| <?xml version="1.0" encoding="UTF-8"?> |
| <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "xhtml1-transitional.dtd"> |
| <!-- saved from url=(0013)about:internet --> |
| <?xml-stylesheet type="text/xsl" href="mathml.xsl"?><html xmlns="http://www.w3.org/1999/xhtml" xmlns:pref="http://www.w3.org/2002/Math/preference" xmlns:xlink="http://www.w3.org/1999/xlink" pref:renderer="mathplayer-dl"> |
| <head> |
| <meta http-equiv="Content-Type" content="text/html; charset=UTF-8" /> |
| <style xmlns="" type="text/css"> |
| /* This style sets a margin around the entire page */ |
| html, body { |
| margin: 10px; |
| } |
| |
| p { |
| font: normal 16px verdana, sans-serif; |
| margin: 0; |
| padding-bottom:12px; |
| } |
| |
| h1 { |
| font: bold 25px verdana, sans-serif; |
| margin-top: 0; |
| margin-bottom: 3px; |
| padding-top: 0; |
| padding-bottom: 0; |
| } |
| |
| h2 { |
| font: bold 19px verdana, sans-serif; |
| margin-top: 28px; |
| margin-bottom: 3px; |
| padding-top: 0; |
| padding-bottom: 0; |
| } |
| |
| h3 { |
| font: bold 19px verdana, sans-serif !important; |
| margin-top: 28px; |
| margin-bottom: 3px; |
| padding-top: 0; |
| padding-bottom: 0; |
| } |
| |
| li { |
| font: normal 16px verdana, sans-serif; |
| margin-top: 0; |
| margin-bottom: 18px; |
| padding-top: 0; |
| padding-bottom: 0; |
| } |
| |
| .pdparam { |
| font: italic 16px verdana, sans-serif; |
| } |
| |
| .term { |
| font: italic 16px verdana, sans-serif; |
| font-weight: normal; |
| } |
| |
| .type { |
| font: normal 16px verdana, sans-serif !important; |
| } |
| |
| .parameter { |
| font-style: italic; |
| } |
| |
| a:link, a:visited { |
| color: blue; |
| text-decoration: none; |
| font: normal 16px; |
| } |
| |
| a:hover { |
| background-color: #FFFF99; |
| font: normal 16px; |
| } |
| |
| div.funcsynopsis { |
| text-align: left; |
| background-color: #e6e6e6; |
| font: normal 16px verdana, sans-serif; |
| padding-top: 10px; |
| padding-bottom: 10px; |
| } |
| |
| div.funcsynopsis table { |
| border-collapse: separate; |
| font: normal 16px verdana, sans-serif; |
| } |
| |
| div.funcsynopsis td { |
| background-color: #e6e6e6; |
| border: 0 solid #000; |
| padding: 1px; |
| font: normal 16px verdana, sans-serif; |
| } |
| |
| div.refsect1 { |
| font-family: verdana, sans-serif; |
| font-size: 16px; |
| } |
| |
| code.constant { |
| font: normal 16px courier new, monospace !important; |
| } |
| |
| span.errorname { |
| font: normal 16px verdana, sans-serif !important; |
| } |
| |
| code.function { |
| font: bold 16px verdana, sans-serif !important; |
| } |
| |
| b.fsfunc { |
| font: bold 16px verdana, sans-serif !important; |
| } |
| |
| code.varname { |
| font: italic 16px verdana, sans-serif; |
| } |
| |
| code.replaceable { |
| font: italic 16px courier new, monospace; |
| } |
| |
| code.funcdef { |
| font: normal 16px verdana, sans-serif !important; |
| } |
| |
| .citerefentry { |
| font: normal 16px verdana, sans-serif !important; |
| } |
| |
| .parameter { |
| font-style: italic; |
| } |
| |
| code.fsfunc { |
| font: normal 16px verdana, sans-serif !important; |
| } |
| |
| /* PARAMETER: This style controls spacing between the terms in Parameter section */ |
| dt { |
| margin-top: 15px; |
| } |
| |
| /* TABLES: These styles apply to all tables OTHER than the Synopsis and Example tables */ |
| div.refsect1 table { |
| width: 100%; |
| margin-top: 10px; |
| background-color: #FFF; |
| border-collapse: collapse; |
| border-color: #000; |
| border-width: 1px; |
| font: normal 16px verdana, sans-serif; |
| } |
| |
| div.refsect1 th { |
| border-collapse: collapse; |
| border-color: #000; |
| border-width: 1px; |
| font: bold 16px verdana, sans-serif; |
| } |
| |
| div.refsect1 td { |
| background-color: #FFF; |
| padding: 5px; |
| vertical-align: text-top; |
| border-collapse: collapse; |
| border-color: #000; |
| border-width: 1px; |
| font: normal 16px verdana, sans-serif; |
| } |
| |
| div.refsect1 p{ |
| font: normal 16px verdana, sans-serif; |
