Obtain the list of platforms available.

cl_int clGetPlatformIDs( cl_uint num_entries,
  cl_platform_id *platforms,
  cl_uint *num_platforms)



The number of cl_platform_id entries that can be added to platforms. If platforms is not NULL, the num_entries must be greater than zero.


Returns a list of OpenCL platforms found. The cl_platform_id values returned in platforms can be used to identify a specific OpenCL platform. If platforms argument is NULL, this argument is ignored. The number of OpenCL platforms returned is the mininum of the value specified by num_entries or the number of OpenCL platforms available.


Returns the number of OpenCL platforms available. If num_platforms is NULL, this argument is ignored.


Returns CL_SUCCESS if the function is executed successfully. If the cl_khr_icd extension is enabled, clGetPlatformIDs returns CL_SUCCESS if the function is executed successfully and there are a non zero number of platforms available.

Otherwise it returns one of the following errors:

  • CL_INVALID_VALUE if num_entries is equal to zero and platforms is not NULL or if both num_platforms and platforms are NULL.
  • CL_OUT_OF_HOST_MEMORY if there is a failure to allocate resources required by the OpenCL implementation on the host.
  • CL_PLATFORM_NOT_FOUND_KHR if the cl_khr_icd extension is enabled and no platforms are found.


OpenCL Specification

Also see

clGetPlatformInfo, clGetDeviceInfo, Cardinality Diagram

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