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glIsEnabled.xhtml
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glIsEnabled.xhtml
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<div class="refentry" id="glIsEnabled">
<div class="titlepage"></div>
<div class="refnamediv">
<h2>Name</h2>
<p>glIsEnabled, glIsEnabledi — test whether a capability is enabled</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">GLboolean <strong class="fsfunc">glIsEnabled</strong>(</code>
</td>
<td>GLenum <var class="pdparam">cap</var><code>)</code>;</td>
</tr>
</table>
<div class="funcprototype-spacer"> </div>
</div>
<div class="funcsynopsis">
<table style="border: 0; cellspacing: 0; cellpadding: 0;" class="funcprototype-table">
<tr>
<td>
<code class="funcdef">GLboolean <strong class="fsfunc">glIsEnabledi</strong>(</code>
</td>
<td>GLenum <var class="pdparam">cap</var>, </td>
</tr>
<tr>
<td> </td>
<td>GLuint <var class="pdparam">index</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>cap</code>
</em>
</span>
</dt>
<dd>
<p>
Specifies a symbolic constant indicating a GL capability.
</p>
</dd>
<dt>
<span class="term">
<em class="parameter">
<code>index</code>
</em>
</span>
</dt>
<dd>
<p>
Specifies the index of the capability.
</p>
</dd>
</dl>
</div>
</div>
<div class="refsect1" id="description">
<h2>Description</h2>
<p>
<code class="function">glIsEnabled</code> returns <code class="constant">GL_TRUE</code> if <em class="parameter"><code>cap</code></em> is an enabled capability
and returns <code class="constant">GL_FALSE</code> otherwise. Boolean states that are indexed may be tested with <code class="function">glIsEnabledi</code>.
For <code class="function">glIsEnabledi</code>, <em class="parameter"><code>index</code></em> specifies the index of the capability to test. <em class="parameter"><code>index</code></em>
must be between zero and the count of indexed capabilities for <em class="parameter"><code>cap</code></em>.
Initially all capabilities except <code class="constant">GL_DITHER</code> are disabled;
<code class="constant">GL_DITHER</code> is initially enabled.
</p>
<p>
The following capabilities are accepted for <em class="parameter"><code>cap</code></em>:
</p>
<p>
</p>
<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: left; "/>
</colgroup>
<thead>
<tr>
<th style="text-align: left; border-right: 2px solid ; border-bottom: 2px solid ; ">
<span class="bold"><strong> Constant </strong></span>
</th>
<th style="text-align: left; border-bottom: 2px solid ; ">
<span class="bold"><strong> See </strong></span>
</th>
</tr>
</thead>
<tbody>
<tr>
<td style="text-align: left; border-right: 2px solid ; border-bottom: 2px solid ; ">
<code class="constant">GL_BLEND</code>
</td>
<td style="text-align: left; border-bottom: 2px solid ; ">
<a class="citerefentry" href="glBlendFunc"><span class="citerefentry"><span class="refentrytitle">glBlendFunc</span></span></a>,
<a class="citerefentry" href="glLogicOp"><span class="citerefentry"><span class="refentrytitle">glLogicOp</span></span></a>
</td>
</tr>
<tr>
<td style="text-align: left; border-right: 2px solid ; border-bottom: 2px solid ; ">
<code class="constant">GL_CLIP_DISTANCE</code><span class="emphasis"><em>i</em></span>
</td>
<td style="text-align: left; border-bottom: 2px solid ; ">
<a class="citerefentry" href="glEnable"><span class="citerefentry"><span class="refentrytitle">glEnable</span></span></a>
</td>
</tr>
<tr>
<td style="text-align: left; border-right: 2px solid ; border-bottom: 2px solid ; ">
<code class="constant">GL_COLOR_LOGIC_OP</code>
</td>
<td style="text-align: left; border-bottom: 2px solid ; ">
