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1152 lines
50 KiB
XML
1152 lines
50 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="glGetActiveUniform">
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<refentryinfo>
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<copyright>
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<year>2003-2005</year>
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<holder>3Dlabs Inc. Ltd.</holder>
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</copyright>
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<copyright>
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<year>2010-2013</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>glGetActiveUniform</refentrytitle>
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<manvolnum>3G</manvolnum>
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</refmeta>
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<refnamediv>
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<refname>glGetActiveUniform</refname>
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<refpurpose>Returns information about an active uniform variable for the specified program object</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>glGetActiveUniform</function></funcdef>
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<paramdef>GLuint <parameter>program</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>GLint *<parameter>size</parameter></paramdef>
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<paramdef>GLenum *<parameter>type</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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<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>Specifies the program object to be
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queried.</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>Specifies the index of the uniform variable to
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be queried.</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>Specifies the maximum number of characters
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OpenGL is allowed to write in the character buffer
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indicated by <parameter>name</parameter>.</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>Returns the number of characters actually
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written by OpenGL in the string indicated by
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<parameter>name</parameter> (excluding the null
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terminator) if a value other than
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<constant>NULL</constant> is passed.</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><parameter>size</parameter></term>
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<listitem>
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<para>Returns the size of the uniform
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variable.</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><parameter>type</parameter></term>
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<listitem>
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<para>Returns the data type of the uniform
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variable.</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>Returns a null terminated string containing
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the name of the uniform variable.</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><function>glGetActiveUniform</function> returns
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information about an active uniform variable in the program
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object specified by <parameter>program</parameter>. The number
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of active uniform variables can be obtained by calling
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<citerefentry><refentrytitle>glGetProgram</refentrytitle></citerefentry>
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with the value <constant>GL_ACTIVE_UNIFORMS</constant>. A value
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of 0 for <parameter>index</parameter> selects the first active
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uniform variable. Permissible values for
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|
<parameter>index</parameter> range from 0 to the number of
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active uniform variables minus 1.</para>
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<para>Shaders may use either built-in uniform variables,
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user-defined uniform variables, or both. Built-in uniform
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variables have a prefix of "gl_" and reference
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existing OpenGL state or values derived from such state (e.g.,
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<parameter>gl_DepthRangeParameters</parameter>, see the OpenGL
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Shading Language specification for a complete list.)
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User-defined uniform variables have arbitrary names and obtain
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their values from the application through calls to
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<citerefentry><refentrytitle>glUniform</refentrytitle></citerefentry>.
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A uniform variable (either built-in or user-defined) is
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considered active if it is determined during the link operation
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that it may be accessed during program execution. Therefore,
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<parameter>program</parameter> should have previously been the
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target of a call to
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<citerefentry><refentrytitle>glLinkProgram</refentrytitle></citerefentry>,
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but it is not necessary for it to have been linked
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successfully.</para>
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<para>The size of the character buffer required to store the
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longest uniform variable name in <parameter>program</parameter>
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can be obtained by calling
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|
<citerefentry><refentrytitle>glGetProgram</refentrytitle></citerefentry>
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with the value
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<constant>GL_ACTIVE_UNIFORM_MAX_LENGTH</constant>. This value
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|
should be used to allocate a buffer of sufficient size to store
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|
the returned uniform variable name. The size of this character
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|
buffer is passed in <parameter>bufSize</parameter>, and a
|
|
pointer to this character buffer is passed in
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|
<parameter>name.</parameter></para>
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|
|
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<para><function>glGetActiveUniform</function> returns the name
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|
of the uniform variable indicated by
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|
<parameter>index</parameter>, storing it in the character buffer
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specified by <parameter>name</parameter>. The string returned
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|
will be null terminated. The actual number of characters written
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|
into this buffer is returned in <parameter>length</parameter>,
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|
and this count does not include the null termination character.
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|
If the length of the returned string is not required, a value of
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|
<constant>NULL</constant> can be passed in the
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|
<parameter>length</parameter> argument.</para>
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<para>The <parameter>type</parameter>
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argument will return a pointer to the uniform variable's data
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|
type. The symbolic constants returned for uniform types are shown in the
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table below.
