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+/****************************************************************************
+**
+** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
+** Contact: Qt Software Information (qt-info@nokia.com)
+**
+** This file is part of the examples of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** No Commercial Usage
+** This file contains pre-release code and may not be distributed.
+** You may use this file in accordance with the terms and conditions
+** contained in the either Technology Preview License Agreement or the
+** Beta Release License Agreement.
+**
+** GNU Lesser General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU Lesser
+** General Public License version 2.1 as published by the Free Software
+** Foundation and appearing in the file LICENSE.LGPL included in the
+** packaging of this file. Please review the following information to
+** ensure the GNU Lesser General Public License version 2.1 requirements
+** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
+**
+** In addition, as a special exception, Nokia gives you certain
+** additional rights. These rights are described in the Nokia Qt LGPL
+** Exception version 1.0, included in the file LGPL_EXCEPTION.txt in this
+** package.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU
+** General Public License version 3.0 as published by the Free Software
+** Foundation and appearing in the file LICENSE.GPL included in the
+** packaging of this file. Please review the following information to
+** ensure the GNU General Public License version 3.0 requirements will be
+** met: http://www.gnu.org/copyleft/gpl.html.
+**
+** If you are unsure which license is appropriate for your use, please
+** contact the sales department at qt-sales@nokia.com.
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#include <QtGui/QImage>
+#include "glwidget.h"
+
+#include <math.h>
+
+#ifndef GL_MULTISAMPLE
+#define GL_MULTISAMPLE 0x809D
+#endif
+
+GLWidget::GLWidget(QWidget *parent)
+ : QGLWidget(QGLFormat(QGL::SampleBuffers|QGL::AlphaChannel), parent)
+{
+ setWindowTitle(tr("OpenGL framebuffer objects"));
+ makeCurrent();
+ fbo = new QGLFramebufferObject(1024, 1024);
+ 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);
+
+ 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
+}
+
+GLWidget::~GLWidget()
+{
+ delete[] wave;
+ glDeleteLists(tile_list, 1);
+ delete fbo;
+}
+
+void GLWidget::paintEvent(QPaintEvent *)
+{
+ draw();
+}
+
+void GLWidget::draw()
+{
+ QPainter p(this); // used for text overlay
+
+ // save the GL state set for QPainter
+ saveGLState();
+
+ // render the 'bubbles.svg' file into our framebuffer object
+ QPainter fbo_painter(fbo);
+ svg_renderer->render(&fbo_painter);
+ fbo_painter.end();
+
+ // 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(), height());
+ glEnable(GL_BLEND);
+ glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
+
+ glBindTexture(GL_TEXTURE_2D, fbo->texture());
+ glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
+ glEnable(GL_TEXTURE_2D);
+ glEnable(GL_MULTISAMPLE);
+ glEnable(GL_CULL_FACE);
+
+ // 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();
+
+ // 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 framebuffer object 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();
+}
+
+#define PI 3.14159
+
+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 ? scale + scale*0.01f : scale-scale*0.01f;
+ rot_z += 0.3f;
+ rot_x += 0.1f;
+
+ int dx, dy; // disturbance point
+ float s, v, W, t;
+ int i, j;
+ static float wt[128][128];
+ const int width = logo.width();
+ const int AMP = 5;
+
+ dx = dy = width >> 1;
+
+ W = .3f;
+ v = -4; // wave speed
+
+ for (i = 0; i < width; ++i) {
+ for ( j = 0; j < width; ++j) {
+ s = sqrt((double) ((j - dx) * (j - dx) + (i - dy) * (i - dy)));
+ wt[i][j] += 0.1f;
+ t = s / v;
+ if (s != 0)
+ wave[i*width + j] = AMP * sin(2 * PI * W * (wt[i][j] + t)) / (0.2*(s + 2));
+ else
+ wave[i*width + j] = AMP * sin(2 * PI * W * (wt[i][j] + t));
+ }
+ }
+}
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