1 | /****************************************************************************
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2 | **
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3 | ** Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies).
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4 | ** All rights reserved.
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5 | ** Contact: Nokia Corporation (qt-info@nokia.com)
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6 | **
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7 | ** This file is part of the examples of the Qt Toolkit.
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8 | **
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9 | ** $QT_BEGIN_LICENSE:LGPL$
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10 | ** Commercial Usage
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11 | ** Licensees holding valid Qt Commercial licenses may use this file in
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12 | ** accordance with the Qt Commercial License Agreement provided with the
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13 | ** Software or, alternatively, in accordance with the terms contained in
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14 | ** a written agreement between you and Nokia.
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15 | **
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16 | ** GNU Lesser General Public License Usage
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17 | ** Alternatively, this file may be used under the terms of the GNU Lesser
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18 | ** General Public License version 2.1 as published by the Free Software
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19 | ** Foundation and appearing in the file LICENSE.LGPL included in the
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20 | ** packaging of this file. Please review the following information to
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21 | ** ensure the GNU Lesser General Public License version 2.1 requirements
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22 | ** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
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23 | **
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24 | ** In addition, as a special exception, Nokia gives you certain additional
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25 | ** rights. These rights are described in the Nokia Qt LGPL Exception
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26 | ** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
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27 | **
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28 | ** GNU General Public License Usage
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29 | ** Alternatively, this file may be used under the terms of the GNU
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30 | ** General Public License version 3.0 as published by the Free Software
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31 | ** Foundation and appearing in the file LICENSE.GPL included in the
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32 | ** packaging of this file. Please review the following information to
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33 | ** ensure the GNU General Public License version 3.0 requirements will be
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34 | ** met: http://www.gnu.org/copyleft/gpl.html.
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35 | **
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36 | ** If you have questions regarding the use of this file, please contact
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37 | ** Nokia at qt-info@nokia.com.
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38 | ** $QT_END_LICENSE$
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39 | **
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40 | ****************************************************************************/
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41 |
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42 | #include <QtGui/QImage>
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43 | #include "glwidget.h"
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44 |
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45 | #include <math.h>
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46 |
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47 | #ifndef GL_MULTISAMPLE
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48 | #define GL_MULTISAMPLE 0x809D
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49 | #endif
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50 |
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51 | GLWidget::GLWidget(QWidget *parent)
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52 | : QGLWidget(QGLFormat(QGL::SampleBuffers), parent)
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53 | {
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54 | setWindowTitle(tr("OpenGL pbuffers 2"));
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55 |
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56 | pbuffer = new QGLPixelBuffer(1024, 1024, format(), this);
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57 |
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58 | rot_x = rot_y = rot_z = 0.0f;
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59 | scale = 0.1f;
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60 | anim = new QTimeLine(750, this);
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61 | anim->setUpdateInterval(20);
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62 | connect(anim, SIGNAL(valueChanged(qreal)), SLOT(animate(qreal)));
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63 | connect(anim, SIGNAL(finished()), SLOT(animFinished()));
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64 |
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65 | svg_renderer = new QSvgRenderer(QLatin1String(":/res/bubbles.svg"), this);
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66 | connect(svg_renderer, SIGNAL(repaintNeeded()), this, SLOT(draw()));
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67 |
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68 | logo = QImage(":/res/designer.png");
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69 | logo = logo.convertToFormat(QImage::Format_ARGB32);
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70 |
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71 | makeCurrent(); // need a current context to create the display list
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72 | tile_list = glGenLists(1);
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73 | glNewList(tile_list, GL_COMPILE);
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74 | glBegin(GL_QUADS);
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75 | {
