Obtain the list of platforms accessible through the khronos icd loader.
cl_int clIcdGetPlatformIDsKHR(cl_uint num_entries, cl_platform_id *platforms, cl_uint *num_platforms);
num_entries
The number of cl_platform_id entries that can be added to platforms. If platforms is not NULL, then num_entries must be greater than zero.
platforms
Returns a list of OpenCL platforms available for access through the Khronos ICD Loader. The cl_platform_id values returned in platforms are ICD compatible and can be used to identify a specific OpenCL platform. If the platforms argument is NULL, then this argument is ignored. The number of OpenCL platforms returned is the minimum of the value specified by num_entries or the number of OpenCL platforms available.
num_platforms
Returns the number of OpenCL platforms available. If num_platforms is NULL, then this argument is ignored.
This function is enabled by the cl_khr_icd(3clc) extension.
Returns CL_SUCCESS if the function is executed successfully. Otherwise, it returns the following:
CL_PLATFORM_NOT_FOUND_KHR if zero platforms are available.
CL_INVALID_VALUE if num_entries is equal to zero and platforms is not NULL or if both num_platforms and platforms are NULL.
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clGetPlatformIDs(3clc), cl_khr_icd(3clc)
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OpenCL Specification
page 116, section 9.12.9 - Additions to chapter 4...