2013-10-10 23:58:54 +00:00
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<?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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2013-10-23 18:17:08 +00:00
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<refentry id="glGetActiveSubroutineUniform">
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2013-10-10 23:58:54 +00:00
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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>glGetActiveSubroutineUniform</refentrytitle>
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<manvolnum>3G</manvolnum>
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</refmeta>
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<refnamediv>
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<refname>glGetActiveSubroutineUniform</refname>
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<refpurpose>query a property of an active shader subroutine uniform</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>glGetActiveSubroutineUniformiv</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>GLenum <parameter>pname</parameter></paramdef>
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<paramdef>GLint *<parameter>values</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 for the subroutine parameter. <parameter>shadertype</parameter>
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must be one of <constant>GL_VERTEX_SHADER</constant>, <constant>GL_TESS_CONTROL_SHADER</constant>,
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<constant>GL_TESS_EVALUATION_SHADER</constant>, <constant>GL_GEOMETRY_SHADER</constant> or
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<constant>GL_FRAGMENT_SHADER</constant>.
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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>pname</parameter></term>
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<listitem>
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<para>
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Specifies the parameter of the shader subroutine uniform to query. <parameter>pname</parameter>
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must be <constant>GL_NUM_COMPATIBLE_SUBROUTINES</constant>, <constant>GL_COMPATIBLE_SUBROUTINES</constant>,
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<constant>GL_UNIFORM_SIZE</constant> or <constant>GL_UNIFORM_NAME_LENGTH</constant>.
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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>values</parameter></term>
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<listitem>
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<para>
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Specifies the address of a into which the queried value or values will be placed.
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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>glGetActiveSubroutineUniform</function> queries a parameter of an active shader subroutine uniform.
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<parameter>program</parameter> contains the name of the program containing the uniform. <parameter>shadertype</parameter>
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specifies the stage which which the uniform location, given by <parameter>index</parameter>, is valid. <parameter>index</parameter>
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must be between zero and the value of <constant>GL_ACTIVE_SUBROUTINE_UNIFORMS</constant> minus one for the
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shader stage.
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</para>
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<para>
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If <parameter>pname</parameter> is <constant>GL_NUM_COMPATIBLE_SUBROUTINES</constant>, a single integer indicating the number
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of subroutines that can be assigned to the uniform is returned in <parameter>values</parameter>.
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</para>
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<para>
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If <parameter>pname</parameter> is <constant>GL_COMPATIBLE_SUBROUTINES</constant>, an array of integers is returned in
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<parameter>values</parameter>, with each integer specifying the index of an active subroutine that can be assigned to
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the selected subroutine uniform. The number of integers returned is the same as the value returned for
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<constant>GL_NUM_COMPATIBLE_SUBROUTINES</constant>.
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</para>
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<para>
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If <parameter>pname</parameter> is <constant>GL_UNIFORM_SIZE</constant>, a single integer is returned in <parameter>values</parameter>.
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If the selected subroutine uniform is an array, the declared size of the array is returned; otherwise, one is returned.
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</para>
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<para>
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If <parameter>pname</parameter> is <constant>GL_UNIFORM_NAME_LENGTH</constant>, a single integer specifying the length of
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the subroutine uniform name (including the terminating null character) is returned in <parameter>values</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_ENUM</constant> is generated if <parameter>shadertype</parameter> or <parameter>pname</parameter>
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is not one of the accepted values.
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</para>
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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_UNIFORMS</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>glGetActiveSubroutineUniformName</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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