lili/qt4-x11
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity
Files
master
qt4-x11/doc/html/opengl-framebufferobject-glwidget-cpp.html
lili 35a2a1d584 init
2025-08-24 20:55:26 +08:00

532 lines
46 KiB
HTML
Raw Permalink Blame History

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en_US" lang="en_US">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>Qt 4.8: glwidget.cpp Example File (opengl/framebufferobject/glwidget.cpp)</title>
<link rel="stylesheet" type="text/css" href="style/style.css" />
<script src="scripts/jquery.js" type="text/javascript"></script>
<script src="scripts/functions.js" type="text/javascript"></script>
<link rel="stylesheet" type="text/css" href="style/superfish.css" />
<link rel="stylesheet" type="text/css" href="style/narrow.css" />
<!--[if IE]>
<meta name="MSSmartTagsPreventParsing" content="true">
<meta http-equiv="imagetoolbar" content="no">
<![endif]-->
<!--[if lt IE 7]>
<link rel="stylesheet" type="text/css" href="style/style_ie6.css">
<![endif]-->
<!--[if IE 7]>
<link rel="stylesheet" type="text/css" href="style/style_ie7.css">
<![endif]-->
<!--[if IE 8]>
<link rel="stylesheet" type="text/css" href="style/style_ie8.css">
<![endif]-->
<script src="scripts/superfish.js" type="text/javascript"></script>
<script src="scripts/narrow.js" type="text/javascript"></script>
</head>
<body class="" onload="CheckEmptyAndLoadList();">
<div class="header" id="qtdocheader">
<div class="content">
<div id="nav-logo">
<a href="index.html">Home</a></div>
<a href="index.html" class="qtref"><span>Qt Reference Documentation</span></a>
<div id="narrowsearch"></div>
<div id="nav-topright">
<ul>
<li class="nav-topright-home"><a href="http://qt.digia.com/">Qt HOME</a></li>
<li class="nav-topright-dev"><a href="http://qt-project.org/">DEV</a></li>
<li class="nav-topright-doc nav-topright-doc-active"><a href="http://qt-project.org/doc/">
DOC</a></li>
<li class="nav-topright-blog"><a href="http://blog.qt.digia.com/">BLOG</a></li>
</ul>
</div>
<div id="shortCut">
<ul>
<li class="shortCut-topleft-inactive"><span><a href="index.html">Qt 4.8</a></span></li>
<li class="shortCut-topleft-active"><a href="http://qt-project.org/doc/">ALL VERSIONS </a></li>
</ul>
</div>
<ul class="sf-menu" id="narrowmenu">
<li><a href="#">API Lookup</a>
<ul>
<li><a href="classes.html">Class index</a></li>
<li><a href="functions.html">Function index</a></li>
<li><a href="modules.html">Modules</a></li>
<li><a href="namespaces.html">Namespaces</a></li>
<li><a href="qtglobal.html">Global Declarations</a></li>
<li><a href="qdeclarativeelements.html">QML elements</a></li>
</ul>
</li>
<li><a href="#">Qt Topics</a>
<ul>
<li><a href="qt-basic-concepts.html">Programming with Qt</a></li>
<li><a href="qtquick.html">Device UIs &amp; Qt Quick</a></li>
<li><a href="qt-gui-concepts.html">UI Design with Qt</a></li>
<li><a href="supported-platforms.html">Supported Platforms</a></li>
<li><a href="technology-apis.html">Qt and Key Technologies</a></li>
<li><a href="best-practices.html">How-To's and Best Practices</a></li>
</ul>
</li>
<li><a href="#">Examples</a>
<ul>
<li><a href="all-examples.html">Examples</a></li>
<li><a href="tutorials.html">Tutorials</a></li>
<li><a href="demos.html">Demos</a></li>
<li><a href="qdeclarativeexamples.html">QML Examples</a></li>
</ul>
</li>
</ul>
</div>
</div>
<div class="wrapper">
<div class="hd">
<span></span>
</div>
<div class="bd group">
<div class="sidebar">
<div class="searchlabel">
Search index:</div>
<div class="search" id="sidebarsearch">
<form id="qtdocsearch" action="" onsubmit="return false;">
<fieldset>
<input type="text" name="searchstring" id="pageType" value="" />
<div id="resultdialog">
<a href="#" id="resultclose">Close</a>
<p id="resultlinks" class="all"><a href="#" id="showallresults">All</a> | <a href="#" id="showapiresults">API</a> | <a href="#" id="showarticleresults">Articles</a> | <a href="#" id="showexampleresults">Examples</a></p>
<p id="searchcount" class="all"><span id="resultcount"></span><span id="apicount"></span><span id="articlecount"></span><span id="examplecount"></span>&nbsp;results:</p>
<ul id="resultlist" class="all">
</ul>
</div>
</fieldset>
</form>
</div>
<div class="box first bottombar" id="lookup">
<h2 title="API Lookup"><span></span>
API Lookup</h2>
<div id="list001" class="list">
<ul id="ul001" >
<li class="defaultLink"><a href="classes.html">Class index</a></li>
<li class="defaultLink"><a href="functions.html">Function index</a></li>
<li class="defaultLink"><a href="modules.html">Modules</a></li>
<li class="defaultLink"><a href="namespaces.html">Namespaces</a></li>
<li class="defaultLink"><a href="qtglobal.html">Global Declarations</a></li>
<li class="defaultLink"><a href="qdeclarativeelements.html">QML elements</a></li>
</ul>
</div>
</div>
<div class="box bottombar" id="topics">
<h2 title="Qt Topics"><span></span>
Qt Topics</h2>
<div id="list002" class="list">
<ul id="ul002" >
<li class="defaultLink"><a href="qt-basic-concepts.html">Programming with Qt</a></li>
<li class="defaultLink"><a href="qtquick.html">Device UIs &amp; Qt Quick</a></li>
<li class="defaultLink"><a href="qt-gui-concepts.html">UI Design with Qt</a></li>
<li class="defaultLink"><a href="supported-platforms.html">Supported Platforms</a></li>
<li class="defaultLink"><a href="technology-apis.html">Qt and Key Technologies</a></li>