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<informaltable frame="topbot">
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<tgroup cols="2" align="left">
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<colspec colwidth="1.1*" />
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<colspec colwidth="1*" />
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<thead>
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<row>
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<entry rowsep="1" align="left"><emphasis role="bold">
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Returned Symbolic Contant
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</emphasis></entry>
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<entry rowsep="1" align="left"><emphasis role="bold">
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Shader Uniform Type
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</emphasis></entry>
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</row>
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</thead>
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<tbody>
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<row>
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<entry align="left">
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|
<constant>GL_FLOAT</constant>
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</entry>
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<entry align="left">
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|
<constant>float</constant>
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</entry>
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</row>
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<row>
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|
<entry align="left">
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<constant>GL_FLOAT_VEC2</constant>
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|
</entry>
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|
<entry align="left">
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<constant>vec2</constant>
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</entry>
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</row>
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<row>
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|
<entry align="left">
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|
<constant>GL_FLOAT_VEC3</constant>
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|
</entry>
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<entry align="left">
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|
<constant>vec3</constant>
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</entry>
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</row>
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<row>
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|
<entry align="left">
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|
<constant>GL_FLOAT_VEC4</constant>
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|
</entry>
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|
<entry align="left">
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|
<constant>vec4</constant>
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</entry>
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</row>
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|
<row>
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<entry align="left">
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|
<constant>GL_DOUBLE</constant>
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</entry>
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|
<entry align="left">
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<constant>double</constant>
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</entry>
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|
</row>
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<row>
|
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<entry align="left">
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|
<constant>GL_DOUBLE_VEC2</constant>
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</entry>
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|
<entry align="left">
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|
<constant>dvec2</constant>
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</entry>
|
|
</row>
|
|
<row>
|
|
<entry align="left">
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|
<constant>GL_DOUBLE_VEC3</constant>
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</entry>
