/****************************************************************************+
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**+
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** Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies).+
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** All rights reserved.+
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** Contact: Nokia Corporation (qt-info@nokia.com)+
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**+
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** This file is part of the examples of the Qt Toolkit.+
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**+
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** $QT_BEGIN_LICENSE:LGPL$+
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** No Commercial Usage+
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** This file contains pre-release code and may not be distributed.+
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** You may use this file in accordance with the terms and conditions+
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** contained in the Technology Preview License Agreement accompanying+
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** this package.+
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**+
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** GNU Lesser General Public License Usage+
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** Alternatively, this file may be used under the terms of the GNU Lesser+
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** General Public License version 2.1 as published by the Free Software+
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** Foundation and appearing in the file LICENSE.LGPL included in the+
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** packaging of this file.  Please review the following information to+
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** ensure the GNU Lesser General Public License version 2.1 requirements+
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** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.+
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**+
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** In addition, as a special exception, Nokia gives you certain additional+
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** rights.  These rights are described in the Nokia Qt LGPL Exception+
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** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.+
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**+
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** If you have questions regarding the use of this file, please contact+
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** Nokia at qt-info@nokia.com.+
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**+
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**+
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**+
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**+
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**+
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**+
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**+
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**+
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** $QT_END_LICENSE$+
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**+
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****************************************************************************/+
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+
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#include "glwidget.h"+
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#include <math.h>+
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+
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#include "cube.h"+
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+
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#include <QGLPixelBuffer>+
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+
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#ifndef GL_MULTISAMPLE+
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#define GL_MULTISAMPLE  0x809D+
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#endif+
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+
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static GLfloat colorArray[][4] = {+
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    {0.243f, 0.423f, 0.125f, 1.0f},+
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    {0.176f, 0.31f, 0.09f, 1.0f},+
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    {0.4f, 0.69f, 0.212f, 1.0f},+
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    {0.317f, 0.553f, 0.161f, 1.0f}+
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};+
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+
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GLWidget::GLWidget(QWidget *parent)+
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    : QGLWidget(QGLFormat(QGL::SampleBuffers), parent)+
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    , geom(0)+
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    , cube(0)+
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{+
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    // create the pbuffer+
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    pbuffer = new QGLPixelBuffer(QSize(512, 512), format(), this);+
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    setWindowTitle(tr("OpenGL pbuffers"));+
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    initializeGeometry();+
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}+
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+
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GLWidget::~GLWidget()+
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{+
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    pbuffer->releaseFromDynamicTexture();+
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    glDeleteTextures(1, &dynamicTexture);+
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    delete pbuffer;+
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+
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    qDeleteAll(cubes);+
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    qDeleteAll(tiles);+
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    delete cube;+
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}+
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+
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void GLWidget::initializeGL()+
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{+
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    initCommon();+
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    glShadeModel(GL_SMOOTH);+
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    glEnable(GL_LIGHTING);+
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    glEnable(GL_LIGHT0);+
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    static GLfloat lightPosition[4] = { 0.5, 5.0, 7.0, 1.0 };+
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    glLightfv(GL_LIGHT0, GL_POSITION, lightPosition);+
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    initPbuffer();+
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    cube->startAnimation();+
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    connect(cube, SIGNAL(changed()), this, SLOT(update()));+
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    for (int i = 0; i < 3; ++i)+
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    {+
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        cubes[i]->startAnimation();+
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        connect(cubes[i], SIGNAL(changed()), this, SLOT(update()));+
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    }+
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}+
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+
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void GLWidget::paintGL()+
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{+
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    pbuffer->makeCurrent();+
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    drawPbuffer();+
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    // On direct render platforms, drawing onto the pbuffer context above+
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    // automatically updates the dynamic texture.  For cases where rendering+
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    // directly to a texture is not supported, explicitly copy.+
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    if (!hasDynamicTextureUpdate)+
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        pbuffer->updateDynamicTexture(dynamicTexture);+
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    makeCurrent();+
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+
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    // Use the pbuffer as a texture to render the scene+
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    glBindTexture(GL_TEXTURE_2D, dynamicTexture);+
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+
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    // set up to render the scene+
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    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);+
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    glLoadIdentity();+
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    glTranslatef(0.0f, 0.0f, -10.0f);+
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+
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    // draw the background+
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    glPushMatrix();+