<a class="citerefentry" href="glLogicOp"><span class="citerefentry"><span class="refentrytitle">glLogicOp</span></span></a>
</td>
</tr>
<tr>
<td style="text-align: left; border-right: 2px solid ; border-bottom: 2px solid ; ">
<code class="constant">GL_CULL_FACE</code>
</td>
<td style="text-align: left; border-bottom: 2px solid ; ">
<a class="citerefentry" href="glCullFace"><span class="citerefentry"><span class="refentrytitle">glCullFace</span></span></a>
</td>
</tr>
<tr>
<td style="text-align: left; border-right: 2px solid ; border-bottom: 2px solid ; ">
<code class="constant">GL_DEPTH_CLAMP</code>
</td>
<td style="text-align: left; border-bottom: 2px solid ; ">
<a class="citerefentry" href="glEnable"><span class="citerefentry"><span class="refentrytitle">glEnable</span></span></a>
</td>
</tr>
<tr>
<td style="text-align: left; border-right: 2px solid ; border-bottom: 2px solid ; ">
<code class="constant">GL_DEBUG_OUTPUT</code>
</td>
<td style="text-align: left; border-bottom: 2px solid ; ">
<a class="citerefentry" href="glEnable"><span class="citerefentry"><span class="refentrytitle">glEnable</span></span></a>
</td>
</tr>
<tr>
<td style="text-align: left; border-right: 2px solid ; border-bottom: 2px solid ; ">
<code class="constant">GL_DEBUG_OUTPUT_SYNCHRONOUS</code>
</td>
<td style="text-align: left; border-bottom: 2px solid ; ">
<a class="citerefentry" href="glEnable"><span class="citerefentry"><span class="refentrytitle">glEnable</span></span></a>
</td>
</tr>
<tr>
<td style="text-align: left; border-right: 2px solid ; border-bottom: 2px solid ; ">
<code class="constant">GL_DEPTH_TEST</code>
</td>
<td style="text-align: left; border-bottom: 2px solid ; ">
<a class="citerefentry" href="glDepthFunc"><span class="citerefentry"><span class="refentrytitle">glDepthFunc</span></span></a>,
<a class="citerefentry" href="glDepthRange"><span class="citerefentry"><span class="refentrytitle">glDepthRange</span></span></a>
</td>
</tr>
<tr>
<td style="text-align: left; border-right: 2px solid ; border-bottom: 2px solid ; ">
<code class="constant">GL_DITHER</code>
</td>
<td style="text-align: left; border-bottom: 2px solid ; ">
<a class="citerefentry" href="glEnable"><span class="citerefentry"><span class="refentrytitle">glEnable</span></span></a>
</td>
</tr>
<tr>
<td style="text-align: left; border-right: 2px solid ; border-bottom: 2px solid ; ">
<code class="constant">GL_FRAMEBUFFER_SRGB</code>
</td>
<td style="text-align: left; border-bottom: 2px solid ; ">
<a class="citerefentry" href="glEnable"><span class="citerefentry"><span class="refentrytitle">glEnable</span></span></a>
</td>
</tr>
<tr>
<td style="text-align: left; border-right: 2px solid ; border-bottom: 2px solid ; ">
<code class="constant">GL_LINE_SMOOTH</code>
</td>
<td style="text-align: left; border-bottom: 2px solid ; ">
<a class="citerefentry" href="glLineWidth"><span class="citerefentry"><span class="refentrytitle">glLineWidth</span></span></a>
</td>
</tr>
<tr>
<td style="text-align: left; border-right: 2px solid ; border-bottom: 2px solid ; ">
<code class="constant">GL_MULTISAMPLE</code>
</td>
<td style="text-align: left; border-bottom: 2px solid ; ">
<a class="citerefentry" href="glSampleCoverage"><span class="citerefentry"><span class="refentrytitle">glSampleCoverage</span></span></a>
</td>
</tr>
<tr>
<td style="text-align: left; border-right: 2px solid ; border-bottom: 2px solid ; ">
<code class="constant">GL_POLYGON_SMOOTH</code>
</td>
<td style="text-align: left; border-bottom: 2px solid ; ">
<a class="citerefentry" href="glPolygonMode"><span class="citerefentry"><span class="refentrytitle">glPolygonMode</span></span></a>
</td>
</tr>
<tr>
