goat3d: da100bf13f7f goatview/src/goatview.cc

goat3d

view goatview/src/goatview.cc @ 95:da100bf13f7f

[goat3d] implemented animation loading [goatview] working on the animation controls

author	John Tsiombikas <nuclear@member.fsf.org>
date	Mon, 19 May 2014 06:42:40 +0300
parents	21319e71117f
children	32dccb16678f b43d33f3ba69

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 goat3d_free(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_quit = new QAction("&Quit", this);

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

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

165 menu_file->addAction(act_quit);

166

167 // view menu

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

169

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

171 act_use_nodes->setCheckable(true);

172 act_use_nodes->setChecked(use_nodes);

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

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

175 menu_view->addAction(act_use_nodes);

176

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

178 act_use_lighting->setCheckable(true);

179 act_use_lighting->setChecked(use_lighting);

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

181 menu_view->addAction(act_use_lighting);

182

183 // help menu

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

185

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

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

188 menu_help->addAction(act_about);

189 return true;

190 }

191

192 bool GoatView::make_dock()

193 {

194 // ---- side-dock ----

195 QWidget *dock_cont = new QWidget;

196 QVBoxLayout *dock_vbox = new QVBoxLayout;

197 dock_cont->setLayout(dock_vbox);

198

199 QDockWidget *dock = new QDockWidget(this);

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

201 dock->setWidget(dock_cont);

202 addDockWidget(Qt::LeftDockWidgetArea, dock);

203

204 // make the tree view widget

205 treeview = new QTreeView;

206 treeview->setAlternatingRowColors(true);

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

208 dock_vbox->addWidget(treeview);

209

210 scene_model = new SceneModel;

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

212 treeview->setModel(scene_model);

213

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

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

216

217 // misc

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

219 dock_vbox->addWidget(bn_quit);

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

221

222 // ---- bottom dock ----

223 dock_cont = new QWidget;

224 QHBoxLayout *dock_hbox = new QHBoxLayout;

225 dock_cont->setLayout(dock_hbox);

226

227 // animation control box

228 QGroupBox *grp_anim_ctl = new QGroupBox("Animation controls");

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

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

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

232 dock_hbox->addWidget(grp_anim_ctl);

233

234 QVBoxLayout *anim_ctl_box = new QVBoxLayout;

235 grp_anim_ctl->setLayout(anim_ctl_box);

236

237 chk_loop = new QCheckBox("loop");

238 chk_loop->setDisabled(true);

239 chk_loop->setChecked(false);

240 anim_ctl_box->addWidget(chk_loop);

241

242 QToolBar *toolbar_ctl = new QToolBar;

243 anim_ctl_box->addWidget(toolbar_ctl);

244

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

246 act_rewind->setDisabled(true);

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

248 toolbar_ctl->addAction(act_rewind);

249

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

251 act_play->setDisabled(true);

252 toolbar_ctl->addAction(act_play);

253

254 // slider and spinbox

255 QWidget *ssgroup = new QWidget;

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

257 dock_hbox->addWidget(ssgroup);

258

259 QGridLayout *ssgrid = new QGridLayout;

260 //dock_hbox->addLayout(ssgrid);

261 ssgroup->setLayout(ssgrid);

262

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

264 spin_time = new QSpinBox;

265 spin_time->setDisabled(true);

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

267

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

269 slider_time->setDisabled(true);

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

271

272 connect(slider_time, &QSlider::valueChanged,

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

274

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

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

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

278

279 dock = new QDockWidget(this);

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

281 dock->setWidget(dock_cont);

282 addDockWidget(Qt::BottomDockWidgetArea, dock);

283

284 return true;

285 }

286

287 bool GoatView::make_center()

288 {

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

290 setCentralWidget(glview);

291 return true;

292 }

293

294 void GoatView::open_scene()

295 {

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

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

298 if(fname.empty()) {

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

300 return;

301 }

302

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

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

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

306 return;

