<?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>noisynode.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-scenegraph-graph-example.html">Scene Graph - Graph</a></td><td >noisynode.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">noisynode.cpp Example File</h1> <span class="subtitle">scenegraph/graph/noisynode.cpp</span> <!-- $$$scenegraph/graph/noisynode.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 "noisynode.h"</span> <span class="preprocessor">#include <QtCore/QRandomGenerator></span> <span class="preprocessor">#include <QtQuick/QSGSimpleMaterialShader></span> <span class="preprocessor">#include <QtQuick/QSGTexture></span> <span class="preprocessor">#include <QtQuick/QQuickWindow></span> <span class="preprocessor">#define NOISE_SIZE 64</span> <span class="keyword">struct</span> NoisyMaterial { <span class="operator">~</span>NoisyMaterial() { <span class="keyword">delete</span> texture; } <span class="type">QColor</span> color; <span class="type"><a href="qsgtexture.html">QSGTexture</a></span> <span class="operator">*</span>texture; }; <span class="keyword">class</span> NoisyShader : <span class="keyword">public</span> <span class="type"><a href="qsgsimplematerialshader.html">QSGSimpleMaterialShader</a></span><span class="operator"><</span>NoisyMaterial<span class="operator">></span> { QSG_DECLARE_SIMPLE_SHADER(NoisyShader<span class="operator">,</span> NoisyMaterial) <span class="keyword">public</span>: NoisyShader() { setShaderSourceFile(<span class="type">QOpenGLShader</span><span class="operator">::</span>Vertex<span class="operator">,</span> <span class="string">":/scenegraph/graph/shaders/noisy.vsh"</span>); setShaderSourceFile(<span class="type">QOpenGLShader</span><span class="operator">::</span>Fragment<span class="operator">,</span> <span class="string">":/scenegraph/graph/shaders/noisy.fsh"</span>); } <span class="type">QList</span><span class="operator"><</span><span class="type">QByteArray</span><span class="operator">></span> attributes() <span class="keyword">const</span> override { <span class="keyword">return</span> <span class="type">QList</span><span class="operator"><</span><span class="type">QByteArray</span><span class="operator">></span>() <span class="operator"><</span><span class="operator"><</span> <span class="string">"aVertex"</span> <span class="operator"><</span><span class="operator"><</span> <span class="string">"aTexCoord"</span>; } <span class="type">void</span> updateState(<span class="keyword">const</span> NoisyMaterial <span class="operator">*</span>m<span class="operator">,</span> <span class="keyword">const</span> NoisyMaterial <span class="operator">*</span>) override { <span class="comment">// Set the color</span> program()<span class="operator">-</span><span class="operator">></span>setUniformValue(id_color<span class="operator">,</span> m<span class="operator">-</span><span class="operator">></span>color); <span class="comment">// Bind the texture and set program to use texture unit 0 (the default)</span> m<span class="operator">-</span><span class="operator">></span>texture<span class="operator">-</span><span class="operator">></span>bind(); <span class="comment">// Then set the texture size so we can adjust the texture coordinates accordingly in the</span> <span class="comment">// vertex shader..</span> <span class="type">QSize</span> s <span class="operator">=</span> m<span class="operator">-</span><span class="operator">></span>texture<span class="operator">-</span><span class="operator">></span>textureSize(); program()<span class="operator">-</span><span class="operator">></span>setUniformValue(id_textureSize<span class="operator">,</span> <span class="type">QSizeF</span>(<span class="number">1.0</span> <span class="operator">/</span> s<span class="operator">.</span>width()<span class="operator">,</span> <span class="number">1.0</span> <span class="operator">/</span> s<span class="operator">.</span>height())); } <span class="type">void</span> resolveUniforms() override { id_texture <span class="operator">=</span> program()<span class="operator">-</span><span class="operator">></span>uniformLocation(<span class="string">"texture"</span>); id_textureSize <span class="operator">=</span> program()<span class="operator">-</span><span class="operator">></span>uniformLocation(<span class="string">"textureSize"</span>); id_color <span class="operator">=</span> program()<span class="operator">-</span><span class="operator">></span>uniformLocation(<span class="string">"color"</span>); <span class="comment">// We will only use texture unit 0, so set it only once.</span> program()<span class="operator">-</span><span class="operator">></span>setUniformValue(id_texture<span class="operator">,</span> <span class="number">0</span>); } <span class="keyword">private</span>: <span class="type">int</span> id_color <span class="operator">=</span> <span class="operator">-</span><span class="number">1</span>; <span class="type">int</span> id_texture <span class="operator">=</span> <span class="operator">-</span><span class="number">1</span>; <span class="type">int</span> id_textureSize <span class="operator">=</span> <span class="operator">-</span><span class="number">1</span>; }; NoisyNode<span class="operator">::</span>NoisyNode(<span class="type"><a href="qquickwindow.html">QQuickWindow</a></span> <span class="operator">*</span>window) { <span class="comment">// Make some noise...