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Diffstat (limited to 'examples/opengl/pbuffers2/glwidget.cpp')
-rw-r--r-- | examples/opengl/pbuffers2/glwidget.cpp | 326 |
1 files changed, 326 insertions, 0 deletions
diff --git a/examples/opengl/pbuffers2/glwidget.cpp b/examples/opengl/pbuffers2/glwidget.cpp new file mode 100644 index 0000000..fa37946 --- /dev/null +++ b/examples/opengl/pbuffers2/glwidget.cpp @@ -0,0 +1,326 @@ +/**************************************************************************** +** +** 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), 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 + saveGLState(); + + // render the 'bubbles.svg' file into our pbuffer + QPainter pbuffer_painter(pbuffer); + svg_renderer->render(&pbuffer_painter); + pbuffer_painter.end(); + glFlush(); + + // rendering directly to a texture is not supported on X11 and + // some Windows implementations, unfortunately + 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(), height()); + + 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(); + + // 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(); +} + +#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)); + } + } +} |