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  80. <strong id="title">Open Game Studio</strong>
  81. <a href="../../en/news/index.html">News</a>
  82. <a href="../../en/game/index.html">Games</a>
  83. <a href="../../en/tool/index.html">Tools</a>
  84. <a href="../../en/page/about.html">About</a>
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  90. <center>
  91. <h1>In the news...</h1>
  92. <div class="news_item">
  93. <h2 class="news_item_title">
  94. <a href="osg-sample.html">OpenSceneGraph sample</a>
  95. </h2>
  96. <p class="news_item_date">
  97. 2017-05-12 00:00
  98. </p>
  99. <div class="news_item_contents">
  100. <p><img src="../../images/2017-05_osg-sample.png" alt="Rocket in the distance" /></p>
  101. <p>This article describes creation of the tutorials for building sample OpenSceneGraph application under Linux, macOS, Windows, and Android in April 2017.</p>
  102. <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>
  103. <p>The application is very basic and has the following features:</p>
  104. <ol>
  105. <li>Render window creation</li>
  106. <li>Model loading</li>
  107. <li>Model rendering with simple GLSL shaders</li>
  108. <li>Model motion with a mouse under Linux, macOS, Windows and a finger under Android</li>
  109. </ol>
  110. <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>
  111. <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>
  112. <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>
  113. <p>Here's a quick rundown of the files:</p>
  114. <ol>
  115. <li>GLES2 surface</li>
  116. <li>Render activity to render to the surface</li>
  117. <li>Native library Java interface</li>
  118. <li>Native library C++ implementation</li>
  119. <li>CMake file to build native library</li>
  120. <li>Render activity layout</li>
  121. <li>Model to display</li>
  122. </ol>
  123. <p>Here's a quick rundown of the project changes:</p>
  124. <ol>
  125. <li>Update Android manifest to use GLES2 and render activity</li>
  126. <li>Reference native library's CMake file in the project's CMake file</li>
  127. </ol>
  128. <p>OpenSceneGraph documentation suggests building OpenSceneGraph outside Android Studio with CMake. However, this approach has the following limitations:</p>
  129. <ol>
  130. <li>You have to build OpenSceneGraph for each target architecture</li>
  131. <li>You have to manually copy/reference built OpenSceneGraph libraries into Android Studio project</li>
  132. </ol>
  133. <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>
  134. <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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  138. The site has been generated by <a href="http://opengamestudio.org/pskov">PSKOV</a>
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