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<?xml version="1.0" encoding="UTF-8" standalone="no"?>
<!DOCTYPE html><html xmlns="http://www.w3.org/1999/xhtml">
<head>
<title>glValidateProgram - OpenGL 4 Reference Pages</title>
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<div class="refentry" id="glValidateProgram">
<div class="titlepage"/>
<div class="refnamediv">
<h2>Name</h2>
<p>glValidateProgram — Validates a program object</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">glValidateProgram</strong>(</code>
</td>
<td>GLuint <var class="pdparam">program</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>Specifies the handle of the program object to
be validated.</p>
</dd>
</dl>
</div>
</div>
<div class="refsect1" id="description">
<h2>Description</h2>
<p><code class="function">glValidateProgram</code> checks to see
whether the executables contained in
<em class="parameter"><code>program</code></em> can execute given the current
OpenGL state. The information generated by the validation
process will be stored in <em class="parameter"><code>program</code></em>'s
information log. The validation information may consist of an
empty string, or it may be a string containing information about
how the current program object interacts with the rest of
current OpenGL state. This provides a way for OpenGL
implementers to convey more information about why the current
program is inefficient, suboptimal, failing to execute, and so
on.</p>
<p>The status of the validation operation will be stored as
part of the program object's state. This value will be set to
<code class="constant">GL_TRUE</code> if the validation succeeded, and
<code class="constant">GL_FALSE</code> otherwise. It can be queried by
calling
<a class="citerefentry" href="glGetProgram.xhtml"><span class="citerefentry"><span class="refentrytitle">glGetProgram</span></span></a>
with arguments <em class="parameter"><code>program</code></em> and
<code class="constant">GL_VALIDATE_STATUS</code>. If validation is
successful, <em class="parameter"><code>program</code></em> is guaranteed to
execute given the current state. Otherwise,
<em class="parameter"><code>program</code></em> is guaranteed to not execute.</p>
<p>This function is typically useful only during application
development. The informational string stored in the information
log is completely implementation dependent; therefore, an
application should not expect different OpenGL implementations
to produce identical information strings.</p>
</div>
<div class="refsect1" id="notes">
<h2>Notes</h2>
<p>This function mimics the validation operation that OpenGL
implementations must perform when rendering commands are issued
while programmable shaders are part of current state. The error
<code class="constant">GL_INVALID_OPERATION</code> will be generated by
any command that triggers the rendering of geometry if:</p>
<div class="itemizedlist">
<ul class="itemizedlist" style="list-style-type: disc; ">
<li class="listitem">
<p>any two active samplers in the current program
object are of different types, but refer to the same
texture image unit,</p>
</li>
<li class="listitem">
<p>the number of active samplers in the program exceeds the maximum
number of texture image units allowed.</p>
</li>
</ul>
</div>
<p>It may be difficult or cause a performance degradation for
applications to catch these errors when rendering commands are
issued. Therefore, applications are advised to make calls to
<code class="function">glValidateProgram</code> to detect these issues
during application development.</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>program</code></em> is not a value generated by
OpenGL.</p>
<p><code class="constant">GL_INVALID_OPERATION</code> is generated if
<em class="parameter"><code>program</code></em> is not a program object.</p>
</div>
<div class="refsect1" id="associatedgets">
<h2>Associated Gets</h2>
<p><a class="citerefentry" href="glGetProgram.xhtml"><span class="citerefentry"><span class="refentrytitle">glGetProgram</span></span></a>
with arguments <em class="parameter"><code>program</code></em> and
<code class="constant">GL_VALIDATE_STATUS</code></p>
<p><a class="citerefentry" href="glGetProgramInfoLog.xhtml"><span class="citerefentry"><span class="refentrytitle">glGetProgramInfoLog</span></span></a>
with argument <em class="parameter"><code>program</code></em></p>
<p>
<a class="citerefentry" href="glIsProgram.xhtml">
<span class="citerefentry">
<span class="refentrytitle">glIsProgram</span>
</span>
</a>
</p>
</div>
<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; "/>
<col style="text-align: center; "/>
<col style="text-align: center; "/>
<col style="text-align: center; "/>
<col style="text-align: center; "/>
<col style="text-align: center; "/>
<col style="text-align: center; "/>
<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">glValidateProgram</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="glLinkProgram.xhtml"><span class="citerefentry"><span class="refentrytitle">glLinkProgram</span></span></a>,
<a class="citerefentry" href="glUseProgram.xhtml"><span class="citerefentry"><span class="refentrytitle">glUseProgram</span></span></a></p>
</div>
<div class="refsect1" id="Copyright">
<h2>Copyright</h2>
<p>
Copyright <span class="trademark"/>© 2003-2005 3Dlabs Inc. Ltd.
Copyright <span class="trademark"/>© 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="http://opencontent.org/openpub/" target="_top">http://opencontent.org/openpub/</a>.
</p>
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