<div class="refentry" id="glBindFragDataLocation">

<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 style="border: 0; cellspacing: 0; cellpadding: 0;" class="funcprototype-table">

<tr>

<td>

<code class="funcdef">void <strong class="fsfunc">glBindFragDataLocation</strong>(</code>

</td>

<td>GLuint <var class="pdparam">program</var>, </td>

</tr>

<tr>

<td> </td>

<td>GLuint <var class="pdparam">colorNumber</var>, </td>

</tr>

<tr>

<td> </td>

<td>const char * <var class="pdparam">name</var><code>)</code>;</td>

</tr>

</table>

<div class="funcprototype-spacer"> </div>

</div>

</div>

<div class="refsect1" id="parameters">

<h2>Parameters</h2>

<div class="variablelist">

<dl class="variablelist">

<dt>

<span class="term">

<em class="parameter">

<code>program</code>

</em>

</span>

</dt>

<dd>

<p>

The name of the program containing varying out variable whose binding to modify

</p>

</dd>

<dt>

<span class="term">

<em class="parameter">

<code>colorNumber</code>

</em>

</span>

</dt>

<dd>

<p>

The color number to bind the user-defined varying out variable to

</p>

</dd>

<dt>

<span class="term">

<em class="parameter">

<code>name</code>

</em>

</span>

</dt>

<dd>

<p>

The name of the user-defined varying out variable whose binding to modify

</p>

</dd>

</dl>

</div>

</div>

<div class="refsect1" id="description">

<h2>Description</h2>

<p>

<code class="function">glBindFragDataLocation</code> explicitly specifies the binding of the user-defined varying out variable

<em class="parameter"><code>name</code></em> to fragment shader color number <em class="parameter"><code>colorNumber</code></em> for program

<em class="parameter"><code>program</code></em>. If <em class="parameter"><code>name</code></em> was bound previously, its assigned binding is replaced

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>

must be less than <code class="constant">GL_MAX_DRAW_BUFFERS</code>.

</p>

<p>

The bindings specified by <code class="function">glBindFragDataLocation</code> have no effect until <em class="parameter"><code>program</code></em>

is next linked. Bindings may be specified at any time after <em class="parameter"><code>program</code></em> has been created. Specifically,

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>,

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

reserved by the GL.

</p>

<p>

In addition to the errors generated by <code class="function">glBindFragDataLocation</code>, the

program <em class="parameter"><code>program</code></em> will fail to link if:

</p>

<div class="itemizedlist">

<ul class="itemizedlist" style="list-style-type: disc; ">

<li class="listitem">

<p>

The number of active outputs is greater than the value <code class="constant">GL_MAX_DRAW_BUFFERS</code>.

</p>

</li>

<li class="listitem">

<p>

More than one varying out variable is bound to the same color number.

</p>

</li>

</ul>

</div>

<p>

</p>

</div>

<div class="refsect1" id="notes">

<h2>Notes</h2>

<p>

Varying out varyings may have indexed locations assigned explicitly in the shader text using a <code class="code">location</code>

layout qualifier. If a shader statically assigns a location to a varying out variable in the shader text,

that location is used and any location assigned with <code class="function">glBindFragDataLocation</code> is ignored.

</p>

</div>

<div class="refsect1" id="errors">

<h2>Errors</h2>

<p>

<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>.

</p>

<p>

<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.

</p>

<p>

<code class="constant">GL_INVALID_OPERATION</code> is generated if <code class="function">program</code> is not the name of a program object.

</p>

</div>

<div class="refsect1" id="associatedgets">

<h2>Associated Gets</h2>

<p>

<a class="citerefentry" href="glGetFragDataLocation"><span class="citerefentry"><span class="refentrytitle">glGetFragDataLocation</span></span></a> with a valid program object

and the the name of a user-defined varying out variable

</p>

</div>

{$pipelinestall}{$examples}

<div class="refsect1" id="versions">

<h2>Version Support</h2>

<div class="informaltable">

<table style="border-collapse: collapse; border-top: 2px solid ; border-bottom: 2px solid ; border-left: 2px solid ; border-right: 2px solid ; ">

