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Branched from the monolithic repo, Qt master branch, at commit
896db169ea224deb96c59ce8af800d019de63f12

1 files changed, 1085 insertions, 0 deletions

diff --git a/demos/boxes/scene.cpp b/demos/boxes/scene.cpp
new file mode 100644
index 0000000000..85c9a5be70
--- /dev/null
+++ b/demos/boxes/scene.cpp
@@ -0,0 +1,1085 @@
+/****************************************************************************
+**
+** Copyright (C) 2011 Nokia Corporation and/or its subsidiary(-ies).
+** All rights reserved.
+** Contact: Nokia Corporation (qt-info@nokia.com)
+**
+** This file is part of the demonstration applications 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 Technology Preview License Agreement accompanying
+** this package.
+**
+** 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 1.1, included in the file LGPL_EXCEPTION.txt in this package.
+**
+** If you have questions regarding the use of this file, please contact
+** Nokia at qt-info@nokia.com.
+**
+**
+**
+**
+**
+**
+**
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#include <QDebug>
+#include "scene.h"
+#include <QtGui/qmatrix4x4.h>
+#include <QtGui/qvector3d.h>
+
+#include "3rdparty/fbm.h"
+
+void checkGLErrors(const QString& prefix)
+{
+    switch (glGetError()) {
+    case GL_NO_ERROR:
+        //qDebug() << prefix << tr("No error.");
+        break;
+    case GL_INVALID_ENUM:
+        qDebug() << prefix << QObject::tr("Invalid enum.");
+        break;
+    case GL_INVALID_VALUE:
+        qDebug() << prefix << QObject::tr("Invalid value.");
+        break;
+    case GL_INVALID_OPERATION:
+        qDebug() << prefix << QObject::tr("Invalid operation.");
+        break;
+    case GL_STACK_OVERFLOW:
+        qDebug() << prefix << QObject::tr("Stack overflow.");
+        break;
+    case GL_STACK_UNDERFLOW:
+        qDebug() << prefix << QObject::tr("Stack underflow.");
+        break;
+    case GL_OUT_OF_MEMORY:
+        qDebug() << prefix << QObject::tr("Out of memory.");
+        break;
+    default:
+        qDebug() << prefix << QObject::tr("Unknown error.");
+        break;
+    }
+}
+
+//============================================================================//
+//                                  ColorEdit                                 //
+//============================================================================//
+
+ColorEdit::ColorEdit(QRgb initialColor, int id)
+    : m_color(initialColor), m_id(id)
+{
+    QHBoxLayout *layout = new QHBoxLayout;
+    setLayout(layout);
+    layout->setContentsMargins(0, 0, 0, 0);
+
+    m_lineEdit = new QLineEdit(QString::number(m_color, 16));
+    layout->addWidget(m_lineEdit);
+
+    m_button = new QFrame;
+    QPalette palette = m_button->palette();
+    palette.setColor(QPalette::Window, QColor(m_color));
+    m_button->setPalette(palette);
+    m_button->setAutoFillBackground(true);
+    m_button->setMinimumSize(32, 0);
+    m_button->setSizePolicy(QSizePolicy::Fixed, QSizePolicy::Preferred);
+    m_button->setFrameStyle(QFrame::StyledPanel | QFrame::Sunken);
+    layout->addWidget(m_button);
+
+    connect(m_lineEdit, SIGNAL(editingFinished()), this, SLOT(editDone()));
+}
+
+void ColorEdit::editDone()
+{
+    bool ok;
+    QRgb newColor = m_lineEdit->text().toUInt(&ok, 16);
+    if (ok)
+        setColor(newColor);
+}
+
+void ColorEdit::mousePressEvent(QMouseEvent *event)
+{
+    if (event->button() == Qt::LeftButton) {
+        QColor color(m_color);
+        QColorDialog dialog(color, 0);
+        dialog.setOption(QColorDialog::ShowAlphaChannel, true);
+// The ifdef block is a workaround for the beta, TODO: remove when bug 238525 is fixed
+#ifdef Q_WS_MAC
+        dialog.setOption(QColorDialog::DontUseNativeDialog, true);
+#endif
+        dialog.move(280, 120);
+        if (dialog.exec() == QDialog::Rejected)
+            return;
+        QRgb newColor = dialog.selectedColor().rgba();
+        if (newColor == m_color)
+            return;
+        setColor(newColor);
+    }
+}
+
+void ColorEdit::setColor(QRgb color)
+{
+    m_color = color;
+    m_lineEdit->setText(QString::number(m_color, 16)); // "Clean up" text
+    QPalette palette = m_button->palette();
+    palette.setColor(QPalette::Window, QColor(m_color));
+    m_button->setPalette(palette);
+    emit colorChanged(m_color, m_id);
+}
+
+//============================================================================//
+//                                  FloatEdit                                 //
+//============================================================================//
+
+FloatEdit::FloatEdit(float initialValue, int id)
+    : m_value(initialValue), m_id(id)
+{
+    QHBoxLayout *layout = new QHBoxLayout;
+    setLayout(layout);
+    layout->setContentsMargins(0, 0, 0, 0);
+
+    m_lineEdit = new QLineEdit(QString::number(m_value));
