Khronos OpenCL Registry

The OpenCL registry contains formatted specifications of the OpenCL API, OpenCL C programming language, OpenCL SPIR-V environment, and OpenCL extensions.

The OpenCL registry also includes header files, links to reference pages, reference cards, and other related documentation.

The asciidoctor source for the specifications in this registry is available in the OpenCL-Docs GitHub repository.

This registry is hosted in the OpenCL-Registry GitHub repository.

OpenCL 3.0 Provisional

The latest provisional version of OpenCL is OpenCL 3.0.

The OpenCL 3.0 Provisional specifications have been ratified under the Khronos Intellectual Property framework and are being made publicly available to enable review and feedback from the community.

To provide feedback, please file an issue on the OpenCL-Docs GitHub repository.

  • OpenCL API Specification (HTML) (PDF) (April 27, 2020).
  • OpenCL Extension Specification (HTML) (PDF) (April 27, 2020.
  • OpenCL SPIR-V Environment Specification (HTML) (PDF) (April 27, 2020).
  • OpenCL C 3.0 Language Specification (HTML) (PDF) (April 27, 2020).
  • OpenCL 3.0 Reference Guide.
OpenCL 2.2

The latest non-provisional version of OpenCL is OpenCL 2.2.

Related Specifications and Resources
Older Specifications

Older versions of OpenCL are provided for reference.

OpenCL 2.1

OpenCL 2.0
OpenCL 1.2
OpenCL 1.1
OpenCL 1.0
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 repository.

Feedback on related OpenCL components can be provided as follows:

  • For the OpenCL API, C/C++ Language, and SPIR-V Environment Specifications, file an issue on the OpenCL-Docs GitHub repository.
  • For the OpenCL C header files, file an issue in the OpenCL-Headers GitHub repository.
  • For the OpenCL C++ bindings, file an issue in the OpenCL-CLHPP GitHub repository.
  • 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
  52. cl_arm_integer_dot_product
  53. cl_qcom_ext_host_ptr_iocoherent
  54. cl_amd_planar_yuv
  55. cl_intel_spirv_subgroups
  56. cl_intel_spirv_media_block_io
  57. cl_intel_spirv_device_side_avc_motion_estimation
  58. cl_arm_job_slot_selection
  59. cl_intel_subgroups_char
  60. cl_intel_subgroups_long
  61. cl_intel_create_buffer_with_properties
  62. cl_intel_mem_channel_property
  63. cl_arm_scheduling_controls
  64. cl_ext_cxx_for_opencl