|
|
<entry align="left">
|
|
<constant>dvec3</constant>
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|
</entry>
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|
</row>
|
|
<row>
|
|
<entry align="left">
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|
<constant>GL_DOUBLE_VEC4</constant>
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|
</entry>
|
|
<entry align="left">
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|
<constant>dvec4</constant>
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</entry>
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</row>
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<row>
|
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<entry align="left">
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<constant>GL_INT</constant>
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</entry>
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<entry align="left">
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<constant>int</constant>
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</entry>
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</row>
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<row>
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<entry align="left">
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<constant>GL_INT_VEC2</constant>
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</entry>
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<entry align="left">
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<constant>ivec2</constant>
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</entry>
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</row>
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<row>
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<entry align="left">
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<constant>GL_INT_VEC3</constant>
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|
</entry>
|
|
<entry align="left">
|
|
<constant>ivec3</constant>
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|
</entry>
|
|
</row>
|
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<row>
|
|
<entry align="left">
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|
<constant>GL_INT_VEC4</constant>
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|
</entry>
|
|
<entry align="left">
|
|
<constant>ivec4</constant>
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</entry>
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|
</row>
|
|
<row>
|
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<entry align="left">
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|
<constant>GL_UNSIGNED_INT</constant>
|
|
</entry>
|
|
<entry align="left">
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|
<constant>unsigned int</constant>
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|
</entry>
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|
</row>
|
|
<row>
|
|
<entry align="left">
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|
<constant>GL_UNSIGNED_INT_VEC2</constant>
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|
</entry>
|
|
<entry align="left">
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|
<constant>uvec2</constant>
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|
</entry>
|
|
</row>
|
|
<row>
|
|
<entry align="left">
|
|
<constant>GL_UNSIGNED_INT_VEC3</constant>
|
|
</entry>
|
|
<entry align="left">
|
|
<constant>uvec3</constant>
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|
</entry>
|
|
</row>
|
|
<row>
|
|
<entry align="left">
|
|
<constant>GL_UNSIGNED_INT_VEC4</constant>
|
|
</entry>
|
|
<entry align="left">
|
|
<constant>uvec4</constant>
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|
</entry>
|
|
</row>
|
|
<row>
|
|
<entry align="left">
|
|
<constant>GL_BOOL</constant>
|
|
</entry>
|
|
<entry align="left">
|
|
<constant>bool</constant>
|
|
</entry>
|
|
</row>
|
|
<row>
|
|
<entry align="left">
|
|
<constant>GL_BOOL_VEC2</constant>
|
|
</entry>
|
|
<entry align="left">
|
|
<constant>bvec2</constant>
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|
</entry>
|
|
</row>
|
|
<row>
|
|
<entry align="left">
|
|
<constant>GL_BOOL_VEC3</constant>
|
|
</entry>
|
|
<entry align="left">
|
|
<constant>bvec3</constant>
|
|
</entry>
|
|
</row>
|
|
<row>
|
|
<entry align="left">
|
|
<constant>GL_BOOL_VEC4</constant>
|
|
</entry>
|
|
<entry align="left">
|
|
<constant>bvec4</constant>
|
|
</entry>
|
|
</row>
|
|
<row>
|
|
<entry align="left">
|
|
<constant>GL_FLOAT_MAT2</constant>
|
|
</entry>
|
|
<entry align="left">
|
|
<constant>mat2</constant>
|
|