<td style="text-align: left; border-right: 2px solid ; border-bottom: 2px solid ; ">
<code class="constant">GL_POLYGON_OFFSET_FILL</code>
</td>
<td style="text-align: left; border-bottom: 2px solid ; ">
<a class="citerefentry" href="glPolygonOffset"><span class="citerefentry"><span class="refentrytitle">glPolygonOffset</span></span></a>
</td>
</tr>
<tr>
<td style="text-align: left; border-right: 2px solid ; border-bottom: 2px solid ; ">
<code class="constant">GL_POLYGON_OFFSET_LINE</code>
</td>
<td style="text-align: left; border-bottom: 2px solid ; ">
<a class="citerefentry" href="glPolygonOffset"><span class="citerefentry"><span class="refentrytitle">glPolygonOffset</span></span></a>
</td>
</tr>
<tr>
<td style="text-align: left; border-right: 2px solid ; border-bottom: 2px solid ; ">
<code class="constant">GL_POLYGON_OFFSET_POINT</code>
</td>
<td style="text-align: left; border-bottom: 2px solid ; ">
<a class="citerefentry" href="glPolygonOffset"><span class="citerefentry"><span class="refentrytitle">glPolygonOffset</span></span></a>
</td>
</tr>
<tr>
<td style="text-align: left; border-right: 2px solid ; border-bottom: 2px solid ; ">
<code class="constant">GL_PROGRAM_POINT_SIZE</code>
</td>
<td style="text-align: left; border-bottom: 2px solid ; ">
<a class="citerefentry" href="glEnable"><span class="citerefentry"><span class="refentrytitle">glEnable</span></span></a>
</td>
</tr>
<tr>
<td style="text-align: left; border-right: 2px solid ; border-bottom: 2px solid ; ">
<code class="constant">GL_PRIMITIVE_RESTART</code>
</td>
<td style="text-align: left; border-bottom: 2px solid ; ">
<a class="citerefentry" href="glEnable"><span class="citerefentry"><span class="refentrytitle">glEnable</span></span></a>,
<a class="citerefentry" href="glPrimitiveRestartIndex"><span class="citerefentry"><span class="refentrytitle">glPrimitiveRestartIndex</span></span></a>
</td>
</tr>
<tr>
<td style="text-align: left; border-right: 2px solid ; border-bottom: 2px solid ; ">
<code class="constant">GL_SAMPLE_ALPHA_TO_COVERAGE</code>
</td>
<td style="text-align: left; border-bottom: 2px solid ; ">
<a class="citerefentry" href="glSampleCoverage"><span class="citerefentry"><span class="refentrytitle">glSampleCoverage</span></span></a>
</td>
</tr>
<tr>
<td style="text-align: left; border-right: 2px solid ; border-bottom: 2px solid ; ">
<code class="constant">GL_SAMPLE_ALPHA_TO_ONE</code>
</td>
<td style="text-align: left; border-bottom: 2px solid ; ">
<a class="citerefentry" href="glSampleCoverage"><span class="citerefentry"><span class="refentrytitle">glSampleCoverage</span></span></a>
</td>
</tr>
<tr>
<td style="text-align: left; border-right: 2px solid ; border-bottom: 2px solid ; ">
<code class="constant">GL_SAMPLE_COVERAGE</code>
</td>
<td style="text-align: left; border-bottom: 2px solid ; ">
<a class="citerefentry" href="glSampleCoverage"><span class="citerefentry"><span class="refentrytitle">glSampleCoverage</span></span></a>
</td>
</tr>
<tr>
<td style="text-align: left; border-right: 2px solid ; border-bottom: 2px solid ; ">
<code class="constant">GL_SAMPLE_MASK</code>
</td>
<td style="text-align: left; border-bottom: 2px solid ; ">
<a class="citerefentry" href="glEnable"><span class="citerefentry"><span class="refentrytitle">glEnable</span></span></a>
</td>
</tr>
<tr>
<td style="text-align: left; border-right: 2px solid ; border-bottom: 2px solid ; ">
<code class="constant">GL_SCISSOR_TEST</code>
</td>
<td style="text-align: left; border-bottom: 2px solid ; ">
<a class="citerefentry" href="glScissor"><span class="citerefentry"><span class="refentrytitle">glScissor</span></span></a>
</td>
</tr>
<tr>
