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| <title>read_imagef (3D)</title> |
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| <body> |
| <div class="refentry"> |
| <a id="idm1"></a> |
| <div class="titlepage"></div> |
| <div xmlns="" class="refnamediv"> |
| <a xmlns="http://www.w3.org/1999/xhtml" id="read_image2d"></a> |
| <h1>read_imagef (3D)</h1> |
| <p> |
| Do an element lookup in the 3D image object, returning floating-point 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"> |
| float4 |
| <strong class="fsfunc"> |
| read_imagef |
| </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> |
| </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"> |
| float4 |
| <strong class="fsfunc"> |
| read_imagef |
| </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>. <span class="emphasis"><em>coord.w</em></span> is ignored. |
| </p> |
| <p> |
| <code class="function">read_imagef</code> returns floating-point values in the range [0.0... 1.0] for image objects created with <code class="varname">image_channel_data_type</code> set to one of the predefined packed formats or CL_UNORM_INT8 or CL_UNORM_INT16. |
| </p> |
| <p> |
| <code class="function">read_imagef</code> returns floating-point values in the range [-1.0... 1.0] for image objects created with <code class="varname">image_channel_data_type</code> set to CL_SNORM_INT8, or CL_SNORM_INT16. |
| </p> |
| <p> |
| <code class="function">read_imagef</code> returns floating-point values for image objects created with <code class="varname">image_channel_data_type</code> set to CL_HALF_FLOAT or CL_FLOAT. |
| </p> |
| <p> |
| The <code class="function">read_imagef</code> calls that take integer coordinates must use a sampler with filter mode set to CLK_FILTER_NEAREST, 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> |
| <p> |
| Values returned by <code class="function">read_imagef</code> for image objects with <code class="varname">image_channel_data_type</code> values not specified in the description above 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 class="informaltable" 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-1.0.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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