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<pre><span class="comment"> /****************************************************************************
 **
 ** Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies).
 ** All rights reserved.
 ** Contact: Nokia Corporation (qt-info@nokia.com)
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 ** This file is part of the examples of the Qt Toolkit.
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 #include &quot;glwidget.h&quot;
 #include &lt;math.h&gt;

 #include &quot;cube.h&quot;

 #include &lt;QGLPixelBuffer&gt;

 #ifndef GL_MULTISAMPLE
 #define GL_MULTISAMPLE  0x809D
 #endif

 static GLfloat colorArray[][4] = {
     {0.243f, 0.423f, 0.125f, 1.0f},
     {0.176f, 0.31f, 0.09f, 1.0f},
     {0.4f, 0.69f, 0.212f, 1.0f},
     {0.317f, 0.553f, 0.161f, 1.0f}
 };

 GLWidget::GLWidget(QWidget *parent)
     : QGLWidget(QGLFormat(QGL::SampleBuffers), parent)
     , geom(0)
     , cube(0)
 {
     <span class="comment">// create the pbuffer</span>
     pbuffer = new QGLPixelBuffer(QSize(512, 512), format(), this);
     setWindowTitle(tr(&quot;OpenGL pbuffers&quot;));
     initializeGeometry();
 }

 GLWidget::~GLWidget()
 {
     pbuffer-&gt;releaseFromDynamicTexture();
     glDeleteTextures(1, &amp;dynamicTexture);
     delete pbuffer;

     qDeleteAll(cubes);
     qDeleteAll(tiles);
     delete cube;
 }

 void GLWidget::initializeGL()
 {
     initCommon();
     glShadeModel(GL_SMOOTH);
     glEnable(GL_LIGHTING);
     glEnable(GL_LIGHT0);
     static GLfloat lightPosition[4] = { 0.5, 5.0, 7.0, 1.0 };
     glLightfv(GL_LIGHT0, GL_POSITION, lightPosition);
     initPbuffer();
     cube-&gt;startAnimation();
     connect(cube, SIGNAL(changed()), this, SLOT(update()));
     for (int i = 0; i &lt; 3; ++i)
     {
         cubes[i]-&gt;startAnimation();
         connect(cubes[i], SIGNAL(changed()), this, SLOT(update()));
     }
 }

 void GLWidget::paintGL()
 {
     pbuffer-&gt;makeCurrent();
     drawPbuffer();
     <span class="comment">// On direct render platforms, drawing onto the pbuffer context above</span>
     <span class="comment">// automatically updates the dynamic texture.  For cases where rendering</span>
     <span class="comment">// directly to a texture is not supported, explicitly copy.</span>
     if (!hasDynamicTextureUpdate)
         pbuffer-&gt;updateDynamicTexture(dynamicTexture);
     makeCurrent();

     <span class="comment">// Use the pbuffer as a texture to render the scene</span>
     glBindTexture(GL_TEXTURE_2D, dynamicTexture);

     <span class="comment">// set up to render the scene</span>
     glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
     glLoadIdentity();
     glTranslatef(0.0f, 0.0f, -10.0f);

     <span class="comment">// draw the background</span>
     glPushMatrix();
     glScalef(aspect, 1.0f, 1.0f);
     for (int i = 0; i &lt; tiles.count(); ++i)
         tiles[i]-&gt;draw();
     glPopMatrix();

     <span class="comment">// draw the bouncing cubes</span>
     for (int i = 0; i &lt; cubes.count(); ++i)
         cubes[i]-&gt;draw();
 }

 void GLWidget::initializeGeometry()
 {
     geom = new Geometry();
     CubeBuilder cBuilder(geom, 0.5);
     cBuilder.setColor(QColor(255, 255, 255, 212));
     <span class="comment">// build the 3 bouncing, spinning cubes</span>
     for (int i = 0; i &lt; 3; ++i)
         cubes.append(cBuilder.newCube(QVector3D((float)(i-1), -1.5f, 5 - i)));

     <span class="comment">// build the spinning cube which goes in the dynamic texture</span>
     cube = cBuilder.newCube();
     cube-&gt;removeBounce();

     <span class="comment">// build the background tiles</span>
     TileBuilder tBuilder(geom);
     tBuilder.setColor(QColor(Qt::white));
     for (int c = -2; c &lt;= +2; ++c)
         for (int r = -2; r &lt;= +2; ++r)
             tiles.append(tBuilder.newTile(QVector3D(c, r, 0)));

     <span class="comment">// graded backdrop for the pbuffer scene</span>
     TileBuilder bBuilder(geom, 0.0f, 2.0f);
     bBuilder.setColor(QColor(102, 176, 54, 210));
     backdrop = bBuilder.newTile(QVector3D(0.0f, 0.0f, -1.5f));
     backdrop-&gt;setColors(colorArray);
 }

 void GLWidget::initCommon()
 {
     qglClearColor(QColor(Qt::darkGray));

     glEnable(GL_DEPTH_TEST);
     glEnable(GL_CULL_FACE);
     glEnable(GL_MULTISAMPLE);

     glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
     glEnable(GL_BLEND);

     glEnable(GL_TEXTURE_2D);

     geom-&gt;loadArrays();
 }

 void GLWidget::perspectiveProjection()
 {
     glMatrixMode(GL_PROJECTION);
     glLoadIdentity();
 #ifdef QT_OPENGL_ES
     glFrustumf(-aspect, +aspect, -1.0, +1.0, 4.0, 15.0);
 #else
     glFrustum(-aspect, +aspect, -1.0, +1.0, 4.0, 15.0);
 #endif
     glMatrixMode(GL_MODELVIEW);
 }

 void GLWidget::orthographicProjection()
 {
     glMatrixMode(GL_PROJECTION);
     glLoadIdentity();
 #ifdef QT_OPENGL_ES
     glOrthof(-1.0, +1.0, -1.0, +1.0, -90.0, +90.0);
 #else
     glOrtho(-1.0, +1.0, -1.0, +1.0, -90.0, +90.0);
 #endif
     glMatrixMode(GL_MODELVIEW);
 }

 void GLWidget::resizeGL(int width, int height)
 {
     glViewport(0, 0, width, height);
     aspect = (qreal)width / (qreal)(height ? height : 1);
     perspectiveProjection();
 }

 void GLWidget::drawPbuffer()
 {
     orthographicProjection();

     glClearColor(0.0f, 0.0f, 0.0f, 1.0f);
     glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);

     glDisable(GL_TEXTURE_2D);
     backdrop-&gt;draw();
     glEnable(GL_TEXTURE_2D);

     glBindTexture(GL_TEXTURE_2D, cubeTexture);
     glDisable(GL_CULL_FACE);
     cube-&gt;draw();
     glEnable(GL_CULL_FACE);

     glFlush();
 }

 void GLWidget::initPbuffer()
 {
     pbuffer-&gt;makeCurrent();

     cubeTexture = bindTexture(QImage(&quot;:res/cubelogo.png&quot;));

     initCommon();

     <span class="comment">// generate a texture that has the same size/format as the pbuffer</span>
     dynamicTexture = pbuffer-&gt;generateDynamicTexture();

     <span class="comment">// bind the dynamic texture to the pbuffer - this is a no-op under X11</span>
     hasDynamicTextureUpdate = pbuffer-&gt;bindToDynamicTexture(dynamicTexture);
     makeCurrent();
 }

 void GLWidget::setAnimationPaused(bool enable)
 {
     cube-&gt;setAnimationPaused(enable);
     for (int i = 0; i &lt; 3; ++i)
         cubes[i]-&gt;setAnimationPaused(enable);
 }</pre>
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