301 dock->setWidget(dock_cont);

302 addDockWidget(Qt::BottomDockWidgetArea, dock);

303

304 return true;

305 }

306

307 bool GoatView::make_center()

308 {

309 glview = ::glview = new GoatViewport(this);

310 setCentralWidget(glview);

311 return true;

312 }

313

314 void GoatView::open_scene()

315 {

316 std::string fname = QFileDialog::getOpenFileName(this, "Open scene file", "",

317 "Goat3D Scene (*.goatsce);;All Files (*)").toStdString();

318 if(fname.empty()) {

319 statusBar()->showMessage("Abort: No file selected!");

320 return;

321 }

322

323 statusBar()->showMessage("opening scene file");

324 if(!load_scene(fname.c_str())) {

325 statusBar()->showMessage("failed to load scene file");

326 return;

327 }

328 statusBar()->showMessage("Successfully loaded scene: " + QString(fname.c_str()));

329 }

330

331 void GoatView::close_scene()

332 {

333 scene_model->clear_scene();

334 treeview->reset();

335 goat3d_free(scene);

336 scene = 0;

337

338 grp_anim_ctl->setDisabled(true);

339 grp_anim_time->setDisabled(true);

340 }

341

342 void GoatView::open_anim()

343 {

344 std::string fname = QFileDialog::getOpenFileName(this, "Open animation file", "",

345 "Goat3D Animation (*.goatanm);;All Files (*)").toStdString();

346 if(fname.empty()) {

347 statusBar()->showMessage("Abort: No file selected!");

348 return;

349 }

350

351 statusBar()->showMessage("opening animation file");

352 if(!load_anim(fname.c_str())) {

353 statusBar()->showMessage("failed to load animation file");

354 return;

355 }

356 statusBar()->showMessage("Successfully loaded animation: " + QString(fname.c_str()));

357 }

358

359

360 // ---- OpenGL viewport ----

361 GoatViewport::GoatViewport(QWidget *main_win)

362 : QGLWidget(QGLFormat(QGL::DepthBuffer | QGL::SampleBuffers))

363 {

364 this->main_win = main_win;

365 initialized = false;

366 }

367

368 GoatViewport::~GoatViewport()

369 {

370 }

371

372 QSize GoatViewport::sizeHint() const

373 {

374 return QSize(800, 600);

375 }

376

377 #define CRITICAL(error, detail) \

378 do { \

379 fprintf(stderr, "%s: %s\n", error, detail); \

380 QMessageBox::critical(main_win, error, detail); \

381 abort(); \

382 } while(0)

383

384 void GoatViewport::initializeGL()

385 {

386 if(initialized) return;

387 initialized = true;

388

389 init_opengl();

390

391 if(!GLEW_ARB_transpose_matrix) {

392 CRITICAL("OpenGL initialization failed", "ARB_transpose_matrix extension not found!");

393 }

394

395 glClearColor(0.1f, 0.1f, 0.1f, 1.0f);

396

397 glEnable(GL_DEPTH_TEST);

398 glEnable(GL_CULL_FACE);

399 if(use_lighting) {

400 glEnable(GL_LIGHTING);

401 }

402 glEnable(GL_LIGHT0);

403

404 float ldir[] = {-1, 1, 2, 0};

405 glLightfv(GL_LIGHT0, GL_POSITION, ldir);

406

407 glEnable(GL_MULTISAMPLE);

408 }

409

410 void GoatViewport::resizeGL(int xsz, int ysz)

411 {

412 glViewport(0, 0, xsz, ysz);

413 glMatrixMode(GL_PROJECTION);

414 glLoadIdentity();

415 gluPerspective(60.0, (float)xsz / (float)ysz, 0.5, 5000.0);

416 }

417

418 void GoatViewport::paintGL()

419 {

420 glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);

421

422 glMatrixMode(GL_MODELVIEW);

423 glLoadIdentity();

424 glTranslatef(0, 0, -cam_dist);

425 glRotatef(cam_phi, 1, 0, 0);

426 glRotatef(cam_theta, 0, 1, 0);

427

428 if(scene) {

429 if(use_nodes) {

430 int node_count = goat3d_get_node_count(scene);

431 for(int i=0; i<node_count; i++) {

432 goat3d_node *node = goat3d_get_node(scene, i);

433 if(!goat3d_get_node_parent(node)) {

434 draw_node(node); // only draw root nodes, the rest will be drawn recursively

435 }

436 }

437 } else {

438 int mesh_count = goat3d_get_mesh_count(scene);

439 for(int i=0; i<mesh_count; i++) {

440 goat3d_mesh *mesh = goat3d_get_mesh(scene, i);

441 draw_mesh(mesh);

442 }

443 }

444 }

445

446 draw_grid();

447 }

448

449 void GoatViewport::toggle_lighting()

450 {

451 use_lighting = !use_lighting;

452 if(use_lighting) {

453 glEnable(GL_LIGHTING);

454 } else {

455 glDisable(GL_LIGHTING);

456 }

457 post_redisplay();

458 }

459

460 #ifndef GLEW_ARB_transpose_matrix

461 #error "GLEW_ARB_transpose_matrix undefined?"

