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qt4-doc-4.6.3-0.2mdv2010.2.i586.rpm

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<pre><span class="comment"> /****************************************************************************
 **
 ** Copyright (C) 2010 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.
 **
 ** $QT_BEGIN_LICENSE:LGPL$
 ** Commercial Usage
 ** Licensees holding valid Qt Commercial licenses may use this file in
 ** accordance with the Qt Commercial License Agreement provided with the
 ** Software or, alternatively, in accordance with the terms contained in
 ** a written agreement between you and Nokia.
 **
 ** 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.
 **
 ** GNU General Public License Usage
 ** Alternatively, this file may be used under the terms of the GNU
 ** General Public License version 3.0 as published by the Free Software
 ** Foundation and appearing in the file LICENSE.GPL included in the
 ** packaging of this file.  Please review the following information to
 ** ensure the GNU General Public License version 3.0 requirements will be
 ** met: http://www.gnu.org/copyleft/gpl.html.
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 #include &lt;QtGui&gt;
 #include &lt;QtOpenGL&gt;

 #include &quot;glwidget.h&quot;

 GLWidget::GLWidget(QWidget *parent, QGLWidget *shareWidget)
     : QGLWidget(parent, shareWidget)
 {
     clearColor = Qt::black;
     xRot = 0;
     yRot = 0;
     zRot = 0;
 #ifdef QT_OPENGL_ES_2
     program = 0;
 #endif
 }

 GLWidget::~GLWidget()
 {
 }

 QSize GLWidget::minimumSizeHint() const
 {
     return QSize(50, 50);
 }

 QSize GLWidget::sizeHint() const
 {
     return QSize(200, 200);
 }

 void GLWidget::rotateBy(int xAngle, int yAngle, int zAngle)
 {
     xRot += xAngle;
     yRot += yAngle;
     zRot += zAngle;
     updateGL();
 }

 void GLWidget::setClearColor(const QColor &amp;color)
 {
     clearColor = color;
     updateGL();
 }

 void GLWidget::initializeGL()
 {
     makeObject();

     glEnable(GL_DEPTH_TEST);
     glEnable(GL_CULL_FACE);
 #ifndef QT_OPENGL_ES_2
     glEnable(GL_TEXTURE_2D);
 #endif

 #ifdef QT_OPENGL_ES_2

 #define PROGRAM_VERTEX_ATTRIBUTE 0
 #define PROGRAM_TEXCOORD_ATTRIBUTE 1

     QGLShader *vshader = new QGLShader(QGLShader::Vertex, this);
     const char *vsrc =
         &quot;attribute highp vec4 vertex;\n&quot;
         &quot;attribute mediump vec4 texCoord;\n&quot;
         &quot;varying mediump vec4 texc;\n&quot;
         &quot;uniform mediump mat4 matrix;\n&quot;
         &quot;void main(void)\n&quot;
         &quot;{\n&quot;
         &quot;    gl_Position = matrix * vertex;\n&quot;
         &quot;    texc = texCoord;\n&quot;
         &quot;}\n&quot;;
     vshader-&gt;compileSourceCode(vsrc);

     QGLShader *fshader = new QGLShader(QGLShader::Fragment, this);
     const char *fsrc =
         &quot;uniform sampler2D texture;\n&quot;
         &quot;varying mediump vec4 texc;\n&quot;
         &quot;void main(void)\n&quot;
         &quot;{\n&quot;
         &quot;    gl_FragColor = texture2D(texture, texc.st);\n&quot;
         &quot;}\n&quot;;
     fshader-&gt;compileSourceCode(fsrc);

     program = new QGLShaderProgram(this);
     program-&gt;addShader(vshader);
     program-&gt;addShader(fshader);
     program-&gt;bindAttributeLocation(&quot;vertex&quot;, PROGRAM_VERTEX_ATTRIBUTE);
     program-&gt;bindAttributeLocation(&quot;texCoord&quot;, PROGRAM_TEXCOORD_ATTRIBUTE);
     program-&gt;link();

     program-&gt;bind();
     program-&gt;setUniformValue(&quot;texture&quot;, 0);

 #endif
 }

 void GLWidget::paintGL()
 {
     qglClearColor(clearColor);
     glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);

