mirror of
https://github.com/Ryujinx/Opentk.git
synced 2024-12-29 11:15:38 +00:00
163 lines
7.7 KiB
XML
163 lines
7.7 KiB
XML
<!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="glGetUniformLocation">
|
|
<info>
|
|
<copyright>
|
|
<year>2003-2005</year>
|
|
<holder>3Dlabs Inc. Ltd.</holder>
|
|
</copyright>
|
|
<copyright>
|
|
<year>2010-2014</year>
|
|
<holder>Khronos Group</holder>
|
|
</copyright>
|
|
</info>
|
|
<refmeta>
|
|
<refentrytitle>glGetUniformLocation</refentrytitle>
|
|
<manvolnum>3G</manvolnum>
|
|
</refmeta>
|
|
<refnamediv>
|
|
<refname>glGetUniformLocation</refname>
|
|
<refpurpose>Returns the location of a uniform variable</refpurpose>
|
|
</refnamediv>
|
|
<refsynopsisdiv><title>C Specification</title>
|
|
<funcsynopsis>
|
|
<funcprototype>
|
|
<funcdef>GLint <function>glGetUniformLocation</function></funcdef>
|
|
<paramdef>GLuint <parameter>program</parameter></paramdef>
|
|
<paramdef>const GLchar *<parameter>name</parameter></paramdef>
|
|
</funcprototype>
|
|
</funcsynopsis>
|
|
</refsynopsisdiv>
|
|
<refsect1 xml:id="parameters"><title>Parameters</title>
|
|
<variablelist>
|
|
<varlistentry>
|
|
<term><parameter>program</parameter></term>
|
|
<listitem>
|
|
<para>Specifies the program object to be
|
|
queried.</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term><parameter>name</parameter></term>
|
|
<listitem>
|
|
<para>Points to a null terminated string containing
|
|
the name of the uniform variable whose location is
|
|
to be queried.</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
</variablelist>
|
|
</refsect1>
|
|
<refsect1 xml:id="description"><title>Description</title>
|
|
<para><function>glGetUniformLocation </function> returns an
|
|
integer that represents the location of a specific uniform
|
|
variable within a the default uniform block of a program object.
|
|
<parameter>name</parameter> must be a null terminated string
|
|
that contains no white space. <parameter>name</parameter> must
|
|
be an active uniform variable name in <parameter>program</parameter>
|
|
that is not a structure, an array of structures, or a subcomponent
|
|
of a vector or a matrix. This function returns -1 if
|
|
<parameter>name</parameter> does not correspond to an active uniform variable in
|
|
<parameter>program</parameter> or if <parameter>name</parameter>
|
|
is associated with a named uniform block.
|
|
</para>
|
|
|
|
<para>Uniform variables that are structures or arrays of
|
|
structures may be queried by calling
|
|
<function>glGetUniformLocation</function> for each field within
|
|
the structure. The array element operator "[]" and the
|
|
structure field operator "." may be used in
|
|
<parameter>name</parameter> in order to select elements within
|
|
an array or fields within a structure. The result of using these
|
|
operators is not allowed to be another structure, an array of
|
|
structures, or a subcomponent of a vector or a matrix.
|
|
The first element of a uniform array is identified using the name
|
|
of the uniform array appended with "[0]". If the last part
|
|
of the string name indicates a uniform array, then the location of the
|
|
first element of that array can be retrieved by either using the name of
|
|
the array, or by using the name appended by "[0]".</para>
|
|
|
|
<para>
|
|
Locations for sequential array indices are not required to be sequential. The
|
|
location for "a[1]" may or may not be equal to the location for
|
|
"a[0]" + 1. Furthermore, since unused elements at the end of uniform
|
|
arrays may be trimmed the location of the i + 1 array element may not be valid
|
|
even if the location of the i element is valid. As a direct consequence, the
|
|
value of the location of "a[0]" + 1 may refer to a different uniform
|
|
entirely. Applications that wish to set individual array elements should query
|
|
the locations of each element separately.
|
|
</para>
|
|
|
|
<para>The actual locations assigned to uniform variables are not
|
|
known until the program object is linked successfully. After
|
|
linking has occurred, the command
|
|
<function>glGetUniformLocation</function> can be used to obtain
|
|
the location of a uniform variable. This location value can then
|
|
be passed to
|
|
<citerefentry><refentrytitle>glUniform</refentrytitle></citerefentry>
|
|
to set the value of the uniform variable or to
|
|
<citerefentry><refentrytitle>glGetUniform</refentrytitle></citerefentry>
|
|
in order to query the current value of the uniform variable.
|
|
After a program object has been linked successfully, the index
|
|
values for uniform variables remain fixed until the next link
|
|
command occurs. Uniform variable locations and values can only
|
|
be queried after a link if the link was successful.</para>
|
|
</refsect1>
|
|
<refsect1 xml: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_OPERATION</constant> is generated if
|
|
<parameter>program</parameter> has not been successfully
|
|
linked.</para>
|
|
|
|
</refsect1>
|
|
<refsect1 xml:id="associatedgets"><title>Associated Gets</title>
|
|
<para><citerefentry><refentrytitle>glGetActiveUniform</refentrytitle></citerefentry>
|
|
with arguments <parameter>program</parameter> and the index of
|
|
an active uniform variable</para>
|
|
|
|
<para><citerefentry><refentrytitle>glGetProgramiv</refentrytitle></citerefentry>
|
|
with arguments <parameter>program</parameter> and
|
|
<constant>GL_ACTIVE_UNIFORMS</constant> or
|
|
<constant>GL_ACTIVE_UNIFORM_MAX_LENGTH</constant></para>
|
|
|
|
<para><citerefentry><refentrytitle>glGetUniform</refentrytitle></citerefentry>
|
|
with arguments <parameter>program</parameter> and the name of a
|
|
uniform variable</para>
|
|
<para><citerefentry><refentrytitle>glIsProgram</refentrytitle></citerefentry></para>
|
|
</refsect1>
|
|
<refsect1 xml:id="versions">
|
|
<title>API Version Support</title>
|
|
<informaltable>
|
|
<tgroup cols="3" align="left">
|
|
<xi:include xmlns:xi="http://www.w3.org/2001/XInclude" href="apifunchead.xml" xpointer="xpointer(/*/*)"/>
|
|
<tbody>
|
|
<row>
|
|
<entry>glGetUniformLocation</entry>
|
|
<xi:include xmlns:xi="http://www.w3.org/2001/XInclude" href="apiversion.xml" xpointer="xpointer(/*/*[@role='es20']/*)"/>
|
|
</row>
|
|
</tbody>
|
|
</tgroup>
|
|
</informaltable>
|
|
</refsect1>
|
|
<refsect1 xml:id="seealso"><title>See Also</title>
|
|
<para><citerefentry><refentrytitle>glLinkProgram</refentrytitle></citerefentry>,
|
|
<citerefentry><refentrytitle>glUniform</refentrytitle></citerefentry></para>
|
|
</refsect1>
|
|
<refsect1 xml:id="Copyright"><title>Copyright</title>
|
|
<para>
|
|
Copyright <trademark class="copyright"/> 2003-2005 3Dlabs Inc. Ltd.
|
|
Copyright <trademark class="copyright"/> 2010-2014 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>
|