goat3d: b43d33f3ba69 goatview/src/goatview.cc

goat3d

view goatview/src/goatview.cc @ 98:b43d33f3ba69

[goatview] better LLVM/gcc detection [goatview] close_scene might have solved the occasional crashes on opening a second scene

author	John Tsiombikas <nuclear@member.fsf.org>
date	Wed, 21 May 2014 04:08:11 +0300
parents	da100bf13f7f
children	d7ab4f13f5af

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 act_play->setDisabled(false);

132 act_rewind->setDisabled(false);

133 chk_loop->setDisabled(false);

134

135 slider_time->setDisabled(false);

136 slider_time->setMinimum(tstart);

137 slider_time->setMaximum(tend);

138

139 spin_time->setDisabled(false);

140 spin_time->setMinimum(tstart);

141 spin_time->setMaximum(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 QGroupBox *grp_anim_ctl = new QGroupBox("Animation controls");

235 // TODO figure out how these fucking stretching policies work...

236 //grp_anim_ctl->sizePolicy().setHorizontalPolicy(QSizePolicy::Maximum);

237 grp_anim_ctl->sizePolicy().setHorizontalStretch(1);

238 dock_hbox->addWidget(grp_anim_ctl);

239

240 QVBoxLayout *anim_ctl_box = new QVBoxLayout;

241 grp_anim_ctl->setLayout(anim_ctl_box);

242

243 chk_loop = new QCheckBox("loop");

244 chk_loop->setDisabled(true);

245 chk_loop->setChecked(false);

246 anim_ctl_box->addWidget(chk_loop);

247

248 QToolBar *toolbar_ctl = new QToolBar;

249 anim_ctl_box->addWidget(toolbar_ctl);

250

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

252 act_rewind->setDisabled(true);

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

254 toolbar_ctl->addAction(act_rewind);

255

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

257 act_play->setDisabled(true);

258 toolbar_ctl->addAction(act_play);

259

260 // slider and spinbox

261 QWidget *ssgroup = new QWidget;

262 ssgroup->sizePolicy().setHorizontalStretch(4);

263 dock_hbox->addWidget(ssgroup);

264

265 QGridLayout *ssgrid = new QGridLayout;

266 //dock_hbox->addLayout(ssgrid);

267 ssgroup->setLayout(ssgrid);

268

269 ssgrid->addWidget(new QLabel("msec"), 0, 0);

270 spin_time = new QSpinBox;

271 spin_time->setDisabled(true);

272 ssgrid->addWidget(spin_time, 0, 1);

273

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

275 slider_time->setDisabled(true);

276 ssgrid->addWidget(slider_time, 1, 0, 1, 3);

277

278 connect(slider_time, &QSlider::valueChanged,

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

280

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

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

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

284

285 dock = new QDockWidget(this);

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

287 dock->setWidget(dock_cont);

288 addDockWidget(Qt::BottomDockWidgetArea, dock);

289

290 return true;

291 }

292

293 bool GoatView::make_center()

294 {

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

296 setCentralWidget(glview);

297 return true;

298 }

299

300 void GoatView::open_scene()

301 {

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

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

304 if(fname.empty()) {

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

306 return;

307 }

308

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

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

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

312 return;

313 }

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

315 }

316

317 void GoatView::close_scene()

318 {

319 scene_model->clear_scene();

320 treeview->reset();

321 goat3d_free(scene);

322 scene = 0;

323 }

324

325 void GoatView::open_anim()

326 {

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

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

329 if(fname.empty()) {

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

331 return;

332 }

333

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

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

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

337 return;

338 }

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

340 }

341

342

343 // ---- OpenGL viewport ----

344 GoatViewport::GoatViewport(QWidget *main_win)

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

346 {

347 this->main_win = main_win;

348 initialized = false;

349 }

350

351 GoatViewport::~GoatViewport()

352 {

353 }

354

355 QSize GoatViewport::sizeHint() const

356 {

357 return QSize(800, 600);

358 }

359

360 #define CRITICAL(error, detail) \

361 do { \

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

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

364 abort(); \

365 } while(0)

366

367 void GoatViewport::initializeGL()

368 {

369 if(initialized) return;

370 initialized = true;

371

372 init_opengl();

373

374 if(!GLEW_ARB_transpose_matrix) {

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

376 }

377

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

379

380 glEnable(GL_DEPTH_TEST);

381 glEnable(GL_CULL_FACE);

382 if(use_lighting) {

383 glEnable(GL_LIGHTING);

384 }

385 glEnable(GL_LIGHT0);

386

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

388 glLightfv(GL_LIGHT0, GL_POSITION, ldir);

389

390 glEnable(GL_MULTISAMPLE);

391 }

392

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

394 {

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

396 glMatrixMode(GL_PROJECTION);

397 glLoadIdentity();

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

399 }

400

401 void GoatViewport::paintGL()

402 {

403 glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);

404

405 glMatrixMode(GL_MODELVIEW);

406 glLoadIdentity();

407 glTranslatef(0, 0, -cam_dist);

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

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

410

411 draw_grid();

412

413 if(!scene) return;

414

415 if(use_nodes) {

416 int node_count = goat3d_get_node_count(scene);

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

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

419 if(!goat3d_get_node_parent(node)) {

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

421 }

422 }

423 } else {

424 int mesh_count = goat3d_get_mesh_count(scene);

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

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

427 draw_mesh(mesh);

428 }

429 }

430 }

431

432 void GoatViewport::toggle_lighting()

433 {

434 use_lighting = !use_lighting;

435 if(use_lighting) {

436 glEnable(GL_LIGHTING);

437 } else {

438 glDisable(GL_LIGHTING);

439 }

440 updateGL();

441 }

442

443 #ifndef GLEW_ARB_transpose_matrix

444 #error "GLEW_ARB_transpose_matrix undefined?"