 #if !defined(QT_OPENGL_ES_2)

     glLoadIdentity();
     glTranslatef(0.0f, 0.0f, -10.0f);
     glRotatef(xRot / 16.0f, 1.0f, 0.0f, 0.0f);
     glRotatef(yRot / 16.0f, 0.0f, 1.0f, 0.0f);
     glRotatef(zRot / 16.0f, 0.0f, 0.0f, 1.0f);

     glVertexPointer(3, GL_FLOAT, 0, vertices.constData());
     glTexCoordPointer(2, GL_FLOAT, 0, texCoords.constData());
     glEnableClientState(GL_VERTEX_ARRAY);
     glEnableClientState(GL_TEXTURE_COORD_ARRAY);

 #else

     QMatrix4x4 m;
     m.ortho(-0.5f, +0.5f, +0.5f, -0.5f, 4.0f, 15.0f);
     m.translate(0.0f, 0.0f, -10.0f);
     m.rotate(xRot / 16.0f, 1.0f, 0.0f, 0.0f);
     m.rotate(yRot / 16.0f, 0.0f, 1.0f, 0.0f);
     m.rotate(zRot / 16.0f, 0.0f, 0.0f, 1.0f);

     program-&gt;setUniformValue(&quot;matrix&quot;, m);
     program-&gt;enableAttributeArray(PROGRAM_VERTEX_ATTRIBUTE);
     program-&gt;enableAttributeArray(PROGRAM_TEXCOORD_ATTRIBUTE);
     program-&gt;setAttributeArray
         (PROGRAM_VERTEX_ATTRIBUTE, vertices.constData());
     program-&gt;setAttributeArray
         (PROGRAM_TEXCOORD_ATTRIBUTE, texCoords.constData());

 #endif

     for (int i = 0; i &lt; 6; ++i) {
         glBindTexture(GL_TEXTURE_2D, textures[i]);
         glDrawArrays(GL_TRIANGLE_FAN, i * 4, 4);
     }
 }

 void GLWidget::resizeGL(int width, int height)
 {
     int side = qMin(width, height);
     glViewport((width - side) / 2, (height - side) / 2, side, side);

 #if !defined(QT_OPENGL_ES_2)
     glMatrixMode(GL_PROJECTION);
     glLoadIdentity();
 #ifndef QT_OPENGL_ES
     glOrtho(-0.5, +0.5, +0.5, -0.5, 4.0, 15.0);
 #else
     glOrthof(-0.5, +0.5, +0.5, -0.5, 4.0, 15.0);
 #endif
     glMatrixMode(GL_MODELVIEW);
 #endif
 }

 void GLWidget::mousePressEvent(QMouseEvent *event)
 {
     lastPos = event-&gt;pos();
 }

 void GLWidget::mouseMoveEvent(QMouseEvent *event)
 {
     int dx = event-&gt;x() - lastPos.x();
     int dy = event-&gt;y() - lastPos.y();

     if (event-&gt;buttons() &amp; Qt::LeftButton) {
         rotateBy(8 * dy, 8 * dx, 0);
     } else if (event-&gt;buttons() &amp; Qt::RightButton) {
         rotateBy(8 * dy, 0, 8 * dx);
     }
     lastPos = event-&gt;pos();
 }

 void GLWidget::mouseReleaseEvent(QMouseEvent * <span class="comment">/* event */</span>)
 {
     emit clicked();
 }

 void GLWidget::makeObject()
 {
     static const int coords[6][4][3] = {
         { { +1, -1, -1 }, { -1, -1, -1 }, { -1, +1, -1 }, { +1, +1, -1 } },
         { { +1, +1, -1 }, { -1, +1, -1 }, { -1, +1, +1 }, { +1, +1, +1 } },
         { { +1, -1, +1 }, { +1, -1, -1 }, { +1, +1, -1 }, { +1, +1, +1 } },
         { { -1, -1, -1 }, { -1, -1, +1 }, { -1, +1, +1 }, { -1, +1, -1 } },
         { { +1, -1, +1 }, { -1, -1, +1 }, { -1, -1, -1 }, { +1, -1, -1 } },
         { { -1, -1, +1 }, { +1, -1, +1 }, { +1, +1, +1 }, { -1, +1, +1 } }
     };

     for (int j=0; j &lt; 6; ++j) {
         textures[j] = bindTexture
             (QPixmap(QString(&quot;:/images/side%1.png&quot;).arg(j + 1)), GL_TEXTURE_2D);
     }

     for (int i = 0; i &lt; 6; ++i) {
         for (int j = 0; j &lt; 4; ++j) {
             texCoords.append
                 (QVector2D(j == 0 || j == 3, j == 0 || j == 1));
             vertices.append
                 (QVector3D(0.2 * coords[i][j][0], 0.2 * coords[i][j][1],
                            0.2 * coords[i][j][2]));
         }
     }
 }</pre>
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