| margin-top: 8px; |
| margin-bottom: 8px; |
| padding-top: 0; |
| padding-bottom: 0; |
| } |
| |
| |
| /* EXAMPLE: These styles apply only to the Example section */ |
| div.refsect2 { |
| font: normal 16px courier new, monospace !important; |
| } |
| |
| div.refsect2 table { |
| margin-top: 0; |
| background-color: #e6e6e6; |
| width: 100%; |
| border: 0 solid #000; |
| padding: 2px; |
| font: normal 16px courier new, monospace !important; |
| } |
| |
| div.refsect2 td { |
| background-color: #e6e6e6; |
| font: normal 16px courier new, monospace !important; |
| white-space:pre; |
| } |
| |
| /* COPYRIGHT: This style formats the text of the copyright statement at the bottom of the page */ |
| div.refsect3 { |
| font: normal 11px verdana, sans-serif; |
| margin-top: 50px; |
| margin-bottom: 20px; |
| padding-top: 0; |
| padding-bottom: 0; |
| } |
| |
| </style> |
| <title>read_imagei (2D)</title> |
| <meta name="generator" content="DocBook XSL Stylesheets V1.78.1" /> |
| <meta name="keywords" content="read_imagei (2D)" /> |
| </head> |
| <body> |
| <div class="refentry"> |
| <a id="id-1"></a> |
| <div class="titlepage"></div> |
| <div xmlns="" class="refnamediv"> |
| <a xmlns="http://www.w3.org/1999/xhtml" id="read_image2d"></a> |
| <h1>read_image{i|ui} (2D)</h1> |
| <p> |
| Do an element lookup in the 2D 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"> |
| <tr valign="bottom"> |
| <td> |
| <code xmlns="http://www.w3.org/1999/xhtml" class="funcdef"> |
| <a class="link" href="vectorDataTypes.html" target="pagedisplay">int4</a> |
| <strong class="fsfunc"> |
| read_imagei |
| </strong> |
| (</code> |
| <td> |
| <a xmlns="http://www.w3.org/1999/xhtml" class="link" href="otherDataTypes.html" target="pagedisplay">image2d_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="sampler_t.html" target="pagedisplay">sampler_t</a> |
| <var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">sampler</var> |
| , </td> |
| </tr> |
| <tr valign="top"> |
| <td> </td> |
| <td> |
| <a xmlns="http://www.w3.org/1999/xhtml" class="link" href="vectorDataTypes.html" target="pagedisplay">int2</a> |
| <var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">coord</var> |
| <code>)</code></td> |
| </tr> |
| </table> |
| </div> |
| <div class="funcsynopsis"> |
| <table xmlns="" border="0" summary="Function synopsis" cellspacing="0" cellpadding="0"> |
| <tr valign="bottom"> |
| <td> |
| <code xmlns="http://www.w3.org/1999/xhtml" class="funcdef"> |
| <a class="link" href="vectorDataTypes.html" target="pagedisplay">int4</a> |
| <strong class="fsfunc"> |
| read_imagei |
| </strong> |
| (</code> |
| <td> |
| <a xmlns="http://www.w3.org/1999/xhtml" class="link" href="otherDataTypes.html" target="pagedisplay">image2d_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="sampler_t.html" target="pagedisplay">sampler_t</a> |
| <var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">sampler</var> |
| , </td> |
| </tr> |
| <tr valign="top"> |
| <td> </td> |
| <td> |
| <a xmlns="http://www.w3.org/1999/xhtml" class="link" href="vectorDataTypes.html" target="pagedisplay">float2</a> |
| <var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">coord</var> |
| <code>)</code></td> |
| </tr> |
| </table> |
| </div> |
| <div class="funcsynopsis"> |
| <table xmlns="" border="0" summary="Function synopsis" cellspacing="0" cellpadding="0"> |
| <tr valign="bottom"> |
| <td> |
| <code xmlns="http://www.w3.org/1999/xhtml" class="funcdef"> |
| <a class="link" href="vectorDataTypes.html" target="pagedisplay">uint4</a> |
| <strong class="fsfunc"> |
| read_imageui |
| </strong> |
| (</code> |
| <td> |
| <a xmlns="http://www.w3.org/1999/xhtml" class="link" href="otherDataTypes.html" target="pagedisplay">image2d_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="sampler_t.html" target="pagedisplay">sampler_t</a> |
| <var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">sampler</var> |
| , </td> |
| </tr> |
| <tr valign="top"> |
