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<?xml version="1.0" encoding="UTF-8"?>
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<!DOCTYPE book PUBLIC "-//OASIS//DTD DocBook MathML Module V1.1b1//EN"
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"http://www.oasis-open.org/docbook/xml/mathml/1.1CR1/dbmathml.dtd">
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<keywordset><keyword>clCreateContext</keyword></keywordset>
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<refentrytitle>clCreateContext</refentrytitle>
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<year>2007-2011</year>
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<holder>The Khronos Group Inc.
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Permission is hereby granted, free of charge, to any person obtaining a
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copy of this software and/or associated documentation files (the
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"Materials"), to deal in the Materials without restriction, including
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without limitation the rights to use, copy, modify, merge, publish,
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distribute, sublicense, and/or sell copies of the Materials, and to
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permit persons to whom the Materials are furnished to do so, subject to
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the condition that this copyright notice and permission notice shall be included
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in all copies or substantial portions of the Materials.</holder>
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<manvolnum>3</manvolnum>
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<!-- ================================ SYNOPSIS -->
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<refnamediv id="clCreateContext">
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<refname>clCreateContext</refname>
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<refpurpose>Creates an OpenCL context.</refpurpose>
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<refsynopsisdiv xmlns:xlink="http://www.w3.org/1999/xlink"><title></title>
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<funcprototype><funcdef><link xlink:href="abstractDataTypes.html">cl_context</link> <function>clCreateContext</function></funcdef>
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<paramdef>const <link xlink:href="enums.html#cl_context_properties">cl_context_properties</link><parameter>*properties</parameter></paramdef>
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<paramdef><link xlink:href="scalarDataTypes.html">cl_uint</link><parameter>num_devices</parameter></paramdef>
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<paramdef>const <link xlink:href="abstractDataTypes.html">cl_device_id</link><parameter>*devices</parameter></paramdef>
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<paramdef><link xlink:href="scalarDataTypes.html">(void</link> CL_CALLBACK <parameter>*pfn_notify)</parameter>
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<funcparams><literallayout>const <link xlink:href="scalarDataTypes.html">char</link> *errinfo,
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const <link xlink:href="scalarDataTypes.html">void</link> *private_info, <link xlink:href="otherDataTypes.html">size_t</link> cb,
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<link xlink:href="scalarDataTypes.html">void</link> *user_data</literallayout></funcparams></paramdef>
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<paramdef><link xlink:href="scalarDataTypes.html">void</link><parameter>*user_data</parameter></paramdef>
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<paramdef><link xlink:href="scalarDataTypes.html">cl_int</link><parameter>*errcode_ret</parameter></paramdef>
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<!-- ================================ DESCRIPTION -->
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<refsect1 id="description"><title>Description</title>
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An OpenCL context is created with one or more devices. Contexts are used by the
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OpenCL runtime for managing objects such as command-queues, memory, program and kernel
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objects and for executing kernels on one or more devices specified in the context.
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<!-- ================================ PARAMETERS -->
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<refsect1 xmlns:xlink="http://www.w3.org/1999/xlink" id="parameters"><title>Parameters</title>
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<!-- ================================ PARAMETER TABLE (OPTIONAL) -->
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<term>properties</term>
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<!-- core spec pg 54 --> Specifies a list of context property names and
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their corresponding values. Each property name is immediately followed
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by the corresponding desired value. The list is terminated with 0.
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<varname>properties</varname> can be NULL in which case the platform
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that is selected is implementation-defined. The list of supported
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<varname>properties</varname> is described in the table below.
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<!-- ext. spec p. 85, section 9.10.5; and
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ext. spec p. 99, section 9.11.5 --> If the extension
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<citerefentry><refentrytitle>cl_khr_dx9_media_sharing</refentrytitle></citerefentry>
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is enabled, then <varname>properties</varname> specifies a list of context
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property names and their corresponding values. Each property is followed
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immediately by the corresponding desired value. The list is terminated with
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zero. If a property is not specified in <varname>properties</varname>, then its
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default value (listed in the table below) is used (it is said to be specified
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implicitly). If <varname>properties</varname> is NULL or empty (points to
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a list whose first value is zero), all attributes take on their default values.
