<div class="refentry"><a id="glGenerateMipmap"></a><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 class="funcprototype-table" style="cellspacing: 0; cellpadding: 0;"><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"><a id="parameters"></a><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_1D</code>, <code class="constant">GL_TEXTURE_2D</code>, <code class="constant">GL_TEXTURE_3D</code>,

<code class="constant">GL_TEXTURE_1D_ARRAY</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"><a id="description"></a><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 one- and two-dimensional texture arrays, each layer is filtered

independently.

</p></div><div class="refsect1"><a id="errors"></a><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></div>

{$pipelinestall}{$examples}

<div class="refsect1"><a id="seealso"></a><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"><div id="Copyright"><h2>Copyright</h2><p>

Copyright © 2010 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="ulink" href="https://opencontent.org/openpub/" target="_top">https://opencontent.org/openpub/</a>.

</p></div></div></div>