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4 Reference Pages
</title><meta name=
"generator" content=
"DocBook XSL Stylesheets V1.69.1" /></head><body><div class=
"refentry" lang=
"en" xml:
lang=
"en"><a id=
"glGetFragDataIndex"></a><div class=
"titlepage"></div><div class=
"refnamediv"><h2>Name
</h2><p>glGetFragDataIndex — query the bindings of color indices to user-defined varying out variables
</p></div><div class=
"refsynopsisdiv"><h2>C Specification
</h2><div class=
"funcsynopsis"><table border=
"0" summary=
"Function synopsis" cellspacing=
"0" cellpadding=
"0"><tr><td><code class=
"funcdef">GLint
<b class=
"fsfunc">glGetFragDataIndex
</b>(
</code></td><td>GLuint
</td><td><var class=
"pdparam">program
</var>,
</td></tr><tr><td> </td><td>const char *
</td><td><var class=
"pdparam">name
</var><code>)
</code>;
</td></tr></table></div></div><div class=
"refsect1" lang=
"en" xml:
lang=
"en"><a id=
"parameters"></a><h2>Parameters
</h2><div class=
"variablelist"><dl><dt><span class=
"term"><em class=
"parameter"><code>program
</code></em></span></dt><dd><p>
5 The name of the program containing varying out variable whose binding to query
6 </p></dd><dt><span class=
"term"><em class=
"parameter"><code>name
</code></em></span></dt><dd><p>
7 The name of the user-defined varying out variable whose index to query
8 </p></dd></dl></div></div><div class=
"refsect1" lang=
"en" xml:
lang=
"en"><a id=
"description"></a><h2>Description
</h2><p>
9 <code class=
"function">glGetFragDataIndex
</code> returns the index of the fragment color to which the variable
<em class=
"parameter"><code>name
</code></em>
10 was bound when the program object
<em class=
"parameter"><code>program
</code></em> was last linked. If
<em class=
"parameter"><code>name
</code></em> is not a varying out
11 variable of
<em class=
"parameter"><code>program
</code></em>, or if an error occurs, -
1 will be returned.
12 </p></div><div class=
"refsect1" lang=
"en" xml:
lang=
"en"><a id=
"notes"></a><h2>Notes
</h2><p>
13 <code class=
"function">glGetFragDataIndex
</code> is available only if the GL version is
3.3 or greater.
14 </p></div><div class=
"refsect1" lang=
"en" xml:
lang=
"en"><a id=
"errors"></a><h2>Errors
</h2><p>
15 <code class=
"constant">GL_INVALID_OPERATION
</code> is generated if
<em class=
"parameter"><code>program
</code></em> is not the name of a program object.
16 </p></div><div class=
"refsect1" lang=
"en" xml:
lang=
"en"><a id=
"seealso"></a><h2>See Also
</h2><p>
17 <a href=
"glCreateProgram.xml"><span class=
"citerefentry"><span class=
"refentrytitle">glCreateProgram
</span></span></a>,
18 <a href=
"glBindFragDataLocation.xml"><span class=
"citerefentry"><span class=
"refentrytitle">glBindFragDataLocation
</span></span></a>,
19 <a href=
"glBindFragDataLocationIndexed.xml"><span class=
"citerefentry"><span class=
"refentrytitle">glBindFragDataLocationIndexed
</span></span></a>,
20 <a href=
"glGetFragDataLocation.xml"><span class=
"citerefentry"><span class=
"refentrytitle">glGetFragDataLocation
</span></span></a>
21 </p></div><div class=
"refsect1" lang=
"en" xml:
lang=
"en"><a id=
"Copyright"></a><h2>Copyright
</h2><p>
22 Copyright
<span class=
"trademark"></span>©
2010 Khronos Group.
23 This material may be distributed subject to the terms and conditions set forth in
24 the Open Publication License, v
1.0,
8 June
1999.
25 <a href=
"http://opencontent.org/openpub/" target=
"_top">http://opencontent.org/openpub/
</a>.
26 </p></div></div></body></html>
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