462 #endif

463

464 static void draw_grid()

465 {

466 float viewsz_orig = cam_dist * tan(DEG_TO_RAD(fov) / 2.0);

467 float sz1 = next_pow2((int)viewsz_orig);

468 float sz0 = sz1 / 2.0;

469 float t = (viewsz_orig - sz0) / (sz1 - sz0);

470 float alpha = t < 0.333333 ? 0.0 : (t > 0.666666 ? 1.0 : (t - 0.333333) / 0.333333);

471

472 glPushAttrib(GL_ENABLE_BIT | GL_DEPTH_BITS);

473

474 glEnable(GL_BLEND);

475 glDepthMask(0);

476

477 glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);

478 draw_grid(sz0 * 2.0, 10, 1.0 - alpha);

479 draw_grid(sz1 * 2.0, 10, alpha);

480

481 glDepthMask(1);

482 glPopAttrib();

483 }

484

485 static void draw_grid(float sz, int nlines, float alpha)

486 {

487 float hsz = sz / 2.0;

488 float offs = sz / (float)nlines;

489

490 glPushAttrib(GL_ENABLE_BIT);

491 glDisable(GL_LIGHTING);

492 glDisable(GL_TEXTURE_2D);

493

494 glLineWidth(2.0);

495 glBegin(GL_LINES);

496 glColor4f(1, 0, 0, alpha);

497 glVertex3f(-hsz, 0, 0);

498 glVertex3f(hsz, 0, 0);

499 glColor4f(0, 0, 1, alpha);

500 glVertex3f(0, 0, -hsz);

501 glVertex3f(0, 0, hsz);

502 glEnd();

503

504 glLineWidth(1.0);

505 glBegin(GL_LINES);

506 glColor4f(0.5, 0.5, 0.5, alpha);

507 for(int i=0; i<nlines / 2; i++) {

508 float dist = (float)(i + 1) * offs;

509 for(int j=0; j<2; j++) {

510 float sign = j > 0 ? -1.0 : 1.0;

511 glVertex3f(-hsz, 0, dist * sign);

512 glVertex3f(hsz, 0, dist * sign);

513 glVertex3f(dist * sign, 0, -hsz);

514 glVertex3f(dist * sign, 0, hsz);

515 }

516 }

517 glEnd();

518

519 glPopAttrib();

520 }

521

522 static void draw_node(goat3d_node *node)

523 {

524 SceneNodeData *data = sdata ? sdata->get_node_data(node) : 0;

525 if(!data) return;

526

527 float xform[16];

528 goat3d_get_node_matrix(node, xform, anim_time);

529

530 glPushMatrix();

531 glMultTransposeMatrixf(xform);

532

533 if(data->visible) {

534 if(goat3d_get_node_type(node) == GOAT3D_NODE_MESH) {

535 goat3d_mesh *mesh = (goat3d_mesh*)goat3d_get_node_object(node);

536

537 draw_mesh(mesh);

538

539 if(data->selected) {

540 float bmin[3], bmax[3];

541 goat3d_get_mesh_bounds(mesh, bmin, bmax);

542

543 glPushAttrib(GL_ENABLE_BIT);

544 glDisable(GL_LIGHTING);

545

546 glColor3f(0.3, 1, 0.2);

547

548 glBegin(GL_LINE_LOOP);

549 glVertex3f(bmin[0], bmin[1], bmin[2]);

550 glVertex3f(bmax[0], bmin[1], bmin[2]);

551 glVertex3f(bmax[0], bmin[1], bmax[2]);

552 glVertex3f(bmin[0], bmin[1], bmax[2]);

553 glEnd();

554 glBegin(GL_LINE_LOOP);

555 glVertex3f(bmin[0], bmax[1], bmin[2]);

556 glVertex3f(bmax[0], bmax[1], bmin[2]);

557 glVertex3f(bmax[0], bmax[1], bmax[2]);

558 glVertex3f(bmin[0], bmax[1], bmax[2]);

559 glEnd();

560 glBegin(GL_LINES);

561 glVertex3f(bmin[0], bmin[1], bmin[2]);

562 glVertex3f(bmin[0], bmax[1], bmin[2]);

563 glVertex3f(bmin[0], bmin[1], bmax[2]);

564 glVertex3f(bmin[0], bmax[1], bmax[2]);

565 glVertex3f(bmax[0], bmin[1], bmin[2]);

566 glVertex3f(bmax[0], bmax[1], bmin[2]);

567 glVertex3f(bmax[0], bmin[1], bmax[2]);

568 glVertex3f(bmax[0], bmax[1], bmax[2]);

569 glEnd();

570

571 glPopAttrib();

572 }

573 }

574 }

575

576 int num_child = goat3d_get_node_child_count(node);

577 for(int i=0; i<num_child; i++) {

578 draw_node(goat3d_get_node_child(node, i));

579 }

580

581 glPopMatrix();

582 }

583

584 static void draw_mesh(goat3d_mesh *mesh)

