<?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>main.cpp Example File | Qt GUI 5.9</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 5.9</td><td ><a href="qtgui-index.html">Qt GUI</a></td><td ><a href="qtgui-openglwindow-example.html">OpenGL Window Example</a></td><td >main.cpp Example File</td></tr></table><table class="buildversion"><tr>
<td id="buildversion" width="100%" align="right">Qt 5.9.4 Reference Documentation</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">main.cpp Example File</h1>
<span class="subtitle">openglwindow/main.cpp</span>
<!-- $$$openglwindow/main.cpp-description -->
<div class="descr"> <a name="details"></a>
<pre class="cpp">
<span class="comment">/****************************************************************************
**
** Copyright (C) 2016 The Qt Company Ltd.
** Contact: https://www.qt.io/licensing/
**
** This file is part of the documentation 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 "openglwindow.h"</span>
<span class="preprocessor">#include <QtGui/QGuiApplication></span>
<span class="preprocessor">#include <QtGui/QMatrix4x4></span>
<span class="preprocessor">#include <QtGui/QOpenGLShaderProgram></span>
<span class="preprocessor">#include <QtGui/QScreen></span>
<span class="preprocessor">#include <QtCore/qmath.h></span>
<span class="keyword">class</span> TriangleWindow : <span class="keyword">public</span> OpenGLWindow
{
<span class="keyword">public</span>:
TriangleWindow();
<span class="type">void</span> initialize() override;
<span class="type">void</span> render() override;
<span class="keyword">private</span>:
GLuint m_posAttr;
GLuint m_colAttr;
GLuint m_matrixUniform;
<span class="type"><a href="qopenglshaderprogram.html">QOpenGLShaderProgram</a></span> <span class="operator">*</span>m_program;
<span class="type">int</span> m_frame;
};
TriangleWindow<span class="operator">::</span>TriangleWindow()
: m_program(<span class="number">0</span>)
<span class="operator">,</span> m_frame(<span class="number">0</span>)
{
}
<span class="type">int</span> main(<span class="type">int</span> argc<span class="operator">,</span> <span class="type">char</span> <span class="operator">*</span><span class="operator">*</span>argv)
{
<span class="type"><a href="qguiapplication.html">QGuiApplication</a></span> app(argc<span class="operator">,</span> argv);
<span class="type"><a href="qsurfaceformat.html">QSurfaceFormat</a></span> format;
format<span class="operator">.</span>setSamples(<span class="number">16</span>);
TriangleWindow window;
window<span class="operator">.</span>setFormat(format);
window<span class="operator">.</span>resize(<span class="number">640</span><span class="operator">,</span> <span class="number">480</span>);
window<span class="operator">.</span>show();
window<span class="operator">.</span>setAnimating(<span class="keyword">true</span>);
<span class="keyword">return</span> app<span class="operator">.</span>exec();
}
<span class="keyword">static</span> <span class="keyword">const</span> <span class="type">char</span> <span class="operator">*</span>vertexShaderSource <span class="operator">=</span>
<span class="string">"attribute highp vec4 posAttr;\n"</span>
<span class="string">"attribute lowp vec4 colAttr;\n"</span>
<span class="string">"varying lowp vec4 col;\n"</span>
<span class="string">"uniform highp mat4 matrix;\n"</span>
<span class="string">"void main() {\n"</span>
<span class="string">" col = colAttr;\n"</span>
<span class="string">" gl_Position = matrix * posAttr;\n"</span>
<span class="string">"}\n"</span>;
<span class="keyword">static</span> <span class="keyword">const</span> <span class="type">char</span> <span class="operator">*</span>fragmentShaderSource <span class="operator">=</span>
<span class="string">"varying lowp vec4 col;\n"</span>
<span class="string">"void main() {\n"</span>
<span class="string">" gl_FragColor = col;\n"</span>
<span class="string">"}\n"</span>;
<span class="type">void</span> TriangleWindow<span class="operator">::</span>initialize()
{
m_program <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qopenglshaderprogram.html">QOpenGLShaderProgram</a></span>(<span class="keyword">this</span>);
m_program<span class="operator">-</span><span class="operator">></span>addShaderFromSourceCode(<span class="type"><a href="qopenglshader.html">QOpenGLShader</a></span><span class="operator">::</span>Vertex<span class="operator">,</span> vertexShaderSource);
m_program<span class="operator">-</span><span class="operator">></span>addShaderFromSourceCode(<span class="type"><a href="qopenglshader.html">QOpenGLShader</a></span><span class="operator">::</span>Fragment<span class="operator">,</span> fragmentShaderSource);
