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| <title>clCreateImage</title> |
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| </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="clCreateImage"></a> |
| <h1> |
| clCreateImage |
| </h1> |
| <p> |
| Creates a 1D image, 1D image buffer, 1D image array, 2D image, 2D image array or 3D 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="abstractDataTypes.html" target="pagedisplay">cl_mem</a> <strong class="fsfunc">clCreateImage</strong> |
| (</code> |
| <td><a xmlns="http://www.w3.org/1999/xhtml" class="link" href="abstractDataTypes.html" target="pagedisplay">cl_context</a> <var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">context</var>, </td> |
| </td> |
| </tr> |
| <tr valign="top"> |
| <td> </td> |
| <td><a xmlns="http://www.w3.org/1999/xhtml" class="link" href="enums.html#cl_mem_flags" target="pagedisplay">cl_mem_flags</a> <var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">flags</var>, </td> |
| </tr> |
| <tr valign="top"> |
| <td> </td> |
| <td>const <a xmlns="http://www.w3.org/1999/xhtml" class="link" href="cl_image_format.html" target="pagedisplay">cl_image_format</a> <var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">*image_format</var>, </td> |
| </tr> |
| <tr valign="top"> |
| <td> </td> |
| <td>const <a xmlns="http://www.w3.org/1999/xhtml" class="link" href="cl_image_desc.html" target="pagedisplay">cl_image_desc</a> <var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">*image_desc</var>, </td> |
| </tr> |
| <tr valign="top"> |
| <td> </td> |
| <td><a xmlns="http://www.w3.org/1999/xhtml" class="link" href="scalarDataTypes.html" target="pagedisplay">void</a> <var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">*host_ptr</var>, </td> |
| </tr> |
| <tr valign="top"> |
| <td> </td> |
| <td><a xmlns="http://www.w3.org/1999/xhtml" class="link" href="scalarDataTypes.html" target="pagedisplay">cl_int</a> <var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">*errcode_ret</var><code>)</code></td> |
| </tr> |
| </table> |
| </div> |
| </div> |
| <div class="refsect1"> |
| <a id="parameters"></a> |
| <h2>Parameters</h2> |
| <div class="variablelist"> |
| <dl class="variablelist"> |
| <dt> |
| <span class="term"> <code class="varname"> context </code> </span> |
| </dt> |
| <dd> |
| <p> |
| A valid OpenCL context on which the image object is to be created. |
| </p> |
| </dd> |
| <dt> |
| <span class="term"> <code class="varname"> flags </code> </span> |
| </dt> |
| <dd> |
| <p> |
| A bit-field that is used to specify allocation |
| and usage information about the image memory object being created and is |
| described in the table below. |
| </p> |
| <p> |
| For all image types except <code class="constant">CL_MEM_OBJECT_IMAGE1D_BUFFER</code>, |
| if value specified for <code class="varname">flags</code> is 0, the default is used |
| which is <code class="constant">CL_MEM_READ_WRITE</code>. |
| </p> |
| <p> |
| For <code class="constant">CL_MEM_OBJECT_IMAGE1D_BUFFER</code> image type, if the |
| <code class="constant">CL_MEM_READ_WRITE</code>, <code class="constant">CL_MEM_READ_ONLY</code> |
| or <code class="constant">CL_MEM_WRITE_ONLY</code> values are not specified in |
| <code class="varname">flags</code>, they are inherited from the corresponding |
| memory access qualifers associated with <code class="varname">buffer</code>. |
| The <code class="constant">CL_MEM_USE_HOST_PTR</code>, |
| <code class="constant">CL_MEM_ALLOC_HOST_PTR</code> and |
| <code class="constant">CL_MEM_COPY_HOST_PTR</code> values cannot |
| be specified in <code class="varname">flags</code> but are inherited |
| from the corresponding memory access qualifiers associated with |
| <code class="varname">buffer</code>. If <code class="constant">CL_MEM_COPY_HOST_PTR</code> |
| is specified in the memory access qualifier values associated with |
| <code class="varname">buffer</code> it does not imply any additional copies |
| when the sub-buffer is created from <code class="varname">buffer</code>. |