<colgroup>

<col style="text-align: left; "/>

<col style="text-align: center; " class="firstvers"/>

<col style="text-align: center; "/>

<col style="text-align: center; "/>

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<col style="text-align: center; "/>

<col style="text-align: center; "/>

<col style="text-align: center; " class="lastvers"/>

</colgroup>

<thead>

<tr>

<th style="text-align: left; border-right: 2px solid ; ">

</th>

<th style="text-align: center; border-bottom: 2px solid ; " colspan="12">

<span class="bold"><strong>OpenGL Version</strong></span>

</th>

</tr>

<tr>

<th style="text-align: left; border-right: 2px solid ; border-bottom: 2px solid ; ">

<span class="bold"><strong>Function / Feature Name</strong></span>

</th>

<th style="text-align: center; border-right: 2px solid ; border-bottom: 2px solid ; ">

<span class="bold"><strong>2.0</strong></span>

</th>

<th style="text-align: center; border-right: 2px solid ; border-bottom: 2px solid ; ">

<span class="bold"><strong>2.1</strong></span>

</th>

<th style="text-align: center; border-right: 2px solid ; border-bottom: 2px solid ; ">

<span class="bold"><strong>3.0</strong></span>

</th>

<th style="text-align: center; border-right: 2px solid ; border-bottom: 2px solid ; ">

<span class="bold"><strong>3.1</strong></span>

</th>

<th style="text-align: center; border-right: 2px solid ; border-bottom: 2px solid ; ">

<span class="bold"><strong>3.2</strong></span>

</th>

<th style="text-align: center; border-right: 2px solid ; border-bottom: 2px solid ; ">

<span class="bold"><strong>3.3</strong></span>

</th>

<th style="text-align: center; border-right: 2px solid ; border-bottom: 2px solid ; ">

<span class="bold"><strong>4.0</strong></span>

</th>

<th style="text-align: center; border-right: 2px solid ; border-bottom: 2px solid ; ">

<span class="bold"><strong>4.1</strong></span>

</th>

<th style="text-align: center; border-right: 2px solid ; border-bottom: 2px solid ; ">

<span class="bold"><strong>4.2</strong></span>

</th>

<th style="text-align: center; border-right: 2px solid ; border-bottom: 2px solid ; ">

<span class="bold"><strong>4.3</strong></span>

</th>

<th style="text-align: center; border-right: 2px solid ; border-bottom: 2px solid ; ">

<span class="bold"><strong>4.4</strong></span>

</th>

<th style="text-align: center; border-bottom: 2px solid ; ">

<span class="bold"><strong>4.5</strong></span>

</th>

</tr>

</thead>

<tbody>

<tr>

<td style="text-align: left; border-right: 2px solid ; ">

<code class="function">glBindFragDataLocation</code>

</td>

<td style="text-align: center; border-right: 2px solid ; ">-</td>

<td style="text-align: center; border-right: 2px solid ; ">-</td>

<td style="text-align: center; border-right: 2px solid ; ">✔</td>

<td style="text-align: center; border-right: 2px solid ; ">✔</td>

<td style="text-align: center; border-right: 2px solid ; ">✔</td>

<td style="text-align: center; border-right: 2px solid ; ">✔</td>

<td style="text-align: center; border-right: 2px solid ; ">✔</td>

<td style="text-align: center; border-right: 2px solid ; ">✔</td>

<td style="text-align: center; border-right: 2px solid ; ">✔</td>

<td style="text-align: center; border-right: 2px solid ; ">✔</td>

<td style="text-align: center; border-right: 2px solid ; ">✔</td>

<td style="text-align: center; ">✔</td>

</tr>

</tbody>

</table>

</div>

</div>

<div class="refsect1" id="seealso">

<h2>See Also</h2>

<p>

<a class="citerefentry" href="glCreateProgram"><span class="citerefentry"><span class="refentrytitle">glCreateProgram</span></span></a>,

<a class="citerefentry" href="glGetFragDataLocation"><span class="citerefentry"><span class="refentrytitle">glGetFragDataLocation</span></span></a>

</p>

</div>

<div class="refsect1" id="Copyright">

<h2>Copyright</h2>

<p>

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.

<a class="link" href="https://opencontent.org/openpub/" target="_top">https://opencontent.org/openpub/</a>.

</p>

</div>

</div>