<?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 id="glGetShaderSource">
    <refmeta>
	<refentrytitle>glGetShaderSource</refentrytitle>
	<manvolnum>3G</manvolnum>
    </refmeta>
    <refnamediv>
	<refname>glGetShaderSource</refname>
	<refpurpose>Returns the source code string from a shader object</refpurpose>
    </refnamediv>
    <refsynopsisdiv><title>C Specification</title>
	<funcsynopsis>
	    <funcprototype>
		<funcdef>void <function>glGetShaderSource</function></funcdef>
		<paramdef>GLuint <parameter>shader</parameter></paramdef>
		<paramdef>GLsizei <parameter>bufSize</parameter></paramdef>
		<paramdef>GLsizei *<parameter>length</parameter></paramdef>
		<paramdef>GLchar *<parameter>source</parameter></paramdef>
	    </funcprototype>
	</funcsynopsis>
    </refsynopsisdiv>
    <refsect1 id="parameters"><title>Parameters</title>
	<variablelist>
	    <varlistentry>
		<term><parameter>shader</parameter></term>
		<listitem>
		    <para>Specifies the shader object to be
		    queried.</para>
		</listitem>
	    </varlistentry>
	    <varlistentry>
		<term><parameter>bufSize</parameter></term>
		<listitem>
		    <para>Specifies the size of the character buffer for
		    storing the returned source code string.</para>
		</listitem>
	    </varlistentry>
	    <varlistentry>
		<term><parameter>length</parameter></term>
		<listitem>
		    <para>Returns the length of the string returned in
		    <parameter>source</parameter> (excluding the null
		    terminator).</para>
		</listitem>
	    </varlistentry>
	    <varlistentry>
		<term><parameter>source</parameter></term>
		<listitem>
		    <para>Specifies an array of characters that is used
		    to return the source code string.</para>
		</listitem>
	    </varlistentry>
	</variablelist>
    </refsect1>
    <refsect1 id="description"><title>Description</title>
	<para><function>glGetShaderSource</function> returns the
	concatenation of the source code strings from the shader object
	specified by <parameter>shader</parameter>. The source code
	strings for a shader object are the result of a previous call to
	<citerefentry><refentrytitle>glShaderSource</refentrytitle></citerefentry>.
	The string returned by the function will be null
	terminated.</para>

	<para><function>glGetShaderSource</function> returns in
	<parameter>source</parameter> as much of the source code string
	as it can, up to a maximum of <parameter>bufSize</parameter>
	characters. The number of characters actually returned,
	excluding the null termination character, is specified by
	<parameter>length</parameter>. If the length of the returned
	string is not required, a value of <constant>NULL</constant> can
	be passed in the <parameter>length</parameter> argument. The
	size of the buffer required to store the returned source code
	string can be obtained by calling
	<citerefentry><refentrytitle>glGetShader</refentrytitle></citerefentry>
	with the value
	<constant>GL_SHADER_SOURCE_LENGTH</constant>.</para>
    </refsect1>
    <refsect1 id="notes"><title>Notes</title>
	<para><function>glGetShaderSource</function> is available only
	if the GL version is 2.0 or greater.</para>
    </refsect1>
    <refsect1 id="errors"><title>Errors</title>
	<para><constant>GL_INVALID_VALUE</constant> is generated if
	<parameter>shader</parameter> is not a value generated by
	OpenGL.</para>

	<para><constant>GL_INVALID_OPERATION</constant> is generated if
	<parameter>shader</parameter> is not a shader object.</para>

	<para><constant>GL_INVALID_VALUE</constant> is generated if
	<parameter>bufSize</parameter> is less than 0.</para>

	<para><constant>GL_INVALID_OPERATION</constant> is generated if
	<function>glGetShaderSource</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>glGetShader</refentrytitle></citerefentry>
	with argument
	<constant>GL_SHADER_SOURCE_LENGTH</constant></para>

	<para><citerefentry><refentrytitle>glIsShader</refentrytitle></citerefentry></para>
    </refsect1>
    <refsect1 id="seealso"><title>See Also</title>
	<para><citerefentry><refentrytitle>glCreateShader</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>