</entry>
|
|
</row>
|
|
<row>
|
|
<entry align="left">
|
|
<constant>GL_FLOAT_MAT3</constant>
|
|
</entry>
|
|
<entry align="left">
|
|
<constant>mat3</constant>
|
|
</entry>
|
|
</row>
|
|
<row>
|
|
<entry align="left">
|
|
<constant>GL_FLOAT_MAT4</constant>
|
|
</entry>
|
|
<entry align="left">
|
|
<constant>mat4</constant>
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</entry>
|
|
</row>
|
|
<row>
|
|
<entry align="left">
|
|
<constant>GL_FLOAT_MAT2x3</constant>
|
|
</entry>
|
|
<entry align="left">
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<constant>mat2x3</constant>
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|
</entry>
|
|
</row>
|
|
<row>
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|
<entry align="left">
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|
<constant>GL_FLOAT_MAT2x4</constant>
|
|
</entry>
|
|
<entry align="left">
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|
<constant>mat2x4</constant>
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|
</entry>
|
|
</row>
|
|
<row>
|
|
<entry align="left">
|
|
<constant>GL_FLOAT_MAT3x2</constant>
|
|
</entry>
|
|
<entry align="left">
|
|
<constant>mat3x2</constant>
|
|
</entry>
|
|
</row>
|
|
<row>
|
|
<entry align="left">
|
|
<constant>GL_FLOAT_MAT3x4</constant>
|
|
</entry>
|
|
<entry align="left">
|
|
<constant>mat3x4</constant>
|
|
</entry>
|
|
</row>
|
|
<row>
|
|
<entry align="left">
|
|
<constant>GL_FLOAT_MAT4x2</constant>
|
|
</entry>
|
|
<entry align="left">
|
|
<constant>mat4x2</constant>
|
|
</entry>
|
|
</row>
|
|
<row>
|
|
<entry align="left">
|
|
<constant>GL_FLOAT_MAT4x3</constant>
|
|
</entry>
|
|
<entry align="left">
|
|
<constant>mat4x3</constant>
|
|
</entry>
|
|
</row>
|
|
<row>
|
|
<entry align="left">
|
|
<constant>GL_DOUBLE_MAT2</constant>
|
|
</entry>
|
|
<entry align="left">
|
|
<constant>dmat2</constant>
|
|
</entry>
|
|
</row>
|
|
<row>
|
|
<entry align="left">
|
|
<constant>GL_DOUBLE_MAT3</constant>
|
|
</entry>
|
|
<entry align="left">
|
|
<constant>dmat3</constant>
|
|
</entry>
|
|
</row>
|
|
<row>
|
|
<entry align="left">
|
|
<constant>GL_DOUBLE_MAT4</constant>
|
|
</entry>
|
|
<entry align="left">
|
|
<constant>dmat4</constant>
|
|
</entry>
|
|
</row>
|
|
<row>
|
|
<entry align="left">
|
|
<constant>GL_DOUBLE_MAT2x3</constant>
|
|
</entry>
|
|
<entry align="left">
|
|
<constant>dmat2x3</constant>
|
|
</entry>
|
|
</row>
|
|
<row>
|
|
<entry align="left">
|
|
<constant>GL_DOUBLE_MAT2x4</constant>
|
|
</entry>
|
|
<entry align="left">
|
|
<constant>dmat2x4</constant>
|
|
</entry>
|
|
</row>
|
|
<row>
|
|
<entry align="left">
|
|
<constant>GL_DOUBLE_MAT3x2</constant>
|
|
</entry>
|
|
<entry align="left">
|
|
<constant>dmat3x2</constant>
|
|
</entry>
|
|
</row>
|
|
<row>
|
|
<entry align="left">
|
|
<constant>GL_DOUBLE_MAT3x4</constant>
|
|
</entry>
|
|
<entry align="left">
|
|
<constant>dmat3x4</constant>
|
|
</entry>
|
|
</row>
|
|
<row>
|
|
<entry align="left">
|
|
<constant>GL_DOUBLE_MAT4x2</constant>
|
|
</entry>
|
|
<entry align="left">
|
|
<constant>dmat4x2</constant>
|
|
</entry>
|
|
</row>
|
|
<row>
|
|
<entry align="left">
|
|
<constant>GL_DOUBLE_MAT4x3</constant>
|
|
</entry>
|
|
<entry align="left">
|
|
<constant>dmat4x3</constant>
|
|
</entry>
|
|
</row>
|
|
<row>
|
|
<entry align="left">
|
|
<constant>GL_SAMPLER_1D</constant>
|
|
</entry>
|
|
<entry align="left">
|
|
<constant>sampler1D</constant>
|
|
</entry>
|
|
</row>
|
|
<row>
|
|
<entry align="left">
|
|
<constant>GL_SAMPLER_2D</constant>
|
|
</entry>
|
|
<entry align="left">
|
|
<constant>sampler2D</constant>
|
|
</entry>
|
|
</row>
|
|
<row>
|
|
<entry align="left">
|
|
<constant>GL_SAMPLER_3D</constant>
|
|
</entry>
|
|
<entry align="left">
|
|
<constant>sampler3D</constant>
|
|
</entry>
|
|
</row>
|
|
<row>
|
|
<entry align="left">
|
|
<constant>GL_SAMPLER_CUBE</constant>
|
|
</entry>
|
|
<entry align="left">
|
|
<constant>samplerCube</constant>
|
|
</entry>
|
|
</row>
|
|
<row>
|
|
<entry align="left">
|
|
<constant>GL_SAMPLER_1D_SHADOW</constant>
|
|
</entry>
|
|
<entry align="left">
|
|
<constant>sampler1DShadow</constant>
|
|
</entry>
|
|
</row>
|
|
<row>
|
|
<entry align="left">
|
|
<constant>GL_SAMPLER_2D_SHADOW</constant>
|
|
</entry>
|
|
<entry align="left">
|
|
<constant>sampler2DShadow</constant>
|
|
</entry>
|
|
</row>
|
|
<row>
|
|
<entry align="left">
|
|
<constant>GL_SAMPLER_1D_ARRAY</constant>
|
|
</entry>
|
|
<entry align="left">
|
|
<constant>sampler1DArray</constant>
|
|
</entry>
|
|
</row>
|
|
<row>
|
|
<entry align="left">
|
|
<constant>GL_SAMPLER_2D_ARRAY</constant>
|
|
</entry>
|
|
<entry align="left">
|
|
<constant>sampler2DArray</constant>
|
|