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76 | glTexCoord2f(0.0f, 0.0f); glVertex3f(-1.0f, -1.0f, 1.0f);
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77 | glTexCoord2f(1.0f, 0.0f); glVertex3f( 1.0f, -1.0f, 1.0f);
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78 | glTexCoord2f(1.0f, 1.0f); glVertex3f( 1.0f, 1.0f, 1.0f);
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79 | glTexCoord2f(0.0f, 1.0f); glVertex3f(-1.0f, 1.0f, 1.0f);
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80 |
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81 | glTexCoord2f(1.0f, 0.0f); glVertex3f(-1.0f, -1.0f, -1.0f);
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82 | glTexCoord2f(1.0f, 1.0f); glVertex3f(-1.0f, 1.0f, -1.0f);
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83 | glTexCoord2f(0.0f, 1.0f); glVertex3f( 1.0f, 1.0f, -1.0f);
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84 | glTexCoord2f(0.0f, 0.0f); glVertex3f( 1.0f, -1.0f, -1.0f);
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85 |
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86 | glTexCoord2f(0.0f, 1.0f); glVertex3f(-1.0f, 1.0f, -1.0f);
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87 | glTexCoord2f(0.0f, 0.0f); glVertex3f(-1.0f, 1.0f, 1.0f);
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88 | glTexCoord2f(1.0f, 0.0f); glVertex3f( 1.0f, 1.0f, 1.0f);
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89 | glTexCoord2f(1.0f, 1.0f); glVertex3f( 1.0f, 1.0f, -1.0f);
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90 |
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91 | glTexCoord2f(1.0f, 1.0f); glVertex3f(-1.0f, -1.0f, -1.0f);
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92 | glTexCoord2f(0.0f, 1.0f); glVertex3f( 1.0f, -1.0f, -1.0f);
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93 | glTexCoord2f(0.0f, 0.0f); glVertex3f( 1.0f, -1.0f, 1.0f);
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94 | glTexCoord2f(1.0f, 0.0f); glVertex3f(-1.0f, -1.0f, 1.0f);
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95 |
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96 | glTexCoord2f(1.0f, 0.0f); glVertex3f( 1.0f, -1.0f, -1.0f);
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97 | glTexCoord2f(1.0f, 1.0f); glVertex3f( 1.0f, 1.0f, -1.0f);
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98 | glTexCoord2f(0.0f, 1.0f); glVertex3f( 1.0f, 1.0f, 1.0f);
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99 | glTexCoord2f(0.0f, 0.0f); glVertex3f( 1.0f, -1.0f, 1.0f);
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100 |
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101 | glTexCoord2f(0.0f, 0.0f); glVertex3f(-1.0f, -1.0f, -1.0f);
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102 | glTexCoord2f(1.0f, 0.0f); glVertex3f(-1.0f, -1.0f, 1.0f);
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103 | glTexCoord2f(1.0f, 1.0f); glVertex3f(-1.0f, 1.0f, 1.0f);
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104 | glTexCoord2f(0.0f, 1.0f); glVertex3f(-1.0f, 1.0f, -1.0f);
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105 | }
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106 | glEnd();
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107 | glEndList();
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108 |
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109 | wave = new GLfloat[logo.width()*logo.height()];
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110 | memset(wave, 0, logo.width()*logo.height());
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111 | startTimer(30); // wave timer
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112 |
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113 | pbuffer->makeCurrent();
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114 | dynamicTexture = pbuffer->generateDynamicTexture();
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115 |
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116 | // bind the dynamic texture to the pbuffer - this is a no-op under X11
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117 | hasDynamicTextureUpdate = pbuffer->bindToDynamicTexture(dynamicTexture);
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118 | }
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119 |
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120 | GLWidget::~GLWidget()
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121 | {
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122 | delete[] wave;
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123 | glDeleteLists(tile_list, 1);
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124 | pbuffer->releaseFromDynamicTexture();
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125 | glDeleteTextures(1, &dynamicTexture);
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126 | delete pbuffer;
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127 | }
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128 |
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129 | void GLWidget::paintEvent(QPaintEvent *)
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130 | {
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131 | draw();
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132 | }
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133 |
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134 | void GLWidget::draw()
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135 | {
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136 | QPainter p(this); // used for text overlay
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137 |
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138 | // save the GL state set for QPainter
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139 | p.beginNativePainting();
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140 | saveGLState();
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141 |
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142 | // render the 'bubbles.svg' file into our pbuffer
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143 | QPainter pbuffer_painter(pbuffer);
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144 | svg_renderer->render(&pbuffer_painter);
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145 | pbuffer_painter.end();
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146 | glFlush();
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147 |
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148 | // rendering directly to a texture is not supported on X11 and
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149 | // some Windows implementations, unfortunately
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150 | if (!hasDynamicTextureUpdate)
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151 | pbuffer->updateDynamicTexture(dynamicTexture);
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152 |
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153 | makeCurrent();