585 {

586 static const float white[] = {1, 1, 1, 1};

587 static const float black[] = {0, 0, 0, 1};

588

589 const float *color;

590 goat3d_material *mtl = goat3d_get_mesh_mtl(mesh);

591

592 if(mtl && (color = goat3d_get_mtl_attrib(mtl, GOAT3D_MAT_ATTR_DIFFUSE))) {

593 glMaterialfv(GL_FRONT_AND_BACK, GL_AMBIENT_AND_DIFFUSE, color);

594 glColor3fv(color);

595 } else {

596 glMaterialfv(GL_FRONT_AND_BACK, GL_AMBIENT_AND_DIFFUSE, white);

597 glColor3fv(white);

598 }

599 if(mtl && (color = goat3d_get_mtl_attrib(mtl, GOAT3D_MAT_ATTR_SPECULAR))) {

600 glMaterialfv(GL_FRONT_AND_BACK, GL_SPECULAR, color);

601 } else {

602 glMaterialfv(GL_FRONT_AND_BACK, GL_SPECULAR, black);

603 }

604 if(mtl && (color = goat3d_get_mtl_attrib(mtl, GOAT3D_MAT_ATTR_SHININESS))) {

605 glMaterialf(GL_FRONT_AND_BACK, GL_SHININESS, color[0]);

606 } else {

607 glMaterialf(GL_FRONT_AND_BACK, GL_SHININESS, 60.0);

608 }

609 // TODO texture

610

611

612 int num_faces = goat3d_get_mesh_face_count(mesh);

613 int num_verts = goat3d_get_mesh_attrib_count(mesh, GOAT3D_MESH_ATTR_VERTEX);

614

615 glEnableClientState(GL_VERTEX_ARRAY);

616 glVertexPointer(3, GL_FLOAT, 0, goat3d_get_mesh_attribs(mesh, GOAT3D_MESH_ATTR_VERTEX));

617

618 float *data;

619 if((data = (float*)goat3d_get_mesh_attribs(mesh, GOAT3D_MESH_ATTR_NORMAL))) {

620 glEnableClientState(GL_NORMAL_ARRAY);

621 glNormalPointer(GL_FLOAT, 0, data);

622 }

623 if((data = (float*)goat3d_get_mesh_attribs(mesh, GOAT3D_MESH_ATTR_TEXCOORD))) {

624 glEnableClientState(GL_TEXTURE_COORD_ARRAY);

625 glTexCoordPointer(2, GL_FLOAT, 0, data);

626 }

627

628 int *indices;

629 if((indices = goat3d_get_mesh_faces(mesh))) {

630 glDrawElements(GL_TRIANGLES, num_faces * 3, GL_UNSIGNED_INT, indices);

631 } else {

632 glDrawArrays(GL_TRIANGLES, 0, num_verts * 3);

633 }

634

635 glDisableClientState(GL_VERTEX_ARRAY);

636 glDisableClientState(GL_NORMAL_ARRAY);

637 glDisableClientState(GL_TEXTURE_COORD_ARRAY);

638 }

639

640

641 static float prev_x, prev_y;

642 void GoatViewport::mousePressEvent(QMouseEvent *ev)

643 {

644 prev_x = ev->x();

645 prev_y = ev->y();

646 }

647

648 void GoatViewport::mouseMoveEvent(QMouseEvent *ev)

649 {

650 int dx = ev->x() - prev_x;

651 int dy = ev->y() - prev_y;

652 prev_x = ev->x();

653 prev_y = ev->y();

654

655 if(!dx && !dy) return;

656

657 if(ev->buttons() & Qt::LeftButton) {

658 cam_theta += dx * 0.5;

659 cam_phi += dy * 0.5;

660

661 if(cam_phi < -90) cam_phi = -90;

662 if(cam_phi > 90) cam_phi = 90;

663 }

664 if(ev->buttons() & Qt::RightButton) {

665 cam_dist += dy * 0.1;

666

667 if(cam_dist < 0.0) cam_dist = 0.0;

668 }

669 post_redisplay();

670 }

671

672 static const char *about_str =

673 "GoatView - Goat3D scene file viewer "

675 " "

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

677 "it under the terms of the GNU General Public License as published by "

678 "the Free Software Foundation, either version 3 of the License, or "

679 "(at your option) any later version. "

680 " "

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

682 "but WITHOUT ANY WARRANTY; without even the implied warranty of "

683 "MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the "

684 "GNU General Public License for more details. "

685 " "

686 "You should have received a copy of the GNU General Public License "

687 "along with this program. If not, see <a href=\"http://www.gnu.org/licenses/gpl\">http://www.gnu.org/licenses/gpl</a>.";

688

689 void GoatView::show_about()

690 {

691 QMessageBox::information(this, "About GoatView", about_str);

692 }

693

694

695 static int next_pow2(int x)

696 {

697 x--;

698 x = (x >> 1) | x;

699 x = (x >> 2) | x;

700 x = (x >> 4) | x;

701 x = (x >> 8) | x;

702 x = (x >> 16) | x;

703 return x + 1;

704 }