</entry>
|
|
</row>
|
|
<row>
|
|
<entry align="left">
|
|
<constant>GL_SAMPLER_1D_ARRAY_SHADOW</constant>
|
|
</entry>
|
|
<entry align="left">
|
|
<constant>sampler1DArrayShadow</constant>
|
|
</entry>
|
|
</row>
|
|
<row>
|
|
<entry align="left">
|
|
<constant>GL_SAMPLER_2D_ARRAY_SHADOW</constant>
|
|
</entry>
|
|
<entry align="left">
|
|
<constant>sampler2DArrayShadow</constant>
|
|
</entry>
|
|
</row>
|
|
<row>
|
|
<entry align="left">
|
|
<constant>GL_SAMPLER_2D_MULTISAMPLE</constant>
|
|
</entry>
|
|
<entry align="left">
|
|
<constant>sampler2DMS</constant>
|
|
</entry>
|
|
</row>
|
|
<row>
|
|
<entry align="left">
|
|
<constant>GL_SAMPLER_2D_MULTISAMPLE_ARRAY</constant>
|
|
</entry>
|
|
<entry align="left">
|
|
<constant>sampler2DMSArray</constant>
|
|
</entry>
|
|
</row>
|
|
<row>
|
|
<entry align="left">
|
|
<constant>GL_SAMPLER_CUBE_SHADOW</constant>
|
|
</entry>
|
|
<entry align="left">
|
|
<constant>samplerCubeShadow</constant>
|
|
</entry>
|
|
</row>
|
|
<row>
|
|
<entry align="left">
|
|
<constant>GL_SAMPLER_BUFFER</constant>
|
|
</entry>
|
|
<entry align="left">
|
|
<constant>samplerBuffer</constant>
|
|
</entry>
|
|
</row>
|
|
<row>
|
|
<entry align="left">
|
|
<constant>GL_SAMPLER_2D_RECT</constant>
|
|
</entry>
|
|
<entry align="left">
|
|
<constant>sampler2DRect</constant>
|
|
</entry>
|
|
</row>
|
|
<row>
|
|
<entry align="left">
|
|
<constant>GL_SAMPLER_2D_RECT_SHADOW</constant>
|
|
</entry>
|
|
<entry align="left">
|
|
<constant>sampler2DRectShadow</constant>
|
|
</entry>
|
|
</row>
|
|
<row>
|
|
<entry align="left">
|
|
<constant>GL_INT_SAMPLER_1D</constant>
|
|
</entry>
|
|
<entry align="left">
|
|
<constant>isampler1D</constant>
|
|
</entry>
|
|
</row>
|
|
<row>
|
|
<entry align="left">
|
|
<constant>GL_INT_SAMPLER_2D</constant>
|
|
</entry>
|
|
<entry align="left">
|
|
<constant>isampler2D</constant>
|
|
</entry>
|
|
</row>
|
|
<row>
|
|
<entry align="left">
|
|
<constant>GL_INT_SAMPLER_3D</constant>
|
|
</entry>
|
|
<entry align="left">
|
|
<constant>isampler3D</constant>
|
|
</entry>
|
|
</row>
|
|
<row>
|
|
<entry align="left">
|
|
<constant>GL_INT_SAMPLER_CUBE</constant>
|
|
</entry>
|
|
<entry align="left">
|
|
<constant>isamplerCube</constant>
|
|
</entry>
|
|
</row>
|
|
<row>
|
|
<entry align="left">
|
|
<constant>GL_INT_SAMPLER_1D_ARRAY</constant>
|
|
</entry>
|
|
<entry align="left">
|
|
<constant>isampler1DArray</constant>
|
|
</entry>
|
|
</row>
|
|
<row>
|
|
<entry align="left">
|
|
<constant>GL_INT_SAMPLER_2D_ARRAY</constant>
|
|
</entry>
|
|
<entry align="left">
|
|
<constant>isampler2DArray</constant>
|
|
</entry>
|
|
</row>
|
|
<row>
|
|
<entry align="left">
|
|
<constant>GL_INT_SAMPLER_2D_MULTISAMPLE</constant>
|
|
</entry>
|
|
<entry align="left">
|
|
<constant>isampler2DMS</constant>
|
|
</entry>
|
|
</row>
|
|
<row>
|
|
<entry align="left">
|
|
<constant>GL_INT_SAMPLER_2D_MULTISAMPLE_ARRAY</constant>
|
|
</entry>
|
|
<entry align="left">
|
|
<constant>isampler2DMSArray</constant>
|
|
</entry>
|
|
</row>
|
|
<row>
|
|
<entry align="left">
|
|
<constant>GL_INT_SAMPLER_BUFFER</constant>
|
|
</entry>
|
|
<entry align="left">
|
|
<constant>isamplerBuffer</constant>
|
|
</entry>
|
|
</row>
|
|
<row>
|
|
<entry align="left">
|
|
<constant>GL_INT_SAMPLER_2D_RECT</constant>
|
|
</entry>
|
|
<entry align="left">
|
|
<constant>isampler2DRect</constant>
|
|
</entry>
|
|
</row>
|
|
<row>
|
|
<entry align="left">
|
|
<constant>GL_UNSIGNED_INT_SAMPLER_1D</constant>
|
|
</entry>
|
|
<entry align="left">
|
|
<constant>usampler1D</constant>
|
|
</entry>
|
|
</row>
|
|
<row>
|
|
<entry align="left">
|
|
<constant>GL_UNSIGNED_INT_SAMPLER_2D</constant>
|
|
</entry>
|
|
<entry align="left">
|
|
<constant>usampler2D</constant>
|
|
</entry>
|
|
</row>
|
|
<row>
|
|
<entry align="left">
|
|
<constant>GL_UNSIGNED_INT_SAMPLER_3D</constant>
|
|
</entry>
|
|
<entry align="left">
|
|
<constant>usampler3D</constant>
|
|
</entry>
|
|
</row>
|
|
<row>
|
|
<entry align="left">
|
|
<constant>GL_UNSIGNED_INT_SAMPLER_CUBE</constant>
|
|
</entry>
|
|
<entry align="left">
|
|
<constant>usamplerCube</constant>
|
|
</entry>
|
|
</row>
|
|
<row>
|
|
<entry align="left">
|
|
<constant>GL_UNSIGNED_INT_SAMPLER_1D_ARRAY</constant>
|
|
</entry>
|
|
<entry align="left">
|
|
<constant>usampler2DArray</constant>
|
|
</entry>
|
|
</row>
|
|
<row>
|
|
<entry align="left">
|
|
<constant>GL_UNSIGNED_INT_SAMPLER_2D_ARRAY</constant>
|
|
</entry>
|
|
<entry align="left">
|
|
<constant>usampler2DArray</constant>
|
|
</entry>
|
|
</row>
|
|
<row>
|
|
<entry align="left">
|
|
<constant>GL_UNSIGNED_INT_SAMPLER_2D_MULTISAMPLE</constant>
|
|
</entry>
|
|
<entry align="left">
|
|
