<?xml version="1.0" encoding="UTF-8"?> <!DOCTYPE html> <html lang="en"> <head> <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> <title>fbitem.cpp Example File | Qt Quick 5.12.6</title> <link rel="stylesheet" type="text/css" href="style/offline-simple.css" /> <script type="text/javascript"> document.getElementsByTagName("link").item(0).setAttribute("href", "style/offline.css"); // loading style sheet breaks anchors that were jumped to before // so force jumping to anchor again setTimeout(function() { var anchor = location.hash; // need to jump to different anchor first (e.g. none) location.hash = "#"; setTimeout(function() { location.hash = anchor; }, 0); }, 0); </script> </head> <body> <div class="header" id="qtdocheader"> <div class="main"> <div class="main-rounded"> <div class="navigationbar"> <table><tr> <td >Qt 5.12</td><td ><a href="qtquick-index.html">Qt Quick</a></td><td ><a href="qtquick-quickwidgets-quickwidget-example.html">Qt Quick Widgets Example</a></td><td >fbitem.cpp Example File</td></tr></table><table class="buildversion"><tr> <td id="buildversion" width="100%" align="right"><a href="qtquick-index.html">Qt 5.12.6 Reference Documentation</a></td> </tr></table> </div> </div> <div class="content"> <div class="line"> <div class="content mainContent"> <div class="sidebar"><div class="sidebar-content" id="sidebar-content"></div></div> <h1 class="title">fbitem.cpp Example File</h1> <span class="subtitle">quickwidgets/quickwidget/fbitem.cpp</span> <!-- $$$quickwidgets/quickwidget/fbitem.cpp-description --> <div class="descr"> <a name="details"></a> <pre class="cpp"> <span class="comment">/**************************************************************************** ** ** Copyright (C) 2017 The Qt Company Ltd. ** Contact: https://www.qt.io/licensing/ ** ** This file is part of the examples of the Qt Toolkit. ** ** $QT_BEGIN_LICENSE:BSD$ ** Commercial License Usage ** Licensees holding valid commercial Qt licenses may use this file in ** accordance with the commercial license agreement provided with the ** Software or, alternatively, in accordance with the terms contained in ** a written agreement between you and The Qt Company. For licensing terms ** and conditions see https://www.qt.io/terms-conditions. For further ** information use the contact form at https://www.qt.io/contact-us. ** ** BSD License Usage ** Alternatively, you may use this file under the terms of the BSD license ** as follows: ** ** "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 ** "AS IS" 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." ** ** $QT_END_LICENSE$ ** ****************************************************************************/</span> <span class="preprocessor">#include "fbitem.h"</span> <span class="preprocessor">#include <QtGui/QOpenGLFramebufferObject></span> <span class="preprocessor">#include <QtGui/QOpenGLContext></span> <span class="preprocessor">#include <QtGui/QOpenGLFunctions></span> <span class="preprocessor">#include <QtCore/QDebug></span> <span class="preprocessor">#if QT_CONFIG(opengl)</span> <span class="keyword">class</span> FbRenderer : <span class="keyword">public</span> <span class="type"><a href="qquickframebufferobject.html">QQuickFramebufferObject</a></span><span class="operator">::</span>Renderer { <span class="keyword">public</span>: FbRenderer() { } <span class="comment">// The lifetime of the FBO and this class depends on how QQuickWidget</span> <span class="comment">// manages the scenegraph and context when it comes to showing and hiding</span> <span class="comment">// the widget. The actual behavior is proven by the debug prints.</span> <span class="operator">~</span>FbRenderer() override { qDebug(<span class="string">"FbRenderer destroyed"</span>); } <span class="type">void</span> render() override { <span class="type">QOpenGLFunctions</span> <span class="operator">*</span>f <span class="operator">=</span> <span class="type">QOpenGLContext</span><span class="operator">::</span>currentContext()<span class="operator">-</span><span class="operator">></span>functions(); f<span class="operator">-</span><span class="operator">></span>glClearColor(c<span class="operator">,</span> <span class="number">0</span><span class="operator">,</span> <span class="number">0</span><span class="operator">,</span> <span class="number">1</span>); f<span class="operator">-</span><span class="operator">></span>glClear(GL_COLOR_BUFFER_BIT <span class="operator">|</span> GL_DEPTH_BUFFER_BIT <span class="operator">|</span> GL_STENCIL_BUFFER_BIT); c <span class="operator">+</span><span class="operator">=</span> <span class="number">0.01f</span> <span class="operator">*</span> dir; <span class="keyword">if</span> (c <span class="operator">></span><span class="operator">=</span> <span class="number">1.0f</span> <span class="operator">|</span><span class="operator">|</span> c <span class="operator"><</span><span class="operator">=</span> <span class="number">0.0f</span>) dir <span class="operator">*</span><span class="operator">=</span> <span class="operator">-</span><span class="number">1</span>; update(); } <span class="type">QOpenGLFramebufferObject</span> <span class="operator">*</span>createFramebufferObject(<span class="keyword">const</span> <span class="type">QSize</span> <span class="operator">&</span>size) override { qDebug() <span class="operator"><</span><span class="operator"><</span> <span class="string">"Creating FBO"</span> <span class="operator"><</span><span class="operator"><</span> size; <span class="type">QOpenGLFramebufferObjectFormat</span> format; format<span class="operator">.</span>setAttachment(<span class="type">QOpenGLFramebufferObject</span><span class="operator">::</span>CombinedDepthStencil); <span class="keyword">return</span> <span class="keyword">new</span> <span class="type">QOpenGLFramebufferObject</span>(size<span class="operator">,</span> format); } <span class="keyword">private</span>: <span class="type">float</span> c <span class="operator">=</span> <span class="number">0</span>; <span class="type">int</span> dir <span class="operator">=</span> <span class="number">1</span>; }; <span class="preprocessor">#endif</span> <span class="type"><a href="qquickframebufferobject.html">QQuickFramebufferObject</a></span><span class="operator">::</span>Renderer <span class="operator">*</span>FbItem<span class="operator">::</span>createRenderer() <span class="keyword">const</span> { <span class="preprocessor">#if QT_CONFIG(opengl)</span> <span class="keyword">return</span> <span class="keyword">new</span> FbRenderer; <span class="preprocessor">#else</span> <span class="keyword">return</span> nullptr; <span class="preprocessor">#endif</span> } </pre> </div> <!-- @@@quickwidgets/quickwidget/fbitem.cpp --> </div> </div> </div> </div> </div> <div class="footer"> <p> <acronym title="Copyright">©</acronym> 2019 The Qt Company Ltd. Documentation contributions included herein are the copyrights of their respective owners.<br/> 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.<br/> 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. </p> </div> </body> </html>