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<title>read_imagei (3D)</title>
<meta name="generator" content="DocBook XSL Stylesheets V1.78.1" />
<meta name="keywords" content=" &#10; read_imagei (3D)&#10; " />
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<div class="refentry">
<a id="idp38009264"></a>
<div class="titlepage"></div>
<div xmlns="" class="refnamediv">
<a xmlns="http://www.w3.org/1999/xhtml" id="read_image2d"></a>
<h1>read_imagei (3D)</h1>
<p>
Do an element lookup in the 3D image object, returning unnormalized signed integer and unsigned integer values
</p>
</div>
<div class="refsynopsisdiv">
<h2></h2>
<div class="funcsynopsis">
<table xmlns="" border="0" summary="Function synopsis" cellspacing="0" cellpadding="0">
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<td>
<code xmlns="http://www.w3.org/1999/xhtml" class="funcdef">
<a class="link" href="scalarDataTypes.html" target="_top">int</a>
4
<strong class="fsfunc">
read_imagei
</strong>
(</code>
<td><a xmlns="http://www.w3.org/1999/xhtml" class="link" href="otherDataTypes.html" target="_top">image3d_t</a> <var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">image</var>, </td>
</td>
</tr>
<tr valign="top">
<td> </td>
<td><a xmlns="http://www.w3.org/1999/xhtml" class="link" href="otherDataTypes.html" target="_top">sampler_t</a> <var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">sampler</var>, </td>
</tr>
<tr valign="top">
<td> </td>
<td>int4 <var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">coord</var><code>)</code></td>
</tr>
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</div>
<div class="funcsynopsis">
<table xmlns="" border="0" summary="Function synopsis" cellspacing="0" cellpadding="0">
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<td>
<code xmlns="http://www.w3.org/1999/xhtml" class="funcdef">
<a class="link" href="scalarDataTypes.html" target="_top">int</a>
4
<strong class="fsfunc">
read_imagei
</strong>
(</code>
<td><a xmlns="http://www.w3.org/1999/xhtml" class="link" href="otherDataTypes.html" target="_top">image3d_t</a> <var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">image</var>, </td>
</td>
</tr>
<tr valign="top">
<td> </td>
<td><a xmlns="http://www.w3.org/1999/xhtml" class="link" href="otherDataTypes.html" target="_top">sampler_t</a> <var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">sampler</var>, </td>
</tr>
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<td> </td>
<td>float4 <var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">coord</var><code>)</code></td>
</tr>
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<div class="funcsynopsis">
<table xmlns="" border="0" summary="Function synopsis" cellspacing="0" cellpadding="0">
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<td>
<code xmlns="http://www.w3.org/1999/xhtml" class="funcdef">
unsigned int4
<strong class="fsfunc">
read_imageui
</strong>
(</code>
<td><a xmlns="http://www.w3.org/1999/xhtml" class="link" href="otherDataTypes.html" target="_top">image3d_t</a> <var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">image</var>, </td>
</td>
</tr>
<tr valign="top">
<td> </td>
<td><a xmlns="http://www.w3.org/1999/xhtml" class="link" href="otherDataTypes.html" target="_top">sampler_t</a> <var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">sampler</var>, </td>
</tr>
<tr valign="top">
<td> </td>
<td>int4 <var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">coord</var><code>)</code></td>
</tr>
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</div>
<div class="funcsynopsis">
<table xmlns="" border="0" summary="Function synopsis" cellspacing="0" cellpadding="0">
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<td>
<code xmlns="http://www.w3.org/1999/xhtml" class="funcdef">
unsigned int4
<strong class="fsfunc">
read_imageui
</strong>
(</code>
<td><a xmlns="http://www.w3.org/1999/xhtml" class="link" href="otherDataTypes.html" target="_top">image3d_t</a> <var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">image</var>, </td>
</td>
</tr>
<tr valign="top">
<td> </td>
<td><a xmlns="http://www.w3.org/1999/xhtml" class="link" href="otherDataTypes.html" target="_top">sampler_t</a> <var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">sampler</var>, </td>
</tr>
<tr valign="top">
<td> </td>
<td>float4 <var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">coord</var><code>)</code></td>
</tr>
</table>
</div>
</div>
<div class="refsect1">
<a id="description"></a>
<h2>Description</h2>
<p>
Use the coordinate <span class="emphasis"><em>(coord.x, coord.y, coord.z))</em></span> to do an element lookup in the 3D image object specified by <code class="varname">image</code>. <code class="varname">coord.w</code> is ignored.
</p>
<p>
<code class="function">read_imagei</code> and <code class="function">read_imageu{i|ui}</code> return unnormalized signed integer and unsigned integer values respectively. Each channel will be stored in a 32-bit integer.