</span> <span class="type">QImage</span> image(NOISE_SIZE<span class="operator">,</span> NOISE_SIZE<span class="operator">,</span> <span class="type">QImage</span><span class="operator">::</span>Format_RGB32); <span class="type">uint</span> <span class="operator">*</span>data <span class="operator">=</span> (<span class="type">uint</span> <span class="operator">*</span>) image<span class="operator">.</span>bits(); <span class="keyword">for</span> (<span class="type">int</span> i<span class="operator">=</span><span class="number">0</span>; i<span class="operator"><</span>NOISE_SIZE <span class="operator">*</span> NOISE_SIZE; <span class="operator">+</span><span class="operator">+</span>i) { <span class="type">uint</span> g <span class="operator">=</span> <span class="type">QRandomGenerator</span><span class="operator">::</span>global()<span class="operator">-</span><span class="operator">></span>bounded(<span class="number">0xff</span>); data<span class="operator">[</span>i<span class="operator">]</span> <span class="operator">=</span> <span class="number">0xff000000</span> <span class="operator">|</span> (g <span class="operator"><</span><span class="operator"><</span> <span class="number">16</span>) <span class="operator">|</span> (g <span class="operator"><</span><span class="operator"><</span> <span class="number">8</span>) <span class="operator">|</span> g; } <span class="type"><a href="qsgtexture.html">QSGTexture</a></span> <span class="operator">*</span>t <span class="operator">=</span> window<span class="operator">-</span><span class="operator">></span>createTextureFromImage(image); t<span class="operator">-</span><span class="operator">></span>setFiltering(<span class="type"><a href="qsgtexture.html">QSGTexture</a></span><span class="operator">::</span>Nearest); t<span class="operator">-</span><span class="operator">></span>setHorizontalWrapMode(<span class="type"><a href="qsgtexture.html">QSGTexture</a></span><span class="operator">::</span>Repeat); t<span class="operator">-</span><span class="operator">></span>setVerticalWrapMode(<span class="type"><a href="qsgtexture.html">QSGTexture</a></span><span class="operator">::</span>Repeat); <span class="type"><a href="qsgsimplematerial.html">QSGSimpleMaterial</a></span><span class="operator"><</span>NoisyMaterial<span class="operator">></span> <span class="operator">*</span>m <span class="operator">=</span> NoisyShader<span class="operator">::</span>createMaterial(); m<span class="operator">-</span><span class="operator">></span>state()<span class="operator">-</span><span class="operator">></span>texture <span class="operator">=</span> t; m<span class="operator">-</span><span class="operator">></span>state()<span class="operator">-</span><span class="operator">></span>color <span class="operator">=</span> <span class="type">QColor</span><span class="operator">::</span>fromRgbF(<span class="number">0.95</span><span class="operator">,</span> <span class="number">0.95</span><span class="operator">,</span> <span class="number">0.97</span>); m<span class="operator">-</span><span class="operator">></span>setFlag(<span class="type"><a href="qsgmaterial.html">QSGMaterial</a></span><span class="operator">::</span>Blending); setMaterial(m); setFlag(OwnsMaterial<span class="operator">,</span> <span class="keyword">true</span>); <span class="type"><a href="qsggeometry.html">QSGGeometry</a></span> <span class="operator">*</span>g <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qsggeometry.html">QSGGeometry</a></span>(<span class="type"><a href="qsggeometry.html">QSGGeometry</a></span><span class="operator">::</span>defaultAttributes_TexturedPoint2D()<span class="operator">,</span> <span class="number">4</span>); <span class="type"><a href="qsggeometry.html">QSGGeometry</a></span><span class="operator">::</span>updateTexturedRectGeometry(g<span class="operator">,</span> <span class="type">QRect</span>()<span class="operator">,</span> <span class="type">QRect</span>()); setGeometry(g); setFlag(OwnsGeometry<span class="operator">,</span> <span class="keyword">true</span>); } <span class="type">void</span> NoisyNode<span class="operator">::</span>setRect(<span class="keyword">const</span> <span class="type">QRectF</span> <span class="operator">&</span>bounds) { <span class="type"><a href="qsggeometry.html">QSGGeometry</a></span><span class="operator">::</span>updateTexturedRectGeometry(geometry()<span class="operator">,</span> bounds<span class="operator">,</span> <span class="type">QRectF</span>(<span class="number">0</span><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">1</span>)); markDirty(<span class="type"><a href="qsgnode.html">QSGNode</a></span><span class="operator">::</span>DirtyGeometry); } </pre> </div> <!-- @@@scenegraph/graph/noisynode.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>