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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>glGetProgramStage - OpenGL 4 Reference Pages</title>
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<div class="refentry" id="glGetProgramStage">
<div class="titlepage"/>
<div class="refnamediv">
<h2>Name</h2>
<p>glGetProgramStage — retrieve properties of a program object corresponding to a specified shader stage</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">glGetProgramStageiv</strong>(</code>
</td>
<td>GLuint <var class="pdparam">program</var>, </td>
</tr>
<tr>
<td> </td>
<td>GLenum <var class="pdparam">shadertype</var>, </td>
</tr>
<tr>
<td> </td>
<td>GLenum <var class="pdparam">pname</var>, </td>
</tr>
<tr>
<td> </td>
<td>GLint *<var class="pdparam">values</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 name of the program containing shader stage.
</p>
</dd>
<dt>
<span class="term">
<em class="parameter">
<code>shadertype</code>
</em>
</span>
</dt>
<dd>
<p>
Specifies the shader stage from which to query for the subroutine parameter. <em class="parameter"><code>shadertype</code></em>
must be one of <code class="constant">GL_VERTEX_SHADER</code>, <code class="constant">GL_TESS_CONTROL_SHADER</code>,
<code class="constant">GL_TESS_EVALUATION_SHADER</code>, <code class="constant">GL_GEOMETRY_SHADER</code> or
<code class="constant">GL_FRAGMENT_SHADER</code>.
</p>
</dd>
<dt>
<span class="term">
<em class="parameter">
<code>pname</code>
</em>
</span>
</dt>
<dd>
<p>
Specifies the parameter of the shader to query. <em class="parameter"><code>pname</code></em>
must be <code class="constant">GL_ACTIVE_SUBROUTINE_UNIFORMS</code>,
<code class="constant">GL_ACTIVE_SUBROUTINE_UNIFORM_LOCATIONS</code>,
<code class="constant">GL_ACTIVE_SUBROUTINES</code>,
<code class="constant">GL_ACTIVE_SUBROUTINE_UNIFORM_MAX_LENGTH</code>,
or <code class="constant">GL_ACTIVE_SUBROUTINE_MAX_LENGTH</code>.
</p>
</dd>
<dt>
<span class="term">
<em class="parameter">
<code>values</code>
</em>
</span>
</dt>
<dd>
<p>
Specifies the address of a variable into which the queried value or values will be placed.
</p>
</dd>
</dl>
</div>
</div>
<div class="refsect1" id="description">
<h2>Description</h2>
<p>
<code class="function">glGetProgramStage</code> queries a parameter of a shader stage attached to a program object.
<em class="parameter"><code>program</code></em> contains the name of the program to which the shader is attached. <em class="parameter"><code>shadertype</code></em>
specifies the stage from which to query the parameter. <em class="parameter"><code>pname</code></em> specifies which parameter
should be queried. The value or values of the parameter to be queried is returned in the variable whose address
is given in <em class="parameter"><code>values</code></em>.
</p>
<p>
If <em class="parameter"><code>pname</code></em> is <code class="constant">GL_ACTIVE_SUBROUTINE_UNIFORMS</code>, the number
of active subroutine variables in the stage is returned in <em class="parameter"><code>values</code></em>.
</p>
<p>
If <em class="parameter"><code>pname</code></em> is <code class="constant">GL_ACTIVE_SUBROUTINE_UNIFORM_LOCATIONS</code>,
the number of active subroutine variable locations in the stage is returned in <em class="parameter"><code>values</code></em>.
</p>
<p>
If <em class="parameter"><code>pname</code></em> is <code class="constant">GL_ACTIVE_SUBROUTINES</code>,
the number of active subroutines in the stage is returned in <em class="parameter"><code>values</code></em>.
</p>
<p>
If <em class="parameter"><code>pname</code></em> is <code class="constant">GL_ACTIVE_SUBROUTINE_UNIFORM_MAX_LENGTH</code>,
the length of the longest subroutine uniform for the stage is returned in <em class="parameter"><code>values</code></em>.
</p>
<p>
If <em class="parameter"><code>pname</code></em> is <code class="constant">GL_ACTIVE_SUBROUTINE_MAX_LENGTH</code>,
the length of the longest subroutine name for the stage is returned in <em class="parameter"><code>values</code></em>. The
returned name length includes space for the null-terminator.
</p>
<p>
If there is no shader present of type <em class="parameter"><code>shadertype</code></em>, the returned value will be consistent
with a shader containing no subroutines or subroutine uniforms.
</p>
</div>
<div class="refsect1" id="errors">
<h2>Errors</h2>
<p>
<code class="constant">GL_INVALID_ENUM</code> is generated if <em class="parameter"><code>shadertype</code></em> or <em class="parameter"><code>pname</code></em>
is not one of the accepted values.
</p>
<p>
<code class="constant">GL_INVALID_VALUE</code> is generated if <em class="parameter"><code>program</code></em> is not the name of an
existing program object.
</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; "/>
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<col style="text-align: center; "/>
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<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">glGetProgramStageiv</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="glGetProgram.xhtml"><span class="citerefentry"><span class="refentrytitle">glGetProgram</span></span></a>
</p>
</div>
<div class="refsect1" id="Copyright">
<h2>Copyright</h2>
<p>
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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