OGS-Main
/
ogs-site

<!DOCTYPE html>
<html>
    <meta charset="utf-8">
    <head>
        <style>
            #header
            {
                background: #2BA6E3;
                padding: 0.7em;
                text-align: left;
            }
            #header a
            {
                color: white;
                text-decoration: none;
                padding: 0.5em 1em 0.5em 1em;
            }

            #lang
            {
                float: right;
            }

            .news_item
            {
                background: #FFFFFF;
                width: 720px;
                padding: 1em;
                margin-top: 2em;
                margin-bottom: 2em;
                border: 1px solid #E0E0E0;
                text-align: left;
            }
            .news_item_contents
            {
                color: #444;
                line-height: 1.5em;
            }
            .news_item_date
            {
                margin-bottom: 2em;
                color: #aaa;
            }

            html
            {
                font-family: sans-serif;
            }
            body
            {
                background: #FAFAFA;
            }
            code, pre
            {
                font-family: monospace, serif;
                font-size: 1em;
                color: #7f0a0c;
            }
            img
            {
                width: 720px;
            }
            a
            {
                color: #3A91CB;
            }

            table
            {
                border-collapse: collapse;
            }
            table, th, td
            {
                border: 1px solid #aaa;
                padding: 0.5em;
                margin-top: 0.5em;
                margin-bottom: 0.5em;
            }
        </style>
    </head>
    <body>
        <div id="header">
            <strong id="title">Open Game Studio</strong>
            <a href="../../en/news/index.html">News</a>
            <a href="../../en/game/index.html">Games</a>
            <a href="../../en/tool/index.html">Tools</a>
            <a href="../../en/page/about.html">About</a>
            <div id="lang">
                <a href="../../en/news/osg-sample.html">EN</a>
                <a href="../../ru/news/osg-sample.html">RU</a>
            </div>
        </div>
        <center>
            <h1>In the news...</h1>
            <div class="news_item">
                <h2 class="news_item_title">
                    <a href="osg-sample.html">OpenSceneGraph sample</a>
                </h2>
                <p class="news_item_date">
                    2017-05-12 00:00
                </p>
                <div class="news_item_contents">
<p><img src="../../images/2017-05_osg-sample.png" alt="Rocket in the distance" /></p>
<p>This article describes creation of the tutorials for building sample OpenSceneGraph application under Linux, macOS, Windows, and Android in April 2017.</p>
<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>
<p>The application is very basic and has the following features:</p>
<ol>
<li>Render window creation</li>
<li>Model loading</li>
<li>Model rendering with simple GLSL shaders</li>
<li>Model motion with a mouse under Linux, macOS, Windows and a finger under Android</li>
</ol>
<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>
<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>
<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>
<p>Here's a quick rundown of the files:</p>
<ol>
<li>GLES2 surface</li>
<li>Render activity to render to the surface</li>
<li>Native library Java interface</li>
<li>Native library C++ implementation</li>
<li>CMake file to build native library</li>
<li>Render activity layout</li>
<li>Model to display</li>
</ol>
<p>Here's a quick rundown of the project changes:</p>
<ol>
<li>Update Android manifest to use GLES2 and render activity</li>
<li>Reference native library's CMake file in the project's CMake file</li>
</ol>
<p>OpenSceneGraph documentation suggests building OpenSceneGraph outside Android Studio with CMake. However, this approach has the following limitations:</p>
<ol>
<li>You have to build OpenSceneGraph for each target architecture</li>
<li>You have to manually copy/reference built OpenSceneGraph libraries into Android Studio project</li>
</ol>
<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>
<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>
                </div>
            </div>
            <div id="footer">
                The site has been generated by <a href="http://opengamestudio.org/pskov">PSKOV</a>
                from <a href="http://github.com/ogstudio/site-opengamestudio">this source code</a>.
                The site is hosted by <a href="https://pages.github.com">GitHub Pages</a>.
            </div>
        </center>
    </body>
</html>