| If the <code class="constant">CL_MEM_HOST_WRITE_ONLY</code>, |
| <code class="constant">CL_MEM_HOST_READ_ONLY</code> or |
| <code class="constant">CL_MEM_HOST_NO_ACCESS</code> values are not specified in |
| <code class="varname">flags</code>, they are inherited from the corresponding memory |
| access qualifiers associated with <code class="varname">buffer</code>. |
| </p> |
| <div class="informaltable"> |
| <table border="1"> |
| <colgroup> |
| <col align="left" class="col1" /> |
| <col /> |
| </colgroup> |
| <thead> |
| <tr> |
| <th align="left">cl_mem_flags</th> |
| <th align="left">Description</th> |
| </tr> |
| </thead> |
| <tbody> |
| <tr> |
| <td align="left"> |
| <code class="constant">CL_MEM_READ_WRITE</code> |
| </td> |
| <td align="left"> |
| This flag specifies that the memory object will be read and written by a kernel. This |
| is the default. |
| </td> |
| </tr> |
| <tr> |
| <td align="left"> |
| <code class="constant">CL_MEM_WRITE_ONLY</code> |
| </td> |
| <td align="left"> |
| <p> |
| This flags specifies that the memory object will be written but not read by |
| a kernel. |
| </p> |
| |
| <p> |
| Reading from a buffer or image object created with |
| <code class="constant">CL_MEM_WRITE_ONLY</code> inside a kernel is undefined. |
| </p> |
| |
| <p> |
| <code class="constant">CL_MEM_READ_WRITE</code> and <code class="constant">CL_MEM_WRITE_ONLY</code> |
| are mutually exclusive. |
| </p> |
| </td> |
| </tr> |
| <tr> |
| <td align="left"> |
| <code class="constant">CL_MEM_READ_ONLY</code> |
| </td> |
| <td align="left"> |
| <p> |
| This flag specifies that the memory object is a read-only memory object when |
| used inside a kernel. |
| </p> |
| |
| <p> |
| Writing to a buffer or image object created with |
| <code class="constant">CL_MEM_READ_ONLY</code> inside a kernel is undefined. |
| </p> |
| |
| <p> |
| <code class="constant">CL_MEM_READ_WRITE</code> or <code class="constant">CL_MEM_WRITE_ONLY</code> |
| and <code class="constant">CL_MEM_READ_ONLY</code> are mutually exclusive. |
| </p> |
| </td> |
| </tr> |
| <tr> |
| <td align="left"> |
| <code class="constant">CL_MEM_USE_HOST_PTR</code> |
| </td> |
| <td align="left"> |
| <p> |
| This flag is valid only if <code class="varname">host_ptr</code> is not NULL. If |
| specified, it indicates that the application wants the OpenCL implementation |
| to use memory referenced by <code class="varname">host_ptr</code> as the storage bits |
| for the memory object. |
| </p> |
| |
| <p> |
| OpenCL implementations are allowed to cache the buffer contents pointed to by |
| <code class="varname">host_ptr</code> in device memory. This cached copy can be used when |
| kernels are executed on a device. |
| </p> |
| |
| <p> |
| The result of OpenCL commands that operate on multiple buffer objects created with |
| the same <code class="varname">host_ptr</code> or overlapping host regions is considered |
| to be undefined. |
| </p> |
| |
| <p> |
| Refer to the <a class="citerefentry" href="dataTypes.html"><span class="citerefentry"><span class="refentrytitle">description |
| of the alignment rules</span></span></a> for |
| <code class="varname">host_ptr</code> for memory objects (buffer and images) created |
| using <code class="constant">CL_MEM_USE_HOST_PTR</code>. |
| </p> |
| </td> |
| </tr> |
| <tr> |
| <td align="left"> |
| <code class="constant">CL_MEM_ALLOC_HOST_PTR</code> |
| </td> |
| <td align="left"> |
| <p> |
| This flag specifies that the application wants the OpenCL implementation to |
| allocate memory from host accessible memory. |
| </p> |
| |
| <p> |
| <code class="constant">CL_MEM_ALLOC_HOST_PTR</code> and |
| <code class="constant">CL_MEM_USE_HOST_PTR</code> are mutually exclusive. |
| </p> |
| </td> |
| </tr> |
| <tr> |
| <td align="left"> |
| <code class="constant">CL_MEM_COPY_HOST_PTR</code> |
| </td> |
| <td align="left"> |
| <p> |
| This flag is valid only if <code class="varname">host_ptr</code> is not NULL. If specified, |
| it indicates that the application wants the OpenCL implementation to allocate |
| memory for the memory object and copy the data from memory referenced by |