445 #endif

446

447 static void draw_grid()

448 {

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

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

451 float sz0 = sz1 / 2.0;

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

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

454

455 glPushAttrib(GL_ENABLE_BIT | GL_DEPTH_BITS);

456

457 glEnable(GL_BLEND);

458 glDepthFunc(GL_ALWAYS);

459

460 glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);

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

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

463

464 glPopAttrib();

465 }

466

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

468 {

469 float hsz = sz / 2.0;

470 float offs = sz / (float)nlines;

471

472 glPushAttrib(GL_ENABLE_BIT);

473 glDisable(GL_LIGHTING);

474 glDisable(GL_TEXTURE_2D);

475

476 glLineWidth(2.0);

477 glBegin(GL_LINES);

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

479 glVertex3f(-hsz, 0, 0);

480 glVertex3f(hsz, 0, 0);

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

482 glVertex3f(0, 0, -hsz);

483 glVertex3f(0, 0, hsz);

484 glEnd();

485

486 glLineWidth(1.0);

487 glBegin(GL_LINES);

488 glColor4f(0.5, 0.5, 0.5, alpha);

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

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

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

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

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

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

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

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

497 }

498 }

499 glEnd();

500

501 glPopAttrib();

502 }

503

504 static void draw_node(goat3d_node *node)

505 {

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

507 if(!data) return;

508

509 float xform[16];

510 goat3d_get_node_matrix(node, xform, anim_time);

511

512 glPushMatrix();

513 glMultTransposeMatrixf(xform);

514

515 if(data->visible) {

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

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

518

519 draw_mesh(mesh);

520

521 if(data->selected) {

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

523 goat3d_get_mesh_bounds(mesh, bmin, bmax);

524

525 glPushAttrib(GL_ENABLE_BIT);

526 glDisable(GL_LIGHTING);

527

528 glColor3f(0.3, 1, 0.2);

529

530 glBegin(GL_LINE_LOOP);

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

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

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

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

535 glEnd();

536 glBegin(GL_LINE_LOOP);

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

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

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

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

541 glEnd();

542 glBegin(GL_LINES);

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

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

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

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

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

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

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

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

551 glEnd();

552

553 glPopAttrib();

554 }

555 }

556 }

557

558 int num_child = goat3d_get_node_child_count(node);

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

560 draw_node(goat3d_get_node_child(node, i));

561 }

562

563 glPopMatrix();

564 }

565

566 static void draw_mesh(goat3d_mesh *mesh)

567 {

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

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

570

571 const float *color;

572 goat3d_material *mtl = goat3d_get_mesh_mtl(mesh);

573

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

575 glMaterialfv(GL_FRONT_AND_BACK, GL_AMBIENT_AND_DIFFUSE, color);

576 glColor3fv(color);

577 } else {

578 glMaterialfv(GL_FRONT_AND_BACK, GL_AMBIENT_AND_DIFFUSE, white);

579 glColor3fv(white);

580 }

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

582 glMaterialfv(GL_FRONT_AND_BACK, GL_SPECULAR, color);

583 } else {

584 glMaterialfv(GL_FRONT_AND_BACK, GL_SPECULAR, black);

585 }

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

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

588 } else {

589 glMaterialf(GL_FRONT_AND_BACK, GL_SHININESS, 60.0);

590 }

591 // TODO texture

592

593

594 int num_faces = goat3d_get_mesh_face_count(mesh);

595 int num_verts = goat3d_get_mesh_attrib_count(mesh, GOAT3D_MESH_ATTR_VERTEX);

596

597 glEnableClientState(GL_VERTEX_ARRAY);

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

599

600 float *data;

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

602 glEnableClientState(GL_NORMAL_ARRAY);

603 glNormalPointer(GL_FLOAT, 0, data);

604 }

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

606 glEnableClientState(GL_TEXTURE_COORD_ARRAY);

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

608 }

609

610 int *indices;

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

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

613 } else {

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

615 }

616

617 glDisableClientState(GL_VERTEX_ARRAY);

618 glDisableClientState(GL_NORMAL_ARRAY);

619 glDisableClientState(GL_TEXTURE_COORD_ARRAY);

620 }

621

622

623 static float prev_x, prev_y;

624 void GoatViewport::mousePressEvent(QMouseEvent *ev)

625 {

626 prev_x = ev->x();

627 prev_y = ev->y();

628 }

629

630 void GoatViewport::mouseMoveEvent(QMouseEvent *ev)

631 {

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

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

634 prev_x = ev->x();

635 prev_y = ev->y();

636

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

638

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

640 cam_theta += dx * 0.5;

641 cam_phi += dy * 0.5;

642

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

644 if(cam_phi > 90) cam_phi = 90;

645 }

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

647 cam_dist += dy * 0.1;

648

649 if(cam_dist < 0.0) cam_dist = 0.0;

650 }

651 updateGL();

652 }

653

654 static const char *about_str =

655 "GoatView - Goat3D scene file viewer "

657 " "

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

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

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

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

662 " "

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

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

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

666 "GNU General Public License for more details. "

667 " "

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

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

670

671 void GoatView::show_about()

672 {

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

674 }

675

676

677 static int next_pow2(int x)

678 {

679 x--;

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

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

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

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

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

685 return x + 1;

686 }