<li class="defaultLink"><a href="best-practices.html">How-To's and Best Practices</a></li>
</ul>
</div>
</div>
<div class="box" id="examples">
<h2 title="Examples"><span></span>
Examples</h2>
<div id="list003" class="list">
<ul id="ul003">
<li class="defaultLink"><a href="all-examples.html">Examples</a></li>
<li class="defaultLink"><a href="tutorials.html">Tutorials</a></li>
<li class="defaultLink"><a href="demos.html">Demos</a></li>
<li class="defaultLink"><a href="qdeclarativeexamples.html">QML Examples</a></li>
</ul>
</div>
</div>
</div>
<div class="wrap">
<div class="toolbar">
<div class="breadcrumb toolblock">
<ul>
<li class="first"><a href="index.html">Home</a></li>
<!-- Breadcrumbs go here -->
</ul>
</div>
<div class="toolbuttons toolblock">
<ul>
<li id="smallA" class="t_button">A</li>
<li id="medA" class="t_button active">A</li>
<li id="bigA" class="t_button">A</li>
<li id="print" class="t_button"><a href="javascript:this.print();">
<span>Print</span></a></li>
</ul>
</div>
</div>
<div class="content mainContent">
<h1 class="title">glwidget.cpp Example File</h1>
<span class="small-subtitle">opengl/framebufferobject/glwidget.cpp</span>
<!-- $$$opengl/framebufferobject/glwidget.cpp-description -->
<div class="descr"> <a name="details"></a>
<pre class="cpp"> <span class="comment">/****************************************************************************
**
** Copyright (C) 2015 The Qt Company Ltd.
** Contact: http://www.qt.io/licensing/
**
** This file is part of the examples of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:BSD$
** You may use this file under the terms of the BSD license as follows:
**
** &quot;Redistribution and use in source and binary forms, with or without
** modification, are permitted provided that the following conditions are
** met:
** * Redistributions of source code must retain the above copyright
** notice, this list of conditions and the following disclaimer.
** * Redistributions in binary form must reproduce the above copyright
** notice, this list of conditions and the following disclaimer in
** the documentation and/or other materials provided with the
** distribution.
** * Neither the name of The Qt Company Ltd nor the names of its
** contributors may be used to endorse or promote products derived
** from this software without specific prior written permission.
**
**
** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
** &quot;AS IS&quot; AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.&quot;
**
** $QT_END_LICENSE$
**
****************************************************************************/</span>
<span class="preprocessor">#include &lt;QtGui/QImage&gt;</span>
<span class="preprocessor">#include &quot;glwidget.h&quot;</span>
<span class="preprocessor">#include &lt;math.h&gt;</span>
<span class="preprocessor">#ifndef GL_MULTISAMPLE</span>
<span class="preprocessor">#define GL_MULTISAMPLE 0x809D</span>
<span class="preprocessor">#endif</span>
GLWidget<span class="operator">::</span>GLWidget(<span class="type"><a href="qwidget.html">QWidget</a></span> <span class="operator">*</span>parent)
: <span class="type"><a href="qglwidget.html">QGLWidget</a></span>(<span class="type"><a href="qglformat.html">QGLFormat</a></span>(QGL<span class="operator">::</span>SampleBuffers<span class="operator">|</span>QGL<span class="operator">::</span>AlphaChannel)<span class="operator">,</span> parent)
{
setWindowTitle(tr(<span class="string">&quot;OpenGL framebuffer objects&quot;</span>));
makeCurrent();
<span class="keyword">if</span> (<span class="type"><a href="qglframebufferobject.html">QGLFramebufferObject</a></span><span class="operator">::</span>hasOpenGLFramebufferBlit()) {
<span class="type"><a href="qglframebufferobjectformat.html">QGLFramebufferObjectFormat</a></span> format;
format<span class="operator">.</span>setSamples(<span class="number">4</span>);
format<span class="operator">.</span>setAttachment(<span class="type"><a href="qglframebufferobject.html">QGLFramebufferObject</a></span><span class="operator">::</span>CombinedDepthStencil);
render_fbo <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qglframebufferobject.html">QGLFramebufferObject</a></span>(<span class="number">512</span><span class="operator">,</span> <span class="number">512</span><span class="operator">,</span> format);
texture_fbo <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qglframebufferobject.html">QGLFramebufferObject</a></span>(<span class="number">512</span><span class="operator">,</span> <span class="number">512</span>);
} <span class="keyword">else</span> {
render_fbo <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qglframebufferobject.html">QGLFramebufferObject</a></span>(<span class="number">1024</span><span class="operator">,</span> <span class="number">1024</span>);
texture_fbo <span class="operator">=</span> render_fbo;
}
rot_x <span class="operator">=</span> rot_y <span class="operator">=</span> rot_z <span class="operator">=</span> <span class="number">0.0f</span>;
scale <span class="operator">=</span> <span class="number">0.1f</span>;
anim <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qtimeline.html">QTimeLine</a></span>(<span class="number">750</span><span class="operator">,</span> <span class="keyword">this</span>);
