Khronos OpenCL™ Registry

The OpenCL registry contains specifications of the core API and the OpenCL C language; a portable intermediate representation of OpenCL programs; specifications of Khronos- and vendor-approved OpenCL extensions; reference pages for different OpenCL versions; and links to header files corresponding to the specifications, which are now hosted in the OpenCL-Headers Github repository.

The OpenCL Standard Portable Intermediate Representation (SPIR) is found in the SPIR Registry.

The SYCL specification is found in the SYCL Registry.

The registry, including published specifications and Docbook XML source for the reference pages, is hosted in the OpenCL-Registry Github repository.

OpenCL Core API and C Language Specification, Headers, and Documentation

The current version of OpenCL is OpenCL 2.2.

The asciidoc source for the OpenCL 2.2 Specifications is available in the KhronosGroup/OpenCL-Docs Github repository.

• OpenCL 2.2 API Specification (PDF) (HTML) (May 12, 2017).
• OpenCL 2.2 Extension Specification (PDF) (HTML) (May 12, 2017).
• OpenCL 2.2 SPIR-V Environment Specification (PDF) (HTML) (May 12, 2017).
• OpenCL C++ Language Specification (PDF) (HTML) (May 12, 2017).
• The OpenCL 2.2 Reference Pages are not posted yet.
• OpenCL 2.2 Reference Guide.
• All of the following headers should be present in a directory CL/ (or OpenCL/ on MacOS X). The single header file opencl.h includes other headers as appropriate for the target platform, and simply including opencl.h should be all that most applications need to do.
  • opencl.h - OpenCL 2.2 Single Header File for Applications.
  • cl_platform.h - OpenCL 2.2 Platform-Dependent Macros.
  • cl.h - OpenCL 2.2 Core API Header File.
  • cl_ext.h - OpenCL 2.2 Extensions Header File.
  • cl_egl.h - OpenCL 2.2 Khronos EGL Extensions Header File.
  • cl_dx9_media_sharing.h - OpenCL 2.2 Khronos OpenCL/Direct3D 9 Media Sharing Extensions Header File.
  • cl_d3d10.h - OpenCL 2.2 Khronos OpenCL/Direct3D 10 Extensions Header File.
  • cl_d3d11.h - OpenCL 2.2 Khronos OpenCL/Direct3D 11 Extensions Header File.
  • cl_gl.h - OpenCL 2.2 Khronos OpenCL/OpenGL Extensions Header File.
  • cl_gl_ext.h - OpenCL 2.2 Vendor OpenCL/OpenGL Extensions Header File.
  • The OpenCL Extended Instruction Set for SPIR-V is included as part of the SPIR-V registry.

  OpenCL ICD and C++ Bindings Headers

  • The OpenCL 2.x C++ Bindings Header File, cl2.hpp can be obtained from the OpenCL-CLHPP Github repository, and Doxygen documentation for the bindings is also available.

  • The OpenCL 1.x C++ Bindings Header File can also be generated from the OpenCL-CLHPP repository, but is not currently packaged as part of the releases built for that repo. A copy of cl.hpp may be downloaded from the registry as well.

  • The original OpenCL 1.2 C++ Binding and OpenCL 1.1 C++ Binding Specifications for the headers are also available.

  • The OpenCL Installable Client Driver (ICD) Loader can be obtained from the OpenCL-ICD-Loader Github repository.

  Older Specifications

  Older versions of OpenCL provided for reference.

  OpenCL 2.1

  • OpenCL 2.1 API Specification (November 11, 2015).
  • OpenCL 2.1 Extensions Specification (November 5, 2015).
  • OpenCL 2.1 Environment Specification.
  • OpenCL 2.1 Reference Pages.
  • OpenCL 2.1 Quick Reference Card.
  • All of the following headers should be present in a directory CL/ (or OpenCL/ on MacOS X). The single header file opencl.h includes other headers as appropriate for the target platform, and simply including opencl.h should be all that most applications need to do.
    • opencl.h - OpenCL 2.1 Single Header File for Applications.
    • cl_platform.h - OpenCL 2.1 Platform-Dependent Macros.
    • cl.h - OpenCL 2.1 Core API Header File.
    • cl_ext.h - OpenCL 2.1 Extensions Header File.
    • cl_egl.h - OpenCL 2.1 Khronos EGL Extensions Header File.
    • cl_dx9_media_sharing.h - OpenCL 2.1 Khronos OpenCL/Direct3D 9 Media Sharing Extensions Header File.
    • cl_d3d10.h - OpenCL 2.1 Khronos OpenCL/Direct3D 10 Extensions Header File.
    • cl_d3d11.h - OpenCL 2.1 Khronos OpenCL/Direct3D 11 Extensions Header File.
    • cl_gl.h - OpenCL 2.1 Khronos OpenCL/OpenGL Extensions Header File.
    • cl_gl_ext.h - OpenCL 2.1 Vendor OpenCL/OpenGL Extensions Header File.

