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| <title>cl_image_format</title> |
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| <a id="idm1"></a> |
| <div class="titlepage"></div> |
| <div xmlns="" class="refnamediv"> |
| <a xmlns="http://www.w3.org/1999/xhtml" id="cl_image_format"></a> |
| <h1>cl_image_format</h1> |
| <p>The image format descriptor structure is defined as: </p> |
| </div> |
| <div class="refsect2"> |
| <a id="synopsis"></a> |
| <h3> |
| </h3> |
| <div class="informaltable"> |
| <table class="informaltable" border="0"> |
| <colgroup> |
| <col align="left" class="col1" /> |
| </colgroup> |
| <tbody> |
| <tr> |
| <td align="left">typedef struct _cl_image_format { |
| cl_channel_order image_channel_order; |
| cl_channel_type image_channel_data_type; |
| } cl_image_format;</td> |
| </tr> |
| </tbody> |
| </table> |
| </div> |
| </div> |
| <div class="refsect1"> |
| <a id="parameters"></a> |
| <h2>Members</h2> |
| <div class="variablelist"> |
| <dl class="variablelist"> |
| <dt> |
| <span class="term">image_channel_order</span> |
| </dt> |
| <dd> |
| Specifies the number of channels and the channel layout i.e. the |
| memory layout in which channels are stored in the image. Valid values are described in the table below. |
| |
| <div class="informaltable"><table class="informaltable" border="1"><colgroup><col align="left" class="col1" /><col align="left" class="col2" /></colgroup><thead><tr><th align="left">Format</th><th align="left">Description</th></tr></thead><tbody><tr><td align="left">CL_R, or CL_A</td><td align="left"> </td></tr><tr><td align="left">CL_INTENSITY</td><td align="left">This format can only be used if channel data type = CL_UNORM_INT8, CL_UNORM_INT16, CL_SNORM_INT8, CL_SNORM_INT16, |
| CL_HALF_FLOAT, or CL_FLOAT.</td></tr><tr><td align="left">CL_LUMINANCE</td><td align="left">This format can only be used if channel data type = CL_UNORM_INT8, CL_UNORM_INT16, CL_SNORM_INT8, CL_SNORM_INT16, |
| CL_HALF_FLOAT, or CL_FLOAT.</td></tr><tr><td align="left">CL_RG, or CL_RA</td><td align="left"> </td></tr><tr><td align="left">CL_RGB</td><td align="left">This format can only be used if channel data type = CL_UNORM_SHORT_565, CL_UNORM_SHORT_555 or CL_UNORM_INT_101010.</td></tr><tr><td align="left">CL_RGBA</td><td align="left"> </td></tr><tr><td align="left">CL_ARGB, CL_BGRA.</td><td align="left">This format can only be used if channel data type = CL_UNORM_INT8, CL_SNORM_INT8, CL_SIGNED_INT8 or CL_UNSIGNED_INT8.</td></tr></tbody></table></div><p> |
| |
| </p></dd> |
| <dt> |
| <span class="term">image_channel_data_type</span> |
| </dt> |
| <dd> |
| Describes the size of the channel data type. The number of bits per element determined by the |
| <em class="structfield"><code>image_channel_data_type</code></em> and <em class="structfield"><code>image_channel_order</code></em> must be a power of two. The list of supported values is described in the table below. |
| |
| <div class="informaltable"><table class="informaltable" border="1"><colgroup><col align="left" class="col1" /><col align="left" class="col2" /></colgroup><thead><tr><th align="left">Image Channel Data Type</th><th align="left">Description</th></tr></thead><tbody><tr><td align="left">CL_SNORM_INT8</td><td align="left">Each channel component is a normalized signed 8-bit integer value.</td></tr><tr><td align="left">CL_SNORM_INT16</td><td align="left">Each channel component is a normalized signed 16-bit integer value.</td></tr><tr><td align="left">CL_UNORM_INT8</td><td align="left">Each channel component is a normalized unsigned 8-bit integer value.</td></tr><tr><td align="left">CL_UNORM_INT16</td><td align="left">Each channel component is a normalized unsigned 16-bit integer value.</td></tr><tr><td align="left">CL_UNORM_SHORT_565</td><td align="left">Represents a normalized 5-6-5 3-channel RGB image. The channel order must be CL_RGB.