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<para><!-- ext spec. p. 68, section 9.9.5 -->
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<citerefentry><refentrytitle>cl_khr_d3d10_sharing</refentrytitle></citerefentry>
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is enabled, then <varname>properties</varname> specifies a list of context
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property names and their corresponding values. Each property is followed
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immediately by the corresponding desired value. The list is terminated
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with zero. if a property is not specified in <varname>properties</varname>,
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then its default value is used (it is said to be specified implicitly). If
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<varname>properties</varname> is NULL or empty (points to a list whose first
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value is zero), all attributes take on their default value.
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<citerefentry><refentrytitle>cl_khr_gl_sharing</refentrytitle></citerefentry>
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is enabled, then <varname>properties</varname> points to an attribute list,
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which is a array of ordered <attribute name, value> pairs terminated with
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zero. If an attribute is not specified in <varname>properties</varname>,
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then its default value is used (it is said to be specified implicitly). If
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<varname>properties</varname> is NULL or empty (points to a list whose first
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value is zero), all attributes take on their default values..
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<informaltable frame="all">
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<tgroup cols="3" align="left" colsep="1" rowsep="1">
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<colspec colname="col1" colnum="1" />
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<colspec colname="col2" colnum="2" />
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<colspec colname="col3" colnum="3" />
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<entry>cl_context_properties enum</entry>
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<entry>Property value</entry>
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<entry>Description</entry>
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<entry><constant>CL_CONTEXT_PLATFORM</constant></entry>
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<entry><link xlink:href="abstractDataTypes.html">cl_platform_id</link></entry>
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<entry>Specifies the platform to use.</entry>
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<entry><constant>CL_CONTEXT_INTEROP_USER_SYNC</constant></entry>
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<entry><link xlink:href="enums.html#cl_bool">cl_bool</link></entry>
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Specifies whether the user is responsible for synchronization between OpenCL
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and other APIs. Please refer to the specific sections in the OpenCL 1.2 extension specification
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that describe sharing with other APIs for restrictions on using this flag.
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If <constant>CL_CONTEXT_INTEROP_USER_</constant> SYNC is not
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specified, a default of <constant>CL_FALSE</constant> is assumed.
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<entry><constant>CL_CONTEXT_D3D10_DEVICE_KHR</constant></entry>
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<entry>ID3D10Device*</entry>
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<citerefentry><refentrytitle>cl_khr_d3d10_sharing</refentrytitle></citerefentry>
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extension is enabled, specifies the <type>ID3D10Device</type>*
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to use for Direct3D 10 interoperability. The default value is NULL.
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<row><!-- ext. spec p. 39, section 9.6.3 -->
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<entry><constant>CL_GL_CONTEXT_KHR</constant></entry>
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<entry>0, OpenGL context handle</entry>
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OpenGL context to associated
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the OpenCL context with (available if the
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<citerefentry><refentrytitle>cl_khr_gl_sharing</refentrytitle></citerefentry>
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extension is enabled)
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<row><!-- ext. spec p. 39-40, section 9.6.3 -->
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<entry><constant>CL_EGL_DISPLAY_KHR</constant></entry>
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<entry> <constant>EGL_NO_DISPLAY</constant>, <type>EGLDisplay</type> handle </entry>
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EGLDisplay an OpenGL context was
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created with respect to (available if the
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<citerefentry><refentrytitle>cl_khr_gl_sharing</refentrytitle></citerefentry>
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extension is enabled)
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<row><!-- ext. spec p. 39-40, section 9.6.3 -->
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<entry><constant>CL_GLX_DISPLAY_KHR</constant></entry>
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<entry>None, X handle</entry>
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X Display an OpenGL context was
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created with respect to (available if the
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<citerefentry><refentrytitle>cl_khr_gl_sharing</refentrytitle></citerefentry>
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extension is enabled)
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<row><!-- ext. spec pp. 39-41, section 9.6.3 -->
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<entry><constant>CL_CGL_SHAREGROUP_KHR</constant></entry>
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<entry>0, CGL share group handle</entry>
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CGL share group to associate the OpenCL context with (available if the
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<citerefentry><refentrytitle>cl_khr_gl_sharing</refentrytitle></citerefentry>
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extension is enabled)
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<row><!-- ext. spec pp. 39-40, section 9.6.3 -->
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<entry><constant>CL_WGL_HDC_KHR</constant></entry>
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<entry>0, HDC handle</entry>
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HDC an OpenGL context was created with respect to (available if the
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<citerefentry><refentrytitle>cl_khr_gl_sharing</refentrytitle></citerefentry>
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extension is enabled)
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<row><!-- ext. spec p. 84, section 9.10.4; and p. 86, section 9.10.5 -->
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<entry><constant>CL_CONTEXT_ADAPTER_D3D9_KHR</constant></entry>
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<entry>IDirect3DDevice9 *</entry>
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Specifies an <type>IDirect3DDevice9</type>
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to use for D3D9 interop (if the
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<citerefentry><refentrytitle>cl_khr_dx9_media_sharing</refentrytitle></citerefentry>
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extension is supported).