| <td> </td> |
| <td> |
| <a xmlns="http://www.w3.org/1999/xhtml" class="link" href="vectorDataTypes.html" target="pagedisplay">int2</a> |
| <var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">coord</var> |
| <code>)</code></td> |
| </tr> |
| </table> |
| </div> |
| <div class="funcsynopsis"> |
| <table xmlns="" border="0" summary="Function synopsis" cellspacing="0" cellpadding="0"> |
| <tr valign="bottom"> |
| <td> |
| <code xmlns="http://www.w3.org/1999/xhtml" class="funcdef"> |
| <a class="link" href="vectorDataTypes.html" target="pagedisplay">int4</a> |
| <strong class="fsfunc"> |
| read_imagei |
| </strong> |
| (</code> |
| <td> |
| <a xmlns="http://www.w3.org/1999/xhtml" class="link" href="otherDataTypes.html" target="pagedisplay">image2d_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="vectorDataTypes.html" target="pagedisplay">int2</a> |
| <var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">coord</var> |
| <code>)</code></td> |
| </tr> |
| </table> |
| </div> |
| <div class="funcsynopsis"> |
| <table xmlns="" border="0" summary="Function synopsis" cellspacing="0" cellpadding="0"> |
| <tr valign="bottom"> |
| <td> |
| <code xmlns="http://www.w3.org/1999/xhtml" class="funcdef"> |
| <a class="link" href="vectorDataTypes.html" target="pagedisplay">uint4</a> |
| <strong class="fsfunc"> |
| read_imageui |
| </strong> |
| (</code> |
| <td> |
| <a xmlns="http://www.w3.org/1999/xhtml" class="link" href="otherDataTypes.html" target="pagedisplay">image2d_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="vectorDataTypes.html" target="pagedisplay">int2</a> |
| <var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">coord</var> |
| <code>)</code></td> |
| </tr> |
| </table> |
| </div> |
| <div class="funcsynopsis"> |
| <table xmlns="" border="0" summary="Function synopsis" cellspacing="0" cellpadding="0"> |
| <tr valign="bottom"> |
| <td> |
| <code xmlns="http://www.w3.org/1999/xhtml" class="funcdef"> |
| <a class="link" href="vectorDataTypes.html" target="pagedisplay">int4</a> |
| <strong class="fsfunc"> |
| read_imagei |
| </strong> |
| (</code> |
| <td> |
| <a xmlns="http://www.w3.org/1999/xhtml" class="link" href="otherDataTypes.html" target="pagedisplay">image2d_array_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="vectorDataTypes.html" target="pagedisplay">int4</a> |
| <var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">coord</var> |
| <code>)</code></td> |
| </tr> |
| </table> |
| </div> |
| <div class="funcsynopsis"> |
| <table xmlns="" border="0" summary="Function synopsis" cellspacing="0" cellpadding="0"> |
| <tr valign="bottom"> |
| <td> |
| <code xmlns="http://www.w3.org/1999/xhtml" class="funcdef"> |
| <a class="link" href="vectorDataTypes.html" target="pagedisplay">uint4</a> |
| <strong class="fsfunc"> |
| read_imageui |
| </strong> |
| (</code> |
| <td> |
| <a xmlns="http://www.w3.org/1999/xhtml" class="link" href="otherDataTypes.html" target="pagedisplay">image2d_array_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="vectorDataTypes.html" target="pagedisplay">int4</a> |
| <var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">coord</var> |
| <code>)</code></td> |
| </tr> |
| </table> |
| </div> |
| <div class="funcsynopsis"> |
| <table xmlns="" border="0" summary="Function synopsis" cellspacing="0" cellpadding="0"> |
| <tr valign="bottom"> |
| <td> |
| <code xmlns="http://www.w3.org/1999/xhtml" class="funcdef"> |
| <a class="link" href="vectorDataTypes.html" target="pagedisplay">int4</a> |
| <strong class="fsfunc"> |
| read_imagei |
| </strong> |
| (</code> |
| <td> |
| <a xmlns="http://www.w3.org/1999/xhtml" class="link" href="otherDataTypes.html" target="pagedisplay">image2d_array_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="sampler_t.html" target="pagedisplay">sampler_t</a> |
| <var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">sampler</var> |
| , </td> |
| </tr> |
| <tr valign="top"> |
| <td> </td> |
| <td> |