<constant>usampler2DMS</constant>
|
|
</entry>
|
|
</row>
|
|
<row>
|
|
<entry align="left">
|
|
<constant>GL_UNSIGNED_INT_SAMPLER_2D_MULTISAMPLE_ARRAY</constant>
|
|
</entry>
|
|
<entry align="left">
|
|
<constant>usampler2DMSArray</constant>
|
|
</entry>
|
|
</row>
|
|
<row>
|
|
<entry align="left">
|
|
<constant>GL_UNSIGNED_INT_SAMPLER_BUFFER</constant>
|
|
</entry>
|
|
<entry align="left">
|
|
<constant>usamplerBuffer</constant>
|
|
</entry>
|
|
</row>
|
|
<row>
|
|
<entry align="left">
|
|
<constant>GL_UNSIGNED_INT_SAMPLER_2D_RECT</constant>
|
|
</entry>
|
|
<entry align="left">
|
|
<constant>usampler2DRect</constant>
|
|
</entry>
|
|
</row>
|
|
|
|
<row>
|
|
<entry align="left">
|
|
<constant>GL_IMAGE_1D</constant>
|
|
</entry>
|
|
<entry align="left">
|
|
<constant>image1D</constant>
|
|
</entry>
|
|
</row>
|
|
<row>
|
|
<entry align="left">
|
|
<constant>GL_IMAGE_2D</constant>
|
|
</entry>
|
|
<entry align="left">
|
|
<constant>image2D</constant>
|
|
</entry>
|
|
</row>
|
|
<row>
|
|
<entry align="left">
|
|
<constant>GL_IMAGE_3D</constant>
|
|
</entry>
|
|
<entry align="left">
|
|
<constant>image3D</constant>
|
|
</entry>
|
|
</row>
|
|
<row>
|
|
<entry align="left">
|
|
<constant>GL_IMAGE_2D_RECT</constant>
|
|
</entry>
|
|
<entry align="left">
|
|
<constant>image2DRect</constant>
|
|
</entry>
|
|
</row>
|
|
<row>
|
|
<entry align="left">
|
|
<constant>GL_IMAGE_CUBE</constant>
|
|
</entry>
|
|
<entry align="left">
|
|
<constant>imageCube</constant>
|
|
</entry>
|
|
</row>
|
|
<row>
|
|
<entry align="left">
|
|
<constant>GL_IMAGE_BUFFER</constant>
|
|
</entry>
|
|
<entry align="left">
|
|
<constant>imageBuffer</constant>
|
|
</entry>
|
|
</row>
|
|
<row>
|
|
<entry align="left">
|
|
<constant>GL_IMAGE_1D_ARRAY</constant>
|
|
</entry>
|
|
<entry align="left">
|
|
<constant>image1DArray</constant>
|
|
</entry>
|
|
</row>
|
|
<row>
|
|
<entry align="left">
|
|
<constant>GL_IMAGE_2D_ARRAY</constant>
|
|
</entry>
|
|
<entry align="left">
|
|
<constant>image2DArray</constant>
|
|
</entry>
|
|
</row>
|
|
<row>
|
|
<entry align="left">
|
|
<constant>GL_IMAGE_2D_MULTISAMPLE</constant>
|
|
</entry>
|
|
<entry align="left">
|
|
<constant>image2DMS</constant>
|
|
</entry>
|
|
</row>
|
|
<row>
|
|
<entry align="left">
|
|
<constant>GL_IMAGE_2D_MULTISAMPLE_ARRAY</constant>
|
|
</entry>
|
|
<entry align="left">
|
|
<constant>image2DMSArray</constant>
|
|
</entry>
|
|
</row>
|
|
<row>
|
|
<entry align="left">
|
|
<constant>GL_INT_IMAGE_1D</constant>
|
|
</entry>
|
|
<entry align="left">
|
|
<constant>iimage1D</constant>
|
|
</entry>
|
|
</row>
|
|
<row>
|
|
<entry align="left">
|
|
<constant>GL_INT_IMAGE_2D</constant>
|
|
</entry>
|
|
<entry align="left">
|
|
<constant>iimage2D</constant>
|
|
</entry>
|
|
</row>
|
|
<row>
|
|
<entry align="left">
|
|
<constant>GL_INT_IMAGE_3D</constant>
|
|
</entry>
|
|
<entry align="left">
|
|
<constant>iimage3D</constant>
|
|
</entry>
|
|
</row>
|
|
<row>
|
|
<entry align="left">
|
|
<constant>GL_INT_IMAGE_2D_RECT</constant>
|
|
</entry>
|
|
<entry align="left">
|
|
<constant>iimage2DRect</constant>
|
|
</entry>
|
|
</row>
|
|
<row>
|
|
<entry align="left">
|
|
<constant>GL_INT_IMAGE_CUBE</constant>
|
|
</entry>
|
|
<entry align="left">
|
|
<constant>iimageCube</constant>
|
|
</entry>
|
|
</row>
|
|
<row>
|
|
<entry align="left">
|
|
<constant>GL_INT_IMAGE_BUFFER</constant>
|
|
</entry>
|
|
<entry align="left">
|
|
<constant>iimageBuffer</constant>
|
|
</entry>
|
|
</row>
|
|
<row>
|
|
<entry align="left">
|
|
<constant>GL_INT_IMAGE_1D_ARRAY</constant>
|
|
</entry>
|
|
<entry align="left">
|
|
<constant>iimage1DArray</constant>
|
|
</entry>
|
|
</row>
|
|
<row>
|
|
<entry align="left">
|
|
<constant>GL_INT_IMAGE_2D_ARRAY</constant>
|
|
</entry>
|
|
<entry align="left">
|
|
<constant>iimage2DArray</constant>
|
|
</entry>
|
|
</row>
|
|
<row>
|
|
<entry align="left">
|
|
<constant>GL_INT_IMAGE_2D_MULTISAMPLE</constant>
|
|
</entry>
|
|
<entry align="left">
|
|
<constant>iimage2DMS</constant>
|
|
</entry>
|
|
</row>
|
|
<row>
|
|
<entry align="left">
|
|
<constant>GL_INT_IMAGE_2D_MULTISAMPLE_ARRAY</constant>
|
|
</entry>
|
|
<entry align="left">
|
|
<constant>iimage2DMSArray</constant>
|
|
</entry>
|
|
</row>
|
|
<row>
|
|
<entry align="left">
|
|
<constant>GL_UNSIGNED_INT_IMAGE_1D</constant>
|
|
</entry>
|
|
<entry align="left">
|
|
<constant>uimage1D</constant>
|
|
</entry>
|
|
</row>
|
|
<row>
|
|
<entry align="left">
|
|
<constant>GL_UNSIGNED_INT_IMAGE_2D</constant>
|
|
</entry>
|
|
<entry align="left">
|
|
<constant>uimage2D</constant>
|
|
</entry>
|
|
</row>
|
|
<row>
|
|
<entry align="left">
|
|
<constant>GL_UNSIGNED_INT_IMAGE_3D</constant>
|
|
</entry>
|
|