| <code class="varname">host_ptr</code>. |
| </p> |
| |
| <p> |
| <code class="constant">CL_MEM_COPY_HOST_PTR</code> and |
| <code class="constant">CL_MEM_USE_HOST_PTR</code> are mutually exclusive. |
| </p> |
| |
| <p> |
| <code class="constant">CL_MEM_COPY_HOST_PTR</code> can be used with |
| <code class="constant">CL_MEM_ALLOC_HOST_PTR</code> to initialize the contents of the |
| <span class="type">cl_mem</span> object allocated using host-accessible (e.g. PCIe) memory. |
| </p> |
| </td> |
| </tr> |
| <tr> |
| <td align="left"> |
| <code class="constant">CL_MEM_HOST_WRITE_ONLY</code> |
| </td> |
| <td align="left"> |
| <p> |
| This flag specifies that the host will only write to the memory object (using |
| OpenCL APIs that enqueue a write or a map for write). This can be used to optimize |
| write access from the host (e.g. enable write combined allocations for memory |
| objects for devices that communicate with the host over a system bus such as PCIe). |
| </p> |
| </td> |
| </tr> |
| <tr> |
| <td align="left"> |
| <code class="constant">CL_MEM_HOST_READ_ONLY</code> |
| </td> |
| <td align="left"> |
| <p> |
| This flag specifies that the host will only read the memory object (using OpenCL |
| APIs that enqueue a read or a map for read). |
| </p> |
| |
| <p> |
| <code class="constant">CL_MEM_HOST_WRITE_ONLY</code> and |
| <code class="constant">CL_MEM_HOST_READ_ONLY</code> are mutually exclusive. |
| </p> |
| </td> |
| </tr> |
| <tr> |
| <td align="left"> |
| <code class="constant">CL_MEM_HOST_NO_ACCESS</code> |
| </td> |
| <td align="left"> |
| <p> |
| This flag specifies that the host will not read or write the memory object. |
| </p> |
| |
| <p> |
| <code class="constant">CL_MEM_HOST_WRITE_ONLY</code> or |
| <code class="constant">CL_MEM_HOST_READ_ONLY</code> and |
| <code class="constant">CL_MEM_HOST_NO_ACCESS</code> are mutually exclusive. |
| </p> |
| </td> |
| </tr> |
| </tbody> |
| </table> |
| </div> |
| </dd> |
| <dt> |
| <span class="term"> <code class="varname"> image_format </code> </span> |
| </dt> |
| <dd> |
| <p> |
| A pointer to a structure that |
| describes format properties of the image to be allocated. See |
| <a class="citerefentry" href="cl_image_format.html"><span class="citerefentry"><span class="refentrytitle">cl_image_format</span></span></a> |
| for a detailed description of the image format descriptor. |
| </p> |
| </dd> |
| <dt> |
| <span class="term"> <code class="varname"> image_desc </code> </span> |
| </dt> |
| <dd> |
| <p> |
| A pointer to a structure that |
| describes type and dimensions of the image to be allocated. See |
| <a class="citerefentry" href="cl_image_desc.html"><span class="citerefentry"><span class="refentrytitle">cl_image_desc</span></span></a> |
| for more information. |
| </p> |
| </dd> |
| <dt> |
| <span class="term"> <code class="varname"> host_ptr </code> </span> |
| </dt> |
| <dd> |
| <p> |
| A pointer to the image data that may already be allocated by the application. |
| Refer to table below for a description of how large the buffer that |
| <code class="varname">host_ptr</code> points to must be. |
| </p> |
| <div class="informaltable"> |
| <table border="1"> |
| <colgroup> |
| <col align="left" class="col1" /> |
| <col align="left" class="col2" /> |
| </colgroup> |
| <thead> |
| <tr> |
| <th align="left">Image Type</th> |
| <th align="left">Size of buffer that <code class="varname">host_ptr</code> points to</th> |
| </tr> |
| </thead> |
| <tbody> |
| <tr> |
| <td align="left"> |
| <code class="constant">CL_MEM_OBJECT_IMAGE1D</code> |
| </td> |
| <td align="left"> |
| <code class="constant">≥ image_row_pitch</code> |
| </td> |
| </tr> |
| <tr> |
| <td align="left"> |
| <code class="constant">CL_MEM_OBJECT_IMAGE1D_BUFFER</code> |
| </td> |
| <td align="left"> |
| <code class="constant">≥ image_row_pitch</code> |
| </td> |
| </tr> |
| <tr> |
| <td align="left"> |
| <code class="constant">CL_MEM_OBJECT_IMAGE2D</code> |
| </td> |
| <td align="left"> |
| <code class="constant">≥ image_row_pitch * image_height</code> |