+    layout->addWidget(m_lineEdit);
+
+    connect(m_lineEdit, SIGNAL(editingFinished()), this, SLOT(editDone()));
+}
+
+void FloatEdit::editDone()
+{
+    bool ok;
+    float newValue = m_lineEdit->text().toFloat(&ok);
+    if (ok) {
+        m_value = newValue;
+        m_lineEdit->setText(QString::number(m_value)); // "Clean up" text
+        emit valueChanged(m_value, m_id);
+    }
+}
+
+//============================================================================//
+//                           TwoSidedGraphicsWidget                           //
+//============================================================================//
+
+TwoSidedGraphicsWidget::TwoSidedGraphicsWidget(QGraphicsScene *scene)
+    : QObject(scene)
+    , m_current(0)
+    , m_angle(0)
+    , m_delta(0)
+{
+    for (int i = 0; i < 2; ++i)
+        m_proxyWidgets[i] = 0;
+}
+
+void TwoSidedGraphicsWidget::setWidget(int index, QWidget *widget)
+{
+    if (index < 0 || index >= 2)
+	{
+		qWarning("TwoSidedGraphicsWidget::setWidget: Index out of bounds, index == %d", index);
+		return;
+	}
+
+    GraphicsWidget *proxy = new GraphicsWidget;
+    proxy->setWidget(widget);
+
+    if (m_proxyWidgets[index])
+        delete m_proxyWidgets[index];
+    m_proxyWidgets[index] = proxy;
+
+    proxy->setCacheMode(QGraphicsItem::ItemCoordinateCache);
+    proxy->setZValue(1e30); // Make sure the dialog is drawn on top of all other (OpenGL) items
+
+    if (index != m_current)
+        proxy->setVisible(false);
+
+    qobject_cast<QGraphicsScene *>(parent())->addItem(proxy);
+}
+
+QWidget *TwoSidedGraphicsWidget::widget(int index)
+{
+    if (index < 0 || index >= 2)
+	{
+		qWarning("TwoSidedGraphicsWidget::widget: Index out of bounds, index == %d", index);
+		return 0;
+	}
+    return m_proxyWidgets[index]->widget();
+}
+
+void TwoSidedGraphicsWidget::flip()
+{
+    m_delta = (m_current == 0 ? 9 : -9);
+    animateFlip();
+}
+
+void TwoSidedGraphicsWidget::animateFlip()
+{
+    m_angle += m_delta;
+    if (m_angle == 90) {
+        int old = m_current;
+        m_current ^= 1;
+        m_proxyWidgets[old]->setVisible(false);
+        m_proxyWidgets[m_current]->setVisible(true);
+        m_proxyWidgets[m_current]->setGeometry(m_proxyWidgets[old]->geometry());
+    }
+
+    QRectF r = m_proxyWidgets[m_current]->boundingRect();
+    m_proxyWidgets[m_current]->setTransform(QTransform()
+        .translate(r.width() / 2, r.height() / 2)
+        .rotate(m_angle - 180 * m_current, Qt::YAxis)
+        .translate(-r.width() / 2, -r.height() / 2));
+
+    if ((m_current == 0 && m_angle > 0) || (m_current == 1 && m_angle < 180))
+        QTimer::singleShot(25, this, SLOT(animateFlip()));
+}
+
+QVariant GraphicsWidget::itemChange(GraphicsItemChange change, const QVariant &value)
+{
+    if (change == ItemPositionChange && scene()) {
+        QRectF rect = boundingRect();
+        QPointF pos = value.toPointF();
+        QRectF sceneRect = scene()->sceneRect();
+        if (pos.x() + rect.left() < sceneRect.left())
+            pos.setX(sceneRect.left() - rect.left());
+        else if (pos.x() + rect.right() >= sceneRect.right())
+            pos.setX(sceneRect.right() - rect.right());
+        if (pos.y() + rect.top() < sceneRect.top())
+            pos.setY(sceneRect.top() - rect.top());
+        else if (pos.y() + rect.bottom() >= sceneRect.bottom())
+            pos.setY(sceneRect.bottom() - rect.bottom());
+        return pos;
+    }
+    return QGraphicsProxyWidget::itemChange(change, value);
+}
+
+void GraphicsWidget::resizeEvent(QGraphicsSceneResizeEvent *event)
+{
+    setCacheMode(QGraphicsItem::NoCache);
+    setCacheMode(QGraphicsItem::ItemCoordinateCache);
+    QGraphicsProxyWidget::resizeEvent(event);
+}
+
+void GraphicsWidget::paint(QPainter *painter, const QStyleOptionGraphicsItem *option, QWidget *widget)
+{
+    painter->setRenderHint(QPainter::Antialiasing, false);
+    QGraphicsProxyWidget::paint(painter, option, widget);
+    //painter->setRenderHint(QPainter::Antialiasing, true);
+}
+
+//============================================================================//
+//                             RenderOptionsDialog                            //
+//============================================================================//
+
+RenderOptionsDialog::RenderOptionsDialog()
+    : QDialog(0, Qt::CustomizeWindowHint | Qt::WindowTitleHint)
+{
+    setWindowOpacity(0.75);
+    setWindowTitle(tr("Options (double click to flip)"));
+    QGridLayout *layout = new QGridLayout;
+    setLayout(layout);
+    layout->setColumnStretch(1, 1);
+
+    int row = 0;
+
+    QCheckBox *check = new QCheckBox(tr("Dynamic cube map"));
+    check->setCheckState(Qt::Unchecked);
+    // Dynamic cube maps are only enabled when multi-texturing and render to texture are available.
