qt5base-lts/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[] = { 3.8f, 4.4f, 5.6f };
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],
                                      colorArray[i][3]);
}

Tile::Tile(const QVector3D &loc)
    : location(loc)
    , start(0)
    , count(0)
    , useFlatColor(false)
    , geom(0)
{
    qSetColor(faceColor, QColor(Qt::darkGray));
}

void Tile::setColors(GLfloat colorArray[4][4])
{
    useFlatColor = true;
    geom->setColors(start, colorArray);
}

static inline void qMultMatrix(const QMatrix4x4 &mat)
{
    if (sizeof(qreal) == sizeof(GLfloat))
        glMultMatrixf((GLfloat*)mat.constData());
#ifndef QT_OPENGL_ES
    else if (sizeof(qreal) == sizeof(GLdouble))
        glMultMatrixd((GLdouble*)mat.constData());
#endif
    else
    {
        GLfloat fmat[16];
        qreal const *r = mat.constData();
        for (int i = 0; i < 16; ++i)
            fmat[i] = r[i];
        glMultMatrixf(fmat);
    }
}

void Tile::draw() const
{
    QMatrix4x4 mat;
    mat.translate(location);
    mat.rotate(orientation);
    glMatrixMode(GL_MODELVIEW);
    glPushMatrix();
    qMultMatrix(mat);
    glMaterialfv(GL_FRONT_AND_BACK, GL_AMBIENT_AND_DIFFUSE, faceColor);
    glDrawElements(GL_TRIANGLES, count, GL_UNSIGNED_SHORT, geom->indices() + start);
    glPopMatrix();
}

TileBuilder::TileBuilder(Geometry *g, qreal depth, qreal size)
    : verts(4)
    , tex(4)
    , start(g->count())
    , count(0)
    , geom(g)
{
    // front face - make a square with bottom-left at origin
    verts[br].setX(size);
    verts[tr].setX(size);
    verts[tr].setY(size);
    verts[tl].setY(size);

    // these vert numbers are good for the tex-coords
    for (int i = 0; i < 4; ++i)
        tex[i] = verts[i].toVector2D();

    // now move verts half cube width across so cube is centered on origin
    for (int i = 0; i < 4; ++i)
        verts[i] -= QVector3D(size / 2.0f, size / 2.0f, -depth);

    // add the front face
    g->addQuad(verts[bl], verts[br], verts[tr], verts[tl], tex);

    count = g->count() - start;
}

void TileBuilder::initialize(Tile *tile) const
{
    tile->start = start;
    tile->count = count;
    tile->geom = geom;
    qSetColor(tile->faceColor, color);
}

Tile *TileBuilder::newTile(const QVector3D &loc) const
{
    Tile *tile = new Tile(loc);
    initialize(tile);
    return tile;
}

Cube::Cube(const QVector3D &loc)
    : Tile(loc)
    , rot(0.0f)
    , r(0)
    , animGroup(0)
{
}

Cube::~Cube()
{
}

void Cube::setAltitude(qreal a)
{
    if (location.y() != a)
    {
        location.setY(a);
        emit changed();
    }
}

void Cube::setRange(qreal r)
{
    if (location.x() != r)
    {
        location.setX(r);
        emit changed();
    }
}

void Cube::setRotation(qreal r)
{
    if (r != rot)
    {
        orientation = QQuaternion::fromAxisAndAngle(QVector3D(1.0f, 1.0f, 1.0f), r);
        emit changed();
    }
}

void Cube::removeBounce()
{
    delete animGroup;
    animGroup = 0;
    delete r;
    r = 0;
}

void Cube::startAnimation()
{
    if (r)
    {
        r->start();
        r->setCurrentTime(startx);
    }
    if (animGroup)
        animGroup->start();
    if (rtn)
        rtn->start();
}

void Cube::setAnimationPaused(bool paused)
{
    if (paused)
    {
        if (r)
            r->pause();
        if (animGroup)
            animGroup->pause();
        if (rtn)
            rtn->pause();
    }
    else
    {
        if (r)
            r->resume();
        if (animGroup)
            animGroup->resume();
        if (rtn)
            rtn->resume();
    }
}

CubeBuilder::CubeBuilder(Geometry *g, qreal depth, qreal size)
    : TileBuilder(g, depth)
    , ix(0)
{
    for (int i = 0; i < 4; ++i)
        verts[i].setZ(size / 2.0f);
    // back face - "extrude" verts down
    QVector<QVector3D> back(verts);
    for (int i = 0; i < 4; ++i)
        back[i].setZ(-size / 2.0f);

    // add the back face
    g->addQuad(back[br], back[bl], back[tl], back[tr], tex);

    // add the sides
    g->addQuad(back[bl], back[br], verts[br], verts[bl], tex);
    g->addQuad(back[br], back[tr], verts[tr], verts[br], tex);
    g->addQuad(back[tr], back[tl], verts[tl], verts[tr], tex);
    g->addQuad(back[tl], back[bl], verts[bl], verts[tl], tex);

    count = g->count() - start;
}

Cube *CubeBuilder::newCube(const QVector3D &loc) const
{
    Cube *c = new Cube(loc);
    initialize(c);
    qreal d = 4000.0f;
    qreal d3 = d / 3.0f;
    // Animate movement from left to right
    c->r = new QPropertyAnimation(c, "range");
    c->r->setStartValue(-1.3f);
    c->r->setEndValue(1.3f);
    c->startx = ix * d3 * 3.0f;
    c->r->setDuration(d * 4.0f);
    c->r->setLoopCount(-1);
    c->r->setEasingCurve(QEasingCurve(QEasingCurve::CosineCurve));

    c->animGroup = new QSequentialAnimationGroup(c);

    // Animate movement from bottom to top
    QPropertyAnimation *a_up = new QPropertyAnimation(c, "altitude", c->animGroup);
    a_up->setEndValue(loc.y());
    a_up->setStartValue(loc.y() + amplitudes[ix]);
    a_up->setDuration(d / speeds[ix]);
    a_up->setLoopCount(1);
    a_up->setEasingCurve(QEasingCurve(QEasingCurve::InQuad));

    // Animate movement from top to bottom
    QPropertyAnimation *a_down = new QPropertyAnimation(c, "altitude", c->animGroup);
    a_down->setEndValue(loc.y() + amplitudes[ix]);
    a_down->setStartValue(loc.y());
    a_down->setDuration(d / speeds[ix]);
    a_down->setLoopCount(1);
    a_down->setEasingCurve(QEasingCurve(QEasingCurve::OutQuad));

    c->animGroup->addAnimation(a_up);
    c->animGroup->addAnimation(a_down);
    c->animGroup->setLoopCount(-1);

    // Animate rotation
    c->rtn = new QPropertyAnimation(c, "rotation");
    c->rtn->setStartValue(c->rot);
    c->rtn->setEndValue(359.0f);
    c->rtn->setDuration(d * 2.0f);
    c->rtn->setLoopCount(-1);
    c->rtn->setDuration(d / 2);
    ix = (ix + 1) % 3;
    return c;
}