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<!-- Generated by javadoc (build 1.6.0_26) on Tue Jul 28 10:50:13 BST 2015 -->
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GLContext (LWJGL API)
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org.lwjgl.opengles</FONT>
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Class GLContext</H2>
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<PRE>
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java.lang.Object
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<IMG SRC="../../../resources/inherit.gif" ALT="extended by "><B>org.lwjgl.opengles.GLContext</B>
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</PRE>
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<HR>
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<DL>
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<DT><PRE>public final class <B>GLContext</B><DT>extends java.lang.Object</DL>
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</PRE>
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<P>
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<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.
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<P>
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<P>
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<DL>
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<DT><B>Version:</B></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><B>Author:</B></DT>
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<DD>elias_naur <elias_naur@users.sourceforge.net></DD>
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<!-- ======== CONSTRUCTOR SUMMARY ======== -->
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<TD><CODE><B><A HREF="../../../org/lwjgl/opengles/GLContext.html#GLContext()">GLContext</A></B>()</CODE>
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<B>Method Summary</B></FONT></TH>
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<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
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<CODE>static <A HREF="../../../org/lwjgl/opengles/ContextCapabilities.html" title="class in org.lwjgl.opengles">ContextCapabilities</A></CODE></FONT></TD>
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<TD><CODE><B><A HREF="../../../org/lwjgl/opengles/GLContext.html#getCapabilities()">getCapabilities</A></B>()</CODE>
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<BR>
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Get the current capabilities instance.</TD>
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</TR>
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<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
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<CODE>static void</CODE></FONT></TD>
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<TD><CODE><B><A HREF="../../../org/lwjgl/opengles/GLContext.html#loadOpenGLLibrary()">loadOpenGLLibrary</A></B>()</CODE>
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<BR>
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If the OpenGL reference count is 0, the library is loaded.</TD>
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</TR>
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<TR BGCOLOR="white" CLASS="TableRowColor">
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<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
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<CODE>static void</CODE></FONT></TD>
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<TD><CODE><B><A HREF="../../../org/lwjgl/opengles/GLContext.html#unloadOpenGLLibrary()">unloadOpenGLLibrary</A></B>()</CODE>
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<BR>
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The OpenGL library reference count is decremented, and if it reaches 0, the library is unloaded.</TD>
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</TR>
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<TR BGCOLOR="white" CLASS="TableRowColor">
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<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
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<CODE>static void</CODE></FONT></TD>
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<TD><CODE><B><A HREF="../../../org/lwjgl/opengles/GLContext.html#useContext(java.lang.Object)">useContext</A></B>(java.lang.Object context)</CODE>
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<BR>
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Makes a GL context the current LWJGL context by loading GL function pointers.</TD>
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<A NAME="methods_inherited_from_class_java.lang.Object"><!-- --></A>
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<TH ALIGN="left"><B>Methods inherited from class java.lang.Object</B></TH>
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<TR BGCOLOR="white" CLASS="TableRowColor">
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<TD><CODE>clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait</CODE></TD>
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<P>
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<!-- ========= CONSTRUCTOR DETAIL ======== -->
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<B>Constructor Detail</B></FONT></TH>
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</TABLE>
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<A NAME="GLContext()"><!-- --></A><H3>
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GLContext</H3>
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<PRE>
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public <B>GLContext</B>()</PRE>
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<DL>
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</DL>
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<!-- ============ METHOD DETAIL ========== -->
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<A NAME="getCapabilities()"><!-- --></A><H3>
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getCapabilities</H3>
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<PRE>
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public static <A HREF="../../../org/lwjgl/opengles/ContextCapabilities.html" title="class in org.lwjgl.opengles">ContextCapabilities</A> <B>getCapabilities</B>()</PRE>
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<DL>
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<DD>Get the current capabilities instance. It contains the flags used
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to test for support of a particular extension.
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<P>
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<DD><DL>
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<DT><B>Returns:</B><DD>The current capabilities instance.</DL>
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</DD>
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</DL>
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<HR>
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<A NAME="useContext(java.lang.Object)"><!-- --></A><H3>
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useContext</H3>
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<PRE>
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public static void <B>useContext</B>(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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<DL>
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<DD>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.
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<P>
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<DD><DL>
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<DT><B>Parameters:</B><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.
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<DT><B>Throws:</B>
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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</DL>
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</DD>
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</DL>
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<HR>
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<A NAME="loadOpenGLLibrary()"><!-- --></A><H3>
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loadOpenGLLibrary</H3>
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<PRE>
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public static void <B>loadOpenGLLibrary</B>()
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throws <A HREF="../../../org/lwjgl/LWJGLException.html" title="class in org.lwjgl">LWJGLException</A></PRE>
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<DL>
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<DD>If the OpenGL reference count is 0, the library is loaded. The reference count is then incremented.
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<P>
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<DD><DL>
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<DT><B>Throws:</B>
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<DD><CODE><A HREF="../../../org/lwjgl/LWJGLException.html" title="class in org.lwjgl">LWJGLException</A></CODE></DL>
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</DD>
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<A NAME="unloadOpenGLLibrary()"><!-- --></A><H3>
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unloadOpenGLLibrary</H3>
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<PRE>
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public static void <B>unloadOpenGLLibrary</B>()</PRE>
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<DL>
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<DD>The OpenGL library reference count is decremented, and if it reaches 0, the library is unloaded.
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