+    check->setEnabled(glActiveTexture && glGenFramebuffersEXT);
+    connect(check, SIGNAL(stateChanged(int)), this, SIGNAL(dynamicCubemapToggled(int)));
+    layout->addWidget(check, 0, 0, 1, 2);
+    ++row;
+
+    QPalette palette;
+
+    // Load all .par files
+    // .par files have a simple syntax for specifying user adjustable uniform variables.
+    QSet<QByteArray> uniforms;
+    QList<QString> filter = QStringList("*.par");
+    QList<QFileInfo> files = QDir(":/res/boxes/").entryInfoList(filter, QDir::Files | QDir::Readable);
+
+    foreach (QFileInfo fileInfo, files) {
+        QFile file(fileInfo.absoluteFilePath());
+        if (file.open(QIODevice::ReadOnly)) {
+            while (!file.atEnd()) {
+                QList<QByteArray> tokens = file.readLine().simplified().split(' ');
+                QList<QByteArray>::const_iterator it = tokens.begin();
+                if (it == tokens.end())
+                    continue;
+                QByteArray type = *it;
+                if (++it == tokens.end())
+                    continue;
+                QByteArray name = *it;
+                bool singleElement = (tokens.size() == 3); // type, name and one value
+                char counter[10] = "000000000";
+                int counterPos = 8; // position of last digit
+                while (++it != tokens.end()) {
+                    m_parameterNames << name;
+                    if (!singleElement) {
+                        m_parameterNames.back() += "[";
+                        m_parameterNames.back() += counter + counterPos;
+                        m_parameterNames.back() += "]";
+                        int j = 8; // position of last digit
+                        ++counter[j];
+                        while (j > 0 && counter[j] > '9') {
+                            counter[j] = '0';
+                            ++counter[--j];
+                        }
+                        if (j < counterPos)
+                            counterPos = j;
+                    }
+
+                    if (type == "color") {
+                        layout->addWidget(new QLabel(m_parameterNames.back()));
+                        bool ok;
+                        ColorEdit *colorEdit = new ColorEdit(it->toUInt(&ok, 16), m_parameterNames.size() - 1);
+                        m_parameterEdits << colorEdit;
+                        layout->addWidget(colorEdit);
+                        connect(colorEdit, SIGNAL(colorChanged(QRgb,int)), this, SLOT(setColorParameter(QRgb,int)));
+                        ++row;
+                    } else if (type == "float") {
+                        layout->addWidget(new QLabel(m_parameterNames.back()));
+                        bool ok;
+                        FloatEdit *floatEdit = new FloatEdit(it->toFloat(&ok), m_parameterNames.size() - 1);
+                        m_parameterEdits << floatEdit;
+                        layout->addWidget(floatEdit);
+                        connect(floatEdit, SIGNAL(valueChanged(float,int)), this, SLOT(setFloatParameter(float,int)));
+                        ++row;
+                    }
+                }
+            }
+            file.close();
+        }
+    }
+
+    layout->addWidget(new QLabel(tr("Texture:")));
+    m_textureCombo = new QComboBox;
+    connect(m_textureCombo, SIGNAL(currentIndexChanged(int)), this, SIGNAL(textureChanged(int)));
+    layout->addWidget(m_textureCombo);
+    ++row;
+
+    layout->addWidget(new QLabel(tr("Shader:")));
+    m_shaderCombo = new QComboBox;
+    connect(m_shaderCombo, SIGNAL(currentIndexChanged(int)), this, SIGNAL(shaderChanged(int)));
+    layout->addWidget(m_shaderCombo);
+    ++row;
+
+    layout->setRowStretch(row, 1);
+}
+
+int RenderOptionsDialog::addTexture(const QString &name)
+{
+    m_textureCombo->addItem(name);
+    return m_textureCombo->count() - 1;
+}
+
+int RenderOptionsDialog::addShader(const QString &name)
+{
+    m_shaderCombo->addItem(name);
+    return m_shaderCombo->count() - 1;
+}
+
+void RenderOptionsDialog::emitParameterChanged()
+{
+    foreach (ParameterEdit *edit, m_parameterEdits)
+        edit->emitChange();
+}
+
+void RenderOptionsDialog::setColorParameter(QRgb color, int id)
+{
+    emit colorParameterChanged(m_parameterNames[id], color);
+}
+
+void RenderOptionsDialog::setFloatParameter(float value, int id)
+{
+    emit floatParameterChanged(m_parameterNames[id], value);
+}
+
+void RenderOptionsDialog::mouseDoubleClickEvent(QMouseEvent *event)
+{
+    if (event->button() == Qt::LeftButton)
+        emit doubleClicked();
+}
+
+//============================================================================//
+//                                 ItemDialog                                 //
