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216 lines
11 KiB
XML
216 lines
11 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="glGetProgramResourceIndex">
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<refentryinfo>
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<copyright>
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<year>2013</year>
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<holder>Khronos Group</holder>
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</copyright>
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</refentryinfo>
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<refmeta>
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<refentrytitle>glGetProgramResourceIndex</refentrytitle>
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<manvolnum>3G</manvolnum>
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</refmeta>
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<refnamediv>
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<refname>glGetProgramResourceIndex</refname>
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<refpurpose>query the index of a named resource within a program</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>GLuint <function>glGetProgramResourceIndex</function></funcdef>
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<paramdef>GLuint <parameter>program</parameter></paramdef>
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<paramdef>GLenum <parameter>programInterface</parameter></paramdef>
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<paramdef>const char * <parameter>name</parameter></paramdef>
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</funcprototype>
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</funcsynopsis>
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</refsynopsisdiv>
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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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The name of a program object whose resources to query.
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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>programInterface</parameter></term>
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<listitem>
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<para>
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A token identifying the interface within <parameter>program</parameter> containing the resource named <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>name</parameter></term>
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<listitem>
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<para>
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The name of the resource to query the index of.
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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>glGetProgramResourceIndex</function> returns the unsigned
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integer index assigned to a resource named <parameter>name</parameter> in
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the interface type <parameter>programInterface</parameter> of program object <parameter>program</parameter>.
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</para>
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<para>
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<parameter>program</parameter> must be the name of an existing program object. <parameter>programInterface</parameter>
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is the name of the interface within <parameter>program</parameter> which contains the resource named
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<parameter>name</parameter>and must be one of the following
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values:
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</para>
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<variablelist>
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<varlistentry>
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<term><constant>GL_UNIFORM</constant></term>
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<listitem>
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<para>
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The query is targeted at the set of active uniforms within <parameter>program</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><constant>GL_UNIFORM_BLOCK</constant></term>
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<listitem>
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<para>
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The query is targeted at the set of active uniform blocks within <parameter>program</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><constant>GL_PROGRAM_INPUT</constant></term>
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<listitem>
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<para>
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The query is targeted at the set of active input variables used by the first shader stage of <parameter>program</parameter>.
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If <parameter>program</parameter> contains multiple shader stages then input variables from any stage other than the first
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will not be enumerated.
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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><constant>GL_PROGRAM_OUTPUT</constant></term>
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<listitem>
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<para>
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The query is targeted at the set of active output variables produced by the last shader stage of <parameter>program</parameter>.
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If <parameter>program</parameter> contains multiple shader stages then output variables from any stage other than the last
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will not be enumerated.
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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><constant>GL_VERTEX_SUBROUTINE</constant></term>
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<term><constant>GL_TESS_CONTROL_SUBROUTINE</constant></term>
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<term><constant>GL_TESS_EVALUATION_SUBROUTINE</constant></term>
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<term><constant>GL_GEOMETRY_SUBROUTINE</constant></term>
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<term><constant>GL_FRAGMENT_SUBROUTINE</constant></term>
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<term><constant>GL_COMPUTE_SUBROUTINE</constant></term>
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<listitem>
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<para>
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The query is targeted at the set of active subroutines for the vertex, tessellation control, tessellation evaluation,
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geometry, fragment and compute shader stages of <parameter>program</parameter>, respectively.
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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><constant>GL_VERTEX_SUBROUTINE_UNIFORM</constant></term>
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<term><constant>GL_TESS_CONTROL_SUBROUTINE_UNIFORM</constant></term>
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<term><constant>GL_TESS_EVALUATION_SUBROUTINE_UNIFORM</constant></term>
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<term><constant>GL_GEOMETRY_SUBROUTINE_UNIFORM</constant></term>
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<term><constant>GL_FRAGMENT_SUBROUTINE_UNIFORM</constant></term>
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<term><constant>GL_COMPUTE_SUBROUTINE_UNIFORM</constant></term>
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<listitem>
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<para>
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The query is targeted at the set of active subroutine uniform variables used by the vertex, tessellation control, tessellation evaluation,
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geometry, fragment and compute shader stages of <parameter>program</parameter>, respectively.
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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><constant>GL_TRANSFORM_FEEDBACK_VARYING</constant></term>
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<listitem>
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<para>
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The query is targeted at the set of output variables from the last non-fragment stage of <parameter>program</parameter> that would be
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captured if transform feedback were active.
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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><constant>GL_TRANSFORM_FEEDBACK_BUFFER</constant></term>
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<listitem>
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<para>
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The query is targeted at the set of active buffer binding points to which output variables in the
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<constant>GL_TRANSFORM_FEEDBACK_VARYING</constant> interface are written.
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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><constant>GL_BUFFER_VARIABLE</constant></term>
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<listitem>
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<para>
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The query is targeted at the set of active buffer variables used by <parameter>program</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><constant>GL_SHADER_STORAGE_BLOCK</constant></term>
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<listitem>
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<para>
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The query is targeted at the set of active shader storage blocks used by <parameter>program</parameter>.
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</para>
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</listitem>
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</varlistentry>
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</variablelist>
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<para>
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If <parameter>name</parameter> exactly matches the name string of one of the active resources
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for <parameter>programInterface</parameter>, the index of the matched resource is returned.
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Additionally, if <parameter>name</parameter> would exactly match the name string of an active
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resource if "[0]" were appended to <parameter>name</parameter>, the index of the matched
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resource is returned. Otherwise, <parameter>name</parameter> is considered not to be the name
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of an active resource, and <constant>GL_INVALID_INDEX</constant> is returned.
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</para>
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<para>
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For the interface <constant>GL_TRANSFORM_FEEDBACK_VARYING</constant>, the value <constant>GL_INVALID_INDEX</constant>
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should be returned when querying the index assigned to the special names
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<code>gl_NextBuffer</code>, <code>gl_SkipComponents1</code>, <code>gl_SkipComponents2</code>,
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<code>gl_SkipComponents3</code>, or <code>gl_SkipComponents4</code>.
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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_ENUM</constant> is generated if <parameter>programInterface</parameter>
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is not one of the accepted interface types.
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</para>
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<para>
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<constant>GL_INVALID_ENUM</constant> is generated if <parameter>programInterface</parameter> is
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<constant>GL_ATOMIC_COUNTER_BUFFER</constant> or <constant>GL_TRANSFORM_FEEDBACK_BUFFER</constant>, since active atomic
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counter and transform feedback buffer resources are not assigned name strings.
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</para>
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<para>
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Although not an error, <constant>GL_INVALID_INDEX</constant> is returned if <parameter>name</parameter>
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is not the name of a resource within the interface identified by <parameter>programInterface</parameter>.
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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>glGetProgramResourceName</refentrytitle></citerefentry>,
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<citerefentry><refentrytitle>glGetGetProgramResource</refentrytitle></citerefentry>,
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<citerefentry><refentrytitle>glGetProgramResourceLocation</refentrytitle></citerefentry>,
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<citerefentry><refentrytitle>glGetProgramResourceLocationIndex</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> 2013 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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