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| </style> |
| <title>write_image</title> |
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| <meta name="keywords" content="write_image" /> |
| </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="write_image"></a> |
| <h1>write_image</h1> |
| <p> |
| Write <code xmlns="http://www.w3.org/1999/xhtml" class="varname">color</code> value to location in a 2D image object. |
| </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="scalarDataTypes.html" target="_top">void</a> |
| <strong class="fsfunc"> |
| write_imagef |
| </strong> |
| (</code> |
| <td><a xmlns="http://www.w3.org/1999/xhtml" class="link" href="otherDataTypes.html" target="_top">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="_top">int2</a> <var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">coord</var>, </td> |
| </tr> |
| <tr valign="top"> |
| <td> </td> |
| <td><a xmlns="http://www.w3.org/1999/xhtml" class="link" href="vectorDataTypes.html" target="_top">float4</a> <var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">color</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="scalarDataTypes.html" target="_top">void</a> |
| <strong class="fsfunc"> |
| write_imagei |
| </strong> |
| (</code> |
| <td><a xmlns="http://www.w3.org/1999/xhtml" class="link" href="otherDataTypes.html" target="_top">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="_top">int2</a> <var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">coord</var>, </td> |
| </tr> |
| <tr valign="top"> |
| <td> </td> |
| <td><a xmlns="http://www.w3.org/1999/xhtml" class="link" href="vectorDataTypes.html" target="_top">int4</a> <var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">color</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="scalarDataTypes.html" target="_top">void</a> |
| <strong class="fsfunc"> |
| write_imageui |
| </strong> |
| (</code> |
| <td><a xmlns="http://www.w3.org/1999/xhtml" class="link" href="otherDataTypes.html" target="_top">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="_top">int2</a> <var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">coord</var>, </td> |
| </tr> |
| <tr valign="top"> |
| <td> </td> |
| <td><a xmlns="http://www.w3.org/1999/xhtml" class="link" href="vectorDataTypes.html" target="_top">uint4</a> <var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">color</var><code>)</code></td> |
| </tr> |
| </table> |
| </div> |
| </div> |
| <div class="refsect1"> |
| <a id="description"></a> |
| <h2>Description</h2> |
| <p> |
| Write <code class="varname">color</code> value to location specified by coordinate <span class="emphasis"><em>(x, y)</em></span> in the 2D image object specified by <code class="varname">image</code>. Appropriate data format conversion to the specified image format is done before writing the color value. <span class="emphasis"><em>x</em></span> and <span class="emphasis"><em>y</em></span> are considered to be unnormalized coordinates and must be in the range 0... image width - 1, and 0... image height - 1. |
| </p> |
| <p> |
| <code class="function">write_imagef</code> can only be used with image objects created with <code class="varname">image_channel_data_type</code> set to one of the pre-defined packed formats or set to CL_SNORM_INT8, CL_UNORM_INT8, CL_SNORM_INT16, CL_UNORM_INT16, CL_HALF_FLOAT, or CL_FLOAT. Appropriate data format conversion will be done to convert channel data from a floating-point value to actual data format in which the channels are stored. |
| </p> |
| <p> |
| <code class="function">write_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. |
| </p> |
| <p> |
| <code class="function">write_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, or CL_UNSIGNED_INT32. |
| </p> |
| <p> |
| The behavior of <code class="function">write_imagef</code>, <code class="function">write_imagei</code> and <code class="function">write_imageui</code> for image objects created with <code class="varname">image_channel_data_type</code> values not specified in the description above or with <span class="emphasis"><em>(x, y)</em></span> coordinate values that are not in the range (0... image width - 1, 0... image height - 1), respectively, is 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 |
| created with <a class="citerefentry" href="clCreateImage2D.html"><span class="citerefentry"><span class="refentrytitle">clCreateImage2D</span></span></a>, or <a class="citerefentry" href="clCreateImage3D.html"><span class="citerefentry"><span class="refentrytitle">clCreateImage3D</span></span></a>. 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. <a class="citerefentry" href="write_image.html"><span class="citerefentry"><span class="refentrytitle">write_image</span></span></a> 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. |
| <a class="citerefentry" href="read_image.html"><span class="citerefentry"><span class="refentrytitle">read_image</span></span></a> 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. <a class="citerefentry" href="read_image.html"><span class="citerefentry"><span class="refentrytitle">read_image</span></span></a> |
| and <a class="citerefentry" href="write_image.html"><span class="citerefentry"><span class="refentrytitle">write_image</span></span></a> calls to the same image memory |
| object in a kernel are not supported. |
| </p> |
| <p> |
| The <a class="citerefentry" href="read_image.html"><span class="citerefentry"><span class="refentrytitle">read_image</span></span></a> calls returns a four component floating-point, integer or unsigned integer color |
| value. The color values returned by <a class="citerefentry" href="read_image.html"><span class="citerefentry"><span class="refentrytitle">read_image</span></span></a> are identified as <em class="replaceable"><code>x, y, z, w</code></em> where <em class="replaceable"><code>x</code></em> refers to |
| the red component, <em class="replaceable"><code>y</code></em> refers to the green component, <em class="replaceable"><code>z</code></em> refers to the blue component and <em class="replaceable"><code>w</code></em> refers to the alpha component. |
| </p> |
| <p> |
| The image read functions take a sampler argument. The sampler can be passed as an argument |
| to the kernel using <a class="citerefentry" href="clSetKernelArg.html"><span class="citerefentry"><span class="refentrytitle">clSetKernelArg</span></span></a>, or it can be a constant variable of type <a class="citerefentry" href="sampler_t.html"><span class="citerefentry"><span class="refentrytitle">sampler_t</span></span></a> declared in the program source. |
| </p> |
| <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 uint4 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>, <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 CL_ADDRESS_CLAMP 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 CL_DEVICE_MAX_SAMPLERS. Enqueuing a kernel that |
| requires more samplers than the implementation can support will result in a |
| CL_OUT_OF_RESOURCES 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-1.1.pdf#page=234" 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 © 2007-2010 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> |
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| </html> |
