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<!DOCTYPE book PUBLIC "-//OASIS//DTD DocBook MathML Module V1.1b1//EN"
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<refentry id="glIsShader">
    <refmeta>
        <refentrytitle>glIsShader</refentrytitle>
        <manvolnum>3G</manvolnum>
    </refmeta>
    <refnamediv>
        <refname>glIsShader</refname>
        <refpurpose>Determines if a name corresponds to a shader object</refpurpose>
    </refnamediv>
    <refsynopsisdiv><title>C Specification</title>
        <funcsynopsis>
            <funcprototype>
                <funcdef>GLboolean <function>glIsShader</function></funcdef>
                <paramdef>GLuint <parameter>shader</parameter></paramdef>
            </funcprototype>
        </funcsynopsis>
    </refsynopsisdiv>
    <refsect1 id="parameters"><title>Parameters</title>
        <variablelist>
            <varlistentry>
                <term><parameter>shader</parameter></term>
                <listitem>
                    <para>Specifies a potential shader object.</para>
                </listitem>
            </varlistentry>
        </variablelist>
    </refsect1>
    <refsect1 id="description"><title>Description</title>
        <para><function>glIsShader</function> returns
        <constant>GL_TRUE</constant> if <parameter>shader</parameter> is
        the name of a shader object previously created with
        <citerefentry><refentrytitle>glCreateShader</refentrytitle></citerefentry>
        and not yet deleted with <citerefentry><refentrytitle>glDeleteShader</refentrytitle></citerefentry>.
        If <parameter>shader</parameter> is
        zero or a non-zero value that is not the name of a shader
        object, or if an error occurs, <function>glIsShader </function> returns
        <constant>GL_FALSE</constant>.</para>
    </refsect1>
    <refsect1 id="notes"><title>Notes</title>
        <para><function>glIsShader</function> is available only if the
        GL version is 2.0 or greater.</para>

        <para>No error is generated if <parameter>shader</parameter> is
        not a valid shader object name.</para>

        <para>A shader object marked for deletion with <citerefentry><refentrytitle>glDeleteShader</refentrytitle></citerefentry>
        but still attached to a program object is still considered
        a shader object and <function>glIsShader</function> will return <constant>GL_TRUE</constant>.</para>
    </refsect1>
    <refsect1 id="errors"><title>Errors</title>
        <para><constant>GL_INVALID_OPERATION</constant> is generated if
        <function>glIsShader</function> is executed between the
        execution of
        <citerefentry><refentrytitle>glBegin</refentrytitle></citerefentry>
        and the corresponding execution of
        <citerefentry><refentrytitle>glEnd</refentrytitle></citerefentry>.</para>
    </refsect1>
    <refsect1 id="associatedgets"><title>Associated Gets</title>
        <para><citerefentry><refentrytitle>glGetAttachedShaders</refentrytitle></citerefentry>
        with a valid program object</para>

        <para><citerefentry><refentrytitle>glGetShader</refentrytitle></citerefentry>
        with arguments <parameter>shader</parameter> and a parameter to
        be queried</para>

        <para><citerefentry><refentrytitle>glGetShaderInfoLog</refentrytitle></citerefentry>
        with argument <parameter>object</parameter></para>

        <para><citerefentry><refentrytitle>glGetShaderSource</refentrytitle></citerefentry>
        with argument <parameter>object</parameter></para>
    </refsect1>
    <refsect1 id="seealso"><title>See Also</title>
        <para><citerefentry><refentrytitle>glAttachShader</refentrytitle></citerefentry>,
        <citerefentry><refentrytitle>glCompileShader</refentrytitle></citerefentry>,
        <citerefentry><refentrytitle>glCreateShader</refentrytitle></citerefentry>,
        <citerefentry><refentrytitle>glDeleteShader</refentrytitle></citerefentry>,
        <citerefentry><refentrytitle>glDetachShader</refentrytitle></citerefentry>,
        <citerefentry><refentrytitle>glLinkProgram</refentrytitle></citerefentry>,
        <citerefentry><refentrytitle>glShaderSource</refentrytitle></citerefentry></para>
    </refsect1>
    <refsect1 id="Copyright"><title>Copyright</title>
        <para>
            Copyright <trademark class="copyright"></trademark> 2003-2005 3Dlabs Inc. Ltd.
            This material may be distributed subject to the terms and conditions set forth in
            the Open Publication License, v 1.0, 8 June 1999.
            <ulink url="http://opencontent.org/openpub/">http://opencontent.org/openpub/</ulink>.
        </para>
    </refsect1>
</refentry>