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154 | // draw into the GL widget
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155 | glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
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156 | glMatrixMode(GL_PROJECTION);
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157 | glLoadIdentity();
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158 | glFrustum(-1, 1, -1, 1, 10, 100);
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159 | glTranslatef(0.0f, 0.0f, -15.0f);
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160 | glMatrixMode(GL_MODELVIEW);
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161 | glLoadIdentity();
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162 | glViewport(0, 0, width(), height());
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163 |
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164 | glBindTexture(GL_TEXTURE_2D, dynamicTexture);
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165 | glEnable(GL_TEXTURE_2D);
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166 | glEnable(GL_MULTISAMPLE);
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167 | glEnable(GL_CULL_FACE);
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168 | glEnable(GL_BLEND);
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169 | glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
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170 |
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171 | // draw background
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172 | glPushMatrix();
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173 | glScalef(1.7f, 1.7f, 1.7f);
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174 | glColor4f(1.0f, 1.0f, 1.0f, 1.0f);
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175 | glCallList(tile_list);
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176 | glPopMatrix();
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177 |
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178 | const int w = logo.width();
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179 | const int h = logo.height();
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180 |
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181 | glRotatef(rot_x, 1.0f, 0.0f, 0.0f);
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182 | glRotatef(rot_y, 0.0f, 1.0f, 0.0f);
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183 | glRotatef(rot_z, 0.0f, 0.0f, 1.0f);
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184 | glScalef(scale/w, scale/w, scale/w);
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185 |
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186 | glDepthFunc(GL_LESS);
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187 | glEnable(GL_DEPTH_TEST);
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188 |
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189 | // draw the Qt icon
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190 | glTranslatef(-w+1, -h+1, 0.0f);
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191 | for (int y=h-1; y>=0; --y) {
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192 | uint *p = (uint*) logo.scanLine(y);
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193 | uint *end = p + w;
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194 | int x = 0;
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195 | while (p < end) {
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196 | glColor4ub(qRed(*p), qGreen(*p), qBlue(*p), uchar(qAlpha(*p)*.9));
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197 | glTranslatef(0.0f, 0.0f, wave[y*w+x]);
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198 | if (qAlpha(*p) > 128)
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199 | glCallList(tile_list);
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200 | glTranslatef(0.0f, 0.0f, -wave[y*w+x]);
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201 | glTranslatef(2.0f, 0.0f, 0.0f);
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202 | ++x;
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203 | ++p;
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204 | }
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205 | glTranslatef(-w*2.0f, 2.0f, 0.0f);
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206 | }
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207 |
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208 | // restore the GL state that QPainter expects
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209 | restoreGLState();
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210 | p.endNativePainting();
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211 |
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212 | // draw the overlayed text using QPainter
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213 | p.setPen(QColor(197, 197, 197, 157));
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214 | p.setBrush(QColor(197, 197, 197, 127));
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215 | p.drawRect(QRect(0, 0, width(), 50));
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216 | p.setPen(Qt::black);
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217 | p.setBrush(Qt::NoBrush);
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218 | const QString str1(tr("A simple OpenGL pbuffer example."));
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219 | const QString str2(tr("Use the mouse wheel to zoom, press buttons and move mouse to rotate, double-click to flip."));
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220 | QFontMetrics fm(p.font());
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221 | p.drawText(width()/2 - fm.width(str1)/2, 20, str1);
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222 | p.drawText(width()/2 - fm.width(str2)/2, 20 + fm.lineSpacing(), str2);
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223 | }
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224 |
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225 | void GLWidget::mousePressEvent(QMouseEvent *e)
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226 | {
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227 | anchor = e->pos();
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228 | }
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229 |
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230 | void GLWidget::mouseMoveEvent(QMouseEvent *e)
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231 | {
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232 | QPoint diff = e->pos() - anchor;
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233 | if (e->buttons() & Qt::LeftButton) {
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234 | rot_x += diff.y()/5.0f;
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235 | rot_y += diff.x()/5.0f;
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236 | } else if (e->buttons() & Qt::RightButton) {
