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<!DOCTYPE refentry [ <!ENTITY % mathent SYSTEM "math.ent"> %mathent; ]>
<!-- Converted by db4-upgrade version 1.1 -->
<refentry xmlns="http://docbook.org/ns/docbook" version="5.0" xml:id="glGetProgramResourceIndex">
<info>
<copyright>
<year>2013-2014</year>
<holder>Khronos Group</holder>
</copyright>
</info>
<refmeta>
<refentrytitle>glGetProgramResourceIndex</refentrytitle>
<manvolnum>3G</manvolnum>
</refmeta>
<refnamediv>
<refname>glGetProgramResourceIndex</refname>
<refpurpose>query the index of a named resource within a program</refpurpose>
</refnamediv>
<refsynopsisdiv><title>C Specification</title>
<funcsynopsis>
<funcprototype>
<funcdef>GLuint <function>glGetProgramResourceIndex</function></funcdef>
<paramdef>GLuint <parameter>program</parameter></paramdef>
<paramdef>GLenum <parameter>programInterface</parameter></paramdef>
<paramdef>const char * <parameter>name</parameter></paramdef>
</funcprototype>
</funcsynopsis>
</refsynopsisdiv>
<refsect1 xml:id="parameters"><title>Parameters</title>
<variablelist>
<varlistentry>
<term><parameter>program</parameter></term>
<listitem>
<para>
The name of a program object whose resources to query.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><parameter>programInterface</parameter></term>
<listitem>
<para>
A token identifying the interface within <parameter>program</parameter> containing the resource named <parameter>name</parameter>.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><parameter>name</parameter></term>
<listitem>
<para>
The name of the resource to query the index of.
</para>
</listitem>
</varlistentry>
</variablelist>
</refsect1>
<refsect1 xml:id="description"><title>Description</title>
<para>
<function>glGetProgramResourceIndex</function> returns the unsigned
integer index assigned to a resource named <parameter>name</parameter> in
the interface type <parameter>programInterface</parameter> of program object <parameter>program</parameter>.
</para>
<para>
<parameter>program</parameter> must be the name of an existing program object. <parameter>programInterface</parameter>
is the name of the interface within <parameter>program</parameter> which contains the resource named
<parameter>name</parameter>and must be one of the following
values:
</para>
<variablelist>
<varlistentry>
<term><constant>GL_UNIFORM</constant></term>
<listitem>
<para>
The query is targeted at the set of active uniforms within <parameter>program</parameter>.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><constant>GL_UNIFORM_BLOCK</constant></term>
<listitem>
<para>
The query is targeted at the set of active uniform blocks within <parameter>program</parameter>.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><constant>GL_PROGRAM_INPUT</constant></term>
<listitem>
<para>
The query is targeted at the set of active input variables used by the first shader stage of <parameter>program</parameter>.
If <parameter>program</parameter> contains multiple shader stages then input variables from any stage other than the first
will not be enumerated.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><constant>GL_PROGRAM_OUTPUT</constant></term>
<listitem>
<para>
The query is targeted at the set of active output variables produced by the last shader stage of <parameter>program</parameter>.
If <parameter>program</parameter> contains multiple shader stages then output variables from any stage other than the last
will not be enumerated.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><constant>GL_VERTEX_SUBROUTINE</constant></term>
<term><constant>GL_TESS_CONTROL_SUBROUTINE</constant></term>
<term><constant>GL_TESS_EVALUATION_SUBROUTINE</constant></term>
<term><constant>GL_GEOMETRY_SUBROUTINE</constant></term>
<term><constant>GL_FRAGMENT_SUBROUTINE</constant></term>
<term><constant>GL_COMPUTE_SUBROUTINE</constant></term>
<listitem>
<para>
The query is targeted at the set of active subroutines for the vertex, tessellation control, tessellation evaluation,
geometry, fragment and compute shader stages of <parameter>program</parameter>, respectively.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><constant>GL_VERTEX_SUBROUTINE_UNIFORM</constant></term>
<term><constant>GL_TESS_CONTROL_SUBROUTINE_UNIFORM</constant></term>
<term><constant>GL_TESS_EVALUATION_SUBROUTINE_UNIFORM</constant></term>
<term><constant>GL_GEOMETRY_SUBROUTINE_UNIFORM</constant></term>
<term><constant>GL_FRAGMENT_SUBROUTINE_UNIFORM</constant></term>
<term><constant>GL_COMPUTE_SUBROUTINE_UNIFORM</constant></term>
<listitem>
<para>
The query is targeted at the set of active subroutine uniform variables used by the vertex, tessellation control, tessellation evaluation,
geometry, fragment and compute shader stages of <parameter>program</parameter>, respectively.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><constant>GL_TRANSFORM_FEEDBACK_VARYING</constant></term>
<listitem>
<para>
The query is targeted at the set of output variables from the last non-fragment stage of <parameter>program</parameter> that would be
captured if transform feedback were active.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><constant>GL_TRANSFORM_FEEDBACK_BUFFER</constant></term>
<listitem>
<para>
The query is targeted at the set of active buffer binding points to which output variables in the
<constant>GL_TRANSFORM_FEEDBACK_VARYING</constant> interface are written.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><constant>GL_BUFFER_VARIABLE</constant></term>
<listitem>
<para>
The query is targeted at the set of active buffer variables used by <parameter>program</parameter>.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><constant>GL_SHADER_STORAGE_BLOCK</constant></term>
<listitem>
<para>
The query is targeted at the set of active shader storage blocks used by <parameter>program</parameter>.