anim<span class="operator">-</span><span class="operator">&gt;</span>setUpdateInterval(<span class="number">20</span>);
connect(anim<span class="operator">,</span> SIGNAL(valueChanged(<span class="type"><a href="qtglobal.html#qreal-typedef">qreal</a></span>))<span class="operator">,</span> SLOT(animate(<span class="type"><a href="qtglobal.html#qreal-typedef">qreal</a></span>)));
connect(anim<span class="operator">,</span> SIGNAL(finished())<span class="operator">,</span> SLOT(animFinished()));
svg_renderer <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qsvgrenderer.html">QSvgRenderer</a></span>(QLatin1String(<span class="string">&quot;:/res/bubbles.svg&quot;</span>)<span class="operator">,</span> <span class="keyword">this</span>);
connect(svg_renderer<span class="operator">,</span> SIGNAL(repaintNeeded())<span class="operator">,</span> <span class="keyword">this</span><span class="operator">,</span> SLOT(draw()));
logo <span class="operator">=</span> <span class="type"><a href="qimage.html">QImage</a></span>(<span class="string">&quot;:/res/designer.png&quot;</span>);
logo <span class="operator">=</span> logo<span class="operator">.</span>convertToFormat(<span class="type"><a href="qimage.html">QImage</a></span><span class="operator">::</span>Format_ARGB32);
tile_list <span class="operator">=</span> glGenLists(<span class="number">1</span>);
glNewList(tile_list<span class="operator">,</span> GL_COMPILE);
glBegin(GL_QUADS);
{
glTexCoord2f(<span class="number">0.0f</span><span class="operator">,</span> <span class="number">0.0f</span>); glVertex3f(<span class="operator">-</span><span class="number">1.0f</span><span class="operator">,</span> <span class="operator">-</span><span class="number">1.0f</span><span class="operator">,</span> <span class="number">1.0f</span>);
glTexCoord2f(<span class="number">1.0f</span><span class="operator">,</span> <span class="number">0.0f</span>); glVertex3f( <span class="number">1.0f</span><span class="operator">,</span> <span class="operator">-</span><span class="number">1.0f</span><span class="operator">,</span> <span class="number">1.0f</span>);
glTexCoord2f(<span class="number">1.0f</span><span class="operator">,</span> <span class="number">1.0f</span>); glVertex3f( <span class="number">1.0f</span><span class="operator">,</span> <span class="number">1.0f</span><span class="operator">,</span> <span class="number">1.0f</span>);
glTexCoord2f(<span class="number">0.0f</span><span class="operator">,</span> <span class="number">1.0f</span>); glVertex3f(<span class="operator">-</span><span class="number">1.0f</span><span class="operator">,</span> <span class="number">1.0f</span><span class="operator">,</span> <span class="number">1.0f</span>);
glTexCoord2f(<span class="number">1.0f</span><span class="operator">,</span> <span class="number">0.0f</span>); glVertex3f(<span class="operator">-</span><span class="number">1.0f</span><span class="operator">,</span> <span class="operator">-</span><span class="number">1.0f</span><span class="operator">,</span> <span class="operator">-</span><span class="number">1.0f</span>);
glTexCoord2f(<span class="number">1.0f</span><span class="operator">,</span> <span class="number">1.0f</span>); glVertex3f(<span class="operator">-</span><span class="number">1.0f</span><span class="operator">,</span> <span class="number">1.0f</span><span class="operator">,</span> <span class="operator">-</span><span class="number">1.0f</span>);
glTexCoord2f(<span class="number">0.0f</span><span class="operator">,</span> <span class="number">1.0f</span>); glVertex3f( <span class="number">1.0f</span><span class="operator">,</span> <span class="number">1.0f</span><span class="operator">,</span> <span class="operator">-</span><span class="number">1.0f</span>);
glTexCoord2f(<span class="number">0.0f</span><span class="operator">,</span> <span class="number">0.0f</span>); glVertex3f( <span class="number">1.0f</span><span class="operator">,</span> <span class="operator">-</span><span class="number">1.0f</span><span class="operator">,</span> <span class="operator">-</span><span class="number">1.0f</span>);
glTexCoord2f(<span class="number">0.0f</span><span class="operator">,</span> <span class="number">1.0f</span>); glVertex3f(<span class="operator">-</span><span class="number">1.0f</span><span class="operator">,</span> <span class="number">1.0f</span><span class="operator">,</span> <span class="operator">-</span><span class="number">1.0f</span>);
glTexCoord2f(<span class="number">0.0f</span><span class="operator">,</span> <span class="number">0.0f</span>); glVertex3f(<span class="operator">-</span><span class="number">1.0f</span><span class="operator">,</span> <span class="number">1.0f</span><span class="operator">,</span> <span class="number">1.0f</span>);
glTexCoord2f(<span class="number">1.0f</span><span class="operator">,</span> <span class="number">0.0f</span>); glVertex3f( <span class="number">1.0f</span><span class="operator">,</span> <span class="number">1.0f</span><span class="operator">,</span> <span class="number">1.0f</span>);
glTexCoord2f(<span class="number">1.0f</span><span class="operator">,</span> <span class="number">1.0f</span>); glVertex3f( <span class="number">1.0f</span><span class="operator">,</span> <span class="number">1.0f</span><span class="operator">,</span> <span class="operator">-</span><span class="number">1.0f</span>);