| </td> |
| </tr> |
| <tr> |
| <td align="left"> |
| <code class="constant">CL_MEM_OBJECT_IMAGE3D</code> |
| </td> |
| <td align="left"> |
| <code class="constant">≥ image_slice_pitch * image_depth</code> |
| </td> |
| </tr> |
| <tr> |
| <td align="left"> |
| <code class="constant">CL_MEM_OBJECT_IMAGE1D_ARRAY</code> |
| </td> |
| <td align="left"> |
| <code class="constant">≥ image_slice_pitch * image_array_size</code> |
| </td> |
| </tr> |
| <tr> |
| <td align="left"> |
| <code class="constant">CL_MEM_OBJECT_IMAGE2D_ARRAY</code> |
| </td> |
| <td align="left"> |
| <code class="constant">≥ image_slice_pitch * image_array_size</code> |
| </td> |
| </tr> |
| </tbody> |
| </table> |
| </div> |
| <p> |
| For a 3D image or 2D image array, the image data specified by |
| <code class="varname">host_ptr</code> is stored as a linear sequence of adjacent 2D |
| image slices or 2D images respectively. Each 2D image is a linear sequence |
| of adjacent scanlines. Each scanline is a linear sequence of image elements. |
| </p> |
| <p> |
| For a 2D image, the image data specified by <code class="varname">host_ptr</code> |
| is stored as a linear sequence of adjacent scanlines. Each scanline is |
| a linear sequence of image elements. |
| </p> |
| <p> |
| For a 1D image array, the image data specified by <code class="varname">host_ptr</code> |
| is stored as a linear sequence of adjacent 1D images respectively. Each 1D |
| image or 1D image buffer is a single scanline which is a linear sequence |
| of adjacent elements. |
| </p> |
| </dd> |
| <dt> |
| <span class="term"> <code class="varname"> errcode_ret </code> </span> |
| </dt> |
| <dd> |
| <p> |
| Will return an appropriate error code. If <code class="varname">errcode_ret</code> |
| is NULL, no error code is returned. |
| </p> |
| </dd> |
| </dl> |
| </div> |
| </div> |
| <div class="refsect1"> |
| <a id="errors"></a> |
| <h2>Errors</h2> |
| <p> |
| <code class="function">clCreateImage</code> returns a valid non-zero image object and |
| <code class="varname">errcode_ret</code> is set to <span class="errorname">CL_SUCCESS</span> if the |
| image object is created successfully. Otherwise, it returns a NULL value with one of |
| the following error values returned in <code class="varname">errcode_ret</code>: |
| </p> |
| <div class="itemizedlist"> |
| <ul class="itemizedlist" style="list-style-type: disc; "> |
| <li class="listitem" style="list-style-type: disc"><span class="errorname">CL_INVALID_CONTEXT</span> if <code class="varname">context</code> is not a valid context. |
| </li> |
| <li class="listitem" style="list-style-type: disc"><span class="errorname">CL_INVALID_VALUE</span> if values specified in <code class="varname">flags</code> are not valid. |
| </li> |
| <li class="listitem" style="list-style-type: disc"><span class="errorname">CL_INVALID_IMAGE_FORMAT_DESCRIPTOR</span> if values specified in |
| <code class="varname">image_format</code> are not valid or if <code class="varname">image_format</code> |
| is NULL. |
| </li> |
| <li class="listitem" style="list-style-type: disc"><span class="errorname">CL_INVALID_IMAGE_DESCRIPTOR</span> if values specified in |
| <code class="varname">image_desc</code> are not valid or if <code class="varname">image_desc</code> |
| is NULL. |
| </li> |
| <li class="listitem" style="list-style-type: disc"><span class="errorname">CL_INVALID_IMAGE_SIZE</span> if image dimensions specified |
| in <code class="varname">image_desc</code> exceed the minimum maximum image dimensions |
| described in the table of allowed values for <code class="varname">param_name</code> |
| for <a class="citerefentry" href="clGetDeviceInfo.html"><span class="citerefentry"><span class="refentrytitle">clGetDeviceInfo</span></span></a> |
| for all devices in <code class="varname">context</code>. |
| </li> |
| <li class="listitem" style="list-style-type: disc"><span class="errorname">CL_INVALID_HOST_PTR</span> if <code class="varname">host_ptr</code> in |
| <code class="varname">image_desc</code> is NULL and <code class="constant">CL_MEM_USE_HOST_PTR</code> or |
