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| <title>clCreateContextFromType</title> |
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| <meta name="keywords" content="clCreateContextFromType" /> |
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| <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="clCreateContextFromType"></a> |
| <h1> |
| clCreateContextFromType |
| </h1> |
| <p> |
| Create an OpenCL context from a device type that identifies the specific device(s) to use. |
| </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">cl_context</a> |
| |
| <strong class="fsfunc"> |
| clCreateContextFromType |
| </strong> |
| (</code> |
| <td>const <a xmlns="http://www.w3.org/1999/xhtml" class="link" href="enums.html#cl_context_properties" target="_top">cl_context_properties</a> |
| <var xmlns="http://www.w3.org/1999/xhtml" class="pdparam"> *properties</var>, </td> |
| </td> |
| </tr> |
| <tr valign="top"> |
| <td> </td> |
| <td><a xmlns="http://www.w3.org/1999/xhtml" class="link" href="enums.html#cl_device_type" target="_top">cl_device_type</a> |
| <var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">device_type</var>, </td> |
| </tr> |
| <tr valign="top"> |
| <td> </td> |
| <td><a xmlns="http://www.w3.org/1999/xhtml" class="link" href="scalarDataTypes.html" target="_top">void</a> |
| <var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">(CL_CALLBACK *pfn_notify) |
| (const <a class="link" href="scalarDataTypes.html" target="_top">char</a> *errinfo</var>, </td> |
| </tr> |
| <tr valign="top"> |
| <td> </td> |
| <td>const <a xmlns="http://www.w3.org/1999/xhtml" class="link" href="scalarDataTypes.html" target="_top">void</a> |
| <var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">*private_info</var>, </td> |
| </tr> |
| <tr valign="top"> |
| <td> </td> |
| <td><a xmlns="http://www.w3.org/1999/xhtml" class="link" href="scalarDataTypes.html" target="_top">size_t</a> |
| <var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">cb</var>, </td> |
| </tr> |
| <tr valign="top"> |
| <td> </td> |
| <td><a xmlns="http://www.w3.org/1999/xhtml" class="link" href="scalarDataTypes.html" target="_top">void</a> |
| <var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">*user_data)</var>, </td> |
| </tr> |
| <tr valign="top"> |
| <td> </td> |
| <td><a xmlns="http://www.w3.org/1999/xhtml" class="link" href="scalarDataTypes.html" target="_top">void</a> |
| <var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">*user_data</var>, </td> |
| </tr> |
| <tr valign="top"> |
| <td> </td> |
| <td><a xmlns="http://www.w3.org/1999/xhtml" class="link" href="scalarDataTypes.html" target="_top">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">properties</span> |
| </dt> |
| <dd> |
| <p> |
| Specifies a list of context property names and their corresponding values. Each property name is immediately followed by the corresponding desired value. The list is terminated with 0. <code class="varname">properties</code> can be NULL in which case the platform that is selected is implementation-defined. The list of supported properties is described in the table below. |
| </p> |
| <div class="informaltable"> |
| <table border="1"> |
| <colgroup> |
| <col align="left" class="col1" /> |
| <col align="left" class="col2" /> |
| <col align="left" class="col3" /> |
| </colgroup> |
| <thead> |
| <tr> |
| <th align="left">cl_context_properties enum</th> |
| <th align="left">Property value</th> |
| <th align="left">Description</th> |
| </tr> |
| </thead> |
| <tbody> |
| <tr> |
| <td align="left"> |
| <code class="constant">CL_CONTEXT_PLATFORM</code> |
| </td> |
| <td align="left"> |
| <a class="link" href="abstractDataTypes.html" target="_top">cl_platform_id</a> |
| </td> |
| <td align="left">Specifies the platform to use.</td> |
| </tr> |
| <tr> |
| <td align="left"> |
| <code class="constant">CL_CONTEXT_D3D10_DEVICE_KHR</code> |
| </td> |
| <td align="left">ID3D10Device*</td> |
| <td align="left">If the <a class="citerefentry" href="cl_khr_d3d10_sharing.html"><span class="citerefentry"><span class="refentrytitle">cl_khr_d3d10_sharing</span></span></a> |
| extension is enabled, specifies the ID3D10Device* to use for Direct3D 10 interoperability. The default value is NULL.</td> |
| </tr> |
| <tr> |
| <td align="left"> |
| <div class="literallayout"><p><code class="constant">CL_GL_CONTEXT_KHR</code><br /> |