glTexCoord2f(<span class="number">1.0f</span><span class="operator">,</span> <span class="number">1.0f</span>); glVertex3f(<span class="operator">-</span><span class="number">1.0f</span><span class="operator">,</span> <span class="operator">-</span><span class="number">1.0f</span><span class="operator">,</span> <span class="operator">-</span><span class="number">1.0f</span>);
glTexCoord2f(<span class="number">0.0f</span><span class="operator">,</span> <span class="number">1.0f</span>); glVertex3f( <span class="number">1.0f</span><span class="operator">,</span> <span class="operator">-</span><span class="number">1.0f</span><span class="operator">,</span> <span class="operator">-</span><span class="number">1.0f</span>);
glTexCoord2f(<span class="number">0.0f</span><span class="operator">,</span> <span class="number">0.0f</span>); glVertex3f( <span class="number">1.0f</span><span class="operator">,</span> <span class="operator">-</span><span class="number">1.0f</span><span class="operator">,</span> <span class="number">1.0f</span>);
glTexCoord2f(<span class="number">1.0f</span><span class="operator">,</span> <span class="number">0.0f</span>); glVertex3f(<span class="operator">-</span><span class="number">1.0f</span><span class="operator">,</span> <span class="operator">-</span><span class="number">1.0f</span><span class="operator">,</span> <span class="number">1.0f</span>);
glTexCoord2f(<span class="number">1.0f</span><span class="operator">,</span> <span class="number">0.0f</span>); glVertex3f( <span class="number">1.0f</span><span class="operator">,</span> <span class="operator">-</span><span class="number">1.0f</span><span class="operator">,</span> <span class="operator">-</span><span class="number">1.0f</span>);
glTexCoord2f(<span class="number">1.0f</span><span class="operator">,</span> <span class="number">1.0f</span>); glVertex3f( <span class="number">1.0f</span><span class="operator">,</span> <span class="number">1.0f</span><span class="operator">,</span> <span class="operator">-</span><span class="number">1.0f</span>);
glTexCoord2f(<span class="number">0.0f</span><span class="operator">,</span> <span class="number">1.0f</span>); glVertex3f( <span class="number">1.0f</span><span class="operator">,</span> <span class="number">1.0f</span><span class="operator">,</span> <span class="number">1.0f</span>);
glTexCoord2f(<span class="number">0.0f</span><span class="operator">,</span> <span class="number">0.0f</span>); glVertex3f( <span class="number">1.0f</span><span class="operator">,</span> <span class="operator">-</span><span class="number">1.0f</span><span class="operator">,</span> <span class="number">1.0f</span>);
glTexCoord2f(<span class="number">0.0f</span><span class="operator">,</span> <span class="number">0.0f</span>); glVertex3f(<span class="operator">-</span><span class="number">1.0f</span><span class="operator">,</span> <span class="operator">-</span><span class="number">1.0f</span><span class="operator">,</span> <span class="operator">-</span><span class="number">1.0f</span>);
glTexCoord2f(<span class="number">1.0f</span><span class="operator">,</span> <span class="number">0.0f</span>); glVertex3f(<span class="operator">-</span><span class="number">1.0f</span><span class="operator">,</span> <span class="operator">-</span><span class="number">1.0f</span><span class="operator">,</span> <span class="number">1.0f</span>);
glTexCoord2f(<span class="number">1.0f</span><span class="operator">,</span> <span class="number">1.0f</span>); glVertex3f(<span class="operator">-</span><span class="number">1.0f</span><span class="operator">,</span> <span class="number">1.0f</span><span class="operator">,</span> <span class="number">1.0f</span>);
glTexCoord2f(<span class="number">0.0f</span><span class="operator">,</span> <span class="number">1.0f</span>); glVertex3f(<span class="operator">-</span><span class="number">1.0f</span><span class="operator">,</span> <span class="number">1.0f</span><span class="operator">,</span> <span class="operator">-</span><span class="number">1.0f</span>);
}
glEnd();
glEndList();
wave <span class="operator">=</span> <span class="keyword">new</span> GLfloat<span class="operator">[</span>logo<span class="operator">.</span>width()<span class="operator">*</span>logo<span class="operator">.</span>height()<span class="operator">]</span>;
memset(wave<span class="operator">,</span> <span class="number">0</span><span class="operator">,</span> logo<span class="operator">.</span>width()<span class="operator">*</span>logo<span class="operator">.</span>height());
startTimer(<span class="number">30</span>); <span class="comment">// wave timer</span>
}
GLWidget<span class="operator">::</span><span class="operator">~</span>GLWidget()
{
<span class="keyword">delete</span><span class="operator">[</span><span class="operator">]</span> wave;
glDeleteLists(tile_list<span class="operator">,</span> <span class="number">1</span>);
<span class="keyword">delete</span> texture_fbo;
<span class="keyword">if</span> (render_fbo <span class="operator">!</span><span class="operator">=</span> texture_fbo)
<span class="keyword">delete</span> render_fbo;
}
<span class="type">void</span> GLWidget<span class="operator">::</span>paintEvent(<span class="type"><a href="qpaintevent.html">QPaintEvent</a></span> <span class="operator">*</span>)
{
draw();
}
