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| |
| #include <QtGui/QImage> |
| #include <qmath.h> |
| #include "glwidget.h" |
| |
| #ifndef GL_MULTISAMPLE |
| #define GL_MULTISAMPLE 0x809D |
| #endif |
| |
| GLWidget::GLWidget(QWidget *parent) |
| : QGLWidget(QGLFormat(QGL::SampleBuffers), parent) |
| { |
| setWindowTitle(tr("OpenGL pbuffers 2")); |
| |
| pbuffer = new QGLPixelBuffer(1024, 1024, format(), this); |
| |
| rot_x = rot_y = rot_z = 0.0f; |
| scale = 0.1f; |
| anim = new QTimeLine(750, this); |
| anim->setUpdateInterval(20); |
| connect(anim, SIGNAL(valueChanged(qreal)), SLOT(animate(qreal))); |
| connect(anim, SIGNAL(finished()), SLOT(animFinished())); |
| |
| svg_renderer = new QSvgRenderer(QLatin1String(":/res/bubbles.svg"), this); |
| connect(svg_renderer, SIGNAL(repaintNeeded()), this, SLOT(draw())); |
| |
| logo = QImage(":/res/designer.png"); |
| logo = logo.convertToFormat(QImage::Format_ARGB32); |
| |
| makeCurrent(); // need a current context to create the display list |
| tile_list = glGenLists(1); |
| glNewList(tile_list, GL_COMPILE); |
| glBegin(GL_QUADS); |
| { |
| glTexCoord2f(0.0f, 0.0f); glVertex3f(-1.0f, -1.0f, 1.0f); |
| glTexCoord2f(1.0f, 0.0f); glVertex3f( 1.0f, -1.0f, 1.0f); |
| glTexCoord2f(1.0f, 1.0f); glVertex3f( 1.0f, 1.0f, 1.0f); |
| glTexCoord2f(0.0f, 1.0f); glVertex3f(-1.0f, 1.0f, 1.0f); |
| |
| glTexCoord2f(1.0f, 0.0f); glVertex3f(-1.0f, -1.0f, -1.0f); |
| glTexCoord2f(1.0f, 1.0f); glVertex3f(-1.0f, 1.0f, -1.0f); |
| glTexCoord2f(0.0f, 1.0f); glVertex3f( 1.0f, 1.0f, -1.0f); |
| glTexCoord2f(0.0f, 0.0f); glVertex3f( 1.0f, -1.0f, -1.0f); |
| |
| glTexCoord2f(0.0f, 1.0f); glVertex3f(-1.0f, 1.0f, -1.0f); |
| glTexCoord2f(0.0f, 0.0f); glVertex3f(-1.0f, 1.0f, 1.0f); |
| glTexCoord2f(1.0f, 0.0f); glVertex3f( 1.0f, 1.0f, 1.0f); |
| glTexCoord2f(1.0f, 1.0f); glVertex3f( 1.0f, 1.0f, -1.0f); |
| |
| glTexCoord2f(1.0f, 1.0f); glVertex3f(-1.0f, -1.0f, -1.0f); |
| glTexCoord2f(0.0f, 1.0f); glVertex3f( 1.0f, -1.0f, -1.0f); |
| glTexCoord2f(0.0f, 0.0f); glVertex3f( 1.0f, -1.0f, 1.0f); |
| glTexCoord2f(1.0f, 0.0f); glVertex3f(-1.0f, -1.0f, 1.0f); |
| |
| glTexCoord2f(1.0f, 0.0f); glVertex3f( 1.0f, -1.0f, -1.0f); |
| glTexCoord2f(1.0f, 1.0f); glVertex3f( 1.0f, 1.0f, -1.0f); |
| glTexCoord2f(0.0f, 1.0f); glVertex3f( 1.0f, 1.0f, 1.0f); |
| glTexCoord2f(0.0f, 0.0f); glVertex3f( 1.0f, -1.0f, 1.0f); |
| |
| glTexCoord2f(0.0f, 0.0f); glVertex3f(-1.0f, -1.0f, -1.0f); |
| glTexCoord2f(1.0f, 0.0f); glVertex3f(-1.0f, -1.0f, 1.0f); |
| glTexCoord2f(1.0f, 1.0f); glVertex3f(-1.0f, 1.0f, 1.0f); |
| glTexCoord2f(0.0f, 1.0f); glVertex3f(-1.0f, 1.0f, -1.0f); |
| } |
| glEnd(); |
| glEndList(); |
| |
| wave = new GLfloat[logo.width()*logo.height()]; |
| memset(wave, 0, logo.width()*logo.height()); |
