'\" t .\" Title: clGetDeviceIDsFromD3D11KHR .\" Author: The Khronos Group .\" Generator: DocBook XSL Stylesheets vsnapshot .\" Date: 01/14/2021 .\" Manual: OpenCL Manual .\" Source: The Khronos Group .\" Language: English .\" .TH "CLGETDEVICEIDSFROMD3" "3clc" "01/14/2021" "The Khronos Group" "OpenCL Manual" .\" ----------------------------------------------------------------- .\" * Define some portability stuff .\" ----------------------------------------------------------------- .\" ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ .\" http://bugs.debian.org/507673 .\" http://lists.gnu.org/archive/html/groff/2009-02/msg00013.html .\" ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ .ie \n(.g .ds Aq \(aq .el .ds Aq ' .\" ----------------------------------------------------------------- .\" * set default formatting .\" ----------------------------------------------------------------- .\" disable hyphenation .nh .\" disable justification (adjust text to left margin only) .ad l .\" ----------------------------------------------------------------- .\" * MAIN CONTENT STARTS HERE * .\" ----------------------------------------------------------------- .SH "NAME" clGetDeviceIDsFromD3D11KHR \- Querying OpenCL Devices Corresponding to Direct3D 11 Devices\&. .SH "" .HP \w'cl_int\ clGetDeviceIDsFromD3D11KHR('u .BI "cl_int clGetDeviceIDsFromD3D11KHR(cl_platform_id\ " "platform" ", cl_d3d11_device_source_khr\ " "d3d_device_source" ", void\ *" "d3d_object" ", cl_d3d11_device_set_khr\ " "d3d_device_set" ", cl_uint\ " "num_entries" ", cl_device_id\ *" "devices" ", cl_uint\ *" "num_devices" ");" .SH "PARAMETERS" .PP \fIplatform\fR .RS 4 Refers to the platform ID returned by \fBclGetPlatformIDs\fR(3clc)\&. .RE .PP \fId3d_device_source\fR .RS 4 Specifies the type of \fId3d_object\fR and may be one of the following:\&. .TS allbox tab(:); lB lB. T{ cl_d3d_device_source_khr T}:T{ Type of \fId3d_object\fR T} .T& l l l l. T{ \fBCL_D3D11_DEVICE_KHR\fR T}:T{ ID3D11Device * T} T{ \fBCL_D3D11_DXGI_ADAPTER_KHR\fR T}:T{ IDXGIAdapter * T} .TE .sp 1 .RE .PP \fId3d_object\fR .RS 4 Specifies the object whose corresponding OpenCL devices are being queried\&. The type of \fId3d_object\fR must be as specified in the table above\&. .RE .PP \fId3d_device_set\fR .RS 4 Specifies the set of devices to return, and must be one of the following: .TS allbox tab(:); lB lB. T{ cl_d3d_device_set_khr T}:T{ Devices returned in \fIdevices\fR T} .T& l l l l. T{ \fBCL_PREFERRED_DEVICES_FOR_D3D11_KHR\fR T}:T{ The OpenCL devices associated with the specified Direct3D object\&. T} T{ \fBCL_ALL_DEVICES_FOR_D3D11_KHR\fR T}:T{ All OpenCL devices which may interoperate with the specified Direct3D object\&. Performance of sharing data on these devices may be considerably less than on the preferred devices\&. T} .TE .sp 1 .RE .PP \fInum_entries\fR .RS 4 The number of \fBcl_device_id\fR entries that can be added to \fIdevices\fR\&. If \fIdevices\fR is not NULL, the \fInum_entries\fR must be greater than zero\&. .RE .PP \fIdevices\fR .RS 4 Returns a list of OpenCL devices found\&. The \fBcl_device_id\fR values returned in \fIdevices\fR can be used to identify a specific OpenCL device\&. If \fIdevices\fR is NULL, this argument is ignored\&. The number of OpenCL devices returned is the mininum of the value specified by \fInum_entries\fR and the number of OpenCL devices corresponding to \fId3d_object\fR\&. .RE .PP \fInum_devices\fR .RS 4 Returns the number of OpenCL devices available that correspond to \fId3d_object\fR\&. If \fInum_devices\fR is NULL, this argument is ignored\&. .RE .SH "DESCRIPTION" .PP The