<span class="type">void</span> GLWidget<span class="operator">::</span>draw()
{
<span class="type"><a href="qpainter.html">QPainter</a></span> p(<span class="keyword">this</span>); <span class="comment">// used for text overlay</span>
<span class="comment">// save the GL state set for QPainter</span>
saveGLState();
<span class="comment">// render the 'bubbles.svg' file into our framebuffer object</span>
<span class="type"><a href="qpainter.html">QPainter</a></span> fbo_painter(render_fbo);
svg_renderer<span class="operator">-</span><span class="operator">&gt;</span>render(<span class="operator">&amp;</span>fbo_painter);
fbo_painter<span class="operator">.</span>end();
<span class="keyword">if</span> (render_fbo <span class="operator">!</span><span class="operator">=</span> texture_fbo) {
<span class="type"><a href="qrect.html">QRect</a></span> rect(<span class="number">0</span><span class="operator">,</span> <span class="number">0</span><span class="operator">,</span> render_fbo<span class="operator">-</span><span class="operator">&gt;</span>width()<span class="operator">,</span> render_fbo<span class="operator">-</span><span class="operator">&gt;</span>height());
<span class="type"><a href="qglframebufferobject.html">QGLFramebufferObject</a></span><span class="operator">::</span>blitFramebuffer(texture_fbo<span class="operator">,</span> rect<span class="operator">,</span>
render_fbo<span class="operator">,</span> rect);
}
<span class="comment">// draw into the GL widget</span>
glClear(GL_COLOR_BUFFER_BIT <span class="operator">|</span> GL_DEPTH_BUFFER_BIT);
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
glFrustum(<span class="operator">-</span><span class="number">1</span><span class="operator">,</span> <span class="number">1</span><span class="operator">,</span> <span class="operator">-</span><span class="number">1</span><span class="operator">,</span> <span class="number">1</span><span class="operator">,</span> <span class="number">10</span><span class="operator">,</span> <span class="number">100</span>);
glTranslatef(<span class="number">0.0f</span><span class="operator">,</span> <span class="number">0.0f</span><span class="operator">,</span> <span class="operator">-</span><span class="number">15.0f</span>);
glMatrixMode(GL_MODELVIEW);
glLoadIdentity();
glViewport(<span class="number">0</span><span class="operator">,</span> <span class="number">0</span><span class="operator">,</span> width()<span class="operator">,</span> height());
glEnable(GL_BLEND);
glBlendFunc(GL_SRC_ALPHA<span class="operator">,</span> GL_ONE_MINUS_SRC_ALPHA);
glBindTexture(GL_TEXTURE_2D<span class="operator">,</span> texture_fbo<span class="operator">-</span><span class="operator">&gt;</span>texture());
glTexParameteri(GL_TEXTURE_2D<span class="operator">,</span> GL_TEXTURE_MAG_FILTER<span class="operator">,</span> GL_LINEAR);
glTexParameteri(GL_TEXTURE_2D<span class="operator">,</span> GL_TEXTURE_MIN_FILTER<span class="operator">,</span> GL_LINEAR);
glEnable(GL_TEXTURE_2D);
glEnable(GL_MULTISAMPLE);
glEnable(GL_CULL_FACE);
<span class="comment">// draw background</span>
glPushMatrix();
glScalef(<span class="number">1.7f</span><span class="operator">,</span> <span class="number">1.7f</span><span class="operator">,</span> <span class="number">1.7f</span>);
glColor4f(<span class="number">1.0f</span><span class="operator">,</span> <span class="number">1.0f</span><span class="operator">,</span> <span class="number">1.0f</span><span class="operator">,</span> <span class="number">1.0f</span>);
glCallList(tile_list);
glPopMatrix();
<span class="keyword">const</span> <span class="type">int</span> w <span class="operator">=</span> logo<span class="operator">.</span>width();
<span class="keyword">const</span> <span class="type">int</span> h <span class="operator">=</span> logo<span class="operator">.</span>height();
glRotatef(rot_x<span class="operator">,</span> <span class="number">1.0f</span><span class="operator">,</span> <span class="number">0.0f</span><span class="operator">,</span> <span class="number">0.0f</span>);
glRotatef(rot_y<span class="operator">,</span> <span class="number">0.0f</span><span class="operator">,</span> <span class="number">1.0f</span><span class="operator">,</span> <span class="number">0.0f</span>);
glRotatef(rot_z<span class="operator">,</span> <span class="number">0.0f</span><span class="operator">,</span> <span class="number">0.0f</span><span class="operator">,</span> <span class="number">1.0f</span>);
glScalef(scale<span class="operator">/</span>w<span class="operator">,</span> scale<span class="operator">/</span>w<span class="operator">,</span> scale<span class="operator">/</span>w);
glDepthFunc(GL_LESS);
glEnable(GL_DEPTH_TEST);
<span class="comment">// draw the Qt icon</span>
glTranslatef(<span class="operator">-</span>w<span class="operator">+</span><span class="number">1</span><span class="operator">,</span> <span class="operator">-</span>h<span class="operator">+</span><span class="number">1</span><span class="operator">,</span> <span class="number">0.0f</span>);
<span class="keyword">for</span> (<span class="type">int</span> y<span class="operator">=</span>h<span class="operator">-</span><span class="number">1</span>; y<span class="operator">&gt;</span><span class="operator">=</span><span class="number">0</span>; <span class="operator">-</span><span class="operator">-</span>y) {