| <code class="constant">CL_EGL_DISPLAY_KHR</code><br /> |
| <code class="constant">CL_GLX_DISPLAY_KHR</code><br /> |
| <code class="constant">CL_WGL_HDC_KHR</code><br /> |
| <code class="constant">CL_CGL_SHAREGROUP_KHR</code></p></div></td> |
| <td align="left"> </td> |
| <td align="left">Available if the <a class="citerefentry" href="cl_khr_gl_sharing.html"><span class="citerefentry"><span class="refentrytitle">cl_khr_gl_sharing</span></span></a> |
| extension is enabled.</td> |
| </tr> |
| </tbody> |
| </table> |
| </div> |
| </dd> |
| <dt> |
| <span class="term">device_type</span> |
| </dt> |
| <dd> |
| <p> |
| A bit-field that identifies the type of device and is described in the table below. |
| </p> |
| <div class="informaltable"> |
| <table border="1"> |
| <colgroup> |
| <col align="left" class="col1" /> |
| <col align="left" class="col2" /> |
| </colgroup> |
| <thead> |
| <tr> |
| <th align="left">cl_device_type</th> |
| <th align="left">Description</th> |
| </tr> |
| </thead> |
| <tbody> |
| <tr> |
| <td align="left"> |
| <code class="constant">CL_DEVICE_TYPE_CPU</code> |
| </td> |
| <td align="left">An OpenCL device that is the host processor. The host |
| processor runs the OpenCL implementations and is a |
| single or multi-core CPU.</td> |
| </tr> |
| <tr> |
| <td align="left"> |
| <code class="constant">CL_DEVICE_TYPE_GPU</code> |
| </td> |
| <td align="left">An OpenCL device that is a GPU. By this we mean that |
| the device can also be used to accelerate a 3D API such |
| as OpenGL or DirectX.</td> |
| </tr> |
| <tr> |
| <td align="left"> |
| <code class="constant">CL_DEVICE_TYPE_ACCELERATOR</code> |
| </td> |
| <td align="left">Dedicated OpenCL accelerators (for example the IBM |
| CELL Blade). These devices communicate with the host |
| processor using a peripheral interconnect such as PCIe.</td> |
| </tr> |
| <tr> |
| <td align="left"> |
| <code class="constant">CL_DEVICE_TYPE_DEFAULT</code> |
| </td> |
| <td align="left">The default OpenCL device in the system.</td> |
| </tr> |
| <tr> |
| <td align="left"> |
| <code class="constant">CL_DEVICE_TYPE_ALL</code> |
| </td> |
| <td align="left">All OpenCL devices available in the system.</td> |
| </tr> |
| </tbody> |
| </table> |
| </div> |
| </dd> |
| <dt> |
| <span class="term"> |
| <code class="varname">pfn_notify</code> |
| </span> |
| </dt> |
| <dd> |
| <p> |
| A callback function that can be registered by the application. This callback function will be used by the OpenCL implementation to report information on errors that occur in this context. This callback function may be called asynchronously by the OpenCL implementation. |
| It is the application's responsibility to ensure that the callback function is thread-safe. If <code class="varname">pfn_notify</code> is NULL, no callback function is registered. The parameters to this callback function are: |
| </p> |
| <p><code class="varname">errinfo</code> is a pointer to an error string.</p> |
| <p><code class="varname">private_info</code> and <code class="varname">cb</code> represent a pointer to binary data that is returned by the OpenCL implementation that can be used to log additional information helpful in debugging the error.</p> |
| <p><code class="varname">user_data</code> is a pointer to user supplied data.</p> |
| <p> |
| There are a number of cases where error notifications need to be delivered due to an error that occurs outside a context. Such notifications may not be delivered through the <code class="varname">pfn_notify</code> callback. Where these notifications go is implementation-defined. |
| </p> |
| </dd> |
| <dt> |
| <span class="term"> |
| <code class="varname">user_data</code> |
| </span> |
| </dt> |
| <dd> |
| <p> |
| Passed as the <code class="varname">user_data</code> argument when <code class="varname">pfn_notify</code> is called. user_data can be NULL. |
| </p> |
| </dd> |
| <dt> |
| <span class="term"> |
| <code class="varname"> |
| errcode_ret |
| </code> |
| </span> |
| </dt> |
| <dd> |
| <p> |
| Return an appropriate error code. If errcode_ret is NULL, no error code is returned. |
| </p> |
| </dd> |
| </dl> |
| </div> |
| </div> |
| <div class="refsect1"> |
| <a id="notes"></a> |
| <h2>Notes</h2> |
| <p> |
