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<title>GLContext (LWJGL API)</title>
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<div class="subTitle">org.lwjgl.opengles</div>
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<h2 title="Class GLContext" class="title">Class GLContext</h2>
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<li>java.lang.Object</li>
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<li>org.lwjgl.opengles.GLContext</li>
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<pre>public final class <span class="strong">GLContext</span>
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extends java.lang.Object</pre>
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<div class="block"><p/>
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Manages GL contexts. Before any rendering is done by a LWJGL system, a call should be made to GLContext.useContext() with a
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context. This will ensure that GLContext has an accurate reflection of the current context's capabilities and function
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pointers.
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<p/>
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This class is thread-safe in the sense that multiple threads can safely call all public methods. The class is also
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thread-aware in the sense that it tracks a per-thread current context (including capabilities and function pointers).
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That way, multiple threads can have multiple contexts current and render to them concurrently.</div>
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<dl><dt><span class="strong">Version:</span></dt>
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<dd>$Revision: 3279 $
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$Id: GLContext.java 3279 2010-03-11 21:06:49Z spasi $</dd>
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<dt><span class="strong">Author:</span></dt>
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<dd>elias_naur <elias_naur@users.sourceforge.net></dd></dl>
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<th class="colOne" scope="col">Constructor and Description</th>
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<td class="colOne"><code><strong><a href="../../../org/lwjgl/opengles/GLContext.html#GLContext()">GLContext</a></strong>()</code> </td>
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<th class="colFirst" scope="col">Modifier and Type</th>
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<th class="colLast" scope="col">Method and Description</th>
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<td class="colFirst"><code>static <a href="../../../org/lwjgl/opengles/ContextCapabilities.html" title="class in org.lwjgl.opengles">ContextCapabilities</a></code></td>
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<td class="colLast"><code><strong><a href="../../../org/lwjgl/opengles/GLContext.html#getCapabilities()">getCapabilities</a></strong>()</code>
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<div class="block">Get the current capabilities instance.</div>
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<td class="colFirst"><code>static void</code></td>
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<td class="colLast"><code><strong><a href="../../../org/lwjgl/opengles/GLContext.html#loadOpenGLLibrary()">loadOpenGLLibrary</a></strong>()</code>
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<div class="block">If the OpenGL reference count is 0, the library is loaded.</div>
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<td class="colFirst"><code>static void</code></td>
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<td class="colLast"><code><strong><a href="../../../org/lwjgl/opengles/GLContext.html#unloadOpenGLLibrary()">unloadOpenGLLibrary</a></strong>()</code>
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<div class="block">The OpenGL library reference count is decremented, and if it reaches 0, the library is unloaded.</div>
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</td>
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<tr class="rowColor">
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<td class="colFirst"><code>static void</code></td>
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<td class="colLast"><code><strong><a href="../../../org/lwjgl/opengles/GLContext.html#useContext(java.lang.Object)">useContext</a></strong>(java.lang.Object context)</code>
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<div class="block">Makes a GL context the current LWJGL context by loading GL function pointers.</div>
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<code>clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait</code></li>
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<h4>GLContext</h4>
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<pre>public GLContext()</pre>
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<h4>getCapabilities</h4>
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<pre>public static <a href="../../../org/lwjgl/opengles/ContextCapabilities.html" title="class in org.lwjgl.opengles">ContextCapabilities</a> getCapabilities()</pre>
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<div class="block">Get the current capabilities instance. It contains the flags used
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to test for support of a particular extension.</div>
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<dl><dt><span class="strong">Returns:</span></dt><dd>The current capabilities instance.</dd></dl>
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</li>
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</ul>
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<a name="useContext(java.lang.Object)">
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<h4>useContext</h4>
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<pre>public static void useContext(java.lang.Object context)
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throws <a href="../../../org/lwjgl/LWJGLException.html" title="class in org.lwjgl">LWJGLException</a></pre>
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<div class="block">Makes a GL context the current LWJGL context by loading GL function pointers. The context must be current before a call to
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this method! Instead it simply ensures that the current context is reflected accurately by GLContext's extension caps and
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function pointers. Use useContext(null) when no context is active. <p>If the context is the same as last time, then this is
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a no-op. <p>If the context has not been encountered before it will be fully initialized from scratch. Otherwise a cached set
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of caps and function pointers will be used. <p>The reference to the context is held in a weak reference; therefore if no
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strong reference exists to the GL context it will automatically be forgotten by the VM at an indeterminate point in the
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future, freeing up a little RAM.</div>
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<dl><dt><span class="strong">Parameters:</span></dt><dd><code>context</code> - The context object, which uniquely identifies a GL context. If context is null, the native stubs are
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unloaded.</dd>
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<dt><span class="strong">Throws:</span></dt>
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<dd><code><a href="../../../org/lwjgl/LWJGLException.html" title="class in org.lwjgl">LWJGLException</a></code> - if context non-null, and the gl library can't be loaded or the basic GL11 functions can't be loaded</dd></dl>
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<h4>loadOpenGLLibrary</h4>
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<pre>public static void loadOpenGLLibrary()
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throws <a href="../../../org/lwjgl/LWJGLException.html" title="class in org.lwjgl">LWJGLException</a></pre>
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<div class="block">If the OpenGL reference count is 0, the library is loaded. The reference count is then incremented.</div>
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<dl><dt><span class="strong">Throws:</span></dt>
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<dd><code><a href="../../../org/lwjgl/LWJGLException.html" title="class in org.lwjgl">LWJGLException</a></code></dd></dl>
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<h4>unloadOpenGLLibrary</h4>
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<pre>public static void unloadOpenGLLibrary()</pre>
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<div class="block">The OpenGL library reference count is decremented, and if it reaches 0, the library is unloaded.</div>
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