  OpenCL 2.0

  • OpenCL 2.0 API Specification (July 21, 2015).
  • OpenCL 2.0 C Language Specification (April 13, 2016).
  • OpenCL 2.0 Extension Specification (March 11, 2016).
  • OpenCL 2.0 Reference Pages.
  • OpenCL 2.0 Quick Reference Card.
  • OpenCL 2.0 headers are structured in exactly the same fashion as OpenCL 2.0 headers described above.
    • opencl.h - OpenCL 2.0 Single Header File for Applications.
    • cl_platform.h - OpenCL 2.0 Platform-Dependent Macros.
    • cl.h - OpenCL 2.0 Core API Header File.
    • cl_ext.h - OpenCL 2.0 Extensions Header File.
    • cl_egl.h - OpenCL 2.0 Khronos EGL Extensions Header File.
    • cl_dx9_media_sharing.h - OpenCL 2.0 Khronos OpenCL/Direct3D 9 Media Sharing Extensions Header File.
    • cl_d3d10.h - OpenCL 2.0 Khronos OpenCL/Direct3D 10 Extensions Header File.
    • cl_d3d11.h - OpenCL 2.0 Khronos OpenCL/Direct3D 11 Extensions Header File.
    • cl_gl.h - OpenCL 2.0 Khronos OpenCL/OpenGL Extensions Header File.
    • cl_gl_ext.h - OpenCL 2.0 Vendor OpenCL/OpenGL Extensions Header File.

  OpenCL 1.2

  • OpenCL 1.2 API and C Language Specification (November 14, 2012).
  • OpenCL 1.2 Extensions Specification (September 22, 2015).
  • OpenCL 1.2 Reference Pages.
  • OpenCL 1.2 Quick Reference Card.
  • OpenCL 1.2 headers are structured in exactly the same fashion as OpenCL 2.1 headers described above.
    • opencl.h - OpenCL 1.2 Single Header File for Applications.
    • cl_platform.h - OpenCL 1.2 Platform-Dependent Macros.
    • cl.h - OpenCL 1.2 Core API Header File.
    • cl_ext.h - OpenCL 1.2 Extensions Header File.
    • cl_egl.h - OpenCL 1.2 Khronos EGL Extensions Header File.
    • cl_dx9_media_sharing.h - OpenCL 1.2 Khronos OpenCL/Direct3D 9 Media Sharing Extensions Header File.
    • cl_d3d10.h - OpenCL 1.2 Khronos OpenCL/Direct3D 10 Extensions Header File.
    • cl_d3d11.h - OpenCL 1.2 Khronos OpenCL/Direct3D 11 Extensions Header File.
    • cl_gl.h - OpenCL 1.2 Khronos OpenCL/OpenGL Extensions Header File.
    • cl_gl_ext.h - OpenCL 1.2 Vendor OpenCL/OpenGL Extensions Header File.

  OpenCL 1.1

  • OpenCL 1.1 API and C Language Specification (revision 44, June 1, 2011). A Japanese translation of the specification is also available.
  • OpenCL 1.1 Reference Pages.
  • OpenCL 1.1 Reference Card.
  • OpenCL 1.1 headers are structured in exactly the same fashion as OpenCL 2.1 headers described above.
    • opencl.h - OpenCL 1.1 Single Header File for Applications.
    • cl_platform.h - OpenCL 1.1 Platform-Dependent Macros.
    • cl.h - OpenCL 1.1 Core API Header File.
    • cl_ext.h - OpenCL 1.1 Extensions Header File.
    • cl_d3d10.h - OpenCL 1.1 Khronos OpenCL/Direct3D 10 Extensions Header File.
    • cl_gl.h - OpenCL 1.1 Khronos OpenCL/OpenGL Extensions Header File.
    • cl_gl_ext.h - OpenCL 1.1 Vendor OpenCL/OpenGL Extensions Header File.