| <a xmlns="http://www.w3.org/1999/xhtml" class="link" href="vectorDataTypes.html" target="pagedisplay">int4</a> |
| <var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">coord</var> |
| <code>)</code></td> |
| </tr> |
| </table> |
| </div> |
| <div class="funcsynopsis"> |
| <table xmlns="" border="0" summary="Function synopsis" cellspacing="0" cellpadding="0"> |
| <tr valign="bottom"> |
| <td> |
| <code xmlns="http://www.w3.org/1999/xhtml" class="funcdef"> |
| <a class="link" href="vectorDataTypes.html" target="pagedisplay">int4</a> |
| <strong class="fsfunc"> |
| read_imagei |
| </strong> |
| (</code> |
| <td> |
| <a xmlns="http://www.w3.org/1999/xhtml" class="link" href="otherDataTypes.html" target="pagedisplay">image2d_array_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="sampler_t.html" target="pagedisplay">sampler_t</a> |
| <var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">sampler</var> |
| , </td> |
| </tr> |
| <tr valign="top"> |
| <td> </td> |
| <td> |
| <a xmlns="http://www.w3.org/1999/xhtml" class="link" href="vectorDataTypes.html" target="pagedisplay">float4</a> |
| <var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">coord</var> |
| <code>)</code></td> |
| </tr> |
| </table> |
| </div> |
| <div class="funcsynopsis"> |
| <table xmlns="" border="0" summary="Function synopsis" cellspacing="0" cellpadding="0"> |
| <tr valign="bottom"> |
| <td> |
| <code xmlns="http://www.w3.org/1999/xhtml" class="funcdef"> |
| <a class="link" href="vectorDataTypes.html" target="pagedisplay">int4</a> |
| <strong class="fsfunc"> |
| read_imageui |
| </strong> |
| (</code> |
| <td> |
| <a xmlns="http://www.w3.org/1999/xhtml" class="link" href="otherDataTypes.html" target="pagedisplay">image2d_array_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="sampler_t.html" target="pagedisplay">sampler_t</a> |
| <var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">sampler</var> |
| , </td> |
| </tr> |
| <tr valign="top"> |
| <td> </td> |
| <td> |
| <a xmlns="http://www.w3.org/1999/xhtml" class="link" href="vectorDataTypes.html" target="pagedisplay">int4</a> |
| <var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">coord</var> |
| <code>)</code></td> |
| </tr> |
| </table> |
| </div> |
| <div class="funcsynopsis"> |
| <table xmlns="" border="0" summary="Function synopsis" cellspacing="0" cellpadding="0"> |
| <tr valign="bottom"> |
| <td> |
| <code xmlns="http://www.w3.org/1999/xhtml" class="funcdef"> |
| <a class="link" href="vectorDataTypes.html" target="pagedisplay">int4</a> |
| <strong class="fsfunc"> |
| read_imageui |
| </strong> |
| (</code> |
| <td> |
| <a xmlns="http://www.w3.org/1999/xhtml" class="link" href="otherDataTypes.html" target="pagedisplay">image2d_array_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="sampler_t.html" target="pagedisplay">sampler_t</a> |
| <var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">sampler</var> |
| , </td> |
| </tr> |
| <tr valign="top"> |
| <td> </td> |
| <td> |
| <a xmlns="http://www.w3.org/1999/xhtml" class="link" href="vectorDataTypes.html" target="pagedisplay">float4</a> |
| <var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">coord</var> |
| <code>)</code></td> |
| </tr> |
| </table> |
| </div> |
| <div class="funcsynopsis"> |
| <table xmlns="" border="0" summary="Function synopsis" cellspacing="0" cellpadding="0"> |
| <tr valign="bottom"> |
| <td> |
| <code xmlns="http://www.w3.org/1999/xhtml" class="funcdef"> |
| <a class="link" href="vectorDataTypes.html" target="pagedisplay">uint4</a> |
| <strong class="fsfunc"> |
| read_imageui |
| </strong> |
| (</code> |
| <td> |
| <a xmlns="http://www.w3.org/1999/xhtml" class="link" href="otherDataTypes.html" target="pagedisplay">image2d_array_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="sampler_t.html" target="pagedisplay">sampler_t</a> |
| <var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">sampler</var> |
| , </td> |
| </tr> |
| <tr valign="top"> |
| <td> </td> |