+//============================================================================//
+
+ItemDialog::ItemDialog()
+    : QDialog(0, Qt::CustomizeWindowHint | Qt::WindowTitleHint)
+{
+    setWindowTitle(tr("Items (double click to flip)"));
+    setWindowOpacity(0.75);
+    resize(160, 100);
+
+    QVBoxLayout *layout = new QVBoxLayout;
+    setLayout(layout);
+    QPushButton *button;
+
+    button = new QPushButton(tr("Add Qt box"));
+    layout->addWidget(button);
+    connect(button, SIGNAL(clicked()), this, SLOT(triggerNewQtBox()));
+
+    button = new QPushButton(tr("Add circle"));
+    layout->addWidget(button);
+    connect(button, SIGNAL(clicked()), this, SLOT(triggerNewCircleItem()));
+
+    button = new QPushButton(tr("Add square"));
+    layout->addWidget(button);
+    connect(button, SIGNAL(clicked()), this, SLOT(triggerNewSquareItem()));
+
+    layout->addStretch(1);
+}
+
+void ItemDialog::triggerNewQtBox()
+{
+    emit newItemTriggered(QtBoxItem);
+}
+
+void ItemDialog::triggerNewCircleItem()
+{
+    emit newItemTriggered(CircleItem);
+}
+
+void ItemDialog::triggerNewSquareItem()
+{
+    emit newItemTriggered(SquareItem);
+}
+
+void ItemDialog::mouseDoubleClickEvent(QMouseEvent *event)
+{
+    if (event->button() == Qt::LeftButton)
+        emit doubleClicked();
+}
+
+//============================================================================//
+//                                    Scene                                   //
+//============================================================================//
+
+const static char environmentShaderText[] =
+    "uniform samplerCube env;"
+    "void main() {"
+        "gl_FragColor = textureCube(env, gl_TexCoord[1].xyz);"
+    "}";
+
+Scene::Scene(int width, int height, int maxTextureSize)
+    : m_distExp(600)
+    , m_frame(0)
+    , m_maxTextureSize(maxTextureSize)
+    , m_currentShader(0)
+    , m_currentTexture(0)
+    , m_dynamicCubemap(false)
+    , m_updateAllCubemaps(true)
+    , m_box(0)
+    , m_vertexShader(0)
+    , m_environmentShader(0)
+    , m_environmentProgram(0)
+{
+    setSceneRect(0, 0, width, height);
+
+    m_trackBalls[0] = TrackBall(0.05f, QVector3D(0, 1, 0), TrackBall::Sphere);
+    m_trackBalls[1] = TrackBall(0.005f, QVector3D(0, 0, 1), TrackBall::Sphere);
+    m_trackBalls[2] = TrackBall(0.0f, QVector3D(0, 1, 0), TrackBall::Plane);
+
+    m_renderOptions = new RenderOptionsDialog;
+    m_renderOptions->move(20, 120);
+    m_renderOptions->resize(m_renderOptions->sizeHint());
+
+    connect(m_renderOptions, SIGNAL(dynamicCubemapToggled(int)), this, SLOT(toggleDynamicCubemap(int)));
+    connect(m_renderOptions, SIGNAL(colorParameterChanged(QString,QRgb)), this, SLOT(setColorParameter(QString,QRgb)));
+    connect(m_renderOptions, SIGNAL(floatParameterChanged(QString,float)), this, SLOT(setFloatParameter(QString,float)));
+    connect(m_renderOptions, SIGNAL(textureChanged(int)), this, SLOT(setTexture(int)));
+    connect(m_renderOptions, SIGNAL(shaderChanged(int)), this, SLOT(setShader(int)));
+
+    m_itemDialog = new ItemDialog;
+    connect(m_itemDialog, SIGNAL(newItemTriggered(ItemDialog::ItemType)), this, SLOT(newItem(ItemDialog::ItemType)));
+
+    TwoSidedGraphicsWidget *twoSided = new TwoSidedGraphicsWidget(this);
+    twoSided->setWidget(0, m_renderOptions);
+    twoSided->setWidget(1, m_itemDialog);
+
+    connect(m_renderOptions, SIGNAL(doubleClicked()), twoSided, SLOT(flip()));
+    connect(m_itemDialog, SIGNAL(doubleClicked()), twoSided, SLOT(flip()));
+
+    addItem(new QtBox(64, width - 64, height - 64));
+    addItem(new QtBox(64, width - 64, 64));
+    addItem(new QtBox(64, 64, height - 64));
+    addItem(new QtBox(64, 64, 64));
+
+    initGL();
+
+    m_timer = new QTimer(this);
+    m_timer->setInterval(20);
+    connect(m_timer, SIGNAL(timeout()), this, SLOT(update()));
+    m_timer->start();
+
+    m_time.start();
+}
+
+Scene::~Scene()
+{
+    if (m_box)
+        delete m_box;
+    foreach (GLTexture *texture, m_textures)
+        if (texture) delete texture;
+    if (m_mainCubemap)
+        delete m_mainCubemap;
+    foreach (QGLShaderProgram *program, m_programs)
+        if (program) delete program;
+    if (m_vertexShader)
+        delete m_vertexShader;
+    foreach (QGLShader *shader, m_fragmentShaders)
+        if (shader) delete shader;
+    foreach (GLRenderTargetCube *rt, m_cubemaps)
+        if (rt) delete rt;
+    if (m_environmentShader)
+        delete m_environmentShader;
+    if (m_environmentProgram)
+        delete m_environmentProgram;
+}
+
+void Scene::initGL()
+{
+    m_box = new GLRoundedBox(0.25f, 1.0f, 10);
+
+    m_vertexShader = new QGLShader(QGLShader::Vertex);
+    m_vertexShader->compileSourceFile(QLatin1String(":/res/boxes/basic.vsh"));