307 }

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

309 }

310

311 void GoatView::open_anim()

312 {

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

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

315 if(fname.empty()) {

316 statusBar()->showMessage("Abot: No file selected!");

317 return;

318 }

319

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

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

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

323 return;

324 }

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

326 }

327

328

329 // ---- OpenGL viewport ----

330 GoatViewport::GoatViewport(QWidget *main_win)

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

332 {

333 this->main_win = main_win;

334 initialized = false;

335 }

336

337 GoatViewport::~GoatViewport()

338 {

339 }

340

341 QSize GoatViewport::sizeHint() const

342 {

343 return QSize(800, 600);

344 }

345

346 #define CRITICAL(error, detail) \

347 do { \

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

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

350 abort(); \

351 } while(0)

352

353 void GoatViewport::initializeGL()

354 {

355 if(initialized) return;

356 initialized = true;

357

358 init_opengl();

359

360 if(!GLEW_ARB_transpose_matrix) {

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

362 }

363

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

365

366 glEnable(GL_DEPTH_TEST);

367 glEnable(GL_CULL_FACE);

368 if(use_lighting) {

369 glEnable(GL_LIGHTING);

370 }

371 glEnable(GL_LIGHT0);

372

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

374 glLightfv(GL_LIGHT0, GL_POSITION, ldir);

375

376 glEnable(GL_MULTISAMPLE);

377 }

378

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

380 {

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

382 glMatrixMode(GL_PROJECTION);

383 glLoadIdentity();

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

385 }

386

387 void GoatViewport::paintGL()

388 {

389 glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);

390

391 glMatrixMode(GL_MODELVIEW);

392 glLoadIdentity();

393 glTranslatef(0, 0, -cam_dist);

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

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

396

397 draw_grid();

398

399 if(!scene) return;

400

401 if(use_nodes) {

402 int node_count = goat3d_get_node_count(scene);

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

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

405 if(!goat3d_get_node_parent(node)) {

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

407 }

408 }

409 } else {

410 int mesh_count = goat3d_get_mesh_count(scene);

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

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

413 draw_mesh(mesh);

414 }

415 }

416 }

417

418 void GoatViewport::toggle_lighting()

419 {

420 use_lighting = !use_lighting;

421 if(use_lighting) {

422 glEnable(GL_LIGHTING);

423 } else {

424 glDisable(GL_LIGHTING);

425 }

426 updateGL();

427 }

428

429 #ifndef GLEW_ARB_transpose_matrix

430 #error "GLEW_ARB_transpose_matrix undefined?"

431 #endif

432

433 static void draw_grid()

434 {

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

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

437 float sz0 = sz1 / 2.0;

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

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

440

441 glPushAttrib(GL_ENABLE_BIT | GL_DEPTH_BITS);

442

443 glEnable(GL_BLEND);

444 glDepthFunc(GL_ALWAYS);

445

446 glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);

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

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

449

450 glPopAttrib();

451 }

452

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

454 {

455 float hsz = sz / 2.0;

456 float offs = sz / (float)nlines;

457

458 glPushAttrib(GL_ENABLE_BIT);

459 glDisable(GL_LIGHTING);

460 glDisable(GL_TEXTURE_2D);

461

462 glLineWidth(2.0);

463 glBegin(GL_LINES);

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

465 glVertex3f(-hsz, 0, 0);

466 glVertex3f(hsz, 0, 0);

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

468 glVertex3f(0, 0, -hsz);

469 glVertex3f(0, 0, hsz);

470 glEnd();

471

472 glLineWidth(1.0);

473 glBegin(GL_LINES);

474 glColor4f(0.5, 0.5, 0.5, alpha);

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

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

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

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

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

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

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

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

483 }

484 }

485 glEnd();

486

487 glPopAttrib();

488 }

489

490 static void draw_node(goat3d_node *node)

491 {

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

493 if(!data) return;

494

495 float xform[16];