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    glScalef(aspect, 1.0f, 1.0f);+
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    for (int i = 0; i < tiles.count(); ++i)+
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        tiles[i]->draw();+
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    glPopMatrix();+
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+
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    // draw the bouncing cubes+
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    for (int i = 0; i < cubes.count(); ++i)+
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        cubes[i]->draw();+
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}+
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+
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void GLWidget::initializeGeometry()+
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{+
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    geom = new Geometry();+
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    CubeBuilder cBuilder(geom, 0.5);+
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    cBuilder.setColor(QColor(255, 255, 255, 212));+
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    // build the 3 bouncing, spinning cubes+
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    for (int i = 0; i < 3; ++i)+
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        cubes.append(cBuilder.newCube(QVector3D((float)(i-1), -1.5f, 5 - i)));+
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+
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    // build the spinning cube which goes in the dynamic texture+
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    cube = cBuilder.newCube();+
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    cube->removeBounce();+
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+
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    // build the background tiles+
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    TileBuilder tBuilder(geom);+
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    tBuilder.setColor(QColor(Qt::white));+
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    for (int c = -2; c <= +2; ++c)+
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        for (int r = -2; r <= +2; ++r)+
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            tiles.append(tBuilder.newTile(QVector3D(c, r, 0)));+
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+
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    // graded backdrop for the pbuffer scene+
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    TileBuilder bBuilder(geom, 0.0f, 2.0f);+
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    bBuilder.setColor(QColor(102, 176, 54, 210));+
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    backdrop = bBuilder.newTile(QVector3D(0.0f, 0.0f, -1.5f));+
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    backdrop->setColors(colorArray);+
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}+
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+
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void GLWidget::initCommon()+
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{+
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    qglClearColor(QColor(Qt::darkGray));+
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+
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    glEnable(GL_DEPTH_TEST);+
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    glEnable(GL_CULL_FACE);+
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    glEnable(GL_MULTISAMPLE);+
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+
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    glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);+
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    glEnable(GL_BLEND);+
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+
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    glEnable(GL_TEXTURE_2D);+
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+
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    geom->loadArrays();+
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}+
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+
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void GLWidget::perspectiveProjection()+
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{+
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    glMatrixMode(GL_PROJECTION);+
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    glLoadIdentity();+
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#ifdef QT_OPENGL_ES+
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    glFrustumf(-aspect, +aspect, -1.0, +1.0, 4.0, 15.0);+
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#else+
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    glFrustum(-aspect, +aspect, -1.0, +1.0, 4.0, 15.0);+
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#endif+
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    glMatrixMode(GL_MODELVIEW);+
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}+
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+
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void GLWidget::orthographicProjection()+
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{+
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    glMatrixMode(GL_PROJECTION);+
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    glLoadIdentity();+
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#ifdef QT_OPENGL_ES+
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    glOrthof(-1.0, +1.0, -1.0, +1.0, -90.0, +90.0);+
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#else+
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    glOrtho(-1.0, +1.0, -1.0, +1.0, -90.0, +90.0);+
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#endif+
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    glMatrixMode(GL_MODELVIEW);+
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}+
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+
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void GLWidget::resizeGL(int width, int height)+
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{+
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    glViewport(0, 0, width, height);+
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    aspect = (qreal)width / (qreal)(height ? height : 1);+
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    perspectiveProjection();+
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}+
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+
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void GLWidget::drawPbuffer()+
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{+
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    orthographicProjection();+
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+
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    glClearColor(0.0f, 0.0f, 0.0f, 1.0f);+
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    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);+
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+
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    glDisable(GL_TEXTURE_2D);+
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    backdrop->draw();+
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    glEnable(GL_TEXTURE_2D);+
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+
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    glBindTexture(GL_TEXTURE_2D, cubeTexture);+
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    glDisable(GL_CULL_FACE);+
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    cube->draw();+
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    glEnable(GL_CULL_FACE);+
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+
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    glFlush();+
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}+
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+
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void GLWidget::initPbuffer()+
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{+
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    pbuffer->makeCurrent();+
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+
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    cubeTexture = bindTexture(QImage(":res/cubelogo.png"));+
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+
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    initCommon();+
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+
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    // generate a texture that has the same size/format as the pbuffer+
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    dynamicTexture = pbuffer->generateDynamicTexture();+
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+
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    // bind the dynamic texture to the pbuffer - this is a no-op under X11+
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    hasDynamicTextureUpdate = pbuffer->bindToDynamicTexture(dynamicTexture);+
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    makeCurrent();+
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}+
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+
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void GLWidget::setAnimationPaused(bool enable)+
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{+
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    cube->setAnimationPaused(enable);+
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    for (int i = 0; i < 3; ++i)+
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        cubes[i]->setAnimationPaused(enable);+
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}+
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