<span class="type"><a href="qtglobal.html#uint-typedef">uint</a></span> <span class="operator">*</span>p <span class="operator">=</span> (<span class="type"><a href="qtglobal.html#uint-typedef">uint</a></span><span class="operator">*</span>) logo<span class="operator">.</span>scanLine(y);
<span class="type"><a href="qtglobal.html#uint-typedef">uint</a></span> <span class="operator">*</span>end <span class="operator">=</span> p <span class="operator">+</span> w;
<span class="type">int</span> x <span class="operator">=</span> <span class="number">0</span>;
<span class="keyword">while</span> (p <span class="operator">&lt;</span> end) {
glColor4ub(<a href="qcolor.html#qRed">qRed</a>(<span class="operator">*</span>p)<span class="operator">,</span> <a href="qcolor.html#qGreen">qGreen</a>(<span class="operator">*</span>p)<span class="operator">,</span> <a href="qcolor.html#qBlue">qBlue</a>(<span class="operator">*</span>p)<span class="operator">,</span> <span class="type"><a href="qtglobal.html#uchar-typedef">uchar</a></span>(<a href="qcolor.html#qAlpha">qAlpha</a>(<span class="operator">*</span>p)<span class="operator">*</span><span class="operator">.</span><span class="number">9</span>));
glTranslatef(<span class="number">0.0f</span><span class="operator">,</span> <span class="number">0.0f</span><span class="operator">,</span> wave<span class="operator">[</span>y<span class="operator">*</span>w<span class="operator">+</span>x<span class="operator">]</span>);
<span class="keyword">if</span> (<a href="qcolor.html#qAlpha">qAlpha</a>(<span class="operator">*</span>p) <span class="operator">&gt;</span> <span class="number">128</span>)
glCallList(tile_list);
glTranslatef(<span class="number">0.0f</span><span class="operator">,</span> <span class="number">0.0f</span><span class="operator">,</span> <span class="operator">-</span>wave<span class="operator">[</span>y<span class="operator">*</span>w<span class="operator">+</span>x<span class="operator">]</span>);
glTranslatef(<span class="number">2.0f</span><span class="operator">,</span> <span class="number">0.0f</span><span class="operator">,</span> <span class="number">0.0f</span>);
<span class="operator">+</span><span class="operator">+</span>x;
<span class="operator">+</span><span class="operator">+</span>p;
}
glTranslatef(<span class="operator">-</span>w<span class="operator">*</span><span class="number">2.0f</span><span class="operator">,</span> <span class="number">2.0f</span><span class="operator">,</span> <span class="number">0.0f</span>);
}
<span class="comment">// restore the GL state that QPainter expects</span>
restoreGLState();
<span class="comment">// draw the overlayed text using QPainter</span>
p<span class="operator">.</span>setPen(<span class="type"><a href="qcolor.html">QColor</a></span>(<span class="number">197</span><span class="operator">,</span> <span class="number">197</span><span class="operator">,</span> <span class="number">197</span><span class="operator">,</span> <span class="number">157</span>));
p<span class="operator">.</span>setBrush(<span class="type"><a href="qcolor.html">QColor</a></span>(<span class="number">197</span><span class="operator">,</span> <span class="number">197</span><span class="operator">,</span> <span class="number">197</span><span class="operator">,</span> <span class="number">127</span>));
p<span class="operator">.</span>drawRect(<span class="type"><a href="qrect.html">QRect</a></span>(<span class="number">0</span><span class="operator">,</span> <span class="number">0</span><span class="operator">,</span> width()<span class="operator">,</span> <span class="number">50</span>));
p<span class="operator">.</span>setPen(<span class="type"><a href="qt.html">Qt</a></span><span class="operator">::</span>black);
p<span class="operator">.</span>setBrush(<span class="type"><a href="qt.html">Qt</a></span><span class="operator">::</span>NoBrush);
<span class="keyword">const</span> <span class="type"><a href="qstring.html">QString</a></span> str1(tr(<span class="string">&quot;A simple OpenGL framebuffer object example.&quot;</span>));
<span class="keyword">const</span> <span class="type"><a href="qstring.html">QString</a></span> str2(tr(<span class="string">&quot;Use the mouse wheel to zoom, press buttons and move mouse to rotate, double-click to flip.&quot;</span>));
<span class="type"><a href="qfontmetrics.html">QFontMetrics</a></span> fm(p<span class="operator">.</span>font());
p<span class="operator">.</span>drawText(width()<span class="operator">/</span><span class="number">2</span> <span class="operator">-</span> fm<span class="operator">.</span>width(str1)<span class="operator">/</span><span class="number">2</span><span class="operator">,</span> <span class="number">20</span><span class="operator">,</span> str1);
p<span class="operator">.</span>drawText(width()<span class="operator">/</span><span class="number">2</span> <span class="operator">-</span> fm<span class="operator">.</span>width(str2)<span class="operator">/</span><span class="number">2</span><span class="operator">,</span> <span class="number">20</span> <span class="operator">+</span> fm<span class="operator">.</span>lineSpacing()<span class="operator">,</span> str2);
}