| startTimer(30); // wave timer |
| |
| pbuffer->makeCurrent(); |
| dynamicTexture = pbuffer->generateDynamicTexture(); |
| |
| // bind the dynamic texture to the pbuffer - this is a no-op under X11 |
| hasDynamicTextureUpdate = pbuffer->bindToDynamicTexture(dynamicTexture); |
| } |
| |
| GLWidget::~GLWidget() |
| { |
| delete[] wave; |
| glDeleteLists(tile_list, 1); |
| pbuffer->releaseFromDynamicTexture(); |
| glDeleteTextures(1, &dynamicTexture); |
| delete pbuffer; |
| } |
| |
| void GLWidget::paintEvent(QPaintEvent *) |
| { |
| draw(); |
| } |
| |
| void GLWidget::draw() |
| { |
| QPainter p(this); // used for text overlay |
| |
| // save the GL state set for QPainter |
| p.beginNativePainting(); |
| saveGLState(); |
| |
| // render the 'bubbles.svg' file into our pbuffer |
| QPainter pbuffer_painter(pbuffer); |
| svg_renderer->render(&pbuffer_painter); |
| pbuffer_painter.end(); |
| glFlush(); |
| |
| if (!hasDynamicTextureUpdate) |
| pbuffer->updateDynamicTexture(dynamicTexture); |
| |
| makeCurrent(); |
| // draw into the GL widget |
| glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT); |
| glMatrixMode(GL_PROJECTION); |
| glLoadIdentity(); |
| glFrustum(-1, 1, -1, 1, 10, 100); |
| glTranslatef(0.0f, 0.0f, -15.0f); |
| glMatrixMode(GL_MODELVIEW); |
| glLoadIdentity(); |
| glViewport(0, 0, width() * devicePixelRatio(), height() * devicePixelRatio()); |
| |
| glBindTexture(GL_TEXTURE_2D, dynamicTexture); |
| glEnable(GL_TEXTURE_2D); |
| glEnable(GL_MULTISAMPLE); |
| glEnable(GL_CULL_FACE); |
| glEnable(GL_BLEND); |
| glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA); |
| |
| // draw background |
| glPushMatrix(); |
| glScalef(1.7f, 1.7f, 1.7f); |
| glColor4f(1.0f, 1.0f, 1.0f, 1.0f); |
| glCallList(tile_list); |
| glPopMatrix(); |
| |
| const int w = logo.width(); |
| const int h = logo.height(); |
| |
| glRotatef(rot_x, 1.0f, 0.0f, 0.0f); |
| glRotatef(rot_y, 0.0f, 1.0f, 0.0f); |
| glRotatef(rot_z, 0.0f, 0.0f, 1.0f); |
| glScalef(scale/w, scale/w, scale/w); |
| |
| glDepthFunc(GL_LESS); |
| glEnable(GL_DEPTH_TEST); |
| |
| // draw the Qt icon |
| glTranslatef(-w+1, -h+1, 0.0f); |
| for (int y=h-1; y>=0; --y) { |
| uint *p = (uint*) logo.scanLine(y); |
| uint *end = p + w; |
| int x = 0; |
| while (p < end) { |
| glColor4ub(qRed(*p), qGreen(*p), qBlue(*p), uchar(qAlpha(*p)*.9)); |
| glTranslatef(0.0f, 0.0f, wave[y*w+x]); |
| if (qAlpha(*p) > 128) |
| glCallList(tile_list); |
| glTranslatef(0.0f, 0.0f, -wave[y*w+x]); |
| glTranslatef(2.0f, 0.0f, 0.0f); |
| ++x; |
| ++p; |
| } |
| glTranslatef(-w*2.0f, 2.0f, 0.0f); |
| } |
| |
| // restore the GL state that QPainter expects |
| restoreGLState(); |
| p.endNativePainting(); |
| |
| // draw the overlayed text using QPainter |