+
+    QStringList list;
+    list << ":/res/boxes/cubemap_posx.jpg" << ":/res/boxes/cubemap_negx.jpg" << ":/res/boxes/cubemap_posy.jpg"
+         << ":/res/boxes/cubemap_negy.jpg" << ":/res/boxes/cubemap_posz.jpg" << ":/res/boxes/cubemap_negz.jpg";
+    m_environment = new GLTextureCube(list, qMin(1024, m_maxTextureSize));
+    m_environmentShader = new QGLShader(QGLShader::Fragment);
+    m_environmentShader->compileSourceCode(environmentShaderText);
+    m_environmentProgram = new QGLShaderProgram;
+    m_environmentProgram->addShader(m_vertexShader);
+    m_environmentProgram->addShader(m_environmentShader);
+    m_environmentProgram->link();
+
+    const int NOISE_SIZE = 128; // for a different size, B and BM in fbm.c must also be changed
+    m_noise = new GLTexture3D(NOISE_SIZE, NOISE_SIZE, NOISE_SIZE); 
+    QRgb *data = new QRgb[NOISE_SIZE * NOISE_SIZE * NOISE_SIZE];
+    memset(data, 0, NOISE_SIZE * NOISE_SIZE * NOISE_SIZE * sizeof(QRgb));
+    QRgb *p = data;
+    float pos[3];
+    for (int k = 0; k < NOISE_SIZE; ++k) {
+        pos[2] = k * (0x20 / (float)NOISE_SIZE);
+        for (int j = 0; j < NOISE_SIZE; ++j) {
+            for (int i = 0; i < NOISE_SIZE; ++i) {
+                for (int byte = 0; byte < 4; ++byte) {
+                    pos[0] = (i + (byte & 1) * 16) * (0x20 / (float)NOISE_SIZE);
+                    pos[1] = (j + (byte & 2) * 8) * (0x20 / (float)NOISE_SIZE);
+                    *p |= (int)(128.0f * (noise3(pos) + 1.0f)) << (byte * 8);
+                }
+                ++p;
+            }
+        }
+    }
+    m_noise->load(NOISE_SIZE, NOISE_SIZE, NOISE_SIZE, data);
+    delete[] data;
+
+    m_mainCubemap = new GLRenderTargetCube(512);
+
+    QStringList filter;
+    QList<QFileInfo> files;
+
+    // Load all .png files as textures
+    m_currentTexture = 0;
+    filter = QStringList("*.png");
+    files = QDir(":/res/boxes/").entryInfoList(filter, QDir::Files | QDir::Readable);
+
+    foreach (QFileInfo file, files) {
+        GLTexture *texture = new GLTexture2D(file.absoluteFilePath(), qMin(256, m_maxTextureSize), qMin(256, m_maxTextureSize));
+        if (texture->failed()) {
+            delete texture;
+            continue;
+        }
+        m_textures << texture;
+        m_renderOptions->addTexture(file.baseName());
+    }
+
+    if (m_textures.size() == 0)
+        m_textures << new GLTexture2D(qMin(64, m_maxTextureSize), qMin(64, m_maxTextureSize));
+
+    // Load all .fsh files as fragment shaders
+    m_currentShader = 0;
+    filter = QStringList("*.fsh");
+    files = QDir(":/res/boxes/").entryInfoList(filter, QDir::Files | QDir::Readable);
+    foreach (QFileInfo file, files) {
+        QGLShaderProgram *program = new QGLShaderProgram;
+        QGLShader* shader = new QGLShader(QGLShader::Fragment);
+        shader->compileSourceFile(file.absoluteFilePath());
+        // The program does not take ownership over the shaders, so store them in a vector so they can be deleted afterwards.
+        program->addShader(m_vertexShader);
+        program->addShader(shader);
+        if (!program->link()) {
+            qWarning("Failed to compile and link shader program");
+            qWarning("Vertex shader log:");
+            qWarning() << m_vertexShader->log();
+            qWarning() << "Fragment shader log ( file =" << file.absoluteFilePath() << "):";
+            qWarning() << shader->log();
+            qWarning("Shader program log:");
+            qWarning() << program->log();
+
+            delete shader;
+            delete program;
+            continue;
+        }
+
+        m_fragmentShaders << shader;
+        m_programs << program;
+        m_renderOptions->addShader(file.baseName());
+
+        program->bind();
+        m_cubemaps << ((program->uniformLocation("env") != -1) ? new GLRenderTargetCube(qMin(256, m_maxTextureSize)) : 0);
+        program->release();
+    }
+
+    if (m_programs.size() == 0)
+        m_programs << new QGLShaderProgram;
+
+    m_renderOptions->emitParameterChanged();
+}
+
+static void loadMatrix(const QMatrix4x4& m)
+{
+    // static to prevent glLoadMatrixf to fail on certain drivers
+    static GLfloat mat[16];
+    const qreal *data = m.constData();
+    for (int index = 0; index < 16; ++index)
+        mat[index] = data[index];
+    glLoadMatrixf(mat);
+}
+
+static void multMatrix(const QMatrix4x4& m)
+{
+    // static to prevent glMultMatrixf to fail on certain drivers
+    static GLfloat mat[16];
+    const qreal *data = m.constData();
+    for (int index = 0; index < 16; ++index)
+        mat[index] = data[index];
+    glMultMatrixf(mat);
+}
+
+// If one of the boxes should not be rendered, set excludeBox to its index.
