1941df93b9
(cherry picked from commit 16e941b2a2d442492dc2368ec95d85a8cd6416f7) git-svn-id: https://svn.code.sf.net/p/freeglut/code/trunk@1807 7f0cb862-5218-0410-a997-914c9d46530a
102 lines
3.1 KiB
PHP
102 lines
3.1 KiB
PHP
<?php
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require("../template.php");
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# Now set the title of the page:
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setPageTitle("OpenGL ES");
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# Make the header.
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generateHeader($_SERVER['PHP_SELF']);
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?>
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<ul>
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<li><a name="#intro">Introduction</a></li>
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<li><a href="#compiling">Compiling</a></li>
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<li><a href="#using">Using in your projects</a></li>
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</ul>
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<a name="intro"></a>
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<h1>Introduction</h1>
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<p>freeglut can initialize an OpenGL ES (GLES) context. It works under platforms that supports EGL:</p>
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<ul>
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<li>Android (see <a href="android.php">dedicated page</a>)</li>
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<li>BlackBerry 10/BlackBerry PlayBook</li>
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<li>Unix X11 with Mesa EGL</li>
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<li>TODO: Raspberry PI: Mesa EGL doesn't work due to X11's fbdev limitation (no GL);
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it needs to use libraries from <tt>libraspeberrypi-dev</tt> which will shortcut X11
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[<a href="https://github.com/openframeworks/openFrameworks/blob/master/libs/openFrameworks/app/ofAppEGLWindow.cpp">1</a>]
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[<a href="http://sourceforge.net/p/freeglut/feature-requests/71/">2</a>]
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[<a href="https://github.com/raspberrypi/userland/">3</a>]
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</li>
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</ul>
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<p>freeglut ES is provided as a separate library, because OpenGL ES
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has a distinct library from plain OpenGL (<tt>-lGLESv1_CM
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-lGLESv2</tt> instead of <tt>-lGL</tt>, and different headers too).
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We could consider dynamically loading the OpenGL symbols we need,
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like <a href="http://libsdl.org/">libSDL</a>.</p>
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<p>It is possible to select OpenGL ES 1, 2 or 3 (if the device and
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driver supports it) by calling
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e.g. <code>glutInitContextVersion(3,0)</code> before creating a
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window.</p>
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<a name="compiling"></a>
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<h1>Compiling</h1>
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<p>The following explains how to use freeglut ES for Mesa EGL.<br />
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See also the <a href="android.php">Android page</a>.</p>
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<p>First, check <tt>README.cmake</tt> to install the dependencies for your system.</p>
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<p>Then:</p>
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<pre>
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apt-get install libgles1-mesa-dev libgles2-mesa-dev
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cd /usr/src/freeglut-3.0.0/
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mkdir native-gles/ && cd native-gles/
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cmake \
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-DCMAKE_INSTALL_PREFIX=/tmp/freeglut-native-gles \
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-D CMAKE_BUILD_TYPE=Debug \
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-DFREEGLUT_GLES=ON \
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-DFREEGLUT_BUILD_DEMOS=NO \
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..
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make -j4
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make install
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</pre>
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<a name="using"></a>
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<h1>Using in your projects</h1>
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<p>Get the 'freeglut-gles' module through pkg-config.</p>
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<p>If you use CMake, you can do that with:</p>
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<pre>
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include(FindPkgConfig)
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pkg_check_modules(freeglut REQUIRED freeglut-gles>=3.0.0)
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if(freeglut_FOUND)
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include_directories(${freeglut_STATIC_INCLUDE_DIRS})
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link_directories(${freeglut_STATIC_LIBRARY_DIRS})
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set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} ${freeglut_STATIC_CFLAGS_OTHER}")
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add_definitions(${freeglut_STATIC_CFLAGS_OTHER})
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endif()
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</pre>
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<pre>
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cd your_project/
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mkdir native-gles/ && cd native-gles/
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PKG_CONFIG_PATH=/tmp/freeglut-native-gles/share/pkgconfig/ cmake ..
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</pre>
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<p>Examples:</p>
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<ul>
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<li>OpenGL Wikibook's
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<a href="https://gitorious.org/wikibooks-opengl/modern-tutorials/source/HEAD:tut04_transform-gles2"><tt>tut04_transform-gles2</tt>
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example</a>: it uses a basic Makefile targeting <tt>freeglut-gles</tt></li>
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<li><tt>progs/test-shapes-gles1/</tt> in the source distribution:
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it is a standalone CMake app that uses freeglut GLES (v1).</li>
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</ul>
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<?php generateFooter(); ?>
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