<td style="text-align: left; border-right: 2px solid ; border-bottom: 2px solid ; ">
<code class="constant">GL_STENCIL_TEST</code>
</td>
<td style="text-align: left; border-bottom: 2px solid ; ">
<a class="citerefentry" href="glStencilFunc"><span class="citerefentry"><span class="refentrytitle">glStencilFunc</span></span></a>,
<a class="citerefentry" href="glStencilOp"><span class="citerefentry"><span class="refentrytitle">glStencilOp</span></span></a>
</td>
</tr>
<tr>
<td style="text-align: left; border-right: 2px solid ; ">
<code class="constant">GL_TEXTURE_CUBE_MAP_SEAMLESS</code>
</td>
<td style="text-align: left; ">
<a class="citerefentry" href="glEnable"><span class="citerefentry"><span class="refentrytitle">glEnable</span></span></a>
</td>
</tr>
</tbody>
</table>
</div>
<p>
</p>
</div>
<div class="refsect1" id="notes">
<h2>Notes</h2>
<p>
If an error is generated,
<code class="function">glIsEnabled</code> and <code class="function">glIsEnabledi</code> return <code class="constant">GL_FALSE</code>.
</p>
<p>
<code class="constant">GL_DEBUG_OUTPUT</code> and <code class="constant">GL_DEBUG_OUTPUT_SYNCHRONOUS</code> are available only if the GL version is 4.3 or greater.
</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>cap</code></em> is not an accepted value.
</p>
<p>
<code class="constant">GL_INVALID_VALUE</code> is generated by <code class="function">glIsEnabledi</code> if <em class="parameter"><code>index</code></em> is outside the
valid range for the indexed state <em class="parameter"><code>cap</code></em>.
</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; "/>
<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 ; border-bottom: 2px solid ; ">
<code class="function">glIsEnabled</code>
</td>
<td style="text-align: center; border-right: 2px solid ; border-bottom: 2px solid ; ">✔</td>
<td style="text-align: center; border-right: 2px solid ; border-bottom: 2px solid ; ">✔</td>
<td style="text-align: center; border-right: 2px solid ; border-bottom: 2px solid ; ">✔</td>
<td style="text-align: center; border-right: 2px solid ; border-bottom: 2px solid ; ">✔</td>
<td style="text-align: center; border-right: 2px solid ; border-bottom: 2px solid ; ">✔</td>
<td style="text-align: center; border-right: 2px solid ; border-bottom: 2px solid ; ">✔</td>
<td style="text-align: center; border-right: 2px solid ; border-bottom: 2px solid ; ">✔</td>
<td style="text-align: center; border-right: 2px solid ; border-bottom: 2px solid ; ">✔</td>
<td style="text-align: center; border-right: 2px solid ; border-bottom: 2px solid ; ">✔</td>
<td style="text-align: center; border-right: 2px solid ; border-bottom: 2px solid ; ">✔</td>
<td style="text-align: center; border-right: 2px solid ; border-bottom: 2px solid ; ">✔</td>
<td style="text-align: center; border-bottom: 2px solid ; ">✔</td>
</tr>
<tr>
<td style="text-align: left; border-right: 2px solid ; ">
<code class="function">glIsEnabledi</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="glEnable"><span class="citerefentry"><span class="refentrytitle">glEnable</span></span></a>,
<a class="citerefentry" href="glDisable"><span class="citerefentry"><span class="refentrytitle">glDisable</span></span></a>,
<a class="citerefentry" href="glGet"><span class="citerefentry"><span class="refentrytitle">glGet</span></span></a>
</p>
</div>
<div class="refsect1" id="Copyright">
<h2>Copyright</h2>
<p>
Copyright © 1991-2006 Silicon Graphics, Inc.
Copyright © 2010-2014 Khronos Group.
This document is licensed under the SGI
Free Software B License. For details, see
<a class="link" href="http://oss.sgi.com/projects/FreeB/" target="_top">http://oss.sgi.com/projects/FreeB/</a>.
</p>
</div>
</div>