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<row><!-- ext. spec p. 84, section 9.10.4; and p. 86, section 9.10.5 -->
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<entry><constant>CL_CONTEXT_ADAPTER_D3D9EX_KHR</constant></entry>
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<entry>IDirect3DDeviceEx*</entry>
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Specifies an <type>IDirect3DDevice9Ex</type>
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to use for D3D9 interop (if the
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<citerefentry><refentrytitle>cl_khr_dx9_media_sharing</refentrytitle></citerefentry>
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extension is supported).
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<row><!-- ext. spec p. 84, section 9.10.4; and p. 86, section 9.10.5 -->
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<entry><constant>CL_CONTEXT_ADAPTER_DXVA_KHR</constant></entry>
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<entry>IDXVAHD_Device *</entry>
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Specifies an <type>IDXVAHD_Device</type>
243
to use for DXVA interop (if the
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<citerefentry><refentrytitle>cl_khr_dx9_media_sharing</refentrytitle></citerefentry>
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extension is supported).
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<row><!-- ext. spec p. 98, section 9.11.4; and p. 99, section 9.11.5 -->
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<entry><constant>CL_CONTEXT_D3D11_DEVICE_KHR</constant></entry>
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<entry>ID3D11Device *</entry>
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Specifies the <type>ID3D11Device</type> * to use for Direct3D 11
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interoperability. The default value is NULL.
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<!-- ================================ END PARAMETER TABLE -->
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<term><varname>num_devices</varname></term>
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The number of devices specified in the <varname>devices</varname> argument.
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<term><varname>devices</varname></term>
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A pointer to a list of unique devices returned by
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<citerefentry><refentrytitle>clGetDeviceIDs</refentrytitle></citerefentry>
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or sub-devices created by
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<citerefentry><refentrytitle>clCreateSubDevices</refentrytitle></citerefentry>
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<term><varname>pfn_notify</varname></term>
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A callback function that can be registered by the application. This callback
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function will be used by the OpenCL implementation to report information
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on errors during context creation as well as errors that occur at runtime
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in this context. This callback function may be called asynchronously by
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the OpenCL implementation. It is the application's responsibility to ensure
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that the callback function is thread-safe. If <varname>pfn_notify</varname>
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is NULL, no callback function is registered. The parameters to this callback
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<para><varname>errinfo</varname> is a pointer to an error string.</para>
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<varname>private_info</varname> and <varname>cb</varname> represent a pointer
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to binary data that is returned by the OpenCL implementation that can be used
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to log additional information helpful in debugging the error.
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<para><varname>user_data</varname> is a pointer to user supplied data.</para>
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NOTE: There are a number of cases where error notifications need to be
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delivered due to an error that occurs outside a context. Such notifications
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may not be delivered through the <varname>pfn_notify</varname> callback. Where
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these notifications go is implementation-defined.
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<term><varname>user_data</varname></term>
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Passed as the <varname>user_data</varname> argument when
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<varname>pfn_notify</varname> is called. <varname>user_data</varname> can
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<term><varname>errcode_ret</varname></term>
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Returns an appropriate error code. If <varname>errcode_ret</varname> is NULL,
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no error code is returned.
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<!-- ================================ NOTES -->
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<refsect1 id="notes"><title>Notes</title>
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<function>clCreateContext</function> and
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<citerefentry><refentrytitle>clCreateContextFromType</refentrytitle></citerefentry>
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perform an implicit retain. This is very helpful for 3rd party libraries, which
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typically get a context passed to them by the application. However, it is possible
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that the application may delete the context without informing the library. Allowing
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functions to attach to (i.e. retain) and release a context solves the problem of a
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context being used by a library no longer being valid.