<span class="type">void</span> GLWidget<span class="operator">::</span>mousePressEvent(<span class="type"><a href="qmouseevent.html">QMouseEvent</a></span> <span class="operator">*</span>e)
{
anchor <span class="operator">=</span> e<span class="operator">-</span><span class="operator">&gt;</span>pos();
}
<span class="type">void</span> GLWidget<span class="operator">::</span>mouseMoveEvent(<span class="type"><a href="qmouseevent.html">QMouseEvent</a></span> <span class="operator">*</span>e)
{
<span class="type"><a href="qpoint.html">QPoint</a></span> diff <span class="operator">=</span> e<span class="operator">-</span><span class="operator">&gt;</span>pos() <span class="operator">-</span> anchor;
<span class="keyword">if</span> (e<span class="operator">-</span><span class="operator">&gt;</span>buttons() <span class="operator">&amp;</span> <span class="type"><a href="qt.html">Qt</a></span><span class="operator">::</span>LeftButton) {
rot_x <span class="operator">+</span><span class="operator">=</span> diff<span class="operator">.</span>y()<span class="operator">/</span><span class="number">5.0f</span>;
rot_y <span class="operator">+</span><span class="operator">=</span> diff<span class="operator">.</span>x()<span class="operator">/</span><span class="number">5.0f</span>;
} <span class="keyword">else</span> <span class="keyword">if</span> (e<span class="operator">-</span><span class="operator">&gt;</span>buttons() <span class="operator">&amp;</span> <span class="type"><a href="qt.html">Qt</a></span><span class="operator">::</span>RightButton) {
rot_z <span class="operator">+</span><span class="operator">=</span> diff<span class="operator">.</span>x()<span class="operator">/</span><span class="number">5.0f</span>;
}
anchor <span class="operator">=</span> e<span class="operator">-</span><span class="operator">&gt;</span>pos();
draw();
}
<span class="type">void</span> GLWidget<span class="operator">::</span>wheelEvent(<span class="type"><a href="qwheelevent.html">QWheelEvent</a></span> <span class="operator">*</span>e)
{
e<span class="operator">-</span><span class="operator">&gt;</span>delta() <span class="operator">&gt;</span> <span class="number">0</span> <span class="operator">?</span> scale <span class="operator">+</span><span class="operator">=</span> scale<span class="operator">*</span><span class="number">0.1f</span> : scale <span class="operator">-</span><span class="operator">=</span> scale<span class="operator">*</span><span class="number">0.1f</span>;
draw();
}
<span class="type">void</span> GLWidget<span class="operator">::</span>mouseDoubleClickEvent(<span class="type"><a href="qmouseevent.html">QMouseEvent</a></span> <span class="operator">*</span>)
{
anim<span class="operator">-</span><span class="operator">&gt;</span>start();
}
<span class="type">void</span> GLWidget<span class="operator">::</span>animate(<span class="type"><a href="qtglobal.html#qreal-typedef">qreal</a></span> val)
{
rot_y <span class="operator">=</span> val <span class="operator">*</span> <span class="number">180</span>;
draw();
}
<span class="type">void</span> GLWidget<span class="operator">::</span>animFinished()
{
<span class="keyword">if</span> (anim<span class="operator">-</span><span class="operator">&gt;</span>direction() <span class="operator">=</span><span class="operator">=</span> <span class="type"><a href="qtimeline.html">QTimeLine</a></span><span class="operator">::</span>Forward)
anim<span class="operator">-</span><span class="operator">&gt;</span>setDirection(<span class="type"><a href="qtimeline.html">QTimeLine</a></span><span class="operator">::</span>Backward);
<span class="keyword">else</span>
anim<span class="operator">-</span><span class="operator">&gt;</span>setDirection(<span class="type"><a href="qtimeline.html">QTimeLine</a></span><span class="operator">::</span>Forward);
}
<span class="type">void</span> GLWidget<span class="operator">::</span>saveGLState()
{
glPushAttrib(GL_ALL_ATTRIB_BITS);
glMatrixMode(GL_PROJECTION);
glPushMatrix();
glMatrixMode(GL_MODELVIEW);
glPushMatrix();
}
<span class="type">void</span> GLWidget<span class="operator">::</span>restoreGLState()
{
glMatrixMode(GL_PROJECTION);
glPopMatrix();
glMatrixMode(GL_MODELVIEW);
glPopMatrix();
glPopAttrib();
}
<span class="preprocessor">#define PI 3.14159</span>
<span class="type">void</span> GLWidget<span class="operator">::</span>timerEvent(<span class="type"><a href="qtimerevent.html">QTimerEvent</a></span> <span class="operator">*</span>)
{
<span class="keyword">if</span> (<span class="type"><a href="qapplication.html">QApplication</a></span><span class="operator">::</span>mouseButtons() <span class="operator">!</span><span class="operator">=</span> <span class="number">0</span>)
<span class="keyword">return</span>;
<span class="keyword">static</span> <span class="type">bool</span> scale_in <span class="operator">=</span> <span class="keyword">true</span>;
<span class="keyword">if</span> (scale_in <span class="operator">&amp;</span><span class="operator">&amp;</span> scale <span class="operator">&gt;</span> <span class="number">35.0f</span>)
scale_in <span class="operator">=</span> <span class="keyword">false</span>;
<span class="keyword">else</span> <span class="keyword">if</span> (<span class="operator">!</span>scale_in <span class="operator">&amp;</span><span class="operator">&amp;</span> scale <span class="operator">&lt;</span> <span class="operator">.</span><span class="number">5f</span>)