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237 | rot_z += diff.x()/5.0f;
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238 | }
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239 |
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240 | anchor = e->pos();
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241 | draw();
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242 | }
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243 |
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244 | void GLWidget::wheelEvent(QWheelEvent *e)
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245 | {
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246 | e->delta() > 0 ? scale += scale*0.1f : scale -= scale*0.1f;
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247 | draw();
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248 | }
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249 |
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250 | void GLWidget::mouseDoubleClickEvent(QMouseEvent *)
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251 | {
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252 | anim->start();
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253 | }
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254 |
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255 | void GLWidget::animate(qreal val)
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256 | {
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257 | rot_y = val * 180;
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258 | draw();
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259 | }
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260 |
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261 | void GLWidget::animFinished()
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262 | {
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263 | if (anim->direction() == QTimeLine::Forward)
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264 | anim->setDirection(QTimeLine::Backward);
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265 | else
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266 | anim->setDirection(QTimeLine::Forward);
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267 | }
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268 |
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269 | void GLWidget::saveGLState()
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270 | {
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271 | glPushAttrib(GL_ALL_ATTRIB_BITS);
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272 | glMatrixMode(GL_PROJECTION);
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273 | glPushMatrix();
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274 | glMatrixMode(GL_MODELVIEW);
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275 | glPushMatrix();
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276 | }
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277 |
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278 | void GLWidget::restoreGLState()
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279 | {
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280 | glMatrixMode(GL_PROJECTION);
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281 | glPopMatrix();
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282 | glMatrixMode(GL_MODELVIEW);
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283 | glPopMatrix();
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284 | glPopAttrib();
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285 | }
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286 |
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287 | #define PI 3.14159
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288 |
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289 | void GLWidget::timerEvent(QTimerEvent *)
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290 | {
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291 | if (QApplication::mouseButtons() != 0)
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292 | return;
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293 |
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294 | static bool scale_in = true;
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295 |
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296 | if (scale_in && scale > 35.0f)
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297 | scale_in = false;
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298 | else if (!scale_in && scale < .5f)
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299 | scale_in = true;
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300 |
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301 | scale = scale_in ? scale + scale*0.01f : scale-scale*0.01f;
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302 | rot_z += 0.3f;
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303 | rot_x += 0.1f;
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304 |
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305 | int dx, dy; // disturbance point
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306 | float s, v, W, t;
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307 | int i, j;
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308 | static float wt[128][128];
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309 | const int width = logo.width();
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310 | const int AMP = 5;
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311 |
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312 | dx = dy = width >> 1;
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313 |
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314 | W = .3f;
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315 | v = -4; // wave speed
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316 |
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317 | for (i = 0; i < width; ++i) {
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318 | for ( j = 0; j < width; ++j) {
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319 | s = sqrt((double) ((j - dx) * (j - dx) + (i - dy) * (i - dy)));
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320 | wt[i][j] += 0.1f;
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321 | t = s / v;
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322 | if (s != 0)
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323 | wave[i*width + j] = AMP * sin(2 * PI * W * (wt[i][j] + t)) / (0.2*(s + 2));
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324 | else
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325 | wave[i*width + j] = AMP * sin(2 * PI * W * (wt[i][j] + t));
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326 | }
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327 | }
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328 | }
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