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<!-- ================================ ERRORS -->
360
<refsect1 id="errors"><title>Errors</title>
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<function>clCreateContext</function> returns a valid non-zero context and
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<varname>errcode_ret</varname> is set to <errorname>CL_SUCCESS</errorname> if the
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context is created successfully. Otherwise, it returns NULL value with the following
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error values returned in <varname>errcode_ret</varname>:
368
<itemizedlist mark="disc">
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<errorname>CL_INVALID_PLATFORM</errorname> if <varname>properties</varname>
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is NULL and no platform could be selected or if platform value specified
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in <varname>properties</varname> is not a valid platform. (If the extension
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<citerefentry><refentrytitle>cl_khr_gl_sharing</refentrytitle></citerefentry>
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is enabled, then this error is replaced with
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<constant>CL_INVALID_GL_SHAREGROUP_REFERENCE_KHR</constant>; see below.)
378
<listitem><!-- core spec p. 55, section 4.4; and ext spec p. 42, section 9.6.4 -->
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<errorname>CL_INVALID_PROPERTY</errorname> if context property name in
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<varname>properties</varname> is not a supported property name, if the
381
value specified for a supported property name is not valid, or if the
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same property name is specified more than once. However if the extension
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<citerefentry><refentrytitle>cl_khr_gl_sharing</refentrytitle></citerefentry> is
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enabled, then <constant>CL_INVALID_PROPERTY</constant> is returned if an attribute
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name other than those listed in the table for <varname>properties</varname>
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above or if <constant>CL_CONTEXT_INTEROP_USER_SYNC</constant> is specified in
387
<varname>properties</varname>.
390
<listitem><!-- ext spec p. 42, section 9.6.4 -->
391
<errorname>CL_INVALID_PROPERTY</errorname> if an attribute name other than those
392
specified in table 4.5 or if <constant>CL_CONTEXT_INTEROP_USER_SYNC</constant> is
393
specified in properties.
397
<errorname>CL_INVALID_VALUE</errorname> if <varname>devices</varname> is NULL; if
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<varname>num_devices</varname> is equal to zero; or if <varname>pfn_notify</varname>
399
is NULL but <varname>user_data</varname> is not NULL.
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<errorname>CL_INVALID_DEVICE</errorname> if <varname>devices</varname> contains an invalid device.
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<errorname>CL_INVALID_OPERATION</errorname> if Direct3D 10 interoperability is
408
specified by setting <constant>CL_INVALID_D3D10_DEVICE_KHR</constant> to a non-NULL
409
value, and interoperability with another graphics API is also specified (if the
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<citerefentry><refentrytitle>cl_khr_d3d10_sharing</refentrytitle></citerefentry>
411
extension is enabled).
415
<errorname>CL_DEVICE_NOT_AVAILABLE</errorname> if a device in <varname>devices</varname>
416
is currently not available even though the device was returned by
417
<citerefentry><refentrytitle>clGetDeviceIDs</refentrytitle></citerefentry>.
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<errorname>CL_OUT_OF_RESOURCES</errorname> if there is a failure to allocate resources
422
required by the OpenCL implementation on the device.
426
<errorname>CL_OUT_OF_HOST_MEMORY</errorname> if there is a failure to allocate
427
resources required by the OpenCL implementation on the host.
431
<errorname>CL_INVALID_D3D10_DEVICE_KHR</errorname> if the Direct3D
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10 device specified for interoperability is not compatible with
433
the devices against which the context is to be created (if the
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<citerefentry><refentrytitle>cl_khr_d3d10_sharing</refentrytitle></citerefentry>
435
extension is enabled).
439
<errorname>CL_INVALID_D3D10_DEVICE_KHR</errorname> if the value of the property
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<constant>CL_CONTEXT_D3D10_DEVICE_KHR</constant> is non-NULL and does not specify
441
a valid Direct3D 10 device with which the <varname>cl_device_ids</varname>
442
against which this context is to be created may interoperate (if the
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<citerefentry><refentrytitle>cl_khr_d3d10_sharing</refentrytitle></citerefentry>
444
extension is enabled).
447
<listitem><!-- ext. spec p. 39, section 9.6.3 -->
448
<errorname>CL_INVALID_GL_SHAREGROUP_REFERENCE_KHR</errorname> when an invalid OpenGL
449
context or share group object handle is specified in <varname>properties</varname> (only
450
if the <citerefentry><refentrytitle>cl_khr_gl_sharing</refentrytitle></citerefentry>
451
extension is enabled).
