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+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE book PUBLIC "-//OASIS//DTD DocBook MathML Module V1.1b1//EN"
+ "http://www.oasis-open.org/docbook/xml/mathml/1.1CR1/dbmathml.dtd">
+<refentry xml:base="" id="eglMakeCurrent">
+ <refentryinfo>
+ <copyright>
+ <year>2003-2014</year>
+ <holder>The Khronos Group Inc.</holder>
+ </copyright>
+ </refentryinfo>
+ <refmeta>
+ <refentrytitle>eglMakeCurrent</refentrytitle>
+ <manvolnum>3G</manvolnum>
+ </refmeta>
+ <refnamediv>
+ <refname>eglMakeCurrent</refname>
+ <refpurpose>
+ attach an EGL rendering context to EGL surfaces
+ </refpurpose>
+ </refnamediv>
+ <refsynopsisdiv>
+ <title>C Specification</title>
+ <funcsynopsis>
+ <funcprototype>
+ <funcdef>EGLBoolean <function>eglMakeCurrent</function></funcdef>
+ <paramdef>EGLDisplay <parameter>display</parameter></paramdef>
+ <paramdef>EGLSurface <parameter>draw</parameter></paramdef>
+ <paramdef>EGLSurface <parameter>read</parameter></paramdef>
+ <paramdef>EGLContext <parameter>context</parameter></paramdef>
+ </funcprototype>
+ </funcsynopsis>
+ </refsynopsisdiv>
+ <refsect1 id="parameters"><title>Parameters</title>
+ <variablelist>
+ <varlistentry>
+ <term><parameter>display</parameter></term>
+ <listitem>
+ <para>Specifies the <acronym>EGL</acronym> display connection.</para>
+ </listitem>
+ </varlistentry>
+ <varlistentry>
+ <term><parameter>draw</parameter></term>
+ <listitem>
+ <para>Specifies the <acronym>EGL</acronym> draw surface.</para>
+ </listitem>
+ </varlistentry>
+ <varlistentry>
+ <term><parameter>read</parameter></term>
+ <listitem>
+ <para>Specifies the <acronym>EGL</acronym> read surface.</para>
+ </listitem>
+ </varlistentry>
+ <varlistentry>
+ <term><parameter>context</parameter></term>
+ <listitem>
+ <para>Specifies the <acronym>EGL</acronym> rendering context
+ to be attached to the surfaces.
+ </para>
+ </listitem>
+ </varlistentry>
+ </variablelist>
+ </refsect1>
+ <refsect1 id="description"><title>Description</title>
+ <para>
+ <function>eglMakeCurrent</function> binds <parameter>context</parameter>
+ to the current rendering thread and to the <parameter>draw</parameter>
+ and <parameter>read</parameter> surfaces. <parameter>draw</parameter>
+ is used for all GL operations except for any pixel data read back
+ (<citerefentry><refentrytitle>glReadPixels</refentrytitle></citerefentry>,
+ <citerefentry><refentrytitle>glCopyTexImage2D</refentrytitle></citerefentry>, and
+ <citerefentry><refentrytitle>glCopyTexSubImage2D</refentrytitle></citerefentry>),
+ which is taken from the frame buffer values of
+ <parameter>read</parameter>.
+ </para>
+ <para>
+ If the calling thread has already a current rendering context, that
+ context is flushed and marked as no longer current.
+ </para>
+ <para>
+ The first time that <parameter>context</parameter> is made current,
+ the viewport and scissor dimensions are set to the size of the
+ <parameter>draw</parameter> surface. The viewport and
+ scissor are not modified when <parameter>context</parameter> is
+ subsequently made current.
+ </para>
+ <para>
+ To release the current context without assigning a new one, call
+ <function>eglMakeCurrent</function> with <parameter>draw</parameter>
+ and <parameter>read</parameter> set to
+ <constant>EGL_NO_SURFACE</constant> and <parameter>context</parameter>
+ set to <constant>EGL_NO_CONTEXT</constant>.
+ </para>
+ <para>
+ Use
+ <citerefentry><refentrytitle>eglGetCurrentContext</refentrytitle></citerefentry>,
+ <citerefentry><refentrytitle>eglGetCurrentDisplay</refentrytitle></citerefentry>, and
+ <citerefentry><refentrytitle>eglGetCurrentSurface</refentrytitle></citerefentry>
+ to query the current rendering context and associated display connection and surfaces.
+ </para>
+ </refsect1>
+ <refsect1 id="errors"><title>Errors</title>
+ <para>
+ <constant>EGL_FALSE</constant> is returned on failure,
+ <constant>EGL_TRUE</constant> otherwise. If <constant>EGL_FALSE</constant>
+ is returned, the previously current rendering context and
+ surfaces (if any) remain unchanged.