OpenCL devices corresponding to a Direct3D 11 device may be queried\&. The OpenCL devices corresponding to a DXGI adapter may also be queried\&. The OpenCL devices corresponding to a Direct3D 11 device will be a subset of the OpenCL devices corresponding to the DXGI adapter against which the Direct3D 11 device was created\&. .SH "NOTES" .PP General information about sharing memory objects with Direct3D 11 follows\&. .PP The goal of this extension is to provide interoperability between OpenCL and Direct3D 11\&. This is designed to function analogously to the OpenGL interoperability\&. If this extension is supported by an implementation, the string \fBcl_khr_d3d11_sharing\fR(3clc) will be present in the \fBCL_PLATFORM_EXTENSIONS\fR or \fBCL_DEVICE_EXTENSIONS\fR string described in the table of allowed values for \fIparam_name\fR for \fBclGetDeviceInfo\fR(3clc)\&. .PP As currently proposed the interfaces for this extension would be provided in cl_d3d11\&.h\&. .PP This section discusses OpenCL functions that allow applications to use Direct3D 11 resources as OpenCL memory objects\&. This allows efficient sharing of data between OpenCL and Direct3D 11\&. The OpenCL API may be used to execute kernels that read and/or write memory objects that are also Direct3D 11 resources\&. An OpenCL image object may be created from a Direct3D 11 texture resource\&. An OpenCL buffer object may be created from a Direct3D 11 buffer resource\&. OpenCL memory objects may be created from Direct3D 11 objects if and only if the OpenCL context has been created from a Direct3D 11 device\&. .PP An OpenCL memory object created from a Direct3D 11 resource remains valid as long as the corresponding Direct3D 11 resource has not been deleted\&. If the Direct3D 11 resource is deleted through the Direct3D 11 API, subsequent use of the OpenCL memory object will result in undefined behavior, including but not limited to possible OpenCL errors, data corruption, and program termination\&. .PP The successful creation of a cl_context against a Direct3D 11 device specified via the context create parameter \fBCL_CONTEXT_D3D11_DEVICE_KHR\fR will increment the internal Direct3D reference count on the specified Direct3D 11 device\&. The internal Direct3D reference count on that Direct3D 11 device will be decremented when the OpenCL reference count on the returned OpenCL context drops to zero\&. .PP The OpenCL context and corresponding command\-queues are dependent on the existence of the Direct3D 11 device from which the OpenCL context was created\&. If the Direct3D 11 device is deleted through the Direct3D 11 API, subsequent use of the OpenCL context will result in undefined behavior, including but not limited to possible OpenCL errors, data corruption, and program termination\&. .PP Properties of Direct3D 11 objects may be queried using \fBclGetMemObjectInfo\fR(3clc) and \fBclGetImageInfo\fR(3clc) with \fIparam_name\fR \fBCL_MEM_D3D11_RESOURCE_KHR\fR and \fBCL_IMAGE_D3D11_SUBRESOURCE_KHR\fR as described for \fBclGetImageInfo\fR(3clc) and in the information below about accessing mapped regions of a memory object\&. Accessing mapped regions of a memory object.PP This section describes the behavior of OpenCL commands that access mapped regions of a memory object\&. .PP The contents of the region of a memory object and associated memory objects (sub\-buffer objects or 1D image buffer objects that overlap this region) mapped for writing (i\&.e\&. \fBCL_MAP_WRITE\fR or \fBCL_MAP_WRITE_INVALIDATE_REGION\fR is set in \fImap_flags\fR argument to \fBclEnqueueMapBuffer\fR(3clc) or \fBclEnqueueMapImage\fR(3clc)) are