+// If the main box should not be rendered, set excludeBox to -1.
+void Scene::renderBoxes(const QMatrix4x4 &view, int excludeBox)
+{
+    QMatrix4x4 invView = view.inverted();
+
+    // If multi-texturing is supported, use three saplers.
+    if (glActiveTexture) {
+        glActiveTexture(GL_TEXTURE0);
+        m_textures[m_currentTexture]->bind();
+        glActiveTexture(GL_TEXTURE2);
+        m_noise->bind();
+        glActiveTexture(GL_TEXTURE1);
+    } else {
+        m_textures[m_currentTexture]->bind();
+    }
+
+    glDisable(GL_LIGHTING);
+    glDisable(GL_CULL_FACE);
+
+    QMatrix4x4 viewRotation(view);
+    viewRotation(3, 0) = viewRotation(3, 1) = viewRotation(3, 2) = 0.0f;
+    viewRotation(0, 3) = viewRotation(1, 3) = viewRotation(2, 3) = 0.0f;
+    viewRotation(3, 3) = 1.0f;
+    loadMatrix(viewRotation);
+    glScalef(20.0f, 20.0f, 20.0f);
+
+    // Don't render the environment if the environment texture can't be set for the correct sampler.
+    if (glActiveTexture) {
+        m_environment->bind();
+        m_environmentProgram->bind();
+        m_environmentProgram->setUniformValue("tex", GLint(0));
+        m_environmentProgram->setUniformValue("env", GLint(1));
+        m_environmentProgram->setUniformValue("noise", GLint(2));
+        m_box->draw();
+        m_environmentProgram->release();
+        m_environment->unbind();
+    }
+
+    loadMatrix(view);
+
+    glEnable(GL_CULL_FACE);
+    glEnable(GL_LIGHTING);
+
+    for (int i = 0; i < m_programs.size(); ++i) {
+        if (i == excludeBox)
+            continue;
+
+        glPushMatrix();
+        QMatrix4x4 m;
+        m.rotate(m_trackBalls[1].rotation());
+        multMatrix(m);
+
+        glRotatef(360.0f * i / m_programs.size(), 0.0f, 0.0f, 1.0f);
+        glTranslatef(2.0f, 0.0f, 0.0f);
+        glScalef(0.3f, 0.6f, 0.6f);
+
+        if (glActiveTexture) {
+            if (m_dynamicCubemap && m_cubemaps[i])
+                m_cubemaps[i]->bind();
+            else
+                m_environment->bind();
+        }
+        m_programs[i]->bind();
+        m_programs[i]->setUniformValue("tex", GLint(0));
+        m_programs[i]->setUniformValue("env", GLint(1));
+        m_programs[i]->setUniformValue("noise", GLint(2));
+        m_programs[i]->setUniformValue("view", view);
+        m_programs[i]->setUniformValue("invView", invView);
+        m_box->draw();
+        m_programs[i]->release();
+
+        if (glActiveTexture) {
+            if (m_dynamicCubemap && m_cubemaps[i])
+                m_cubemaps[i]->unbind();
+            else
+                m_environment->unbind();
+        }
+        glPopMatrix();
+    }
+
+    if (-1 != excludeBox) {
+        QMatrix4x4 m;
+        m.rotate(m_trackBalls[0].rotation());
+        multMatrix(m);
+
+        if (glActiveTexture) {
+            if (m_dynamicCubemap)
+                m_mainCubemap->bind();
+            else
+                m_environment->bind();
+        }
+
+        m_programs[m_currentShader]->bind();
+        m_programs[m_currentShader]->setUniformValue("tex", GLint(0));
+        m_programs[m_currentShader]->setUniformValue("env", GLint(1));
+        m_programs[m_currentShader]->setUniformValue("noise", GLint(2));
+        m_programs[m_currentShader]->setUniformValue("view", view);
+        m_programs[m_currentShader]->setUniformValue("invView", invView);
+        m_box->draw();
+        m_programs[m_currentShader]->release();
+
+        if (glActiveTexture) {
+            if (m_dynamicCubemap)
+                m_mainCubemap->unbind();
+            else
+                m_environment->unbind();
+        }
+    }
+
+    if (glActiveTexture) {
+        glActiveTexture(GL_TEXTURE2);
+        m_noise->unbind();
+        glActiveTexture(GL_TEXTURE0);
+    }
+    m_textures[m_currentTexture]->unbind();
+}
+
+void Scene::setStates()
+{
+    //glClearColor(0.25f, 0.25f, 0.5f, 1.0f);
+
+    glEnable(GL_DEPTH_TEST);
+    glEnable(GL_CULL_FACE);
+    glEnable(GL_LIGHTING);
+    //glEnable(GL_COLOR_MATERIAL);
+    glEnable(GL_TEXTURE_2D);
+    glEnable(GL_NORMALIZE);
+
+    glMatrixMode(GL_PROJECTION);
+    glPushMatrix();
+    glLoadIdentity();