+ </para>
+ <para>
+ <constant>EGL_BAD_DISPLAY</constant> is generated if
+ <parameter>display</parameter> is not an EGL display connection.
+ </para>
+ <para>
+ <constant>EGL_NOT_INITIALIZED</constant> is generated if
+ <parameter>display</parameter> has not been initialized.
+ </para>
+ <para>
+ <constant>EGL_BAD_SURFACE</constant> is generated if
+ <parameter>draw</parameter> or <parameter>read</parameter> is not an
+ EGL surface.
+ </para>
+ <para>
+ <constant>EGL_BAD_CONTEXT</constant> is generated if
+ <parameter>context</parameter> is not an EGL rendering context.
+ </para>
+ <para>
+ <constant>EGL_BAD_MATCH</constant> is generated if
+ <parameter>draw</parameter> or
+ <parameter>read</parameter>
+ are not compatible with
+ <parameter>context</parameter>, or if
+ <parameter>context</parameter> is set to
+ <constant>EGL_NO_CONTEXT</constant> and
+ <parameter>draw</parameter> or
+ <parameter>read</parameter>
+ are not set to
+ <constant>EGL_NO_SURFACE</constant>, or if
+ <parameter>draw</parameter> or
+ <parameter>read</parameter> are set to
+ <constant>EGL_NO_SURFACE</constant> and
+ <parameter>context</parameter> is not set to
+ <constant>EGL_NO_CONTEXT</constant>.
+ </para>
+ <para>
+ <constant>EGL_BAD_ACCESS</constant> is generated if
+ <parameter>context</parameter>
+ is current to some other thread.
+ </para>
+ <para>
+ <constant>EGL_BAD_NATIVE_PIXMAP</constant> may be generated if
+ a native pixmap underlying either
+ <parameter>draw</parameter> or
+ <parameter>read</parameter>
+ is no longer valid.
+ </para>
+ <para>
+ <constant>EGL_BAD_NATIVE_WINDOW</constant> may be generated if
+ a native window underlying either
+ <parameter>draw</parameter> or
+ <parameter>read</parameter>
+ is no longer valid.
+ </para>
+ <para>
+ <constant>EGL_BAD_CURRENT_SURFACE</constant> is generated if
+ the previous context has unflushed commands and the previous surface
+ is no longer valid.
+ </para>
+ <para>
+ <constant>EGL_BAD_ALLOC</constant> may be generated if
+ allocation of ancillary buffers for <parameter>draw</parameter> or
+ <parameter>read</parameter> were delayed until
+ <function>eglMakeCurrent</function> is called, and there are not
+ enough resources to allocate them.
+ </para>
+ <para>
+ <constant>EGL_CONTEXT_LOST</constant> is generated if a power management
+ event has occurred. The application must destroy all contexts and
+ reinitialise OpenGL ES state and objects to continue rendering.
+ </para>
+ </refsect1>
+ <refsect1 id="seealso"><title>See Also</title>
+ <para>
+ <citerefentry><refentrytitle>glReadPixels</refentrytitle></citerefentry>,
+ <citerefentry><refentrytitle>glCopyTexImage2D</refentrytitle></citerefentry>,
+ <citerefentry><refentrytitle>glCopyTexSubImage2D</refentrytitle></citerefentry>,
+ <citerefentry><refentrytitle>eglCreateContext</refentrytitle></citerefentry>,
+ <citerefentry><refentrytitle>eglCreatePbufferSurface</refentrytitle></citerefentry>,
+ <citerefentry><refentrytitle>eglCreatePixmapSurface</refentrytitle></citerefentry>,
+ <citerefentry><refentrytitle>eglCreateWindowSurface</refentrytitle></citerefentry>,
+ <citerefentry><refentrytitle>eglGetCurrentContext</refentrytitle></citerefentry>,
+ <citerefentry><refentrytitle>eglGetCurrentDisplay</refentrytitle></citerefentry>,
+ <citerefentry><refentrytitle>eglGetCurrentSurface</refentrytitle></citerefentry>,
+ <citerefentry><refentrytitle>eglGetDisplay</refentrytitle></citerefentry>,
+ <citerefentry><refentrytitle>eglInitialize</refentrytitle></citerefentry>
+ </para>
+ </refsect1>
+ <refsect3 id="Copyright"><title></title>
+ <!-- Content included from copyright.inc.xsl -->
+ <imageobject>
+ <imagedata fileref="KhronosLogo.jpg" format="jpg" />
+ </imageobject>
+ <para />
+ </refsect3>
+</refentry>