cubeview.cpp Example File

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 #include "cubeview.h"
 #include "qglcube.h"
 #include "qglteapot.h"

 #include <QtCore/qpropertyanimation.h>

 #include <QtGui/QOpenGLFramebufferObject>

 CubeView::CubeView(QWindow *parent)
     : QGLView(parent)
     , fbo(0)
     , tangle(0.0f)
     , cangle(0.0f)
     , oangle(0.0f)
 {
     QGLBuilder builder;
     builder.newSection(QGL::Faceted);
     builder << QGLCube(1.5f);
     cube = builder.currentNode();
     cube->setObjectName(QLatin1String("Cube"));

     builder.newSection();
     builder << QGLTeapot();
     teapot = builder.currentNode();
     teapot->setObjectName(QLatin1String("Teapot"));

     scene = builder.finalizedSceneNode();
     scene->setParent(this);

     QPropertyAnimation *animation;

     animation = new QPropertyAnimation(this, "teapotAngle", this);
     animation->setStartValue(0.0f);
     animation->setEndValue(360.0f);
     animation->setDuration(1000);
     animation->setLoopCount(-1);
     animation->start();

     animation = new QPropertyAnimation(this, "cubeAngle", this);
     animation->setStartValue(0.0f);
     animation->setEndValue(360.0f);
     animation->setDuration(5000);
     animation->setLoopCount(-1);
     animation->start();

     animation = new QPropertyAnimation(this, "orbitAngle", this);
     animation->setStartValue(0.0f);
     animation->setEndValue(360.0f);
     animation->setDuration(5000);
     animation->setLoopCount(-1);
     animation->start();

     innerCamera = new QGLCamera(this);
 }

 CubeView::~CubeView()
 {
     qtlogo.cleanupResources();
     delete fbo;
 }

 void CubeView::initializeGL(QGLPainter *)
 {
     fbo = new QOpenGLFramebufferObject(512, 512, QOpenGLFramebufferObject::Depth);
     fboSurface.setFramebufferObject(fbo);

     QImage textureImage(QLatin1String(":/qtlogo.png"));
     qtlogo.setImage(textureImage);

     glEnable(GL_BLEND);
 }

 void CubeView::paintGL(QGLPainter *painter)
 {
     painter->modelViewMatrix().push();
     painter->projectionMatrix().push();
     painter->pushSurface(&fboSurface);

     painter->setCamera(innerCamera);
     painter->modelViewMatrix().rotate(tangle, 0.0f, 1.0f, 0.0f);

     painter->setFaceColor(QGL::AllFaces, QColor(170, 202, 0));
     painter->setStandardEffect(QGL::LitMaterial);

     glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
     teapot->draw(painter);

     painter->popSurface();
     painter->projectionMatrix().pop();
     painter->modelViewMatrix().pop();

     painter->modelViewMatrix().rotate(oangle, 0.0f, 1.0f, 0.0f);
     QMatrix4x4 m = painter->modelViewMatrix();
     QVector3D cube1pos(-1.5f, 0.0f, 0.0f);
     QVector3D cube2pos(1.5f, 0.0f, 0.0f);

     if (m.map(cube1pos).z() < m.map(cube2pos).z()) {
         drawCube1(painter, cube1pos);
         drawCube2(painter, cube2pos);
     } else {
         drawCube2(painter, cube2pos);
         drawCube1(painter, cube1pos);
     }
 }

 void CubeView::drawCube1(QGLPainter *painter, const QVector3D &posn)
 {
     painter->modelViewMatrix().push();

     qtlogo.bind();
     painter->setFaceColor(QGL::AllFaces, QColor(202, 100, 0, 150));
     painter->setStandardEffect(QGL::LitDecalTexture2D);

     painter->modelViewMatrix().translate(posn);
     painter->modelViewMatrix().rotate(cangle, 1.0f, -1.0f, 1.0f);

     glCullFace(GL_FRONT);
     glEnable(GL_CULL_FACE);
     cube->draw(painter);
     glCullFace(GL_BACK);
     cube->draw(painter);
     glDisable(GL_CULL_FACE);

     painter->modelViewMatrix().pop();
 }

 void CubeView::drawCube2(QGLPainter *painter, const QVector3D &posn)
 {
     painter->modelViewMatrix().push();

     painter->setFaceColor(QGL::AllFaces, QColor(0, 160, 202, 125));
     painter->setStandardEffect(QGL::LitDecalTexture2D);
     glBindTexture(GL_TEXTURE_2D, fbo->texture());
     glEnable(GL_TEXTURE_2D);

     painter->modelViewMatrix().translate(posn);
     painter->modelViewMatrix().rotate(cangle, 1.0f, 1.0f, 1.0f);

     glCullFace(GL_FRONT);
     glEnable(GL_CULL_FACE);
     cube->draw(painter);
     glCullFace(GL_BACK);
     cube->draw(painter);
     glDisable(GL_CULL_FACE);

     glBindTexture(GL_TEXTURE_2D, 0);
     glDisable(GL_TEXTURE_2D);

     painter->modelViewMatrix().pop();
 }