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

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

<div class="refnamediv">

<h2>Name</h2>

<p>mix — linearly interpolate between two values</p>

</div>

<div class="refsynopsisdiv">

<h2>Declaration</h2>

<div class="funcsynopsis">

<table style="border: 0; cellspacing: 0; cellpadding: 0;" class="funcprototype-table">

<tr>

<td>

<code class="funcdef">genType <strong class="fsfunc">mix</strong>(</code>

</td>

<td>genType <var class="pdparam">x</var>, </td>

</tr>

<tr>

<td> </td>

<td>genType <var class="pdparam">y</var>, </td>

</tr>

<tr>

<td> </td>

<td>genType <var class="pdparam">a</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">genType <strong class="fsfunc">mix</strong>(</code>

</td>

<td>genType <var class="pdparam">x</var>, </td>

</tr>

<tr>

<td> </td>

<td>genType <var class="pdparam">y</var>, </td>

</tr>

<tr>

<td> </td>

<td>float <var class="pdparam">a</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">genType <strong class="fsfunc">mix</strong>(</code>

</td>

<td>genType <var class="pdparam">x</var>, </td>

</tr>

<tr>

<td> </td>

<td>genType <var class="pdparam">y</var>, </td>

</tr>

<tr>

<td> </td>

<td>genBType <var class="pdparam">a</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>x</code>

</em>

</span>

</dt>

<dd>

<p>

Specify the start of the range in which to interpolate.

</p>

</dd>

<dt>

<span class="term">

<em class="parameter">

<code>y</code>

</em>

</span>

</dt>

<dd>

<p>

Specify the end of the range in which to interpolate.

</p>

</dd>

<dt>

<span class="term">

<em class="parameter">

<code>a</code>

</em>

</span>

</dt>

<dd>

<p>

Specify the value to use to interpolate between <em class="parameter"><code>x</code></em> and <em class="parameter"><code>y</code></em>.

</p>

</dd>

</dl>

</div>

</div>

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

<h2>Description</h2>

<p>

<code class="function">mix</code> performs a linear interpolation between <em class="parameter"><code>x</code></em>

and <em class="parameter"><code>y</code></em> using <em class="parameter"><code>a</code></em> to weight between them. The return value

is computed as follows:

<math overflow="scroll">

<mi>x</mi>

<mo lspace="2px" rspace="2px">⋅</mo>

<mo stretchy="false">(</mo>

<mn>1</mn>

<mo>−</mo>

<mi>a</mi>

<mo stretchy="false">)</mo>

<mo>+</mo>

<mi>y</mi>

<mo lspace="2px" rspace="2px">⋅</mo>

<mi>a</mi>

</math>.

</p>

<p>

For the variants of <code class="function">mix</code> where <em class="parameter"><code>a</code></em> is <code class="constant">genBType</code>,

elements for which <em class="parameter"><code>a</code></em>[<span class="emphasis"><em>i</em></span>] is <code class="constant">false</code>, the result for that

element is taken from <em class="parameter"><code>x</code></em>, and where <em class="parameter"><code>a</code></em>[<span class="emphasis"><em>i</em></span>] is

<code class="constant">true</code>, it will be taken from <em class="parameter"><code>y</code></em>. Components of <em class="parameter"><code>x</code></em>

and <em class="parameter"><code>y</code></em> that are not selected are allowed to be invalid floating point values and will have no effect

on the results.

</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; " 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 Shading Language 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>1.00</strong></span>

</th>

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

<span class="bold"><strong>3.00</strong></span>

</th>

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

<span class="bold"><strong>3.10</strong></span>

</th>

</tr>

</thead>

<tbody>

<tr>

<td style="text-align: left; border-right: 2px solid ; border-bottom: 2px solid ; ">mix (genType)</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 ; ">mix (genBType)</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="min"><span class="citerefentry"><span class="refentrytitle">min</span></span></a>,

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

</p>

</div>

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

<h2>Copyright</h2>

<p>

Copyright © 2011-2014 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>

</div>

</div>