+
+    glMatrixMode(GL_MODELVIEW);
+    glPushMatrix();
+    glLoadIdentity();
+
+    setLights();
+
+    float materialSpecular[] = {0.5f, 0.5f, 0.5f, 1.0f};
+    glMaterialfv(GL_FRONT_AND_BACK, GL_SPECULAR, materialSpecular);
+    glMaterialf(GL_FRONT_AND_BACK, GL_SHININESS, 32.0f);
+}
+
+void Scene::setLights()
+{
+    glColorMaterial(GL_FRONT_AND_BACK, GL_AMBIENT_AND_DIFFUSE);
+    //float lightColour[] = {1.0f, 1.0f, 1.0f, 1.0f};
+    float lightDir[] = {0.0f, 0.0f, 1.0f, 0.0f};
+    //glLightfv(GL_LIGHT0, GL_DIFFUSE, lightColour);
+    //glLightfv(GL_LIGHT0, GL_SPECULAR, lightColour);
+    glLightfv(GL_LIGHT0, GL_POSITION, lightDir);
+    glLightModelf(GL_LIGHT_MODEL_LOCAL_VIEWER, 1.0f);
+    glEnable(GL_LIGHT0);
+}
+
+void Scene::defaultStates()
+{
+    //glClearColor(0.0f, 0.0f, 0.0f, 0.0f);
+
+    glDisable(GL_DEPTH_TEST);
+    glDisable(GL_CULL_FACE);
+    glDisable(GL_LIGHTING);
+    //glDisable(GL_COLOR_MATERIAL);
+    glDisable(GL_TEXTURE_2D);
+    glDisable(GL_LIGHT0);
+    glDisable(GL_NORMALIZE);
+
+    glMatrixMode(GL_MODELVIEW);
+    glPopMatrix();
+
+    glMatrixMode(GL_PROJECTION);
+    glPopMatrix();
+
+    glLightModelf(GL_LIGHT_MODEL_LOCAL_VIEWER, 0.0f);
+    float defaultMaterialSpecular[] = {0.0f, 0.0f, 0.0f, 1.0f};
+    glMaterialfv(GL_FRONT_AND_BACK, GL_SPECULAR, defaultMaterialSpecular);
+    glMaterialf(GL_FRONT_AND_BACK, GL_SHININESS, 0.0f);
+}
+
+void Scene::renderCubemaps()
+{
+    // To speed things up, only update the cubemaps for the small cubes every N frames.
+    const int N = (m_updateAllCubemaps ? 1 : 3);
+
+    QMatrix4x4 mat;
+    GLRenderTargetCube::getProjectionMatrix(mat, 0.1f, 100.0f);
+
+    glMatrixMode(GL_PROJECTION);
+    glPushMatrix();
+    loadMatrix(mat);
+
+    glMatrixMode(GL_MODELVIEW);
+    glPushMatrix();
+
+    QVector3D center;
+
+    for (int i = m_frame % N; i < m_cubemaps.size(); i += N) {
+        if (0 == m_cubemaps[i])
+            continue;
+
+        float angle = 2.0f * PI * i / m_cubemaps.size();
+
+        center = m_trackBalls[1].rotation().rotatedVector(QVector3D(cos(angle), sin(angle), 0.0f));
+
+        for (int face = 0; face < 6; ++face) {
+            m_cubemaps[i]->begin(face);
+
+            GLRenderTargetCube::getViewMatrix(mat, face);
+            QVector4D v = QVector4D(-center.x(), -center.y(), -center.z(), 1.0);
+            mat.setColumn(3, mat * v);
+
+            glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
+            renderBoxes(mat, i);
+
+            m_cubemaps[i]->end();
+        }
+    }
+
+    for (int face = 0; face < 6; ++face) {
+        m_mainCubemap->begin(face);
+        GLRenderTargetCube::getViewMatrix(mat, face);
+
+        glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
+        renderBoxes(mat, -1);
+
+        m_mainCubemap->end();
+    }
+
+    glPopMatrix();
+
+    glMatrixMode(GL_PROJECTION);
+    glPopMatrix();
+
+    m_updateAllCubemaps = false;
+}
+
+void Scene::drawBackground(QPainter *painter, const QRectF &)
+{
+    float width = float(painter->device()->width());
+    float height = float(painter->device()->height());
+
+    painter->beginNativePainting();
+    setStates();
+
+    if (m_dynamicCubemap)
+        renderCubemaps();
+
+    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
+
+    glMatrixMode(GL_PROJECTION);
+    qgluPerspective(60.0, width / height, 0.01, 15.0);
+
+    glMatrixMode(GL_MODELVIEW);
+
+    QMatrix4x4 view;
+    view.rotate(m_trackBalls[2].rotation());
+    view(2, 3) -= 2.0f * exp(m_distExp / 1200.0f);
+    renderBoxes(view);
+
+    defaultStates();
+    ++m_frame;
+
+    painter->endNativePainting();
+}
+
+QPointF Scene::pixelPosToViewPos(const QPointF& p)
+{
+    return QPointF(2.0 * float(p.x()) / width() - 1.0,
+                   1.0 - 2.0 * float(p.y()) / height());
+}
+
+void Scene::mouseMoveEvent(QGraphicsSceneMouseEvent *event)
+{
+    QGraphicsScene::mouseMoveEvent(event);
+    if (event->isAccepted())
+        return;
+
+    if (event->buttons() & Qt::LeftButton) {
+        m_trackBalls[0].move(pixelPosToViewPos(event->scenePos()), m_trackBalls[2].rotation().conjugate());
+        event->accept();