| <code class="function">clCreateContextFromType</code> may return all or a subset of the actual physical devices present in the platform and that match <code class="varname">device_type</code>. |
| </p> |
| <p> |
| <code class="function">clCreateContextFromType</code> and <a class="citerefentry" href="clCreateContext.html"><span class="citerefentry"><span class="refentrytitle">clCreateContext</span></span></a> perform an implicit retain. This is very helpful for 3rd party libraries, which typically get a context passed to them by the application. |
| However, it is possible that the application may delete the context without informing the library. |
| Allowing functions to attach to (i.e. retain) and release a context solves the problem of a context |
| being used by a library no longer being valid. |
| </p> |
| </div> |
| <div class="refsect1"> |
| <a id="errors"></a> |
| <h2>Errors</h2> |
| <p> |
| <code class="function">clCreateContextFromType</code> returns a valid non-zero context and <code class="varname">errcode_ret</code> is set |
| to <span class="errorname">CL_SUCCESS</span> if the context is created successfully. Otherwise, it returns a NULL value with the following |
| error vlaues 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_PLATFORM</span> if <code class="varname">properties</code> is NULL and no platform could be selected or |
| if platform value specified in <code class="varname">properties</code> is not a valid platform. (If the extension <a class="citerefentry" href="cl_khr_gl_sharing.html"><span class="citerefentry"><span class="refentrytitle">cl_khr_gl_sharing</span></span></a> is enabled, then see error "CL_INVALID_GL_SHAREGROUP_REFERENCE_KHR" below.) |
| </li> |
| <li class="listitem" style="list-style-type: disc"><span class="errorname">CL_INVALID_PROPERTY</span> if context property name in <code class="varname">properties</code> is not a supported property |
| name, or if the value specified for a supported property name is not valid, or if the same property name is specified more than once. |
| </li> |
| <li class="listitem" style="list-style-type: disc"><span class="errorname">CL_INVALID_VALUE</span> if <code class="varname">pfn_notify</code> is NULL but <code class="varname">user_data</code> is not NULL. |
| </li> |
| <li class="listitem" style="list-style-type: disc"><span class="errorname">CL_INVALID_DEVICE_TYPE</span> if <code class="varname">device_type</code> is not a valid value. |
| </li> |
| <li class="listitem" style="list-style-type: disc"><span class="errorname">CL_INVALID_OPERATION</span> if Direct3D 10 interoperability is specified by setting CL_INVALID_D3D10_DEVICE_KHR |
| to a non-NULL value, and interoperability with another graphics API is also specified (if the |
| <a class="citerefentry" href="cl_khr_d3d10_sharing.html"><span class="citerefentry"><span class="refentrytitle">cl_khr_d3d10_sharing</span></span></a> extension is enabled). |
| </li> |
| <li class="listitem" style="list-style-type: disc"><span class="errorname">CL_DEVICE_NOT_AVAILABLE</span> if no devices that match <code class="varname">device_type</code> and property values |
| specified in <code class="varname">properties</code> are currently available. |
| </li> |
| <li class="listitem" style="list-style-type: disc"><span class="errorname">CL_DEVICE_NOT_FOUND</span> if no devices that match <code class="varname">device_type</code> and property values |
| specified in <code class="varname">properties</code> were found. |
| </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> |
| <li class="listitem" style="list-style-type: disc"><span class="errorname">CL_INVALID_D3D10_DEVICE_KHR</span> if the Direct3D 10 device specified for interoperability is not |
| compatible with the devices against which the context is to be created (if the |
| <a class="citerefentry" href="cl_khr_d3d10_sharing.html"><span class="citerefentry"><span class="refentrytitle">cl_khr_d3d10_sharing</span></span></a> extension is enabled). |
| </li> |
| <li class="listitem" style="list-style-type: disc"><span class="errorname">CL_INVALID_D3D10_DEVICE_KHR</span> if the value of the property CL_CONTEXT_D3D10_DEVICE_KHR is non-NULL |
| and does not specify a valid Direct3D 10 device with which the <code class="varname">cl_device_ids</code> against which this context |
| is to be created may interoperate (if the |