<entry align="left">
|
|
<constant>uimage3D</constant>
|
|
</entry>
|
|
</row>
|
|
<row>
|
|
<entry align="left">
|
|
<constant>GL_UNSIGNED_INT_IMAGE_2D_RECT</constant>
|
|
</entry>
|
|
<entry align="left">
|
|
<constant>uimage2DRect</constant>
|
|
</entry>
|
|
</row>
|
|
<row>
|
|
<entry align="left">
|
|
<constant>GL_UNSIGNED_INT_IMAGE_CUBE</constant>
|
|
</entry>
|
|
<entry align="left">
|
|
<constant>uimageCube</constant>
|
|
</entry>
|
|
</row>
|
|
<row>
|
|
<entry align="left">
|
|
<constant>GL_UNSIGNED_INT_IMAGE_BUFFER</constant>
|
|
</entry>
|
|
<entry align="left">
|
|
<constant>uimageBuffer</constant>
|
|
</entry>
|
|
</row>
|
|
<row>
|
|
<entry align="left">
|
|
<constant>GL_UNSIGNED_INT_IMAGE_1D_ARRAY</constant>
|
|
</entry>
|
|
<entry align="left">
|
|
<constant>uimage1DArray</constant>
|
|
</entry>
|
|
</row>
|
|
<row>
|
|
<entry align="left">
|
|
<constant>GL_UNSIGNED_INT_IMAGE_2D_ARRAY</constant>
|
|
</entry>
|
|
<entry align="left">
|
|
<constant>uimage2DArray</constant>
|
|
</entry>
|
|
</row>
|
|
<row>
|
|
<entry align="left">
|
|
<constant>GL_UNSIGNED_INT_IMAGE_2D_MULTISAMPLE</constant>
|
|
</entry>
|
|
<entry align="left">
|
|
<constant>uimage2DMS</constant>
|
|
</entry>
|
|
</row>
|
|
<row>
|
|
<entry align="left">
|
|
<constant>GL_UNSIGNED_INT_IMAGE_2D_MULTISAMPLE_ARRAY</constant>
|
|
</entry>
|
|
<entry align="left">
|
|
<constant>uimage2DMSArray</constant>
|
|
</entry>
|
|
</row>
|
|
<row>
|
|
<entry align="left">
|
|
<constant>GL_UNSIGNED_INT_ATOMIC_COUNTER</constant>
|
|
</entry>
|
|
<entry align="left">
|
|
<constant>atomic_uint</constant>
|
|
</entry>
|
|
</row>
|
|
</tbody>
|
|
</tgroup>
|
|
</informaltable>
|
|
</para>
|
|
|
|
<para>If one or more elements of an array are active, the name
|
|
of the array is returned in <parameter>name</parameter>, the
|
|
type is returned in <parameter>type</parameter>, and the
|
|
<parameter>size</parameter> parameter returns the highest array
|
|
element index used, plus one, as determined by the compiler
|
|
and/or linker. Only one active uniform variable will be reported
|
|
for a uniform array.</para>
|
|
|
|
<para>Uniform variables that are declared as structures or
|
|
arrays of structures will not be returned directly by this
|
|
function. Instead, each of these uniform variables will be
|
|
reduced to its fundamental components containing the
|
|
"." and "[]" operators such that each of the
|
|
names is valid as an argument to
|
|
<citerefentry><refentrytitle>glGetUniformLocation</refentrytitle></citerefentry>.
|
|
Each of these reduced uniform variables is counted as one active
|
|
uniform variable and is assigned an index. A valid name cannot
|
|
be a structure, an array of structures, or a subcomponent of a
|
|
vector or matrix.</para>
|
|
|
|
<para>The size of the uniform variable will be returned in
|
|
<parameter>size</parameter>. Uniform variables other than arrays
|
|
will have a size of 1. Structures and arrays of structures will
|
|
be reduced as described earlier, such that each of the names
|
|
returned will be a data type in the earlier list. If this
|
|
reduction results in an array, the size returned will be as
|
|
described for uniform arrays; otherwise, the size returned will
|
|
be 1.</para>
|
|
|
|
<para>The list of active uniform variables may include both
|
|
built-in uniform variables (which begin with the prefix
|
|
"gl_") as well as user-defined uniform variable
|
|
names.</para>
|
|
|
|
<para>This function will return as much information as it can
|
|
about the specified active uniform variable. If no information
|
|
is available, <parameter>length</parameter> will be 0, and
|
|
<parameter>name</parameter> will be an empty string. This
|
|
situation could occur if this function is called after a link
|
|
operation that failed. If an error occurs, the return values
|
|
<parameter>length</parameter>, <parameter>size</parameter>,
|
|
<parameter>type</parameter>, and <parameter>name</parameter>
|
|
will be unmodified.</para>
|
|
</refsect1>
|
|
<refsect1 id="notes"><title>Notes</title>
|
|
<para>
|
|
The double types, <constant>GL_DOUBLE</constant>, <constant>GL_DOUBLE_VEC2</constant>,
|
|
<constant>GL_DOUBLE_VEC3</constant>, <constant>GL_DOUBLE_VEC4</constant>,
|
|
<constant>GL_DOUBLE_MAT2</constant>, <constant>GL_DOUBLE_MAT3</constant>,
|
|
<constant>GL_DOUBLE_MAT4</constant>, <constant>GL_DOUBLE_MAT2x3</constant>,
|
|
<constant>GL_DOUBLE_MAT2x4</constant>, <constant>GL_DOUBLE_MAT3x2</constant>,
|
|
<constant>GL_DOUBLE_MAT3x4</constant>, <constant>GL_DOUBLE_MAT4x2</constant>,
|
|
and <constant>GL_DOUBLE_MAT4x3</constant> are only available if the GL
|
|
version is 4.1 or higher.
