source: trunk/examples/opengl/pbuffers/cube.cpp

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#include "cube.h"
#include "glwidget.h"

#include <QtGui/QImage>
#include <QtCore/QPropertyAnimation>

static const qreal FACE_SIZE = 0.4;

static const qreal speeds[] = { 1.8f, 2.4f, 3.6f };
static const qreal amplitudes[] = { 2.0f, 2.5f, 3.0f };

static inline void qSetColor(float colorVec[], QColor c)
{
    colorVec[0] = c.redF();
    colorVec[1] = c.greenF();
    colorVec[2] = c.blueF();
    colorVec[3] = c.alphaF();
}

int Geometry::append(const QVector3D &a, const QVector3D &n, const QVector2D &t)
{
    int v = vertices.count();
    vertices.append(a);
    normals.append(n);
    texCoords.append(t);
    faces.append(v);
    colors.append(QVector4D(0.6f, 0.6f, 0.6f, 1.0f));
    return v;
}

void Geometry::addQuad(const QVector3D &a, const QVector3D &b,
                           const QVector3D &c, const QVector3D &d,
                           const QVector<QVector2D> &tex)
{
    QVector3D norm = QVector3D::normal(a, b, c);
    // append first triangle
    int aref = append(a, norm, tex[0]);
    append(b, norm, tex[1]);
    int cref = append(c, norm, tex[2]);
    // append second triangle
    faces.append(aref);
    faces.append(cref);
    append(d, norm, tex[3]);
}

void Geometry::loadArrays() const
{
    glEnableClientState(GL_VERTEX_ARRAY);
    glEnableClientState(GL_NORMAL_ARRAY);
    glEnableClientState(GL_TEXTURE_COORD_ARRAY);
    glEnableClientState(GL_COLOR_ARRAY);
    glVertexPointer(3, GL_FLOAT, 0, vertices.constData());
    glNormalPointer(GL_FLOAT, 0, normals.constData());
    glTexCoordPointer(2, GL_FLOAT, 0, texCoords.constData());
    glColorPointer(4, GL_FLOAT, 0, colors.constData());
}

void Geometry::setColors(int start, GLfloat colorArray[4][4])
{
    int off = faces[start];
    for (int i = 0; i < 4; ++i)
        colors[i + off] = QVector4D(colorArray[i][0],
                                      colorArray[i][1],
                                      colorArray[i][2],