xref: /third_party/EGL/sdk/docs/man/docbook4/eglQueryString.xml (revision 02f4aeb0)

<?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="eglQueryString">
    <refentryinfo>
         <copyright>
             <year>2003-2014</year>
             <holder>The Khronos Group Inc.</holder>
         </copyright>
    </refentryinfo>
    <refmeta>
        <refentrytitle>eglQueryString</refentrytitle>
        <manvolnum>3G</manvolnum>
    </refmeta>
    <refnamediv>
        <refname>eglQueryString</refname>
        <refpurpose>
            return a string describing an <acronym>EGL</acronym> display connection
        </refpurpose>
    </refnamediv>
    <refsynopsisdiv>
        <title>C Specification</title>
        <funcsynopsis>
            <funcprototype>
                <funcdef>char const * <function>eglQueryString</function></funcdef>
                <paramdef>EGLDisplay <parameter>display</parameter></paramdef>
                <paramdef>EGLint <parameter>name</parameter></paramdef>
            </funcprototype>
        </funcsynopsis>
    </refsynopsisdiv>
    <refsect1 id="parameters"><title>Parameters</title>
        <variablelist>
            <varlistentry>
                <term><parameter>display</parameter></term>
                <listitem>
                    <para>
                        Specifies the EGL display connection.
                    </para>
                </listitem>
            </varlistentry>
            <varlistentry>
                <term><parameter>name</parameter></term>
                <listitem>
                    <para>
                        Specifies a symbolic constant, one of
                        <constant>EGL_CLIENT_APIS</constant>,
                        <constant>EGL_VENDOR</constant>,
                        <constant>EGL_VERSION</constant>, or
                        <constant>EGL_EXTENSIONS</constant>.
                    </para>
                </listitem>
            </varlistentry>
        </variablelist>
    </refsect1>
    <refsect1 id="description"><title>Description</title>
        <para>
            <function>eglQueryString</function> returns a pointer to a
            static string describing an EGL display connection.
            <parameter>name</parameter> can be one of the following:
        </para>
        <variablelist>
            <varlistentry>
                <term><constant>EGL_CLIENT_APIS</constant></term>
                <listitem><para>
                    Returns a string describing which client rendering
                    APIs are supported. The string contains a
                    space-separate list of API names. The list must
                    include at least one of <code>OpenGL</code>,
                    <code>OpenGL_ES</code>, or <code>OpenVG</code>.
                    These strings correspond respectively to values
                    <constant>EGL_OPENGL_API</constant>,
                    <constant>EGL_OPENGL_ES_API</constant>, and
                    <constant>EGL_OPENVG_API</constant> of the
                    <citerefentry><refentrytitle>eglBindAPI</refentrytitle></citerefentry>,
                    <parameter>api</parameter> argument.
                </para></listitem>
            </varlistentry>
            <varlistentry>
                <term><constant>EGL_VENDOR</constant></term>
                <listitem><para>
                    Returns the company responsible for this EGL implementation. This
                    name does not change from release to release.
                </para></listitem>
            </varlistentry>
            <varlistentry>
                <term><constant>EGL_VERSION</constant></term>
                <listitem><para>
                    Returns a version or release number.
                    The <constant>EGL_VERSION</constant> string is laid out as
                    follows:</para>
                <para>
                    <replaceable>major_version</replaceable>.<replaceable>minor_version</replaceable>
                    space
                    <replaceable>vendor_specific_info</replaceable>
                </para></listitem>
            </varlistentry>
            <varlistentry>
                <term><constant>EGL_EXTENSIONS</constant></term>
                <listitem><para>
                    Returns a space separated list of supported extensions to EGL.
                </para></listitem>
            </varlistentry>
        </variablelist>
    </refsect1>
    <refsect1 id="notes"><title>Notes</title>
        <para>
            <constant>EGL_CLIENT_APIS</constant> is supported only if
            the EGL version is 1.2 or greater.
        </para>
    </refsect1>
    <refsect1 id="errors"><title>Errors</title>
        <para>
            <constant>NULL</constant> is returned on failure.
        </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_PARAMETER</constant> is generated if
            <parameter>name</parameter> is not an accepted value.
        </para>
    </refsect1>
    <refsect1 id="seealso"><title>See Also</title>
        <para>
            <citerefentry><refentrytitle>eglBindAPI</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>