m_program<span class="operator">-</span><span class="operator">></span>link();
m_posAttr <span class="operator">=</span> m_program<span class="operator">-</span><span class="operator">></span>attributeLocation(<span class="string">"posAttr"</span>);
m_colAttr <span class="operator">=</span> m_program<span class="operator">-</span><span class="operator">></span>attributeLocation(<span class="string">"colAttr"</span>);
m_matrixUniform <span class="operator">=</span> m_program<span class="operator">-</span><span class="operator">></span>uniformLocation(<span class="string">"matrix"</span>);
}
<span class="type">void</span> TriangleWindow<span class="operator">::</span>render()
{
<span class="keyword">const</span> <span class="type"><a href="../qtcore/qtglobal.html#qreal-typedef">qreal</a></span> retinaScale <span class="operator">=</span> devicePixelRatio();
glViewport(<span class="number">0</span><span class="operator">,</span> <span class="number">0</span><span class="operator">,</span> width() <span class="operator">*</span> retinaScale<span class="operator">,</span> height() <span class="operator">*</span> retinaScale);
glClear(GL_COLOR_BUFFER_BIT);
m_program<span class="operator">-</span><span class="operator">></span>bind();
QMatrix4x4 matrix;
matrix<span class="operator">.</span>perspective(<span class="number">60.0f</span><span class="operator">,</span> <span class="number">4.0f</span><span class="operator">/</span><span class="number">3.0f</span><span class="operator">,</span> <span class="number">0.1f</span><span class="operator">,</span> <span class="number">100.0f</span>);
matrix<span class="operator">.</span>translate(<span class="number">0</span><span class="operator">,</span> <span class="number">0</span><span class="operator">,</span> <span class="operator">-</span><span class="number">2</span>);
matrix<span class="operator">.</span>rotate(<span class="number">100.0f</span> <span class="operator">*</span> m_frame <span class="operator">/</span> screen()<span class="operator">-</span><span class="operator">></span>refreshRate()<span class="operator">,</span> <span class="number">0</span><span class="operator">,</span> <span class="number">1</span><span class="operator">,</span> <span class="number">0</span>);
m_program<span class="operator">-</span><span class="operator">></span>setUniformValue(m_matrixUniform<span class="operator">,</span> matrix);
GLfloat vertices<span class="operator">[</span><span class="operator">]</span> <span class="operator">=</span> {
<span class="number">0.0f</span><span class="operator">,</span> <span class="number">0.707f</span><span class="operator">,</span>
<span class="operator">-</span><span class="number">0.5f</span><span class="operator">,</span> <span class="operator">-</span><span class="number">0.5f</span><span class="operator">,</span>
<span class="number">0.5f</span><span class="operator">,</span> <span class="operator">-</span><span class="number">0.5f</span>
};
GLfloat colors<span class="operator">[</span><span class="operator">]</span> <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><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><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>
};
glVertexAttribPointer(m_posAttr<span class="operator">,</span> <span class="number">2</span><span class="operator">,</span> GL_FLOAT<span class="operator">,</span> GL_FALSE<span class="operator">,</span> <span class="number">0</span><span class="operator">,</span> vertices);
glVertexAttribPointer(m_colAttr<span class="operator">,</span> <span class="number">3</span><span class="operator">,</span> GL_FLOAT<span class="operator">,</span> GL_FALSE<span class="operator">,</span> <span class="number">0</span><span class="operator">,</span> colors);
glEnableVertexAttribArray(<span class="number">0</span>);
glEnableVertexAttribArray(<span class="number">1</span>);
glDrawArrays(GL_TRIANGLES<span class="operator">,</span> <span class="number">0</span><span class="operator">,</span> <span class="number">3</span>);
glDisableVertexAttribArray(<span class="number">1</span>);
glDisableVertexAttribArray(<span class="number">0</span>);
m_program<span class="operator">-</span><span class="operator">></span>release();
<span class="operator">+</span><span class="operator">+</span>m_frame;
}
</pre>
</div>
<!-- @@@openglwindow/main.cpp -->
</div>
</div>
</div>
</div>
</div>
<div class="footer">
<p>
<acronym title="Copyright">©</acronym> 2017 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>
distrib
>
Mageia
>
6
>
armv5tl
>
media
>
core-updates
>
by-pkgid
>
768f7d9f703884aa2562bf0a651086df
>
files
>
1688
