153 lines
5.7 KiB
HTML
153 lines
5.7 KiB
HTML
<!DOCTYPE html>
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<html>
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<meta charset="utf-8">
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<head>
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<style>
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#header
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{
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background: #2BA6E3;
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padding: 0.7em;
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text-align: left;
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}
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#header a
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{
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color: white;
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text-decoration: none;
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padding: 0.5em 1em 0.5em 1em;
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}
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.news_item
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{
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background: #FFFFFF;
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width: 720px;
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padding: 1em;
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margin-top: 2em;
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margin-bottom: 2em;
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border: 1px solid #E0E0E0;
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text-align: left;
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}
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.news_item_contents
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{
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color: #444;
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line-height: 1.5em;
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}
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.news_item_date
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{
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margin-bottom: 2em;
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color: #aaa;
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}
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body
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{
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background: #FAFAFA;
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}
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code, pre
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{
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font-family: monospace, serif;
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font-size: 1em;
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color: #7f0a0c;
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}
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figure
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{
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margin: 0px;
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padding: 0px;
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}
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img
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{
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width: 720px;
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}
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html
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{
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font-family: sans-serif;
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}
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a
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{
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color: #3A91CB;
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text-decoration: none;
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}
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#lang
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{
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float: right;
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}
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figcaption
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{
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color: #aaa;
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}
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table
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{
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border-collapse: collapse;
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}
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table, th, td
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{
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border: 1px solid #aaa;
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padding: 0.5em;
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margin-top: 0.5em;
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margin-bottom: 0.5em;
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}
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</style>
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</head>
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<body>
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<center>
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<div id="header">
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<a href="../../en/news/index.html">News</a>
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<a href="../../en/page/games.html">Games</a>
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<a href="../../en/page/about.html">About</a>
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<div id="lang">
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<a href="osg-sample.html">EN</a>
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<a href="../../ru/news/osg-sample.html">RU</a>
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</div>
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</div>
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<h1>In the news</h1>
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<div class="news_item">
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<h2 class="news_item_title">
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<a href="osg-sample.html">OpenSceneGraph sample</a>
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</h2>
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<p class="news_item_date">
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2017-05-12 00:00
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</p>
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<div class="news_item_contents">
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<figure>
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<img src="../../images/2017-05_osg-sample.png" alt="Rocket in the distance" /><figcaption>Rocket in the distance</figcaption>
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</figure>
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<p>This article describes creation of the tutorials for building sample OpenSceneGraph application under Linux, macOS, Windows, and Android in April 2017.</p>
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<p>Previous tutorials described how to install OpenSceneGraph under Linux, macOS, Windows and render a model using the standard <strong>osgviewer</strong> tool. This time we worked on a <a href="https://github.com/OGStudio/openscenegraph-cross-platform-guide-application">sample OpenSceneGraph application</a> that would run under Linux, macOS, Windows, and Android.</p>
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<p>The application is very basic and has the following features:</p>
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<ol type="1">
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<li>Render window creation</li>
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<li>Model loading</li>
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<li>Model rendering with simple GLSL shaders</li>
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<li>Model motion with a mouse under Linux, macOS, Windows and a finger under Android</li>
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</ol>
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<p>Creating the tutorials for Linux, macOS, Windows was so easy and straightforward, that it only took us half a month. We spent the second half of the month creating Android tutorial.</p>
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<p>Our <a href="2016-october-recap.html">first successful Android build</a> last year included hacks and non-obvious steps to make OpenSceneGraph run under Android. This time we wanted a cleaner, faster, and cheaper approach.</p>
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<p>The approach we ended up with requires just a few files and a few changes to the original Android Studio project (with C++ support) to make sample OpenSceneGraph application run under Android.</p>
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<p>Here’s a quick rundown of the files:</p>
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<ol type="1">
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<li>GLES2 surface</li>
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<li>Render activity to render to the surface</li>
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<li>Native library Java interface</li>
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<li>Native library C++ implementation</li>
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<li>CMake file to build native library</li>
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<li>Render activity layout</li>
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<li>Model to display</li>
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</ol>
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<p>Here’s a quick rundown of the project changes:</p>
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<ol type="1">
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<li>Update Android manifest to use GLES2 and render activity</li>
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<li>Reference native library’s CMake file in the project’s CMake file</li>
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</ol>
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<p>OpenSceneGraph documentation suggests building OpenSceneGraph outside Android Studio with CMake. However, this approach has the following limitations:</p>
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<ol type="1">
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<li>You have to build OpenSceneGraph for each target architecture</li>
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<li>You have to manually copy/reference built OpenSceneGraph libraries into Android Studio project</li>
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</ol>
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<p>Our approach includes building OpenSceneGraph for those target architectures that Android Studio project is built for. Also, OpenSceneGraph is already referenced, so no extra work is required: you just need to rebuild the project, and you’re done.</p>
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<p>That’s it for describing the creation of the tutorials for building sample OpenSceneGraph application under Linux, macOS, Windows, and Android in April 2017.</p>
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</div>
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</div>
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</center>
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</body>
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</html>
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