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131 lines
6.1 KiB
XML
131 lines
6.1 KiB
XML
<?xml version="1.0" encoding="UTF-8"?>
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<!DOCTYPE book PUBLIC "-//OASIS//DTD DocBook MathML Module V1.1b1//EN"
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"http://www.oasis-open.org/docbook/xml/mathml/1.1CR1/dbmathml.dtd">
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<refentry id="glGetActiveSubroutineName">
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<refmeta>
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<refmetainfo>
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<copyright>
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<year>2010</year>
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<holder>Khronos Group.</holder>
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</copyright>
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</refmetainfo>
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<refentrytitle>glGetActiveSubroutineName</refentrytitle>
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<manvolnum>3G</manvolnum>
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</refmeta>
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<refnamediv>
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<refname>glGetActiveSubroutineName</refname>
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<refpurpose>query the name of an active shader subroutine</refpurpose>
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</refnamediv>
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<refsynopsisdiv><title>C Specification</title>
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<funcsynopsis>
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<funcprototype>
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<funcdef>void <function>glGetActiveSubroutineName</function></funcdef>
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<paramdef>GLuint <parameter>program</parameter></paramdef>
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<paramdef>GLenum <parameter>shadertype</parameter></paramdef>
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<paramdef>GLuint <parameter>index</parameter></paramdef>
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<paramdef>GLsizei <parameter>bufsize</parameter></paramdef>
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<paramdef>GLsizei *<parameter>length</parameter></paramdef>
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<paramdef>GLchar *<parameter>name</parameter></paramdef>
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</funcprototype>
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</funcsynopsis>
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</refsynopsisdiv>
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<!-- eqn: ignoring delim $$ -->
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<refsect1 id="parameters"><title>Parameters</title>
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<variablelist>
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<varlistentry>
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<term><parameter>program</parameter></term>
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<listitem>
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<para>
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Specifies the name of the program containing the subroutine.
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><parameter>shadertype</parameter></term>
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<listitem>
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<para>
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Specifies the shader stage from which to query the subroutine name.
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><parameter>index</parameter></term>
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<listitem>
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<para>
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Specifies the index of the shader subroutine uniform.
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><parameter>bufsize</parameter></term>
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<listitem>
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<para>
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Specifies the size of the buffer whose address is given in <parameter>name</parameter>.
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><parameter>length</parameter></term>
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<listitem>
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<para>
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Specifies the address of a variable which is to receive the length of the shader subroutine uniform name.
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><parameter>name</parameter></term>
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<listitem>
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<para>
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Specifies the address of an array into which the name of the shader subroutine uniform will be written.
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</para>
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</listitem>
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</varlistentry>
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</variablelist>
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</refsect1>
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<refsect1 id="description"><title>Description</title>
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<para>
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<function>glGetActiveSubroutineName</function> queries the name of an active shader subroutine uniform from the
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program object given in <parameter>program</parameter>. <parameter>index</parameter> specifies the index of
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the shader subroutine uniform within the shader stage given by <parameter>stage</parameter>, and must between
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zero and the value of <constant>GL_ACTIVE_SUBROUTINES</constant> minus one for the shader stage.
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</para>
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<para>
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The name of the selected subroutine is returned as a null-terminated string in <parameter>name</parameter>. The
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actual number of characters written into <parameter>name</parameter>, not including the null-terminator, is
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is returned in <parameter>length</parameter>. If <parameter>length</parameter> is <constant>NULL</constant>,
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no length is returned. The maximum number of characters that may be written into <parameter>name</parameter>,
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including the null-terminator, is given in <parameter>bufsize</parameter>.
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</para>
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</refsect1>
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<refsect1 id="errors"><title>Errors</title>
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<para>
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<constant>GL_INVALID_VALUE</constant> is generated if <parameter>index</parameter> is greater than or equal to
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the value of <constant>GL_ACTIVE_SUBROUTINES</constant>.
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</para>
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<para>
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<constant>GL_INVALID_VALUE</constant> is generated if <parameter>program</parameter> is not the name of an
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existing program object.
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</para>
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</refsect1>
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<refsect1 id="associatedgets"><title>Associated Gets</title>
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<para>
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<citerefentry><refentrytitle>glGetProgramStage</refentrytitle></citerefentry> with argument <constant>GL_ACTIVE_SUBROUTINE_UNIFORM_MAX_LENGTH</constant>
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</para>
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</refsect1>
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<refsect1 id="seealso"><title>See Also</title>
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<para>
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<citerefentry><refentrytitle>glGetSubroutineIndex</refentrytitle></citerefentry>,
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<citerefentry><refentrytitle>glGetActiveSubroutineUniform</refentrytitle></citerefentry>,
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<citerefentry><refentrytitle>glGetProgramStage</refentrytitle></citerefentry>
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</para>
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</refsect1>
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<refsect1 id="Copyright"><title>Copyright</title>
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<para>
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Copyright <trademark class="copyright"></trademark> 2010 Khronos Group.
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This material may be distributed subject to the terms and conditions set forth in
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the Open Publication License, v 1.0, 8 June 1999.
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<ulink url="http://opencontent.org/openpub/">http://opencontent.org/openpub/</ulink>.
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</para>
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</refsect1>
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</refentry>
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