| <td> |
| <a xmlns="http://www.w3.org/1999/xhtml" class="link" href="vectorDataTypes.html" target="pagedisplay">int4</a> |
| <var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">coord</var> |
| <code>)</code></td> |
| </tr> |
| </table> |
| </div> |
| <div class="funcsynopsis"> |
| <table xmlns="" border="0" summary="Function synopsis" cellspacing="0" cellpadding="0"> |
| <tr valign="bottom"> |
| <td> |
| <code xmlns="http://www.w3.org/1999/xhtml" class="funcdef"> |
| <a class="link" href="vectorDataTypes.html" target="pagedisplay">uint4</a> |
| <strong class="fsfunc"> |
| read_imageui |
| </strong> |
| (</code> |
| <td> |
| <a xmlns="http://www.w3.org/1999/xhtml" class="link" href="otherDataTypes.html" target="pagedisplay">image2d_array_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="sampler_t.html" target="pagedisplay">sampler_t</a> |
| <var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">sampler</var> |
| , </td> |
| </tr> |
| <tr valign="top"> |
| <td> </td> |
| <td> |
| <a xmlns="http://www.w3.org/1999/xhtml" class="link" href="vectorDataTypes.html" target="pagedisplay">float4</a> |
| <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> |
| For the forms that take an <span class="type">image2d_t</span> object, use the coordinate |
| <span class="emphasis"><em>(coord.x, coord.y)</em></span> to do an element lookup in the 2D image object |
| specified by <code class="varname">image</code>. |
| </p> |
| <p> |
| For the forms that take an <span class="type">image2d_array_t</span> object, use |
| <span class="emphasis"><em>coord.xy</em></span> to do an element lookup in the 2D image identified by |
| <span class="emphasis"><em>coord.z</em></span> in the 2D image array specified by <code class="varname">image</code>. |
| </p> |
| <p> |
| The samplerless read image functions behave exactly as the corresponding read |
| image functions that take integer coordinates and a sampler with filter mode |
| set to <code class="constant">CLK_FILTER_NEAREST</code>, normalized coordinates set |
| to <code class="constant">CLK_NORMALIZED_COORDS_FALSE</code> and addressing mode to |
| <code class="constant">CLK_ADDRESS_NONE</code>. |
| </p> |
| <p> |
| <code class="function">read_imagei</code> and <code class="function">read_imageui</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: |
| <code class="constant">CL_SIGNED_INT8</code>, <code class="constant">CL_SIGNED_INT16</code>, or |
| <code class="constant">CL_SIGNED_INT32</code>. 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: |
| <code class="constant">CL_UNSIGNED_INT8</code>, <code class="constant">CL_UNSIGNED_INT16</code>, and |
| <code class="constant">CL_UNSIGNED_INT32</code>. 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 <code class="constant">CLK_FILTER_NEAREST</code>; |
| otherwise the values returned are undefined. |
| </p> |
| <p> |
| Furthermore, the <code class="function">read_imagei</code> and <code class="function">read_imageui</code> |
| calls that take integer coordinates must use a sampler with normalized coordinates |
| set to <code class="constant">CLK_NORMALIZED_COORDS_FALSE</code> and addressing mode set to |
| <code class="constant">CLK_ADDRESS_CLAMP_TO_EDGE</code>, <code class="constant">CLK_ADDRESS_CLAMP</code> |
| or <code class="constant">CLK_ADDRESS_NONE</code>; otherwise the values returned are undefined. |
| </p> |
| </div> |
| <div class="refsect1"> |
| <a id="notes"></a> |
| <h2>Notes</h2> |
| <p> |
| The built-in functions defined in this section |
| can only be used with image memory objects. An image memory object can be accessed by |
| specific function calls that read from and/or write to specific locations in the image. |
| </p> |
| <p> |
| Image memory objects that are being read by a kernel should be declared with the <a class="citerefentry" href="accessQualifiers.html"><span class="citerefentry"><span class="refentrytitle">__read_only</span></span></a> |