| <code class="constant">CL_MEM_COPY_HOST_PTR</code> are set in <code class="varname">flags</code> or if |
| <code class="varname">host_ptr</code> is not NULL but <code class="constant">CL_MEM_COPY_HOST_PTR</code> |
| or <code class="constant">CL_MEM_USE_HOST_PTR</code> are not set in <code class="varname">flags</code>. |
| </li> |
| <li class="listitem" style="list-style-type: disc"><span class="errorname">CL_INVALID_VALUE</span> if a 1D image buffer is being created |
| and the buffer object was created with <code class="constant">CL_MEM_WRITE_ONLY</code> |
| and <code class="varname">flags</code> specifies <code class="constant">CL_MEM_READ_WRITE</code> |
| or <code class="constant">CL_MEM_READ_ONLY</code>, or if the buffer object was |
| created with <code class="constant">CL_MEM_READ_ONLY</code> and <code class="varname">flags</code> specifies |
| <code class="constant">CL_MEM_READ_WRITE</code> or <code class="constant">CL_MEM_WRITE_ONLY</code>, or |
| if <code class="varname">flags</code> specifies <code class="constant">CL_MEM_USE_HOST_PTR</code> |
| or <code class="constant">CL_MEM_ALLOC_HOST_PTR</code> or |
| <code class="constant">CL_MEM_COPY_HOST_PTR</code>. |
| </li> |
| <li class="listitem" style="list-style-type: disc"><span class="errorname">CL_INVALID_VALUE</span> if a 1D image buffer is being created and |
| the buffer object was created with <code class="constant">CL_MEM_HOST_WRITE_ONLY</code> |
| and <code class="varname">flags</code> specifies <code class="constant">CL_MEM_HOST_READ_ONLY</code>, |
| or if the buffer object was created with <code class="constant">CL_MEM_HOST_READ_ONLY</code> |
| and <code class="varname">flags</code> specifies <code class="constant">CL_MEM_HOST_WRITE_ONLY</code>, |
| or if the buffer object was created with <code class="constant">CL_MEM_HOST_NO_ACCESS</code> |
| and <code class="varname">flags</code> specifies <code class="constant">CL_MEM_HOST_READ_ONLY</code> |
| or <code class="constant">CL_MEM_HOST_WRITE_ONLY</code>. |
| </li> |
| <li class="listitem" style="list-style-type: disc"><span class="errorname">CL_IMAGE_FORMAT_NOT_SUPPORTED</span> if the |
| <code class="varname">image_format</code> is not supported. |
| </li> |
| <li class="listitem" style="list-style-type: disc"><span class="errorname">CL_MEM_OBJECT_ALLOCATION_FAILURE</span> if there is a failure to |
| allocate memory for image object. |
| </li> |
| <li class="listitem" style="list-style-type: disc"><span class="errorname">CL_INVALID_OPERATION</span> if there are |
| no devices in <code class="varname">context</code> that support |
| images (i.e. <code class="constant">CL_DEVICE_IMAGE_SUPPORT</code> |
| (specified in the table of OpenCL Device Queries for |
| <a class="citerefentry" href="clGetDeviceInfo.html"><span class="citerefentry"><span class="refentrytitle">clGetDeviceInfo</span></span></a>) |
| is <code class="constant">CL_FALSE</code>). |
| </li> |
| <li class="listitem" style="list-style-type: disc"><span class="errorname">CL_OUT_OF_RESOURCES</span> if there is a failure to allocate |
| resources required by the OpenCL implementation on the device. |
| </li> |
| <li class="listitem" style="list-style-type: disc"><span class="errorname">CL_OUT_OF_HOST_MEMORY</span> if there is a failure to allocate |
| resources required by the OpenCL implementation on the host. |
| </li> |
| </ul> |
| </div> |
| </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=90" target="OpenCL Spec">OpenCL Specification</a> |
| </p> |
| </div> |
| <div class="refsect1"> |
| <a id="seealso"></a> |
| <h2>Also see</h2> |
| <p> |
| <a class="citerefentry" href="cl_image_desc.html"><span class="citerefentry"><span class="refentrytitle">cl_image_desc</span></span></a>, |
| <a class="citerefentry" href="cl_image_format.html"><span class="citerefentry"><span class="refentrytitle">cl_image_format</span></span></a>, |
| <a class="citerefentry" href="classDiagram.html"><span class="citerefentry"><span class="refentrytitle">Cardinality Diagram</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> |