| p.setPen(QColor(197, 197, 197, 157)); |
| p.setBrush(QColor(197, 197, 197, 127)); |
| p.drawRect(QRect(0, 0, width(), 50)); |
| p.setPen(Qt::black); |
| p.setBrush(Qt::NoBrush); |
| const QString str1(tr("A simple OpenGL pbuffer example.")); |
| const QString str2(tr("Use the mouse wheel to zoom, press buttons and move mouse to rotate, double-click to flip.")); |
| QFontMetrics fm(p.font()); |
| p.drawText(width()/2 - fm.width(str1)/2, 20, str1); |
| p.drawText(width()/2 - fm.width(str2)/2, 20 + fm.lineSpacing(), str2); |
| } |
| |
| void GLWidget::mousePressEvent(QMouseEvent *e) |
| { |
| anchor = e->pos(); |
| } |
| |
| void GLWidget::mouseMoveEvent(QMouseEvent *e) |
| { |
| QPoint diff = e->pos() - anchor; |
| if (e->buttons() & Qt::LeftButton) { |
| rot_x += diff.y()/5.0f; |
| rot_y += diff.x()/5.0f; |
| } else if (e->buttons() & Qt::RightButton) { |
| rot_z += diff.x()/5.0f; |
| } |
| |
| anchor = e->pos(); |
| draw(); |
| } |
| |
| void GLWidget::wheelEvent(QWheelEvent *e) |
| { |
| e->delta() > 0 ? scale += scale*0.1f : scale -= scale*0.1f; |
| draw(); |
| } |
| |
| void GLWidget::mouseDoubleClickEvent(QMouseEvent *) |
| { |
| anim->start(); |
| } |
| |
| void GLWidget::animate(qreal val) |
| { |
| rot_y = val * 180; |
| draw(); |
| } |
| |
| void GLWidget::animFinished() |
| { |
| if (anim->direction() == QTimeLine::Forward) |
| anim->setDirection(QTimeLine::Backward); |
| else |
| anim->setDirection(QTimeLine::Forward); |
| } |
| |
| void GLWidget::saveGLState() |
| { |
| glPushAttrib(GL_ALL_ATTRIB_BITS); |
| glMatrixMode(GL_PROJECTION); |
| glPushMatrix(); |
| glMatrixMode(GL_MODELVIEW); |
| glPushMatrix(); |
| } |
| |
| void GLWidget::restoreGLState() |
| { |
| glMatrixMode(GL_PROJECTION); |
| glPopMatrix(); |
| glMatrixMode(GL_MODELVIEW); |
| glPopMatrix(); |
| glPopAttrib(); |
| } |
| |
| void GLWidget::timerEvent(QTimerEvent *) |
| { |
| if (QApplication::mouseButtons() != 0) |
| return; |
| |
| static bool scale_in = true; |
| |
| if (scale_in && scale > 35.0f) |
| scale_in = false; |
| else if (!scale_in && scale < .5f) |
| scale_in = true; |
| |
| scale *= scale_in ? 1.01f : 0.99f; |
| rot_z += 0.3f; |
| rot_x += 0.1f; |
| |
| static float wt = 0.0; |
| wt += 0.1f; |
| |
| const int width = logo.width(); |
| const int dx = width >> 1, dy = dx; // disturbance point |
| const float v = -4; // wave speed |
| const float W = .3f; |
| const int AMP = 5; |
| |
| for (int i = 0; i < width; ++i) { |
| for (int j = 0; j < width; ++j) { |
| const float s = hypot(j - dx, i - dy); |
| const double raw = AMP * sin(2 * M_PI * W * (wt + s / v)); |
| if (s != 0) |
| wave[i * width + j] = raw / (0.2 * (s + 2)); |
| else |
| wave[i * width + j] = raw; |
| } |
| } |
| } |