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

<div class="titlepage"></div>

<div class="refnamediv">

<h2>Name</h2>

<p>glGenerateMipmap — generate mipmaps for a specified texture target</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">glGenerateMipmap</strong>(</code>

</td>

<td>GLenum <var class="pdparam">target</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>target</code>

</em>

</span>

</dt>

<dd>

<p>

Specifies the target to which the texture whose mimaps to generate is bound. <em class="parameter"><code>target</code></em> must

be <code class="constant">GL_TEXTURE_2D</code>, <code class="constant">GL_TEXTURE_3D</code>,

<code class="constant">GL_TEXTURE_2D_ARRAY</code> or <code class="constant">GL_TEXTURE_CUBE_MAP</code>.

</p>

</dd>

</dl>

</div>

</div>

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

<h2>Description</h2>

<p>

<code class="function">glGenerateMipmap</code> generates mipmaps for the texture attached

to <em class="parameter"><code>target</code></em> of the active texture unit. For cube map textures,

a <code class="constant">GL_INVALID_OPERATION</code> error is generated if the texture

attached to <em class="parameter"><code>target</code></em> is not cube complete.

</p>

<p>

Mipmap generation replaces texel array levels

<math overflow="scroll">

<mrow>

<msub>

<mi mathvariant="italic">level</mi>

<mi>base</mi>

</msub>

<mo>+</mo>

<mn>1</mn>

</mrow>

</math>

through

<math overflow="scroll">

<mrow>

<mi mathvariant="italic">q</mi>

</mrow>

</math>

with arrays derived from the

<math overflow="scroll">

<mrow>

<msub>

<mi mathvariant="italic">level</mi>

<mi>base</mi>

</msub>

</mrow>

</math>

array, regardless of their previous contents. All other mimap arrays,

including the

<math overflow="scroll">

<mrow>

<msub>

<mi mathvariant="italic">level</mi>

<mi>base</mi>

</msub>

</mrow>

</math>

array, are left unchanged by this computation.

</p>

<p>

The internal formats of the derived mipmap arrays all match those of the

<math overflow="scroll">

<mrow>

<msub>

<mi mathvariant="italic">level</mi>

<mi>base</mi>

</msub>

</mrow>

</math>

array. The contents of the derived arrays are computed by repeated, filtered

reduction of the

<math overflow="scroll">

<mrow>

<msub>

<mi mathvariant="italic">level</mi>

<mi>base</mi>

</msub>

</mrow>

</math>

array. For two-dimensional texture arrays, each layer is filtered

independently.

</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>target</code></em> is not

one of the accepted texture targets.

</p>

<p>

<code class="constant">GL_INVALID_OPERATION</code> is generated if <em class="parameter"><code>target</code></em> is

<code class="constant">GL_TEXTURE_CUBE_MAP</code> and the texture bound to the <code class="constant">GL_TEXTURE_CUBE_MAP</code>

target of the active texture unit is not cube complete.

</p>

<p>

<code class="constant">GL_INVALID_OPERATION</code> is generated if the

<math overflow="scroll">

<mrow>

<msub>

<mi mathvariant="italic">level</mi>

<mi>base</mi>

</msub>

</mrow>

</math>

array is stored in a compressed internal format.

</p>

<p>

<code class="constant">GL_INVALID_OPERATION</code> is generated if the

<math overflow="scroll">

<mrow>

<msub>

<mi mathvariant="italic">level</mi>

<mi>base</mi>

</msub>

</mrow>

</math>

array was not specified with an unsized internal format or a sized internal format that is both

color-renderable and texture-filterable.

</p>

</div>

{$pipelinestall}{$examples}

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

<h2>API 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; " 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="3">

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

</th>

</tr>

<tr>

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

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

</th>

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

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

</th>

</tr>

</thead>

<tbody>

<tr>

<td style="text-align: left; border-right: 2px solid ; ">glGenerateMipmap</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="glTexImage2D"><span class="citerefentry"><span class="refentrytitle">glTexImage2D</span></span></a>,

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

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