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"text/css" href=
"opengl-man.css" /><title>glBindFragDataLocation
</title><meta name=
"generator" content=
"DocBook XSL Stylesheets V1.69.1" /></head><body><div class=
"refentry" lang=
"en" xml:
lang=
"en"><a id=
"glBindFragDataLocation"></a><div class=
"titlepage"></div><div class=
"refnamediv"><h2>Name
</h2><p>glBindFragDataLocation — bind a user-defined varying out variable to a fragment shader color number
</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">void
<b class=
"fsfunc">glBindFragDataLocation
</b>(
</code></td><td>GLuint
</td><td><var class=
"pdparam">program
</var>,
</td></tr><tr><td> </td><td>GLuint
</td><td><var class=
"pdparam">colorNumber
</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 modify
6 </p></dd><dt><span class=
"term"><em class=
"parameter"><code>colorNumber
</code></em></span></dt><dd><p>
7 The color number to bind the user-defined varying out variable to
8 </p></dd><dt><span class=
"term"><em class=
"parameter"><code>name
</code></em></span></dt><dd><p>
9 The name of the user-defined varying out variable whose binding to modify
10 </p></dd></dl></div></div><div class=
"refsect1" lang=
"en" xml:
lang=
"en"><a id=
"description"></a><h2>Description
</h2><p>
11 <code class=
"function">glBindFragDataLocation
</code> explicitly specifies the binding of the user-defined varying out variable
12 <em class=
"parameter"><code>name
</code></em> to fragment shader color number
<em class=
"parameter"><code>colorNumber
</code></em> for program
13 <em class=
"parameter"><code>program
</code></em>. If
<em class=
"parameter"><code>name
</code></em> was bound previously, its assigned binding is replaced
14 with
<em class=
"parameter"><code>colorNumber
</code></em>.
<em class=
"parameter"><code>name
</code></em> must be a null-terminated string.
<em class=
"parameter"><code>colorNumber
</code></em>
15 must be less than
<code class=
"constant">GL_MAX_DRAW_BUFFERS
</code>.
17 The bindings specified by
<code class=
"function">glBindFragDataLocation
</code> have no effect until
<em class=
"parameter"><code>program
</code></em>
18 is next linked. Bindings may be specified at any time after
<em class=
"parameter"><code>program
</code></em> has been created. Specifically,
19 they may be specified before shader objects are attached to the program. Therefore, any name may be specified in
<em class=
"parameter"><code>name
</code></em>,
20 including a name that is never used as a varying out variable in any fragment shader object. Names beginning with
<code class=
"constant">gl_
</code> are
23 In addition to the errors generated by
<code class=
"function">glBindFragDataLocation
</code>, the
24 program
<em class=
"parameter"><code>program
</code></em> will fail to link if:
25 </p><div class=
"itemizedlist"><ul type=
"disc"><li><p>
26 The number of active outputs is greater than the value
<code class=
"constant">GL_MAX_DRAW_BUFFERS
</code>.
28 More than one varying out variable is bound to the same color number.
29 </p></li></ul></div><p>
30 </p></div><div class=
"refsect1" lang=
"en" xml:
lang=
"en"><a id=
"notes"></a><h2>Notes
</h2><p>
31 Varying out varyings may have indexed locations assigned explicitly in the shader text using a
<code class=
"code">location
</code>
32 layout qualifier. If a shader statically assigns a location to a varying out variable in the shader text,
33 that location is used and any location assigned with
<code class=
"function">glBindFragDataLocation
</code> is ignored.
34 </p></div><div class=
"refsect1" lang=
"en" xml:
lang=
"en"><a id=
"errors"></a><h2>Errors
</h2><p>
35 <code class=
"constant">GL_INVALID_VALUE
</code> is generated if
<em class=
"parameter"><code>colorNumber
</code></em> is greater than or equal to
<code class=
"constant">GL_MAX_DRAW_BUFFERS
</code>.
37 <code class=
"constant">GL_INVALID_OPERATION
</code> is generated if
<em class=
"parameter"><code>name
</code></em> starts with the reserved
<code class=
"constant">gl_
</code> prefix.
39 <code class=
"constant">GL_INVALID_OPERATION
</code> is generated if
<code class=
"function">program
</code> is not the name of a program object.
40 </p></div><div class=
"refsect1" lang=
"en" xml:
lang=
"en"><a id=
"associatedgets"></a><h2>Associated Gets
</h2><p>
41 <a href=
"glGetFragDataLocation.xml"><span class=
"citerefentry"><span class=
"refentrytitle">glGetFragDataLocation
</span></span></a> with a valid program object
42 and the the name of a user-defined varying out variable
43 </p></div><div class=
"refsect1" lang=
"en" xml:
lang=
"en"><a id=
"seealso"></a><h2>See Also
</h2><p>
44 <a href=
"glCreateProgram.xml"><span class=
"citerefentry"><span class=
"refentrytitle">glCreateProgram
</span></span></a>,
45 <a href=
"glGetFragDataLocation.xml"><span class=
"citerefentry"><span class=
"refentrytitle">glGetFragDataLocation
</span></span></a>
46 </p></div><div class=
"refsect1" lang=
"en" xml:
lang=
"en"><a id=
"Copyright"></a><h2>Copyright
</h2><p>
47 Copyright
<span class=
"trademark"></span>©
2010 Khronos Group.
48 This material may be distributed subject to the terms and conditions set forth in
49 the Open Publication License, v
1.0,
8 June
1999.
50 <a href=
"http://opencontent.org/openpub/" target=
"_top">http://opencontent.org/openpub/
</a>.
51 </p></div></div></body></html>