496 goat3d_get_node_matrix(node, xform, anim_time);

497

498 glPushMatrix();

499 glMultTransposeMatrixf(xform);

500

501 if(data->visible) {

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

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

504

505 draw_mesh(mesh);

506

507 if(data->selected) {

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

509 goat3d_get_mesh_bounds(mesh, bmin, bmax);

510

511 glPushAttrib(GL_ENABLE_BIT);

512 glDisable(GL_LIGHTING);

513

514 glColor3f(0.3, 1, 0.2);

515

516 glBegin(GL_LINE_LOOP);

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

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

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

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

521 glEnd();

522 glBegin(GL_LINE_LOOP);

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

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

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

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

527 glEnd();

528 glBegin(GL_LINES);

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

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

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

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

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

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

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

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

537 glEnd();

538

539 glPopAttrib();

540 }

541 }

542 }

543

544 int num_child = goat3d_get_node_child_count(node);

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

546 draw_node(goat3d_get_node_child(node, i));

547 }

548

549 glPopMatrix();

550 }

551

552 static void draw_mesh(goat3d_mesh *mesh)

553 {

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

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

556

557 const float *color;

558 goat3d_material *mtl = goat3d_get_mesh_mtl(mesh);

559

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

561 glMaterialfv(GL_FRONT_AND_BACK, GL_AMBIENT_AND_DIFFUSE, color);

562 glColor3fv(color);

563 } else {

564 glMaterialfv(GL_FRONT_AND_BACK, GL_AMBIENT_AND_DIFFUSE, white);

565 glColor3fv(white);

566 }

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

568 glMaterialfv(GL_FRONT_AND_BACK, GL_SPECULAR, color);

569 } else {

570 glMaterialfv(GL_FRONT_AND_BACK, GL_SPECULAR, black);

571 }

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

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

574 } else {

575 glMaterialf(GL_FRONT_AND_BACK, GL_SHININESS, 60.0);

576 }

577 // TODO texture

578

579

580 int num_faces = goat3d_get_mesh_face_count(mesh);

581 int num_verts = goat3d_get_mesh_attrib_count(mesh, GOAT3D_MESH_ATTR_VERTEX);

582

583 glEnableClientState(GL_VERTEX_ARRAY);

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

585

586 float *data;

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

588 glEnableClientState(GL_NORMAL_ARRAY);

589 glNormalPointer(GL_FLOAT, 0, data);

590 }

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

592 glEnableClientState(GL_TEXTURE_COORD_ARRAY);

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

594 }

595

596 int *indices;

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

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

599 } else {

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

601 }

602

603 glDisableClientState(GL_VERTEX_ARRAY);

604 glDisableClientState(GL_NORMAL_ARRAY);

605 glDisableClientState(GL_TEXTURE_COORD_ARRAY);

606 }

607

608

609 static float prev_x, prev_y;

610 void GoatViewport::mousePressEvent(QMouseEvent *ev)

611 {

612 prev_x = ev->x();

613 prev_y = ev->y();

614 }

615

616 void GoatViewport::mouseMoveEvent(QMouseEvent *ev)

617 {

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

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

620 prev_x = ev->x();

621 prev_y = ev->y();

622

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

624

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

626 cam_theta += dx * 0.5;

627 cam_phi += dy * 0.5;

628

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

630 if(cam_phi > 90) cam_phi = 90;

631 }

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

633 cam_dist += dy * 0.1;

634

635 if(cam_dist < 0.0) cam_dist = 0.0;

636 }

637 updateGL();

638 }

639

640 static const char *about_str =

641 "GoatView - Goat3D scene file viewer "

643 " "

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

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

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

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

648 " "

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

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

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

652 "GNU General Public License for more details. "

653 " "

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

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

656

657 void GoatView::show_about()

658 {

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

660 }

661

662

663 static int next_pow2(int x)

664 {

665 x--;

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

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

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

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

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

671 return x + 1;

672 }