</p>
<p>
<code class="function">read_imagei</code> can only be used with image objects created with <code class="varname">image_channel_data_type</code> set to one of the following values: CL_SIGNED_INT8, CL_SIGNED_INT16, or
CL_SIGNED_INT32. If the <code class="varname">image_channel_data_type</code> is not one of the above values, the values returned by <code class="function">read_imagei</code> are undefined.
</p>
<p>
<code class="function">read_imageui</code> can only be used with image objects created with <code class="varname">image_channel_data_type</code> set to one of the following values: CL_UNSIGNED_INT8, CL_UNSIGNED_INT16, and CL_UNSIGNED_INT32. If the <code class="varname">image_channel_data_type</code> is not one of the above values, the values returned by <code class="function">read_imageui</code> are undefined.
</p>
<p>
The <code class="function">read_imagei</code> and <code class="function">read_imageui</code> calls support a nearest filter only. The <code class="varname">filter_mode</code> specified in <code class="varname">sampler</code> must be set to CLK_FILTER_NEAREST; otherwise the values returned are undefined.
</p>
<p>
Furthermore, the <code class="function">read_imagei</code> and <code class="function">read_image{i|ui}</code> calls that take integer coordinates must use a sampler with normalized coordinates set to CLK_NORMALIZED_COORDS_FALSE and addressing mode set to CLK_ADDRESS_CLAMP_TO_EDGE, CLK_ADDRESS_CLAMP or CLK_ADDRESS_NONE; otherwise the values returned are undefined.
</p>
</div>
<div class="refsect1">
<a id="notes"></a>
<h2>Notes</h2>
<p>
The following table describes the mapping of the number of channels of an image element to the appropriate components in the float4, int4 or unsigned int4 vector data type for the color values returned by <code class="function">read_image{f|i|ui}</code> or supplied to <code class="function">write_image{f|i|ui}</code>. The unmapped components will be set to <code class="constant">0.0</code> for red, green and blue channels and will be set to <code class="constant">1.0</code> for the alpha channel.
</p>
<p>
</p>
<div class="informaltable">
<table border="1">
<colgroup>
<col align="center" class="col1" />
<col align="center" class="col2" />
</colgroup>
<thead>
<tr>
<th align="center">Channel Order</th>
<th align="center">float4, int4 or unsigned int4 components of channel data</th>
</tr>
</thead>
<tbody>
<tr>
<td align="center">
<code class="constant">CL_R</code>
</td>
<td align="center">
<code class="constant">(r, 0.0, 0.0, 1.0)</code>
</td>
</tr>
<tr>
<td align="center">
<code class="constant">CL_A</code>
</td>
<td align="center">
<code class="constant">(0.0, 0.0, 0.0, a)</code>
</td>
</tr>
<tr>
<td align="center">
<code class="constant">CL_RG</code>
</td>
<td align="center">
<code class="constant">(r, g, 0.0, 1.0)</code>
</td>
</tr>
<tr>
<td align="center">
<code class="constant">CL_RA</code>
</td>
<td align="center">
<code class="constant">(r, 0.0, 0.0, a)</code>
</td>
</tr>
<tr>
<td align="center">
<code class="constant">CL_RGB</code>
</td>
<td align="center">
<code class="constant">(r, g, b, 1.0)</code>
</td>
</tr>
<tr>
<td align="center">
<code class="constant">CL_RGBA, CL_BGRA, CL_ARGB</code>
</td>
<td align="center">
<code class="constant">(r, g, b, a)</code>
</td>
</tr>
<tr>
<td align="center">
<code class="constant">CL_INTENSITY</code>
</td>
<td align="center">
<code class="constant">(I, I, I, I)</code>
</td>
</tr>
<tr>
<td align="center">
<code class="constant">CL_LUMINANCE</code>
</td>
<td align="center">
<code class="constant">(L, L, L, 1.0)</code>
</td>
</tr>
</tbody>
</table>
</div>
<p>
</p>
</div>
<div class="refsect1">
<a id="specification"></a>
<h2>Specification</h2>
<p>
<img src="pdficon_small1.gif" />
<a href="http://www.khronos.org/registry/cl/specs/opencl-1.x-latest.pdf#page=190" target="OpenCL Spec">OpenCL Specification</a>
</p>
</div>
<div class="refsect1">
<a id="seealso"></a>
<h2>Also see</h2>
<p>
<a class="citerefentry" href="imageFunctions.html"><span class="citerefentry"><span class="refentrytitle">Image Functions</span></span></a>
</p>
</div>
<div xmlns="" class="refsect3" lang="en" xml:lang="en"><a xmlns="http://www.w3.org/1999/xhtml" id="Copyright"></a><h4 xmlns="http://www.w3.org/1999/xhtml"></h4><img xmlns="http://www.w3.org/1999/xhtml" src="KhronosLogo.jpg" /><p xmlns="http://www.w3.org/1999/xhtml"></p>Copyright © 2007-2009 The Khronos Group Inc.
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"Materials"), to deal in the Materials without restriction, including
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