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OpenGL ES 1.0 and EGL 1.0 reference manual and man pages (written by
Claude Knaus, based on OpenGL SI man pages).

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook V4.2//EN" "DTD/docbook/docbookx.dtd">

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<refentry id="eglQueryContext">

  <refmeta>
    <refentrytitle>eglQueryContext</refentrytitle>
    <manvolnum>3G</manvolnum>
  </refmeta>

  <refnamediv>
    <refname>eglQueryContext</refname>
    <refpurpose>
      return <acronym>EGL</acronym> rendering context information
    </refpurpose>
  </refnamediv>

  <refsynopsisdiv>
    <title>C Specification</title>

    <funcsynopsis>
      <funcprototype>
        <funcdef>EGLBoolean <function>eglQueryContext</function></funcdef>
        <paramdef>EGLDisplay <parameter>display</parameter></paramdef>
        <paramdef>EGLContext <parameter>context</parameter></paramdef>
        <paramdef>EGLint <parameter>attribute</parameter></paramdef>
        <paramdef>EGLint * <parameter>value</parameter></paramdef>
      </funcprototype>
    </funcsynopsis>
  </refsynopsisdiv>

  <refsect1>
    <title>Parameters</title>

    <variablelist>
      <varlistentry>
        <term><parameter>display</parameter></term>
        <listitem>
          <para>
            Specifies the EGL display connection.
          </para>
        </listitem>
      </varlistentry>

      <varlistentry>
        <term><parameter>context</parameter></term>
        <listitem>
          <para>
            Specifies the EGL rendering context to query.
          </para>
        </listitem>
      </varlistentry>

      <varlistentry>
        <term><parameter>attribute</parameter></term>
        <listitem>
          <para>
            Specifies the EGL rendering context attribute to be returned.
          </para>
        </listitem>
      </varlistentry>

      <varlistentry>
        <term><parameter>value</parameter></term>
        <listitem>
          <para>
            Returns the requested value.
          </para>
        </listitem>
      </varlistentry>
    </variablelist>
  </refsect1>

  <refsect1>
    <title>Description</title>

    <para>
      <function>eglQueryContext</function> returns in
      <parameter>value</parameter> the value of
      <parameter>attribute</parameter> for <parameter>context</parameter>.
      <parameter>attribute</parameter> can be one of the following:
    </para>

    <variablelist>
      <varlistentry>
        <term><constant>EGL_CONFIG_ID</constant></term>
        <listitem><para>
          Returns the ID of the EGL frame buffer configuration with respect to
          which the context was created.
        </para></listitem>
      </varlistentry>
    </variablelist>
  </refsect1>

  <refsect1>
    <title>Errors</title>

    <para>
      <constant>EGL_FALSE</constant> is returned on failure,
      <constant>EGL_TRUE</constant> otherwise.
      <parameter>value</parameter> is not modified when
      <constant>EGL_FALSE</constant> is returned.
    </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_CONTEXT</constant> is generated if
      <parameter>context</parameter> is not an EGL rendering context.
    </para>

    <para>
      <constant>EGL_BAD_ATTRIBUTE</constant> is generated if
      <parameter>attribute</parameter> is not a valid context attribute.
    </para>
  </refsect1>

  <refsect1>
    <title>See Also</title>

    <para>
      <citerefentry><refentrytitle>eglCreateContext</refentrytitle></citerefentry>
    </para>
  </refsect1>

</refentry>