  OpenCL 1.0

  • OpenCL 1.0 API and C Language Specification (revision 48, October 6, 2009).
  • OpenCL 1.0 Reference Pages.
  • OpenCL 1.0 Reference Card.
  • OpenCL 1.0 headers are structured in exactly the same fashion as OpenCL 2.1 headers described above.
    • opencl.h - OpenCL 1.0 Single Header File for Applications.
    • cl_platform.h - OpenCL 1.0 Platform-Dependent Macros.
    • cl.h - OpenCL 1.0 Core API Header File.
    • cl_ext.h - OpenCL 1.0 Extensions Header File.
    • cl_d3d10.h - OpenCL 1.0 Khronos OpenCL/Direct3D 10 Extensions Header File.
    • cl_gl.h - OpenCL 1.0 Khronos OpenCL/OpenGL Extensions Header File.
    • cl_gl_ext.h - OpenCL 1.0 Vendor OpenCL/OpenGL Extensions Header File.

  Providing Feedback on the Registry

  Khronos welcomes comments and bug reports. To provide feedback on the OpenCL reference pages, or on the OpenCL registry itself (such as reporting missing content, bad links, etc.), file an issue in the OpenCL-Registry Github project.

  Feedback on related OpenCL components can be provided as follows:

  • For the OpenCL API, C/C++ Language, and Environment Specifications, file an issue on the KhronosGroup/OpenCL-Docs Github repository.

  • For the OpenCL C header files, file an issue in the OpenCL-Headers Github project.

  • For the OpenCL C++ Bindings, file an issue in the OpenCL-CLHPP Github project.

  • For the OpenCL ICD Loader, file an issue in the OpenCL-ICD-Loader Github repository.

  Extension Template

  The extension template for writing an OpenCL extension specification shows the structure of vendor extension specifications in the registry (listed below) and serves as a guide for writing new extension specifications. The template describes the purpose of each section in an extension specification.

Enumerant and Extension Number Registry

cl.xml is the registry of reserved OpenCL API enumerant ranges. (Note that following this link will probably not render sensibly in browsers, since the file is not entirely valid XML, simply a manually updated placeholder.)

Extension Specifications

1. cl_khr_gl_sharing
2. cl_nv_d3d9_sharing
3. cl_nv_d3d10_sharing
4. cl_nv_d3d11_sharing
5. cl_khr_icd
6. cl_khr_d3d10_sharing
7. cl_amd_device_attribute_query
8. cl_amd_fp64
9. cl_amd_media_ops
10. cl_ext_migrate_memobject
11. cl_ext_device_fission
12. cl_ext_atomic_counters_32
13. cl_ext_atomic_counters_64
14. cl_intel_dx9_media_sharing
15. cl_amd_media_ops2
16. cl_intel_thread_local_exec
17. cl_nv_compiler_options
18. cl_nv_device_attribute_query
19. cl_nv_pragma_unroll
20. cl_intel_device_partition_by_names
21. cl_qcom_ext_host_ptr
22. cl_qcom_ion_host_ptr
23. cl_intel_motion_estimation
24. cl_intel_accelerator
25. cl_amd_bus_addressable_memory
26. cl_arm_core_id
27. cl_arm_printf
28. cl_altera_live_object_tracking
29. cl_altera_device_temperature
30. cl_altera_compiler_mode
31. cl_intel_d3d11_nv12_media_sharing
32. cl_qcom_android_native_buffer_host_ptr
33. cl_intel_advanced_motion_estimation
34. cl_intel_simultaneous_sharing
35. cl_intel_subgroups
36. cl_intel_va_api_media_sharing
37. cl_intel_egl_image_yuv
38. cl_arm_import_memory
39. cl_arm_non_uniform_work_group_size
40. cl_arm_shared_virtual_memory
41. cl_arm_thread_limit_hint
42. cl_intel_packed_yuv
43. cl_intel_required_subgroup_size
44. cl_img_cached_allocations
45. cl_img_use_gralloc_ptr
46. cl_img_yuv_image
47. cl_intel_driver_diagnostics
48. cl_intel_subgroups_short
49. cl_intel_planar_yuv
50. cl_intel_device_side_avc_motion_estimation
51. cl_intel_media_block_io