455
<!-- ext spec. p. 40, section 9.6.4 -->
456
<errorname>CL_INVALID_GL_SHAREGROUP_REFERENCE_KHR</errorname> if no OpenGL or
457
OpenGL ES context or share group is specified in the attribute list given to
458
<citerefentry><refentrytitle>clCreateContext</refentrytitle></citerefentry>
459
and any of the commands in section 9.7 are called. (if the
460
<citerefentry><refentrytitle>cl_khr_gl_sharing</refentrytitle></citerefentry> extension
464
<listitem><!-- ext spec. p. 41, section 9.6.4 -->
465
<errorname>CL_INVALID_GL_SHAREGROUP_REFERENCE_KHR</errorname> if the
466
<citerefentry><refentrytitle>cl_khr_gl_sharing</refentrytitle></citerefentry>
467
extension is enabled and if a context was specified by any of the following means:
469
<itemizedlist mark="disc">
471
A context specified for an EGL-based OpenGL ES or OpenGL implementation
472
by setting the attributes <constant>CL_GL_CONTEXT_KHR</constant> and
473
<constant>CL_EGL_DISPLAY_KHR</constant>.
477
A context was specified for a GLX-based OpenGL implementation by
478
setting the attributes <constant>CL_GL_CONTEXT_KHR</constant> and
479
<constant>CL_GLX_DISPLAY_KHR</constant>.
483
A context was specified for a WGL-based OpenGL implementation by
484
setting the attributes <constant>CL_GL_CONTEXT_KHR</constant> and
485
<constant>CL_WGL_HDC_KHR</constant>.
489
and any of the following conditions hold:
491
<itemizedlist mark="disc">
493
The specified display and context attributes do not identify a valid
494
OpenGL or OpenGL ES context.
498
The specified context does not support buffer and renderbuffer objects.
502
The specified context is not compatible with the OpenCL context being
503
created (for example, it exists in a physically distinct address space,
504
such as another hardware device, or does not support sharing data with
505
OpenCL due to implementation restrictions).
510
<listitem><!-- ext. spec p. 42, section 9.6.4 -->
511
<errorname>CL_INVALID_GL_SHAREGROUP_REFERENCE_KHR</errorname> if a
512
share group was specified for a CGL-based OpenGL implementation by
513
setting the attribute <constant>CL_CGL_SHAREGROUP_KHR</constant>, and the
514
specified share group does not identify a valid CGL share group object (if the
515
<citerefentry><refentrytitle>cl_khr_gl_sharing</refentrytitle></citerefentry> extension
520
<errorname>CL_INVALID_OPERATION</errorname> if a context was specified as described above
521
and any of the following conditions hold:
523
<itemizedlist mark="disc">
525
A context or share group object was specified for one of CGL, EGL, GLX, or WGL
526
and the OpenGL implementation does not support that window-system binding API.
530
More than one of the attributes <constant>CL_CGL_SHAREGROUP_KHR</constant>,
531
<constant>CL_EGL_DISPLAY_KHR</constant>, <constant>CL_GLX_DISPLAY_KHR</constant>,
532
and <constant>CL_WGL_HDC_KHR</constant> is set to a non-default value.
536
Both of the attributes <constant>CL_CGL_SHAREGROUP_KHR</constant> and
537
<constant>CL_GL_CONTEXT_KHR</constant> are set to non-default values.
541
Any of the devices specified in the devices argument cannot support OpenCL
542
objects which share the data store of an OpenGL object, as described in
549
<errorname>CL_INVALID_DX9_MEDIA_ADAPTER_KHR</errorname> if the
550
media adapter specified for interoperability is not compatible with
551
the devices against which the context is to be created (only if the
552
<citerefentry><refentrytitle>cl_khr_dx9_media_sharing</refentrytitle></citerefentry>
553
extension is supported).
557
<!-- ext. spec p. 86, section 9.10.5 --> <errorname>CL_INVALID_ADAPTER_KHR</errorname> if
558
any of the values of the properties <constant>CL_CONTEXT_ADAPTER_D3D9_KHR</constant>,
559
<constant>CL_CONTEXT_ADAPTER_D3D9EX_KHR</constant> or
560
<constant>CL_CONTEXT_ADAPTER_DXVA_KHR</constant> is non-NULL and
561
does not specify a valid media adapter with which the cl_device_ids
562
against which this context is to be created may interoperate (only if the
563
<citerefentry><refentrytitle>cl_khr_dx9_media_sharing</refentrytitle></citerefentry>
564
extension is supported).