</para>
</listitem>
</varlistentry>
</variablelist>
<para>
If <parameter>name</parameter> exactly matches the name string of one of the active resources
for <parameter>programInterface</parameter>, the index of the matched resource is returned.
Additionally, if <parameter>name</parameter> would exactly match the name string of an active
resource if "[0]" were appended to <parameter>name</parameter>, the index of the matched
resource is returned. Otherwise, <parameter>name</parameter> is considered not to be the name
of an active resource, and <constant>GL_INVALID_INDEX</constant> is returned.
</para>
<para>
For the interface <constant>GL_TRANSFORM_FEEDBACK_VARYING</constant>, the value <constant>GL_INVALID_INDEX</constant>
should be returned when querying the index assigned to the special names
<code>gl_NextBuffer</code>, <code>gl_SkipComponents1</code>, <code>gl_SkipComponents2</code>,
<code>gl_SkipComponents3</code>, or <code>gl_SkipComponents4</code>.
</para>
</refsect1>
<refsect1 xml:id="errors"><title>Errors</title>
<para>
<constant>GL_INVALID_ENUM</constant> is generated if <parameter>programInterface</parameter>
is not one of the accepted interface types.
</para>
<para>
<constant>GL_INVALID_ENUM</constant> is generated if <parameter>programInterface</parameter> is
<constant>GL_ATOMIC_COUNTER_BUFFER</constant> or <constant>GL_TRANSFORM_FEEDBACK_BUFFER</constant>, since active atomic
counter and transform feedback buffer resources are not assigned name strings.
</para>
<para>
Although not an error, <constant>GL_INVALID_INDEX</constant> is returned if <parameter>name</parameter>
is not the name of a resource within the interface identified by <parameter>programInterface</parameter>.
</para>
</refsect1>
<refsect1 xml:id="versions"><title>Version Support</title>
<informaltable>
<tgroup cols="13" align="left">
<xi:include xmlns:xi="http://www.w3.org/2001/XInclude" href="apifunchead.xml" xpointer="xpointer(/*/*)"/>
<tbody>
<row>
<entry><function>glGetProgramResourceIndex</function></entry>
<xi:include xmlns:xi="http://www.w3.org/2001/XInclude" href="apiversion.xml" xpointer="xpointer(/*/*[@role='43']/*)"/>
</row>
</tbody>
</tgroup>
</informaltable>
</refsect1>
<refsect1 xml:id="seealso"><title>See Also</title>
<para>
<citerefentry><refentrytitle>glGetProgramResourceName</refentrytitle></citerefentry>,
<citerefentry><refentrytitle>glGetProgramResource</refentrytitle></citerefentry>,
<citerefentry><refentrytitle>glGetProgramResourceLocation</refentrytitle></citerefentry>,
<citerefentry><refentrytitle>glGetProgramResourceLocationIndex</refentrytitle></citerefentry>.
</para>
</refsect1>
<refsect1 xml:id="Copyright"><title>Copyright</title>
<para>
Copyright <trademark class="copyright"/> 2013-2014 Khronos Group.
This material may be distributed subject to the terms and conditions set forth in
the Open Publication License, v 1.0, 8 June 1999.
<link xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="http://opencontent.org/openpub/">http://opencontent.org/openpub/</link>.
</para>
</refsect1>
</refentry>
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