considered to be undefined until this region is unmapped\&. .PP Multiple commands in command\-queues can map a region or overlapping regions of a memory object and associated memory objects (sub\-buffer objects or 1D image buffer objects that overlap this region) for reading (i\&.e\&. \fImap_flags\fR = \fBCL_MAP_READ\fR)\&. The contents of the regions of a memory object mapped for reading can also be read by kernels and other OpenCL commands (such as \fBclEnqueueCopyBuffer\fR(3clc)) executing on a device(s)\&. .PP Mapping (and unmapping) overlapped regions in a memory object and/or associated memory objects (sub\-buffer objects or 1D image buffer objects that overlap this region) for writing is an error and will result in \fBCL_INVALID_OPERATION\fR error returned by \fBclEnqueueMapBuffer\fR(3clc) or \fBclEnqueueMapImage\fR(3clc)\&. .PP If a memory object is currently mapped for writing, the application must ensure that the memory object is unmapped before any enqueued kernels or commands that read from or write to this memory object or any of its associated memory objects (sub\-buffer or 1D image buffer objects) or its parent object (if the memory object is a sub\-buffer or 1D image buffer object) begin execution; otherwise the behavior is undefined\&. .PP If a memory object is currently mapped for reading, the application must ensure that the memory object is unmapped before any enqueued kernels or commands that write to this memory object or any of its associated memory objects (sub\-buffer or 1D image buffer objects) or its parent object (if the memory object is a sub\-buffer or 1D image buffer object) begin execution; otherwise the behavior is undefined\&. .PP Accessing the contents of the memory region referred to by the mapped pointer that has been unmapped is undefined\&. .PP The mapped pointer returned by \fBclEnqueueMapBuffer\fR(3clc) or \fBclEnqueueMapImage\fR(3clc) can be used as \fIptr\fR argument value to \fBclEnqueueReadBuffer\fR(3clc), \fBclEnqueueWriteBuffer\fR(3clc), \fBclEnqueueReadBufferRect\fR(3clc), \fBclEnqueueWriteBufferRect\fR(3clc), \fBclEnqueueReadImage\fR(3clc), and \fBclEnqueueWriteImage\fR(3clc), provided the rules described above are adhered to\&. .SH "ERRORS" .PP Returns CL_SUCCESS if the function is executed successfully\&. Otherwise it may return: .sp .RS 4 .ie n \{\ \h'-04'\(bu\h'+03'\c .\} .el \{\ .sp -1 .IP \(bu 2.3 .\} CL_INVALID_PLATFORM if \fIplatform\fR is not a valid platform\&. .RE .sp .RS 4 .ie n \{\ \h'-04'\(bu\h'+03'\c .\} .el \{\ .sp -1 .IP \(bu 2.3 .\} CL_INVALID_VALUE if \fId3d_device_source\fR is not a valid value, \fId3d_device_set\fR is not a valid value, \fInum_entries\fR is equal to zero and \fIdevices\fR is not NULL, or if both \fInum_devices\fR and \fIdevices\fR are NULL\&. .RE .sp .RS 4 .ie n \{\ \h'-04'\(bu\h'+03'\c .\} .el \{\ .sp -1 .IP \(bu 2.3 .\} CL_DEVICE_NOT_FOUND if no OpenCL devices that correspond to \fId3d_object\fR were found\&. .RE .SH "SPECIFICATION" .PP \m[blue]\fBOpenCL Specification\fR\m[]\&\s-2\u[1]\d\s+2 .SH "SEE ALSO" .PP \fBcl_khr_d3d11_sharing\fR(3clc), \fBclCreateFromD3D11BufferKHR\fR(3clc), \fBclCreateFromD3D11Texture2DKHR\fR(3clc), \fBclCreateFromD3D11Texture3DKHR\fR(3clc), \fBclEnqueueAcquireD3D11ObjectsKHR\fR(3clc), \fBclEnqueueReleaseD3D11ObjectsKHR\fR(3clc) .SH "AUTHORS" .PP \fBThe Khronos Group\fR .SH "COPYRIGHT" .br Copyright \(co 2007-2011 The Khronos Group Inc. .br 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. .sp .SH "NOTES" .IP " 1." 4 OpenCL Specification .RS 4 \%page 102, section 9.11.7.1 - Querying OpenCL Devices Corresponding to Direct3D .RE