| <a class="citerefentry" href="cl_khr_d3d10_sharing.html"><span class="citerefentry"><span class="refentrytitle">cl_khr_d3d10_sharing</span></span></a> extension is enabled). |
| </li> |
| <li class="listitem" style="list-style-type: disc"><span class="errorname">CL_INVALID_GL_SHAREGROUP_REFERENCE_KHR</span> when an invalid OpenGL context or share group |
| object handle is specified in <code class="varname">properties</code> if the <a class="citerefentry" href="cl_khr_gl_sharing.html"><span class="citerefentry"><span class="refentrytitle">cl_khr_gl_sharing</span></span></a> extension is enabled. |
| </li> |
| <li class="listitem" style="list-style-type: disc"><span class="errorname">CL_INVALID_GL_SHAREGROUP_REFERENCE_KHR</span> if the |
| <a class="citerefentry" href="cl_khr_gl_sharing.html"><span class="citerefentry"><span class="refentrytitle">cl_khr_gl_sharing</span></span></a> extension is enabled and if a context was specified by any of the following means: |
| <div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; "><li class="listitem" style="list-style-type: disc"> |
| Context specified for an EGL-based OpenGL ES or OpenGL implementation by |
| setting the attributes CL_GL_CONTEXT_KHR and CL_EGL_DISPLAY_KHR. |
| </li><li class="listitem" style="list-style-type: disc"> |
| Context was specified for a GLX-based OpenGL implementation by setting the |
| attributes CL_GL_CONTEXT_KHR and CL_GLX_DISPLAY_KHR. |
| </li><li class="listitem" style="list-style-type: disc"> |
| Context was specified for a WGL-based OpenGL implementation by setting the |
| attributes CL_GL_CONTEXT_KHR and CL_WGL_HDC_KHR. |
| </li></ul></div> |
| and any of the following conditions hold: |
| <div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; "><li class="listitem" style="list-style-type: disc"> |
| The specified display and context attributes do not identify a valid OpenGL or |
| OpenGL ES context. |
| </li><li class="listitem" style="list-style-type: disc"> |
| The specified context does not support buffer and renderbuffer objects. |
| </li><li class="listitem" style="list-style-type: disc"> |
| The specified context is not compatible with the OpenCL context being |
| created (for example, it exists in a physically distinct address space, |
| such as another hardware device, or does not support sharing data with OpenCL |
| due to implementation restrictions). |
| </li></ul></div></li> |
| <li class="listitem" style="list-style-type: disc"><span class="errorname">CL_INVALID_GL_SHAREGROUP_REFERENCE_KHR</span> if a share group was specified |
| for a CGL-based OpenGL implementation by setting the attribute CL_CGL_SHAREGROUP_KHR, and the |
| specified share group does not identify a valid CGL share group object (only if the |
| <a class="citerefentry" href="cl_khr_gl_sharing.html"><span class="citerefentry"><span class="refentrytitle">cl_khr_gl_sharing</span></span></a> extension is enabled). |
| </li> |
| </ul> |
| </div> |
| </div> |
| <div class="refsect2"> |
| <a id="example1"></a> |
| <h3> |
| Example |
| </h3> |
| <div class="informaltable"> |
| <table border="0"> |
| <colgroup> |
| <col align="left" class="col1" /> |
| </colgroup> |
| <tbody> |
| <tr> |
| <td align="left">Example goes here - it will be set in "code" type with white space preserved.</td> |
| </tr> |
| </tbody> |
| </table> |
| </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-1.1.pdf#page=47" target="OpenCL Spec">OpenCL Specification</a> |
| </p> |
| </div> |
| <div class="refsect1"> |
| <a id="seealso"></a> |
| <h2>Also see</h2> |
| <p> |
| <a class="citerefentry" href="clCreateContext.html"><span class="citerefentry"><span class="refentrytitle">clCreateContext</span></span></a>, <a class="citerefentry" href="clGetContextInfo.html"><span class="citerefentry"><span class="refentrytitle">clGetContextInfo</span></span></a>, <a class="citerefentry" href="clReleaseContext.html"><span class="citerefentry"><span class="refentrytitle">clReleaseContext</span></span></a>, <a class="citerefentry" href="clRetainContext.html"><span class="citerefentry"><span class="refentrytitle">clRetainContext</span></span></a>, |
| <a class="citerefentry" href="clGetContextInfo.html"><span class="citerefentry"><span class="refentrytitle">clGetContextInfo</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 © 2007-2010 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> |
| </div> |
| </body> |
| </html> |