+    } else {
+        m_trackBalls[0].release(pixelPosToViewPos(event->scenePos()), m_trackBalls[2].rotation().conjugate());
+    }
+
+    if (event->buttons() & Qt::RightButton) {
+        m_trackBalls[1].move(pixelPosToViewPos(event->scenePos()), m_trackBalls[2].rotation().conjugate());
+        event->accept();
+    } else {
+        m_trackBalls[1].release(pixelPosToViewPos(event->scenePos()), m_trackBalls[2].rotation().conjugate());
+    }
+
+    if (event->buttons() & Qt::MidButton) {
+        m_trackBalls[2].move(pixelPosToViewPos(event->scenePos()), QQuaternion());
+        event->accept();
+    } else {
+        m_trackBalls[2].release(pixelPosToViewPos(event->scenePos()), QQuaternion());
+    }
+}
+
+void Scene::mousePressEvent(QGraphicsSceneMouseEvent *event)
+{
+    QGraphicsScene::mousePressEvent(event);
+    if (event->isAccepted())
+        return;
+
+    if (event->buttons() & Qt::LeftButton) {
+        m_trackBalls[0].push(pixelPosToViewPos(event->scenePos()), m_trackBalls[2].rotation().conjugate());
+        event->accept();
+    }
+
+    if (event->buttons() & Qt::RightButton) {
+        m_trackBalls[1].push(pixelPosToViewPos(event->scenePos()), m_trackBalls[2].rotation().conjugate());
+        event->accept();
+    }
+
+    if (event->buttons() & Qt::MidButton) {
+        m_trackBalls[2].push(pixelPosToViewPos(event->scenePos()), QQuaternion());
+        event->accept();
+    }
+}
+
+void Scene::mouseReleaseEvent(QGraphicsSceneMouseEvent *event)
+{
+    QGraphicsScene::mouseReleaseEvent(event);
+    if (event->isAccepted())
+        return;
+
+    if (event->button() == Qt::LeftButton) {
+        m_trackBalls[0].release(pixelPosToViewPos(event->scenePos()), m_trackBalls[2].rotation().conjugate());
+        event->accept();
+    }
+
+    if (event->button() == Qt::RightButton) {
+        m_trackBalls[1].release(pixelPosToViewPos(event->scenePos()), m_trackBalls[2].rotation().conjugate());
+        event->accept();
+    }
+
+    if (event->button() == Qt::MidButton) {
+        m_trackBalls[2].release(pixelPosToViewPos(event->scenePos()), QQuaternion());
+        event->accept();
+    }
+}
+
+void Scene::wheelEvent(QGraphicsSceneWheelEvent * event)
+{
+    QGraphicsScene::wheelEvent(event);
+    if (!event->isAccepted()) {
+        m_distExp += event->delta();
+        if (m_distExp < -8 * 120)
+            m_distExp = -8 * 120;
+        if (m_distExp > 10 * 120)
+            m_distExp = 10 * 120;
+        event->accept();
+    }
+}
+
+void Scene::setShader(int index)
+{
+    if (index >= 0 && index < m_fragmentShaders.size())
+        m_currentShader = index;
+}
+
+void Scene::setTexture(int index)
+{
+    if (index >= 0 && index < m_textures.size())
+        m_currentTexture = index;
+}
+
+void Scene::toggleDynamicCubemap(int state)
+{
+    if ((m_dynamicCubemap = (state == Qt::Checked)))
+        m_updateAllCubemaps = true;
+}
+
+void Scene::setColorParameter(const QString &name, QRgb color)
+{
+    // set the color in all programs
+    foreach (QGLShaderProgram *program, m_programs) {
+        program->bind();
+        program->setUniformValue(program->uniformLocation(name), QColor(color));
+        program->release();
+    }
+}
+
+void Scene::setFloatParameter(const QString &name, float value)
+{
+    // set the color in all programs
+    foreach (QGLShaderProgram *program, m_programs) {
+        program->bind();
+        program->setUniformValue(program->uniformLocation(name), value);
+        program->release();
+    }
+}
+
+void Scene::newItem(ItemDialog::ItemType type)
+{
+    QSize size = sceneRect().size().toSize();
+    switch (type) {
+    case ItemDialog::QtBoxItem:
+        addItem(new QtBox(64, rand() % (size.width() - 64) + 32, rand() % (size.height() - 64) + 32));
+        break;
+    case ItemDialog::CircleItem:
+        addItem(new CircleItem(64, rand() % (size.width() - 64) + 32, rand() % (size.height() - 64) + 32));
+        break;
+    case ItemDialog::SquareItem:
+        addItem(new SquareItem(64, rand() % (size.width() - 64) + 32, rand() % (size.height() - 64) + 32));
+        break;
+    default:
+        break;
+    }
+}