/****************************************************************************

**

** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).

** All rights reserved.

** Contact: Nokia Corporation (qt-info@nokia.com)

**

** This file is part of the examples 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 "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],

                                      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), a(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 a;

    a = 0;

    delete r;

    r = 0;

}

void Cube::startAnimation()

{

    if (r)

    {

        r->start();

        r->setCurrentTime(startx);

    }

    if (a)

        a->start();

    if (rtn)

        rtn->start();

}

void Cube::setAnimationPaused(bool paused)

{

    if (paused)

    {

        if (r)

            r->pause();

        if (a)

            a->pause();

        if (rtn)

            rtn->pause();

    }

    else

    {

        if (r)

            r->resume();

        if (a)

            a->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));

    // Animate movement from bottom to top

    c->a = new QPropertyAnimation(c, "altitude");

    c->a->setEndValue(loc.y());

    c->a->setStartValue(loc.y() + amplitudes[ix]);

    c->a->setDuration(d / speeds[ix]);

    c->a->setLoopCount(-1);

    c->a->setEasingCurve(QEasingCurve(QEasingCurve::CosineCurve));

    // 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;

}