</td></tr><tr><td align="left">CL_UNORM_SHORT_555</td><td align="left">Represents a normalized x-5-5-5 4-channel xRGB image. The channel order must be CL_RGB.</td></tr><tr><td align="left">CL_UNORM_INT_101010</td><td align="left">Represents a normalized x-10-10-10 4-channel xRGB image. The channel order must be CL_RGB.</td></tr><tr><td align="left">CL_SIGNED_INT8</td><td align="left">Each channel component is an unnormalized signed 8-bit integer value.</td></tr><tr><td align="left">CL_SIGNED_INT16</td><td align="left">Each channel component is an unnormalized signed 16-bit integer value.</td></tr><tr><td align="left">CL_SIGNED_INT32</td><td align="left">Each channel component is an unnormalized signed 32-bit integer value.</td></tr><tr><td align="left">CL_UNSIGNED_INT8</td><td align="left">Each channel component is an unnormalized unsigned 8-bit integer value.</td></tr><tr><td align="left">CL_UNSIGNED_INT16</td><td align="left">Each channel component is an unnormalized unsigned 16-bit integer value.</td></tr><tr><td align="left">CL_UNSIGNED_INT32</td><td align="left">Each channel component is an unnormalized unsigned 32-bit integer value.</td></tr><tr><td align="left">CL_HALF_FLOAT</td><td align="left">Each channel component is a 16-bit half-float value.</td></tr><tr><td align="left">CL_FLOAT</td><td align="left">Each channel component is a single precision floating-point value.</td></tr></tbody></table></div><p> |
| |
| </p></dd> |
| </dl> |
| </div> |
| </div> |
| <div class="refsect1"> |
| <a id="description"></a> |
| <h2>Description</h2> |
| <p> |
| The following example shows how to specify a normalized unsigned 8-bit / channel RGBA image:</p> |
| <div class="literallayout"> |
| <p> image_channel_order = CL_RGBA<br /> |
| image_channel_data_type = CL_UNORM_INT8<br /> |
| </p> |
| </div> |
| <p> |
| <code class="constant">image_channel_data_type</code> values of CL_UNORM_SHORT_565, |
| CL_UNORM_SHORT_555 and CL_UNORM_INT_101010 are special cases of packed image |
| formats where the channels of each element are packed into a single unsigned short or unsigned |
| int. For these special packed image formats, the channels are normally packed with the first |
| channel in the most significant bits of the bitfield, and successive channels occupying |
| progressively less significant locations. For CL_UNORM_SHORT_565, R is in bits 15:11, G is |
| in bits 10:5 and B is in bits 4:0. For CL_UNORM_SHORT_555, bit 15 is undefined, R is in |
| bits 14:10, G in bits 9:5 and B in bits 4:0. For CL_UNORM_INT_101010, bits 31:30 are |
| undefined, R is in bits 29:20, G in bits 19:10 and B in bits 9:0. |
| </p> |
| <p> |
| OpenCL implementations must maintain the minimum precision specified by the number of bits in <code class="constant">image_channel_data_type</code>. If the image format specified by |
| <code class="constant">image_channel_order</code>, and <code class="constant">image_channel_data_type</code> cannot be supported by the |
| OpenCL implementation, then the call to <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> will return a NULL memory object. |
| </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=62" target="OpenCL Spec">OpenCL Specification</a> |
| </p> |
| </div> |
| <div class="refsect1"> |
| <a id="seealso"></a> |
| <h2>Also see</h2> |
| <p> |
| <a class="citerefentry" href="EXTENSION.html"><span class="citerefentry"><span class="refentrytitle">EXTENSION</span></span></a>, |
| <a class="citerefentry" href="clGetSupportedImageFormats.html"><span class="citerefentry"><span class="refentrytitle">clGetSupportedImageFormats</span></span></a>, |
| <a class="citerefentry" href="clCreateImage2D.html"><span class="citerefentry"><span class="refentrytitle">clCreateImage2D</span></span></a>, |
| <a class="citerefentry" href="clCreateImage3D.html"><span class="citerefentry"><span class="refentrytitle">clCreateImage3D</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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