|
|
</para>
|
|
<para>
|
|
The image types,
|
|
<constant>GL_IMAGE_1D</constant>,
|
|
<constant>GL_IMAGE_2D</constant>,
|
|
<constant>GL_IMAGE_3D</constant>,
|
|
<constant>GL_IMAGE_2D_RECT</constant>,
|
|
<constant>GL_IMAGE_CUBE</constant>,
|
|
<constant>GL_IMAGE_BUFFER</constant>,
|
|
<constant>GL_IMAGE_1D_ARRAY</constant>,
|
|
<constant>GL_IMAGE_2D_ARRAY</constant>,
|
|
<constant>GL_IMAGE_2D_MULTISAMPLE</constant>,
|
|
<constant>GL_IMAGE_2D_MULTISAMPLE_ARRAY</constant>,
|
|
<constant>GL_INT_IMAGE_1D</constant>,
|
|
<constant>GL_INT_IMAGE_2D</constant>,
|
|
<constant>GL_INT_IMAGE_3D</constant>,
|
|
<constant>GL_INT_IMAGE_2D_RECT</constant>,
|
|
<constant>GL_INT_IMAGE_CUBE</constant>,
|
|
<constant>GL_INT_IMAGE_BUFFER</constant>,
|
|
<constant>GL_INT_IMAGE_1D_ARRAY</constant>,
|
|
<constant>GL_INT_IMAGE_2D_ARRAY</constant>,
|
|
<constant>GL_INT_IMAGE_2D_MULTISAMPLE</constant>,
|
|
<constant>GL_INT_IMAGE_2D_MULTISAMPLE_ARRAY</constant>,
|
|
<constant>GL_UNSIGNED_INT_IMAGE_1D</constant>,
|
|
<constant>GL_UNSIGNED_INT_IMAGE_2D</constant>,
|
|
<constant>GL_UNSIGNED_INT_IMAGE_3D</constant>,
|
|
<constant>GL_UNSIGNED_INT_IMAGE_2D_RECT</constant>,
|
|
<constant>GL_UNSIGNED_INT_IMAGE_CUBE</constant>,
|
|
<constant>GL_UNSIGNED_INT_IMAGE_BUFFER</constant>,
|
|
<constant>GL_UNSIGNED_INT_IMAGE_1D_ARRAY</constant>,
|
|
<constant>GL_UNSIGNED_INT_IMAGE_2D_ARRAY</constant>,
|
|
<constant>GL_UNSIGNED_INT_IMAGE_2D_MULTISAMPLE</constant>,
|
|
<constant>GL_UNSIGNED_INT_IMAGE_2D_MULTISAMPLE_ARRAY</constant>,
|
|
and the atomic counter type,
|
|
<constant>GL_UNSIGNED_INT_ATOMIC_COUNTER</constant>
|
|
are only available if the GL
|
|
version is 4.2 or higher.
|
|
</para>
|
|
</refsect1>
|
|
<refsect1 id="errors"><title>Errors</title>
|
|
<para><constant>GL_INVALID_VALUE</constant> is generated if
|
|
<parameter>program</parameter> is not a value generated by
|
|
OpenGL.</para>
|
|
|
|
<para><constant>GL_INVALID_OPERATION</constant> is generated if
|
|
<parameter>program</parameter> is not a program object.</para>
|
|
|
|
<para><constant>GL_INVALID_VALUE</constant> is generated if
|
|
<parameter>index</parameter> is greater than or equal to the
|
|
number of active uniform variables in
|
|
<parameter>program</parameter>.</para>
|
|
|
|
<para><constant>GL_INVALID_VALUE</constant> is generated if
|
|
<parameter>bufSize</parameter> is less than 0.</para>
|
|
</refsect1>
|
|
<refsect1 id="associatedgets"><title>Associated Gets</title>
|
|
<para><citerefentry><refentrytitle>glGet</refentrytitle></citerefentry>
|
|
with argument <constant>GL_MAX_VERTEX_UNIFORM_COMPONENTS</constant>,
|
|
<constant>GL_MAX_GEOMETRY_UNIFORM_COMPONENTS</constant>,
|
|
<constant>GL_MAX_TESS_CONTROL_UNIFORM_COMPONENTS</constant>,
|
|
<constant>GL_MAX_TESS_EVALUATION_UNIFORM_COMPONENTS</constant>,
|
|
<constant>GL_MAX_FRAGMENT_UNIFORM_COMPONENTS</constant>.</para>
|
|
|
|
<para><citerefentry><refentrytitle>glGetProgram</refentrytitle></citerefentry>
|
|
with argument <constant>GL_ACTIVE_UNIFORMS</constant> or
|
|
<constant>GL_ACTIVE_UNIFORM_MAX_LENGTH</constant>.</para>
|
|
|
|
<para><citerefentry><refentrytitle>glIsProgram</refentrytitle></citerefentry></para>
|
|
</refsect1>
|
|
<refsect1 id="seealso"><title>See Also</title>
|
|
<para><citerefentry><refentrytitle>glGetUniform</refentrytitle></citerefentry>,
|
|
<citerefentry><refentrytitle>glGetUniformLocation</refentrytitle></citerefentry>,
|
|
<citerefentry><refentrytitle>glLinkProgram</refentrytitle></citerefentry>,
|
|
<citerefentry><refentrytitle>glUniform</refentrytitle></citerefentry>,
|
|
<citerefentry><refentrytitle>glUseProgram</refentrytitle></citerefentry></para>
|
|
</refsect1>
|
|
<refsect1 id="Copyright"><title>Copyright</title>
|
|
<para>
|
|
Copyright <trademark class="copyright"></trademark> 2003-2005 3Dlabs Inc. Ltd.
|
|
Copyright <trademark class="copyright"></trademark> 2010-2013 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.
|
|
<ulink url="http://opencontent.org/openpub/">http://opencontent.org/openpub/</ulink>.
|
|
</para>
|
|
</refsect1>
|
|
</refentry>
|