568
<!-- ext. spec p. 86, section 9.10.5 -->
569
<errorname>CL_INVALID_OPERATION</errorname> if interoperability is
570
specified by setting <constant>CL_CONTEXT_ADAPTER_D3D9_KHR</constant>,
571
<constant>CL_CONTEXT_ADAPTER_D3D9EX_KHR</constant> or
572
<constant>CL_CONTEXT_ADAPTER_DXVA_KHR</constant> to a non-NULL value, and
573
interoperability with another graphics API is also specified (only if the
574
<citerefentry><refentrytitle>cl_khr_dx9_media_sharing</refentrytitle></citerefentry>
575
extension is supported).
579
<!-- ext. spec p. 100, section 9.11.5 --> <errorname>CL_INVALID_OPERATION</errorname>
580
if Direct3D 11 interoperability is specified by setting
581
<constant>CL_INVALID_D3D11_DEVICE_KHR</constant> to a non-NULL value, and
582
interoperability with another graphics API is also specified (only if the
583
<citerefentry><refentrytitle>cl_khr_d3d11_sharing</refentrytitle></citerefentry>
584
extension is supported).
588
<!-- ext. spec p. 99, section 9.11.4; and p. 100, section 9.11.5 -->
589
<errorname>CL_INVALID_D3D11_DEVICE_KHR</errorname> if the value of the property
590
<constant>CL_CONTEXT_D3D11_DEVICE_KHR</constant> is non-NULL and does not specify
591
a valid Direct3D 11 device with which the <varname>cl_device_ids</varname>
592
against which this context is to be created may interoperate (only if the
593
<citerefentry><refentrytitle>cl_khr_d3d11_sharing</refentrytitle></citerefentry>
594
extension is supported).
598
<!-- ext. spec p. 99, section 9.11.4 -->
599
<errorname>CL_INVALID_D3D11_DEVICE_KHR</errorname> if the Direct3D
600
11 device specified for interoperability is not compatible with
601
the devices against which the context is to be created (only if the
602
<citerefentry><refentrytitle>cl_khr_d3d11_sharing</refentrytitle></citerefentry>
603
extension is supported).
609
<!-- ================================ EXAMPLE -->
610
<!-- DO NOT DELETE IN CASE AN EXAMPLE IS ADDED IN THE FUTURE
612
<refsect2 id="example1"><title>Example</title>
613
<informaltable frame="none"><tgroup cols="1" align="left" colsep="0" rowsep="0">
614
<colspec colname="col1" colnum="1" /><tbody><row>
616
cl_context <function>clCreateContext</function>
617
<olink uri="enums.html#cl_context_properties">cl_context_properties</olink> <varname>*properties</varname>
618
cl_uint <varname>num_devices</varname>
619
const cl_device_id <varname>*devices</varname>
620
void <varname>*pfn_notify</varname> (
621
const char <varname>*errinfo</varname>,
622
const void <varname>*private_info</varname>,
623
size_t <varname>cb</varname>,
624
void <varname>*user_data</varname>),
625
void <varname>*user_data</varname>,
626
cl_int <varname>*errcode_ret</varname>)
628
</tbody></tgroup></informaltable>
632
<!-- ================================ SPECIFICATION -->
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<refsect1 id="specification"><title>Specification</title>
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<olink uri="clCreateContext">OpenCL Specification</olink>
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<!-- ================================ ALSO SEE -->
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<refsect1 id="seealso"><title>Also see</title>
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<citerefentry><refentrytitle>clGetDeviceIDs</refentrytitle></citerefentry>,
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<citerefentry><refentrytitle>clCreateContextFromType</refentrytitle></citerefentry>,
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<citerefentry><refentrytitle>clRetainContext</refentrytitle></citerefentry>,
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<citerefentry><refentrytitle>clReleaseContext</refentrytitle></citerefentry>,
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<citerefentry><refentrytitle>clGetContextInfo</refentrytitle></citerefentry>,
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<citerefentry href="classDiagram"><refentrytitle>Cardinality Diagram</refentrytitle></citerefentry>
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<!-- ============================== COPYRIGHT -->
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<refsect3 id="Copyright"><title></title>
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clCreateContext.xml