| qualifier. <code class="function">write_image</code> calls to image memory objects declared with the |
| <a class="citerefentry" href="accessQualifiers.html"><span class="citerefentry"><span class="refentrytitle">__read_only</span></span></a> |
| qualifier will generate a compilation error. Image memory objects that |
| are being written to by a kernel should be declared with the <a class="citerefentry" href="accessQualifiers.html"><span class="citerefentry"><span class="refentrytitle">__write_only</span></span></a> qualifier. |
| <code class="function">read_image</code> calls to image memory objects declared with the <a class="citerefentry" href="accessQualifiers.html"><span class="citerefentry"><span class="refentrytitle">__write_only</span></span></a> |
| qualifier will generate a compilation error. <code class="function">read_image</code> and |
| <code class="function">write_image</code> calls to the same image memory object in a kernel are |
| not supported. |
| </p> |
| <p> |
| The <code class="function">read_image</code> calls returns a four component floating-point, integer or |
| unsigned integer color value. The color values returned by <code class="function">read_image</code> |
| are identified as <code class="code">x, y, z, w</code> where <code class="code">x</code> refers to the red component, |
| <code class="code">y</code> refers to the green component, <code class="code">z</code> refers to the blue component |
| and <code class="code">w</code> refers to the alpha component. |
| </p> |
| <p> |
| The following table describes the mapping |
| of the number of channels of an image element to the appropriate components in the |
| <span class="type">float4</span>, <span class="type">int4</span> or <span class="type">uint4</span> 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"><span class="type">float4</span>, <span class="type">int4</span> or <span class="type">uint4</span> components of channel data</th> |
| </tr> |
| </thead> |
| <tbody> |
| <tr> |
| <td align="center"><code class="constant">CL_R</code>, <code class="constant">CL_Rx</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>, <code class="constant">CL_RGx</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>, <code class="constant">CL_RGBx</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> |
| <p> |
| A kernel that uses a sampler with the <code class="constant">CL_ADDRESS_CLAMP</code> addressing |
| mode with multiple images may result in additional samplers being used internally |
| by an implementation. If the same sampler is used with multiple images called via |
| <code class="function">read_image{f|i|ui}</code>, then it is possible that an implementation may |
| need to allocate an additional sampler to handle the different border color values that |
| may be needed depending on the image formats being used. These implementation allocated |
| samplers will count against the maximum sampler values supported by the device and given by |
| <code class="constant">CL_DEVICE_MAX_SAMPLERS</code>. Enqueuing a kernel that requires more samplers |
| than the implementation can support will result in a <code class="constant">CL_OUT_OF_RESOURCES</code> |
| error being returned. |
| </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-1.2.pdf#page=292" 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 © 2007-2011 The Khronos Group Inc. |
| Permission is hereby granted, free of charge, to any person obtaining a |
| copy of this software and/or associated documentation files (the |
| "Materials"), to deal in the Materials without restriction, including |
| without limitation the rights to use, copy, modify, merge, publish, |
| distribute, sublicense, and/or sell copies of the Materials, and to |
| permit persons to whom the Materials are furnished to do so, subject to |
| the condition that this copyright notice and permission notice shall be included |
| in all copies or substantial portions of the Materials. |
| </div> |
| </div> |
| </body> |
| </html> |