scale_in <span class="operator">=</span> <span class="keyword">true</span>;
scale <span class="operator">=</span> scale_in <span class="operator">?</span> scale <span class="operator">+</span> scale<span class="operator">*</span><span class="number">0.01f</span> : scale<span class="operator">-</span>scale<span class="operator">*</span><span class="number">0.01f</span>;
rot_z <span class="operator">+</span><span class="operator">=</span> <span class="number">0.3f</span>;
rot_x <span class="operator">+</span><span class="operator">=</span> <span class="number">0.1f</span>;
<span class="type">int</span> dx<span class="operator">,</span> dy; <span class="comment">// disturbance point</span>
<span class="type">float</span> s<span class="operator">,</span> v<span class="operator">,</span> W<span class="operator">,</span> t;
<span class="type">int</span> i<span class="operator">,</span> j;
<span class="keyword">static</span> <span class="type">float</span> wt<span class="operator">[</span><span class="number">128</span><span class="operator">]</span><span class="operator">[</span><span class="number">128</span><span class="operator">]</span>;
<span class="keyword">const</span> <span class="type">int</span> width <span class="operator">=</span> logo<span class="operator">.</span>width();
<span class="keyword">const</span> <span class="type">int</span> AMP <span class="operator">=</span> <span class="number">5</span>;
dx <span class="operator">=</span> dy <span class="operator">=</span> width <span class="operator">&gt;</span><span class="operator">&gt;</span> <span class="number">1</span>;
W <span class="operator">=</span> <span class="operator">.</span><span class="number">3f</span>;
v <span class="operator">=</span> <span class="operator">-</span><span class="number">4</span>; <span class="comment">// wave speed</span>
<span class="keyword">for</span> (i <span class="operator">=</span> <span class="number">0</span>; i <span class="operator">&lt;</span> width; <span class="operator">+</span><span class="operator">+</span>i) {
<span class="keyword">for</span> ( j <span class="operator">=</span> <span class="number">0</span>; j <span class="operator">&lt;</span> width; <span class="operator">+</span><span class="operator">+</span>j) {
s <span class="operator">=</span> sqrt((<span class="type">double</span>) ((j <span class="operator">-</span> dx) <span class="operator">*</span> (j <span class="operator">-</span> dx) <span class="operator">+</span> (i <span class="operator">-</span> dy) <span class="operator">*</span> (i <span class="operator">-</span> dy)));
wt<span class="operator">[</span>i<span class="operator">]</span><span class="operator">[</span>j<span class="operator">]</span> <span class="operator">+</span><span class="operator">=</span> <span class="number">0.1f</span>;
t <span class="operator">=</span> s <span class="operator">/</span> v;
<span class="keyword">if</span> (s <span class="operator">!</span><span class="operator">=</span> <span class="number">0</span>)
wave<span class="operator">[</span>i<span class="operator">*</span>width <span class="operator">+</span> j<span class="operator">]</span> <span class="operator">=</span> AMP <span class="operator">*</span> sin(<span class="number">2</span> <span class="operator">*</span> PI <span class="operator">*</span> W <span class="operator">*</span> (wt<span class="operator">[</span>i<span class="operator">]</span><span class="operator">[</span>j<span class="operator">]</span> <span class="operator">+</span> t)) <span class="operator">/</span> (<span class="number">0.2</span><span class="operator">*</span>(s <span class="operator">+</span> <span class="number">2</span>));
<span class="keyword">else</span>
wave<span class="operator">[</span>i<span class="operator">*</span>width <span class="operator">+</span> j<span class="operator">]</span> <span class="operator">=</span> AMP <span class="operator">*</span> sin(<span class="number">2</span> <span class="operator">*</span> PI <span class="operator">*</span> W <span class="operator">*</span> (wt<span class="operator">[</span>i<span class="operator">]</span><span class="operator">[</span>j<span class="operator">]</span> <span class="operator">+</span> t));
}
}
}</pre>
</div>
<!-- @@@opengl/framebufferobject/glwidget.cpp -->
</div>
</div>
</div>
<div class="ft">
<span></span>
</div>
</div>
<div class="footer">
<p>
<acronym title="Copyright">&copy;</acronym> 2015 The Qt Company Ltd.
Documentation contributions included herein are the copyrights of
their respective owners.</p>
<br />
<p>
The documentation provided herein is licensed under the terms of the
<a href="http://www.gnu.org/licenses/fdl.html">GNU Free Documentation
License version 1.3</a> as published by the Free Software Foundation.</p>
<p>
Documentation sources may be obtained from <a href="http://www.qt-project.org">
www.qt-project.org</a>.</p>
<br />
<p>
Qt and respective logos are trademarks of The Qt Company Ltd
in Finland and/or other countries worldwide. All other trademarks are property
of their respective owners. <a title="Privacy Policy"
href="http://en.gitorious.org/privacy_policy/">Privacy Policy</a></p>
</div>
<script src="scripts/functions.js" type="text/javascript"></script>
</body>
</html>
Reference in New Issue View Git Blame Copy Permalink